SAFE public projects git trees. - safe/jmp/linux-2.6/blob - arch/sparc/mm/sun4c.c

   1 /* sun4c.c: Doing in software what should be done in hardware.
   2  *
   3  * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
   4  * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
   5  * Copyright (C) 1996 Andrew Tridgell (Andrew.Tridgell@anu.edu.au)
   6  * Copyright (C) 1997-2000 Anton Blanchard (anton@samba.org)
   7  * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   8  */
   9
  10 #define NR_TASK_BUCKETS 512
  11
  12 #include <linux/kernel.h>
  13 #include <linux/mm.h>
  14 #include <linux/init.h>
  15 #include <linux/bootmem.h>
  16 #include <linux/highmem.h>
  17 #include <linux/fs.h>
  18 #include <linux/seq_file.h>
  19 #include <linux/scatterlist.h>
  20 #include <linux/bitmap.h>
  21
  22 #include <asm/sections.h>
  23 #include <asm/page.h>
  24 #include <asm/pgalloc.h>
  25 #include <asm/pgtable.h>
  26 #include <asm/vaddrs.h>
  27 #include <asm/idprom.h>
  28 #include <asm/machines.h>
  29 #include <asm/memreg.h>
  30 #include <asm/processor.h>
  31 #include <asm/auxio.h>
  32 #include <asm/io.h>
  33 #include <asm/oplib.h>
  34 #include <asm/openprom.h>
  35 #include <asm/mmu_context.h>
  36 #include <asm/highmem.h>
  37 #include <asm/btfixup.h>
  38 #include <asm/cacheflush.h>
  39 #include <asm/tlbflush.h>
  40
  41 /* Because of our dynamic kernel TLB miss strategy, and how
  42  * our DVMA mapping allocation works, you _MUST_:
  43  *
  44  * 1) Disable interrupts _and_ not touch any dynamic kernel
  45  *    memory while messing with kernel MMU state.  By
  46  *    dynamic memory I mean any object which is not in
  47  *    the kernel image itself or a thread_union (both of
  48  *    which are locked into the MMU).
  49  * 2) Disable interrupts while messing with user MMU state.
  50  */
  51
  52 extern int num_segmaps, num_contexts;
  53
  54 extern unsigned long page_kernel;
  55
  56 /* That's it, we prom_halt() on sun4c if the cache size is something other than 65536.
  57  * So let's save some cycles and just use that everywhere except for that bootup
  58  * sanity check.
  59  */
  60 #define SUN4C_VAC_SIZE 65536
  61
  62 #define SUN4C_KERNEL_BUCKETS 32
  63
  64 /* Flushing the cache. */
  65 struct sun4c_vac_props sun4c_vacinfo;
  66 unsigned long sun4c_kernel_faults;
  67
  68 /* Invalidate every sun4c cache line tag. */
  69 static void __init sun4c_flush_all(void)
  70 {
  71         unsigned long begin, end;
  72
  73         if (sun4c_vacinfo.on)
  74                 panic("SUN4C: AIEEE, trying to invalidate vac while it is on.");
  75
  76         /* Clear 'valid' bit in all cache line tags */
  77         begin = AC_CACHETAGS;
  78         end = (AC_CACHETAGS + SUN4C_VAC_SIZE);
  79         while (begin < end) {
  80                 __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
  81                                      "r" (begin), "i" (ASI_CONTROL));
  82                 begin += sun4c_vacinfo.linesize;
  83         }
  84 }
  85
  86 static void sun4c_flush_context_hw(void)
  87 {
  88         unsigned long end = SUN4C_VAC_SIZE;
  89
  90         __asm__ __volatile__(
  91                 "1:     addcc   %0, -4096, %0\n\t"
  92                 "       bne     1b\n\t"
  93                 "        sta    %%g0, [%0] %2"
  94         : "=&r" (end)
  95         : "0" (end), "i" (ASI_HWFLUSHCONTEXT)
  96         : "cc");
  97 }
  98
  99 /* Must be called minimally with IRQs disabled. */
 100 static void sun4c_flush_segment_hw(unsigned long addr)
 101 {
 102         if (sun4c_get_segmap(addr) != invalid_segment) {
 103                 unsigned long vac_size = SUN4C_VAC_SIZE;
 104
 105                 __asm__ __volatile__(
 106                         "1:     addcc   %0, -4096, %0\n\t"
 107                         "       bne     1b\n\t"
 108                         "        sta    %%g0, [%2 + %0] %3"
 109                         : "=&r" (vac_size)
 110                         : "0" (vac_size), "r" (addr), "i" (ASI_HWFLUSHSEG)
 111                         : "cc");
 112         }
 113 }
 114
 115 /* File local boot time fixups. */
 116 BTFIXUPDEF_CALL(void, sun4c_flush_page, unsigned long)
 117 BTFIXUPDEF_CALL(void, sun4c_flush_segment, unsigned long)
 118 BTFIXUPDEF_CALL(void, sun4c_flush_context, void)
 119
 120 #define sun4c_flush_page(addr) BTFIXUP_CALL(sun4c_flush_page)(addr)
 121 #define sun4c_flush_segment(addr) BTFIXUP_CALL(sun4c_flush_segment)(addr)
 122 #define sun4c_flush_context() BTFIXUP_CALL(sun4c_flush_context)()
 123
 124 /* Must be called minimally with interrupts disabled. */
 125 static void sun4c_flush_page_hw(unsigned long addr)
 126 {
 127         addr &= PAGE_MASK;
 128         if ((int)sun4c_get_pte(addr) < 0)
 129                 __asm__ __volatile__("sta %%g0, [%0] %1"
 130                                      : : "r" (addr), "i" (ASI_HWFLUSHPAGE));
 131 }
 132
 133 /* Don't inline the software version as it eats too many cache lines if expanded. */
 134 static void sun4c_flush_context_sw(void)
 135 {
 136         unsigned long nbytes = SUN4C_VAC_SIZE;
 137         unsigned long lsize = sun4c_vacinfo.linesize;
 138
 139         __asm__ __volatile__(
 140         "add    %2, %2, %%g1\n\t"
 141         "add    %2, %%g1, %%g2\n\t"
 142         "add    %2, %%g2, %%g3\n\t"
 143         "add    %2, %%g3, %%g4\n\t"
 144         "add    %2, %%g4, %%g5\n\t"
 145         "add    %2, %%g5, %%o4\n\t"
 146         "add    %2, %%o4, %%o5\n"
 147         "1:\n\t"
 148         "subcc  %0, %%o5, %0\n\t"
 149         "sta    %%g0, [%0] %3\n\t"
 150         "sta    %%g0, [%0 + %2] %3\n\t"
 151         "sta    %%g0, [%0 + %%g1] %3\n\t"
 152         "sta    %%g0, [%0 + %%g2] %3\n\t"
 153         "sta    %%g0, [%0 + %%g3] %3\n\t"
 154         "sta    %%g0, [%0 + %%g4] %3\n\t"
 155         "sta    %%g0, [%0 + %%g5] %3\n\t"
 156         "bg     1b\n\t"
 157         " sta   %%g0, [%1 + %%o4] %3\n"
 158         : "=&r" (nbytes)
 159         : "0" (nbytes), "r" (lsize), "i" (ASI_FLUSHCTX)
 160         : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
 161 }
 162
 163 /* Don't inline the software version as it eats too many cache lines if expanded. */
 164 static void sun4c_flush_segment_sw(unsigned long addr)
 165 {
 166         if (sun4c_get_segmap(addr) != invalid_segment) {
 167                 unsigned long nbytes = SUN4C_VAC_SIZE;
 168                 unsigned long lsize = sun4c_vacinfo.linesize;
 169
 170                 __asm__ __volatile__(
 171                 "add    %2, %2, %%g1\n\t"
 172                 "add    %2, %%g1, %%g2\n\t"
 173                 "add    %2, %%g2, %%g3\n\t"
 174                 "add    %2, %%g3, %%g4\n\t"
 175                 "add    %2, %%g4, %%g5\n\t"
 176                 "add    %2, %%g5, %%o4\n\t"
 177                 "add    %2, %%o4, %%o5\n"
 178                 "1:\n\t"
 179                 "subcc  %1, %%o5, %1\n\t"
 180                 "sta    %%g0, [%0] %6\n\t"
 181                 "sta    %%g0, [%0 + %2] %6\n\t"
 182                 "sta    %%g0, [%0 + %%g1] %6\n\t"
 183                 "sta    %%g0, [%0 + %%g2] %6\n\t"
 184                 "sta    %%g0, [%0 + %%g3] %6\n\t"
 185                 "sta    %%g0, [%0 + %%g4] %6\n\t"
 186                 "sta    %%g0, [%0 + %%g5] %6\n\t"
 187                 "sta    %%g0, [%0 + %%o4] %6\n\t"
 188                 "bg     1b\n\t"
 189                 " add   %0, %%o5, %0\n"
 190                 : "=&r" (addr), "=&r" (nbytes), "=&r" (lsize)
 191                 : "0" (addr), "1" (nbytes), "2" (lsize),
 192                   "i" (ASI_FLUSHSEG)
 193                 : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
 194         }
 195 }
 196
 197 /* Don't inline the software version as it eats too many cache lines if expanded. */
 198 static void sun4c_flush_page_sw(unsigned long addr)
 199 {
 200         addr &= PAGE_MASK;
 201         if ((sun4c_get_pte(addr) & (_SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_VALID)) ==
 202             _SUN4C_PAGE_VALID) {
 203                 unsigned long left = PAGE_SIZE;
 204                 unsigned long lsize = sun4c_vacinfo.linesize;
 205
 206                 __asm__ __volatile__(
 207                 "add    %2, %2, %%g1\n\t"
 208                 "add    %2, %%g1, %%g2\n\t"
 209                 "add    %2, %%g2, %%g3\n\t"
 210                 "add    %2, %%g3, %%g4\n\t"
 211                 "add    %2, %%g4, %%g5\n\t"
 212                 "add    %2, %%g5, %%o4\n\t"
 213                 "add    %2, %%o4, %%o5\n"
 214                 "1:\n\t"
 215                 "subcc  %1, %%o5, %1\n\t"
 216                 "sta    %%g0, [%0] %6\n\t"
 217                 "sta    %%g0, [%0 + %2] %6\n\t"
 218                 "sta    %%g0, [%0 + %%g1] %6\n\t"
 219                 "sta    %%g0, [%0 + %%g2] %6\n\t"
 220                 "sta    %%g0, [%0 + %%g3] %6\n\t"
 221                 "sta    %%g0, [%0 + %%g4] %6\n\t"
 222                 "sta    %%g0, [%0 + %%g5] %6\n\t"
 223                 "sta    %%g0, [%0 + %%o4] %6\n\t"
 224                 "bg     1b\n\t"
 225                 " add   %0, %%o5, %0\n"
 226                 : "=&r" (addr), "=&r" (left), "=&r" (lsize)
 227                 : "0" (addr), "1" (left), "2" (lsize),
 228                   "i" (ASI_FLUSHPG)
 229                 : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
 230         }
 231 }
 232
 233 /* The sun4c's do have an on chip store buffer.  And the way you
 234  * clear them out isn't so obvious.  The only way I can think of
 235  * to accomplish this is to read the current context register,
 236  * store the same value there, then read an external hardware
 237  * register.
 238  */
 239 void sun4c_complete_all_stores(void)
 240 {
 241         volatile int _unused;
 242
 243         _unused = sun4c_get_context();
 244         sun4c_set_context(_unused);
 245         _unused = get_auxio();
 246 }
 247
 248 /* Bootup utility functions. */
 249 static inline void sun4c_init_clean_segmap(unsigned char pseg)
 250 {
 251         unsigned long vaddr;
 252
 253         sun4c_put_segmap(0, pseg);
 254         for (vaddr = 0; vaddr < SUN4C_REAL_PGDIR_SIZE; vaddr += PAGE_SIZE)
 255                 sun4c_put_pte(vaddr, 0);
 256         sun4c_put_segmap(0, invalid_segment);
 257 }
 258
 259 static inline void sun4c_init_clean_mmu(unsigned long kernel_end)
 260 {
 261         unsigned long vaddr;
 262         unsigned char savectx, ctx;
 263
 264         savectx = sun4c_get_context();
 265         for (ctx = 0; ctx < num_contexts; ctx++) {
 266                 sun4c_set_context(ctx);
 267                 for (vaddr = 0; vaddr < 0x20000000; vaddr += SUN4C_REAL_PGDIR_SIZE)
 268                         sun4c_put_segmap(vaddr, invalid_segment);
 269                 for (vaddr = 0xe0000000; vaddr < KERNBASE; vaddr += SUN4C_REAL_PGDIR_SIZE)
 270                         sun4c_put_segmap(vaddr, invalid_segment);
 271                 for (vaddr = kernel_end; vaddr < KADB_DEBUGGER_BEGVM; vaddr += SUN4C_REAL_PGDIR_SIZE)
 272                         sun4c_put_segmap(vaddr, invalid_segment);
 273                 for (vaddr = LINUX_OPPROM_ENDVM; vaddr; vaddr += SUN4C_REAL_PGDIR_SIZE)
 274                         sun4c_put_segmap(vaddr, invalid_segment);
 275         }
 276         sun4c_set_context(savectx);
 277 }
 278
 279 void __init sun4c_probe_vac(void)
 280 {
 281         sun4c_disable_vac();
 282
 283         if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) ||
 284             (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) {
 285                 /* PROM on SS1 lacks this info, to be super safe we
 286                  * hard code it here since this arch is cast in stone.
 287                  */
 288                 sun4c_vacinfo.num_bytes = 65536;
 289                 sun4c_vacinfo.linesize = 16;
 290         } else {
 291                 sun4c_vacinfo.num_bytes =
 292                  prom_getintdefault(prom_root_node, "vac-size", 65536);
 293                 sun4c_vacinfo.linesize =
 294                  prom_getintdefault(prom_root_node, "vac-linesize", 16);
 295         }
 296         sun4c_vacinfo.do_hwflushes =
 297          prom_getintdefault(prom_root_node, "vac-hwflush", 0);
 298
 299         if (sun4c_vacinfo.do_hwflushes == 0)
 300                 sun4c_vacinfo.do_hwflushes =
 301                  prom_getintdefault(prom_root_node, "vac_hwflush", 0);
 302
 303         if (sun4c_vacinfo.num_bytes != 65536) {
 304                 prom_printf("WEIRD Sun4C VAC cache size, "
 305                             "tell sparclinux@vger.kernel.org");
 306                 prom_halt();
 307         }
 308
 309         switch (sun4c_vacinfo.linesize) {
 310         case 16:
 311                 sun4c_vacinfo.log2lsize = 4;
 312                 break;
 313         case 32:
 314                 sun4c_vacinfo.log2lsize = 5;
 315                 break;
 316         default:
 317                 prom_printf("probe_vac: Didn't expect vac-linesize of %d, halting\n",
 318                             sun4c_vacinfo.linesize);
 319                 prom_halt();
 320         };
 321
 322         sun4c_flush_all();
 323         sun4c_enable_vac();
 324 }
 325
 326 /* Patch instructions for the low level kernel fault handler. */
 327 extern unsigned long invalid_segment_patch1, invalid_segment_patch1_ff;
 328 extern unsigned long invalid_segment_patch2, invalid_segment_patch2_ff;
 329 extern unsigned long invalid_segment_patch1_1ff, invalid_segment_patch2_1ff;
 330 extern unsigned long num_context_patch1, num_context_patch1_16;
 331 extern unsigned long num_context_patch2_16;
 332 extern unsigned long vac_linesize_patch, vac_linesize_patch_32;
 333 extern unsigned long vac_hwflush_patch1, vac_hwflush_patch1_on;
 334 extern unsigned long vac_hwflush_patch2, vac_hwflush_patch2_on;
 335
 336 #define PATCH_INSN(src, dst) do {       \
 337                 daddr = &(dst);         \
 338                 iaddr = &(src);         \
 339                 *daddr = *iaddr;        \
 340         } while (0)
 341
 342 static void __init patch_kernel_fault_handler(void)
 343 {
 344         unsigned long *iaddr, *daddr;
 345
 346         switch (num_segmaps) {
 347                 case 128:
 348                         /* Default, nothing to do. */
 349                         break;
 350                 case 256:
 351                         PATCH_INSN(invalid_segment_patch1_ff,
 352                                    invalid_segment_patch1);
 353                         PATCH_INSN(invalid_segment_patch2_ff,
 354                                    invalid_segment_patch2);
 355                         break;
 356                 case 512:
 357                         PATCH_INSN(invalid_segment_patch1_1ff,
 358                                    invalid_segment_patch1);
 359                         PATCH_INSN(invalid_segment_patch2_1ff,
 360                                    invalid_segment_patch2);
 361                         break;
 362                 default:
 363                         prom_printf("Unhandled number of segmaps: %d\n",
 364                                     num_segmaps);
 365                         prom_halt();
 366         };
 367         switch (num_contexts) {
 368                 case 8:
 369                         /* Default, nothing to do. */
 370                         break;
 371                 case 16:
 372                         PATCH_INSN(num_context_patch1_16,
 373                                    num_context_patch1);
 374                         break;
 375                 default:
 376                         prom_printf("Unhandled number of contexts: %d\n",
 377                                     num_contexts);
 378                         prom_halt();
 379         };
 380
 381         if (sun4c_vacinfo.do_hwflushes != 0) {
 382                 PATCH_INSN(vac_hwflush_patch1_on, vac_hwflush_patch1);
 383                 PATCH_INSN(vac_hwflush_patch2_on, vac_hwflush_patch2);
 384         } else {
 385                 switch (sun4c_vacinfo.linesize) {
 386                 case 16:
 387                         /* Default, nothing to do. */
 388                         break;
 389                 case 32:
 390                         PATCH_INSN(vac_linesize_patch_32, vac_linesize_patch);
 391                         break;
 392                 default:
 393                         prom_printf("Impossible VAC linesize %d, halting...\n",
 394                                     sun4c_vacinfo.linesize);
 395                         prom_halt();
 396                 };
 397         }
 398 }
 399
 400 static void __init sun4c_probe_mmu(void)
 401 {
 402         if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) ||
 403             (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) {
 404                 /* Hardcode these just to be safe, PROM on SS1 does
 405                 * not have this info available in the root node.
 406                 */
 407                 num_segmaps = 128;
 408                 num_contexts = 8;
 409         } else {
 410                 num_segmaps =
 411                     prom_getintdefault(prom_root_node, "mmu-npmg", 128);
 412                 num_contexts =
 413                     prom_getintdefault(prom_root_node, "mmu-nctx", 0x8);
 414         }
 415         patch_kernel_fault_handler();
 416 }
 417
 418 volatile unsigned long __iomem *sun4c_memerr_reg = NULL;
 419
 420 void __init sun4c_probe_memerr_reg(void)
 421 {
 422         int node;
 423         struct linux_prom_registers regs[1];
 424
 425         node = prom_getchild(prom_root_node);
 426         node = prom_searchsiblings(prom_root_node, "memory-error");
 427         if (!node)
 428                 return;
 429         if (prom_getproperty(node, "reg", (char *)regs, sizeof(regs)) <= 0)
 430                 return;
 431         /* hmm I think regs[0].which_io is zero here anyways */
 432         sun4c_memerr_reg = ioremap(regs[0].phys_addr, regs[0].reg_size);
 433 }
 434
 435 static inline void sun4c_init_ss2_cache_bug(void)
 436 {
 437         extern unsigned long start;
 438
 439         if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS2)) ||
 440             (idprom->id_machtype == (SM_SUN4C | SM_4C_IPX)) ||
 441             (idprom->id_machtype == (SM_SUN4C | SM_4C_ELC))) {
 442                 /* Whee.. */
 443                 printk("SS2 cache bug detected, uncaching trap table page\n");
 444                 sun4c_flush_page((unsigned int) &start);
 445                 sun4c_put_pte(((unsigned long) &start),
 446                         (sun4c_get_pte((unsigned long) &start) | _SUN4C_PAGE_NOCACHE));
 447         }
 448 }
 449
 450 /* Addr is always aligned on a page boundary for us already. */
 451 static int sun4c_map_dma_area(struct device *dev, dma_addr_t *pba, unsigned long va,
 452                               unsigned long addr, int len)
 453 {
 454         unsigned long page, end;
 455
 456         *pba = addr;
 457
 458         end = PAGE_ALIGN((addr + len));
 459         while (addr < end) {
 460                 page = va;
 461                 sun4c_flush_page(page);
 462                 page -= PAGE_OFFSET;
 463                 page >>= PAGE_SHIFT;
 464                 page |= (_SUN4C_PAGE_VALID | _SUN4C_PAGE_DIRTY |
 465                          _SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_PRIV);
 466                 sun4c_put_pte(addr, page);
 467                 addr += PAGE_SIZE;
 468                 va += PAGE_SIZE;
 469         }
 470
 471         return 0;
 472 }
 473
 474 static void sun4c_unmap_dma_area(struct device *dev, unsigned long busa, int len)
 475 {
 476         /* Fortunately for us, bus_addr == uncached_virt in sun4c. */
 477         /* XXX Implement this */
 478 }
 479
 480 /* TLB management. */
 481
 482 /* Don't change this struct without changing entry.S. This is used
 483  * in the in-window kernel fault handler, and you don't want to mess
 484  * with that. (See sun4c_fault in entry.S).
 485  */
 486 struct sun4c_mmu_entry {
 487         struct sun4c_mmu_entry *next;
 488         struct sun4c_mmu_entry *prev;
 489         unsigned long vaddr;
 490         unsigned char pseg;
 491         unsigned char locked;
 492
 493         /* For user mappings only, and completely hidden from kernel
 494          * TLB miss code.
 495          */
 496         unsigned char ctx;
 497         struct sun4c_mmu_entry *lru_next;
 498         struct sun4c_mmu_entry *lru_prev;
 499 };
 500
 501 static struct sun4c_mmu_entry mmu_entry_pool[SUN4C_MAX_SEGMAPS];
 502
 503 static void __init sun4c_init_mmu_entry_pool(void)
 504 {
 505         int i;
 506
 507         for (i=0; i < SUN4C_MAX_SEGMAPS; i++) {
 508                 mmu_entry_pool[i].pseg = i;
 509                 mmu_entry_pool[i].next = NULL;
 510                 mmu_entry_pool[i].prev = NULL;
 511                 mmu_entry_pool[i].vaddr = 0;
 512                 mmu_entry_pool[i].locked = 0;
 513                 mmu_entry_pool[i].ctx = 0;
 514                 mmu_entry_pool[i].lru_next = NULL;
 515                 mmu_entry_pool[i].lru_prev = NULL;
 516         }
 517         mmu_entry_pool[invalid_segment].locked = 1;
 518 }
 519
 520 static inline void fix_permissions(unsigned long vaddr, unsigned long bits_on,
 521                                    unsigned long bits_off)
 522 {
 523         unsigned long start, end;
 524
 525         end = vaddr + SUN4C_REAL_PGDIR_SIZE;
 526         for (start = vaddr; start < end; start += PAGE_SIZE)
 527                 if (sun4c_get_pte(start) & _SUN4C_PAGE_VALID)
 528                         sun4c_put_pte(start, (sun4c_get_pte(start) | bits_on) &
 529                                       ~bits_off);
 530 }
 531
 532 static inline void sun4c_init_map_kernelprom(unsigned long kernel_end)
 533 {
 534         unsigned long vaddr;
 535         unsigned char pseg, ctx;
 536
 537         for (vaddr = KADB_DEBUGGER_BEGVM;
 538              vaddr < LINUX_OPPROM_ENDVM;
 539              vaddr += SUN4C_REAL_PGDIR_SIZE) {
 540                 pseg = sun4c_get_segmap(vaddr);
 541                 if (pseg != invalid_segment) {
 542                         mmu_entry_pool[pseg].locked = 1;
 543                         for (ctx = 0; ctx < num_contexts; ctx++)
 544                                 prom_putsegment(ctx, vaddr, pseg);
 545                         fix_permissions(vaddr, _SUN4C_PAGE_PRIV, 0);
 546                 }
 547         }
 548
 549         for (vaddr = KERNBASE; vaddr < kernel_end; vaddr += SUN4C_REAL_PGDIR_SIZE) {
 550                 pseg = sun4c_get_segmap(vaddr);
 551                 mmu_entry_pool[pseg].locked = 1;
 552                 for (ctx = 0; ctx < num_contexts; ctx++)
 553                         prom_putsegment(ctx, vaddr, pseg);
 554                 fix_permissions(vaddr, _SUN4C_PAGE_PRIV, _SUN4C_PAGE_NOCACHE);
 555         }
 556 }
 557
 558 static void __init sun4c_init_lock_area(unsigned long start, unsigned long end)
 559 {
 560         int i, ctx;
 561
 562         while (start < end) {
 563                 for (i = 0; i < invalid_segment; i++)
 564                         if (!mmu_entry_pool[i].locked)
 565                                 break;
 566                 mmu_entry_pool[i].locked = 1;
 567                 sun4c_init_clean_segmap(i);
 568                 for (ctx = 0; ctx < num_contexts; ctx++)
 569                         prom_putsegment(ctx, start, mmu_entry_pool[i].pseg);
 570                 start += SUN4C_REAL_PGDIR_SIZE;
 571         }
 572 }
 573
 574 /* Don't change this struct without changing entry.S. This is used
 575  * in the in-window kernel fault handler, and you don't want to mess
 576  * with that. (See sun4c_fault in entry.S).
 577  */
 578 struct sun4c_mmu_ring {
 579         struct sun4c_mmu_entry ringhd;
 580         int num_entries;
 581 };
 582
 583 static struct sun4c_mmu_ring sun4c_context_ring[SUN4C_MAX_CONTEXTS]; /* used user entries */
 584 static struct sun4c_mmu_ring sun4c_ufree_ring;       /* free user entries */
 585 static struct sun4c_mmu_ring sun4c_ulru_ring;        /* LRU user entries */
 586 struct sun4c_mmu_ring sun4c_kernel_ring;      /* used kernel entries */
 587 struct sun4c_mmu_ring sun4c_kfree_ring;       /* free kernel entries */
 588
 589 static inline void sun4c_init_rings(void)
 590 {
 591         int i;
 592
 593         for (i = 0; i < SUN4C_MAX_CONTEXTS; i++) {
 594                 sun4c_context_ring[i].ringhd.next =
 595                         sun4c_context_ring[i].ringhd.prev =
 596                         &sun4c_context_ring[i].ringhd;
 597                 sun4c_context_ring[i].num_entries = 0;
 598         }
 599         sun4c_ufree_ring.ringhd.next = sun4c_ufree_ring.ringhd.prev =
 600                 &sun4c_ufree_ring.ringhd;
 601         sun4c_ufree_ring.num_entries = 0;
 602         sun4c_ulru_ring.ringhd.lru_next = sun4c_ulru_ring.ringhd.lru_prev =
 603                 &sun4c_ulru_ring.ringhd;
 604         sun4c_ulru_ring.num_entries = 0;
 605         sun4c_kernel_ring.ringhd.next = sun4c_kernel_ring.ringhd.prev =
 606                 &sun4c_kernel_ring.ringhd;
 607         sun4c_kernel_ring.num_entries = 0;
 608         sun4c_kfree_ring.ringhd.next = sun4c_kfree_ring.ringhd.prev =
 609                 &sun4c_kfree_ring.ringhd;
 610         sun4c_kfree_ring.num_entries = 0;
 611 }
 612
 613 static void add_ring(struct sun4c_mmu_ring *ring,
 614                      struct sun4c_mmu_entry *entry)
 615 {
 616         struct sun4c_mmu_entry *head = &ring->ringhd;
 617
 618         entry->prev = head;
 619         (entry->next = head->next)->prev = entry;
 620         head->next = entry;
 621         ring->num_entries++;
 622 }
 623
 624 static inline void add_lru(struct sun4c_mmu_entry *entry)
 625 {
 626         struct sun4c_mmu_ring *ring = &sun4c_ulru_ring;
 627         struct sun4c_mmu_entry *head = &ring->ringhd;
 628
 629         entry->lru_next = head;
 630         (entry->lru_prev = head->lru_prev)->lru_next = entry;
 631         head->lru_prev = entry;
 632 }
 633
 634 static void add_ring_ordered(struct sun4c_mmu_ring *ring,
 635                              struct sun4c_mmu_entry *entry)
 636 {
 637         struct sun4c_mmu_entry *head = &ring->ringhd;
 638         unsigned long addr = entry->vaddr;
 639
 640         while ((head->next != &ring->ringhd) && (head->next->vaddr < addr))
 641                 head = head->next;
 642
 643         entry->prev = head;
 644         (entry->next = head->next)->prev = entry;
 645         head->next = entry;
 646         ring->num_entries++;
 647
 648         add_lru(entry);
 649 }
 650
 651 static inline void remove_ring(struct sun4c_mmu_ring *ring,
 652                                    struct sun4c_mmu_entry *entry)
 653 {
 654         struct sun4c_mmu_entry *next = entry->next;
 655
 656         (next->prev = entry->prev)->next = next;
 657         ring->num_entries--;
 658 }
 659
 660 static void remove_lru(struct sun4c_mmu_entry *entry)
 661 {
 662         struct sun4c_mmu_entry *next = entry->lru_next;
 663
 664         (next->lru_prev = entry->lru_prev)->lru_next = next;
 665 }
 666
 667 static void free_user_entry(int ctx, struct sun4c_mmu_entry *entry)
 668 {
 669         remove_ring(sun4c_context_ring+ctx, entry);
 670         remove_lru(entry);
 671         add_ring(&sun4c_ufree_ring, entry);
 672 }
 673
 674 static void free_kernel_entry(struct sun4c_mmu_entry *entry,
 675                               struct sun4c_mmu_ring *ring)
 676 {
 677         remove_ring(ring, entry);
 678         add_ring(&sun4c_kfree_ring, entry);
 679 }
 680
 681 static void __init sun4c_init_fill_kernel_ring(int howmany)
 682 {
 683         int i;
 684
 685         while (howmany) {
 686                 for (i = 0; i < invalid_segment; i++)
 687                         if (!mmu_entry_pool[i].locked)
 688                                 break;
 689                 mmu_entry_pool[i].locked = 1;
 690                 sun4c_init_clean_segmap(i);
 691                 add_ring(&sun4c_kfree_ring, &mmu_entry_pool[i]);
 692                 howmany--;
 693         }
 694 }
 695
 696 static void __init sun4c_init_fill_user_ring(void)
 697 {
 698         int i;
 699
 700         for (i = 0; i < invalid_segment; i++) {
 701                 if (mmu_entry_pool[i].locked)
 702                         continue;
 703                 sun4c_init_clean_segmap(i);
 704                 add_ring(&sun4c_ufree_ring, &mmu_entry_pool[i]);
 705         }
 706 }
 707
 708 static void sun4c_kernel_unmap(struct sun4c_mmu_entry *kentry)
 709 {
 710         int savectx, ctx;
 711
 712         savectx = sun4c_get_context();
 713         for (ctx = 0; ctx < num_contexts; ctx++) {
 714                 sun4c_set_context(ctx);
 715                 sun4c_put_segmap(kentry->vaddr, invalid_segment);
 716         }
 717         sun4c_set_context(savectx);
 718 }
 719
 720 static void sun4c_kernel_map(struct sun4c_mmu_entry *kentry)
 721 {
 722         int savectx, ctx;
 723
 724         savectx = sun4c_get_context();
 725         for (ctx = 0; ctx < num_contexts; ctx++) {
 726                 sun4c_set_context(ctx);
 727                 sun4c_put_segmap(kentry->vaddr, kentry->pseg);
 728         }
 729         sun4c_set_context(savectx);
 730 }
 731
 732 #define sun4c_user_unmap(__entry) \
 733         sun4c_put_segmap((__entry)->vaddr, invalid_segment)
 734
 735 static void sun4c_demap_context(struct sun4c_mmu_ring *crp, unsigned char ctx)
 736 {
 737         struct sun4c_mmu_entry *head = &crp->ringhd;
 738         unsigned long flags;
 739
 740         local_irq_save(flags);
 741         if (head->next != head) {
 742                 struct sun4c_mmu_entry *entry = head->next;
 743                 int savectx = sun4c_get_context();
 744
 745                 flush_user_windows();
 746                 sun4c_set_context(ctx);
 747                 sun4c_flush_context();
 748                 do {
 749                         struct sun4c_mmu_entry *next = entry->next;
 750
 751                         sun4c_user_unmap(entry);
 752                         free_user_entry(ctx, entry);
 753
 754                         entry = next;
 755                 } while (entry != head);
 756                 sun4c_set_context(savectx);
 757         }
 758         local_irq_restore(flags);
 759 }
 760
 761 static int sun4c_user_taken_entries;  /* This is how much we have.             */
 762 static int max_user_taken_entries;    /* This limits us and prevents deadlock. */
 763
 764 static struct sun4c_mmu_entry *sun4c_kernel_strategy(void)
 765 {
 766         struct sun4c_mmu_entry *this_entry;
 767
 768         /* If some are free, return first one. */
 769         if (sun4c_kfree_ring.num_entries) {
 770                 this_entry = sun4c_kfree_ring.ringhd.next;
 771                 return this_entry;
 772         }
 773
 774         /* Else free one up. */
 775         this_entry = sun4c_kernel_ring.ringhd.prev;
 776         sun4c_flush_segment(this_entry->vaddr);
 777         sun4c_kernel_unmap(this_entry);
 778         free_kernel_entry(this_entry, &sun4c_kernel_ring);
 779         this_entry = sun4c_kfree_ring.ringhd.next;
 780
 781         return this_entry;
 782 }
 783
 784 /* Using this method to free up mmu entries eliminates a lot of
 785  * potential races since we have a kernel that incurs tlb
 786  * replacement faults.  There may be performance penalties.
 787  *
 788  * NOTE: Must be called with interrupts disabled.
 789  */
 790 static struct sun4c_mmu_entry *sun4c_user_strategy(void)
 791 {
 792         struct sun4c_mmu_entry *entry;
 793         unsigned char ctx;
 794         int savectx;
 795
 796         /* If some are free, return first one. */
 797         if (sun4c_ufree_ring.num_entries) {
 798                 entry = sun4c_ufree_ring.ringhd.next;
 799                 goto unlink_out;
 800         }
 801
 802         if (sun4c_user_taken_entries) {
 803                 entry = sun4c_kernel_strategy();
 804                 sun4c_user_taken_entries--;
 805                 goto kunlink_out;
 806         }
 807
 808         /* Grab from the beginning of the LRU list. */
 809         entry = sun4c_ulru_ring.ringhd.lru_next;
 810         ctx = entry->ctx;
 811
 812         savectx = sun4c_get_context();
 813         flush_user_windows();
 814         sun4c_set_context(ctx);
 815         sun4c_flush_segment(entry->vaddr);
 816         sun4c_user_unmap(entry);
 817         remove_ring(sun4c_context_ring + ctx, entry);
 818         remove_lru(entry);
 819         sun4c_set_context(savectx);
 820
 821         return entry;
 822
 823 unlink_out:
 824         remove_ring(&sun4c_ufree_ring, entry);
 825         return entry;
 826 kunlink_out:
 827         remove_ring(&sun4c_kfree_ring, entry);
 828         return entry;
 829 }
 830
 831 /* NOTE: Must be called with interrupts disabled. */
 832 void sun4c_grow_kernel_ring(void)
 833 {
 834         struct sun4c_mmu_entry *entry;
 835
 836         /* Prevent deadlock condition. */
 837         if (sun4c_user_taken_entries >= max_user_taken_entries)
 838                 return;
 839
 840         if (sun4c_ufree_ring.num_entries) {
 841                 entry = sun4c_ufree_ring.ringhd.next;
 842                 remove_ring(&sun4c_ufree_ring, entry);
 843                 add_ring(&sun4c_kfree_ring, entry);
 844                 sun4c_user_taken_entries++;
 845         }
 846 }
 847
 848 /* 2 page buckets for task struct and kernel stack allocation.
 849  *
 850  * TASK_STACK_BEGIN
 851  * bucket[0]
 852  * bucket[1]
 853  *   [ ... ]
 854  * bucket[NR_TASK_BUCKETS-1]
 855  * TASK_STACK_BEGIN + (sizeof(struct task_bucket) * NR_TASK_BUCKETS)
 856  *
 857  * Each slot looks like:
 858  *
 859  *  page 1 --  task struct + beginning of kernel stack
 860  *  page 2 --  rest of kernel stack
 861  */
 862
 863 union task_union *sun4c_bucket[NR_TASK_BUCKETS];
 864
 865 static int sun4c_lowbucket_avail;
 866
 867 #define BUCKET_EMPTY     ((union task_union *) 0)
 868 #define BUCKET_SHIFT     (PAGE_SHIFT + 1)        /* log2(sizeof(struct task_bucket)) */
 869 #define BUCKET_SIZE      (1 << BUCKET_SHIFT)
 870 #define BUCKET_NUM(addr) ((((addr) - SUN4C_LOCK_VADDR) >> BUCKET_SHIFT))
 871 #define BUCKET_ADDR(num) (((num) << BUCKET_SHIFT) + SUN4C_LOCK_VADDR)
 872 #define BUCKET_PTE(page)       \
 873         ((((page) - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(SUN4C_PAGE_KERNEL))
 874 #define BUCKET_PTE_PAGE(pte)   \
 875         (PAGE_OFFSET + (((pte) & SUN4C_PFN_MASK) << PAGE_SHIFT))
 876
 877 static void get_locked_segment(unsigned long addr)
 878 {
 879         struct sun4c_mmu_entry *stolen;
 880         unsigned long flags;
 881
 882         local_irq_save(flags);
 883         addr &= SUN4C_REAL_PGDIR_MASK;
 884         stolen = sun4c_user_strategy();
 885         max_user_taken_entries--;
 886         stolen->vaddr = addr;
 887         flush_user_windows();
 888         sun4c_kernel_map(stolen);
 889         local_irq_restore(flags);
 890 }
 891
 892 static void free_locked_segment(unsigned long addr)
 893 {
 894         struct sun4c_mmu_entry *entry;
 895         unsigned long flags;
 896         unsigned char pseg;
 897
 898         local_irq_save(flags);
 899         addr &= SUN4C_REAL_PGDIR_MASK;
 900         pseg = sun4c_get_segmap(addr);
 901         entry = &mmu_entry_pool[pseg];
 902
 903         flush_user_windows();
 904         sun4c_flush_segment(addr);
 905         sun4c_kernel_unmap(entry);
 906         add_ring(&sun4c_ufree_ring, entry);
 907         max_user_taken_entries++;
 908         local_irq_restore(flags);
 909 }
 910
 911 static inline void garbage_collect(int entry)
 912 {
 913         int start, end;
 914
 915         /* 32 buckets per segment... */
 916         entry &= ~31;
 917         start = entry;
 918         for (end = (start + 32); start < end; start++)
 919                 if (sun4c_bucket[start] != BUCKET_EMPTY)
 920                         return;
 921
 922         /* Entire segment empty, release it. */
 923         free_locked_segment(BUCKET_ADDR(entry));
 924 }
 925
 926 static struct thread_info *sun4c_alloc_thread_info(void)
 927 {
 928         unsigned long addr, pages;
 929         int entry;
 930
 931         pages = __get_free_pages(GFP_KERNEL, THREAD_INFO_ORDER);
 932         if (!pages)
 933                 return NULL;
 934
 935         for (entry = sun4c_lowbucket_avail; entry < NR_TASK_BUCKETS; entry++)
 936                 if (sun4c_bucket[entry] == BUCKET_EMPTY)
 937                         break;
 938         if (entry == NR_TASK_BUCKETS) {
 939                 free_pages(pages, THREAD_INFO_ORDER);
 940                 return NULL;
 941         }
 942         if (entry >= sun4c_lowbucket_avail)
 943                 sun4c_lowbucket_avail = entry + 1;
 944
 945         addr = BUCKET_ADDR(entry);
 946         sun4c_bucket[entry] = (union task_union *) addr;
 947         if(sun4c_get_segmap(addr) == invalid_segment)
 948                 get_locked_segment(addr);
 949
 950         /* We are changing the virtual color of the page(s)
 951          * so we must flush the cache to guarantee consistency.
 952          */
 953         sun4c_flush_page(pages);
 954         sun4c_flush_page(pages + PAGE_SIZE);
 955
 956         sun4c_put_pte(addr, BUCKET_PTE(pages));
 957         sun4c_put_pte(addr + PAGE_SIZE, BUCKET_PTE(pages + PAGE_SIZE));
 958
 959 #ifdef CONFIG_DEBUG_STACK_USAGE
 960         memset((void *)addr, 0, PAGE_SIZE << THREAD_INFO_ORDER);
 961 #endif /* DEBUG_STACK_USAGE */
 962
 963         return (struct thread_info *) addr;
 964 }
 965
 966 static void sun4c_free_thread_info(struct thread_info *ti)
 967 {
 968         unsigned long tiaddr = (unsigned long) ti;
 969         unsigned long pages = BUCKET_PTE_PAGE(sun4c_get_pte(tiaddr));
 970         int entry = BUCKET_NUM(tiaddr);
 971
 972         /* We are deleting a mapping, so the flush here is mandatory. */
 973         sun4c_flush_page(tiaddr);
 974         sun4c_flush_page(tiaddr + PAGE_SIZE);
 975
 976         sun4c_put_pte(tiaddr, 0);
 977         sun4c_put_pte(tiaddr + PAGE_SIZE, 0);
 978
 979         sun4c_bucket[entry] = BUCKET_EMPTY;
 980         if (entry < sun4c_lowbucket_avail)
 981                 sun4c_lowbucket_avail = entry;
 982
 983         free_pages(pages, THREAD_INFO_ORDER);
 984         garbage_collect(entry);
 985 }
 986
 987 static void __init sun4c_init_buckets(void)
 988 {
 989         int entry;
 990
 991         if (sizeof(union thread_union) != (PAGE_SIZE << THREAD_INFO_ORDER)) {
 992                 extern void thread_info_size_is_bolixed_pete(void);
 993                 thread_info_size_is_bolixed_pete();
 994         }
 995
 996         for (entry = 0; entry < NR_TASK_BUCKETS; entry++)
 997                 sun4c_bucket[entry] = BUCKET_EMPTY;
 998         sun4c_lowbucket_avail = 0;
 999 }
1000
1001 static unsigned long sun4c_iobuffer_start;
1002 static unsigned long sun4c_iobuffer_end;
1003 static unsigned long sun4c_iobuffer_high;
1004 static unsigned long *sun4c_iobuffer_map;
1005 static int iobuffer_map_size;
1006
1007 /*
1008  * Alias our pages so they do not cause a trap.
1009  * Also one page may be aliased into several I/O areas and we may
1010  * finish these I/O separately.
1011  */
1012 static char *sun4c_lockarea(char *vaddr, unsigned long size)
1013 {
1014         unsigned long base, scan;
1015         unsigned long npages;
1016         unsigned long vpage;
1017         unsigned long pte;
1018         unsigned long apage;
1019         unsigned long high;
1020         unsigned long flags;
1021
1022         npages = (((unsigned long)vaddr & ~PAGE_MASK) +
1023                   size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
1024
1025         local_irq_save(flags);
1026         base = bitmap_find_next_zero_area(sun4c_iobuffer_map, iobuffer_map_size,
1027                                                 0, npages, 0);
1028         if (base >= iobuffer_map_size)
1029                 goto abend;
1030
1031         high = ((base + npages) << PAGE_SHIFT) + sun4c_iobuffer_start;
1032         high = SUN4C_REAL_PGDIR_ALIGN(high);
1033         while (high > sun4c_iobuffer_high) {
1034                 get_locked_segment(sun4c_iobuffer_high);
1035                 sun4c_iobuffer_high += SUN4C_REAL_PGDIR_SIZE;
1036         }
1037
1038         vpage = ((unsigned long) vaddr) & PAGE_MASK;
1039         for (scan = base; scan < base+npages; scan++) {
1040                 pte = ((vpage-PAGE_OFFSET) >> PAGE_SHIFT);
1041                 pte |= pgprot_val(SUN4C_PAGE_KERNEL);
1042                 pte |= _SUN4C_PAGE_NOCACHE;
1043                 set_bit(scan, sun4c_iobuffer_map);
1044                 apage = (scan << PAGE_SHIFT) + sun4c_iobuffer_start;
1045
1046                 /* Flush original mapping so we see the right things later. */
1047                 sun4c_flush_page(vpage);
1048
1049                 sun4c_put_pte(apage, pte);
1050                 vpage += PAGE_SIZE;
1051         }
1052         local_irq_restore(flags);
1053         return (char *) ((base << PAGE_SHIFT) + sun4c_iobuffer_start +
1054                          (((unsigned long) vaddr) & ~PAGE_MASK));
1055
1056 abend:
1057         local_irq_restore(flags);
1058         printk("DMA vaddr=0x%p size=%08lx\n", vaddr, size);
1059         panic("Out of iobuffer table");
1060         return NULL;
1061 }
1062
1063 static void sun4c_unlockarea(char *vaddr, unsigned long size)
1064 {
1065         unsigned long vpage, npages;
1066         unsigned long flags;
1067         int scan, high;
1068
1069         vpage = (unsigned long)vaddr & PAGE_MASK;
1070         npages = (((unsigned long)vaddr & ~PAGE_MASK) +
1071                   size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
1072
1073         local_irq_save(flags);
1074         while (npages != 0) {
1075                 --npages;
1076
1077                 /* This mapping is marked non-cachable, no flush necessary. */
1078                 sun4c_put_pte(vpage, 0);
1079                 clear_bit((vpage - sun4c_iobuffer_start) >> PAGE_SHIFT,
1080                           sun4c_iobuffer_map);
1081                 vpage += PAGE_SIZE;
1082         }
1083
1084         /* garbage collect */
1085         scan = (sun4c_iobuffer_high - sun4c_iobuffer_start) >> PAGE_SHIFT;
1086         while (scan >= 0 && !sun4c_iobuffer_map[scan >> 5])
1087                 scan -= 32;
1088         scan += 32;
1089         high = sun4c_iobuffer_start + (scan << PAGE_SHIFT);
1090         high = SUN4C_REAL_PGDIR_ALIGN(high) + SUN4C_REAL_PGDIR_SIZE;
1091         while (high < sun4c_iobuffer_high) {
1092                 sun4c_iobuffer_high -= SUN4C_REAL_PGDIR_SIZE;
1093                 free_locked_segment(sun4c_iobuffer_high);
1094         }
1095         local_irq_restore(flags);
1096 }
1097
1098 /* Note the scsi code at init time passes to here buffers
1099  * which sit on the kernel stack, those are already locked
1100  * by implication and fool the page locking code above
1101  * if passed to by mistake.
1102  */
1103 static __u32 sun4c_get_scsi_one(struct device *dev, char *bufptr, unsigned long len)
1104 {
1105         unsigned long page;
1106
1107         page = ((unsigned long)bufptr) & PAGE_MASK;
1108         if (!virt_addr_valid(page)) {
1109                 sun4c_flush_page(page);
1110                 return (__u32)bufptr; /* already locked */
1111         }
1112         return (__u32)sun4c_lockarea(bufptr, len);
1113 }
1114
1115 static void sun4c_get_scsi_sgl(struct device *dev, struct scatterlist *sg, int sz)
1116 {
1117         while (sz != 0) {
1118                 --sz;
1119                 sg->dma_address = (__u32)sun4c_lockarea(sg_virt(sg), sg->length);
1120                 sg->dma_length = sg->length;
1121                 sg = sg_next(sg);
1122         }
1123 }
1124
1125 static void sun4c_release_scsi_one(struct device *dev, __u32 bufptr, unsigned long len)
1126 {
1127         if (bufptr < sun4c_iobuffer_start)
1128                 return; /* On kernel stack or similar, see above */
1129         sun4c_unlockarea((char *)bufptr, len);
1130 }
1131
1132 static void sun4c_release_scsi_sgl(struct device *dev, struct scatterlist *sg, int sz)
1133 {
1134         while (sz != 0) {
1135                 --sz;
1136                 sun4c_unlockarea((char *)sg->dma_address, sg->length);
1137                 sg = sg_next(sg);
1138         }
1139 }
1140
1141 #define TASK_ENTRY_SIZE    BUCKET_SIZE /* see above */
1142 #define LONG_ALIGN(x) (((x)+(sizeof(long))-1)&~((sizeof(long))-1))
1143
1144 struct vm_area_struct sun4c_kstack_vma;
1145
1146 static void __init sun4c_init_lock_areas(void)
1147 {
1148         unsigned long sun4c_taskstack_start;
1149         unsigned long sun4c_taskstack_end;
1150         int bitmap_size;
1151
1152         sun4c_init_buckets();
1153         sun4c_taskstack_start = SUN4C_LOCK_VADDR;
1154         sun4c_taskstack_end = (sun4c_taskstack_start +
1155                                (TASK_ENTRY_SIZE * NR_TASK_BUCKETS));
1156         if (sun4c_taskstack_end >= SUN4C_LOCK_END) {
1157                 prom_printf("Too many tasks, decrease NR_TASK_BUCKETS please.\n");
1158                 prom_halt();
1159         }
1160
1161         sun4c_iobuffer_start = sun4c_iobuffer_high =
1162                                 SUN4C_REAL_PGDIR_ALIGN(sun4c_taskstack_end);
1163         sun4c_iobuffer_end = SUN4C_LOCK_END;
1164         bitmap_size = (sun4c_iobuffer_end - sun4c_iobuffer_start) >> PAGE_SHIFT;
1165         bitmap_size = (bitmap_size + 7) >> 3;
1166         bitmap_size = LONG_ALIGN(bitmap_size);
1167         iobuffer_map_size = bitmap_size << 3;
1168         sun4c_iobuffer_map = __alloc_bootmem(bitmap_size, SMP_CACHE_BYTES, 0UL);
1169         memset((void *) sun4c_iobuffer_map, 0, bitmap_size);
1170
1171         sun4c_kstack_vma.vm_mm = &init_mm;
1172         sun4c_kstack_vma.vm_start = sun4c_taskstack_start;
1173         sun4c_kstack_vma.vm_end = sun4c_taskstack_end;
1174         sun4c_kstack_vma.vm_page_prot = PAGE_SHARED;
1175         sun4c_kstack_vma.vm_flags = VM_READ | VM_WRITE | VM_EXEC;
1176         insert_vm_struct(&init_mm, &sun4c_kstack_vma);
1177 }
1178
1179 /* Cache flushing on the sun4c. */
1180 static void sun4c_flush_cache_all(void)
1181 {
1182         unsigned long begin, end;
1183
1184         flush_user_windows();
1185         begin = (KERNBASE + SUN4C_REAL_PGDIR_SIZE);
1186         end = (begin + SUN4C_VAC_SIZE);
1187
1188         if (sun4c_vacinfo.linesize == 32) {
1189                 while (begin < end) {
1190                         __asm__ __volatile__(
1191                         "ld     [%0 + 0x00], %%g0\n\t"
1192                         "ld     [%0 + 0x20], %%g0\n\t"
1193                         "ld     [%0 + 0x40], %%g0\n\t"
1194                         "ld     [%0 + 0x60], %%g0\n\t"
1195                         "ld     [%0 + 0x80], %%g0\n\t"
1196                         "ld     [%0 + 0xa0], %%g0\n\t"
1197                         "ld     [%0 + 0xc0], %%g0\n\t"
1198                         "ld     [%0 + 0xe0], %%g0\n\t"
1199                         "ld     [%0 + 0x100], %%g0\n\t"
1200                         "ld     [%0 + 0x120], %%g0\n\t"
1201                         "ld     [%0 + 0x140], %%g0\n\t"
1202                         "ld     [%0 + 0x160], %%g0\n\t"
1203                         "ld     [%0 + 0x180], %%g0\n\t"
1204                         "ld     [%0 + 0x1a0], %%g0\n\t"
1205                         "ld     [%0 + 0x1c0], %%g0\n\t"
1206                         "ld     [%0 + 0x1e0], %%g0\n"
1207                         : : "r" (begin));
1208                         begin += 512;
1209                 }
1210         } else {
1211                 while (begin < end) {
1212                         __asm__ __volatile__(
1213                         "ld     [%0 + 0x00], %%g0\n\t"
1214                         "ld     [%0 + 0x10], %%g0\n\t"
1215                         "ld     [%0 + 0x20], %%g0\n\t"
1216                         "ld     [%0 + 0x30], %%g0\n\t"
1217                         "ld     [%0 + 0x40], %%g0\n\t"
1218                         "ld     [%0 + 0x50], %%g0\n\t"
1219                         "ld     [%0 + 0x60], %%g0\n\t"
1220                         "ld     [%0 + 0x70], %%g0\n\t"
1221                         "ld     [%0 + 0x80], %%g0\n\t"
1222                         "ld     [%0 + 0x90], %%g0\n\t"
1223                         "ld     [%0 + 0xa0], %%g0\n\t"
1224                         "ld     [%0 + 0xb0], %%g0\n\t"
1225                         "ld     [%0 + 0xc0], %%g0\n\t"
1226                         "ld     [%0 + 0xd0], %%g0\n\t"
1227                         "ld     [%0 + 0xe0], %%g0\n\t"
1228                         "ld     [%0 + 0xf0], %%g0\n"
1229                         : : "r" (begin));
1230                         begin += 256;
1231                 }
1232         }
1233 }
1234
1235 static void sun4c_flush_cache_mm(struct mm_struct *mm)
1236 {
1237         int new_ctx = mm->context;
1238
1239         if (new_ctx != NO_CONTEXT) {
1240                 flush_user_windows();
1241
1242                 if (sun4c_context_ring[new_ctx].num_entries) {
1243                         struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1244                         unsigned long flags;
1245
1246                         local_irq_save(flags);
1247                         if (head->next != head) {
1248                                 struct sun4c_mmu_entry *entry = head->next;
1249                                 int savectx = sun4c_get_context();
1250
1251                                 sun4c_set_context(new_ctx);
1252                                 sun4c_flush_context();
1253                                 do {
1254                                         struct sun4c_mmu_entry *next = entry->next;
1255
1256                                         sun4c_user_unmap(entry);
1257                                         free_user_entry(new_ctx, entry);
1258
1259                                         entry = next;
1260                                 } while (entry != head);
1261                                 sun4c_set_context(savectx);
1262                         }
1263                         local_irq_restore(flags);
1264                 }
1265         }
1266 }
1267
1268 static void sun4c_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
1269 {
1270         struct mm_struct *mm = vma->vm_mm;
1271         int new_ctx = mm->context;
1272
1273         if (new_ctx != NO_CONTEXT) {
1274                 struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1275                 struct sun4c_mmu_entry *entry;
1276                 unsigned long flags;
1277
1278                 flush_user_windows();
1279
1280                 local_irq_save(flags);
1281                 /* All user segmap chains are ordered on entry->vaddr. */
1282                 for (entry = head->next;
1283                      (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start);
1284                      entry = entry->next)
1285                         ;
1286
1287                 /* Tracing various job mixtures showed that this conditional
1288                  * only passes ~35% of the time for most worse case situations,
1289                  * therefore we avoid all of this gross overhead ~65% of the time.
1290                  */
1291                 if ((entry != head) && (entry->vaddr < end)) {
1292                         int octx = sun4c_get_context();
1293                         sun4c_set_context(new_ctx);
1294
1295                         /* At this point, always, (start >= entry->vaddr) and
1296                          * (entry->vaddr < end), once the latter condition
1297                          * ceases to hold, or we hit the end of the list, we
1298                          * exit the loop.  The ordering of all user allocated
1299                          * segmaps makes this all work out so beautifully.
1300                          */
1301                         do {
1302                                 struct sun4c_mmu_entry *next = entry->next;
1303                                 unsigned long realend;
1304
1305                                 /* "realstart" is always >= entry->vaddr */
1306                                 realend = entry->vaddr + SUN4C_REAL_PGDIR_SIZE;
1307                                 if (end < realend)
1308                                         realend = end;
1309                                 if ((realend - entry->vaddr) <= (PAGE_SIZE << 3)) {
1310                                         unsigned long page = entry->vaddr;
1311                                         while (page < realend) {
1312                                                 sun4c_flush_page(page);
1313                                                 page += PAGE_SIZE;
1314                                         }
1315                                 } else {
1316                                         sun4c_flush_segment(entry->vaddr);
1317                                         sun4c_user_unmap(entry);
1318                                         free_user_entry(new_ctx, entry);
1319                                 }
1320                                 entry = next;
1321                         } while ((entry != head) && (entry->vaddr < end));
1322                         sun4c_set_context(octx);
1323                 }
1324                 local_irq_restore(flags);
1325         }
1326 }
1327
1328 static void sun4c_flush_cache_page(struct vm_area_struct *vma, unsigned long page)
1329 {
1330         struct mm_struct *mm = vma->vm_mm;
1331         int new_ctx = mm->context;
1332
1333         /* Sun4c has no separate I/D caches so cannot optimize for non
1334          * text page flushes.
1335          */
1336         if (new_ctx != NO_CONTEXT) {
1337                 int octx = sun4c_get_context();
1338                 unsigned long flags;
1339
1340                 flush_user_windows();
1341                 local_irq_save(flags);
1342                 sun4c_set_context(new_ctx);
1343                 sun4c_flush_page(page);
1344                 sun4c_set_context(octx);
1345                 local_irq_restore(flags);
1346         }
1347 }
1348
1349 static void sun4c_flush_page_to_ram(unsigned long page)
1350 {
1351         unsigned long flags;
1352
1353         local_irq_save(flags);
1354         sun4c_flush_page(page);
1355         local_irq_restore(flags);
1356 }
1357
1358 /* Sun4c cache is unified, both instructions and data live there, so
1359  * no need to flush the on-stack instructions for new signal handlers.
1360  */
1361 static void sun4c_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr)
1362 {
1363 }
1364
1365 /* TLB flushing on the sun4c.  These routines count on the cache
1366  * flushing code to flush the user register windows so that we need
1367  * not do so when we get here.
1368  */
1369
1370 static void sun4c_flush_tlb_all(void)
1371 {
1372         struct sun4c_mmu_entry *this_entry, *next_entry;
1373         unsigned long flags;
1374         int savectx, ctx;
1375
1376         local_irq_save(flags);
1377         this_entry = sun4c_kernel_ring.ringhd.next;
1378         savectx = sun4c_get_context();
1379         flush_user_windows();
1380         while (sun4c_kernel_ring.num_entries) {
1381                 next_entry = this_entry->next;
1382                 sun4c_flush_segment(this_entry->vaddr);
1383                 for (ctx = 0; ctx < num_contexts; ctx++) {
1384                         sun4c_set_context(ctx);
1385                         sun4c_put_segmap(this_entry->vaddr, invalid_segment);
1386                 }
1387                 free_kernel_entry(this_entry, &sun4c_kernel_ring);
1388                 this_entry = next_entry;
1389         }
1390         sun4c_set_context(savectx);
1391         local_irq_restore(flags);
1392 }
1393
1394 static void sun4c_flush_tlb_mm(struct mm_struct *mm)
1395 {
1396         int new_ctx = mm->context;
1397
1398         if (new_ctx != NO_CONTEXT) {
1399                 struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1400                 unsigned long flags;
1401
1402                 local_irq_save(flags);
1403                 if (head->next != head) {
1404                         struct sun4c_mmu_entry *entry = head->next;
1405                         int savectx = sun4c_get_context();
1406
1407                         sun4c_set_context(new_ctx);
1408                         sun4c_flush_context();
1409                         do {
1410                                 struct sun4c_mmu_entry *next = entry->next;
1411
1412                                 sun4c_user_unmap(entry);
1413                                 free_user_entry(new_ctx, entry);
1414
1415                                 entry = next;
1416                         } while (entry != head);
1417                         sun4c_set_context(savectx);
1418                 }
1419                 local_irq_restore(flags);
1420         }
1421 }
1422
1423 static void sun4c_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
1424 {
1425         struct mm_struct *mm = vma->vm_mm;
1426         int new_ctx = mm->context;
1427
1428         if (new_ctx != NO_CONTEXT) {
1429                 struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1430                 struct sun4c_mmu_entry *entry;
1431                 unsigned long flags;
1432
1433                 local_irq_save(flags);
1434                 /* See commentary in sun4c_flush_cache_range(). */
1435                 for (entry = head->next;
1436                      (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start);
1437                      entry = entry->next)
1438                         ;
1439
1440                 if ((entry != head) && (entry->vaddr < end)) {
1441                         int octx = sun4c_get_context();
1442
1443                         sun4c_set_context(new_ctx);
1444                         do {
1445                                 struct sun4c_mmu_entry *next = entry->next;
1446
1447                                 sun4c_flush_segment(entry->vaddr);
1448                                 sun4c_user_unmap(entry);
1449                                 free_user_entry(new_ctx, entry);
1450
1451                                 entry = next;
1452                         } while ((entry != head) && (entry->vaddr < end));
1453                         sun4c_set_context(octx);
1454                 }
1455                 local_irq_restore(flags);
1456         }
1457 }
1458
1459 static void sun4c_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
1460 {
1461         struct mm_struct *mm = vma->vm_mm;
1462         int new_ctx = mm->context;
1463
1464         if (new_ctx != NO_CONTEXT) {
1465                 int savectx = sun4c_get_context();
1466                 unsigned long flags;
1467
1468                 local_irq_save(flags);
1469                 sun4c_set_context(new_ctx);
1470                 page &= PAGE_MASK;
1471                 sun4c_flush_page(page);
1472                 sun4c_put_pte(page, 0);
1473                 sun4c_set_context(savectx);
1474                 local_irq_restore(flags);
1475         }
1476 }
1477
1478 static inline void sun4c_mapioaddr(unsigned long physaddr, unsigned long virt_addr)
1479 {
1480         unsigned long page_entry, pg_iobits;
1481
1482         pg_iobits = _SUN4C_PAGE_PRESENT | _SUN4C_READABLE | _SUN4C_WRITEABLE |
1483                     _SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE;
1484
1485         page_entry = ((physaddr >> PAGE_SHIFT) & SUN4C_PFN_MASK);
1486         page_entry |= ((pg_iobits | _SUN4C_PAGE_PRIV) & ~(_SUN4C_PAGE_PRESENT));
1487         sun4c_put_pte(virt_addr, page_entry);
1488 }
1489
1490 static void sun4c_mapiorange(unsigned int bus, unsigned long xpa,
1491     unsigned long xva, unsigned int len)
1492 {
1493         while (len != 0) {
1494                 len -= PAGE_SIZE;
1495                 sun4c_mapioaddr(xpa, xva);
1496                 xva += PAGE_SIZE;
1497                 xpa += PAGE_SIZE;
1498         }
1499 }
1500
1501 static void sun4c_unmapiorange(unsigned long virt_addr, unsigned int len)
1502 {
1503         while (len != 0) {
1504                 len -= PAGE_SIZE;
1505                 sun4c_put_pte(virt_addr, 0);
1506                 virt_addr += PAGE_SIZE;
1507         }
1508 }
1509
1510 static void sun4c_alloc_context(struct mm_struct *old_mm, struct mm_struct *mm)
1511 {
1512         struct ctx_list *ctxp;
1513
1514         ctxp = ctx_free.next;
1515         if (ctxp != &ctx_free) {
1516                 remove_from_ctx_list(ctxp);
1517                 add_to_used_ctxlist(ctxp);
1518                 mm->context = ctxp->ctx_number;
1519                 ctxp->ctx_mm = mm;
1520                 return;
1521         }
1522         ctxp = ctx_used.next;
1523         if (ctxp->ctx_mm == old_mm)
1524                 ctxp = ctxp->next;
1525         remove_from_ctx_list(ctxp);
1526         add_to_used_ctxlist(ctxp);
1527         ctxp->ctx_mm->context = NO_CONTEXT;
1528         ctxp->ctx_mm = mm;
1529         mm->context = ctxp->ctx_number;
1530         sun4c_demap_context(&sun4c_context_ring[ctxp->ctx_number],
1531                                ctxp->ctx_number);
1532 }
1533
1534 /* Switch the current MM context. */
1535 static void sun4c_switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, struct task_struct *tsk, int cpu)
1536 {
1537         struct ctx_list *ctx;
1538         int dirty = 0;
1539
1540         if (mm->context == NO_CONTEXT) {
1541                 dirty = 1;
1542                 sun4c_alloc_context(old_mm, mm);
1543         } else {
1544                 /* Update the LRU ring of contexts. */
1545                 ctx = ctx_list_pool + mm->context;
1546                 remove_from_ctx_list(ctx);
1547                 add_to_used_ctxlist(ctx);
1548         }
1549         if (dirty || old_mm != mm)
1550                 sun4c_set_context(mm->context);
1551 }
1552
1553 static void sun4c_destroy_context(struct mm_struct *mm)
1554 {
1555         struct ctx_list *ctx_old;
1556
1557         if (mm->context != NO_CONTEXT) {
1558                 sun4c_demap_context(&sun4c_context_ring[mm->context], mm->context);
1559                 ctx_old = ctx_list_pool + mm->context;
1560                 remove_from_ctx_list(ctx_old);
1561                 add_to_free_ctxlist(ctx_old);
1562                 mm->context = NO_CONTEXT;
1563         }
1564 }
1565
1566 static void sun4c_mmu_info(struct seq_file *m)
1567 {
1568         int used_user_entries, i;
1569
1570         used_user_entries = 0;
1571         for (i = 0; i < num_contexts; i++)
1572                 used_user_entries += sun4c_context_ring[i].num_entries;
1573
1574         seq_printf(m,
1575                    "vacsize\t\t: %d bytes\n"
1576                    "vachwflush\t: %s\n"
1577                    "vaclinesize\t: %d bytes\n"
1578                    "mmuctxs\t\t: %d\n"
1579                    "mmupsegs\t: %d\n"
1580                    "kernelpsegs\t: %d\n"
1581                    "kfreepsegs\t: %d\n"
1582                    "usedpsegs\t: %d\n"
1583                    "ufreepsegs\t: %d\n"
1584                    "user_taken\t: %d\n"
1585                    "max_taken\t: %d\n",
1586                    sun4c_vacinfo.num_bytes,
1587                    (sun4c_vacinfo.do_hwflushes ? "yes" : "no"),
1588                    sun4c_vacinfo.linesize,
1589                    num_contexts,
1590                    (invalid_segment + 1),
1591                    sun4c_kernel_ring.num_entries,
1592                    sun4c_kfree_ring.num_entries,
1593                    used_user_entries,
1594                    sun4c_ufree_ring.num_entries,
1595                    sun4c_user_taken_entries,
1596                    max_user_taken_entries);
1597 }
1598
1599 /* Nothing below here should touch the mmu hardware nor the mmu_entry
1600  * data structures.
1601  */
1602
1603 /* First the functions which the mid-level code uses to directly
1604  * manipulate the software page tables.  Some defines since we are
1605  * emulating the i386 page directory layout.
1606  */
1607 #define PGD_PRESENT  0x001
1608 #define PGD_RW       0x002
1609 #define PGD_USER     0x004
1610 #define PGD_ACCESSED 0x020
1611 #define PGD_DIRTY    0x040
1612 #define PGD_TABLE    (PGD_PRESENT | PGD_RW | PGD_USER | PGD_ACCESSED | PGD_DIRTY)
1613
1614 static void sun4c_set_pte(pte_t *ptep, pte_t pte)
1615 {
1616         *ptep = pte;
1617 }
1618
1619 static void sun4c_pgd_set(pgd_t * pgdp, pmd_t * pmdp)
1620 {
1621 }
1622
1623 static void sun4c_pmd_set(pmd_t * pmdp, pte_t * ptep)
1624 {
1625         pmdp->pmdv[0] = PGD_TABLE | (unsigned long) ptep;
1626 }
1627
1628 static void sun4c_pmd_populate(pmd_t * pmdp, struct page * ptep)
1629 {
1630         if (page_address(ptep) == NULL) BUG();  /* No highmem on sun4c */
1631         pmdp->pmdv[0] = PGD_TABLE | (unsigned long) page_address(ptep);
1632 }
1633
1634 static int sun4c_pte_present(pte_t pte)
1635 {
1636         return ((pte_val(pte) & (_SUN4C_PAGE_PRESENT | _SUN4C_PAGE_PRIV)) != 0);
1637 }
1638 static void sun4c_pte_clear(pte_t *ptep)        { *ptep = __pte(0); }
1639
1640 static int sun4c_pmd_bad(pmd_t pmd)
1641 {
1642         return (((pmd_val(pmd) & ~PAGE_MASK) != PGD_TABLE) ||
1643                 (!virt_addr_valid(pmd_val(pmd))));
1644 }
1645
1646 static int sun4c_pmd_present(pmd_t pmd)
1647 {
1648         return ((pmd_val(pmd) & PGD_PRESENT) != 0);
1649 }
1650
1651 #if 0 /* if PMD takes one word */
1652 static void sun4c_pmd_clear(pmd_t *pmdp)        { *pmdp = __pmd(0); }
1653 #else /* if pmd_t is a longish aggregate */
1654 static void sun4c_pmd_clear(pmd_t *pmdp) {
1655         memset((void *)pmdp, 0, sizeof(pmd_t));
1656 }
1657 #endif
1658
1659 static int sun4c_pgd_none(pgd_t pgd)            { return 0; }
1660 static int sun4c_pgd_bad(pgd_t pgd)             { return 0; }
1661 static int sun4c_pgd_present(pgd_t pgd)         { return 1; }
1662 static void sun4c_pgd_clear(pgd_t * pgdp)       { }
1663
1664 /*
1665  * The following only work if pte_present() is true.
1666  * Undefined behaviour if not..
1667  */
1668 static pte_t sun4c_pte_mkwrite(pte_t pte)
1669 {
1670         pte = __pte(pte_val(pte) | _SUN4C_PAGE_WRITE);
1671         if (pte_val(pte) & _SUN4C_PAGE_MODIFIED)
1672                 pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE);
1673         return pte;
1674 }
1675
1676 static pte_t sun4c_pte_mkdirty(pte_t pte)
1677 {
1678         pte = __pte(pte_val(pte) | _SUN4C_PAGE_MODIFIED);
1679         if (pte_val(pte) & _SUN4C_PAGE_WRITE)
1680                 pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE);
1681         return pte;
1682 }
1683
1684 static pte_t sun4c_pte_mkyoung(pte_t pte)
1685 {
1686         pte = __pte(pte_val(pte) | _SUN4C_PAGE_ACCESSED);
1687         if (pte_val(pte) & _SUN4C_PAGE_READ)
1688                 pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_READ);
1689         return pte;
1690 }
1691
1692 /*
1693  * Conversion functions: convert a page and protection to a page entry,
1694  * and a page entry and page directory to the page they refer to.
1695  */
1696 static pte_t sun4c_mk_pte(struct page *page, pgprot_t pgprot)
1697 {
1698         return __pte(page_to_pfn(page) | pgprot_val(pgprot));
1699 }
1700
1701 static pte_t sun4c_mk_pte_phys(unsigned long phys_page, pgprot_t pgprot)
1702 {
1703         return __pte((phys_page >> PAGE_SHIFT) | pgprot_val(pgprot));
1704 }
1705
1706 static pte_t sun4c_mk_pte_io(unsigned long page, pgprot_t pgprot, int space)
1707 {
1708         return __pte(((page - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(pgprot));
1709 }
1710
1711 static unsigned long sun4c_pte_pfn(pte_t pte)
1712 {
1713         return pte_val(pte) & SUN4C_PFN_MASK;
1714 }
1715
1716 static pte_t sun4c_pgoff_to_pte(unsigned long pgoff)
1717 {
1718         return __pte(pgoff | _SUN4C_PAGE_FILE);
1719 }
1720
1721 static unsigned long sun4c_pte_to_pgoff(pte_t pte)
1722 {
1723         return pte_val(pte) & ((1UL << PTE_FILE_MAX_BITS) - 1);
1724 }
1725
1726
1727 static inline unsigned long sun4c_pmd_page_v(pmd_t pmd)
1728 {
1729         return (pmd_val(pmd) & PAGE_MASK);
1730 }
1731
1732 static struct page *sun4c_pmd_page(pmd_t pmd)
1733 {
1734         return virt_to_page(sun4c_pmd_page_v(pmd));
1735 }
1736
1737 static unsigned long sun4c_pgd_page(pgd_t pgd) { return 0; }
1738
1739 /* to find an entry in a page-table-directory */
1740 static inline pgd_t *sun4c_pgd_offset(struct mm_struct * mm, unsigned long address)
1741 {
1742         return mm->pgd + (address >> SUN4C_PGDIR_SHIFT);
1743 }
1744
1745 /* Find an entry in the second-level page table.. */
1746 static pmd_t *sun4c_pmd_offset(pgd_t * dir, unsigned long address)
1747 {
1748         return (pmd_t *) dir;
1749 }
1750
1751 /* Find an entry in the third-level page table.. */
1752 pte_t *sun4c_pte_offset_kernel(pmd_t * dir, unsigned long address)
1753 {
1754         return (pte_t *) sun4c_pmd_page_v(*dir) +
1755                         ((address >> PAGE_SHIFT) & (SUN4C_PTRS_PER_PTE - 1));
1756 }
1757
1758 static unsigned long sun4c_swp_type(swp_entry_t entry)
1759 {
1760         return (entry.val & SUN4C_SWP_TYPE_MASK);
1761 }
1762
1763 static unsigned long sun4c_swp_offset(swp_entry_t entry)
1764 {
1765         return (entry.val >> SUN4C_SWP_OFF_SHIFT) & SUN4C_SWP_OFF_MASK;
1766 }
1767
1768 static swp_entry_t sun4c_swp_entry(unsigned long type, unsigned long offset)
1769 {
1770         return (swp_entry_t) {
1771                   (offset & SUN4C_SWP_OFF_MASK) << SUN4C_SWP_OFF_SHIFT
1772                 | (type & SUN4C_SWP_TYPE_MASK) };
1773 }
1774
1775 static void sun4c_free_pte_slow(pte_t *pte)
1776 {
1777         free_page((unsigned long)pte);
1778 }
1779
1780 static void sun4c_free_pgd_slow(pgd_t *pgd)
1781 {
1782         free_page((unsigned long)pgd);
1783 }
1784
1785 static pgd_t *sun4c_get_pgd_fast(void)
1786 {
1787         unsigned long *ret;
1788
1789         if ((ret = pgd_quicklist) != NULL) {
1790                 pgd_quicklist = (unsigned long *)(*ret);
1791                 ret[0] = ret[1];
1792                 pgtable_cache_size--;
1793         } else {
1794                 pgd_t *init;
1795
1796                 ret = (unsigned long *)__get_free_page(GFP_KERNEL);
1797                 memset (ret, 0, (KERNBASE / SUN4C_PGDIR_SIZE) * sizeof(pgd_t));
1798                 init = sun4c_pgd_offset(&init_mm, 0);
1799                 memcpy (((pgd_t *)ret) + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
1800                         (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
1801         }
1802         return (pgd_t *)ret;
1803 }
1804
1805 static void sun4c_free_pgd_fast(pgd_t *pgd)
1806 {
1807         *(unsigned long *)pgd = (unsigned long) pgd_quicklist;
1808         pgd_quicklist = (unsigned long *) pgd;
1809         pgtable_cache_size++;
1810 }
1811
1812
1813 static inline pte_t *
1814 sun4c_pte_alloc_one_fast(struct mm_struct *mm, unsigned long address)
1815 {
1816         unsigned long *ret;
1817
1818         if ((ret = (unsigned long *)pte_quicklist) != NULL) {
1819                 pte_quicklist = (unsigned long *)(*ret);
1820                 ret[0] = ret[1];
1821                 pgtable_cache_size--;
1822         }
1823         return (pte_t *)ret;
1824 }
1825
1826 static pte_t *sun4c_pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
1827 {
1828         pte_t *pte;
1829
1830         if ((pte = sun4c_pte_alloc_one_fast(mm, address)) != NULL)
1831                 return pte;
1832
1833         pte = (pte_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
1834         return pte;
1835 }
1836
1837 static pgtable_t sun4c_pte_alloc_one(struct mm_struct *mm, unsigned long address)
1838 {
1839         pte_t *pte;
1840         struct page *page;
1841
1842         pte = sun4c_pte_alloc_one_kernel(mm, address);
1843         if (pte == NULL)
1844                 return NULL;
1845         page = virt_to_page(pte);
1846         pgtable_page_ctor(page);
1847         return page;
1848 }
1849
1850 static inline void sun4c_free_pte_fast(pte_t *pte)
1851 {
1852         *(unsigned long *)pte = (unsigned long) pte_quicklist;
1853         pte_quicklist = (unsigned long *) pte;
1854         pgtable_cache_size++;
1855 }
1856
1857 static void sun4c_pte_free(pgtable_t pte)
1858 {
1859         pgtable_page_dtor(pte);
1860         sun4c_free_pte_fast(page_address(pte));
1861 }
1862
1863 /*
1864  * allocating and freeing a pmd is trivial: the 1-entry pmd is
1865  * inside the pgd, so has no extra memory associated with it.
1866  */
1867 static pmd_t *sun4c_pmd_alloc_one(struct mm_struct *mm, unsigned long address)
1868 {
1869         BUG();
1870         return NULL;
1871 }
1872
1873 static void sun4c_free_pmd_fast(pmd_t * pmd) { }
1874
1875 static void sun4c_check_pgt_cache(int low, int high)
1876 {
1877         if (pgtable_cache_size > high) {
1878                 do {
1879                         if (pgd_quicklist)
1880                                 sun4c_free_pgd_slow(sun4c_get_pgd_fast());
1881                         if (pte_quicklist)
1882                                 sun4c_free_pte_slow(sun4c_pte_alloc_one_fast(NULL, 0));
1883                 } while (pgtable_cache_size > low);
1884         }
1885 }
1886
1887 /* An experiment, turn off by default for now... -DaveM */
1888 #define SUN4C_PRELOAD_PSEG
1889
1890 void sun4c_update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep)
1891 {
1892         unsigned long flags;
1893         int pseg;
1894
1895         if (vma->vm_mm->context == NO_CONTEXT)
1896                 return;
1897
1898         local_irq_save(flags);
1899         address &= PAGE_MASK;
1900         if ((pseg = sun4c_get_segmap(address)) == invalid_segment) {
1901                 struct sun4c_mmu_entry *entry = sun4c_user_strategy();
1902                 struct mm_struct *mm = vma->vm_mm;
1903                 unsigned long start, end;
1904
1905                 entry->vaddr = start = (address & SUN4C_REAL_PGDIR_MASK);
1906                 entry->ctx = mm->context;
1907                 add_ring_ordered(sun4c_context_ring + mm->context, entry);
1908                 sun4c_put_segmap(entry->vaddr, entry->pseg);
1909                 end = start + SUN4C_REAL_PGDIR_SIZE;
1910                 while (start < end) {
1911 #ifdef SUN4C_PRELOAD_PSEG
1912                         pgd_t *pgdp = sun4c_pgd_offset(mm, start);
1913                         pte_t *ptep;
1914
1915                         if (!pgdp)
1916                                 goto no_mapping;
1917                         ptep = sun4c_pte_offset_kernel((pmd_t *) pgdp, start);
1918                         if (!ptep || !(pte_val(*ptep) & _SUN4C_PAGE_PRESENT))
1919                                 goto no_mapping;
1920                         sun4c_put_pte(start, pte_val(*ptep));
1921                         goto next;
1922
1923                 no_mapping:
1924 #endif
1925                         sun4c_put_pte(start, 0);
1926 #ifdef SUN4C_PRELOAD_PSEG
1927                 next:
1928 #endif
1929                         start += PAGE_SIZE;
1930                 }
1931 #ifndef SUN4C_PRELOAD_PSEG
1932                 sun4c_put_pte(address, pte_val(*ptep));
1933 #endif
1934                 local_irq_restore(flags);
1935                 return;
1936         } else {
1937                 struct sun4c_mmu_entry *entry = &mmu_entry_pool[pseg];
1938
1939                 remove_lru(entry);
1940                 add_lru(entry);
1941         }
1942
1943         sun4c_put_pte(address, pte_val(*ptep));
1944         local_irq_restore(flags);
1945 }
1946
1947 extern void sparc_context_init(int);
1948 extern unsigned long bootmem_init(unsigned long *pages_avail);
1949 extern unsigned long last_valid_pfn;
1950
1951 void __init sun4c_paging_init(void)
1952 {
1953         int i, cnt;
1954         unsigned long kernel_end, vaddr;
1955         extern struct resource sparc_iomap;
1956         unsigned long end_pfn, pages_avail;
1957
1958         kernel_end = (unsigned long) &_end;
1959         kernel_end = SUN4C_REAL_PGDIR_ALIGN(kernel_end);
1960
1961         pages_avail = 0;
1962         last_valid_pfn = bootmem_init(&pages_avail);
1963         end_pfn = last_valid_pfn;
1964
1965         sun4c_probe_mmu();
1966         invalid_segment = (num_segmaps - 1);
1967         sun4c_init_mmu_entry_pool();
1968         sun4c_init_rings();
1969         sun4c_init_map_kernelprom(kernel_end);
1970         sun4c_init_clean_mmu(kernel_end);
1971         sun4c_init_fill_kernel_ring(SUN4C_KERNEL_BUCKETS);
1972         sun4c_init_lock_area(sparc_iomap.start, IOBASE_END);
1973         sun4c_init_lock_area(DVMA_VADDR, DVMA_END);
1974         sun4c_init_lock_areas();
1975         sun4c_init_fill_user_ring();
1976
1977         sun4c_set_context(0);
1978         memset(swapper_pg_dir, 0, PAGE_SIZE);
1979         memset(pg0, 0, PAGE_SIZE);
1980         memset(pg1, 0, PAGE_SIZE);
1981         memset(pg2, 0, PAGE_SIZE);
1982         memset(pg3, 0, PAGE_SIZE);
1983
1984         /* Save work later. */
1985         vaddr = VMALLOC_START;
1986         swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg0);
1987         vaddr += SUN4C_PGDIR_SIZE;
1988         swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg1);
1989         vaddr += SUN4C_PGDIR_SIZE;
1990         swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg2);
1991         vaddr += SUN4C_PGDIR_SIZE;
1992         swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg3);
1993         sun4c_init_ss2_cache_bug();
1994         sparc_context_init(num_contexts);
1995
1996         {
1997                 unsigned long zones_size[MAX_NR_ZONES];
1998                 unsigned long zholes_size[MAX_NR_ZONES];
1999                 unsigned long npages;
2000                 int znum;
2001
2002                 for (znum = 0; znum < MAX_NR_ZONES; znum++)
2003                         zones_size[znum] = zholes_size[znum] = 0;
2004
2005                 npages = max_low_pfn - pfn_base;
2006
2007                 zones_size[ZONE_DMA] = npages;
2008                 zholes_size[ZONE_DMA] = npages - pages_avail;
2009
2010                 npages = highend_pfn - max_low_pfn;
2011                 zones_size[ZONE_HIGHMEM] = npages;
2012                 zholes_size[ZONE_HIGHMEM] = npages - calc_highpages();
2013
2014                 free_area_init_node(0, zones_size, pfn_base, zholes_size);
2015         }
2016
2017         cnt = 0;
2018         for (i = 0; i < num_segmaps; i++)
2019                 if (mmu_entry_pool[i].locked)
2020                         cnt++;
2021
2022         max_user_taken_entries = num_segmaps - cnt - 40 - 1;
2023
2024         printk("SUN4C: %d mmu entries for the kernel\n", cnt);
2025 }
2026
2027 static pgprot_t sun4c_pgprot_noncached(pgprot_t prot)
2028 {
2029         prot |= __pgprot(_SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE);
2030
2031         return prot;
2032 }
2033
2034 /* Load up routines and constants for sun4c mmu */
2035 void __init ld_mmu_sun4c(void)
2036 {
2037         extern void ___xchg32_sun4c(void);
2038
2039         printk("Loading sun4c MMU routines\n");
2040
2041         /* First the constants */
2042         BTFIXUPSET_SIMM13(pgdir_shift, SUN4C_PGDIR_SHIFT);
2043         BTFIXUPSET_SETHI(pgdir_size, SUN4C_PGDIR_SIZE);
2044         BTFIXUPSET_SETHI(pgdir_mask, SUN4C_PGDIR_MASK);
2045
2046         BTFIXUPSET_SIMM13(ptrs_per_pmd, SUN4C_PTRS_PER_PMD);
2047         BTFIXUPSET_SIMM13(ptrs_per_pgd, SUN4C_PTRS_PER_PGD);
2048         BTFIXUPSET_SIMM13(user_ptrs_per_pgd, KERNBASE / SUN4C_PGDIR_SIZE);
2049
2050         BTFIXUPSET_INT(page_none, pgprot_val(SUN4C_PAGE_NONE));
2051         PAGE_SHARED = pgprot_val(SUN4C_PAGE_SHARED);
2052         BTFIXUPSET_INT(page_copy, pgprot_val(SUN4C_PAGE_COPY));
2053         BTFIXUPSET_INT(page_readonly, pgprot_val(SUN4C_PAGE_READONLY));
2054         BTFIXUPSET_INT(page_kernel, pgprot_val(SUN4C_PAGE_KERNEL));
2055         page_kernel = pgprot_val(SUN4C_PAGE_KERNEL);
2056
2057         /* Functions */
2058         BTFIXUPSET_CALL(pgprot_noncached, sun4c_pgprot_noncached, BTFIXUPCALL_NORM);
2059         BTFIXUPSET_CALL(___xchg32, ___xchg32_sun4c, BTFIXUPCALL_NORM);
2060         BTFIXUPSET_CALL(do_check_pgt_cache, sun4c_check_pgt_cache, BTFIXUPCALL_NORM);
2061
2062         BTFIXUPSET_CALL(flush_cache_all, sun4c_flush_cache_all, BTFIXUPCALL_NORM);
2063
2064         if (sun4c_vacinfo.do_hwflushes) {
2065                 BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_hw, BTFIXUPCALL_NORM);
2066                 BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_hw, BTFIXUPCALL_NORM);
2067                 BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_hw, BTFIXUPCALL_NORM);
2068         } else {
2069                 BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_sw, BTFIXUPCALL_NORM);
2070                 BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_sw, BTFIXUPCALL_NORM);
2071                 BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_sw, BTFIXUPCALL_NORM);
2072         }
2073
2074         BTFIXUPSET_CALL(flush_tlb_mm, sun4c_flush_tlb_mm, BTFIXUPCALL_NORM);
2075         BTFIXUPSET_CALL(flush_cache_mm, sun4c_flush_cache_mm, BTFIXUPCALL_NORM);
2076         BTFIXUPSET_CALL(destroy_context, sun4c_destroy_context, BTFIXUPCALL_NORM);
2077         BTFIXUPSET_CALL(switch_mm, sun4c_switch_mm, BTFIXUPCALL_NORM);
2078         BTFIXUPSET_CALL(flush_cache_page, sun4c_flush_cache_page, BTFIXUPCALL_NORM);
2079         BTFIXUPSET_CALL(flush_tlb_page, sun4c_flush_tlb_page, BTFIXUPCALL_NORM);
2080         BTFIXUPSET_CALL(flush_tlb_range, sun4c_flush_tlb_range, BTFIXUPCALL_NORM);
2081         BTFIXUPSET_CALL(flush_cache_range, sun4c_flush_cache_range, BTFIXUPCALL_NORM);
2082         BTFIXUPSET_CALL(__flush_page_to_ram, sun4c_flush_page_to_ram, BTFIXUPCALL_NORM);
2083         BTFIXUPSET_CALL(flush_tlb_all, sun4c_flush_tlb_all, BTFIXUPCALL_NORM);
2084
2085         BTFIXUPSET_CALL(flush_sig_insns, sun4c_flush_sig_insns, BTFIXUPCALL_NOP);
2086
2087         BTFIXUPSET_CALL(set_pte, sun4c_set_pte, BTFIXUPCALL_STO1O0);
2088
2089         /* The 2.4.18 code does not set this on sun4c, how does it work? XXX */
2090         /* BTFIXUPSET_SETHI(none_mask, 0x00000000); */  /* Defaults to zero? */
2091
2092         BTFIXUPSET_CALL(pte_pfn, sun4c_pte_pfn, BTFIXUPCALL_NORM);
2093 #if 0 /* PAGE_SHIFT <= 12 */ /* Eek. Investigate. XXX */
2094         BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_ANDNINT(PAGE_SIZE - 1));
2095 #else
2096         BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_NORM);
2097 #endif
2098         BTFIXUPSET_CALL(pmd_set, sun4c_pmd_set, BTFIXUPCALL_NORM);
2099         BTFIXUPSET_CALL(pmd_populate, sun4c_pmd_populate, BTFIXUPCALL_NORM);
2100
2101         BTFIXUPSET_CALL(pte_present, sun4c_pte_present, BTFIXUPCALL_NORM);
2102         BTFIXUPSET_CALL(pte_clear, sun4c_pte_clear, BTFIXUPCALL_STG0O0);
2103
2104         BTFIXUPSET_CALL(pmd_bad, sun4c_pmd_bad, BTFIXUPCALL_NORM);
2105         BTFIXUPSET_CALL(pmd_present, sun4c_pmd_present, BTFIXUPCALL_NORM);
2106         BTFIXUPSET_CALL(pmd_clear, sun4c_pmd_clear, BTFIXUPCALL_STG0O0);
2107
2108         BTFIXUPSET_CALL(pgd_none, sun4c_pgd_none, BTFIXUPCALL_RETINT(0));
2109         BTFIXUPSET_CALL(pgd_bad, sun4c_pgd_bad, BTFIXUPCALL_RETINT(0));
2110         BTFIXUPSET_CALL(pgd_present, sun4c_pgd_present, BTFIXUPCALL_RETINT(1));
2111         BTFIXUPSET_CALL(pgd_clear, sun4c_pgd_clear, BTFIXUPCALL_NOP);
2112
2113         BTFIXUPSET_CALL(mk_pte, sun4c_mk_pte, BTFIXUPCALL_NORM);
2114         BTFIXUPSET_CALL(mk_pte_phys, sun4c_mk_pte_phys, BTFIXUPCALL_NORM);
2115         BTFIXUPSET_CALL(mk_pte_io, sun4c_mk_pte_io, BTFIXUPCALL_NORM);
2116
2117         BTFIXUPSET_INT(pte_modify_mask, _SUN4C_PAGE_CHG_MASK);
2118         BTFIXUPSET_CALL(pmd_offset, sun4c_pmd_offset, BTFIXUPCALL_NORM);
2119         BTFIXUPSET_CALL(pte_offset_kernel, sun4c_pte_offset_kernel, BTFIXUPCALL_NORM);
2120         BTFIXUPSET_CALL(free_pte_fast, sun4c_free_pte_fast, BTFIXUPCALL_NORM);
2121         BTFIXUPSET_CALL(pte_free, sun4c_pte_free, BTFIXUPCALL_NORM);
2122         BTFIXUPSET_CALL(pte_alloc_one_kernel, sun4c_pte_alloc_one_kernel, BTFIXUPCALL_NORM);
2123         BTFIXUPSET_CALL(pte_alloc_one, sun4c_pte_alloc_one, BTFIXUPCALL_NORM);
2124         BTFIXUPSET_CALL(free_pmd_fast, sun4c_free_pmd_fast, BTFIXUPCALL_NOP);
2125         BTFIXUPSET_CALL(pmd_alloc_one, sun4c_pmd_alloc_one, BTFIXUPCALL_RETO0);
2126         BTFIXUPSET_CALL(free_pgd_fast, sun4c_free_pgd_fast, BTFIXUPCALL_NORM);
2127         BTFIXUPSET_CALL(get_pgd_fast, sun4c_get_pgd_fast, BTFIXUPCALL_NORM);
2128
2129         BTFIXUPSET_HALF(pte_writei, _SUN4C_PAGE_WRITE);
2130         BTFIXUPSET_HALF(pte_dirtyi, _SUN4C_PAGE_MODIFIED);
2131         BTFIXUPSET_HALF(pte_youngi, _SUN4C_PAGE_ACCESSED);
2132         BTFIXUPSET_HALF(pte_filei, _SUN4C_PAGE_FILE);
2133         BTFIXUPSET_HALF(pte_wrprotecti, _SUN4C_PAGE_WRITE|_SUN4C_PAGE_SILENT_WRITE);
2134         BTFIXUPSET_HALF(pte_mkcleani, _SUN4C_PAGE_MODIFIED|_SUN4C_PAGE_SILENT_WRITE);
2135         BTFIXUPSET_HALF(pte_mkoldi, _SUN4C_PAGE_ACCESSED|_SUN4C_PAGE_SILENT_READ);
2136         BTFIXUPSET_CALL(pte_mkwrite, sun4c_pte_mkwrite, BTFIXUPCALL_NORM);
2137         BTFIXUPSET_CALL(pte_mkdirty, sun4c_pte_mkdirty, BTFIXUPCALL_NORM);
2138         BTFIXUPSET_CALL(pte_mkyoung, sun4c_pte_mkyoung, BTFIXUPCALL_NORM);
2139         BTFIXUPSET_CALL(update_mmu_cache, sun4c_update_mmu_cache, BTFIXUPCALL_NORM);
2140
2141         BTFIXUPSET_CALL(pte_to_pgoff, sun4c_pte_to_pgoff, BTFIXUPCALL_NORM);
2142         BTFIXUPSET_CALL(pgoff_to_pte, sun4c_pgoff_to_pte, BTFIXUPCALL_NORM);
2143
2144         BTFIXUPSET_CALL(mmu_lockarea, sun4c_lockarea, BTFIXUPCALL_NORM);
2145         BTFIXUPSET_CALL(mmu_unlockarea, sun4c_unlockarea, BTFIXUPCALL_NORM);
2146
2147         BTFIXUPSET_CALL(mmu_get_scsi_one, sun4c_get_scsi_one, BTFIXUPCALL_NORM);
2148         BTFIXUPSET_CALL(mmu_get_scsi_sgl, sun4c_get_scsi_sgl, BTFIXUPCALL_NORM);
2149         BTFIXUPSET_CALL(mmu_release_scsi_one, sun4c_release_scsi_one, BTFIXUPCALL_NORM);
2150         BTFIXUPSET_CALL(mmu_release_scsi_sgl, sun4c_release_scsi_sgl, BTFIXUPCALL_NORM);
2151
2152         BTFIXUPSET_CALL(mmu_map_dma_area, sun4c_map_dma_area, BTFIXUPCALL_NORM);
2153         BTFIXUPSET_CALL(mmu_unmap_dma_area, sun4c_unmap_dma_area, BTFIXUPCALL_NORM);
2154
2155         BTFIXUPSET_CALL(sparc_mapiorange, sun4c_mapiorange, BTFIXUPCALL_NORM);
2156         BTFIXUPSET_CALL(sparc_unmapiorange, sun4c_unmapiorange, BTFIXUPCALL_NORM);
2157
2158         BTFIXUPSET_CALL(__swp_type, sun4c_swp_type, BTFIXUPCALL_NORM);
2159         BTFIXUPSET_CALL(__swp_offset, sun4c_swp_offset, BTFIXUPCALL_NORM);
2160         BTFIXUPSET_CALL(__swp_entry, sun4c_swp_entry, BTFIXUPCALL_NORM);
2161
2162         BTFIXUPSET_CALL(alloc_thread_info, sun4c_alloc_thread_info, BTFIXUPCALL_NORM);
2163         BTFIXUPSET_CALL(free_thread_info, sun4c_free_thread_info, BTFIXUPCALL_NORM);
2164
2165         BTFIXUPSET_CALL(mmu_info, sun4c_mmu_info, BTFIXUPCALL_NORM);
2166
2167         /* These should _never_ get called with two level tables. */
2168         BTFIXUPSET_CALL(pgd_set, sun4c_pgd_set, BTFIXUPCALL_NOP);
2169         BTFIXUPSET_CALL(pgd_page_vaddr, sun4c_pgd_page, BTFIXUPCALL_RETO0);
2170 }