SAFE public projects git trees. - safe/jmp/linux-2.6/blob - arch/um/kernel/tlb.c

   1 /*
   2  * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #include "linux/mm.h"
   7 #include "asm/page.h"
   8 #include "asm/pgalloc.h"
   9 #include "asm/tlbflush.h"
  10 #include "choose-mode.h"
  11 #include "mode_kern.h"
  12 #include "user_util.h"
  13 #include "tlb.h"
  14 #include "mem.h"
  15 #include "mem_user.h"
  16 #include "os.h"
  17
  18 static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
  19                     int r, int w, int x, struct host_vm_op *ops, int index,
  20                     int last_filled, union mm_context *mmu, void **flush,
  21                     void *(*do_ops)(union mm_context *, struct host_vm_op *,
  22                                     int, int, void *))
  23 {
  24         __u64 offset;
  25         struct host_vm_op *last;
  26         int fd;
  27
  28         fd = phys_mapping(phys, &offset);
  29         if(index != -1){
  30                 last = &ops[index];
  31                 if((last->type == MMAP) &&
  32                    (last->u.mmap.addr + last->u.mmap.len == virt) &&
  33                    (last->u.mmap.r == r) && (last->u.mmap.w == w) &&
  34                    (last->u.mmap.x == x) && (last->u.mmap.fd == fd) &&
  35                    (last->u.mmap.offset + last->u.mmap.len == offset)){
  36                         last->u.mmap.len += len;
  37                         return index;
  38                 }
  39         }
  40
  41         if(index == last_filled){
  42                 *flush = (*do_ops)(mmu, ops, last_filled, 0, *flush);
  43                 index = -1;
  44         }
  45
  46         ops[++index] = ((struct host_vm_op) { .type     = MMAP,
  47                                               .u = { .mmap = {
  48                                                       .addr     = virt,
  49                                                       .len      = len,
  50                                                       .r        = r,
  51                                                       .w        = w,
  52                                                       .x        = x,
  53                                                       .fd       = fd,
  54                                                       .offset   = offset }
  55                                               } });
  56         return index;
  57 }
  58
  59 static int add_munmap(unsigned long addr, unsigned long len,
  60                       struct host_vm_op *ops, int index, int last_filled,
  61                       union mm_context *mmu, void **flush,
  62                       void *(*do_ops)(union mm_context *, struct host_vm_op *,
  63                                       int, int, void *))
  64 {
  65         struct host_vm_op *last;
  66
  67         if(index != -1){
  68                 last = &ops[index];
  69                 if((last->type == MUNMAP) &&
  70                    (last->u.munmap.addr + last->u.mmap.len == addr)){
  71                         last->u.munmap.len += len;
  72                         return index;
  73                 }
  74         }
  75
  76         if(index == last_filled){
  77                 *flush = (*do_ops)(mmu, ops, last_filled, 0, *flush);
  78                 index = -1;
  79         }
  80
  81         ops[++index] = ((struct host_vm_op) { .type     = MUNMAP,
  82                                               .u = { .munmap = {
  83                                                       .addr     = addr,
  84                                                       .len      = len } } });
  85         return index;
  86 }
  87
  88 static int add_mprotect(unsigned long addr, unsigned long len, int r, int w,
  89                         int x, struct host_vm_op *ops, int index,
  90                         int last_filled, union mm_context *mmu, void **flush,
  91                         void *(*do_ops)(union mm_context *,
  92                                        struct host_vm_op *, int, int, void *))
  93 {
  94         struct host_vm_op *last;
  95
  96         if(index != -1){
  97                 last = &ops[index];
  98                 if((last->type == MPROTECT) &&
  99                    (last->u.mprotect.addr + last->u.mprotect.len == addr) &&
 100                    (last->u.mprotect.r == r) && (last->u.mprotect.w == w) &&
 101                    (last->u.mprotect.x == x)){
 102                         last->u.mprotect.len += len;
 103                         return index;
 104                 }
 105         }
 106
 107         if(index == last_filled){
 108                 *flush = (*do_ops)(mmu, ops, last_filled, 0, *flush);
 109                 index = -1;
 110         }
 111
 112         ops[++index] = ((struct host_vm_op) { .type     = MPROTECT,
 113                                               .u = { .mprotect = {
 114                                                       .addr     = addr,
 115                                                       .len      = len,
 116                                                       .r        = r,
 117                                                       .w        = w,
 118                                                       .x        = x } } });
 119         return index;
 120 }
 121
 122 #define ADD_ROUND(n, inc) (((n) + (inc)) & ~((inc) - 1))
 123
 124 void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
 125                       unsigned long end_addr, int force,
 126                       void *(*do_ops)(union mm_context *, struct host_vm_op *,
 127                                       int, int, void *))
 128 {
 129         pgd_t *npgd;
 130         pud_t *npud;
 131         pmd_t *npmd;
 132         pte_t *npte;
 133         union mm_context *mmu = &mm->context;
 134         unsigned long addr, end;
 135         int r, w, x;
 136         struct host_vm_op ops[1];
 137         void *flush = NULL;
 138         int op_index = -1, last_op = sizeof(ops) / sizeof(ops[0]) - 1;
 139
 140         if(mm == NULL) return;
 141
 142         ops[0].type = NONE;
 143         for(addr = start_addr; addr < end_addr;){
 144                 npgd = pgd_offset(mm, addr);
 145                 if(!pgd_present(*npgd)){
 146                         end = ADD_ROUND(addr, PGDIR_SIZE);
 147                         if(end > end_addr)
 148                                 end = end_addr;
 149                         if(force || pgd_newpage(*npgd)){
 150                                 op_index = add_munmap(addr, end - addr, ops,
 151                                                       op_index, last_op, mmu,
 152                                                       &flush, do_ops);
 153                                 pgd_mkuptodate(*npgd);
 154                         }
 155                         addr = end;
 156                         continue;
 157                 }
 158
 159                 npud = pud_offset(npgd, addr);
 160                 if(!pud_present(*npud)){
 161                         end = ADD_ROUND(addr, PUD_SIZE);
 162                         if(end > end_addr)
 163                                 end = end_addr;
 164                         if(force || pud_newpage(*npud)){
 165                                 op_index = add_munmap(addr, end - addr, ops,
 166                                                       op_index, last_op, mmu,
 167                                                       &flush, do_ops);
 168                                 pud_mkuptodate(*npud);
 169                         }
 170                         addr = end;
 171                         continue;
 172                 }
 173
 174                 npmd = pmd_offset(npud, addr);
 175                 if(!pmd_present(*npmd)){
 176                         end = ADD_ROUND(addr, PMD_SIZE);
 177                         if(end > end_addr)
 178                                 end = end_addr;
 179                         if(force || pmd_newpage(*npmd)){
 180                                 op_index = add_munmap(addr, end - addr, ops,
 181                                                       op_index, last_op, mmu,
 182                                                       &flush, do_ops);
 183                                 pmd_mkuptodate(*npmd);
 184                         }
 185                         addr = end;
 186                         continue;
 187                 }
 188
 189                 npte = pte_offset_kernel(npmd, addr);
 190                 r = pte_read(*npte);
 191                 w = pte_write(*npte);
 192                 x = pte_exec(*npte);
 193                 if(!pte_dirty(*npte))
 194                         w = 0;
 195                 if(!pte_young(*npte)){
 196                         r = 0;
 197                         w = 0;
 198                 }
 199                 if(force || pte_newpage(*npte)){
 200                         if(pte_present(*npte))
 201                                 op_index = add_mmap(addr,
 202                                                     pte_val(*npte) & PAGE_MASK,
 203                                                     PAGE_SIZE, r, w, x, ops,
 204                                                     op_index, last_op, mmu,
 205                                                     &flush, do_ops);
 206                         else op_index = add_munmap(addr, PAGE_SIZE, ops,
 207                                                    op_index, last_op, mmu,
 208                                                    &flush, do_ops);
 209                 }
 210                 else if(pte_newprot(*npte))
 211                         op_index = add_mprotect(addr, PAGE_SIZE, r, w, x, ops,
 212                                                 op_index, last_op, mmu,
 213                                                 &flush, do_ops);
 214
 215                 *npte = pte_mkuptodate(*npte);
 216                 addr += PAGE_SIZE;
 217         }
 218         flush = (*do_ops)(mmu, ops, op_index, 1, flush);
 219 }
 220
 221 int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
 222 {
 223         struct mm_struct *mm;
 224         pgd_t *pgd;
 225         pud_t *pud;
 226         pmd_t *pmd;
 227         pte_t *pte;
 228         unsigned long addr, last;
 229         int updated = 0, err;
 230
 231         mm = &init_mm;
 232         for(addr = start; addr < end;){
 233                 pgd = pgd_offset(mm, addr);
 234                 if(!pgd_present(*pgd)){
 235                         last = ADD_ROUND(addr, PGDIR_SIZE);
 236                         if(last > end)
 237                                 last = end;
 238                         if(pgd_newpage(*pgd)){
 239                                 updated = 1;
 240                                 err = os_unmap_memory((void *) addr,
 241                                                       last - addr);
 242                                 if(err < 0)
 243                                         panic("munmap failed, errno = %d\n",
 244                                               -err);
 245                         }
 246                         addr = last;
 247                         continue;
 248                 }
 249
 250                 pud = pud_offset(pgd, addr);
 251                 if(!pud_present(*pud)){
 252                         last = ADD_ROUND(addr, PUD_SIZE);
 253                         if(last > end)
 254                                 last = end;
 255                         if(pud_newpage(*pud)){
 256                                 updated = 1;
 257                                 err = os_unmap_memory((void *) addr,
 258                                                       last - addr);
 259                                 if(err < 0)
 260                                         panic("munmap failed, errno = %d\n",
 261                                               -err);
 262                         }
 263                         addr = last;
 264                         continue;
 265                 }
 266
 267                 pmd = pmd_offset(pud, addr);
 268                 if(!pmd_present(*pmd)){
 269                         last = ADD_ROUND(addr, PMD_SIZE);
 270                         if(last > end)
 271                                 last = end;
 272                         if(pmd_newpage(*pmd)){
 273                                 updated = 1;
 274                                 err = os_unmap_memory((void *) addr,
 275                                                       last - addr);
 276                                 if(err < 0)
 277                                         panic("munmap failed, errno = %d\n",
 278                                               -err);
 279                         }
 280                         addr = last;
 281                         continue;
 282                 }
 283
 284                 pte = pte_offset_kernel(pmd, addr);
 285                 if(!pte_present(*pte) || pte_newpage(*pte)){
 286                         updated = 1;
 287                         err = os_unmap_memory((void *) addr,
 288                                               PAGE_SIZE);
 289                         if(err < 0)
 290                                 panic("munmap failed, errno = %d\n",
 291                                       -err);
 292                         if(pte_present(*pte))
 293                                 map_memory(addr,
 294                                            pte_val(*pte) & PAGE_MASK,
 295                                            PAGE_SIZE, 1, 1, 1);
 296                 }
 297                 else if(pte_newprot(*pte)){
 298                         updated = 1;
 299                         protect_memory(addr, PAGE_SIZE, 1, 1, 1, 1);
 300                 }
 301                 addr += PAGE_SIZE;
 302         }
 303         return(updated);
 304 }
 305
 306 pgd_t *pgd_offset_proc(struct mm_struct *mm, unsigned long address)
 307 {
 308         return(pgd_offset(mm, address));
 309 }
 310
 311 pud_t *pud_offset_proc(pgd_t *pgd, unsigned long address)
 312 {
 313         return(pud_offset(pgd, address));
 314 }
 315
 316 pmd_t *pmd_offset_proc(pud_t *pud, unsigned long address)
 317 {
 318         return(pmd_offset(pud, address));
 319 }
 320
 321 pte_t *pte_offset_proc(pmd_t *pmd, unsigned long address)
 322 {
 323         return(pte_offset_kernel(pmd, address));
 324 }
 325
 326 pte_t *addr_pte(struct task_struct *task, unsigned long addr)
 327 {
 328         pgd_t *pgd = pgd_offset(task->mm, addr);
 329         pud_t *pud = pud_offset(pgd, addr);
 330         pmd_t *pmd = pmd_offset(pud, addr);
 331
 332         return(pte_offset_map(pmd, addr));
 333 }
 334
 335 void flush_tlb_page(struct vm_area_struct *vma, unsigned long address)
 336 {
 337         address &= PAGE_MASK;
 338         flush_tlb_range(vma, address, address + PAGE_SIZE);
 339 }
 340
 341 void flush_tlb_all(void)
 342 {
 343         flush_tlb_mm(current->mm);
 344 }
 345
 346 void flush_tlb_kernel_range(unsigned long start, unsigned long end)
 347 {
 348         CHOOSE_MODE_PROC(flush_tlb_kernel_range_tt,
 349                          flush_tlb_kernel_range_common, start, end);
 350 }
 351
 352 void flush_tlb_kernel_vm(void)
 353 {
 354         CHOOSE_MODE(flush_tlb_kernel_vm_tt(),
 355                     flush_tlb_kernel_range_common(start_vm, end_vm));
 356 }
 357
 358 void __flush_tlb_one(unsigned long addr)
 359 {
 360         CHOOSE_MODE_PROC(__flush_tlb_one_tt, __flush_tlb_one_skas, addr);
 361 }
 362
 363 void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
 364                      unsigned long end)
 365 {
 366         CHOOSE_MODE_PROC(flush_tlb_range_tt, flush_tlb_range_skas, vma, start,
 367                          end);
 368 }
 369
 370 void flush_tlb_mm(struct mm_struct *mm)
 371 {
 372         CHOOSE_MODE_PROC(flush_tlb_mm_tt, flush_tlb_mm_skas, mm);
 373 }
 374
 375 void force_flush_all(void)
 376 {
 377         CHOOSE_MODE(force_flush_all_tt(), force_flush_all_skas());
 378 }
 379