2 * Procedures for interfacing to Open Firmware.
4 * Paul Mackerras August 1996.
5 * Copyright (C) 1996-2005 Paul Mackerras.
7 * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
8 * {engebret|bergner}@us.ibm.com
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
19 #include <linux/config.h>
20 #include <linux/kernel.h>
21 #include <linux/string.h>
22 #include <linux/init.h>
23 #include <linux/threads.h>
24 #include <linux/spinlock.h>
25 #include <linux/types.h>
26 #include <linux/pci.h>
27 #include <linux/proc_fs.h>
28 #include <linux/stringify.h>
29 #include <linux/delay.h>
30 #include <linux/initrd.h>
31 #include <linux/bitops.h>
35 #include <asm/processor.h>
39 #include <asm/system.h>
41 #include <asm/pgtable.h>
43 #include <asm/iommu.h>
44 #include <asm/btext.h>
45 #include <asm/sections.h>
46 #include <asm/machdep.h>
48 #ifdef CONFIG_LOGO_LINUX_CLUT224
49 #include <linux/linux_logo.h>
50 extern const struct linux_logo logo_linux_clut224;
54 * Properties whose value is longer than this get excluded from our
55 * copy of the device tree. This value does need to be big enough to
56 * ensure that we don't lose things like the interrupt-map property
57 * on a PCI-PCI bridge.
59 #define MAX_PROPERTY_LENGTH (1UL * 1024 * 1024)
62 * Eventually bump that one up
64 #define DEVTREE_CHUNK_SIZE 0x100000
67 * This is the size of the local memory reserve map that gets copied
68 * into the boot params passed to the kernel. That size is totally
69 * flexible as the kernel just reads the list until it encounters an
70 * entry with size 0, so it can be changed without breaking binary
73 #define MEM_RESERVE_MAP_SIZE 8
76 * prom_init() is called very early on, before the kernel text
77 * and data have been mapped to KERNELBASE. At this point the code
78 * is running at whatever address it has been loaded at.
79 * On ppc32 we compile with -mrelocatable, which means that references
80 * to extern and static variables get relocated automatically.
81 * On ppc64 we have to relocate the references explicitly with
82 * RELOC. (Note that strings count as static variables.)
84 * Because OF may have mapped I/O devices into the area starting at
85 * KERNELBASE, particularly on CHRP machines, we can't safely call
86 * OF once the kernel has been mapped to KERNELBASE. Therefore all
87 * OF calls must be done within prom_init().
89 * ADDR is used in calls to call_prom. The 4th and following
90 * arguments to call_prom should be 32-bit values.
91 * On ppc64, 64 bit values are truncated to 32 bits (and
92 * fortunately don't get interpreted as two arguments).
95 #define RELOC(x) (*PTRRELOC(&(x)))
96 #define ADDR(x) (u32) add_reloc_offset((unsigned long)(x))
97 #define OF_WORKAROUNDS 0
100 #define ADDR(x) (u32) (x)
101 #define OF_WORKAROUNDS of_workarounds
105 #define OF_WA_CLAIM 1 /* do phys/virt claim separately, then map */
106 #define OF_WA_LONGTRAIL 2 /* work around longtrail bugs */
108 #define PROM_BUG() do { \
109 prom_printf("kernel BUG at %s line 0x%x!\n", \
110 RELOC(__FILE__), __LINE__); \
111 __asm__ __volatile__(".long " BUG_ILLEGAL_INSTR); \
115 #define prom_debug(x...) prom_printf(x)
117 #define prom_debug(x...)
121 typedef u32 prom_arg_t;
139 struct mem_map_entry {
146 extern void __start(unsigned long r3, unsigned long r4, unsigned long r5);
149 extern int enter_prom(struct prom_args *args, unsigned long entry);
151 static inline int enter_prom(struct prom_args *args, unsigned long entry)
153 return ((int (*)(struct prom_args *))entry)(args);
157 extern void copy_and_flush(unsigned long dest, unsigned long src,
158 unsigned long size, unsigned long offset);
161 static struct prom_t __initdata prom;
163 static unsigned long prom_entry __initdata;
165 #define PROM_SCRATCH_SIZE 256
167 static char __initdata of_stdout_device[256];
168 static char __initdata prom_scratch[PROM_SCRATCH_SIZE];
170 static unsigned long __initdata dt_header_start;
171 static unsigned long __initdata dt_struct_start, dt_struct_end;
172 static unsigned long __initdata dt_string_start, dt_string_end;
174 static unsigned long __initdata prom_initrd_start, prom_initrd_end;
177 static int __initdata iommu_force_on;
178 static int __initdata ppc64_iommu_off;
179 static unsigned long __initdata prom_tce_alloc_start;
180 static unsigned long __initdata prom_tce_alloc_end;
183 static int __initdata of_platform;
185 static char __initdata prom_cmd_line[COMMAND_LINE_SIZE];
187 static unsigned long __initdata prom_memory_limit;
189 static unsigned long __initdata alloc_top;
190 static unsigned long __initdata alloc_top_high;
191 static unsigned long __initdata alloc_bottom;
192 static unsigned long __initdata rmo_top;
193 static unsigned long __initdata ram_top;
196 static unsigned long __initdata prom_crashk_base;
197 static unsigned long __initdata prom_crashk_size;
200 static struct mem_map_entry __initdata mem_reserve_map[MEM_RESERVE_MAP_SIZE];
201 static int __initdata mem_reserve_cnt;
203 static cell_t __initdata regbuf[1024];
206 #define MAX_CPU_THREADS 2
209 * Error results ... some OF calls will return "-1" on error, some
210 * will return 0, some will return either. To simplify, here are
211 * macros to use with any ihandle or phandle return value to check if
215 #define PROM_ERROR (-1u)
216 #define PHANDLE_VALID(p) ((p) != 0 && (p) != PROM_ERROR)
217 #define IHANDLE_VALID(i) ((i) != 0 && (i) != PROM_ERROR)
220 /* This is the one and *ONLY* place where we actually call open
224 static int __init call_prom(const char *service, int nargs, int nret, ...)
227 struct prom_args args;
230 args.service = ADDR(service);
234 va_start(list, nret);
235 for (i = 0; i < nargs; i++)
236 args.args[i] = va_arg(list, prom_arg_t);
239 for (i = 0; i < nret; i++)
240 args.args[nargs+i] = 0;
242 if (enter_prom(&args, RELOC(prom_entry)) < 0)
245 return (nret > 0) ? args.args[nargs] : 0;
248 static int __init call_prom_ret(const char *service, int nargs, int nret,
249 prom_arg_t *rets, ...)
252 struct prom_args args;
255 args.service = ADDR(service);
259 va_start(list, rets);
260 for (i = 0; i < nargs; i++)
261 args.args[i] = va_arg(list, prom_arg_t);
264 for (i = 0; i < nret; i++)
265 args.args[nargs+i] = 0;
267 if (enter_prom(&args, RELOC(prom_entry)) < 0)
271 for (i = 1; i < nret; ++i)
272 rets[i-1] = args.args[nargs+i];
274 return (nret > 0) ? args.args[nargs] : 0;
278 static void __init prom_print(const char *msg)
281 struct prom_t *_prom = &RELOC(prom);
283 if (_prom->stdout == 0)
286 for (p = msg; *p != 0; p = q) {
287 for (q = p; *q != 0 && *q != '\n'; ++q)
290 call_prom("write", 3, 1, _prom->stdout, p, q - p);
294 call_prom("write", 3, 1, _prom->stdout, ADDR("\r\n"), 2);
299 static void __init prom_print_hex(unsigned long val)
301 int i, nibbles = sizeof(val)*2;
302 char buf[sizeof(val)*2+1];
303 struct prom_t *_prom = &RELOC(prom);
305 for (i = nibbles-1; i >= 0; i--) {
306 buf[i] = (val & 0xf) + '0';
308 buf[i] += ('a'-'0'-10);
312 call_prom("write", 3, 1, _prom->stdout, buf, nibbles);
316 static void __init prom_printf(const char *format, ...)
318 const char *p, *q, *s;
321 struct prom_t *_prom = &RELOC(prom);
323 va_start(args, format);
325 format = PTRRELOC(format);
327 for (p = format; *p != 0; p = q) {
328 for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
331 call_prom("write", 3, 1, _prom->stdout, p, q - p);
336 call_prom("write", 3, 1, _prom->stdout,
346 s = va_arg(args, const char *);
351 v = va_arg(args, unsigned long);
359 static unsigned int __init prom_claim(unsigned long virt, unsigned long size,
362 struct prom_t *_prom = &RELOC(prom);
364 if (align == 0 && (OF_WORKAROUNDS & OF_WA_CLAIM)) {
366 * Old OF requires we claim physical and virtual separately
367 * and then map explicitly (assuming virtual mode)
372 ret = call_prom_ret("call-method", 5, 2, &result,
373 ADDR("claim"), _prom->memory,
375 if (ret != 0 || result == -1)
377 ret = call_prom_ret("call-method", 5, 2, &result,
378 ADDR("claim"), _prom->mmumap,
381 call_prom("call-method", 4, 1, ADDR("release"),
382 _prom->memory, size, virt);
385 /* the 0x12 is M (coherence) + PP == read/write */
386 call_prom("call-method", 6, 1,
387 ADDR("map"), _prom->mmumap, 0x12, size, virt, virt);
390 return call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size,
394 static void __init __attribute__((noreturn)) prom_panic(const char *reason)
397 reason = PTRRELOC(reason);
400 /* Do not call exit because it clears the screen on pmac
401 * it also causes some sort of double-fault on early pmacs */
402 if (RELOC(of_platform) == PLATFORM_POWERMAC)
405 /* ToDo: should put up an SRC here on p/iSeries */
406 call_prom("exit", 0, 0);
408 for (;;) /* should never get here */
413 static int __init prom_next_node(phandle *nodep)
417 if ((node = *nodep) != 0
418 && (*nodep = call_prom("child", 1, 1, node)) != 0)
420 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
423 if ((node = call_prom("parent", 1, 1, node)) == 0)
425 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
430 static int inline prom_getprop(phandle node, const char *pname,
431 void *value, size_t valuelen)
433 return call_prom("getprop", 4, 1, node, ADDR(pname),
434 (u32)(unsigned long) value, (u32) valuelen);
437 static int inline prom_getproplen(phandle node, const char *pname)
439 return call_prom("getproplen", 2, 1, node, ADDR(pname));
442 static void add_string(char **str, const char *q)
452 static char *tohex(unsigned int x)
454 static char digits[] = "0123456789abcdef";
455 static char result[9];
462 result[i] = digits[x & 0xf];
464 } while (x != 0 && i > 0);
468 static int __init prom_setprop(phandle node, const char *nodename,
469 const char *pname, void *value, size_t valuelen)
473 if (!(OF_WORKAROUNDS & OF_WA_LONGTRAIL))
474 return call_prom("setprop", 4, 1, node, ADDR(pname),
475 (u32)(unsigned long) value, (u32) valuelen);
477 /* gah... setprop doesn't work on longtrail, have to use interpret */
479 add_string(&p, "dev");
480 add_string(&p, nodename);
481 add_string(&p, tohex((u32)(unsigned long) value));
482 add_string(&p, tohex(valuelen));
483 add_string(&p, tohex(ADDR(pname)));
484 add_string(&p, tohex(strlen(RELOC(pname))));
485 add_string(&p, "property");
487 return call_prom("interpret", 1, 1, (u32)(unsigned long) cmd);
490 /* We can't use the standard versions because of RELOC headaches. */
491 #define isxdigit(c) (('0' <= (c) && (c) <= '9') \
492 || ('a' <= (c) && (c) <= 'f') \
493 || ('A' <= (c) && (c) <= 'F'))
495 #define isdigit(c) ('0' <= (c) && (c) <= '9')
496 #define islower(c) ('a' <= (c) && (c) <= 'z')
497 #define toupper(c) (islower(c) ? ((c) - 'a' + 'A') : (c))
499 unsigned long prom_strtoul(const char *cp, const char **endp)
501 unsigned long result = 0, base = 10, value;
506 if (toupper(*cp) == 'X') {
512 while (isxdigit(*cp) &&
513 (value = isdigit(*cp) ? *cp - '0' : toupper(*cp) - 'A' + 10) < base) {
514 result = result * base + value;
524 unsigned long prom_memparse(const char *ptr, const char **retptr)
526 unsigned long ret = prom_strtoul(ptr, retptr);
530 * We can't use a switch here because GCC *may* generate a
531 * jump table which won't work, because we're not running at
532 * the address we're linked at.
534 if ('G' == **retptr || 'g' == **retptr)
537 if ('M' == **retptr || 'm' == **retptr)
540 if ('K' == **retptr || 'k' == **retptr)
552 * Early parsing of the command line passed to the kernel, used for
553 * "mem=x" and the options that affect the iommu
555 static void __init early_cmdline_parse(void)
557 struct prom_t *_prom = &RELOC(prom);
562 RELOC(prom_cmd_line[0]) = 0;
563 p = RELOC(prom_cmd_line);
564 if ((long)_prom->chosen > 0)
565 l = prom_getprop(_prom->chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
566 #ifdef CONFIG_CMDLINE
567 if (l == 0) /* dbl check */
568 strlcpy(RELOC(prom_cmd_line),
569 RELOC(CONFIG_CMDLINE), sizeof(prom_cmd_line));
570 #endif /* CONFIG_CMDLINE */
571 prom_printf("command line: %s\n", RELOC(prom_cmd_line));
574 opt = strstr(RELOC(prom_cmd_line), RELOC("iommu="));
576 prom_printf("iommu opt is: %s\n", opt);
578 while (*opt && *opt == ' ')
580 if (!strncmp(opt, RELOC("off"), 3))
581 RELOC(ppc64_iommu_off) = 1;
582 else if (!strncmp(opt, RELOC("force"), 5))
583 RELOC(iommu_force_on) = 1;
587 opt = strstr(RELOC(prom_cmd_line), RELOC("mem="));
590 RELOC(prom_memory_limit) = prom_memparse(opt, (const char **)&opt);
592 /* Align to 16 MB == size of ppc64 large page */
593 RELOC(prom_memory_limit) = ALIGN(RELOC(prom_memory_limit), 0x1000000);
599 * crashkernel=size@addr specifies the location to reserve for
602 opt = strstr(RELOC(prom_cmd_line), RELOC("crashkernel="));
605 RELOC(prom_crashk_size) =
606 prom_memparse(opt, (const char **)&opt);
608 if (ALIGN(RELOC(prom_crashk_size), 0x1000000) !=
609 RELOC(prom_crashk_size)) {
610 prom_printf("Warning: crashkernel size is not "
611 "aligned to 16MB\n");
615 * At present, the crash kernel always run at 32MB.
616 * Just ignore whatever user passed.
618 RELOC(prom_crashk_base) = 0x2000000;
620 prom_printf("Warning: PPC64 kdump kernel always runs "
627 #ifdef CONFIG_PPC_PSERIES
629 * To tell the firmware what our capabilities are, we have to pass
630 * it a fake 32-bit ELF header containing a couple of PT_NOTE sections
631 * that contain structures that contain the actual values.
633 static struct fake_elf {
640 char name[8]; /* "PowerPC" */
654 char name[24]; /* "IBM,RPA-Client-Config" */
668 .e_ident = { 0x7f, 'E', 'L', 'F',
669 ELFCLASS32, ELFDATA2MSB, EV_CURRENT },
670 .e_type = ET_EXEC, /* yeah right */
672 .e_version = EV_CURRENT,
673 .e_phoff = offsetof(struct fake_elf, phdr),
674 .e_phentsize = sizeof(Elf32_Phdr),
680 .p_offset = offsetof(struct fake_elf, chrpnote),
681 .p_filesz = sizeof(struct chrpnote)
684 .p_offset = offsetof(struct fake_elf, rpanote),
685 .p_filesz = sizeof(struct rpanote)
689 .namesz = sizeof("PowerPC"),
690 .descsz = sizeof(struct chrpdesc),
694 .real_mode = ~0U, /* ~0 means "don't care" */
703 .namesz = sizeof("IBM,RPA-Client-Config"),
704 .descsz = sizeof(struct rpadesc),
706 .name = "IBM,RPA-Client-Config",
709 .min_rmo_size = 64, /* in megabytes */
710 .min_rmo_percent = 0,
711 .max_pft_size = 48, /* 2^48 bytes max PFT size */
719 static void __init prom_send_capabilities(void)
723 elfloader = call_prom("open", 1, 1, ADDR("/packages/elf-loader"));
724 if (elfloader == 0) {
725 prom_printf("couldn't open /packages/elf-loader\n");
728 call_prom("call-method", 3, 1, ADDR("process-elf-header"),
729 elfloader, ADDR(&fake_elf));
730 call_prom("close", 1, 0, elfloader);
735 * Memory allocation strategy... our layout is normally:
737 * at 14Mb or more we have vmlinux, then a gap and initrd. In some
738 * rare cases, initrd might end up being before the kernel though.
739 * We assume this won't override the final kernel at 0, we have no
740 * provision to handle that in this version, but it should hopefully
743 * alloc_top is set to the top of RMO, eventually shrink down if the
746 * alloc_bottom is set to the top of kernel/initrd
748 * from there, allocations are done this way : rtas is allocated
749 * topmost, and the device-tree is allocated from the bottom. We try
750 * to grow the device-tree allocation as we progress. If we can't,
751 * then we fail, we don't currently have a facility to restart
752 * elsewhere, but that shouldn't be necessary.
754 * Note that calls to reserve_mem have to be done explicitly, memory
755 * allocated with either alloc_up or alloc_down isn't automatically
761 * Allocates memory in the RMO upward from the kernel/initrd
763 * When align is 0, this is a special case, it means to allocate in place
764 * at the current location of alloc_bottom or fail (that is basically
765 * extending the previous allocation). Used for the device-tree flattening
767 static unsigned long __init alloc_up(unsigned long size, unsigned long align)
769 unsigned long base = RELOC(alloc_bottom);
770 unsigned long addr = 0;
773 base = _ALIGN_UP(base, align);
774 prom_debug("alloc_up(%x, %x)\n", size, align);
775 if (RELOC(ram_top) == 0)
776 prom_panic("alloc_up() called with mem not initialized\n");
779 base = _ALIGN_UP(RELOC(alloc_bottom), align);
781 base = RELOC(alloc_bottom);
783 for(; (base + size) <= RELOC(alloc_top);
784 base = _ALIGN_UP(base + 0x100000, align)) {
785 prom_debug(" trying: 0x%x\n\r", base);
786 addr = (unsigned long)prom_claim(base, size, 0);
787 if (addr != PROM_ERROR && addr != 0)
795 RELOC(alloc_bottom) = addr;
797 prom_debug(" -> %x\n", addr);
798 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom));
799 prom_debug(" alloc_top : %x\n", RELOC(alloc_top));
800 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
801 prom_debug(" rmo_top : %x\n", RELOC(rmo_top));
802 prom_debug(" ram_top : %x\n", RELOC(ram_top));
808 * Allocates memory downward, either from top of RMO, or if highmem
809 * is set, from the top of RAM. Note that this one doesn't handle
810 * failures. It does claim memory if highmem is not set.
812 static unsigned long __init alloc_down(unsigned long size, unsigned long align,
815 unsigned long base, addr = 0;
817 prom_debug("alloc_down(%x, %x, %s)\n", size, align,
818 highmem ? RELOC("(high)") : RELOC("(low)"));
819 if (RELOC(ram_top) == 0)
820 prom_panic("alloc_down() called with mem not initialized\n");
823 /* Carve out storage for the TCE table. */
824 addr = _ALIGN_DOWN(RELOC(alloc_top_high) - size, align);
825 if (addr <= RELOC(alloc_bottom))
827 /* Will we bump into the RMO ? If yes, check out that we
828 * didn't overlap existing allocations there, if we did,
829 * we are dead, we must be the first in town !
831 if (addr < RELOC(rmo_top)) {
832 /* Good, we are first */
833 if (RELOC(alloc_top) == RELOC(rmo_top))
834 RELOC(alloc_top) = RELOC(rmo_top) = addr;
838 RELOC(alloc_top_high) = addr;
842 base = _ALIGN_DOWN(RELOC(alloc_top) - size, align);
843 for (; base > RELOC(alloc_bottom);
844 base = _ALIGN_DOWN(base - 0x100000, align)) {
845 prom_debug(" trying: 0x%x\n\r", base);
846 addr = (unsigned long)prom_claim(base, size, 0);
847 if (addr != PROM_ERROR && addr != 0)
853 RELOC(alloc_top) = addr;
856 prom_debug(" -> %x\n", addr);
857 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom));
858 prom_debug(" alloc_top : %x\n", RELOC(alloc_top));
859 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
860 prom_debug(" rmo_top : %x\n", RELOC(rmo_top));
861 prom_debug(" ram_top : %x\n", RELOC(ram_top));
869 static unsigned long __init prom_next_cell(int s, cell_t **cellp)
874 /* Ignore more than 2 cells */
875 while (s > sizeof(unsigned long) / 4) {
891 * Very dumb function for adding to the memory reserve list, but
892 * we don't need anything smarter at this point
894 * XXX Eventually check for collisions. They should NEVER happen.
895 * If problems seem to show up, it would be a good start to track
898 static void reserve_mem(u64 base, u64 size)
900 u64 top = base + size;
901 unsigned long cnt = RELOC(mem_reserve_cnt);
906 /* We need to always keep one empty entry so that we
907 * have our terminator with "size" set to 0 since we are
908 * dumb and just copy this entire array to the boot params
910 base = _ALIGN_DOWN(base, PAGE_SIZE);
911 top = _ALIGN_UP(top, PAGE_SIZE);
914 if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))
915 prom_panic("Memory reserve map exhausted !\n");
916 RELOC(mem_reserve_map)[cnt].base = base;
917 RELOC(mem_reserve_map)[cnt].size = size;
918 RELOC(mem_reserve_cnt) = cnt + 1;
922 * Initialize memory allocation mecanism, parse "memory" nodes and
923 * obtain that way the top of memory and RMO to setup out local allocator
925 static void __init prom_init_mem(void)
928 char *path, type[64];
931 struct prom_t *_prom = &RELOC(prom);
935 * We iterate the memory nodes to find
936 * 1) top of RMO (first node)
940 prom_getprop(_prom->root, "#address-cells", &rac, sizeof(rac));
942 prom_getprop(_prom->root, "#size-cells", &rsc, sizeof(rsc));
943 prom_debug("root_addr_cells: %x\n", (unsigned long) rac);
944 prom_debug("root_size_cells: %x\n", (unsigned long) rsc);
946 prom_debug("scanning memory:\n");
947 path = RELOC(prom_scratch);
949 for (node = 0; prom_next_node(&node); ) {
951 prom_getprop(node, "device_type", type, sizeof(type));
955 * CHRP Longtrail machines have no device_type
956 * on the memory node, so check the name instead...
958 prom_getprop(node, "name", type, sizeof(type));
960 if (strcmp(type, RELOC("memory")))
963 plen = prom_getprop(node, "reg", RELOC(regbuf), sizeof(regbuf));
964 if (plen > sizeof(regbuf)) {
965 prom_printf("memory node too large for buffer !\n");
966 plen = sizeof(regbuf);
969 endp = p + (plen / sizeof(cell_t));
972 memset(path, 0, PROM_SCRATCH_SIZE);
973 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
974 prom_debug(" node %s :\n", path);
975 #endif /* DEBUG_PROM */
977 while ((endp - p) >= (rac + rsc)) {
978 unsigned long base, size;
980 base = prom_next_cell(rac, &p);
981 size = prom_next_cell(rsc, &p);
985 prom_debug(" %x %x\n", base, size);
986 if (base == 0 && (RELOC(of_platform) & PLATFORM_LPAR))
987 RELOC(rmo_top) = size;
988 if ((base + size) > RELOC(ram_top))
989 RELOC(ram_top) = base + size;
993 RELOC(alloc_bottom) = PAGE_ALIGN((unsigned long)&RELOC(_end) + 0x4000);
995 /* Check if we have an initrd after the kernel, if we do move our bottom
998 if (RELOC(prom_initrd_start)) {
999 if (RELOC(prom_initrd_end) > RELOC(alloc_bottom))
1000 RELOC(alloc_bottom) = PAGE_ALIGN(RELOC(prom_initrd_end));
1004 * If prom_memory_limit is set we reduce the upper limits *except* for
1005 * alloc_top_high. This must be the real top of RAM so we can put
1009 RELOC(alloc_top_high) = RELOC(ram_top);
1011 if (RELOC(prom_memory_limit)) {
1012 if (RELOC(prom_memory_limit) <= RELOC(alloc_bottom)) {
1013 prom_printf("Ignoring mem=%x <= alloc_bottom.\n",
1014 RELOC(prom_memory_limit));
1015 RELOC(prom_memory_limit) = 0;
1016 } else if (RELOC(prom_memory_limit) >= RELOC(ram_top)) {
1017 prom_printf("Ignoring mem=%x >= ram_top.\n",
1018 RELOC(prom_memory_limit));
1019 RELOC(prom_memory_limit) = 0;
1021 RELOC(ram_top) = RELOC(prom_memory_limit);
1022 RELOC(rmo_top) = min(RELOC(rmo_top), RELOC(prom_memory_limit));
1027 * Setup our top alloc point, that is top of RMO or top of
1028 * segment 0 when running non-LPAR.
1029 * Some RS64 machines have buggy firmware where claims up at
1030 * 1GB fail. Cap at 768MB as a workaround.
1031 * Since 768MB is plenty of room, and we need to cap to something
1032 * reasonable on 32-bit, cap at 768MB on all machines.
1034 if (!RELOC(rmo_top))
1035 RELOC(rmo_top) = RELOC(ram_top);
1036 RELOC(rmo_top) = min(0x30000000ul, RELOC(rmo_top));
1037 RELOC(alloc_top) = RELOC(rmo_top);
1039 prom_printf("memory layout at init:\n");
1040 prom_printf(" memory_limit : %x (16 MB aligned)\n", RELOC(prom_memory_limit));
1041 prom_printf(" alloc_bottom : %x\n", RELOC(alloc_bottom));
1042 prom_printf(" alloc_top : %x\n", RELOC(alloc_top));
1043 prom_printf(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
1044 prom_printf(" rmo_top : %x\n", RELOC(rmo_top));
1045 prom_printf(" ram_top : %x\n", RELOC(ram_top));
1047 if (RELOC(prom_crashk_base)) {
1048 prom_printf(" crashk_base : %x\n", RELOC(prom_crashk_base));
1049 prom_printf(" crashk_size : %x\n", RELOC(prom_crashk_size));
1056 * Allocate room for and instantiate RTAS
1058 static void __init prom_instantiate_rtas(void)
1062 u32 base, entry = 0;
1065 prom_debug("prom_instantiate_rtas: start...\n");
1067 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1068 prom_debug("rtas_node: %x\n", rtas_node);
1069 if (!PHANDLE_VALID(rtas_node))
1072 prom_getprop(rtas_node, "rtas-size", &size, sizeof(size));
1076 base = alloc_down(size, PAGE_SIZE, 0);
1078 prom_printf("RTAS allocation failed !\n");
1082 rtas_inst = call_prom("open", 1, 1, ADDR("/rtas"));
1083 if (!IHANDLE_VALID(rtas_inst)) {
1084 prom_printf("opening rtas package failed (%x)\n", rtas_inst);
1088 prom_printf("instantiating rtas at 0x%x ...", base);
1090 if (call_prom_ret("call-method", 3, 2, &entry,
1091 ADDR("instantiate-rtas"),
1092 rtas_inst, base) != 0
1094 prom_printf(" failed\n");
1097 prom_printf(" done\n");
1099 reserve_mem(base, size);
1101 prom_setprop(rtas_node, "/rtas", "linux,rtas-base",
1102 &base, sizeof(base));
1103 prom_setprop(rtas_node, "/rtas", "linux,rtas-entry",
1104 &entry, sizeof(entry));
1106 prom_debug("rtas base = 0x%x\n", base);
1107 prom_debug("rtas entry = 0x%x\n", entry);
1108 prom_debug("rtas size = 0x%x\n", (long)size);
1110 prom_debug("prom_instantiate_rtas: end...\n");
1115 * Allocate room for and initialize TCE tables
1117 static void __init prom_initialize_tce_table(void)
1121 char compatible[64], type[64], model[64];
1122 char *path = RELOC(prom_scratch);
1124 u32 minalign, minsize;
1125 u64 tce_entry, *tce_entryp;
1126 u64 local_alloc_top, local_alloc_bottom;
1129 if (RELOC(ppc64_iommu_off))
1132 prom_debug("starting prom_initialize_tce_table\n");
1134 /* Cache current top of allocs so we reserve a single block */
1135 local_alloc_top = RELOC(alloc_top_high);
1136 local_alloc_bottom = local_alloc_top;
1138 /* Search all nodes looking for PHBs. */
1139 for (node = 0; prom_next_node(&node); ) {
1143 prom_getprop(node, "compatible",
1144 compatible, sizeof(compatible));
1145 prom_getprop(node, "device_type", type, sizeof(type));
1146 prom_getprop(node, "model", model, sizeof(model));
1148 if ((type[0] == 0) || (strstr(type, RELOC("pci")) == NULL))
1151 /* Keep the old logic in tack to avoid regression. */
1152 if (compatible[0] != 0) {
1153 if ((strstr(compatible, RELOC("python")) == NULL) &&
1154 (strstr(compatible, RELOC("Speedwagon")) == NULL) &&
1155 (strstr(compatible, RELOC("Winnipeg")) == NULL))
1157 } else if (model[0] != 0) {
1158 if ((strstr(model, RELOC("ython")) == NULL) &&
1159 (strstr(model, RELOC("peedwagon")) == NULL) &&
1160 (strstr(model, RELOC("innipeg")) == NULL))
1164 if (prom_getprop(node, "tce-table-minalign", &minalign,
1165 sizeof(minalign)) == PROM_ERROR)
1167 if (prom_getprop(node, "tce-table-minsize", &minsize,
1168 sizeof(minsize)) == PROM_ERROR)
1169 minsize = 4UL << 20;
1172 * Even though we read what OF wants, we just set the table
1173 * size to 4 MB. This is enough to map 2GB of PCI DMA space.
1174 * By doing this, we avoid the pitfalls of trying to DMA to
1175 * MMIO space and the DMA alias hole.
1177 * On POWER4, firmware sets the TCE region by assuming
1178 * each TCE table is 8MB. Using this memory for anything
1179 * else will impact performance, so we always allocate 8MB.
1182 if (__is_processor(PV_POWER4) || __is_processor(PV_POWER4p))
1183 minsize = 8UL << 20;
1185 minsize = 4UL << 20;
1187 /* Align to the greater of the align or size */
1188 align = max(minalign, minsize);
1189 base = alloc_down(minsize, align, 1);
1191 prom_panic("ERROR, cannot find space for TCE table.\n");
1192 if (base < local_alloc_bottom)
1193 local_alloc_bottom = base;
1195 /* It seems OF doesn't null-terminate the path :-( */
1196 memset(path, 0, sizeof(path));
1197 /* Call OF to setup the TCE hardware */
1198 if (call_prom("package-to-path", 3, 1, node,
1199 path, PROM_SCRATCH_SIZE-1) == PROM_ERROR) {
1200 prom_printf("package-to-path failed\n");
1203 /* Save away the TCE table attributes for later use. */
1204 prom_setprop(node, path, "linux,tce-base", &base, sizeof(base));
1205 prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize));
1207 prom_debug("TCE table: %s\n", path);
1208 prom_debug("\tnode = 0x%x\n", node);
1209 prom_debug("\tbase = 0x%x\n", base);
1210 prom_debug("\tsize = 0x%x\n", minsize);
1212 /* Initialize the table to have a one-to-one mapping
1213 * over the allocated size.
1215 tce_entryp = (unsigned long *)base;
1216 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) {
1217 tce_entry = (i << PAGE_SHIFT);
1219 *tce_entryp = tce_entry;
1222 prom_printf("opening PHB %s", path);
1223 phb_node = call_prom("open", 1, 1, path);
1225 prom_printf("... failed\n");
1227 prom_printf("... done\n");
1229 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
1230 phb_node, -1, minsize,
1231 (u32) base, (u32) (base >> 32));
1232 call_prom("close", 1, 0, phb_node);
1235 reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);
1237 if (RELOC(prom_memory_limit)) {
1239 * We align the start to a 16MB boundary so we can map
1240 * the TCE area using large pages if possible.
1241 * The end should be the top of RAM so no need to align it.
1243 RELOC(prom_tce_alloc_start) = _ALIGN_DOWN(local_alloc_bottom,
1245 RELOC(prom_tce_alloc_end) = local_alloc_top;
1248 /* Flag the first invalid entry */
1249 prom_debug("ending prom_initialize_tce_table\n");
1254 * With CHRP SMP we need to use the OF to start the other processors.
1255 * We can't wait until smp_boot_cpus (the OF is trashed by then)
1256 * so we have to put the processors into a holding pattern controlled
1257 * by the kernel (not OF) before we destroy the OF.
1259 * This uses a chunk of low memory, puts some holding pattern
1260 * code there and sends the other processors off to there until
1261 * smp_boot_cpus tells them to do something. The holding pattern
1262 * checks that address until its cpu # is there, when it is that
1263 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care
1264 * of setting those values.
1266 * We also use physical address 0x4 here to tell when a cpu
1267 * is in its holding pattern code.
1271 extern void __secondary_hold(void);
1272 extern unsigned long __secondary_hold_spinloop;
1273 extern unsigned long __secondary_hold_acknowledge;
1276 * We want to reference the copy of __secondary_hold_* in the
1277 * 0 - 0x100 address range
1279 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff)
1281 static void __init prom_hold_cpus(void)
1288 unsigned int interrupt_server[MAX_CPU_THREADS];
1289 unsigned int cpu_threads, hw_cpu_num;
1291 struct prom_t *_prom = &RELOC(prom);
1292 unsigned long *spinloop
1293 = (void *) LOW_ADDR(__secondary_hold_spinloop);
1294 unsigned long *acknowledge
1295 = (void *) LOW_ADDR(__secondary_hold_acknowledge);
1297 /* __secondary_hold is actually a descriptor, not the text address */
1298 unsigned long secondary_hold
1299 = __pa(*PTRRELOC((unsigned long *)__secondary_hold));
1301 unsigned long secondary_hold = LOW_ADDR(__secondary_hold);
1304 prom_debug("prom_hold_cpus: start...\n");
1305 prom_debug(" 1) spinloop = 0x%x\n", (unsigned long)spinloop);
1306 prom_debug(" 1) *spinloop = 0x%x\n", *spinloop);
1307 prom_debug(" 1) acknowledge = 0x%x\n",
1308 (unsigned long)acknowledge);
1309 prom_debug(" 1) *acknowledge = 0x%x\n", *acknowledge);
1310 prom_debug(" 1) secondary_hold = 0x%x\n", secondary_hold);
1312 /* Set the common spinloop variable, so all of the secondary cpus
1313 * will block when they are awakened from their OF spinloop.
1314 * This must occur for both SMP and non SMP kernels, since OF will
1315 * be trashed when we move the kernel.
1320 for (node = 0; prom_next_node(&node); ) {
1322 prom_getprop(node, "device_type", type, sizeof(type));
1323 if (strcmp(type, RELOC("cpu")) != 0)
1326 /* Skip non-configured cpus. */
1327 if (prom_getprop(node, "status", type, sizeof(type)) > 0)
1328 if (strcmp(type, RELOC("okay")) != 0)
1332 prom_getprop(node, "reg", ®, sizeof(reg));
1334 prom_debug("\ncpuid = 0x%x\n", cpuid);
1335 prom_debug("cpu hw idx = 0x%x\n", reg);
1337 /* Init the acknowledge var which will be reset by
1338 * the secondary cpu when it awakens from its OF
1341 *acknowledge = (unsigned long)-1;
1343 propsize = prom_getprop(node, "ibm,ppc-interrupt-server#s",
1345 sizeof(interrupt_server));
1347 /* no property. old hardware has no SMT */
1349 interrupt_server[0] = reg; /* fake it with phys id */
1351 /* We have a threaded processor */
1352 cpu_threads = propsize / sizeof(u32);
1353 if (cpu_threads > MAX_CPU_THREADS) {
1354 prom_printf("SMT: too many threads!\n"
1355 "SMT: found %x, max is %x\n",
1356 cpu_threads, MAX_CPU_THREADS);
1357 cpu_threads = 1; /* ToDo: panic? */
1361 hw_cpu_num = interrupt_server[0];
1362 if (hw_cpu_num != _prom->cpu) {
1363 /* Primary Thread of non-boot cpu */
1364 prom_printf("%x : starting cpu hw idx %x... ", cpuid, reg);
1365 call_prom("start-cpu", 3, 0, node,
1366 secondary_hold, reg);
1368 for (i = 0; (i < 100000000) &&
1369 (*acknowledge == ((unsigned long)-1)); i++ )
1372 if (*acknowledge == reg)
1373 prom_printf("done\n");
1375 prom_printf("failed: %x\n", *acknowledge);
1379 prom_printf("%x : boot cpu %x\n", cpuid, reg);
1380 #endif /* CONFIG_SMP */
1382 /* Reserve cpu #s for secondary threads. They start later. */
1383 cpuid += cpu_threads;
1386 if (cpuid > NR_CPUS)
1387 prom_printf("WARNING: maximum CPUs (" __stringify(NR_CPUS)
1388 ") exceeded: ignoring extras\n");
1390 prom_debug("prom_hold_cpus: end...\n");
1394 static void __init prom_init_client_services(unsigned long pp)
1396 struct prom_t *_prom = &RELOC(prom);
1398 /* Get a handle to the prom entry point before anything else */
1399 RELOC(prom_entry) = pp;
1401 /* get a handle for the stdout device */
1402 _prom->chosen = call_prom("finddevice", 1, 1, ADDR("/chosen"));
1403 if (!PHANDLE_VALID(_prom->chosen))
1404 prom_panic("cannot find chosen"); /* msg won't be printed :( */
1406 /* get device tree root */
1407 _prom->root = call_prom("finddevice", 1, 1, ADDR("/"));
1408 if (!PHANDLE_VALID(_prom->root))
1409 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
1416 * For really old powermacs, we need to map things we claim.
1417 * For that, we need the ihandle of the mmu.
1418 * Also, on the longtrail, we need to work around other bugs.
1420 static void __init prom_find_mmu(void)
1422 struct prom_t *_prom = &RELOC(prom);
1426 oprom = call_prom("finddevice", 1, 1, ADDR("/openprom"));
1427 if (!PHANDLE_VALID(oprom))
1429 if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0)
1431 version[sizeof(version) - 1] = 0;
1432 /* XXX might need to add other versions here */
1433 if (strcmp(version, "Open Firmware, 1.0.5") == 0)
1434 of_workarounds = OF_WA_CLAIM;
1435 else if (strncmp(version, "FirmWorks,3.", 12) == 0) {
1436 of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL;
1437 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
1440 _prom->memory = call_prom("open", 1, 1, ADDR("/memory"));
1441 prom_getprop(_prom->chosen, "mmu", &_prom->mmumap,
1442 sizeof(_prom->mmumap));
1443 if (!IHANDLE_VALID(_prom->memory) || !IHANDLE_VALID(_prom->mmumap))
1444 of_workarounds &= ~OF_WA_CLAIM; /* hmmm */
1447 #define prom_find_mmu()
1450 static void __init prom_init_stdout(void)
1452 struct prom_t *_prom = &RELOC(prom);
1453 char *path = RELOC(of_stdout_device);
1457 if (prom_getprop(_prom->chosen, "stdout", &val, sizeof(val)) <= 0)
1458 prom_panic("cannot find stdout");
1460 _prom->stdout = val;
1462 /* Get the full OF pathname of the stdout device */
1463 memset(path, 0, 256);
1464 call_prom("instance-to-path", 3, 1, _prom->stdout, path, 255);
1465 val = call_prom("instance-to-package", 1, 1, _prom->stdout);
1466 prom_setprop(_prom->chosen, "/chosen", "linux,stdout-package",
1468 prom_printf("OF stdout device is: %s\n", RELOC(of_stdout_device));
1469 prom_setprop(_prom->chosen, "/chosen", "linux,stdout-path",
1470 path, strlen(path) + 1);
1472 /* If it's a display, note it */
1473 memset(type, 0, sizeof(type));
1474 prom_getprop(val, "device_type", type, sizeof(type));
1475 if (strcmp(type, RELOC("display")) == 0)
1476 prom_setprop(val, path, "linux,boot-display", NULL, 0);
1479 static void __init prom_close_stdin(void)
1481 struct prom_t *_prom = &RELOC(prom);
1484 if (prom_getprop(_prom->chosen, "stdin", &val, sizeof(val)) > 0)
1485 call_prom("close", 1, 0, val);
1488 static int __init prom_find_machine_type(void)
1490 struct prom_t *_prom = &RELOC(prom);
1496 len = prom_getprop(_prom->root, "compatible",
1497 compat, sizeof(compat)-1);
1501 char *p = &compat[i];
1505 if (strstr(p, RELOC("Power Macintosh")) ||
1506 strstr(p, RELOC("MacRISC")))
1507 return PLATFORM_POWERMAC;
1509 if (strstr(p, RELOC("Momentum,Maple")))
1510 return PLATFORM_MAPLE;
1511 if (strstr(p, RELOC("IBM,CPB")))
1512 return PLATFORM_CELL;
1518 /* Default to pSeries. We need to know if we are running LPAR */
1519 rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1520 if (PHANDLE_VALID(rtas)) {
1521 int x = prom_getproplen(rtas, "ibm,hypertas-functions");
1522 if (x != PROM_ERROR) {
1523 prom_printf("Hypertas detected, assuming LPAR !\n");
1524 return PLATFORM_PSERIES_LPAR;
1527 return PLATFORM_PSERIES;
1529 return PLATFORM_CHRP;
1533 static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
1535 return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);
1539 * If we have a display that we don't know how to drive,
1540 * we will want to try to execute OF's open method for it
1541 * later. However, OF will probably fall over if we do that
1542 * we've taken over the MMU.
1543 * So we check whether we will need to open the display,
1544 * and if so, open it now.
1546 static void __init prom_check_displays(void)
1548 char type[16], *path;
1553 static unsigned char default_colors[] = {
1571 const unsigned char *clut;
1573 prom_printf("Looking for displays\n");
1574 for (node = 0; prom_next_node(&node); ) {
1575 memset(type, 0, sizeof(type));
1576 prom_getprop(node, "device_type", type, sizeof(type));
1577 if (strcmp(type, RELOC("display")) != 0)
1580 /* It seems OF doesn't null-terminate the path :-( */
1581 path = RELOC(prom_scratch);
1582 memset(path, 0, PROM_SCRATCH_SIZE);
1585 * leave some room at the end of the path for appending extra
1588 if (call_prom("package-to-path", 3, 1, node, path,
1589 PROM_SCRATCH_SIZE-10) == PROM_ERROR)
1591 prom_printf("found display : %s, opening ... ", path);
1593 ih = call_prom("open", 1, 1, path);
1595 prom_printf("failed\n");
1600 prom_printf("done\n");
1601 prom_setprop(node, path, "linux,opened", NULL, 0);
1603 /* Setup a usable color table when the appropriate
1604 * method is available. Should update this to set-colors */
1605 clut = RELOC(default_colors);
1606 for (i = 0; i < 32; i++, clut += 3)
1607 if (prom_set_color(ih, i, clut[0], clut[1],
1611 #ifdef CONFIG_LOGO_LINUX_CLUT224
1612 clut = PTRRELOC(RELOC(logo_linux_clut224.clut));
1613 for (i = 0; i < RELOC(logo_linux_clut224.clutsize); i++, clut += 3)
1614 if (prom_set_color(ih, i + 32, clut[0], clut[1],
1617 #endif /* CONFIG_LOGO_LINUX_CLUT224 */
1622 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */
1623 static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end,
1624 unsigned long needed, unsigned long align)
1628 *mem_start = _ALIGN(*mem_start, align);
1629 while ((*mem_start + needed) > *mem_end) {
1630 unsigned long room, chunk;
1632 prom_debug("Chunk exhausted, claiming more at %x...\n",
1633 RELOC(alloc_bottom));
1634 room = RELOC(alloc_top) - RELOC(alloc_bottom);
1635 if (room > DEVTREE_CHUNK_SIZE)
1636 room = DEVTREE_CHUNK_SIZE;
1637 if (room < PAGE_SIZE)
1638 prom_panic("No memory for flatten_device_tree (no room)");
1639 chunk = alloc_up(room, 0);
1641 prom_panic("No memory for flatten_device_tree (claim failed)");
1642 *mem_end = RELOC(alloc_top);
1645 ret = (void *)*mem_start;
1646 *mem_start += needed;
1651 #define dt_push_token(token, mem_start, mem_end) \
1652 do { *((u32 *)make_room(mem_start, mem_end, 4, 4)) = token; } while(0)
1654 static unsigned long __init dt_find_string(char *str)
1658 s = os = (char *)RELOC(dt_string_start);
1660 while (s < (char *)RELOC(dt_string_end)) {
1661 if (strcmp(s, str) == 0)
1669 * The Open Firmware 1275 specification states properties must be 31 bytes or
1670 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
1672 #define MAX_PROPERTY_NAME 64
1674 static void __init scan_dt_build_strings(phandle node,
1675 unsigned long *mem_start,
1676 unsigned long *mem_end)
1678 char *prev_name, *namep, *sstart;
1682 sstart = (char *)RELOC(dt_string_start);
1684 /* get and store all property names */
1685 prev_name = RELOC("");
1687 /* 64 is max len of name including nul. */
1688 namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1);
1689 if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) {
1690 /* No more nodes: unwind alloc */
1691 *mem_start = (unsigned long)namep;
1696 if (strcmp(namep, RELOC("name")) == 0) {
1697 *mem_start = (unsigned long)namep;
1698 prev_name = RELOC("name");
1701 /* get/create string entry */
1702 soff = dt_find_string(namep);
1704 *mem_start = (unsigned long)namep;
1705 namep = sstart + soff;
1707 /* Trim off some if we can */
1708 *mem_start = (unsigned long)namep + strlen(namep) + 1;
1709 RELOC(dt_string_end) = *mem_start;
1714 /* do all our children */
1715 child = call_prom("child", 1, 1, node);
1716 while (child != 0) {
1717 scan_dt_build_strings(child, mem_start, mem_end);
1718 child = call_prom("peer", 1, 1, child);
1722 static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
1723 unsigned long *mem_end)
1726 char *namep, *prev_name, *sstart, *p, *ep, *lp, *path;
1728 unsigned char *valp;
1729 static char pname[MAX_PROPERTY_NAME];
1732 dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);
1734 /* get the node's full name */
1735 namep = (char *)*mem_start;
1736 room = *mem_end - *mem_start;
1739 l = call_prom("package-to-path", 3, 1, node, namep, room);
1741 /* Didn't fit? Get more room. */
1743 if (l >= *mem_end - *mem_start)
1744 namep = make_room(mem_start, mem_end, l+1, 1);
1745 call_prom("package-to-path", 3, 1, node, namep, l);
1749 /* Fixup an Apple bug where they have bogus \0 chars in the
1750 * middle of the path in some properties, and extract
1751 * the unit name (everything after the last '/').
1753 for (lp = p = namep, ep = namep + l; p < ep; p++) {
1760 *mem_start = _ALIGN((unsigned long)lp + 1, 4);
1763 /* get it again for debugging */
1764 path = RELOC(prom_scratch);
1765 memset(path, 0, PROM_SCRATCH_SIZE);
1766 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
1768 /* get and store all properties */
1769 prev_name = RELOC("");
1770 sstart = (char *)RELOC(dt_string_start);
1772 if (call_prom("nextprop", 3, 1, node, prev_name,
1777 if (strcmp(RELOC(pname), RELOC("name")) == 0) {
1778 prev_name = RELOC("name");
1782 /* find string offset */
1783 soff = dt_find_string(RELOC(pname));
1785 prom_printf("WARNING: Can't find string index for"
1786 " <%s>, node %s\n", RELOC(pname), path);
1789 prev_name = sstart + soff;
1792 l = call_prom("getproplen", 2, 1, node, RELOC(pname));
1795 if (l == PROM_ERROR)
1797 if (l > MAX_PROPERTY_LENGTH) {
1798 prom_printf("WARNING: ignoring large property ");
1799 /* It seems OF doesn't null-terminate the path :-( */
1800 prom_printf("[%s] ", path);
1801 prom_printf("%s length 0x%x\n", RELOC(pname), l);
1805 /* push property head */
1806 dt_push_token(OF_DT_PROP, mem_start, mem_end);
1807 dt_push_token(l, mem_start, mem_end);
1808 dt_push_token(soff, mem_start, mem_end);
1810 /* push property content */
1811 valp = make_room(mem_start, mem_end, l, 4);
1812 call_prom("getprop", 4, 1, node, RELOC(pname), valp, l);
1813 *mem_start = _ALIGN(*mem_start, 4);
1816 /* Add a "linux,phandle" property. */
1817 soff = dt_find_string(RELOC("linux,phandle"));
1819 prom_printf("WARNING: Can't find string index for"
1820 " <linux-phandle> node %s\n", path);
1822 dt_push_token(OF_DT_PROP, mem_start, mem_end);
1823 dt_push_token(4, mem_start, mem_end);
1824 dt_push_token(soff, mem_start, mem_end);
1825 valp = make_room(mem_start, mem_end, 4, 4);
1826 *(u32 *)valp = node;
1829 /* do all our children */
1830 child = call_prom("child", 1, 1, node);
1831 while (child != 0) {
1832 scan_dt_build_struct(child, mem_start, mem_end);
1833 child = call_prom("peer", 1, 1, child);
1836 dt_push_token(OF_DT_END_NODE, mem_start, mem_end);
1839 static void __init flatten_device_tree(void)
1842 unsigned long mem_start, mem_end, room;
1843 struct boot_param_header *hdr;
1844 struct prom_t *_prom = &RELOC(prom);
1849 * Check how much room we have between alloc top & bottom (+/- a
1850 * few pages), crop to 4Mb, as this is our "chuck" size
1852 room = RELOC(alloc_top) - RELOC(alloc_bottom) - 0x4000;
1853 if (room > DEVTREE_CHUNK_SIZE)
1854 room = DEVTREE_CHUNK_SIZE;
1855 prom_debug("starting device tree allocs at %x\n", RELOC(alloc_bottom));
1857 /* Now try to claim that */
1858 mem_start = (unsigned long)alloc_up(room, PAGE_SIZE);
1860 prom_panic("Can't allocate initial device-tree chunk\n");
1861 mem_end = RELOC(alloc_top);
1863 /* Get root of tree */
1864 root = call_prom("peer", 1, 1, (phandle)0);
1865 if (root == (phandle)0)
1866 prom_panic ("couldn't get device tree root\n");
1868 /* Build header and make room for mem rsv map */
1869 mem_start = _ALIGN(mem_start, 4);
1870 hdr = make_room(&mem_start, &mem_end,
1871 sizeof(struct boot_param_header), 4);
1872 RELOC(dt_header_start) = (unsigned long)hdr;
1873 rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8);
1875 /* Start of strings */
1876 mem_start = PAGE_ALIGN(mem_start);
1877 RELOC(dt_string_start) = mem_start;
1878 mem_start += 4; /* hole */
1880 /* Add "linux,phandle" in there, we'll need it */
1881 namep = make_room(&mem_start, &mem_end, 16, 1);
1882 strcpy(namep, RELOC("linux,phandle"));
1883 mem_start = (unsigned long)namep + strlen(namep) + 1;
1885 /* Build string array */
1886 prom_printf("Building dt strings...\n");
1887 scan_dt_build_strings(root, &mem_start, &mem_end);
1888 RELOC(dt_string_end) = mem_start;
1890 /* Build structure */
1891 mem_start = PAGE_ALIGN(mem_start);
1892 RELOC(dt_struct_start) = mem_start;
1893 prom_printf("Building dt structure...\n");
1894 scan_dt_build_struct(root, &mem_start, &mem_end);
1895 dt_push_token(OF_DT_END, &mem_start, &mem_end);
1896 RELOC(dt_struct_end) = PAGE_ALIGN(mem_start);
1899 hdr->boot_cpuid_phys = _prom->cpu;
1900 hdr->magic = OF_DT_HEADER;
1901 hdr->totalsize = RELOC(dt_struct_end) - RELOC(dt_header_start);
1902 hdr->off_dt_struct = RELOC(dt_struct_start) - RELOC(dt_header_start);
1903 hdr->off_dt_strings = RELOC(dt_string_start) - RELOC(dt_header_start);
1904 hdr->dt_strings_size = RELOC(dt_string_end) - RELOC(dt_string_start);
1905 hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - RELOC(dt_header_start);
1906 hdr->version = OF_DT_VERSION;
1907 /* Version 16 is not backward compatible */
1908 hdr->last_comp_version = 0x10;
1910 /* Reserve the whole thing and copy the reserve map in, we
1911 * also bump mem_reserve_cnt to cause further reservations to
1912 * fail since it's too late.
1914 reserve_mem(RELOC(dt_header_start), hdr->totalsize);
1915 memcpy(rsvmap, RELOC(mem_reserve_map), sizeof(mem_reserve_map));
1920 prom_printf("reserved memory map:\n");
1921 for (i = 0; i < RELOC(mem_reserve_cnt); i++)
1922 prom_printf(" %x - %x\n",
1923 RELOC(mem_reserve_map)[i].base,
1924 RELOC(mem_reserve_map)[i].size);
1927 RELOC(mem_reserve_cnt) = MEM_RESERVE_MAP_SIZE;
1929 prom_printf("Device tree strings 0x%x -> 0x%x\n",
1930 RELOC(dt_string_start), RELOC(dt_string_end));
1931 prom_printf("Device tree struct 0x%x -> 0x%x\n",
1932 RELOC(dt_struct_start), RELOC(dt_struct_end));
1937 static void __init fixup_device_tree(void)
1939 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
1940 phandle u3, i2c, mpic;
1945 /* Some G5s have a missing interrupt definition, fix it up here */
1946 u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
1947 if (!PHANDLE_VALID(u3))
1949 i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
1950 if (!PHANDLE_VALID(i2c))
1952 mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
1953 if (!PHANDLE_VALID(mpic))
1956 /* check if proper rev of u3 */
1957 if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev))
1960 if (u3_rev < 0x35 || u3_rev > 0x39)
1962 /* does it need fixup ? */
1963 if (prom_getproplen(i2c, "interrupts") > 0)
1966 prom_printf("fixing up bogus interrupts for u3 i2c...\n");
1968 /* interrupt on this revision of u3 is number 0 and level */
1971 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts",
1972 &interrupts, sizeof(interrupts));
1974 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
1975 &parent, sizeof(parent));
1980 static void __init prom_find_boot_cpu(void)
1982 struct prom_t *_prom = &RELOC(prom);
1988 if (prom_getprop(_prom->chosen, "cpu", &prom_cpu, sizeof(prom_cpu)) <= 0)
1991 cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);
1993 prom_getprop(cpu_pkg, "reg", &getprop_rval, sizeof(getprop_rval));
1994 _prom->cpu = getprop_rval;
1996 prom_debug("Booting CPU hw index = 0x%x\n", _prom->cpu);
1999 static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
2001 #ifdef CONFIG_BLK_DEV_INITRD
2002 struct prom_t *_prom = &RELOC(prom);
2004 if (r3 && r4 && r4 != 0xdeadbeef) {
2007 RELOC(prom_initrd_start) = is_kernel_addr(r3) ? __pa(r3) : r3;
2008 RELOC(prom_initrd_end) = RELOC(prom_initrd_start) + r4;
2010 val = RELOC(prom_initrd_start);
2011 prom_setprop(_prom->chosen, "/chosen", "linux,initrd-start",
2013 val = RELOC(prom_initrd_end);
2014 prom_setprop(_prom->chosen, "/chosen", "linux,initrd-end",
2017 reserve_mem(RELOC(prom_initrd_start),
2018 RELOC(prom_initrd_end) - RELOC(prom_initrd_start));
2020 prom_debug("initrd_start=0x%x\n", RELOC(prom_initrd_start));
2021 prom_debug("initrd_end=0x%x\n", RELOC(prom_initrd_end));
2023 #endif /* CONFIG_BLK_DEV_INITRD */
2027 * We enter here early on, when the Open Firmware prom is still
2028 * handling exceptions and the MMU hash table for us.
2031 unsigned long __init prom_init(unsigned long r3, unsigned long r4,
2033 unsigned long r6, unsigned long r7)
2035 struct prom_t *_prom;
2038 unsigned long offset = reloc_offset();
2044 _prom = &RELOC(prom);
2047 * First zero the BSS
2049 memset(&RELOC(__bss_start), 0, __bss_stop - __bss_start);
2052 * Init interface to Open Firmware, get some node references,
2055 prom_init_client_services(pp);
2058 * See if this OF is old enough that we need to do explicit maps
2059 * and other workarounds
2064 * Init prom stdout device
2069 * Get default machine type. At this point, we do not differentiate
2070 * between pSeries SMP and pSeries LPAR
2072 RELOC(of_platform) = prom_find_machine_type();
2073 getprop_rval = RELOC(of_platform);
2074 prom_setprop(_prom->chosen, "/chosen", "linux,platform",
2075 &getprop_rval, sizeof(getprop_rval));
2077 /* Bail if this is a kdump kernel. */
2078 if (PHYSICAL_START > 0)
2079 prom_panic("Error: You can't boot a kdump kernel from OF!\n");
2082 * Check for an initrd
2084 prom_check_initrd(r3, r4);
2086 #ifdef CONFIG_PPC_PSERIES
2088 * On pSeries, inform the firmware about our capabilities
2090 if (RELOC(of_platform) == PLATFORM_PSERIES ||
2091 RELOC(of_platform) == PLATFORM_PSERIES_LPAR)
2092 prom_send_capabilities();
2096 * Copy the CPU hold code
2098 if (RELOC(of_platform) != PLATFORM_POWERMAC)
2099 copy_and_flush(0, KERNELBASE + offset, 0x100, 0);
2102 * Do early parsing of command line
2104 early_cmdline_parse();
2107 * Initialize memory management within prom_init
2112 if (RELOC(prom_crashk_base))
2113 reserve_mem(RELOC(prom_crashk_base), RELOC(prom_crashk_size));
2116 * Determine which cpu is actually running right _now_
2118 prom_find_boot_cpu();
2121 * Initialize display devices
2123 prom_check_displays();
2127 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
2128 * that uses the allocator, we need to make sure we get the top of memory
2129 * available for us here...
2131 if (RELOC(of_platform) == PLATFORM_PSERIES)
2132 prom_initialize_tce_table();
2136 * On non-powermacs, try to instantiate RTAS and puts all CPUs
2137 * in spin-loops. PowerMacs don't have a working RTAS and use
2138 * a different way to spin CPUs
2140 if (RELOC(of_platform) != PLATFORM_POWERMAC) {
2141 prom_instantiate_rtas();
2146 * Fill in some infos for use by the kernel later on
2148 if (RELOC(prom_memory_limit))
2149 prom_setprop(_prom->chosen, "/chosen", "linux,memory-limit",
2150 &RELOC(prom_memory_limit),
2151 sizeof(prom_memory_limit));
2153 if (RELOC(ppc64_iommu_off))
2154 prom_setprop(_prom->chosen, "/chosen", "linux,iommu-off",
2157 if (RELOC(iommu_force_on))
2158 prom_setprop(_prom->chosen, "/chosen", "linux,iommu-force-on",
2161 if (RELOC(prom_tce_alloc_start)) {
2162 prom_setprop(_prom->chosen, "/chosen", "linux,tce-alloc-start",
2163 &RELOC(prom_tce_alloc_start),
2164 sizeof(prom_tce_alloc_start));
2165 prom_setprop(_prom->chosen, "/chosen", "linux,tce-alloc-end",
2166 &RELOC(prom_tce_alloc_end),
2167 sizeof(prom_tce_alloc_end));
2172 if (RELOC(prom_crashk_base)) {
2173 prom_setprop(_prom->chosen, "/chosen", "linux,crashkernel-base",
2174 PTRRELOC(&prom_crashk_base),
2175 sizeof(RELOC(prom_crashk_base)));
2176 prom_setprop(_prom->chosen, "/chosen", "linux,crashkernel-size",
2177 PTRRELOC(&prom_crashk_size),
2178 sizeof(RELOC(prom_crashk_size)));
2182 * Fixup any known bugs in the device-tree
2184 fixup_device_tree();
2187 * Now finally create the flattened device-tree
2189 prom_printf("copying OF device tree ...\n");
2190 flatten_device_tree();
2193 * in case stdin is USB and still active on IBM machines...
2194 * Unfortunately quiesce crashes on some powermacs if we have
2195 * closed stdin already (in particular the powerbook 101).
2197 if (RELOC(of_platform) != PLATFORM_POWERMAC)
2201 * Call OF "quiesce" method to shut down pending DMA's from
2204 prom_printf("Calling quiesce ...\n");
2205 call_prom("quiesce", 0, 0);
2208 * And finally, call the kernel passing it the flattened device
2209 * tree and NULL as r5, thus triggering the new entry point which
2210 * is common to us and kexec
2212 hdr = RELOC(dt_header_start);
2213 prom_printf("returning from prom_init\n");
2214 prom_debug("->dt_header_start=0x%x\n", hdr);
2217 reloc_got2(-offset);
2220 __start(hdr, KERNELBASE + offset, 0);