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
212 unsigned int threadid;
213 } hmt_thread_data[NR_CPUS];
214 #endif /* CONFIG_HMT */
217 * Error results ... some OF calls will return "-1" on error, some
218 * will return 0, some will return either. To simplify, here are
219 * macros to use with any ihandle or phandle return value to check if
223 #define PROM_ERROR (-1u)
224 #define PHANDLE_VALID(p) ((p) != 0 && (p) != PROM_ERROR)
225 #define IHANDLE_VALID(i) ((i) != 0 && (i) != PROM_ERROR)
228 /* This is the one and *ONLY* place where we actually call open
232 static int __init call_prom(const char *service, int nargs, int nret, ...)
235 struct prom_args args;
238 args.service = ADDR(service);
242 va_start(list, nret);
243 for (i = 0; i < nargs; i++)
244 args.args[i] = va_arg(list, prom_arg_t);
247 for (i = 0; i < nret; i++)
248 args.args[nargs+i] = 0;
250 if (enter_prom(&args, RELOC(prom_entry)) < 0)
253 return (nret > 0) ? args.args[nargs] : 0;
256 static int __init call_prom_ret(const char *service, int nargs, int nret,
257 prom_arg_t *rets, ...)
260 struct prom_args args;
263 args.service = ADDR(service);
267 va_start(list, rets);
268 for (i = 0; i < nargs; i++)
269 args.args[i] = va_arg(list, prom_arg_t);
272 for (i = 0; i < nret; i++)
273 args.args[nargs+i] = 0;
275 if (enter_prom(&args, RELOC(prom_entry)) < 0)
279 for (i = 1; i < nret; ++i)
280 rets[i-1] = args.args[nargs+i];
282 return (nret > 0) ? args.args[nargs] : 0;
286 static void __init prom_print(const char *msg)
289 struct prom_t *_prom = &RELOC(prom);
291 if (_prom->stdout == 0)
294 for (p = msg; *p != 0; p = q) {
295 for (q = p; *q != 0 && *q != '\n'; ++q)
298 call_prom("write", 3, 1, _prom->stdout, p, q - p);
302 call_prom("write", 3, 1, _prom->stdout, ADDR("\r\n"), 2);
307 static void __init prom_print_hex(unsigned long val)
309 int i, nibbles = sizeof(val)*2;
310 char buf[sizeof(val)*2+1];
311 struct prom_t *_prom = &RELOC(prom);
313 for (i = nibbles-1; i >= 0; i--) {
314 buf[i] = (val & 0xf) + '0';
316 buf[i] += ('a'-'0'-10);
320 call_prom("write", 3, 1, _prom->stdout, buf, nibbles);
324 static void __init prom_printf(const char *format, ...)
326 const char *p, *q, *s;
329 struct prom_t *_prom = &RELOC(prom);
331 va_start(args, format);
333 format = PTRRELOC(format);
335 for (p = format; *p != 0; p = q) {
336 for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
339 call_prom("write", 3, 1, _prom->stdout, p, q - p);
344 call_prom("write", 3, 1, _prom->stdout,
354 s = va_arg(args, const char *);
359 v = va_arg(args, unsigned long);
367 static unsigned int __init prom_claim(unsigned long virt, unsigned long size,
370 struct prom_t *_prom = &RELOC(prom);
372 if (align == 0 && (OF_WORKAROUNDS & OF_WA_CLAIM)) {
374 * Old OF requires we claim physical and virtual separately
375 * and then map explicitly (assuming virtual mode)
380 ret = call_prom_ret("call-method", 5, 2, &result,
381 ADDR("claim"), _prom->memory,
383 if (ret != 0 || result == -1)
385 ret = call_prom_ret("call-method", 5, 2, &result,
386 ADDR("claim"), _prom->mmumap,
389 call_prom("call-method", 4, 1, ADDR("release"),
390 _prom->memory, size, virt);
393 /* the 0x12 is M (coherence) + PP == read/write */
394 call_prom("call-method", 6, 1,
395 ADDR("map"), _prom->mmumap, 0x12, size, virt, virt);
398 return call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size,
402 static void __init __attribute__((noreturn)) prom_panic(const char *reason)
405 reason = PTRRELOC(reason);
408 /* ToDo: should put up an SRC here on p/iSeries */
409 call_prom("exit", 0, 0);
411 for (;;) /* should never get here */
416 static int __init prom_next_node(phandle *nodep)
420 if ((node = *nodep) != 0
421 && (*nodep = call_prom("child", 1, 1, node)) != 0)
423 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
426 if ((node = call_prom("parent", 1, 1, node)) == 0)
428 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
433 static int inline prom_getprop(phandle node, const char *pname,
434 void *value, size_t valuelen)
436 return call_prom("getprop", 4, 1, node, ADDR(pname),
437 (u32)(unsigned long) value, (u32) valuelen);
440 static int inline prom_getproplen(phandle node, const char *pname)
442 return call_prom("getproplen", 2, 1, node, ADDR(pname));
445 static void add_string(char **str, const char *q)
455 static char *tohex(unsigned int x)
457 static char digits[] = "0123456789abcdef";
458 static char result[9];
465 result[i] = digits[x & 0xf];
467 } while (x != 0 && i > 0);
471 static int __init prom_setprop(phandle node, const char *nodename,
472 const char *pname, void *value, size_t valuelen)
476 if (!(OF_WORKAROUNDS & OF_WA_LONGTRAIL))
477 return call_prom("setprop", 4, 1, node, ADDR(pname),
478 (u32)(unsigned long) value, (u32) valuelen);
480 /* gah... setprop doesn't work on longtrail, have to use interpret */
482 add_string(&p, "dev");
483 add_string(&p, nodename);
484 add_string(&p, tohex((u32)(unsigned long) value));
485 add_string(&p, tohex(valuelen));
486 add_string(&p, tohex(ADDR(pname)));
487 add_string(&p, tohex(strlen(RELOC(pname))));
488 add_string(&p, "property");
490 return call_prom("interpret", 1, 1, (u32)(unsigned long) cmd);
493 /* We can't use the standard versions because of RELOC headaches. */
494 #define isxdigit(c) (('0' <= (c) && (c) <= '9') \
495 || ('a' <= (c) && (c) <= 'f') \
496 || ('A' <= (c) && (c) <= 'F'))
498 #define isdigit(c) ('0' <= (c) && (c) <= '9')
499 #define islower(c) ('a' <= (c) && (c) <= 'z')
500 #define toupper(c) (islower(c) ? ((c) - 'a' + 'A') : (c))
502 unsigned long prom_strtoul(const char *cp, const char **endp)
504 unsigned long result = 0, base = 10, value;
509 if (toupper(*cp) == 'X') {
515 while (isxdigit(*cp) &&
516 (value = isdigit(*cp) ? *cp - '0' : toupper(*cp) - 'A' + 10) < base) {
517 result = result * base + value;
527 unsigned long prom_memparse(const char *ptr, const char **retptr)
529 unsigned long ret = prom_strtoul(ptr, retptr);
533 * We can't use a switch here because GCC *may* generate a
534 * jump table which won't work, because we're not running at
535 * the address we're linked at.
537 if ('G' == **retptr || 'g' == **retptr)
540 if ('M' == **retptr || 'm' == **retptr)
543 if ('K' == **retptr || 'k' == **retptr)
555 * Early parsing of the command line passed to the kernel, used for
556 * "mem=x" and the options that affect the iommu
558 static void __init early_cmdline_parse(void)
560 struct prom_t *_prom = &RELOC(prom);
565 RELOC(prom_cmd_line[0]) = 0;
566 p = RELOC(prom_cmd_line);
567 if ((long)_prom->chosen > 0)
568 l = prom_getprop(_prom->chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
569 #ifdef CONFIG_CMDLINE
570 if (l == 0) /* dbl check */
571 strlcpy(RELOC(prom_cmd_line),
572 RELOC(CONFIG_CMDLINE), sizeof(prom_cmd_line));
573 #endif /* CONFIG_CMDLINE */
574 prom_printf("command line: %s\n", RELOC(prom_cmd_line));
577 opt = strstr(RELOC(prom_cmd_line), RELOC("iommu="));
579 prom_printf("iommu opt is: %s\n", opt);
581 while (*opt && *opt == ' ')
583 if (!strncmp(opt, RELOC("off"), 3))
584 RELOC(ppc64_iommu_off) = 1;
585 else if (!strncmp(opt, RELOC("force"), 5))
586 RELOC(iommu_force_on) = 1;
590 opt = strstr(RELOC(prom_cmd_line), RELOC("mem="));
593 RELOC(prom_memory_limit) = prom_memparse(opt, (const char **)&opt);
595 /* Align to 16 MB == size of ppc64 large page */
596 RELOC(prom_memory_limit) = ALIGN(RELOC(prom_memory_limit), 0x1000000);
602 * crashkernel=size@addr specifies the location to reserve for
605 opt = strstr(RELOC(prom_cmd_line), RELOC("crashkernel="));
608 RELOC(prom_crashk_size) = prom_memparse(opt, &opt);
610 if (ALIGN(RELOC(prom_crashk_size), 0x1000000) !=
611 RELOC(prom_crashk_size)) {
612 prom_printf("Warning: crashkernel size is not "
613 "aligned to 16MB\n");
617 * At present, the crash kernel always run at 32MB.
618 * Just ignore whatever user passed.
620 RELOC(prom_crashk_base) = 0x2000000;
622 prom_printf("Warning: PPC64 kdump kernel always runs "
629 #ifdef CONFIG_PPC_PSERIES
631 * To tell the firmware what our capabilities are, we have to pass
632 * it a fake 32-bit ELF header containing a couple of PT_NOTE sections
633 * that contain structures that contain the actual values.
635 static struct fake_elf {
642 char name[8]; /* "PowerPC" */
656 char name[24]; /* "IBM,RPA-Client-Config" */
670 .e_ident = { 0x7f, 'E', 'L', 'F',
671 ELFCLASS32, ELFDATA2MSB, EV_CURRENT },
672 .e_type = ET_EXEC, /* yeah right */
674 .e_version = EV_CURRENT,
675 .e_phoff = offsetof(struct fake_elf, phdr),
676 .e_phentsize = sizeof(Elf32_Phdr),
682 .p_offset = offsetof(struct fake_elf, chrpnote),
683 .p_filesz = sizeof(struct chrpnote)
686 .p_offset = offsetof(struct fake_elf, rpanote),
687 .p_filesz = sizeof(struct rpanote)
691 .namesz = sizeof("PowerPC"),
692 .descsz = sizeof(struct chrpdesc),
696 .real_mode = ~0U, /* ~0 means "don't care" */
705 .namesz = sizeof("IBM,RPA-Client-Config"),
706 .descsz = sizeof(struct rpadesc),
708 .name = "IBM,RPA-Client-Config",
711 .min_rmo_size = 64, /* in megabytes */
712 .min_rmo_percent = 0,
713 .max_pft_size = 48, /* 2^48 bytes max PFT size */
721 static void __init prom_send_capabilities(void)
725 elfloader = call_prom("open", 1, 1, ADDR("/packages/elf-loader"));
726 if (elfloader == 0) {
727 prom_printf("couldn't open /packages/elf-loader\n");
730 call_prom("call-method", 3, 1, ADDR("process-elf-header"),
731 elfloader, ADDR(&fake_elf));
732 call_prom("close", 1, 0, elfloader);
737 * Memory allocation strategy... our layout is normally:
739 * at 14Mb or more we have vmlinux, then a gap and initrd. In some
740 * rare cases, initrd might end up being before the kernel though.
741 * We assume this won't override the final kernel at 0, we have no
742 * provision to handle that in this version, but it should hopefully
745 * alloc_top is set to the top of RMO, eventually shrink down if the
748 * alloc_bottom is set to the top of kernel/initrd
750 * from there, allocations are done this way : rtas is allocated
751 * topmost, and the device-tree is allocated from the bottom. We try
752 * to grow the device-tree allocation as we progress. If we can't,
753 * then we fail, we don't currently have a facility to restart
754 * elsewhere, but that shouldn't be necessary.
756 * Note that calls to reserve_mem have to be done explicitly, memory
757 * allocated with either alloc_up or alloc_down isn't automatically
763 * Allocates memory in the RMO upward from the kernel/initrd
765 * When align is 0, this is a special case, it means to allocate in place
766 * at the current location of alloc_bottom or fail (that is basically
767 * extending the previous allocation). Used for the device-tree flattening
769 static unsigned long __init alloc_up(unsigned long size, unsigned long align)
771 unsigned long base = RELOC(alloc_bottom);
772 unsigned long addr = 0;
775 base = _ALIGN_UP(base, align);
776 prom_debug("alloc_up(%x, %x)\n", size, align);
777 if (RELOC(ram_top) == 0)
778 prom_panic("alloc_up() called with mem not initialized\n");
781 base = _ALIGN_UP(RELOC(alloc_bottom), align);
783 base = RELOC(alloc_bottom);
785 for(; (base + size) <= RELOC(alloc_top);
786 base = _ALIGN_UP(base + 0x100000, align)) {
787 prom_debug(" trying: 0x%x\n\r", base);
788 addr = (unsigned long)prom_claim(base, size, 0);
789 if (addr != PROM_ERROR && addr != 0)
797 RELOC(alloc_bottom) = addr;
799 prom_debug(" -> %x\n", addr);
800 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom));
801 prom_debug(" alloc_top : %x\n", RELOC(alloc_top));
802 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
803 prom_debug(" rmo_top : %x\n", RELOC(rmo_top));
804 prom_debug(" ram_top : %x\n", RELOC(ram_top));
810 * Allocates memory downward, either from top of RMO, or if highmem
811 * is set, from the top of RAM. Note that this one doesn't handle
812 * failures. It does claim memory if highmem is not set.
814 static unsigned long __init alloc_down(unsigned long size, unsigned long align,
817 unsigned long base, addr = 0;
819 prom_debug("alloc_down(%x, %x, %s)\n", size, align,
820 highmem ? RELOC("(high)") : RELOC("(low)"));
821 if (RELOC(ram_top) == 0)
822 prom_panic("alloc_down() called with mem not initialized\n");
825 /* Carve out storage for the TCE table. */
826 addr = _ALIGN_DOWN(RELOC(alloc_top_high) - size, align);
827 if (addr <= RELOC(alloc_bottom))
829 /* Will we bump into the RMO ? If yes, check out that we
830 * didn't overlap existing allocations there, if we did,
831 * we are dead, we must be the first in town !
833 if (addr < RELOC(rmo_top)) {
834 /* Good, we are first */
835 if (RELOC(alloc_top) == RELOC(rmo_top))
836 RELOC(alloc_top) = RELOC(rmo_top) = addr;
840 RELOC(alloc_top_high) = addr;
844 base = _ALIGN_DOWN(RELOC(alloc_top) - size, align);
845 for (; base > RELOC(alloc_bottom);
846 base = _ALIGN_DOWN(base - 0x100000, align)) {
847 prom_debug(" trying: 0x%x\n\r", base);
848 addr = (unsigned long)prom_claim(base, size, 0);
849 if (addr != PROM_ERROR && addr != 0)
855 RELOC(alloc_top) = addr;
858 prom_debug(" -> %x\n", addr);
859 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom));
860 prom_debug(" alloc_top : %x\n", RELOC(alloc_top));
861 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
862 prom_debug(" rmo_top : %x\n", RELOC(rmo_top));
863 prom_debug(" ram_top : %x\n", RELOC(ram_top));
871 static unsigned long __init prom_next_cell(int s, cell_t **cellp)
876 /* Ignore more than 2 cells */
877 while (s > sizeof(unsigned long) / 4) {
893 * Very dumb function for adding to the memory reserve list, but
894 * we don't need anything smarter at this point
896 * XXX Eventually check for collisions. They should NEVER happen.
897 * If problems seem to show up, it would be a good start to track
900 static void reserve_mem(unsigned long base, unsigned long size)
902 unsigned long top = base + size;
903 unsigned long cnt = RELOC(mem_reserve_cnt);
908 /* We need to always keep one empty entry so that we
909 * have our terminator with "size" set to 0 since we are
910 * dumb and just copy this entire array to the boot params
912 base = _ALIGN_DOWN(base, PAGE_SIZE);
913 top = _ALIGN_UP(top, PAGE_SIZE);
916 if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))
917 prom_panic("Memory reserve map exhausted !\n");
918 RELOC(mem_reserve_map)[cnt].base = base;
919 RELOC(mem_reserve_map)[cnt].size = size;
920 RELOC(mem_reserve_cnt) = cnt + 1;
924 * Initialize memory allocation mecanism, parse "memory" nodes and
925 * obtain that way the top of memory and RMO to setup out local allocator
927 static void __init prom_init_mem(void)
930 char *path, type[64];
933 struct prom_t *_prom = &RELOC(prom);
937 * We iterate the memory nodes to find
938 * 1) top of RMO (first node)
942 prom_getprop(_prom->root, "#address-cells", &rac, sizeof(rac));
944 prom_getprop(_prom->root, "#size-cells", &rsc, sizeof(rsc));
945 prom_debug("root_addr_cells: %x\n", (unsigned long) rac);
946 prom_debug("root_size_cells: %x\n", (unsigned long) rsc);
948 prom_debug("scanning memory:\n");
949 path = RELOC(prom_scratch);
951 for (node = 0; prom_next_node(&node); ) {
953 prom_getprop(node, "device_type", type, sizeof(type));
957 * CHRP Longtrail machines have no device_type
958 * on the memory node, so check the name instead...
960 prom_getprop(node, "name", type, sizeof(type));
962 if (strcmp(type, RELOC("memory")))
965 plen = prom_getprop(node, "reg", RELOC(regbuf), sizeof(regbuf));
966 if (plen > sizeof(regbuf)) {
967 prom_printf("memory node too large for buffer !\n");
968 plen = sizeof(regbuf);
971 endp = p + (plen / sizeof(cell_t));
974 memset(path, 0, PROM_SCRATCH_SIZE);
975 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
976 prom_debug(" node %s :\n", path);
977 #endif /* DEBUG_PROM */
979 while ((endp - p) >= (rac + rsc)) {
980 unsigned long base, size;
982 base = prom_next_cell(rac, &p);
983 size = prom_next_cell(rsc, &p);
987 prom_debug(" %x %x\n", base, size);
989 RELOC(rmo_top) = size;
990 if ((base + size) > RELOC(ram_top))
991 RELOC(ram_top) = base + size;
995 RELOC(alloc_bottom) = PAGE_ALIGN((unsigned long)&RELOC(_end) + 0x4000);
997 /* Check if we have an initrd after the kernel, if we do move our bottom
1000 if (RELOC(prom_initrd_start)) {
1001 if (RELOC(prom_initrd_end) > RELOC(alloc_bottom))
1002 RELOC(alloc_bottom) = PAGE_ALIGN(RELOC(prom_initrd_end));
1006 * If prom_memory_limit is set we reduce the upper limits *except* for
1007 * alloc_top_high. This must be the real top of RAM so we can put
1011 RELOC(alloc_top_high) = RELOC(ram_top);
1013 if (RELOC(prom_memory_limit)) {
1014 if (RELOC(prom_memory_limit) <= RELOC(alloc_bottom)) {
1015 prom_printf("Ignoring mem=%x <= alloc_bottom.\n",
1016 RELOC(prom_memory_limit));
1017 RELOC(prom_memory_limit) = 0;
1018 } else if (RELOC(prom_memory_limit) >= RELOC(ram_top)) {
1019 prom_printf("Ignoring mem=%x >= ram_top.\n",
1020 RELOC(prom_memory_limit));
1021 RELOC(prom_memory_limit) = 0;
1023 RELOC(ram_top) = RELOC(prom_memory_limit);
1024 RELOC(rmo_top) = min(RELOC(rmo_top), RELOC(prom_memory_limit));
1029 * Setup our top alloc point, that is top of RMO or top of
1030 * segment 0 when running non-LPAR.
1031 * Some RS64 machines have buggy firmware where claims up at
1032 * 1GB fail. Cap at 768MB as a workaround.
1033 * Since 768MB is plenty of room, and we need to cap to something
1034 * reasonable on 32-bit, cap at 768MB on all machines.
1036 if (!RELOC(rmo_top))
1037 RELOC(rmo_top) = RELOC(ram_top);
1038 RELOC(rmo_top) = min(0x30000000ul, RELOC(rmo_top));
1039 RELOC(alloc_top) = RELOC(rmo_top);
1041 prom_printf("memory layout at init:\n");
1042 prom_printf(" memory_limit : %x (16 MB aligned)\n", RELOC(prom_memory_limit));
1043 prom_printf(" alloc_bottom : %x\n", RELOC(alloc_bottom));
1044 prom_printf(" alloc_top : %x\n", RELOC(alloc_top));
1045 prom_printf(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
1046 prom_printf(" rmo_top : %x\n", RELOC(rmo_top));
1047 prom_printf(" ram_top : %x\n", RELOC(ram_top));
1049 if (RELOC(prom_crashk_base)) {
1050 prom_printf(" crashk_base : %x\n", RELOC(prom_crashk_base));
1051 prom_printf(" crashk_size : %x\n", RELOC(prom_crashk_size));
1058 * Allocate room for and instantiate RTAS
1060 static void __init prom_instantiate_rtas(void)
1064 u32 base, entry = 0;
1067 prom_debug("prom_instantiate_rtas: start...\n");
1069 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1070 prom_debug("rtas_node: %x\n", rtas_node);
1071 if (!PHANDLE_VALID(rtas_node))
1074 prom_getprop(rtas_node, "rtas-size", &size, sizeof(size));
1078 base = alloc_down(size, PAGE_SIZE, 0);
1080 prom_printf("RTAS allocation failed !\n");
1084 rtas_inst = call_prom("open", 1, 1, ADDR("/rtas"));
1085 if (!IHANDLE_VALID(rtas_inst)) {
1086 prom_printf("opening rtas package failed (%x)\n", rtas_inst);
1090 prom_printf("instantiating rtas at 0x%x ...", base);
1092 if (call_prom_ret("call-method", 3, 2, &entry,
1093 ADDR("instantiate-rtas"),
1094 rtas_inst, base) != 0
1096 prom_printf(" failed\n");
1099 prom_printf(" done\n");
1101 reserve_mem(base, size);
1103 prom_setprop(rtas_node, "/rtas", "linux,rtas-base",
1104 &base, sizeof(base));
1105 prom_setprop(rtas_node, "/rtas", "linux,rtas-entry",
1106 &entry, sizeof(entry));
1108 prom_debug("rtas base = 0x%x\n", base);
1109 prom_debug("rtas entry = 0x%x\n", entry);
1110 prom_debug("rtas size = 0x%x\n", (long)size);
1112 prom_debug("prom_instantiate_rtas: end...\n");
1117 * Allocate room for and initialize TCE tables
1119 static void __init prom_initialize_tce_table(void)
1123 char compatible[64], type[64], model[64];
1124 char *path = RELOC(prom_scratch);
1126 u32 minalign, minsize;
1127 u64 tce_entry, *tce_entryp;
1128 u64 local_alloc_top, local_alloc_bottom;
1131 if (RELOC(ppc64_iommu_off))
1134 prom_debug("starting prom_initialize_tce_table\n");
1136 /* Cache current top of allocs so we reserve a single block */
1137 local_alloc_top = RELOC(alloc_top_high);
1138 local_alloc_bottom = local_alloc_top;
1140 /* Search all nodes looking for PHBs. */
1141 for (node = 0; prom_next_node(&node); ) {
1145 prom_getprop(node, "compatible",
1146 compatible, sizeof(compatible));
1147 prom_getprop(node, "device_type", type, sizeof(type));
1148 prom_getprop(node, "model", model, sizeof(model));
1150 if ((type[0] == 0) || (strstr(type, RELOC("pci")) == NULL))
1153 /* Keep the old logic in tack to avoid regression. */
1154 if (compatible[0] != 0) {
1155 if ((strstr(compatible, RELOC("python")) == NULL) &&
1156 (strstr(compatible, RELOC("Speedwagon")) == NULL) &&
1157 (strstr(compatible, RELOC("Winnipeg")) == NULL))
1159 } else if (model[0] != 0) {
1160 if ((strstr(model, RELOC("ython")) == NULL) &&
1161 (strstr(model, RELOC("peedwagon")) == NULL) &&
1162 (strstr(model, RELOC("innipeg")) == NULL))
1166 if (prom_getprop(node, "tce-table-minalign", &minalign,
1167 sizeof(minalign)) == PROM_ERROR)
1169 if (prom_getprop(node, "tce-table-minsize", &minsize,
1170 sizeof(minsize)) == PROM_ERROR)
1171 minsize = 4UL << 20;
1174 * Even though we read what OF wants, we just set the table
1175 * size to 4 MB. This is enough to map 2GB of PCI DMA space.
1176 * By doing this, we avoid the pitfalls of trying to DMA to
1177 * MMIO space and the DMA alias hole.
1179 * On POWER4, firmware sets the TCE region by assuming
1180 * each TCE table is 8MB. Using this memory for anything
1181 * else will impact performance, so we always allocate 8MB.
1184 if (__is_processor(PV_POWER4) || __is_processor(PV_POWER4p))
1185 minsize = 8UL << 20;
1187 minsize = 4UL << 20;
1189 /* Align to the greater of the align or size */
1190 align = max(minalign, minsize);
1191 base = alloc_down(minsize, align, 1);
1193 prom_panic("ERROR, cannot find space for TCE table.\n");
1194 if (base < local_alloc_bottom)
1195 local_alloc_bottom = base;
1197 /* It seems OF doesn't null-terminate the path :-( */
1198 memset(path, 0, sizeof(path));
1199 /* Call OF to setup the TCE hardware */
1200 if (call_prom("package-to-path", 3, 1, node,
1201 path, PROM_SCRATCH_SIZE-1) == PROM_ERROR) {
1202 prom_printf("package-to-path failed\n");
1205 /* Save away the TCE table attributes for later use. */
1206 prom_setprop(node, path, "linux,tce-base", &base, sizeof(base));
1207 prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize));
1209 prom_debug("TCE table: %s\n", path);
1210 prom_debug("\tnode = 0x%x\n", node);
1211 prom_debug("\tbase = 0x%x\n", base);
1212 prom_debug("\tsize = 0x%x\n", minsize);
1214 /* Initialize the table to have a one-to-one mapping
1215 * over the allocated size.
1217 tce_entryp = (unsigned long *)base;
1218 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) {
1219 tce_entry = (i << PAGE_SHIFT);
1221 *tce_entryp = tce_entry;
1224 prom_printf("opening PHB %s", path);
1225 phb_node = call_prom("open", 1, 1, path);
1227 prom_printf("... failed\n");
1229 prom_printf("... done\n");
1231 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
1232 phb_node, -1, minsize,
1233 (u32) base, (u32) (base >> 32));
1234 call_prom("close", 1, 0, phb_node);
1237 reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);
1239 if (RELOC(prom_memory_limit)) {
1241 * We align the start to a 16MB boundary so we can map
1242 * the TCE area using large pages if possible.
1243 * The end should be the top of RAM so no need to align it.
1245 RELOC(prom_tce_alloc_start) = _ALIGN_DOWN(local_alloc_bottom,
1247 RELOC(prom_tce_alloc_end) = local_alloc_top;
1250 /* Flag the first invalid entry */
1251 prom_debug("ending prom_initialize_tce_table\n");
1256 * With CHRP SMP we need to use the OF to start the other processors.
1257 * We can't wait until smp_boot_cpus (the OF is trashed by then)
1258 * so we have to put the processors into a holding pattern controlled
1259 * by the kernel (not OF) before we destroy the OF.
1261 * This uses a chunk of low memory, puts some holding pattern
1262 * code there and sends the other processors off to there until
1263 * smp_boot_cpus tells them to do something. The holding pattern
1264 * checks that address until its cpu # is there, when it is that
1265 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care
1266 * of setting those values.
1268 * We also use physical address 0x4 here to tell when a cpu
1269 * is in its holding pattern code.
1273 extern void __secondary_hold(void);
1274 extern unsigned long __secondary_hold_spinloop;
1275 extern unsigned long __secondary_hold_acknowledge;
1278 * We want to reference the copy of __secondary_hold_* in the
1279 * 0 - 0x100 address range
1281 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff)
1283 static void __init prom_hold_cpus(void)
1290 unsigned int interrupt_server[MAX_CPU_THREADS];
1291 unsigned int cpu_threads, hw_cpu_num;
1293 struct prom_t *_prom = &RELOC(prom);
1294 unsigned long *spinloop
1295 = (void *) LOW_ADDR(__secondary_hold_spinloop);
1296 unsigned long *acknowledge
1297 = (void *) LOW_ADDR(__secondary_hold_acknowledge);
1299 /* __secondary_hold is actually a descriptor, not the text address */
1300 unsigned long secondary_hold
1301 = __pa(*PTRRELOC((unsigned long *)__secondary_hold));
1303 unsigned long secondary_hold = LOW_ADDR(__secondary_hold);
1306 prom_debug("prom_hold_cpus: start...\n");
1307 prom_debug(" 1) spinloop = 0x%x\n", (unsigned long)spinloop);
1308 prom_debug(" 1) *spinloop = 0x%x\n", *spinloop);
1309 prom_debug(" 1) acknowledge = 0x%x\n",
1310 (unsigned long)acknowledge);
1311 prom_debug(" 1) *acknowledge = 0x%x\n", *acknowledge);
1312 prom_debug(" 1) secondary_hold = 0x%x\n", secondary_hold);
1314 /* Set the common spinloop variable, so all of the secondary cpus
1315 * will block when they are awakened from their OF spinloop.
1316 * This must occur for both SMP and non SMP kernels, since OF will
1317 * be trashed when we move the kernel.
1322 for (i = 0; i < NR_CPUS; i++)
1323 RELOC(hmt_thread_data)[i].pir = 0xdeadbeef;
1326 for (node = 0; prom_next_node(&node); ) {
1328 prom_getprop(node, "device_type", type, sizeof(type));
1329 if (strcmp(type, RELOC("cpu")) != 0)
1332 /* Skip non-configured cpus. */
1333 if (prom_getprop(node, "status", type, sizeof(type)) > 0)
1334 if (strcmp(type, RELOC("okay")) != 0)
1338 prom_getprop(node, "reg", ®, sizeof(reg));
1340 prom_debug("\ncpuid = 0x%x\n", cpuid);
1341 prom_debug("cpu hw idx = 0x%x\n", reg);
1343 /* Init the acknowledge var which will be reset by
1344 * the secondary cpu when it awakens from its OF
1347 *acknowledge = (unsigned long)-1;
1349 propsize = prom_getprop(node, "ibm,ppc-interrupt-server#s",
1351 sizeof(interrupt_server));
1353 /* no property. old hardware has no SMT */
1355 interrupt_server[0] = reg; /* fake it with phys id */
1357 /* We have a threaded processor */
1358 cpu_threads = propsize / sizeof(u32);
1359 if (cpu_threads > MAX_CPU_THREADS) {
1360 prom_printf("SMT: too many threads!\n"
1361 "SMT: found %x, max is %x\n",
1362 cpu_threads, MAX_CPU_THREADS);
1363 cpu_threads = 1; /* ToDo: panic? */
1367 hw_cpu_num = interrupt_server[0];
1368 if (hw_cpu_num != _prom->cpu) {
1369 /* Primary Thread of non-boot cpu */
1370 prom_printf("%x : starting cpu hw idx %x... ", cpuid, reg);
1371 call_prom("start-cpu", 3, 0, node,
1372 secondary_hold, reg);
1374 for (i = 0; (i < 100000000) &&
1375 (*acknowledge == ((unsigned long)-1)); i++ )
1378 if (*acknowledge == reg)
1379 prom_printf("done\n");
1381 prom_printf("failed: %x\n", *acknowledge);
1385 prom_printf("%x : boot cpu %x\n", cpuid, reg);
1386 #endif /* CONFIG_SMP */
1388 /* Reserve cpu #s for secondary threads. They start later. */
1389 cpuid += cpu_threads;
1392 /* Only enable HMT on processors that provide support. */
1393 if (__is_processor(PV_PULSAR) ||
1394 __is_processor(PV_ICESTAR) ||
1395 __is_processor(PV_SSTAR)) {
1396 prom_printf(" starting secondary threads\n");
1398 for (i = 0; i < NR_CPUS; i += 2) {
1403 unsigned long pir = mfspr(SPRN_PIR);
1404 if (__is_processor(PV_PULSAR)) {
1405 RELOC(hmt_thread_data)[i].pir =
1408 RELOC(hmt_thread_data)[i].pir =
1414 prom_printf("Processor is not HMT capable\n");
1418 if (cpuid > NR_CPUS)
1419 prom_printf("WARNING: maximum CPUs (" __stringify(NR_CPUS)
1420 ") exceeded: ignoring extras\n");
1422 prom_debug("prom_hold_cpus: end...\n");
1426 static void __init prom_init_client_services(unsigned long pp)
1428 struct prom_t *_prom = &RELOC(prom);
1430 /* Get a handle to the prom entry point before anything else */
1431 RELOC(prom_entry) = pp;
1433 /* get a handle for the stdout device */
1434 _prom->chosen = call_prom("finddevice", 1, 1, ADDR("/chosen"));
1435 if (!PHANDLE_VALID(_prom->chosen))
1436 prom_panic("cannot find chosen"); /* msg won't be printed :( */
1438 /* get device tree root */
1439 _prom->root = call_prom("finddevice", 1, 1, ADDR("/"));
1440 if (!PHANDLE_VALID(_prom->root))
1441 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
1448 * For really old powermacs, we need to map things we claim.
1449 * For that, we need the ihandle of the mmu.
1450 * Also, on the longtrail, we need to work around other bugs.
1452 static void __init prom_find_mmu(void)
1454 struct prom_t *_prom = &RELOC(prom);
1458 oprom = call_prom("finddevice", 1, 1, ADDR("/openprom"));
1459 if (!PHANDLE_VALID(oprom))
1461 if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0)
1463 version[sizeof(version) - 1] = 0;
1464 /* XXX might need to add other versions here */
1465 if (strcmp(version, "Open Firmware, 1.0.5") == 0)
1466 of_workarounds = OF_WA_CLAIM;
1467 else if (strncmp(version, "FirmWorks,3.", 12) == 0) {
1468 of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL;
1469 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
1472 _prom->memory = call_prom("open", 1, 1, ADDR("/memory"));
1473 prom_getprop(_prom->chosen, "mmu", &_prom->mmumap,
1474 sizeof(_prom->mmumap));
1475 if (!IHANDLE_VALID(_prom->memory) || !IHANDLE_VALID(_prom->mmumap))
1476 of_workarounds &= ~OF_WA_CLAIM; /* hmmm */
1479 #define prom_find_mmu()
1482 static void __init prom_init_stdout(void)
1484 struct prom_t *_prom = &RELOC(prom);
1485 char *path = RELOC(of_stdout_device);
1489 if (prom_getprop(_prom->chosen, "stdout", &val, sizeof(val)) <= 0)
1490 prom_panic("cannot find stdout");
1492 _prom->stdout = val;
1494 /* Get the full OF pathname of the stdout device */
1495 memset(path, 0, 256);
1496 call_prom("instance-to-path", 3, 1, _prom->stdout, path, 255);
1497 val = call_prom("instance-to-package", 1, 1, _prom->stdout);
1498 prom_setprop(_prom->chosen, "/chosen", "linux,stdout-package",
1500 prom_printf("OF stdout device is: %s\n", RELOC(of_stdout_device));
1501 prom_setprop(_prom->chosen, "/chosen", "linux,stdout-path",
1502 path, strlen(path) + 1);
1504 /* If it's a display, note it */
1505 memset(type, 0, sizeof(type));
1506 prom_getprop(val, "device_type", type, sizeof(type));
1507 if (strcmp(type, RELOC("display")) == 0)
1508 prom_setprop(val, path, "linux,boot-display", NULL, 0);
1511 static void __init prom_close_stdin(void)
1513 struct prom_t *_prom = &RELOC(prom);
1516 if (prom_getprop(_prom->chosen, "stdin", &val, sizeof(val)) > 0)
1517 call_prom("close", 1, 0, val);
1520 static int __init prom_find_machine_type(void)
1522 struct prom_t *_prom = &RELOC(prom);
1528 len = prom_getprop(_prom->root, "compatible",
1529 compat, sizeof(compat)-1);
1533 char *p = &compat[i];
1537 if (strstr(p, RELOC("Power Macintosh")) ||
1538 strstr(p, RELOC("MacRISC")))
1539 return PLATFORM_POWERMAC;
1541 if (strstr(p, RELOC("Momentum,Maple")))
1542 return PLATFORM_MAPLE;
1543 if (strstr(p, RELOC("IBM,CPB")))
1544 return PLATFORM_CELL;
1550 /* Default to pSeries. We need to know if we are running LPAR */
1551 rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1552 if (PHANDLE_VALID(rtas)) {
1553 int x = prom_getproplen(rtas, "ibm,hypertas-functions");
1554 if (x != PROM_ERROR) {
1555 prom_printf("Hypertas detected, assuming LPAR !\n");
1556 return PLATFORM_PSERIES_LPAR;
1559 return PLATFORM_PSERIES;
1561 return PLATFORM_CHRP;
1565 static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
1567 return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);
1571 * If we have a display that we don't know how to drive,
1572 * we will want to try to execute OF's open method for it
1573 * later. However, OF will probably fall over if we do that
1574 * we've taken over the MMU.
1575 * So we check whether we will need to open the display,
1576 * and if so, open it now.
1578 static void __init prom_check_displays(void)
1580 char type[16], *path;
1585 static unsigned char default_colors[] = {
1603 const unsigned char *clut;
1605 prom_printf("Looking for displays\n");
1606 for (node = 0; prom_next_node(&node); ) {
1607 memset(type, 0, sizeof(type));
1608 prom_getprop(node, "device_type", type, sizeof(type));
1609 if (strcmp(type, RELOC("display")) != 0)
1612 /* It seems OF doesn't null-terminate the path :-( */
1613 path = RELOC(prom_scratch);
1614 memset(path, 0, PROM_SCRATCH_SIZE);
1617 * leave some room at the end of the path for appending extra
1620 if (call_prom("package-to-path", 3, 1, node, path,
1621 PROM_SCRATCH_SIZE-10) == PROM_ERROR)
1623 prom_printf("found display : %s, opening ... ", path);
1625 ih = call_prom("open", 1, 1, path);
1627 prom_printf("failed\n");
1632 prom_printf("done\n");
1633 prom_setprop(node, path, "linux,opened", NULL, 0);
1635 /* Setup a usable color table when the appropriate
1636 * method is available. Should update this to set-colors */
1637 clut = RELOC(default_colors);
1638 for (i = 0; i < 32; i++, clut += 3)
1639 if (prom_set_color(ih, i, clut[0], clut[1],
1643 #ifdef CONFIG_LOGO_LINUX_CLUT224
1644 clut = PTRRELOC(RELOC(logo_linux_clut224.clut));
1645 for (i = 0; i < RELOC(logo_linux_clut224.clutsize); i++, clut += 3)
1646 if (prom_set_color(ih, i + 32, clut[0], clut[1],
1649 #endif /* CONFIG_LOGO_LINUX_CLUT224 */
1654 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */
1655 static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end,
1656 unsigned long needed, unsigned long align)
1660 *mem_start = _ALIGN(*mem_start, align);
1661 while ((*mem_start + needed) > *mem_end) {
1662 unsigned long room, chunk;
1664 prom_debug("Chunk exhausted, claiming more at %x...\n",
1665 RELOC(alloc_bottom));
1666 room = RELOC(alloc_top) - RELOC(alloc_bottom);
1667 if (room > DEVTREE_CHUNK_SIZE)
1668 room = DEVTREE_CHUNK_SIZE;
1669 if (room < PAGE_SIZE)
1670 prom_panic("No memory for flatten_device_tree (no room)");
1671 chunk = alloc_up(room, 0);
1673 prom_panic("No memory for flatten_device_tree (claim failed)");
1674 *mem_end = RELOC(alloc_top);
1677 ret = (void *)*mem_start;
1678 *mem_start += needed;
1683 #define dt_push_token(token, mem_start, mem_end) \
1684 do { *((u32 *)make_room(mem_start, mem_end, 4, 4)) = token; } while(0)
1686 static unsigned long __init dt_find_string(char *str)
1690 s = os = (char *)RELOC(dt_string_start);
1692 while (s < (char *)RELOC(dt_string_end)) {
1693 if (strcmp(s, str) == 0)
1701 * The Open Firmware 1275 specification states properties must be 31 bytes or
1702 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
1704 #define MAX_PROPERTY_NAME 64
1706 static void __init scan_dt_build_strings(phandle node,
1707 unsigned long *mem_start,
1708 unsigned long *mem_end)
1710 char *prev_name, *namep, *sstart;
1714 sstart = (char *)RELOC(dt_string_start);
1716 /* get and store all property names */
1717 prev_name = RELOC("");
1719 /* 64 is max len of name including nul. */
1720 namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1);
1721 if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) {
1722 /* No more nodes: unwind alloc */
1723 *mem_start = (unsigned long)namep;
1728 if (strcmp(namep, RELOC("name")) == 0) {
1729 *mem_start = (unsigned long)namep;
1730 prev_name = RELOC("name");
1733 /* get/create string entry */
1734 soff = dt_find_string(namep);
1736 *mem_start = (unsigned long)namep;
1737 namep = sstart + soff;
1739 /* Trim off some if we can */
1740 *mem_start = (unsigned long)namep + strlen(namep) + 1;
1741 RELOC(dt_string_end) = *mem_start;
1746 /* do all our children */
1747 child = call_prom("child", 1, 1, node);
1748 while (child != 0) {
1749 scan_dt_build_strings(child, mem_start, mem_end);
1750 child = call_prom("peer", 1, 1, child);
1754 static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
1755 unsigned long *mem_end)
1758 char *namep, *prev_name, *sstart, *p, *ep, *lp, *path;
1760 unsigned char *valp;
1761 static char pname[MAX_PROPERTY_NAME];
1764 dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);
1766 /* get the node's full name */
1767 namep = (char *)*mem_start;
1768 room = *mem_end - *mem_start;
1771 l = call_prom("package-to-path", 3, 1, node, namep, room);
1773 /* Didn't fit? Get more room. */
1775 if (l >= *mem_end - *mem_start)
1776 namep = make_room(mem_start, mem_end, l+1, 1);
1777 call_prom("package-to-path", 3, 1, node, namep, l);
1781 /* Fixup an Apple bug where they have bogus \0 chars in the
1782 * middle of the path in some properties, and extract
1783 * the unit name (everything after the last '/').
1785 for (lp = p = namep, ep = namep + l; p < ep; p++) {
1792 *mem_start = _ALIGN((unsigned long)lp + 1, 4);
1795 /* get it again for debugging */
1796 path = RELOC(prom_scratch);
1797 memset(path, 0, PROM_SCRATCH_SIZE);
1798 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
1800 /* get and store all properties */
1801 prev_name = RELOC("");
1802 sstart = (char *)RELOC(dt_string_start);
1804 if (call_prom("nextprop", 3, 1, node, prev_name,
1809 if (strcmp(RELOC(pname), RELOC("name")) == 0) {
1810 prev_name = RELOC("name");
1814 /* find string offset */
1815 soff = dt_find_string(RELOC(pname));
1817 prom_printf("WARNING: Can't find string index for"
1818 " <%s>, node %s\n", RELOC(pname), path);
1821 prev_name = sstart + soff;
1824 l = call_prom("getproplen", 2, 1, node, RELOC(pname));
1827 if (l == PROM_ERROR)
1829 if (l > MAX_PROPERTY_LENGTH) {
1830 prom_printf("WARNING: ignoring large property ");
1831 /* It seems OF doesn't null-terminate the path :-( */
1832 prom_printf("[%s] ", path);
1833 prom_printf("%s length 0x%x\n", RELOC(pname), l);
1837 /* push property head */
1838 dt_push_token(OF_DT_PROP, mem_start, mem_end);
1839 dt_push_token(l, mem_start, mem_end);
1840 dt_push_token(soff, mem_start, mem_end);
1842 /* push property content */
1843 valp = make_room(mem_start, mem_end, l, 4);
1844 call_prom("getprop", 4, 1, node, RELOC(pname), valp, l);
1845 *mem_start = _ALIGN(*mem_start, 4);
1848 /* Add a "linux,phandle" property. */
1849 soff = dt_find_string(RELOC("linux,phandle"));
1851 prom_printf("WARNING: Can't find string index for"
1852 " <linux-phandle> node %s\n", path);
1854 dt_push_token(OF_DT_PROP, mem_start, mem_end);
1855 dt_push_token(4, mem_start, mem_end);
1856 dt_push_token(soff, mem_start, mem_end);
1857 valp = make_room(mem_start, mem_end, 4, 4);
1858 *(u32 *)valp = node;
1861 /* do all our children */
1862 child = call_prom("child", 1, 1, node);
1863 while (child != 0) {
1864 scan_dt_build_struct(child, mem_start, mem_end);
1865 child = call_prom("peer", 1, 1, child);
1868 dt_push_token(OF_DT_END_NODE, mem_start, mem_end);
1871 static void __init flatten_device_tree(void)
1874 unsigned long mem_start, mem_end, room;
1875 struct boot_param_header *hdr;
1876 struct prom_t *_prom = &RELOC(prom);
1881 * Check how much room we have between alloc top & bottom (+/- a
1882 * few pages), crop to 4Mb, as this is our "chuck" size
1884 room = RELOC(alloc_top) - RELOC(alloc_bottom) - 0x4000;
1885 if (room > DEVTREE_CHUNK_SIZE)
1886 room = DEVTREE_CHUNK_SIZE;
1887 prom_debug("starting device tree allocs at %x\n", RELOC(alloc_bottom));
1889 /* Now try to claim that */
1890 mem_start = (unsigned long)alloc_up(room, PAGE_SIZE);
1892 prom_panic("Can't allocate initial device-tree chunk\n");
1893 mem_end = RELOC(alloc_top);
1895 /* Get root of tree */
1896 root = call_prom("peer", 1, 1, (phandle)0);
1897 if (root == (phandle)0)
1898 prom_panic ("couldn't get device tree root\n");
1900 /* Build header and make room for mem rsv map */
1901 mem_start = _ALIGN(mem_start, 4);
1902 hdr = make_room(&mem_start, &mem_end,
1903 sizeof(struct boot_param_header), 4);
1904 RELOC(dt_header_start) = (unsigned long)hdr;
1905 rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8);
1907 /* Start of strings */
1908 mem_start = PAGE_ALIGN(mem_start);
1909 RELOC(dt_string_start) = mem_start;
1910 mem_start += 4; /* hole */
1912 /* Add "linux,phandle" in there, we'll need it */
1913 namep = make_room(&mem_start, &mem_end, 16, 1);
1914 strcpy(namep, RELOC("linux,phandle"));
1915 mem_start = (unsigned long)namep + strlen(namep) + 1;
1917 /* Build string array */
1918 prom_printf("Building dt strings...\n");
1919 scan_dt_build_strings(root, &mem_start, &mem_end);
1920 RELOC(dt_string_end) = mem_start;
1922 /* Build structure */
1923 mem_start = PAGE_ALIGN(mem_start);
1924 RELOC(dt_struct_start) = mem_start;
1925 prom_printf("Building dt structure...\n");
1926 scan_dt_build_struct(root, &mem_start, &mem_end);
1927 dt_push_token(OF_DT_END, &mem_start, &mem_end);
1928 RELOC(dt_struct_end) = PAGE_ALIGN(mem_start);
1931 hdr->boot_cpuid_phys = _prom->cpu;
1932 hdr->magic = OF_DT_HEADER;
1933 hdr->totalsize = RELOC(dt_struct_end) - RELOC(dt_header_start);
1934 hdr->off_dt_struct = RELOC(dt_struct_start) - RELOC(dt_header_start);
1935 hdr->off_dt_strings = RELOC(dt_string_start) - RELOC(dt_header_start);
1936 hdr->dt_strings_size = RELOC(dt_string_end) - RELOC(dt_string_start);
1937 hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - RELOC(dt_header_start);
1938 hdr->version = OF_DT_VERSION;
1939 /* Version 16 is not backward compatible */
1940 hdr->last_comp_version = 0x10;
1942 /* Reserve the whole thing and copy the reserve map in, we
1943 * also bump mem_reserve_cnt to cause further reservations to
1944 * fail since it's too late.
1946 reserve_mem(RELOC(dt_header_start), hdr->totalsize);
1947 memcpy(rsvmap, RELOC(mem_reserve_map), sizeof(mem_reserve_map));
1952 prom_printf("reserved memory map:\n");
1953 for (i = 0; i < RELOC(mem_reserve_cnt); i++)
1954 prom_printf(" %x - %x\n",
1955 RELOC(mem_reserve_map)[i].base,
1956 RELOC(mem_reserve_map)[i].size);
1959 RELOC(mem_reserve_cnt) = MEM_RESERVE_MAP_SIZE;
1961 prom_printf("Device tree strings 0x%x -> 0x%x\n",
1962 RELOC(dt_string_start), RELOC(dt_string_end));
1963 prom_printf("Device tree struct 0x%x -> 0x%x\n",
1964 RELOC(dt_struct_start), RELOC(dt_struct_end));
1969 static void __init fixup_device_tree(void)
1971 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
1972 phandle u3, i2c, mpic;
1977 /* Some G5s have a missing interrupt definition, fix it up here */
1978 u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
1979 if (!PHANDLE_VALID(u3))
1981 i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
1982 if (!PHANDLE_VALID(i2c))
1984 mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
1985 if (!PHANDLE_VALID(mpic))
1988 /* check if proper rev of u3 */
1989 if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev))
1992 if (u3_rev < 0x35 || u3_rev > 0x39)
1994 /* does it need fixup ? */
1995 if (prom_getproplen(i2c, "interrupts") > 0)
1998 prom_printf("fixing up bogus interrupts for u3 i2c...\n");
2000 /* interrupt on this revision of u3 is number 0 and level */
2003 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts",
2004 &interrupts, sizeof(interrupts));
2006 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
2007 &parent, sizeof(parent));
2012 static void __init prom_find_boot_cpu(void)
2014 struct prom_t *_prom = &RELOC(prom);
2020 if (prom_getprop(_prom->chosen, "cpu", &prom_cpu, sizeof(prom_cpu)) <= 0)
2023 cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);
2025 prom_getprop(cpu_pkg, "reg", &getprop_rval, sizeof(getprop_rval));
2026 _prom->cpu = getprop_rval;
2028 prom_debug("Booting CPU hw index = 0x%x\n", _prom->cpu);
2031 static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
2033 #ifdef CONFIG_BLK_DEV_INITRD
2034 struct prom_t *_prom = &RELOC(prom);
2036 if (r3 && r4 && r4 != 0xdeadbeef) {
2039 RELOC(prom_initrd_start) = is_kernel_addr(r3) ? __pa(r3) : r3;
2040 RELOC(prom_initrd_end) = RELOC(prom_initrd_start) + r4;
2042 val = RELOC(prom_initrd_start);
2043 prom_setprop(_prom->chosen, "/chosen", "linux,initrd-start",
2045 val = RELOC(prom_initrd_end);
2046 prom_setprop(_prom->chosen, "/chosen", "linux,initrd-end",
2049 reserve_mem(RELOC(prom_initrd_start),
2050 RELOC(prom_initrd_end) - RELOC(prom_initrd_start));
2052 prom_debug("initrd_start=0x%x\n", RELOC(prom_initrd_start));
2053 prom_debug("initrd_end=0x%x\n", RELOC(prom_initrd_end));
2055 #endif /* CONFIG_BLK_DEV_INITRD */
2059 * We enter here early on, when the Open Firmware prom is still
2060 * handling exceptions and the MMU hash table for us.
2063 unsigned long __init prom_init(unsigned long r3, unsigned long r4,
2065 unsigned long r6, unsigned long r7)
2067 struct prom_t *_prom;
2070 unsigned long offset = reloc_offset();
2076 _prom = &RELOC(prom);
2079 * First zero the BSS
2081 memset(&RELOC(__bss_start), 0, __bss_stop - __bss_start);
2084 * Init interface to Open Firmware, get some node references,
2087 prom_init_client_services(pp);
2090 * See if this OF is old enough that we need to do explicit maps
2091 * and other workarounds
2096 * Init prom stdout device
2101 * Check for an initrd
2103 prom_check_initrd(r3, r4);
2106 * Get default machine type. At this point, we do not differentiate
2107 * between pSeries SMP and pSeries LPAR
2109 RELOC(of_platform) = prom_find_machine_type();
2110 getprop_rval = RELOC(of_platform);
2111 prom_setprop(_prom->chosen, "/chosen", "linux,platform",
2112 &getprop_rval, sizeof(getprop_rval));
2114 #ifdef CONFIG_PPC_PSERIES
2116 * On pSeries, inform the firmware about our capabilities
2118 if (RELOC(of_platform) == PLATFORM_PSERIES ||
2119 RELOC(of_platform) == PLATFORM_PSERIES_LPAR)
2120 prom_send_capabilities();
2124 * Copy the CPU hold code
2126 if (RELOC(of_platform) != PLATFORM_POWERMAC)
2127 copy_and_flush(0, KERNELBASE + offset, 0x100, 0);
2130 * Do early parsing of command line
2132 early_cmdline_parse();
2135 * Initialize memory management within prom_init
2140 if (RELOC(prom_crashk_base))
2141 reserve_mem(RELOC(prom_crashk_base), RELOC(prom_crashk_size));
2144 * Determine which cpu is actually running right _now_
2146 prom_find_boot_cpu();
2149 * Initialize display devices
2151 prom_check_displays();
2155 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
2156 * that uses the allocator, we need to make sure we get the top of memory
2157 * available for us here...
2159 if (RELOC(of_platform) == PLATFORM_PSERIES)
2160 prom_initialize_tce_table();
2164 * On non-powermacs, try to instantiate RTAS and puts all CPUs
2165 * in spin-loops. PowerMacs don't have a working RTAS and use
2166 * a different way to spin CPUs
2168 if (RELOC(of_platform) != PLATFORM_POWERMAC) {
2169 prom_instantiate_rtas();
2174 * Fill in some infos for use by the kernel later on
2176 if (RELOC(prom_memory_limit))
2177 prom_setprop(_prom->chosen, "/chosen", "linux,memory-limit",
2178 &RELOC(prom_memory_limit),
2179 sizeof(prom_memory_limit));
2181 if (RELOC(ppc64_iommu_off))
2182 prom_setprop(_prom->chosen, "/chosen", "linux,iommu-off",
2185 if (RELOC(iommu_force_on))
2186 prom_setprop(_prom->chosen, "/chosen", "linux,iommu-force-on",
2189 if (RELOC(prom_tce_alloc_start)) {
2190 prom_setprop(_prom->chosen, "/chosen", "linux,tce-alloc-start",
2191 &RELOC(prom_tce_alloc_start),
2192 sizeof(prom_tce_alloc_start));
2193 prom_setprop(_prom->chosen, "/chosen", "linux,tce-alloc-end",
2194 &RELOC(prom_tce_alloc_end),
2195 sizeof(prom_tce_alloc_end));
2200 if (RELOC(prom_crashk_base)) {
2201 prom_setprop(_prom->chosen, "/chosen", "linux,crashkernel-base",
2202 PTRRELOC(&prom_crashk_base),
2203 sizeof(RELOC(prom_crashk_base)));
2204 prom_setprop(_prom->chosen, "/chosen", "linux,crashkernel-size",
2205 PTRRELOC(&prom_crashk_size),
2206 sizeof(RELOC(prom_crashk_size)));
2210 * Fixup any known bugs in the device-tree
2212 fixup_device_tree();
2215 * Now finally create the flattened device-tree
2217 prom_printf("copying OF device tree ...\n");
2218 flatten_device_tree();
2221 * in case stdin is USB and still active on IBM machines...
2222 * Unfortunately quiesce crashes on some powermacs if we have
2223 * closed stdin already (in particular the powerbook 101).
2225 if (RELOC(of_platform) != PLATFORM_POWERMAC)
2229 * Call OF "quiesce" method to shut down pending DMA's from
2232 prom_printf("Calling quiesce ...\n");
2233 call_prom("quiesce", 0, 0);
2236 * And finally, call the kernel passing it the flattened device
2237 * tree and NULL as r5, thus triggering the new entry point which
2238 * is common to us and kexec
2240 hdr = RELOC(dt_header_start);
2241 prom_printf("returning from prom_init\n");
2242 prom_debug("->dt_header_start=0x%x\n", hdr);
2245 reloc_got2(-offset);
2248 __start(hdr, KERNELBASE + offset, 0);