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.
18 /* we cannot use FORTIFY as it brings in new symbols */
22 #include <linux/kernel.h>
23 #include <linux/string.h>
24 #include <linux/init.h>
25 #include <linux/threads.h>
26 #include <linux/spinlock.h>
27 #include <linux/types.h>
28 #include <linux/pci.h>
29 #include <linux/proc_fs.h>
30 #include <linux/stringify.h>
31 #include <linux/delay.h>
32 #include <linux/initrd.h>
33 #include <linux/bitops.h>
37 #include <asm/processor.h>
42 #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 #include <asm/asm-prototypes.h>
50 #include <linux/linux_logo.h>
53 * Eventually bump that one up
55 #define DEVTREE_CHUNK_SIZE 0x100000
58 * This is the size of the local memory reserve map that gets copied
59 * into the boot params passed to the kernel. That size is totally
60 * flexible as the kernel just reads the list until it encounters an
61 * entry with size 0, so it can be changed without breaking binary
64 #define MEM_RESERVE_MAP_SIZE 8
67 * prom_init() is called very early on, before the kernel text
68 * and data have been mapped to KERNELBASE. At this point the code
69 * is running at whatever address it has been loaded at.
70 * On ppc32 we compile with -mrelocatable, which means that references
71 * to extern and static variables get relocated automatically.
72 * ppc64 objects are always relocatable, we just need to relocate the
75 * Because OF may have mapped I/O devices into the area starting at
76 * KERNELBASE, particularly on CHRP machines, we can't safely call
77 * OF once the kernel has been mapped to KERNELBASE. Therefore all
78 * OF calls must be done within prom_init().
80 * ADDR is used in calls to call_prom. The 4th and following
81 * arguments to call_prom should be 32-bit values.
82 * On ppc64, 64 bit values are truncated to 32 bits (and
83 * fortunately don't get interpreted as two arguments).
85 #define ADDR(x) (u32)(unsigned long)(x)
88 #define OF_WORKAROUNDS 0
90 #define OF_WORKAROUNDS of_workarounds
94 #define OF_WA_CLAIM 1 /* do phys/virt claim separately, then map */
95 #define OF_WA_LONGTRAIL 2 /* work around longtrail bugs */
97 #define PROM_BUG() do { \
98 prom_printf("kernel BUG at %s line 0x%x!\n", \
99 __FILE__, __LINE__); \
100 __asm__ __volatile__(".long " BUG_ILLEGAL_INSTR); \
104 #define prom_debug(x...) prom_printf(x)
106 #define prom_debug(x...)
110 typedef u32 prom_arg_t;
128 struct mem_map_entry {
133 typedef __be32 cell_t;
135 extern void __start(unsigned long r3, unsigned long r4, unsigned long r5,
136 unsigned long r6, unsigned long r7, unsigned long r8,
140 extern int enter_prom(struct prom_args *args, unsigned long entry);
142 static inline int enter_prom(struct prom_args *args, unsigned long entry)
144 return ((int (*)(struct prom_args *))entry)(args);
148 extern void copy_and_flush(unsigned long dest, unsigned long src,
149 unsigned long size, unsigned long offset);
152 static struct prom_t __initdata prom;
154 static unsigned long prom_entry __initdata;
156 #define PROM_SCRATCH_SIZE 256
158 static char __initdata of_stdout_device[256];
159 static char __initdata prom_scratch[PROM_SCRATCH_SIZE];
161 static unsigned long __initdata dt_header_start;
162 static unsigned long __initdata dt_struct_start, dt_struct_end;
163 static unsigned long __initdata dt_string_start, dt_string_end;
165 static unsigned long __initdata prom_initrd_start, prom_initrd_end;
168 static int __initdata prom_iommu_force_on;
169 static int __initdata prom_iommu_off;
170 static unsigned long __initdata prom_tce_alloc_start;
171 static unsigned long __initdata prom_tce_alloc_end;
174 static bool prom_radix_disable __initdata = !IS_ENABLED(CONFIG_PPC_RADIX_MMU_DEFAULT);
176 struct platform_support {
183 /* Platforms codes are now obsolete in the kernel. Now only used within this
184 * file and ultimately gone too. Feel free to change them if you need, they
185 * are not shared with anything outside of this file anymore
187 #define PLATFORM_PSERIES 0x0100
188 #define PLATFORM_PSERIES_LPAR 0x0101
189 #define PLATFORM_LPAR 0x0001
190 #define PLATFORM_POWERMAC 0x0400
191 #define PLATFORM_GENERIC 0x0500
192 #define PLATFORM_OPAL 0x0600
194 static int __initdata of_platform;
196 static char __initdata prom_cmd_line[COMMAND_LINE_SIZE];
198 static unsigned long __initdata prom_memory_limit;
200 static unsigned long __initdata alloc_top;
201 static unsigned long __initdata alloc_top_high;
202 static unsigned long __initdata alloc_bottom;
203 static unsigned long __initdata rmo_top;
204 static unsigned long __initdata ram_top;
206 static struct mem_map_entry __initdata mem_reserve_map[MEM_RESERVE_MAP_SIZE];
207 static int __initdata mem_reserve_cnt;
209 static cell_t __initdata regbuf[1024];
211 static bool rtas_has_query_cpu_stopped;
215 * Error results ... some OF calls will return "-1" on error, some
216 * will return 0, some will return either. To simplify, here are
217 * macros to use with any ihandle or phandle return value to check if
221 #define PROM_ERROR (-1u)
222 #define PHANDLE_VALID(p) ((p) != 0 && (p) != PROM_ERROR)
223 #define IHANDLE_VALID(i) ((i) != 0 && (i) != PROM_ERROR)
226 /* This is the one and *ONLY* place where we actually call open
230 static int __init call_prom(const char *service, int nargs, int nret, ...)
233 struct prom_args args;
236 args.service = cpu_to_be32(ADDR(service));
237 args.nargs = cpu_to_be32(nargs);
238 args.nret = cpu_to_be32(nret);
240 va_start(list, nret);
241 for (i = 0; i < nargs; i++)
242 args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));
245 for (i = 0; i < nret; i++)
246 args.args[nargs+i] = 0;
248 if (enter_prom(&args, prom_entry) < 0)
251 return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;
254 static int __init call_prom_ret(const char *service, int nargs, int nret,
255 prom_arg_t *rets, ...)
258 struct prom_args args;
261 args.service = cpu_to_be32(ADDR(service));
262 args.nargs = cpu_to_be32(nargs);
263 args.nret = cpu_to_be32(nret);
265 va_start(list, rets);
266 for (i = 0; i < nargs; i++)
267 args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));
270 for (i = 0; i < nret; i++)
271 args.args[nargs+i] = 0;
273 if (enter_prom(&args, prom_entry) < 0)
277 for (i = 1; i < nret; ++i)
278 rets[i-1] = be32_to_cpu(args.args[nargs+i]);
280 return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;
284 static void __init prom_print(const char *msg)
288 if (prom.stdout == 0)
291 for (p = msg; *p != 0; p = q) {
292 for (q = p; *q != 0 && *q != '\n'; ++q)
295 call_prom("write", 3, 1, prom.stdout, p, q - p);
299 call_prom("write", 3, 1, prom.stdout, ADDR("\r\n"), 2);
304 static void __init prom_print_hex(unsigned long val)
306 int i, nibbles = sizeof(val)*2;
307 char buf[sizeof(val)*2+1];
309 for (i = nibbles-1; i >= 0; i--) {
310 buf[i] = (val & 0xf) + '0';
312 buf[i] += ('a'-'0'-10);
316 call_prom("write", 3, 1, prom.stdout, buf, nibbles);
319 /* max number of decimal digits in an unsigned long */
321 static void __init prom_print_dec(unsigned long val)
324 char buf[UL_DIGITS+1];
326 for (i = UL_DIGITS-1; i >= 0; i--) {
327 buf[i] = (val % 10) + '0';
332 /* shift stuff down */
333 size = UL_DIGITS - i;
334 call_prom("write", 3, 1, prom.stdout, buf+i, size);
337 static void __init prom_printf(const char *format, ...)
339 const char *p, *q, *s;
344 va_start(args, format);
345 for (p = format; *p != 0; p = q) {
346 for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
349 call_prom("write", 3, 1, prom.stdout, p, q - p);
354 call_prom("write", 3, 1, prom.stdout,
364 s = va_arg(args, const char *);
369 v = va_arg(args, unsigned long);
374 vs = va_arg(args, int);
385 else if (*q == 'x') {
387 v = va_arg(args, unsigned long);
389 } else if (*q == 'u') { /* '%lu' */
391 v = va_arg(args, unsigned long);
393 } else if (*q == 'd') { /* %ld */
395 vs = va_arg(args, long);
409 static unsigned int __init prom_claim(unsigned long virt, unsigned long size,
413 if (align == 0 && (OF_WORKAROUNDS & OF_WA_CLAIM)) {
415 * Old OF requires we claim physical and virtual separately
416 * and then map explicitly (assuming virtual mode)
421 ret = call_prom_ret("call-method", 5, 2, &result,
422 ADDR("claim"), prom.memory,
424 if (ret != 0 || result == -1)
426 ret = call_prom_ret("call-method", 5, 2, &result,
427 ADDR("claim"), prom.mmumap,
430 call_prom("call-method", 4, 1, ADDR("release"),
431 prom.memory, size, virt);
434 /* the 0x12 is M (coherence) + PP == read/write */
435 call_prom("call-method", 6, 1,
436 ADDR("map"), prom.mmumap, 0x12, size, virt, virt);
439 return call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size,
443 static void __init __attribute__((noreturn)) prom_panic(const char *reason)
446 /* Do not call exit because it clears the screen on pmac
447 * it also causes some sort of double-fault on early pmacs */
448 if (of_platform == PLATFORM_POWERMAC)
451 /* ToDo: should put up an SRC here on pSeries */
452 call_prom("exit", 0, 0);
454 for (;;) /* should never get here */
459 static int __init prom_next_node(phandle *nodep)
463 if ((node = *nodep) != 0
464 && (*nodep = call_prom("child", 1, 1, node)) != 0)
466 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
469 if ((node = call_prom("parent", 1, 1, node)) == 0)
471 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
476 static inline int prom_getprop(phandle node, const char *pname,
477 void *value, size_t valuelen)
479 return call_prom("getprop", 4, 1, node, ADDR(pname),
480 (u32)(unsigned long) value, (u32) valuelen);
483 static inline int prom_getproplen(phandle node, const char *pname)
485 return call_prom("getproplen", 2, 1, node, ADDR(pname));
488 static void add_string(char **str, const char *q)
498 static char *tohex(unsigned int x)
500 static char digits[] = "0123456789abcdef";
501 static char result[9];
508 result[i] = digits[x & 0xf];
510 } while (x != 0 && i > 0);
514 static int __init prom_setprop(phandle node, const char *nodename,
515 const char *pname, void *value, size_t valuelen)
519 if (!(OF_WORKAROUNDS & OF_WA_LONGTRAIL))
520 return call_prom("setprop", 4, 1, node, ADDR(pname),
521 (u32)(unsigned long) value, (u32) valuelen);
523 /* gah... setprop doesn't work on longtrail, have to use interpret */
525 add_string(&p, "dev");
526 add_string(&p, nodename);
527 add_string(&p, tohex((u32)(unsigned long) value));
528 add_string(&p, tohex(valuelen));
529 add_string(&p, tohex(ADDR(pname)));
530 add_string(&p, tohex(strlen(pname)));
531 add_string(&p, "property");
533 return call_prom("interpret", 1, 1, (u32)(unsigned long) cmd);
536 /* We can't use the standard versions because of relocation headaches. */
537 #define isxdigit(c) (('0' <= (c) && (c) <= '9') \
538 || ('a' <= (c) && (c) <= 'f') \
539 || ('A' <= (c) && (c) <= 'F'))
541 #define isdigit(c) ('0' <= (c) && (c) <= '9')
542 #define islower(c) ('a' <= (c) && (c) <= 'z')
543 #define toupper(c) (islower(c) ? ((c) - 'a' + 'A') : (c))
545 static unsigned long prom_strtoul(const char *cp, const char **endp)
547 unsigned long result = 0, base = 10, value;
552 if (toupper(*cp) == 'X') {
558 while (isxdigit(*cp) &&
559 (value = isdigit(*cp) ? *cp - '0' : toupper(*cp) - 'A' + 10) < base) {
560 result = result * base + value;
570 static unsigned long prom_memparse(const char *ptr, const char **retptr)
572 unsigned long ret = prom_strtoul(ptr, retptr);
576 * We can't use a switch here because GCC *may* generate a
577 * jump table which won't work, because we're not running at
578 * the address we're linked at.
580 if ('G' == **retptr || 'g' == **retptr)
583 if ('M' == **retptr || 'm' == **retptr)
586 if ('K' == **retptr || 'k' == **retptr)
598 * Early parsing of the command line passed to the kernel, used for
599 * "mem=x" and the options that affect the iommu
601 static void __init early_cmdline_parse(void)
608 prom_cmd_line[0] = 0;
610 if ((long)prom.chosen > 0)
611 l = prom_getprop(prom.chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
612 #ifdef CONFIG_CMDLINE
613 if (l <= 0 || p[0] == '\0') /* dbl check */
614 strlcpy(prom_cmd_line,
615 CONFIG_CMDLINE, sizeof(prom_cmd_line));
616 #endif /* CONFIG_CMDLINE */
617 prom_printf("command line: %s\n", prom_cmd_line);
620 opt = strstr(prom_cmd_line, "iommu=");
622 prom_printf("iommu opt is: %s\n", opt);
624 while (*opt && *opt == ' ')
626 if (!strncmp(opt, "off", 3))
628 else if (!strncmp(opt, "force", 5))
629 prom_iommu_force_on = 1;
632 opt = strstr(prom_cmd_line, "mem=");
635 prom_memory_limit = prom_memparse(opt, (const char **)&opt);
637 /* Align to 16 MB == size of ppc64 large page */
638 prom_memory_limit = ALIGN(prom_memory_limit, 0x1000000);
642 opt = strstr(prom_cmd_line, "disable_radix");
645 if (*opt && *opt == '=') {
648 if (kstrtobool(++opt, &val))
649 prom_radix_disable = false;
651 prom_radix_disable = val;
653 prom_radix_disable = true;
655 if (prom_radix_disable)
656 prom_debug("Radix disabled from cmdline\n");
659 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
661 * The architecture vector has an array of PVR mask/value pairs,
662 * followed by # option vectors - 1, followed by the option vectors.
664 * See prom.h for the definition of the bits specified in the
665 * architecture vector.
668 /* Firmware expects the value to be n - 1, where n is the # of vectors */
669 #define NUM_VECTORS(n) ((n) - 1)
672 * Firmware expects 1 + n - 2, where n is the length of the option vector in
673 * bytes. The 1 accounts for the length byte itself, the - 2 .. ?
675 #define VECTOR_LENGTH(n) (1 + (n) - 2)
677 struct option_vector1 {
683 struct option_vector2 {
697 struct option_vector3 {
702 struct option_vector4 {
707 struct option_vector5 {
719 u8 platform_facilities;
730 struct option_vector6 {
736 struct ibm_arch_vec {
737 struct { u32 mask, val; } pvrs[12];
742 struct option_vector1 vec1;
745 struct option_vector2 vec2;
748 struct option_vector3 vec3;
751 struct option_vector4 vec4;
754 struct option_vector5 vec5;
757 struct option_vector6 vec6;
760 struct ibm_arch_vec __cacheline_aligned ibm_architecture_vec = {
763 .mask = cpu_to_be32(0xfffe0000), /* POWER5/POWER5+ */
764 .val = cpu_to_be32(0x003a0000),
767 .mask = cpu_to_be32(0xffff0000), /* POWER6 */
768 .val = cpu_to_be32(0x003e0000),
771 .mask = cpu_to_be32(0xffff0000), /* POWER7 */
772 .val = cpu_to_be32(0x003f0000),
775 .mask = cpu_to_be32(0xffff0000), /* POWER8E */
776 .val = cpu_to_be32(0x004b0000),
779 .mask = cpu_to_be32(0xffff0000), /* POWER8NVL */
780 .val = cpu_to_be32(0x004c0000),
783 .mask = cpu_to_be32(0xffff0000), /* POWER8 */
784 .val = cpu_to_be32(0x004d0000),
787 .mask = cpu_to_be32(0xffff0000), /* POWER9 */
788 .val = cpu_to_be32(0x004e0000),
791 .mask = cpu_to_be32(0xffffffff), /* all 3.00-compliant */
792 .val = cpu_to_be32(0x0f000005),
795 .mask = cpu_to_be32(0xffffffff), /* all 2.07-compliant */
796 .val = cpu_to_be32(0x0f000004),
799 .mask = cpu_to_be32(0xffffffff), /* all 2.06-compliant */
800 .val = cpu_to_be32(0x0f000003),
803 .mask = cpu_to_be32(0xffffffff), /* all 2.05-compliant */
804 .val = cpu_to_be32(0x0f000002),
807 .mask = cpu_to_be32(0xfffffffe), /* all 2.04-compliant and earlier */
808 .val = cpu_to_be32(0x0f000001),
812 .num_vectors = NUM_VECTORS(6),
814 .vec1_len = VECTOR_LENGTH(sizeof(struct option_vector1)),
817 .arch_versions = OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 |
818 OV1_PPC_2_04 | OV1_PPC_2_05 | OV1_PPC_2_06 | OV1_PPC_2_07,
819 .arch_versions3 = OV1_PPC_3_00,
822 .vec2_len = VECTOR_LENGTH(sizeof(struct option_vector2)),
823 /* option vector 2: Open Firmware options supported */
825 .byte1 = OV2_REAL_MODE,
827 .real_base = cpu_to_be32(0xffffffff),
828 .real_size = cpu_to_be32(0xffffffff),
829 .virt_base = cpu_to_be32(0xffffffff),
830 .virt_size = cpu_to_be32(0xffffffff),
831 .load_base = cpu_to_be32(0xffffffff),
832 .min_rma = cpu_to_be32(512), /* 512MB min RMA */
833 .min_load = cpu_to_be32(0xffffffff), /* full client load */
834 .min_rma_percent = 0, /* min RMA percentage of total RAM */
835 .max_pft_size = 48, /* max log_2(hash table size) */
838 .vec3_len = VECTOR_LENGTH(sizeof(struct option_vector3)),
839 /* option vector 3: processor options supported */
841 .byte1 = 0, /* don't ignore, don't halt */
842 .byte2 = OV3_FP | OV3_VMX | OV3_DFP,
845 .vec4_len = VECTOR_LENGTH(sizeof(struct option_vector4)),
846 /* option vector 4: IBM PAPR implementation */
848 .byte1 = 0, /* don't halt */
849 .min_vp_cap = OV4_MIN_ENT_CAP, /* minimum VP entitled capacity */
852 .vec5_len = VECTOR_LENGTH(sizeof(struct option_vector5)),
853 /* option vector 5: PAPR/OF options */
855 .byte1 = 0, /* don't ignore, don't halt */
856 .byte2 = OV5_FEAT(OV5_LPAR) | OV5_FEAT(OV5_SPLPAR) | OV5_FEAT(OV5_LARGE_PAGES) |
857 OV5_FEAT(OV5_DRCONF_MEMORY) | OV5_FEAT(OV5_DONATE_DEDICATE_CPU) |
858 #ifdef CONFIG_PCI_MSI
859 /* PCIe/MSI support. Without MSI full PCIe is not supported */
866 #ifdef CONFIG_PPC_SMLPAR
867 OV5_FEAT(OV5_CMO) | OV5_FEAT(OV5_XCMO),
871 .associativity = OV5_FEAT(OV5_TYPE1_AFFINITY) | OV5_FEAT(OV5_PRRN),
872 .bin_opts = OV5_FEAT(OV5_RESIZE_HPT) | OV5_FEAT(OV5_HP_EVT),
873 .micro_checkpoint = 0,
875 .max_cpus = cpu_to_be32(NR_CPUS), /* number of cores supported */
878 .platform_facilities = OV5_FEAT(OV5_PFO_HW_RNG) | OV5_FEAT(OV5_PFO_HW_ENCR) | OV5_FEAT(OV5_PFO_HW_842),
882 .byte22 = OV5_FEAT(OV5_DRMEM_V2),
889 /* option vector 6: IBM PAPR hints */
890 .vec6_len = VECTOR_LENGTH(sizeof(struct option_vector6)),
894 .os_name = OV6_LINUX,
898 /* Old method - ELF header with PT_NOTE sections only works on BE */
899 #ifdef __BIG_ENDIAN__
900 static struct fake_elf {
907 char name[8]; /* "PowerPC" */
921 char name[24]; /* "IBM,RPA-Client-Config" */
935 .e_ident = { 0x7f, 'E', 'L', 'F',
936 ELFCLASS32, ELFDATA2MSB, EV_CURRENT },
937 .e_type = ET_EXEC, /* yeah right */
939 .e_version = EV_CURRENT,
940 .e_phoff = offsetof(struct fake_elf, phdr),
941 .e_phentsize = sizeof(Elf32_Phdr),
947 .p_offset = offsetof(struct fake_elf, chrpnote),
948 .p_filesz = sizeof(struct chrpnote)
951 .p_offset = offsetof(struct fake_elf, rpanote),
952 .p_filesz = sizeof(struct rpanote)
956 .namesz = sizeof("PowerPC"),
957 .descsz = sizeof(struct chrpdesc),
961 .real_mode = ~0U, /* ~0 means "don't care" */
970 .namesz = sizeof("IBM,RPA-Client-Config"),
971 .descsz = sizeof(struct rpadesc),
973 .name = "IBM,RPA-Client-Config",
976 .min_rmo_size = 64, /* in megabytes */
977 .min_rmo_percent = 0,
978 .max_pft_size = 48, /* 2^48 bytes max PFT size */
985 #endif /* __BIG_ENDIAN__ */
987 static int __init prom_count_smt_threads(void)
993 /* Pick up th first CPU node we can find */
994 for (node = 0; prom_next_node(&node); ) {
996 prom_getprop(node, "device_type", type, sizeof(type));
998 if (strcmp(type, "cpu"))
1001 * There is an entry for each smt thread, each entry being
1002 * 4 bytes long. All cpus should have the same number of
1003 * smt threads, so return after finding the first.
1005 plen = prom_getproplen(node, "ibm,ppc-interrupt-server#s");
1006 if (plen == PROM_ERROR)
1009 prom_debug("Found %lu smt threads per core\n", (unsigned long)plen);
1012 if (plen < 1 || plen > 64) {
1013 prom_printf("Threads per core %lu out of bounds, assuming 1\n",
1014 (unsigned long)plen);
1019 prom_debug("No threads found, assuming 1 per core\n");
1025 static void __init prom_parse_mmu_model(u8 val,
1026 struct platform_support *support)
1029 case OV5_FEAT(OV5_MMU_DYNAMIC):
1030 case OV5_FEAT(OV5_MMU_EITHER): /* Either Available */
1031 prom_debug("MMU - either supported\n");
1032 support->radix_mmu = !prom_radix_disable;
1033 support->hash_mmu = true;
1035 case OV5_FEAT(OV5_MMU_RADIX): /* Only Radix */
1036 prom_debug("MMU - radix only\n");
1037 if (prom_radix_disable) {
1039 * If we __have__ to do radix, we're better off ignoring
1040 * the command line rather than not booting.
1042 prom_printf("WARNING: Ignoring cmdline option disable_radix\n");
1044 support->radix_mmu = true;
1046 case OV5_FEAT(OV5_MMU_HASH):
1047 prom_debug("MMU - hash only\n");
1048 support->hash_mmu = true;
1051 prom_debug("Unknown mmu support option: 0x%x\n", val);
1056 static void __init prom_parse_xive_model(u8 val,
1057 struct platform_support *support)
1060 case OV5_FEAT(OV5_XIVE_EITHER): /* Either Available */
1061 prom_debug("XIVE - either mode supported\n");
1062 support->xive = true;
1064 case OV5_FEAT(OV5_XIVE_EXPLOIT): /* Only Exploitation mode */
1065 prom_debug("XIVE - exploitation mode supported\n");
1066 support->xive = true;
1068 case OV5_FEAT(OV5_XIVE_LEGACY): /* Only Legacy mode */
1069 prom_debug("XIVE - legacy mode supported\n");
1072 prom_debug("Unknown xive support option: 0x%x\n", val);
1077 static void __init prom_parse_platform_support(u8 index, u8 val,
1078 struct platform_support *support)
1081 case OV5_INDX(OV5_MMU_SUPPORT): /* MMU Model */
1082 prom_parse_mmu_model(val & OV5_FEAT(OV5_MMU_SUPPORT), support);
1084 case OV5_INDX(OV5_RADIX_GTSE): /* Radix Extensions */
1085 if (val & OV5_FEAT(OV5_RADIX_GTSE)) {
1086 prom_debug("Radix - GTSE supported\n");
1087 support->radix_gtse = true;
1090 case OV5_INDX(OV5_XIVE_SUPPORT): /* Interrupt mode */
1091 prom_parse_xive_model(val & OV5_FEAT(OV5_XIVE_SUPPORT),
1097 static void __init prom_check_platform_support(void)
1099 struct platform_support supported = {
1102 .radix_gtse = false,
1105 int prop_len = prom_getproplen(prom.chosen,
1106 "ibm,arch-vec-5-platform-support");
1110 prom_debug("Found ibm,arch-vec-5-platform-support, len: %d\n",
1112 prom_getprop(prom.chosen, "ibm,arch-vec-5-platform-support",
1114 for (i = 0; i < prop_len; i += 2) {
1115 prom_debug("%d: index = 0x%x val = 0x%x\n", i / 2
1118 prom_parse_platform_support(vec[i], vec[i + 1],
1123 if (supported.radix_mmu && supported.radix_gtse &&
1124 IS_ENABLED(CONFIG_PPC_RADIX_MMU)) {
1125 /* Radix preferred - but we require GTSE for now */
1126 prom_debug("Asking for radix with GTSE\n");
1127 ibm_architecture_vec.vec5.mmu = OV5_FEAT(OV5_MMU_RADIX);
1128 ibm_architecture_vec.vec5.radix_ext = OV5_FEAT(OV5_RADIX_GTSE);
1129 } else if (supported.hash_mmu) {
1130 /* Default to hash mmu (if we can) */
1131 prom_debug("Asking for hash\n");
1132 ibm_architecture_vec.vec5.mmu = OV5_FEAT(OV5_MMU_HASH);
1134 /* We're probably on a legacy hypervisor */
1135 prom_debug("Assuming legacy hash support\n");
1138 if (supported.xive) {
1139 prom_debug("Asking for XIVE\n");
1140 ibm_architecture_vec.vec5.intarch = OV5_FEAT(OV5_XIVE_EXPLOIT);
1144 static void __init prom_send_capabilities(void)
1150 /* Check ibm,arch-vec-5-platform-support and fixup vec5 if required */
1151 prom_check_platform_support();
1153 root = call_prom("open", 1, 1, ADDR("/"));
1155 /* We need to tell the FW about the number of cores we support.
1157 * To do that, we count the number of threads on the first core
1158 * (we assume this is the same for all cores) and use it to
1162 cores = DIV_ROUND_UP(NR_CPUS, prom_count_smt_threads());
1163 prom_printf("Max number of cores passed to firmware: %lu (NR_CPUS = %lu)\n",
1166 ibm_architecture_vec.vec5.max_cpus = cpu_to_be32(cores);
1168 /* try calling the ibm,client-architecture-support method */
1169 prom_printf("Calling ibm,client-architecture-support...");
1170 if (call_prom_ret("call-method", 3, 2, &ret,
1171 ADDR("ibm,client-architecture-support"),
1173 ADDR(&ibm_architecture_vec)) == 0) {
1174 /* the call exists... */
1176 prom_printf("\nWARNING: ibm,client-architecture"
1177 "-support call FAILED!\n");
1178 call_prom("close", 1, 0, root);
1179 prom_printf(" done\n");
1182 call_prom("close", 1, 0, root);
1183 prom_printf(" not implemented\n");
1186 #ifdef __BIG_ENDIAN__
1190 /* no ibm,client-architecture-support call, try the old way */
1191 elfloader = call_prom("open", 1, 1,
1192 ADDR("/packages/elf-loader"));
1193 if (elfloader == 0) {
1194 prom_printf("couldn't open /packages/elf-loader\n");
1197 call_prom("call-method", 3, 1, ADDR("process-elf-header"),
1198 elfloader, ADDR(&fake_elf));
1199 call_prom("close", 1, 0, elfloader);
1201 #endif /* __BIG_ENDIAN__ */
1203 #endif /* #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) */
1206 * Memory allocation strategy... our layout is normally:
1208 * at 14Mb or more we have vmlinux, then a gap and initrd. In some
1209 * rare cases, initrd might end up being before the kernel though.
1210 * We assume this won't override the final kernel at 0, we have no
1211 * provision to handle that in this version, but it should hopefully
1214 * alloc_top is set to the top of RMO, eventually shrink down if the
1217 * alloc_bottom is set to the top of kernel/initrd
1219 * from there, allocations are done this way : rtas is allocated
1220 * topmost, and the device-tree is allocated from the bottom. We try
1221 * to grow the device-tree allocation as we progress. If we can't,
1222 * then we fail, we don't currently have a facility to restart
1223 * elsewhere, but that shouldn't be necessary.
1225 * Note that calls to reserve_mem have to be done explicitly, memory
1226 * allocated with either alloc_up or alloc_down isn't automatically
1232 * Allocates memory in the RMO upward from the kernel/initrd
1234 * When align is 0, this is a special case, it means to allocate in place
1235 * at the current location of alloc_bottom or fail (that is basically
1236 * extending the previous allocation). Used for the device-tree flattening
1238 static unsigned long __init alloc_up(unsigned long size, unsigned long align)
1240 unsigned long base = alloc_bottom;
1241 unsigned long addr = 0;
1244 base = _ALIGN_UP(base, align);
1245 prom_debug("alloc_up(%x, %x)\n", size, align);
1247 prom_panic("alloc_up() called with mem not initialized\n");
1250 base = _ALIGN_UP(alloc_bottom, align);
1252 base = alloc_bottom;
1254 for(; (base + size) <= alloc_top;
1255 base = _ALIGN_UP(base + 0x100000, align)) {
1256 prom_debug(" trying: 0x%x\n\r", base);
1257 addr = (unsigned long)prom_claim(base, size, 0);
1258 if (addr != PROM_ERROR && addr != 0)
1266 alloc_bottom = addr + size;
1268 prom_debug(" -> %x\n", addr);
1269 prom_debug(" alloc_bottom : %x\n", alloc_bottom);
1270 prom_debug(" alloc_top : %x\n", alloc_top);
1271 prom_debug(" alloc_top_hi : %x\n", alloc_top_high);
1272 prom_debug(" rmo_top : %x\n", rmo_top);
1273 prom_debug(" ram_top : %x\n", ram_top);
1279 * Allocates memory downward, either from top of RMO, or if highmem
1280 * is set, from the top of RAM. Note that this one doesn't handle
1281 * failures. It does claim memory if highmem is not set.
1283 static unsigned long __init alloc_down(unsigned long size, unsigned long align,
1286 unsigned long base, addr = 0;
1288 prom_debug("alloc_down(%x, %x, %s)\n", size, align,
1289 highmem ? "(high)" : "(low)");
1291 prom_panic("alloc_down() called with mem not initialized\n");
1294 /* Carve out storage for the TCE table. */
1295 addr = _ALIGN_DOWN(alloc_top_high - size, align);
1296 if (addr <= alloc_bottom)
1298 /* Will we bump into the RMO ? If yes, check out that we
1299 * didn't overlap existing allocations there, if we did,
1300 * we are dead, we must be the first in town !
1302 if (addr < rmo_top) {
1303 /* Good, we are first */
1304 if (alloc_top == rmo_top)
1305 alloc_top = rmo_top = addr;
1309 alloc_top_high = addr;
1313 base = _ALIGN_DOWN(alloc_top - size, align);
1314 for (; base > alloc_bottom;
1315 base = _ALIGN_DOWN(base - 0x100000, align)) {
1316 prom_debug(" trying: 0x%x\n\r", base);
1317 addr = (unsigned long)prom_claim(base, size, 0);
1318 if (addr != PROM_ERROR && addr != 0)
1327 prom_debug(" -> %x\n", addr);
1328 prom_debug(" alloc_bottom : %x\n", alloc_bottom);
1329 prom_debug(" alloc_top : %x\n", alloc_top);
1330 prom_debug(" alloc_top_hi : %x\n", alloc_top_high);
1331 prom_debug(" rmo_top : %x\n", rmo_top);
1332 prom_debug(" ram_top : %x\n", ram_top);
1338 * Parse a "reg" cell
1340 static unsigned long __init prom_next_cell(int s, cell_t **cellp)
1343 unsigned long r = 0;
1345 /* Ignore more than 2 cells */
1346 while (s > sizeof(unsigned long) / 4) {
1350 r = be32_to_cpu(*p++);
1354 r |= be32_to_cpu(*(p++));
1362 * Very dumb function for adding to the memory reserve list, but
1363 * we don't need anything smarter at this point
1365 * XXX Eventually check for collisions. They should NEVER happen.
1366 * If problems seem to show up, it would be a good start to track
1369 static void __init reserve_mem(u64 base, u64 size)
1371 u64 top = base + size;
1372 unsigned long cnt = mem_reserve_cnt;
1377 /* We need to always keep one empty entry so that we
1378 * have our terminator with "size" set to 0 since we are
1379 * dumb and just copy this entire array to the boot params
1381 base = _ALIGN_DOWN(base, PAGE_SIZE);
1382 top = _ALIGN_UP(top, PAGE_SIZE);
1385 if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))
1386 prom_panic("Memory reserve map exhausted !\n");
1387 mem_reserve_map[cnt].base = cpu_to_be64(base);
1388 mem_reserve_map[cnt].size = cpu_to_be64(size);
1389 mem_reserve_cnt = cnt + 1;
1393 * Initialize memory allocation mechanism, parse "memory" nodes and
1394 * obtain that way the top of memory and RMO to setup out local allocator
1396 static void __init prom_init_mem(void)
1399 char *path, type[64];
1406 * We iterate the memory nodes to find
1407 * 1) top of RMO (first node)
1410 val = cpu_to_be32(2);
1411 prom_getprop(prom.root, "#address-cells", &val, sizeof(val));
1412 rac = be32_to_cpu(val);
1413 val = cpu_to_be32(1);
1414 prom_getprop(prom.root, "#size-cells", &val, sizeof(rsc));
1415 rsc = be32_to_cpu(val);
1416 prom_debug("root_addr_cells: %x\n", rac);
1417 prom_debug("root_size_cells: %x\n", rsc);
1419 prom_debug("scanning memory:\n");
1420 path = prom_scratch;
1422 for (node = 0; prom_next_node(&node); ) {
1424 prom_getprop(node, "device_type", type, sizeof(type));
1428 * CHRP Longtrail machines have no device_type
1429 * on the memory node, so check the name instead...
1431 prom_getprop(node, "name", type, sizeof(type));
1433 if (strcmp(type, "memory"))
1436 plen = prom_getprop(node, "reg", regbuf, sizeof(regbuf));
1437 if (plen > sizeof(regbuf)) {
1438 prom_printf("memory node too large for buffer !\n");
1439 plen = sizeof(regbuf);
1442 endp = p + (plen / sizeof(cell_t));
1445 memset(path, 0, PROM_SCRATCH_SIZE);
1446 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
1447 prom_debug(" node %s :\n", path);
1448 #endif /* DEBUG_PROM */
1450 while ((endp - p) >= (rac + rsc)) {
1451 unsigned long base, size;
1453 base = prom_next_cell(rac, &p);
1454 size = prom_next_cell(rsc, &p);
1458 prom_debug(" %x %x\n", base, size);
1459 if (base == 0 && (of_platform & PLATFORM_LPAR))
1461 if ((base + size) > ram_top)
1462 ram_top = base + size;
1466 alloc_bottom = PAGE_ALIGN((unsigned long)&_end + 0x4000);
1469 * If prom_memory_limit is set we reduce the upper limits *except* for
1470 * alloc_top_high. This must be the real top of RAM so we can put
1474 alloc_top_high = ram_top;
1476 if (prom_memory_limit) {
1477 if (prom_memory_limit <= alloc_bottom) {
1478 prom_printf("Ignoring mem=%x <= alloc_bottom.\n",
1480 prom_memory_limit = 0;
1481 } else if (prom_memory_limit >= ram_top) {
1482 prom_printf("Ignoring mem=%x >= ram_top.\n",
1484 prom_memory_limit = 0;
1486 ram_top = prom_memory_limit;
1487 rmo_top = min(rmo_top, prom_memory_limit);
1492 * Setup our top alloc point, that is top of RMO or top of
1493 * segment 0 when running non-LPAR.
1494 * Some RS64 machines have buggy firmware where claims up at
1495 * 1GB fail. Cap at 768MB as a workaround.
1496 * Since 768MB is plenty of room, and we need to cap to something
1497 * reasonable on 32-bit, cap at 768MB on all machines.
1501 rmo_top = min(0x30000000ul, rmo_top);
1502 alloc_top = rmo_top;
1503 alloc_top_high = ram_top;
1506 * Check if we have an initrd after the kernel but still inside
1507 * the RMO. If we do move our bottom point to after it.
1509 if (prom_initrd_start &&
1510 prom_initrd_start < rmo_top &&
1511 prom_initrd_end > alloc_bottom)
1512 alloc_bottom = PAGE_ALIGN(prom_initrd_end);
1514 prom_printf("memory layout at init:\n");
1515 prom_printf(" memory_limit : %x (16 MB aligned)\n", prom_memory_limit);
1516 prom_printf(" alloc_bottom : %x\n", alloc_bottom);
1517 prom_printf(" alloc_top : %x\n", alloc_top);
1518 prom_printf(" alloc_top_hi : %x\n", alloc_top_high);
1519 prom_printf(" rmo_top : %x\n", rmo_top);
1520 prom_printf(" ram_top : %x\n", ram_top);
1523 static void __init prom_close_stdin(void)
1528 if (prom_getprop(prom.chosen, "stdin", &val, sizeof(val)) > 0) {
1529 stdin = be32_to_cpu(val);
1530 call_prom("close", 1, 0, stdin);
1534 #ifdef CONFIG_PPC_POWERNV
1536 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
1537 static u64 __initdata prom_opal_base;
1538 static u64 __initdata prom_opal_entry;
1542 * Allocate room for and instantiate OPAL
1544 static void __init prom_instantiate_opal(void)
1549 u64 size = 0, align = 0x10000;
1553 prom_debug("prom_instantiate_opal: start...\n");
1555 opal_node = call_prom("finddevice", 1, 1, ADDR("/ibm,opal"));
1556 prom_debug("opal_node: %x\n", opal_node);
1557 if (!PHANDLE_VALID(opal_node))
1561 prom_getprop(opal_node, "opal-runtime-size", &val64, sizeof(val64));
1562 size = be64_to_cpu(val64);
1566 prom_getprop(opal_node, "opal-runtime-alignment", &val64,sizeof(val64));
1567 align = be64_to_cpu(val64);
1569 base = alloc_down(size, align, 0);
1571 prom_printf("OPAL allocation failed !\n");
1575 opal_inst = call_prom("open", 1, 1, ADDR("/ibm,opal"));
1576 if (!IHANDLE_VALID(opal_inst)) {
1577 prom_printf("opening opal package failed (%x)\n", opal_inst);
1581 prom_printf("instantiating opal at 0x%x...", base);
1583 if (call_prom_ret("call-method", 4, 3, rets,
1584 ADDR("load-opal-runtime"),
1586 base >> 32, base & 0xffffffff) != 0
1587 || (rets[0] == 0 && rets[1] == 0)) {
1588 prom_printf(" failed\n");
1591 entry = (((u64)rets[0]) << 32) | rets[1];
1593 prom_printf(" done\n");
1595 reserve_mem(base, size);
1597 prom_debug("opal base = 0x%x\n", base);
1598 prom_debug("opal align = 0x%x\n", align);
1599 prom_debug("opal entry = 0x%x\n", entry);
1600 prom_debug("opal size = 0x%x\n", (long)size);
1602 prom_setprop(opal_node, "/ibm,opal", "opal-base-address",
1603 &base, sizeof(base));
1604 prom_setprop(opal_node, "/ibm,opal", "opal-entry-address",
1605 &entry, sizeof(entry));
1607 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
1608 prom_opal_base = base;
1609 prom_opal_entry = entry;
1611 prom_debug("prom_instantiate_opal: end...\n");
1614 #endif /* CONFIG_PPC_POWERNV */
1617 * Allocate room for and instantiate RTAS
1619 static void __init prom_instantiate_rtas(void)
1623 u32 base, entry = 0;
1627 prom_debug("prom_instantiate_rtas: start...\n");
1629 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1630 prom_debug("rtas_node: %x\n", rtas_node);
1631 if (!PHANDLE_VALID(rtas_node))
1635 prom_getprop(rtas_node, "rtas-size", &val, sizeof(size));
1636 size = be32_to_cpu(val);
1640 base = alloc_down(size, PAGE_SIZE, 0);
1642 prom_panic("Could not allocate memory for RTAS\n");
1644 rtas_inst = call_prom("open", 1, 1, ADDR("/rtas"));
1645 if (!IHANDLE_VALID(rtas_inst)) {
1646 prom_printf("opening rtas package failed (%x)\n", rtas_inst);
1650 prom_printf("instantiating rtas at 0x%x...", base);
1652 if (call_prom_ret("call-method", 3, 2, &entry,
1653 ADDR("instantiate-rtas"),
1654 rtas_inst, base) != 0
1656 prom_printf(" failed\n");
1659 prom_printf(" done\n");
1661 reserve_mem(base, size);
1663 val = cpu_to_be32(base);
1664 prom_setprop(rtas_node, "/rtas", "linux,rtas-base",
1666 val = cpu_to_be32(entry);
1667 prom_setprop(rtas_node, "/rtas", "linux,rtas-entry",
1670 /* Check if it supports "query-cpu-stopped-state" */
1671 if (prom_getprop(rtas_node, "query-cpu-stopped-state",
1672 &val, sizeof(val)) != PROM_ERROR)
1673 rtas_has_query_cpu_stopped = true;
1675 prom_debug("rtas base = 0x%x\n", base);
1676 prom_debug("rtas entry = 0x%x\n", entry);
1677 prom_debug("rtas size = 0x%x\n", (long)size);
1679 prom_debug("prom_instantiate_rtas: end...\n");
1684 * Allocate room for and instantiate Stored Measurement Log (SML)
1686 static void __init prom_instantiate_sml(void)
1688 phandle ibmvtpm_node;
1689 ihandle ibmvtpm_inst;
1690 u32 entry = 0, size = 0, succ = 0;
1694 prom_debug("prom_instantiate_sml: start...\n");
1696 ibmvtpm_node = call_prom("finddevice", 1, 1, ADDR("/vdevice/vtpm"));
1697 prom_debug("ibmvtpm_node: %x\n", ibmvtpm_node);
1698 if (!PHANDLE_VALID(ibmvtpm_node))
1701 ibmvtpm_inst = call_prom("open", 1, 1, ADDR("/vdevice/vtpm"));
1702 if (!IHANDLE_VALID(ibmvtpm_inst)) {
1703 prom_printf("opening vtpm package failed (%x)\n", ibmvtpm_inst);
1707 if (prom_getprop(ibmvtpm_node, "ibm,sml-efi-reformat-supported",
1708 &val, sizeof(val)) != PROM_ERROR) {
1709 if (call_prom_ret("call-method", 2, 2, &succ,
1710 ADDR("reformat-sml-to-efi-alignment"),
1711 ibmvtpm_inst) != 0 || succ == 0) {
1712 prom_printf("Reformat SML to EFI alignment failed\n");
1716 if (call_prom_ret("call-method", 2, 2, &size,
1717 ADDR("sml-get-allocated-size"),
1718 ibmvtpm_inst) != 0 || size == 0) {
1719 prom_printf("SML get allocated size failed\n");
1723 if (call_prom_ret("call-method", 2, 2, &size,
1724 ADDR("sml-get-handover-size"),
1725 ibmvtpm_inst) != 0 || size == 0) {
1726 prom_printf("SML get handover size failed\n");
1731 base = alloc_down(size, PAGE_SIZE, 0);
1733 prom_panic("Could not allocate memory for sml\n");
1735 prom_printf("instantiating sml at 0x%x...", base);
1737 memset((void *)base, 0, size);
1739 if (call_prom_ret("call-method", 4, 2, &entry,
1740 ADDR("sml-handover"),
1741 ibmvtpm_inst, size, base) != 0 || entry == 0) {
1742 prom_printf("SML handover failed\n");
1745 prom_printf(" done\n");
1747 reserve_mem(base, size);
1749 prom_setprop(ibmvtpm_node, "/vdevice/vtpm", "linux,sml-base",
1750 &base, sizeof(base));
1751 prom_setprop(ibmvtpm_node, "/vdevice/vtpm", "linux,sml-size",
1752 &size, sizeof(size));
1754 prom_debug("sml base = 0x%x\n", base);
1755 prom_debug("sml size = 0x%x\n", (long)size);
1757 prom_debug("prom_instantiate_sml: end...\n");
1761 * Allocate room for and initialize TCE tables
1763 #ifdef __BIG_ENDIAN__
1764 static void __init prom_initialize_tce_table(void)
1768 char compatible[64], type[64], model[64];
1769 char *path = prom_scratch;
1771 u32 minalign, minsize;
1772 u64 tce_entry, *tce_entryp;
1773 u64 local_alloc_top, local_alloc_bottom;
1779 prom_debug("starting prom_initialize_tce_table\n");
1781 /* Cache current top of allocs so we reserve a single block */
1782 local_alloc_top = alloc_top_high;
1783 local_alloc_bottom = local_alloc_top;
1785 /* Search all nodes looking for PHBs. */
1786 for (node = 0; prom_next_node(&node); ) {
1790 prom_getprop(node, "compatible",
1791 compatible, sizeof(compatible));
1792 prom_getprop(node, "device_type", type, sizeof(type));
1793 prom_getprop(node, "model", model, sizeof(model));
1795 if ((type[0] == 0) || (strstr(type, "pci") == NULL))
1798 /* Keep the old logic intact to avoid regression. */
1799 if (compatible[0] != 0) {
1800 if ((strstr(compatible, "python") == NULL) &&
1801 (strstr(compatible, "Speedwagon") == NULL) &&
1802 (strstr(compatible, "Winnipeg") == NULL))
1804 } else if (model[0] != 0) {
1805 if ((strstr(model, "ython") == NULL) &&
1806 (strstr(model, "peedwagon") == NULL) &&
1807 (strstr(model, "innipeg") == NULL))
1811 if (prom_getprop(node, "tce-table-minalign", &minalign,
1812 sizeof(minalign)) == PROM_ERROR)
1814 if (prom_getprop(node, "tce-table-minsize", &minsize,
1815 sizeof(minsize)) == PROM_ERROR)
1816 minsize = 4UL << 20;
1819 * Even though we read what OF wants, we just set the table
1820 * size to 4 MB. This is enough to map 2GB of PCI DMA space.
1821 * By doing this, we avoid the pitfalls of trying to DMA to
1822 * MMIO space and the DMA alias hole.
1824 minsize = 4UL << 20;
1826 /* Align to the greater of the align or size */
1827 align = max(minalign, minsize);
1828 base = alloc_down(minsize, align, 1);
1830 prom_panic("ERROR, cannot find space for TCE table.\n");
1831 if (base < local_alloc_bottom)
1832 local_alloc_bottom = base;
1834 /* It seems OF doesn't null-terminate the path :-( */
1835 memset(path, 0, PROM_SCRATCH_SIZE);
1836 /* Call OF to setup the TCE hardware */
1837 if (call_prom("package-to-path", 3, 1, node,
1838 path, PROM_SCRATCH_SIZE-1) == PROM_ERROR) {
1839 prom_printf("package-to-path failed\n");
1842 /* Save away the TCE table attributes for later use. */
1843 prom_setprop(node, path, "linux,tce-base", &base, sizeof(base));
1844 prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize));
1846 prom_debug("TCE table: %s\n", path);
1847 prom_debug("\tnode = 0x%x\n", node);
1848 prom_debug("\tbase = 0x%x\n", base);
1849 prom_debug("\tsize = 0x%x\n", minsize);
1851 /* Initialize the table to have a one-to-one mapping
1852 * over the allocated size.
1854 tce_entryp = (u64 *)base;
1855 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) {
1856 tce_entry = (i << PAGE_SHIFT);
1858 *tce_entryp = tce_entry;
1861 prom_printf("opening PHB %s", path);
1862 phb_node = call_prom("open", 1, 1, path);
1864 prom_printf("... failed\n");
1866 prom_printf("... done\n");
1868 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
1869 phb_node, -1, minsize,
1870 (u32) base, (u32) (base >> 32));
1871 call_prom("close", 1, 0, phb_node);
1874 reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);
1876 /* These are only really needed if there is a memory limit in
1877 * effect, but we don't know so export them always. */
1878 prom_tce_alloc_start = local_alloc_bottom;
1879 prom_tce_alloc_end = local_alloc_top;
1881 /* Flag the first invalid entry */
1882 prom_debug("ending prom_initialize_tce_table\n");
1884 #endif /* __BIG_ENDIAN__ */
1885 #endif /* CONFIG_PPC64 */
1888 * With CHRP SMP we need to use the OF to start the other processors.
1889 * We can't wait until smp_boot_cpus (the OF is trashed by then)
1890 * so we have to put the processors into a holding pattern controlled
1891 * by the kernel (not OF) before we destroy the OF.
1893 * This uses a chunk of low memory, puts some holding pattern
1894 * code there and sends the other processors off to there until
1895 * smp_boot_cpus tells them to do something. The holding pattern
1896 * checks that address until its cpu # is there, when it is that
1897 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care
1898 * of setting those values.
1900 * We also use physical address 0x4 here to tell when a cpu
1901 * is in its holding pattern code.
1906 * We want to reference the copy of __secondary_hold_* in the
1907 * 0 - 0x100 address range
1909 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff)
1911 static void __init prom_hold_cpus(void)
1916 unsigned long *spinloop
1917 = (void *) LOW_ADDR(__secondary_hold_spinloop);
1918 unsigned long *acknowledge
1919 = (void *) LOW_ADDR(__secondary_hold_acknowledge);
1920 unsigned long secondary_hold = LOW_ADDR(__secondary_hold);
1923 * On pseries, if RTAS supports "query-cpu-stopped-state",
1924 * we skip this stage, the CPUs will be started by the
1925 * kernel using RTAS.
1927 if ((of_platform == PLATFORM_PSERIES ||
1928 of_platform == PLATFORM_PSERIES_LPAR) &&
1929 rtas_has_query_cpu_stopped) {
1930 prom_printf("prom_hold_cpus: skipped\n");
1934 prom_debug("prom_hold_cpus: start...\n");
1935 prom_debug(" 1) spinloop = 0x%x\n", (unsigned long)spinloop);
1936 prom_debug(" 1) *spinloop = 0x%x\n", *spinloop);
1937 prom_debug(" 1) acknowledge = 0x%x\n",
1938 (unsigned long)acknowledge);
1939 prom_debug(" 1) *acknowledge = 0x%x\n", *acknowledge);
1940 prom_debug(" 1) secondary_hold = 0x%x\n", secondary_hold);
1942 /* Set the common spinloop variable, so all of the secondary cpus
1943 * will block when they are awakened from their OF spinloop.
1944 * This must occur for both SMP and non SMP kernels, since OF will
1945 * be trashed when we move the kernel.
1950 for (node = 0; prom_next_node(&node); ) {
1951 unsigned int cpu_no;
1955 prom_getprop(node, "device_type", type, sizeof(type));
1956 if (strcmp(type, "cpu") != 0)
1959 /* Skip non-configured cpus. */
1960 if (prom_getprop(node, "status", type, sizeof(type)) > 0)
1961 if (strcmp(type, "okay") != 0)
1964 reg = cpu_to_be32(-1); /* make sparse happy */
1965 prom_getprop(node, "reg", ®, sizeof(reg));
1966 cpu_no = be32_to_cpu(reg);
1968 prom_debug("cpu hw idx = %lu\n", cpu_no);
1970 /* Init the acknowledge var which will be reset by
1971 * the secondary cpu when it awakens from its OF
1974 *acknowledge = (unsigned long)-1;
1976 if (cpu_no != prom.cpu) {
1977 /* Primary Thread of non-boot cpu or any thread */
1978 prom_printf("starting cpu hw idx %lu... ", cpu_no);
1979 call_prom("start-cpu", 3, 0, node,
1980 secondary_hold, cpu_no);
1982 for (i = 0; (i < 100000000) &&
1983 (*acknowledge == ((unsigned long)-1)); i++ )
1986 if (*acknowledge == cpu_no)
1987 prom_printf("done\n");
1989 prom_printf("failed: %x\n", *acknowledge);
1993 prom_printf("boot cpu hw idx %lu\n", cpu_no);
1994 #endif /* CONFIG_SMP */
1997 prom_debug("prom_hold_cpus: end...\n");
2001 static void __init prom_init_client_services(unsigned long pp)
2003 /* Get a handle to the prom entry point before anything else */
2006 /* get a handle for the stdout device */
2007 prom.chosen = call_prom("finddevice", 1, 1, ADDR("/chosen"));
2008 if (!PHANDLE_VALID(prom.chosen))
2009 prom_panic("cannot find chosen"); /* msg won't be printed :( */
2011 /* get device tree root */
2012 prom.root = call_prom("finddevice", 1, 1, ADDR("/"));
2013 if (!PHANDLE_VALID(prom.root))
2014 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
2021 * For really old powermacs, we need to map things we claim.
2022 * For that, we need the ihandle of the mmu.
2023 * Also, on the longtrail, we need to work around other bugs.
2025 static void __init prom_find_mmu(void)
2030 oprom = call_prom("finddevice", 1, 1, ADDR("/openprom"));
2031 if (!PHANDLE_VALID(oprom))
2033 if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0)
2035 version[sizeof(version) - 1] = 0;
2036 /* XXX might need to add other versions here */
2037 if (strcmp(version, "Open Firmware, 1.0.5") == 0)
2038 of_workarounds = OF_WA_CLAIM;
2039 else if (strncmp(version, "FirmWorks,3.", 12) == 0) {
2040 of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL;
2041 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
2044 prom.memory = call_prom("open", 1, 1, ADDR("/memory"));
2045 prom_getprop(prom.chosen, "mmu", &prom.mmumap,
2046 sizeof(prom.mmumap));
2047 prom.mmumap = be32_to_cpu(prom.mmumap);
2048 if (!IHANDLE_VALID(prom.memory) || !IHANDLE_VALID(prom.mmumap))
2049 of_workarounds &= ~OF_WA_CLAIM; /* hmmm */
2052 #define prom_find_mmu()
2055 static void __init prom_init_stdout(void)
2057 char *path = of_stdout_device;
2059 phandle stdout_node;
2062 if (prom_getprop(prom.chosen, "stdout", &val, sizeof(val)) <= 0)
2063 prom_panic("cannot find stdout");
2065 prom.stdout = be32_to_cpu(val);
2067 /* Get the full OF pathname of the stdout device */
2068 memset(path, 0, 256);
2069 call_prom("instance-to-path", 3, 1, prom.stdout, path, 255);
2070 prom_printf("OF stdout device is: %s\n", of_stdout_device);
2071 prom_setprop(prom.chosen, "/chosen", "linux,stdout-path",
2072 path, strlen(path) + 1);
2074 /* instance-to-package fails on PA-Semi */
2075 stdout_node = call_prom("instance-to-package", 1, 1, prom.stdout);
2076 if (stdout_node != PROM_ERROR) {
2077 val = cpu_to_be32(stdout_node);
2078 prom_setprop(prom.chosen, "/chosen", "linux,stdout-package",
2081 /* If it's a display, note it */
2082 memset(type, 0, sizeof(type));
2083 prom_getprop(stdout_node, "device_type", type, sizeof(type));
2084 if (strcmp(type, "display") == 0)
2085 prom_setprop(stdout_node, path, "linux,boot-display", NULL, 0);
2089 static int __init prom_find_machine_type(void)
2098 /* Look for a PowerMac or a Cell */
2099 len = prom_getprop(prom.root, "compatible",
2100 compat, sizeof(compat)-1);
2104 char *p = &compat[i];
2108 if (strstr(p, "Power Macintosh") ||
2109 strstr(p, "MacRISC"))
2110 return PLATFORM_POWERMAC;
2112 /* We must make sure we don't detect the IBM Cell
2113 * blades as pSeries due to some firmware issues,
2116 if (strstr(p, "IBM,CBEA") ||
2117 strstr(p, "IBM,CPBW-1.0"))
2118 return PLATFORM_GENERIC;
2119 #endif /* CONFIG_PPC64 */
2124 /* Try to detect OPAL */
2125 if (PHANDLE_VALID(call_prom("finddevice", 1, 1, ADDR("/ibm,opal"))))
2126 return PLATFORM_OPAL;
2128 /* Try to figure out if it's an IBM pSeries or any other
2129 * PAPR compliant platform. We assume it is if :
2130 * - /device_type is "chrp" (please, do NOT use that for future
2134 len = prom_getprop(prom.root, "device_type",
2135 compat, sizeof(compat)-1);
2137 return PLATFORM_GENERIC;
2138 if (strcmp(compat, "chrp"))
2139 return PLATFORM_GENERIC;
2141 /* Default to pSeries. We need to know if we are running LPAR */
2142 rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
2143 if (!PHANDLE_VALID(rtas))
2144 return PLATFORM_GENERIC;
2145 x = prom_getproplen(rtas, "ibm,hypertas-functions");
2146 if (x != PROM_ERROR) {
2147 prom_debug("Hypertas detected, assuming LPAR !\n");
2148 return PLATFORM_PSERIES_LPAR;
2150 return PLATFORM_PSERIES;
2152 return PLATFORM_GENERIC;
2156 static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
2158 return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);
2162 * If we have a display that we don't know how to drive,
2163 * we will want to try to execute OF's open method for it
2164 * later. However, OF will probably fall over if we do that
2165 * we've taken over the MMU.
2166 * So we check whether we will need to open the display,
2167 * and if so, open it now.
2169 static void __init prom_check_displays(void)
2171 char type[16], *path;
2176 static unsigned char default_colors[] = {
2194 const unsigned char *clut;
2196 prom_debug("Looking for displays\n");
2197 for (node = 0; prom_next_node(&node); ) {
2198 memset(type, 0, sizeof(type));
2199 prom_getprop(node, "device_type", type, sizeof(type));
2200 if (strcmp(type, "display") != 0)
2203 /* It seems OF doesn't null-terminate the path :-( */
2204 path = prom_scratch;
2205 memset(path, 0, PROM_SCRATCH_SIZE);
2208 * leave some room at the end of the path for appending extra
2211 if (call_prom("package-to-path", 3, 1, node, path,
2212 PROM_SCRATCH_SIZE-10) == PROM_ERROR)
2214 prom_printf("found display : %s, opening... ", path);
2216 ih = call_prom("open", 1, 1, path);
2218 prom_printf("failed\n");
2223 prom_printf("done\n");
2224 prom_setprop(node, path, "linux,opened", NULL, 0);
2226 /* Setup a usable color table when the appropriate
2227 * method is available. Should update this to set-colors */
2228 clut = default_colors;
2229 for (i = 0; i < 16; i++, clut += 3)
2230 if (prom_set_color(ih, i, clut[0], clut[1],
2234 #ifdef CONFIG_LOGO_LINUX_CLUT224
2235 clut = PTRRELOC(logo_linux_clut224.clut);
2236 for (i = 0; i < logo_linux_clut224.clutsize; i++, clut += 3)
2237 if (prom_set_color(ih, i + 32, clut[0], clut[1],
2240 #endif /* CONFIG_LOGO_LINUX_CLUT224 */
2242 #ifdef CONFIG_PPC_EARLY_DEBUG_BOOTX
2243 if (prom_getprop(node, "linux,boot-display", NULL, 0) !=
2245 u32 width, height, pitch, addr;
2247 prom_printf("Setting btext !\n");
2248 prom_getprop(node, "width", &width, 4);
2249 prom_getprop(node, "height", &height, 4);
2250 prom_getprop(node, "linebytes", &pitch, 4);
2251 prom_getprop(node, "address", &addr, 4);
2252 prom_printf("W=%d H=%d LB=%d addr=0x%x\n",
2253 width, height, pitch, addr);
2254 btext_setup_display(width, height, 8, pitch, addr);
2256 #endif /* CONFIG_PPC_EARLY_DEBUG_BOOTX */
2261 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */
2262 static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end,
2263 unsigned long needed, unsigned long align)
2267 *mem_start = _ALIGN(*mem_start, align);
2268 while ((*mem_start + needed) > *mem_end) {
2269 unsigned long room, chunk;
2271 prom_debug("Chunk exhausted, claiming more at %x...\n",
2273 room = alloc_top - alloc_bottom;
2274 if (room > DEVTREE_CHUNK_SIZE)
2275 room = DEVTREE_CHUNK_SIZE;
2276 if (room < PAGE_SIZE)
2277 prom_panic("No memory for flatten_device_tree "
2279 chunk = alloc_up(room, 0);
2281 prom_panic("No memory for flatten_device_tree "
2282 "(claim failed)\n");
2283 *mem_end = chunk + room;
2286 ret = (void *)*mem_start;
2287 *mem_start += needed;
2292 #define dt_push_token(token, mem_start, mem_end) do { \
2293 void *room = make_room(mem_start, mem_end, 4, 4); \
2294 *(__be32 *)room = cpu_to_be32(token); \
2297 static unsigned long __init dt_find_string(char *str)
2301 s = os = (char *)dt_string_start;
2303 while (s < (char *)dt_string_end) {
2304 if (strcmp(s, str) == 0)
2312 * The Open Firmware 1275 specification states properties must be 31 bytes or
2313 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
2315 #define MAX_PROPERTY_NAME 64
2317 static void __init scan_dt_build_strings(phandle node,
2318 unsigned long *mem_start,
2319 unsigned long *mem_end)
2321 char *prev_name, *namep, *sstart;
2325 sstart = (char *)dt_string_start;
2327 /* get and store all property names */
2330 /* 64 is max len of name including nul. */
2331 namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1);
2332 if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) {
2333 /* No more nodes: unwind alloc */
2334 *mem_start = (unsigned long)namep;
2339 if (strcmp(namep, "name") == 0) {
2340 *mem_start = (unsigned long)namep;
2344 /* get/create string entry */
2345 soff = dt_find_string(namep);
2347 *mem_start = (unsigned long)namep;
2348 namep = sstart + soff;
2350 /* Trim off some if we can */
2351 *mem_start = (unsigned long)namep + strlen(namep) + 1;
2352 dt_string_end = *mem_start;
2357 /* do all our children */
2358 child = call_prom("child", 1, 1, node);
2359 while (child != 0) {
2360 scan_dt_build_strings(child, mem_start, mem_end);
2361 child = call_prom("peer", 1, 1, child);
2365 static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
2366 unsigned long *mem_end)
2369 char *namep, *prev_name, *sstart, *p, *ep, *lp, *path;
2371 unsigned char *valp;
2372 static char pname[MAX_PROPERTY_NAME];
2373 int l, room, has_phandle = 0;
2375 dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);
2377 /* get the node's full name */
2378 namep = (char *)*mem_start;
2379 room = *mem_end - *mem_start;
2382 l = call_prom("package-to-path", 3, 1, node, namep, room);
2384 /* Didn't fit? Get more room. */
2386 if (l >= *mem_end - *mem_start)
2387 namep = make_room(mem_start, mem_end, l+1, 1);
2388 call_prom("package-to-path", 3, 1, node, namep, l);
2392 /* Fixup an Apple bug where they have bogus \0 chars in the
2393 * middle of the path in some properties, and extract
2394 * the unit name (everything after the last '/').
2396 for (lp = p = namep, ep = namep + l; p < ep; p++) {
2403 *mem_start = _ALIGN((unsigned long)lp + 1, 4);
2406 /* get it again for debugging */
2407 path = prom_scratch;
2408 memset(path, 0, PROM_SCRATCH_SIZE);
2409 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
2411 /* get and store all properties */
2413 sstart = (char *)dt_string_start;
2415 if (call_prom("nextprop", 3, 1, node, prev_name,
2420 if (strcmp(pname, "name") == 0) {
2425 /* find string offset */
2426 soff = dt_find_string(pname);
2428 prom_printf("WARNING: Can't find string index for"
2429 " <%s>, node %s\n", pname, path);
2432 prev_name = sstart + soff;
2435 l = call_prom("getproplen", 2, 1, node, pname);
2438 if (l == PROM_ERROR)
2441 /* push property head */
2442 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2443 dt_push_token(l, mem_start, mem_end);
2444 dt_push_token(soff, mem_start, mem_end);
2446 /* push property content */
2447 valp = make_room(mem_start, mem_end, l, 4);
2448 call_prom("getprop", 4, 1, node, pname, valp, l);
2449 *mem_start = _ALIGN(*mem_start, 4);
2451 if (!strcmp(pname, "phandle"))
2455 /* Add a "linux,phandle" property if no "phandle" property already
2456 * existed (can happen with OPAL)
2459 soff = dt_find_string("linux,phandle");
2461 prom_printf("WARNING: Can't find string index for"
2462 " <linux-phandle> node %s\n", path);
2464 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2465 dt_push_token(4, mem_start, mem_end);
2466 dt_push_token(soff, mem_start, mem_end);
2467 valp = make_room(mem_start, mem_end, 4, 4);
2468 *(__be32 *)valp = cpu_to_be32(node);
2472 /* do all our children */
2473 child = call_prom("child", 1, 1, node);
2474 while (child != 0) {
2475 scan_dt_build_struct(child, mem_start, mem_end);
2476 child = call_prom("peer", 1, 1, child);
2479 dt_push_token(OF_DT_END_NODE, mem_start, mem_end);
2482 static void __init flatten_device_tree(void)
2485 unsigned long mem_start, mem_end, room;
2486 struct boot_param_header *hdr;
2491 * Check how much room we have between alloc top & bottom (+/- a
2492 * few pages), crop to 1MB, as this is our "chunk" size
2494 room = alloc_top - alloc_bottom - 0x4000;
2495 if (room > DEVTREE_CHUNK_SIZE)
2496 room = DEVTREE_CHUNK_SIZE;
2497 prom_debug("starting device tree allocs at %x\n", alloc_bottom);
2499 /* Now try to claim that */
2500 mem_start = (unsigned long)alloc_up(room, PAGE_SIZE);
2502 prom_panic("Can't allocate initial device-tree chunk\n");
2503 mem_end = mem_start + room;
2505 /* Get root of tree */
2506 root = call_prom("peer", 1, 1, (phandle)0);
2507 if (root == (phandle)0)
2508 prom_panic ("couldn't get device tree root\n");
2510 /* Build header and make room for mem rsv map */
2511 mem_start = _ALIGN(mem_start, 4);
2512 hdr = make_room(&mem_start, &mem_end,
2513 sizeof(struct boot_param_header), 4);
2514 dt_header_start = (unsigned long)hdr;
2515 rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8);
2517 /* Start of strings */
2518 mem_start = PAGE_ALIGN(mem_start);
2519 dt_string_start = mem_start;
2520 mem_start += 4; /* hole */
2522 /* Add "linux,phandle" in there, we'll need it */
2523 namep = make_room(&mem_start, &mem_end, 16, 1);
2524 strcpy(namep, "linux,phandle");
2525 mem_start = (unsigned long)namep + strlen(namep) + 1;
2527 /* Build string array */
2528 prom_printf("Building dt strings...\n");
2529 scan_dt_build_strings(root, &mem_start, &mem_end);
2530 dt_string_end = mem_start;
2532 /* Build structure */
2533 mem_start = PAGE_ALIGN(mem_start);
2534 dt_struct_start = mem_start;
2535 prom_printf("Building dt structure...\n");
2536 scan_dt_build_struct(root, &mem_start, &mem_end);
2537 dt_push_token(OF_DT_END, &mem_start, &mem_end);
2538 dt_struct_end = PAGE_ALIGN(mem_start);
2541 hdr->boot_cpuid_phys = cpu_to_be32(prom.cpu);
2542 hdr->magic = cpu_to_be32(OF_DT_HEADER);
2543 hdr->totalsize = cpu_to_be32(dt_struct_end - dt_header_start);
2544 hdr->off_dt_struct = cpu_to_be32(dt_struct_start - dt_header_start);
2545 hdr->off_dt_strings = cpu_to_be32(dt_string_start - dt_header_start);
2546 hdr->dt_strings_size = cpu_to_be32(dt_string_end - dt_string_start);
2547 hdr->off_mem_rsvmap = cpu_to_be32(((unsigned long)rsvmap) - dt_header_start);
2548 hdr->version = cpu_to_be32(OF_DT_VERSION);
2549 /* Version 16 is not backward compatible */
2550 hdr->last_comp_version = cpu_to_be32(0x10);
2552 /* Copy the reserve map in */
2553 memcpy(rsvmap, mem_reserve_map, sizeof(mem_reserve_map));
2558 prom_printf("reserved memory map:\n");
2559 for (i = 0; i < mem_reserve_cnt; i++)
2560 prom_printf(" %x - %x\n",
2561 be64_to_cpu(mem_reserve_map[i].base),
2562 be64_to_cpu(mem_reserve_map[i].size));
2565 /* Bump mem_reserve_cnt to cause further reservations to fail
2566 * since it's too late.
2568 mem_reserve_cnt = MEM_RESERVE_MAP_SIZE;
2570 prom_printf("Device tree strings 0x%x -> 0x%x\n",
2571 dt_string_start, dt_string_end);
2572 prom_printf("Device tree struct 0x%x -> 0x%x\n",
2573 dt_struct_start, dt_struct_end);
2576 #ifdef CONFIG_PPC_MAPLE
2577 /* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property.
2578 * The values are bad, and it doesn't even have the right number of cells. */
2579 static void __init fixup_device_tree_maple(void)
2582 u32 rloc = 0x01002000; /* IO space; PCI device = 4 */
2586 name = "/ht@0/isa@4";
2587 isa = call_prom("finddevice", 1, 1, ADDR(name));
2588 if (!PHANDLE_VALID(isa)) {
2589 name = "/ht@0/isa@6";
2590 isa = call_prom("finddevice", 1, 1, ADDR(name));
2591 rloc = 0x01003000; /* IO space; PCI device = 6 */
2593 if (!PHANDLE_VALID(isa))
2596 if (prom_getproplen(isa, "ranges") != 12)
2598 if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges))
2602 if (isa_ranges[0] != 0x1 ||
2603 isa_ranges[1] != 0xf4000000 ||
2604 isa_ranges[2] != 0x00010000)
2607 prom_printf("Fixing up bogus ISA range on Maple/Apache...\n");
2609 isa_ranges[0] = 0x1;
2610 isa_ranges[1] = 0x0;
2611 isa_ranges[2] = rloc;
2612 isa_ranges[3] = 0x0;
2613 isa_ranges[4] = 0x0;
2614 isa_ranges[5] = 0x00010000;
2615 prom_setprop(isa, name, "ranges",
2616 isa_ranges, sizeof(isa_ranges));
2619 #define CPC925_MC_START 0xf8000000
2620 #define CPC925_MC_LENGTH 0x1000000
2621 /* The values for memory-controller don't have right number of cells */
2622 static void __init fixup_device_tree_maple_memory_controller(void)
2626 char *name = "/hostbridge@f8000000";
2629 mc = call_prom("finddevice", 1, 1, ADDR(name));
2630 if (!PHANDLE_VALID(mc))
2633 if (prom_getproplen(mc, "reg") != 8)
2636 prom_getprop(prom.root, "#address-cells", &ac, sizeof(ac));
2637 prom_getprop(prom.root, "#size-cells", &sc, sizeof(sc));
2638 if ((ac != 2) || (sc != 2))
2641 if (prom_getprop(mc, "reg", mc_reg, sizeof(mc_reg)) == PROM_ERROR)
2644 if (mc_reg[0] != CPC925_MC_START || mc_reg[1] != CPC925_MC_LENGTH)
2647 prom_printf("Fixing up bogus hostbridge on Maple...\n");
2650 mc_reg[1] = CPC925_MC_START;
2652 mc_reg[3] = CPC925_MC_LENGTH;
2653 prom_setprop(mc, name, "reg", mc_reg, sizeof(mc_reg));
2656 #define fixup_device_tree_maple()
2657 #define fixup_device_tree_maple_memory_controller()
2660 #ifdef CONFIG_PPC_CHRP
2662 * Pegasos and BriQ lacks the "ranges" property in the isa node
2663 * Pegasos needs decimal IRQ 14/15, not hexadecimal
2664 * Pegasos has the IDE configured in legacy mode, but advertised as native
2666 static void __init fixup_device_tree_chrp(void)
2670 u32 rloc = 0x01006000; /* IO space; PCI device = 12 */
2674 name = "/pci@80000000/isa@c";
2675 ph = call_prom("finddevice", 1, 1, ADDR(name));
2676 if (!PHANDLE_VALID(ph)) {
2677 name = "/pci@ff500000/isa@6";
2678 ph = call_prom("finddevice", 1, 1, ADDR(name));
2679 rloc = 0x01003000; /* IO space; PCI device = 6 */
2681 if (PHANDLE_VALID(ph)) {
2682 rc = prom_getproplen(ph, "ranges");
2683 if (rc == 0 || rc == PROM_ERROR) {
2684 prom_printf("Fixing up missing ISA range on Pegasos...\n");
2691 prop[5] = 0x00010000;
2692 prom_setprop(ph, name, "ranges", prop, sizeof(prop));
2696 name = "/pci@80000000/ide@C,1";
2697 ph = call_prom("finddevice", 1, 1, ADDR(name));
2698 if (PHANDLE_VALID(ph)) {
2699 prom_printf("Fixing up IDE interrupt on Pegasos...\n");
2702 prom_setprop(ph, name, "interrupts", prop, 2*sizeof(u32));
2703 prom_printf("Fixing up IDE class-code on Pegasos...\n");
2704 rc = prom_getprop(ph, "class-code", prop, sizeof(u32));
2705 if (rc == sizeof(u32)) {
2707 prom_setprop(ph, name, "class-code", prop, sizeof(u32));
2712 #define fixup_device_tree_chrp()
2715 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
2716 static void __init fixup_device_tree_pmac(void)
2718 phandle u3, i2c, mpic;
2723 /* Some G5s have a missing interrupt definition, fix it up here */
2724 u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
2725 if (!PHANDLE_VALID(u3))
2727 i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
2728 if (!PHANDLE_VALID(i2c))
2730 mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
2731 if (!PHANDLE_VALID(mpic))
2734 /* check if proper rev of u3 */
2735 if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev))
2738 if (u3_rev < 0x35 || u3_rev > 0x39)
2740 /* does it need fixup ? */
2741 if (prom_getproplen(i2c, "interrupts") > 0)
2744 prom_printf("fixing up bogus interrupts for u3 i2c...\n");
2746 /* interrupt on this revision of u3 is number 0 and level */
2749 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts",
2750 &interrupts, sizeof(interrupts));
2752 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
2753 &parent, sizeof(parent));
2756 #define fixup_device_tree_pmac()
2759 #ifdef CONFIG_PPC_EFIKA
2761 * The MPC5200 FEC driver requires an phy-handle property to tell it how
2762 * to talk to the phy. If the phy-handle property is missing, then this
2763 * function is called to add the appropriate nodes and link it to the
2766 static void __init fixup_device_tree_efika_add_phy(void)
2772 /* Check if /builtin/ethernet exists - bail if it doesn't */
2773 node = call_prom("finddevice", 1, 1, ADDR("/builtin/ethernet"));
2774 if (!PHANDLE_VALID(node))
2777 /* Check if the phy-handle property exists - bail if it does */
2778 rv = prom_getprop(node, "phy-handle", prop, sizeof(prop));
2783 * At this point the ethernet device doesn't have a phy described.
2784 * Now we need to add the missing phy node and linkage
2787 /* Check for an MDIO bus node - if missing then create one */
2788 node = call_prom("finddevice", 1, 1, ADDR("/builtin/mdio"));
2789 if (!PHANDLE_VALID(node)) {
2790 prom_printf("Adding Ethernet MDIO node\n");
2791 call_prom("interpret", 1, 1,
2792 " s\" /builtin\" find-device"
2794 " 1 encode-int s\" #address-cells\" property"
2795 " 0 encode-int s\" #size-cells\" property"
2796 " s\" mdio\" device-name"
2797 " s\" fsl,mpc5200b-mdio\" encode-string"
2798 " s\" compatible\" property"
2799 " 0xf0003000 0x400 reg"
2801 " 0x5 encode-int encode+"
2802 " 0x3 encode-int encode+"
2803 " s\" interrupts\" property"
2807 /* Check for a PHY device node - if missing then create one and
2808 * give it's phandle to the ethernet node */
2809 node = call_prom("finddevice", 1, 1,
2810 ADDR("/builtin/mdio/ethernet-phy"));
2811 if (!PHANDLE_VALID(node)) {
2812 prom_printf("Adding Ethernet PHY node\n");
2813 call_prom("interpret", 1, 1,
2814 " s\" /builtin/mdio\" find-device"
2816 " s\" ethernet-phy\" device-name"
2817 " 0x10 encode-int s\" reg\" property"
2821 " s\" /builtin/ethernet\" find-device"
2823 " s\" phy-handle\" property"
2828 static void __init fixup_device_tree_efika(void)
2830 int sound_irq[3] = { 2, 2, 0 };
2831 int bcomm_irq[3*16] = { 3,0,0, 3,1,0, 3,2,0, 3,3,0,
2832 3,4,0, 3,5,0, 3,6,0, 3,7,0,
2833 3,8,0, 3,9,0, 3,10,0, 3,11,0,
2834 3,12,0, 3,13,0, 3,14,0, 3,15,0 };
2839 /* Check if we're really running on a EFIKA */
2840 node = call_prom("finddevice", 1, 1, ADDR("/"));
2841 if (!PHANDLE_VALID(node))
2844 rv = prom_getprop(node, "model", prop, sizeof(prop));
2845 if (rv == PROM_ERROR)
2847 if (strcmp(prop, "EFIKA5K2"))
2850 prom_printf("Applying EFIKA device tree fixups\n");
2852 /* Claiming to be 'chrp' is death */
2853 node = call_prom("finddevice", 1, 1, ADDR("/"));
2854 rv = prom_getprop(node, "device_type", prop, sizeof(prop));
2855 if (rv != PROM_ERROR && (strcmp(prop, "chrp") == 0))
2856 prom_setprop(node, "/", "device_type", "efika", sizeof("efika"));
2858 /* CODEGEN,description is exposed in /proc/cpuinfo so
2860 rv = prom_getprop(node, "CODEGEN,description", prop, sizeof(prop));
2861 if (rv != PROM_ERROR && (strstr(prop, "CHRP")))
2862 prom_setprop(node, "/", "CODEGEN,description",
2863 "Efika 5200B PowerPC System",
2864 sizeof("Efika 5200B PowerPC System"));
2866 /* Fixup bestcomm interrupts property */
2867 node = call_prom("finddevice", 1, 1, ADDR("/builtin/bestcomm"));
2868 if (PHANDLE_VALID(node)) {
2869 len = prom_getproplen(node, "interrupts");
2871 prom_printf("Fixing bestcomm interrupts property\n");
2872 prom_setprop(node, "/builtin/bestcom", "interrupts",
2873 bcomm_irq, sizeof(bcomm_irq));
2877 /* Fixup sound interrupts property */
2878 node = call_prom("finddevice", 1, 1, ADDR("/builtin/sound"));
2879 if (PHANDLE_VALID(node)) {
2880 rv = prom_getprop(node, "interrupts", prop, sizeof(prop));
2881 if (rv == PROM_ERROR) {
2882 prom_printf("Adding sound interrupts property\n");
2883 prom_setprop(node, "/builtin/sound", "interrupts",
2884 sound_irq, sizeof(sound_irq));
2888 /* Make sure ethernet phy-handle property exists */
2889 fixup_device_tree_efika_add_phy();
2892 #define fixup_device_tree_efika()
2895 #ifdef CONFIG_PPC_PASEMI_NEMO
2897 * CFE supplied on Nemo is broken in several ways, biggest
2898 * problem is that it reassigns ISA interrupts to unused mpic ints.
2899 * Add an interrupt-controller property for the io-bridge to use
2900 * and correct the ints so we can attach them to an irq_domain
2902 static void __init fixup_device_tree_pasemi(void)
2904 u32 interrupts[2], parent, rval, val = 0;
2905 char *name, *pci_name;
2908 /* Find the root pci node */
2909 name = "/pxp@0,e0000000";
2910 iob = call_prom("finddevice", 1, 1, ADDR(name));
2911 if (!PHANDLE_VALID(iob))
2914 /* check if interrupt-controller node set yet */
2915 if (prom_getproplen(iob, "interrupt-controller") !=PROM_ERROR)
2918 prom_printf("adding interrupt-controller property for SB600...\n");
2920 prom_setprop(iob, name, "interrupt-controller", &val, 0);
2922 pci_name = "/pxp@0,e0000000/pci@11";
2923 node = call_prom("finddevice", 1, 1, ADDR(pci_name));
2926 for( ; prom_next_node(&node); ) {
2927 /* scan each node for one with an interrupt */
2928 if (!PHANDLE_VALID(node))
2931 rval = prom_getproplen(node, "interrupts");
2932 if (rval == 0 || rval == PROM_ERROR)
2935 prom_getprop(node, "interrupts", &interrupts, sizeof(interrupts));
2936 if ((interrupts[0] < 212) || (interrupts[0] > 222))
2939 /* found a node, update both interrupts and interrupt-parent */
2940 if ((interrupts[0] >= 212) && (interrupts[0] <= 215))
2941 interrupts[0] -= 203;
2942 if ((interrupts[0] >= 216) && (interrupts[0] <= 220))
2943 interrupts[0] -= 213;
2944 if (interrupts[0] == 221)
2946 if (interrupts[0] == 222)
2949 prom_setprop(node, pci_name, "interrupts", interrupts,
2950 sizeof(interrupts));
2951 prom_setprop(node, pci_name, "interrupt-parent", &parent,
2956 * The io-bridge has device_type set to 'io-bridge' change it to 'isa'
2957 * so that generic isa-bridge code can add the SB600 and its on-board
2960 name = "/pxp@0,e0000000/io-bridge@0";
2961 iob = call_prom("finddevice", 1, 1, ADDR(name));
2962 if (!PHANDLE_VALID(iob))
2965 /* device_type is already set, just change it. */
2967 prom_printf("Changing device_type of SB600 node...\n");
2969 prom_setprop(iob, name, "device_type", "isa", sizeof("isa"));
2971 #else /* !CONFIG_PPC_PASEMI_NEMO */
2972 static inline void fixup_device_tree_pasemi(void) { }
2975 static void __init fixup_device_tree(void)
2977 fixup_device_tree_maple();
2978 fixup_device_tree_maple_memory_controller();
2979 fixup_device_tree_chrp();
2980 fixup_device_tree_pmac();
2981 fixup_device_tree_efika();
2982 fixup_device_tree_pasemi();
2985 static void __init prom_find_boot_cpu(void)
2992 if (prom_getprop(prom.chosen, "cpu", &rval, sizeof(rval)) <= 0)
2994 prom_cpu = be32_to_cpu(rval);
2996 cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);
2998 if (!PHANDLE_VALID(cpu_pkg))
3001 prom_getprop(cpu_pkg, "reg", &rval, sizeof(rval));
3002 prom.cpu = be32_to_cpu(rval);
3004 prom_debug("Booting CPU hw index = %lu\n", prom.cpu);
3007 static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
3009 #ifdef CONFIG_BLK_DEV_INITRD
3010 if (r3 && r4 && r4 != 0xdeadbeef) {
3013 prom_initrd_start = is_kernel_addr(r3) ? __pa(r3) : r3;
3014 prom_initrd_end = prom_initrd_start + r4;
3016 val = cpu_to_be64(prom_initrd_start);
3017 prom_setprop(prom.chosen, "/chosen", "linux,initrd-start",
3019 val = cpu_to_be64(prom_initrd_end);
3020 prom_setprop(prom.chosen, "/chosen", "linux,initrd-end",
3023 reserve_mem(prom_initrd_start,
3024 prom_initrd_end - prom_initrd_start);
3026 prom_debug("initrd_start=0x%x\n", prom_initrd_start);
3027 prom_debug("initrd_end=0x%x\n", prom_initrd_end);
3029 #endif /* CONFIG_BLK_DEV_INITRD */
3033 #ifdef CONFIG_RELOCATABLE
3034 static void reloc_toc(void)
3038 static void unreloc_toc(void)
3042 static void __reloc_toc(unsigned long offset, unsigned long nr_entries)
3045 unsigned long *toc_entry;
3047 /* Get the start of the TOC by using r2 directly. */
3048 asm volatile("addi %0,2,-0x8000" : "=b" (toc_entry));
3050 for (i = 0; i < nr_entries; i++) {
3051 *toc_entry = *toc_entry + offset;
3056 static void reloc_toc(void)
3058 unsigned long offset = reloc_offset();
3059 unsigned long nr_entries =
3060 (__prom_init_toc_end - __prom_init_toc_start) / sizeof(long);
3062 __reloc_toc(offset, nr_entries);
3067 static void unreloc_toc(void)
3069 unsigned long offset = reloc_offset();
3070 unsigned long nr_entries =
3071 (__prom_init_toc_end - __prom_init_toc_start) / sizeof(long);
3075 __reloc_toc(-offset, nr_entries);
3081 * We enter here early on, when the Open Firmware prom is still
3082 * handling exceptions and the MMU hash table for us.
3085 unsigned long __init prom_init(unsigned long r3, unsigned long r4,
3087 unsigned long r6, unsigned long r7,
3088 unsigned long kbase)
3093 unsigned long offset = reloc_offset();
3100 * First zero the BSS
3102 memset(&__bss_start, 0, __bss_stop - __bss_start);
3105 * Init interface to Open Firmware, get some node references,
3108 prom_init_client_services(pp);
3111 * See if this OF is old enough that we need to do explicit maps
3112 * and other workarounds
3117 * Init prom stdout device
3121 prom_printf("Preparing to boot %s", linux_banner);
3124 * Get default machine type. At this point, we do not differentiate
3125 * between pSeries SMP and pSeries LPAR
3127 of_platform = prom_find_machine_type();
3128 prom_printf("Detected machine type: %x\n", of_platform);
3130 #ifndef CONFIG_NONSTATIC_KERNEL
3131 /* Bail if this is a kdump kernel. */
3132 if (PHYSICAL_START > 0)
3133 prom_panic("Error: You can't boot a kdump kernel from OF!\n");
3137 * Check for an initrd
3139 prom_check_initrd(r3, r4);
3142 * Do early parsing of command line
3144 early_cmdline_parse();
3146 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
3148 * On pSeries, inform the firmware about our capabilities
3150 if (of_platform == PLATFORM_PSERIES ||
3151 of_platform == PLATFORM_PSERIES_LPAR)
3152 prom_send_capabilities();
3156 * Copy the CPU hold code
3158 if (of_platform != PLATFORM_POWERMAC)
3159 copy_and_flush(0, kbase, 0x100, 0);
3162 * Initialize memory management within prom_init
3167 * Determine which cpu is actually running right _now_
3169 prom_find_boot_cpu();
3172 * Initialize display devices
3174 prom_check_displays();
3176 #if defined(CONFIG_PPC64) && defined(__BIG_ENDIAN__)
3178 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
3179 * that uses the allocator, we need to make sure we get the top of memory
3180 * available for us here...
3182 if (of_platform == PLATFORM_PSERIES)
3183 prom_initialize_tce_table();
3187 * On non-powermacs, try to instantiate RTAS. PowerMacs don't
3188 * have a usable RTAS implementation.
3190 if (of_platform != PLATFORM_POWERMAC &&
3191 of_platform != PLATFORM_OPAL)
3192 prom_instantiate_rtas();
3194 #ifdef CONFIG_PPC_POWERNV
3195 if (of_platform == PLATFORM_OPAL)
3196 prom_instantiate_opal();
3197 #endif /* CONFIG_PPC_POWERNV */
3200 /* instantiate sml */
3201 prom_instantiate_sml();
3205 * On non-powermacs, put all CPUs in spin-loops.
3207 * PowerMacs use a different mechanism to spin CPUs
3209 * (This must be done after instanciating RTAS)
3211 if (of_platform != PLATFORM_POWERMAC &&
3212 of_platform != PLATFORM_OPAL)
3216 * Fill in some infos for use by the kernel later on
3218 if (prom_memory_limit) {
3219 __be64 val = cpu_to_be64(prom_memory_limit);
3220 prom_setprop(prom.chosen, "/chosen", "linux,memory-limit",
3225 prom_setprop(prom.chosen, "/chosen", "linux,iommu-off",
3228 if (prom_iommu_force_on)
3229 prom_setprop(prom.chosen, "/chosen", "linux,iommu-force-on",
3232 if (prom_tce_alloc_start) {
3233 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-start",
3234 &prom_tce_alloc_start,
3235 sizeof(prom_tce_alloc_start));
3236 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-end",
3237 &prom_tce_alloc_end,
3238 sizeof(prom_tce_alloc_end));
3243 * Fixup any known bugs in the device-tree
3245 fixup_device_tree();
3248 * Now finally create the flattened device-tree
3250 prom_printf("copying OF device tree...\n");
3251 flatten_device_tree();
3254 * in case stdin is USB and still active on IBM machines...
3255 * Unfortunately quiesce crashes on some powermacs if we have
3256 * closed stdin already (in particular the powerbook 101). It
3257 * appears that the OPAL version of OFW doesn't like it either.
3259 if (of_platform != PLATFORM_POWERMAC &&
3260 of_platform != PLATFORM_OPAL)
3264 * Call OF "quiesce" method to shut down pending DMA's from
3267 prom_printf("Quiescing Open Firmware ...\n");
3268 call_prom("quiesce", 0, 0);
3271 * And finally, call the kernel passing it the flattened device
3272 * tree and NULL as r5, thus triggering the new entry point which
3273 * is common to us and kexec
3275 hdr = dt_header_start;
3277 /* Don't print anything after quiesce under OPAL, it crashes OFW */
3278 if (of_platform != PLATFORM_OPAL) {
3279 prom_printf("Booting Linux via __start() @ 0x%lx ...\n", kbase);
3280 prom_debug("->dt_header_start=0x%x\n", hdr);
3284 reloc_got2(-offset);
3289 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
3290 /* OPAL early debug gets the OPAL base & entry in r8 and r9 */
3291 __start(hdr, kbase, 0, 0, 0,
3292 prom_opal_base, prom_opal_entry);
3294 __start(hdr, kbase, 0, 0, 0, 0, 0);