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/delay.h>
31 #include <linux/initrd.h>
32 #include <linux/bitops.h>
36 #include <asm/processor.h>
41 #include <asm/pgtable.h>
42 #include <asm/iommu.h>
43 #include <asm/btext.h>
44 #include <asm/sections.h>
45 #include <asm/machdep.h>
47 #include <asm/asm-prototypes.h>
49 #include <linux/linux_logo.h>
52 * Eventually bump that one up
54 #define DEVTREE_CHUNK_SIZE 0x100000
57 * This is the size of the local memory reserve map that gets copied
58 * into the boot params passed to the kernel. That size is totally
59 * flexible as the kernel just reads the list until it encounters an
60 * entry with size 0, so it can be changed without breaking binary
63 #define MEM_RESERVE_MAP_SIZE 8
66 * prom_init() is called very early on, before the kernel text
67 * and data have been mapped to KERNELBASE. At this point the code
68 * is running at whatever address it has been loaded at.
69 * On ppc32 we compile with -mrelocatable, which means that references
70 * to extern and static variables get relocated automatically.
71 * ppc64 objects are always relocatable, we just need to relocate the
74 * Because OF may have mapped I/O devices into the area starting at
75 * KERNELBASE, particularly on CHRP machines, we can't safely call
76 * OF once the kernel has been mapped to KERNELBASE. Therefore all
77 * OF calls must be done within prom_init().
79 * ADDR is used in calls to call_prom. The 4th and following
80 * arguments to call_prom should be 32-bit values.
81 * On ppc64, 64 bit values are truncated to 32 bits (and
82 * fortunately don't get interpreted as two arguments).
84 #define ADDR(x) (u32)(unsigned long)(x)
87 #define OF_WORKAROUNDS 0
89 #define OF_WORKAROUNDS of_workarounds
93 #define OF_WA_CLAIM 1 /* do phys/virt claim separately, then map */
94 #define OF_WA_LONGTRAIL 2 /* work around longtrail bugs */
96 #define PROM_BUG() do { \
97 prom_printf("kernel BUG at %s line 0x%x!\n", \
98 __FILE__, __LINE__); \
99 __asm__ __volatile__(".long " BUG_ILLEGAL_INSTR); \
103 #define prom_debug(x...) prom_printf(x)
105 #define prom_debug(x...) do { } while (0)
109 typedef u32 prom_arg_t;
127 struct mem_map_entry {
132 typedef __be32 cell_t;
134 extern void __start(unsigned long r3, unsigned long r4, unsigned long r5,
135 unsigned long r6, unsigned long r7, unsigned long r8,
139 extern int enter_prom(struct prom_args *args, unsigned long entry);
141 static inline int enter_prom(struct prom_args *args, unsigned long entry)
143 return ((int (*)(struct prom_args *))entry)(args);
147 extern void copy_and_flush(unsigned long dest, unsigned long src,
148 unsigned long size, unsigned long offset);
151 static struct prom_t __initdata prom;
153 static unsigned long prom_entry __initdata;
155 #define PROM_SCRATCH_SIZE 256
157 static char __initdata of_stdout_device[256];
158 static char __initdata prom_scratch[PROM_SCRATCH_SIZE];
160 static unsigned long __initdata dt_header_start;
161 static unsigned long __initdata dt_struct_start, dt_struct_end;
162 static unsigned long __initdata dt_string_start, dt_string_end;
164 static unsigned long __initdata prom_initrd_start, prom_initrd_end;
167 static int __initdata prom_iommu_force_on;
168 static int __initdata prom_iommu_off;
169 static unsigned long __initdata prom_tce_alloc_start;
170 static unsigned long __initdata prom_tce_alloc_end;
173 static bool prom_radix_disable __initdata = !IS_ENABLED(CONFIG_PPC_RADIX_MMU_DEFAULT);
175 struct platform_support {
182 /* Platforms codes are now obsolete in the kernel. Now only used within this
183 * file and ultimately gone too. Feel free to change them if you need, they
184 * are not shared with anything outside of this file anymore
186 #define PLATFORM_PSERIES 0x0100
187 #define PLATFORM_PSERIES_LPAR 0x0101
188 #define PLATFORM_LPAR 0x0001
189 #define PLATFORM_POWERMAC 0x0400
190 #define PLATFORM_GENERIC 0x0500
191 #define PLATFORM_OPAL 0x0600
193 static int __initdata of_platform;
195 static char __initdata prom_cmd_line[COMMAND_LINE_SIZE];
197 static unsigned long __initdata prom_memory_limit;
199 static unsigned long __initdata alloc_top;
200 static unsigned long __initdata alloc_top_high;
201 static unsigned long __initdata alloc_bottom;
202 static unsigned long __initdata rmo_top;
203 static unsigned long __initdata ram_top;
205 static struct mem_map_entry __initdata mem_reserve_map[MEM_RESERVE_MAP_SIZE];
206 static int __initdata mem_reserve_cnt;
208 static cell_t __initdata regbuf[1024];
210 static bool rtas_has_query_cpu_stopped;
214 * Error results ... some OF calls will return "-1" on error, some
215 * will return 0, some will return either. To simplify, here are
216 * macros to use with any ihandle or phandle return value to check if
220 #define PROM_ERROR (-1u)
221 #define PHANDLE_VALID(p) ((p) != 0 && (p) != PROM_ERROR)
222 #define IHANDLE_VALID(i) ((i) != 0 && (i) != PROM_ERROR)
225 /* This is the one and *ONLY* place where we actually call open
229 static int __init call_prom(const char *service, int nargs, int nret, ...)
232 struct prom_args args;
235 args.service = cpu_to_be32(ADDR(service));
236 args.nargs = cpu_to_be32(nargs);
237 args.nret = cpu_to_be32(nret);
239 va_start(list, nret);
240 for (i = 0; i < nargs; i++)
241 args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));
244 for (i = 0; i < nret; i++)
245 args.args[nargs+i] = 0;
247 if (enter_prom(&args, prom_entry) < 0)
250 return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;
253 static int __init call_prom_ret(const char *service, int nargs, int nret,
254 prom_arg_t *rets, ...)
257 struct prom_args args;
260 args.service = cpu_to_be32(ADDR(service));
261 args.nargs = cpu_to_be32(nargs);
262 args.nret = cpu_to_be32(nret);
264 va_start(list, rets);
265 for (i = 0; i < nargs; i++)
266 args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));
269 for (i = 0; i < nret; i++)
270 args.args[nargs+i] = 0;
272 if (enter_prom(&args, prom_entry) < 0)
276 for (i = 1; i < nret; ++i)
277 rets[i-1] = be32_to_cpu(args.args[nargs+i]);
279 return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;
283 static void __init prom_print(const char *msg)
287 if (prom.stdout == 0)
290 for (p = msg; *p != 0; p = q) {
291 for (q = p; *q != 0 && *q != '\n'; ++q)
294 call_prom("write", 3, 1, prom.stdout, p, q - p);
298 call_prom("write", 3, 1, prom.stdout, ADDR("\r\n"), 2);
304 * Both prom_print_hex & prom_print_dec takes an unsigned long as input so that
305 * we do not need __udivdi3 or __umoddi3 on 32bits.
307 static void __init prom_print_hex(unsigned long val)
309 int i, nibbles = sizeof(val)*2;
310 char buf[sizeof(val)*2+1];
312 for (i = nibbles-1; i >= 0; i--) {
313 buf[i] = (val & 0xf) + '0';
315 buf[i] += ('a'-'0'-10);
319 call_prom("write", 3, 1, prom.stdout, buf, nibbles);
322 /* max number of decimal digits in an unsigned long */
324 static void __init prom_print_dec(unsigned long val)
327 char buf[UL_DIGITS+1];
329 for (i = UL_DIGITS-1; i >= 0; i--) {
330 buf[i] = (val % 10) + '0';
335 /* shift stuff down */
336 size = UL_DIGITS - i;
337 call_prom("write", 3, 1, prom.stdout, buf+i, size);
341 static void __init prom_printf(const char *format, ...)
343 const char *p, *q, *s;
349 va_start(args, format);
350 for (p = format; *p != 0; p = q) {
351 for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
354 call_prom("write", 3, 1, prom.stdout, p, q - p);
359 call_prom("write", 3, 1, prom.stdout,
373 s = va_arg(args, const char *);
380 v = va_arg(args, unsigned int);
383 v = va_arg(args, unsigned long);
387 v = va_arg(args, unsigned long long);
396 v = va_arg(args, unsigned int);
399 v = va_arg(args, unsigned long);
403 v = va_arg(args, unsigned long long);
412 vs = va_arg(args, int);
415 vs = va_arg(args, long);
419 vs = va_arg(args, long long);
434 static unsigned int __init prom_claim(unsigned long virt, unsigned long size,
438 if (align == 0 && (OF_WORKAROUNDS & OF_WA_CLAIM)) {
440 * Old OF requires we claim physical and virtual separately
441 * and then map explicitly (assuming virtual mode)
446 ret = call_prom_ret("call-method", 5, 2, &result,
447 ADDR("claim"), prom.memory,
449 if (ret != 0 || result == -1)
451 ret = call_prom_ret("call-method", 5, 2, &result,
452 ADDR("claim"), prom.mmumap,
455 call_prom("call-method", 4, 1, ADDR("release"),
456 prom.memory, size, virt);
459 /* the 0x12 is M (coherence) + PP == read/write */
460 call_prom("call-method", 6, 1,
461 ADDR("map"), prom.mmumap, 0x12, size, virt, virt);
464 return call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size,
468 static void __init __attribute__((noreturn)) prom_panic(const char *reason)
471 /* Do not call exit because it clears the screen on pmac
472 * it also causes some sort of double-fault on early pmacs */
473 if (of_platform == PLATFORM_POWERMAC)
476 /* ToDo: should put up an SRC here on pSeries */
477 call_prom("exit", 0, 0);
479 for (;;) /* should never get here */
484 static int __init prom_next_node(phandle *nodep)
488 if ((node = *nodep) != 0
489 && (*nodep = call_prom("child", 1, 1, node)) != 0)
491 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
494 if ((node = call_prom("parent", 1, 1, node)) == 0)
496 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
501 static inline int prom_getprop(phandle node, const char *pname,
502 void *value, size_t valuelen)
504 return call_prom("getprop", 4, 1, node, ADDR(pname),
505 (u32)(unsigned long) value, (u32) valuelen);
508 static inline int prom_getproplen(phandle node, const char *pname)
510 return call_prom("getproplen", 2, 1, node, ADDR(pname));
513 static void add_string(char **str, const char *q)
523 static char *tohex(unsigned int x)
525 static char digits[] = "0123456789abcdef";
526 static char result[9];
533 result[i] = digits[x & 0xf];
535 } while (x != 0 && i > 0);
539 static int __init prom_setprop(phandle node, const char *nodename,
540 const char *pname, void *value, size_t valuelen)
544 if (!(OF_WORKAROUNDS & OF_WA_LONGTRAIL))
545 return call_prom("setprop", 4, 1, node, ADDR(pname),
546 (u32)(unsigned long) value, (u32) valuelen);
548 /* gah... setprop doesn't work on longtrail, have to use interpret */
550 add_string(&p, "dev");
551 add_string(&p, nodename);
552 add_string(&p, tohex((u32)(unsigned long) value));
553 add_string(&p, tohex(valuelen));
554 add_string(&p, tohex(ADDR(pname)));
555 add_string(&p, tohex(strlen(pname)));
556 add_string(&p, "property");
558 return call_prom("interpret", 1, 1, (u32)(unsigned long) cmd);
561 /* We can't use the standard versions because of relocation headaches. */
562 #define isxdigit(c) (('0' <= (c) && (c) <= '9') \
563 || ('a' <= (c) && (c) <= 'f') \
564 || ('A' <= (c) && (c) <= 'F'))
566 #define isdigit(c) ('0' <= (c) && (c) <= '9')
567 #define islower(c) ('a' <= (c) && (c) <= 'z')
568 #define toupper(c) (islower(c) ? ((c) - 'a' + 'A') : (c))
570 static unsigned long prom_strtoul(const char *cp, const char **endp)
572 unsigned long result = 0, base = 10, value;
577 if (toupper(*cp) == 'X') {
583 while (isxdigit(*cp) &&
584 (value = isdigit(*cp) ? *cp - '0' : toupper(*cp) - 'A' + 10) < base) {
585 result = result * base + value;
595 static unsigned long prom_memparse(const char *ptr, const char **retptr)
597 unsigned long ret = prom_strtoul(ptr, retptr);
601 * We can't use a switch here because GCC *may* generate a
602 * jump table which won't work, because we're not running at
603 * the address we're linked at.
605 if ('G' == **retptr || 'g' == **retptr)
608 if ('M' == **retptr || 'm' == **retptr)
611 if ('K' == **retptr || 'k' == **retptr)
623 * Early parsing of the command line passed to the kernel, used for
624 * "mem=x" and the options that affect the iommu
626 static void __init early_cmdline_parse(void)
631 int l __maybe_unused = 0;
633 prom_cmd_line[0] = 0;
635 if ((long)prom.chosen > 0)
636 l = prom_getprop(prom.chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
637 #ifdef CONFIG_CMDLINE
638 if (l <= 0 || p[0] == '\0') /* dbl check */
639 strlcpy(prom_cmd_line,
640 CONFIG_CMDLINE, sizeof(prom_cmd_line));
641 #endif /* CONFIG_CMDLINE */
642 prom_printf("command line: %s\n", prom_cmd_line);
645 opt = strstr(prom_cmd_line, "iommu=");
647 prom_printf("iommu opt is: %s\n", opt);
649 while (*opt && *opt == ' ')
651 if (!strncmp(opt, "off", 3))
653 else if (!strncmp(opt, "force", 5))
654 prom_iommu_force_on = 1;
657 opt = strstr(prom_cmd_line, "mem=");
660 prom_memory_limit = prom_memparse(opt, (const char **)&opt);
662 /* Align to 16 MB == size of ppc64 large page */
663 prom_memory_limit = ALIGN(prom_memory_limit, 0x1000000);
667 opt = strstr(prom_cmd_line, "disable_radix");
670 if (*opt && *opt == '=') {
673 if (kstrtobool(++opt, &val))
674 prom_radix_disable = false;
676 prom_radix_disable = val;
678 prom_radix_disable = true;
680 if (prom_radix_disable)
681 prom_debug("Radix disabled from cmdline\n");
684 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
686 * The architecture vector has an array of PVR mask/value pairs,
687 * followed by # option vectors - 1, followed by the option vectors.
689 * See prom.h for the definition of the bits specified in the
690 * architecture vector.
693 /* Firmware expects the value to be n - 1, where n is the # of vectors */
694 #define NUM_VECTORS(n) ((n) - 1)
697 * Firmware expects 1 + n - 2, where n is the length of the option vector in
698 * bytes. The 1 accounts for the length byte itself, the - 2 .. ?
700 #define VECTOR_LENGTH(n) (1 + (n) - 2)
702 struct option_vector1 {
708 struct option_vector2 {
722 struct option_vector3 {
727 struct option_vector4 {
732 struct option_vector5 {
744 u8 platform_facilities;
755 struct option_vector6 {
761 struct ibm_arch_vec {
762 struct { u32 mask, val; } pvrs[12];
767 struct option_vector1 vec1;
770 struct option_vector2 vec2;
773 struct option_vector3 vec3;
776 struct option_vector4 vec4;
779 struct option_vector5 vec5;
782 struct option_vector6 vec6;
785 struct ibm_arch_vec __cacheline_aligned ibm_architecture_vec = {
788 .mask = cpu_to_be32(0xfffe0000), /* POWER5/POWER5+ */
789 .val = cpu_to_be32(0x003a0000),
792 .mask = cpu_to_be32(0xffff0000), /* POWER6 */
793 .val = cpu_to_be32(0x003e0000),
796 .mask = cpu_to_be32(0xffff0000), /* POWER7 */
797 .val = cpu_to_be32(0x003f0000),
800 .mask = cpu_to_be32(0xffff0000), /* POWER8E */
801 .val = cpu_to_be32(0x004b0000),
804 .mask = cpu_to_be32(0xffff0000), /* POWER8NVL */
805 .val = cpu_to_be32(0x004c0000),
808 .mask = cpu_to_be32(0xffff0000), /* POWER8 */
809 .val = cpu_to_be32(0x004d0000),
812 .mask = cpu_to_be32(0xffff0000), /* POWER9 */
813 .val = cpu_to_be32(0x004e0000),
816 .mask = cpu_to_be32(0xffffffff), /* all 3.00-compliant */
817 .val = cpu_to_be32(0x0f000005),
820 .mask = cpu_to_be32(0xffffffff), /* all 2.07-compliant */
821 .val = cpu_to_be32(0x0f000004),
824 .mask = cpu_to_be32(0xffffffff), /* all 2.06-compliant */
825 .val = cpu_to_be32(0x0f000003),
828 .mask = cpu_to_be32(0xffffffff), /* all 2.05-compliant */
829 .val = cpu_to_be32(0x0f000002),
832 .mask = cpu_to_be32(0xfffffffe), /* all 2.04-compliant and earlier */
833 .val = cpu_to_be32(0x0f000001),
837 .num_vectors = NUM_VECTORS(6),
839 .vec1_len = VECTOR_LENGTH(sizeof(struct option_vector1)),
842 .arch_versions = OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 |
843 OV1_PPC_2_04 | OV1_PPC_2_05 | OV1_PPC_2_06 | OV1_PPC_2_07,
844 .arch_versions3 = OV1_PPC_3_00,
847 .vec2_len = VECTOR_LENGTH(sizeof(struct option_vector2)),
848 /* option vector 2: Open Firmware options supported */
850 .byte1 = OV2_REAL_MODE,
852 .real_base = cpu_to_be32(0xffffffff),
853 .real_size = cpu_to_be32(0xffffffff),
854 .virt_base = cpu_to_be32(0xffffffff),
855 .virt_size = cpu_to_be32(0xffffffff),
856 .load_base = cpu_to_be32(0xffffffff),
857 .min_rma = cpu_to_be32(512), /* 512MB min RMA */
858 .min_load = cpu_to_be32(0xffffffff), /* full client load */
859 .min_rma_percent = 0, /* min RMA percentage of total RAM */
860 .max_pft_size = 48, /* max log_2(hash table size) */
863 .vec3_len = VECTOR_LENGTH(sizeof(struct option_vector3)),
864 /* option vector 3: processor options supported */
866 .byte1 = 0, /* don't ignore, don't halt */
867 .byte2 = OV3_FP | OV3_VMX | OV3_DFP,
870 .vec4_len = VECTOR_LENGTH(sizeof(struct option_vector4)),
871 /* option vector 4: IBM PAPR implementation */
873 .byte1 = 0, /* don't halt */
874 .min_vp_cap = OV4_MIN_ENT_CAP, /* minimum VP entitled capacity */
877 .vec5_len = VECTOR_LENGTH(sizeof(struct option_vector5)),
878 /* option vector 5: PAPR/OF options */
880 .byte1 = 0, /* don't ignore, don't halt */
881 .byte2 = OV5_FEAT(OV5_LPAR) | OV5_FEAT(OV5_SPLPAR) | OV5_FEAT(OV5_LARGE_PAGES) |
882 OV5_FEAT(OV5_DRCONF_MEMORY) | OV5_FEAT(OV5_DONATE_DEDICATE_CPU) |
883 #ifdef CONFIG_PCI_MSI
884 /* PCIe/MSI support. Without MSI full PCIe is not supported */
891 #ifdef CONFIG_PPC_SMLPAR
892 OV5_FEAT(OV5_CMO) | OV5_FEAT(OV5_XCMO),
896 .associativity = OV5_FEAT(OV5_TYPE1_AFFINITY) | OV5_FEAT(OV5_PRRN),
897 .bin_opts = OV5_FEAT(OV5_RESIZE_HPT) | OV5_FEAT(OV5_HP_EVT),
898 .micro_checkpoint = 0,
900 .max_cpus = cpu_to_be32(NR_CPUS), /* number of cores supported */
903 .platform_facilities = OV5_FEAT(OV5_PFO_HW_RNG) | OV5_FEAT(OV5_PFO_HW_ENCR) | OV5_FEAT(OV5_PFO_HW_842),
907 .byte22 = OV5_FEAT(OV5_DRMEM_V2) | OV5_FEAT(OV5_DRC_INFO),
914 /* option vector 6: IBM PAPR hints */
915 .vec6_len = VECTOR_LENGTH(sizeof(struct option_vector6)),
919 .os_name = OV6_LINUX,
923 /* Old method - ELF header with PT_NOTE sections only works on BE */
924 #ifdef __BIG_ENDIAN__
925 static struct fake_elf {
932 char name[8]; /* "PowerPC" */
946 char name[24]; /* "IBM,RPA-Client-Config" */
960 .e_ident = { 0x7f, 'E', 'L', 'F',
961 ELFCLASS32, ELFDATA2MSB, EV_CURRENT },
962 .e_type = ET_EXEC, /* yeah right */
964 .e_version = EV_CURRENT,
965 .e_phoff = offsetof(struct fake_elf, phdr),
966 .e_phentsize = sizeof(Elf32_Phdr),
972 .p_offset = offsetof(struct fake_elf, chrpnote),
973 .p_filesz = sizeof(struct chrpnote)
976 .p_offset = offsetof(struct fake_elf, rpanote),
977 .p_filesz = sizeof(struct rpanote)
981 .namesz = sizeof("PowerPC"),
982 .descsz = sizeof(struct chrpdesc),
986 .real_mode = ~0U, /* ~0 means "don't care" */
995 .namesz = sizeof("IBM,RPA-Client-Config"),
996 .descsz = sizeof(struct rpadesc),
998 .name = "IBM,RPA-Client-Config",
1001 .min_rmo_size = 64, /* in megabytes */
1002 .min_rmo_percent = 0,
1003 .max_pft_size = 48, /* 2^48 bytes max PFT size */
1010 #endif /* __BIG_ENDIAN__ */
1012 static int __init prom_count_smt_threads(void)
1018 /* Pick up th first CPU node we can find */
1019 for (node = 0; prom_next_node(&node); ) {
1021 prom_getprop(node, "device_type", type, sizeof(type));
1023 if (strcmp(type, "cpu"))
1026 * There is an entry for each smt thread, each entry being
1027 * 4 bytes long. All cpus should have the same number of
1028 * smt threads, so return after finding the first.
1030 plen = prom_getproplen(node, "ibm,ppc-interrupt-server#s");
1031 if (plen == PROM_ERROR)
1034 prom_debug("Found %lu smt threads per core\n", (unsigned long)plen);
1037 if (plen < 1 || plen > 64) {
1038 prom_printf("Threads per core %lu out of bounds, assuming 1\n",
1039 (unsigned long)plen);
1044 prom_debug("No threads found, assuming 1 per core\n");
1050 static void __init prom_parse_mmu_model(u8 val,
1051 struct platform_support *support)
1054 case OV5_FEAT(OV5_MMU_DYNAMIC):
1055 case OV5_FEAT(OV5_MMU_EITHER): /* Either Available */
1056 prom_debug("MMU - either supported\n");
1057 support->radix_mmu = !prom_radix_disable;
1058 support->hash_mmu = true;
1060 case OV5_FEAT(OV5_MMU_RADIX): /* Only Radix */
1061 prom_debug("MMU - radix only\n");
1062 if (prom_radix_disable) {
1064 * If we __have__ to do radix, we're better off ignoring
1065 * the command line rather than not booting.
1067 prom_printf("WARNING: Ignoring cmdline option disable_radix\n");
1069 support->radix_mmu = true;
1071 case OV5_FEAT(OV5_MMU_HASH):
1072 prom_debug("MMU - hash only\n");
1073 support->hash_mmu = true;
1076 prom_debug("Unknown mmu support option: 0x%x\n", val);
1081 static void __init prom_parse_xive_model(u8 val,
1082 struct platform_support *support)
1085 case OV5_FEAT(OV5_XIVE_EITHER): /* Either Available */
1086 prom_debug("XIVE - either mode supported\n");
1087 support->xive = true;
1089 case OV5_FEAT(OV5_XIVE_EXPLOIT): /* Only Exploitation mode */
1090 prom_debug("XIVE - exploitation mode supported\n");
1091 support->xive = true;
1093 case OV5_FEAT(OV5_XIVE_LEGACY): /* Only Legacy mode */
1094 prom_debug("XIVE - legacy mode supported\n");
1097 prom_debug("Unknown xive support option: 0x%x\n", val);
1102 static void __init prom_parse_platform_support(u8 index, u8 val,
1103 struct platform_support *support)
1106 case OV5_INDX(OV5_MMU_SUPPORT): /* MMU Model */
1107 prom_parse_mmu_model(val & OV5_FEAT(OV5_MMU_SUPPORT), support);
1109 case OV5_INDX(OV5_RADIX_GTSE): /* Radix Extensions */
1110 if (val & OV5_FEAT(OV5_RADIX_GTSE)) {
1111 prom_debug("Radix - GTSE supported\n");
1112 support->radix_gtse = true;
1115 case OV5_INDX(OV5_XIVE_SUPPORT): /* Interrupt mode */
1116 prom_parse_xive_model(val & OV5_FEAT(OV5_XIVE_SUPPORT),
1122 static void __init prom_check_platform_support(void)
1124 struct platform_support supported = {
1127 .radix_gtse = false,
1130 int prop_len = prom_getproplen(prom.chosen,
1131 "ibm,arch-vec-5-platform-support");
1135 prom_debug("Found ibm,arch-vec-5-platform-support, len: %d\n",
1137 prom_getprop(prom.chosen, "ibm,arch-vec-5-platform-support",
1139 for (i = 0; i < prop_len; i += 2) {
1140 prom_debug("%d: index = 0x%x val = 0x%x\n", i / 2
1143 prom_parse_platform_support(vec[i], vec[i + 1],
1148 if (supported.radix_mmu && supported.radix_gtse &&
1149 IS_ENABLED(CONFIG_PPC_RADIX_MMU)) {
1150 /* Radix preferred - but we require GTSE for now */
1151 prom_debug("Asking for radix with GTSE\n");
1152 ibm_architecture_vec.vec5.mmu = OV5_FEAT(OV5_MMU_RADIX);
1153 ibm_architecture_vec.vec5.radix_ext = OV5_FEAT(OV5_RADIX_GTSE);
1154 } else if (supported.hash_mmu) {
1155 /* Default to hash mmu (if we can) */
1156 prom_debug("Asking for hash\n");
1157 ibm_architecture_vec.vec5.mmu = OV5_FEAT(OV5_MMU_HASH);
1159 /* We're probably on a legacy hypervisor */
1160 prom_debug("Assuming legacy hash support\n");
1163 if (supported.xive) {
1164 prom_debug("Asking for XIVE\n");
1165 ibm_architecture_vec.vec5.intarch = OV5_FEAT(OV5_XIVE_EXPLOIT);
1169 static void __init prom_send_capabilities(void)
1175 /* Check ibm,arch-vec-5-platform-support and fixup vec5 if required */
1176 prom_check_platform_support();
1178 root = call_prom("open", 1, 1, ADDR("/"));
1180 /* We need to tell the FW about the number of cores we support.
1182 * To do that, we count the number of threads on the first core
1183 * (we assume this is the same for all cores) and use it to
1187 cores = DIV_ROUND_UP(NR_CPUS, prom_count_smt_threads());
1188 prom_printf("Max number of cores passed to firmware: %u (NR_CPUS = %d)\n",
1191 ibm_architecture_vec.vec5.max_cpus = cpu_to_be32(cores);
1193 /* try calling the ibm,client-architecture-support method */
1194 prom_printf("Calling ibm,client-architecture-support...");
1195 if (call_prom_ret("call-method", 3, 2, &ret,
1196 ADDR("ibm,client-architecture-support"),
1198 ADDR(&ibm_architecture_vec)) == 0) {
1199 /* the call exists... */
1201 prom_printf("\nWARNING: ibm,client-architecture"
1202 "-support call FAILED!\n");
1203 call_prom("close", 1, 0, root);
1204 prom_printf(" done\n");
1207 call_prom("close", 1, 0, root);
1208 prom_printf(" not implemented\n");
1211 #ifdef __BIG_ENDIAN__
1215 /* no ibm,client-architecture-support call, try the old way */
1216 elfloader = call_prom("open", 1, 1,
1217 ADDR("/packages/elf-loader"));
1218 if (elfloader == 0) {
1219 prom_printf("couldn't open /packages/elf-loader\n");
1222 call_prom("call-method", 3, 1, ADDR("process-elf-header"),
1223 elfloader, ADDR(&fake_elf));
1224 call_prom("close", 1, 0, elfloader);
1226 #endif /* __BIG_ENDIAN__ */
1228 #endif /* #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) */
1231 * Memory allocation strategy... our layout is normally:
1233 * at 14Mb or more we have vmlinux, then a gap and initrd. In some
1234 * rare cases, initrd might end up being before the kernel though.
1235 * We assume this won't override the final kernel at 0, we have no
1236 * provision to handle that in this version, but it should hopefully
1239 * alloc_top is set to the top of RMO, eventually shrink down if the
1242 * alloc_bottom is set to the top of kernel/initrd
1244 * from there, allocations are done this way : rtas is allocated
1245 * topmost, and the device-tree is allocated from the bottom. We try
1246 * to grow the device-tree allocation as we progress. If we can't,
1247 * then we fail, we don't currently have a facility to restart
1248 * elsewhere, but that shouldn't be necessary.
1250 * Note that calls to reserve_mem have to be done explicitly, memory
1251 * allocated with either alloc_up or alloc_down isn't automatically
1257 * Allocates memory in the RMO upward from the kernel/initrd
1259 * When align is 0, this is a special case, it means to allocate in place
1260 * at the current location of alloc_bottom or fail (that is basically
1261 * extending the previous allocation). Used for the device-tree flattening
1263 static unsigned long __init alloc_up(unsigned long size, unsigned long align)
1265 unsigned long base = alloc_bottom;
1266 unsigned long addr = 0;
1269 base = _ALIGN_UP(base, align);
1270 prom_debug("%s(%lx, %lx)\n", __func__, size, align);
1272 prom_panic("alloc_up() called with mem not initialized\n");
1275 base = _ALIGN_UP(alloc_bottom, align);
1277 base = alloc_bottom;
1279 for(; (base + size) <= alloc_top;
1280 base = _ALIGN_UP(base + 0x100000, align)) {
1281 prom_debug(" trying: 0x%lx\n\r", base);
1282 addr = (unsigned long)prom_claim(base, size, 0);
1283 if (addr != PROM_ERROR && addr != 0)
1291 alloc_bottom = addr + size;
1293 prom_debug(" -> %lx\n", addr);
1294 prom_debug(" alloc_bottom : %lx\n", alloc_bottom);
1295 prom_debug(" alloc_top : %lx\n", alloc_top);
1296 prom_debug(" alloc_top_hi : %lx\n", alloc_top_high);
1297 prom_debug(" rmo_top : %lx\n", rmo_top);
1298 prom_debug(" ram_top : %lx\n", ram_top);
1304 * Allocates memory downward, either from top of RMO, or if highmem
1305 * is set, from the top of RAM. Note that this one doesn't handle
1306 * failures. It does claim memory if highmem is not set.
1308 static unsigned long __init alloc_down(unsigned long size, unsigned long align,
1311 unsigned long base, addr = 0;
1313 prom_debug("%s(%lx, %lx, %s)\n", __func__, size, align,
1314 highmem ? "(high)" : "(low)");
1316 prom_panic("alloc_down() called with mem not initialized\n");
1319 /* Carve out storage for the TCE table. */
1320 addr = _ALIGN_DOWN(alloc_top_high - size, align);
1321 if (addr <= alloc_bottom)
1323 /* Will we bump into the RMO ? If yes, check out that we
1324 * didn't overlap existing allocations there, if we did,
1325 * we are dead, we must be the first in town !
1327 if (addr < rmo_top) {
1328 /* Good, we are first */
1329 if (alloc_top == rmo_top)
1330 alloc_top = rmo_top = addr;
1334 alloc_top_high = addr;
1338 base = _ALIGN_DOWN(alloc_top - size, align);
1339 for (; base > alloc_bottom;
1340 base = _ALIGN_DOWN(base - 0x100000, align)) {
1341 prom_debug(" trying: 0x%lx\n\r", base);
1342 addr = (unsigned long)prom_claim(base, size, 0);
1343 if (addr != PROM_ERROR && addr != 0)
1352 prom_debug(" -> %lx\n", addr);
1353 prom_debug(" alloc_bottom : %lx\n", alloc_bottom);
1354 prom_debug(" alloc_top : %lx\n", alloc_top);
1355 prom_debug(" alloc_top_hi : %lx\n", alloc_top_high);
1356 prom_debug(" rmo_top : %lx\n", rmo_top);
1357 prom_debug(" ram_top : %lx\n", ram_top);
1363 * Parse a "reg" cell
1365 static unsigned long __init prom_next_cell(int s, cell_t **cellp)
1368 unsigned long r = 0;
1370 /* Ignore more than 2 cells */
1371 while (s > sizeof(unsigned long) / 4) {
1375 r = be32_to_cpu(*p++);
1379 r |= be32_to_cpu(*(p++));
1387 * Very dumb function for adding to the memory reserve list, but
1388 * we don't need anything smarter at this point
1390 * XXX Eventually check for collisions. They should NEVER happen.
1391 * If problems seem to show up, it would be a good start to track
1394 static void __init reserve_mem(u64 base, u64 size)
1396 u64 top = base + size;
1397 unsigned long cnt = mem_reserve_cnt;
1402 /* We need to always keep one empty entry so that we
1403 * have our terminator with "size" set to 0 since we are
1404 * dumb and just copy this entire array to the boot params
1406 base = _ALIGN_DOWN(base, PAGE_SIZE);
1407 top = _ALIGN_UP(top, PAGE_SIZE);
1410 if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))
1411 prom_panic("Memory reserve map exhausted !\n");
1412 mem_reserve_map[cnt].base = cpu_to_be64(base);
1413 mem_reserve_map[cnt].size = cpu_to_be64(size);
1414 mem_reserve_cnt = cnt + 1;
1418 * Initialize memory allocation mechanism, parse "memory" nodes and
1419 * obtain that way the top of memory and RMO to setup out local allocator
1421 static void __init prom_init_mem(void)
1434 * We iterate the memory nodes to find
1435 * 1) top of RMO (first node)
1438 val = cpu_to_be32(2);
1439 prom_getprop(prom.root, "#address-cells", &val, sizeof(val));
1440 rac = be32_to_cpu(val);
1441 val = cpu_to_be32(1);
1442 prom_getprop(prom.root, "#size-cells", &val, sizeof(rsc));
1443 rsc = be32_to_cpu(val);
1444 prom_debug("root_addr_cells: %x\n", rac);
1445 prom_debug("root_size_cells: %x\n", rsc);
1447 prom_debug("scanning memory:\n");
1449 path = prom_scratch;
1452 for (node = 0; prom_next_node(&node); ) {
1454 prom_getprop(node, "device_type", type, sizeof(type));
1458 * CHRP Longtrail machines have no device_type
1459 * on the memory node, so check the name instead...
1461 prom_getprop(node, "name", type, sizeof(type));
1463 if (strcmp(type, "memory"))
1466 plen = prom_getprop(node, "reg", regbuf, sizeof(regbuf));
1467 if (plen > sizeof(regbuf)) {
1468 prom_printf("memory node too large for buffer !\n");
1469 plen = sizeof(regbuf);
1472 endp = p + (plen / sizeof(cell_t));
1475 memset(path, 0, PROM_SCRATCH_SIZE);
1476 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
1477 prom_debug(" node %s :\n", path);
1478 #endif /* DEBUG_PROM */
1480 while ((endp - p) >= (rac + rsc)) {
1481 unsigned long base, size;
1483 base = prom_next_cell(rac, &p);
1484 size = prom_next_cell(rsc, &p);
1488 prom_debug(" %lx %lx\n", base, size);
1489 if (base == 0 && (of_platform & PLATFORM_LPAR))
1491 if ((base + size) > ram_top)
1492 ram_top = base + size;
1496 alloc_bottom = PAGE_ALIGN((unsigned long)&_end + 0x4000);
1499 * If prom_memory_limit is set we reduce the upper limits *except* for
1500 * alloc_top_high. This must be the real top of RAM so we can put
1504 alloc_top_high = ram_top;
1506 if (prom_memory_limit) {
1507 if (prom_memory_limit <= alloc_bottom) {
1508 prom_printf("Ignoring mem=%lx <= alloc_bottom.\n",
1510 prom_memory_limit = 0;
1511 } else if (prom_memory_limit >= ram_top) {
1512 prom_printf("Ignoring mem=%lx >= ram_top.\n",
1514 prom_memory_limit = 0;
1516 ram_top = prom_memory_limit;
1517 rmo_top = min(rmo_top, prom_memory_limit);
1522 * Setup our top alloc point, that is top of RMO or top of
1523 * segment 0 when running non-LPAR.
1524 * Some RS64 machines have buggy firmware where claims up at
1525 * 1GB fail. Cap at 768MB as a workaround.
1526 * Since 768MB is plenty of room, and we need to cap to something
1527 * reasonable on 32-bit, cap at 768MB on all machines.
1531 rmo_top = min(0x30000000ul, rmo_top);
1532 alloc_top = rmo_top;
1533 alloc_top_high = ram_top;
1536 * Check if we have an initrd after the kernel but still inside
1537 * the RMO. If we do move our bottom point to after it.
1539 if (prom_initrd_start &&
1540 prom_initrd_start < rmo_top &&
1541 prom_initrd_end > alloc_bottom)
1542 alloc_bottom = PAGE_ALIGN(prom_initrd_end);
1544 prom_printf("memory layout at init:\n");
1545 prom_printf(" memory_limit : %lx (16 MB aligned)\n",
1547 prom_printf(" alloc_bottom : %lx\n", alloc_bottom);
1548 prom_printf(" alloc_top : %lx\n", alloc_top);
1549 prom_printf(" alloc_top_hi : %lx\n", alloc_top_high);
1550 prom_printf(" rmo_top : %lx\n", rmo_top);
1551 prom_printf(" ram_top : %lx\n", ram_top);
1554 static void __init prom_close_stdin(void)
1559 if (prom_getprop(prom.chosen, "stdin", &val, sizeof(val)) > 0) {
1560 stdin = be32_to_cpu(val);
1561 call_prom("close", 1, 0, stdin);
1565 #ifdef CONFIG_PPC_POWERNV
1567 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
1568 static u64 __initdata prom_opal_base;
1569 static u64 __initdata prom_opal_entry;
1573 * Allocate room for and instantiate OPAL
1575 static void __init prom_instantiate_opal(void)
1580 u64 size = 0, align = 0x10000;
1584 prom_debug("prom_instantiate_opal: start...\n");
1586 opal_node = call_prom("finddevice", 1, 1, ADDR("/ibm,opal"));
1587 prom_debug("opal_node: %x\n", opal_node);
1588 if (!PHANDLE_VALID(opal_node))
1592 prom_getprop(opal_node, "opal-runtime-size", &val64, sizeof(val64));
1593 size = be64_to_cpu(val64);
1597 prom_getprop(opal_node, "opal-runtime-alignment", &val64,sizeof(val64));
1598 align = be64_to_cpu(val64);
1600 base = alloc_down(size, align, 0);
1602 prom_printf("OPAL allocation failed !\n");
1606 opal_inst = call_prom("open", 1, 1, ADDR("/ibm,opal"));
1607 if (!IHANDLE_VALID(opal_inst)) {
1608 prom_printf("opening opal package failed (%x)\n", opal_inst);
1612 prom_printf("instantiating opal at 0x%llx...", base);
1614 if (call_prom_ret("call-method", 4, 3, rets,
1615 ADDR("load-opal-runtime"),
1617 base >> 32, base & 0xffffffff) != 0
1618 || (rets[0] == 0 && rets[1] == 0)) {
1619 prom_printf(" failed\n");
1622 entry = (((u64)rets[0]) << 32) | rets[1];
1624 prom_printf(" done\n");
1626 reserve_mem(base, size);
1628 prom_debug("opal base = 0x%llx\n", base);
1629 prom_debug("opal align = 0x%llx\n", align);
1630 prom_debug("opal entry = 0x%llx\n", entry);
1631 prom_debug("opal size = 0x%llx\n", size);
1633 prom_setprop(opal_node, "/ibm,opal", "opal-base-address",
1634 &base, sizeof(base));
1635 prom_setprop(opal_node, "/ibm,opal", "opal-entry-address",
1636 &entry, sizeof(entry));
1638 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
1639 prom_opal_base = base;
1640 prom_opal_entry = entry;
1642 prom_debug("prom_instantiate_opal: end...\n");
1645 #endif /* CONFIG_PPC_POWERNV */
1648 * Allocate room for and instantiate RTAS
1650 static void __init prom_instantiate_rtas(void)
1654 u32 base, entry = 0;
1658 prom_debug("prom_instantiate_rtas: start...\n");
1660 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1661 prom_debug("rtas_node: %x\n", rtas_node);
1662 if (!PHANDLE_VALID(rtas_node))
1666 prom_getprop(rtas_node, "rtas-size", &val, sizeof(size));
1667 size = be32_to_cpu(val);
1671 base = alloc_down(size, PAGE_SIZE, 0);
1673 prom_panic("Could not allocate memory for RTAS\n");
1675 rtas_inst = call_prom("open", 1, 1, ADDR("/rtas"));
1676 if (!IHANDLE_VALID(rtas_inst)) {
1677 prom_printf("opening rtas package failed (%x)\n", rtas_inst);
1681 prom_printf("instantiating rtas at 0x%x...", base);
1683 if (call_prom_ret("call-method", 3, 2, &entry,
1684 ADDR("instantiate-rtas"),
1685 rtas_inst, base) != 0
1687 prom_printf(" failed\n");
1690 prom_printf(" done\n");
1692 reserve_mem(base, size);
1694 val = cpu_to_be32(base);
1695 prom_setprop(rtas_node, "/rtas", "linux,rtas-base",
1697 val = cpu_to_be32(entry);
1698 prom_setprop(rtas_node, "/rtas", "linux,rtas-entry",
1701 /* Check if it supports "query-cpu-stopped-state" */
1702 if (prom_getprop(rtas_node, "query-cpu-stopped-state",
1703 &val, sizeof(val)) != PROM_ERROR)
1704 rtas_has_query_cpu_stopped = true;
1706 prom_debug("rtas base = 0x%x\n", base);
1707 prom_debug("rtas entry = 0x%x\n", entry);
1708 prom_debug("rtas size = 0x%x\n", size);
1710 prom_debug("prom_instantiate_rtas: end...\n");
1715 * Allocate room for and instantiate Stored Measurement Log (SML)
1717 static void __init prom_instantiate_sml(void)
1719 phandle ibmvtpm_node;
1720 ihandle ibmvtpm_inst;
1721 u32 entry = 0, size = 0, succ = 0;
1725 prom_debug("prom_instantiate_sml: start...\n");
1727 ibmvtpm_node = call_prom("finddevice", 1, 1, ADDR("/vdevice/vtpm"));
1728 prom_debug("ibmvtpm_node: %x\n", ibmvtpm_node);
1729 if (!PHANDLE_VALID(ibmvtpm_node))
1732 ibmvtpm_inst = call_prom("open", 1, 1, ADDR("/vdevice/vtpm"));
1733 if (!IHANDLE_VALID(ibmvtpm_inst)) {
1734 prom_printf("opening vtpm package failed (%x)\n", ibmvtpm_inst);
1738 if (prom_getprop(ibmvtpm_node, "ibm,sml-efi-reformat-supported",
1739 &val, sizeof(val)) != PROM_ERROR) {
1740 if (call_prom_ret("call-method", 2, 2, &succ,
1741 ADDR("reformat-sml-to-efi-alignment"),
1742 ibmvtpm_inst) != 0 || succ == 0) {
1743 prom_printf("Reformat SML to EFI alignment failed\n");
1747 if (call_prom_ret("call-method", 2, 2, &size,
1748 ADDR("sml-get-allocated-size"),
1749 ibmvtpm_inst) != 0 || size == 0) {
1750 prom_printf("SML get allocated size failed\n");
1754 if (call_prom_ret("call-method", 2, 2, &size,
1755 ADDR("sml-get-handover-size"),
1756 ibmvtpm_inst) != 0 || size == 0) {
1757 prom_printf("SML get handover size failed\n");
1762 base = alloc_down(size, PAGE_SIZE, 0);
1764 prom_panic("Could not allocate memory for sml\n");
1766 prom_printf("instantiating sml at 0x%llx...", base);
1768 memset((void *)base, 0, size);
1770 if (call_prom_ret("call-method", 4, 2, &entry,
1771 ADDR("sml-handover"),
1772 ibmvtpm_inst, size, base) != 0 || entry == 0) {
1773 prom_printf("SML handover failed\n");
1776 prom_printf(" done\n");
1778 reserve_mem(base, size);
1780 prom_setprop(ibmvtpm_node, "/vdevice/vtpm", "linux,sml-base",
1781 &base, sizeof(base));
1782 prom_setprop(ibmvtpm_node, "/vdevice/vtpm", "linux,sml-size",
1783 &size, sizeof(size));
1785 prom_debug("sml base = 0x%llx\n", base);
1786 prom_debug("sml size = 0x%x\n", size);
1788 prom_debug("prom_instantiate_sml: end...\n");
1792 * Allocate room for and initialize TCE tables
1794 #ifdef __BIG_ENDIAN__
1795 static void __init prom_initialize_tce_table(void)
1799 char compatible[64], type[64], model[64];
1800 char *path = prom_scratch;
1802 u32 minalign, minsize;
1803 u64 tce_entry, *tce_entryp;
1804 u64 local_alloc_top, local_alloc_bottom;
1810 prom_debug("starting prom_initialize_tce_table\n");
1812 /* Cache current top of allocs so we reserve a single block */
1813 local_alloc_top = alloc_top_high;
1814 local_alloc_bottom = local_alloc_top;
1816 /* Search all nodes looking for PHBs. */
1817 for (node = 0; prom_next_node(&node); ) {
1821 prom_getprop(node, "compatible",
1822 compatible, sizeof(compatible));
1823 prom_getprop(node, "device_type", type, sizeof(type));
1824 prom_getprop(node, "model", model, sizeof(model));
1826 if ((type[0] == 0) || (strstr(type, "pci") == NULL))
1829 /* Keep the old logic intact to avoid regression. */
1830 if (compatible[0] != 0) {
1831 if ((strstr(compatible, "python") == NULL) &&
1832 (strstr(compatible, "Speedwagon") == NULL) &&
1833 (strstr(compatible, "Winnipeg") == NULL))
1835 } else if (model[0] != 0) {
1836 if ((strstr(model, "ython") == NULL) &&
1837 (strstr(model, "peedwagon") == NULL) &&
1838 (strstr(model, "innipeg") == NULL))
1842 if (prom_getprop(node, "tce-table-minalign", &minalign,
1843 sizeof(minalign)) == PROM_ERROR)
1845 if (prom_getprop(node, "tce-table-minsize", &minsize,
1846 sizeof(minsize)) == PROM_ERROR)
1847 minsize = 4UL << 20;
1850 * Even though we read what OF wants, we just set the table
1851 * size to 4 MB. This is enough to map 2GB of PCI DMA space.
1852 * By doing this, we avoid the pitfalls of trying to DMA to
1853 * MMIO space and the DMA alias hole.
1855 minsize = 4UL << 20;
1857 /* Align to the greater of the align or size */
1858 align = max(minalign, minsize);
1859 base = alloc_down(minsize, align, 1);
1861 prom_panic("ERROR, cannot find space for TCE table.\n");
1862 if (base < local_alloc_bottom)
1863 local_alloc_bottom = base;
1865 /* It seems OF doesn't null-terminate the path :-( */
1866 memset(path, 0, PROM_SCRATCH_SIZE);
1867 /* Call OF to setup the TCE hardware */
1868 if (call_prom("package-to-path", 3, 1, node,
1869 path, PROM_SCRATCH_SIZE-1) == PROM_ERROR) {
1870 prom_printf("package-to-path failed\n");
1873 /* Save away the TCE table attributes for later use. */
1874 prom_setprop(node, path, "linux,tce-base", &base, sizeof(base));
1875 prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize));
1877 prom_debug("TCE table: %s\n", path);
1878 prom_debug("\tnode = 0x%x\n", node);
1879 prom_debug("\tbase = 0x%llx\n", base);
1880 prom_debug("\tsize = 0x%x\n", minsize);
1882 /* Initialize the table to have a one-to-one mapping
1883 * over the allocated size.
1885 tce_entryp = (u64 *)base;
1886 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) {
1887 tce_entry = (i << PAGE_SHIFT);
1889 *tce_entryp = tce_entry;
1892 prom_printf("opening PHB %s", path);
1893 phb_node = call_prom("open", 1, 1, path);
1895 prom_printf("... failed\n");
1897 prom_printf("... done\n");
1899 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
1900 phb_node, -1, minsize,
1901 (u32) base, (u32) (base >> 32));
1902 call_prom("close", 1, 0, phb_node);
1905 reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);
1907 /* These are only really needed if there is a memory limit in
1908 * effect, but we don't know so export them always. */
1909 prom_tce_alloc_start = local_alloc_bottom;
1910 prom_tce_alloc_end = local_alloc_top;
1912 /* Flag the first invalid entry */
1913 prom_debug("ending prom_initialize_tce_table\n");
1915 #endif /* __BIG_ENDIAN__ */
1916 #endif /* CONFIG_PPC64 */
1919 * With CHRP SMP we need to use the OF to start the other processors.
1920 * We can't wait until smp_boot_cpus (the OF is trashed by then)
1921 * so we have to put the processors into a holding pattern controlled
1922 * by the kernel (not OF) before we destroy the OF.
1924 * This uses a chunk of low memory, puts some holding pattern
1925 * code there and sends the other processors off to there until
1926 * smp_boot_cpus tells them to do something. The holding pattern
1927 * checks that address until its cpu # is there, when it is that
1928 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care
1929 * of setting those values.
1931 * We also use physical address 0x4 here to tell when a cpu
1932 * is in its holding pattern code.
1937 * We want to reference the copy of __secondary_hold_* in the
1938 * 0 - 0x100 address range
1940 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff)
1942 static void __init prom_hold_cpus(void)
1947 unsigned long *spinloop
1948 = (void *) LOW_ADDR(__secondary_hold_spinloop);
1949 unsigned long *acknowledge
1950 = (void *) LOW_ADDR(__secondary_hold_acknowledge);
1951 unsigned long secondary_hold = LOW_ADDR(__secondary_hold);
1954 * On pseries, if RTAS supports "query-cpu-stopped-state",
1955 * we skip this stage, the CPUs will be started by the
1956 * kernel using RTAS.
1958 if ((of_platform == PLATFORM_PSERIES ||
1959 of_platform == PLATFORM_PSERIES_LPAR) &&
1960 rtas_has_query_cpu_stopped) {
1961 prom_printf("prom_hold_cpus: skipped\n");
1965 prom_debug("prom_hold_cpus: start...\n");
1966 prom_debug(" 1) spinloop = 0x%lx\n", (unsigned long)spinloop);
1967 prom_debug(" 1) *spinloop = 0x%lx\n", *spinloop);
1968 prom_debug(" 1) acknowledge = 0x%lx\n",
1969 (unsigned long)acknowledge);
1970 prom_debug(" 1) *acknowledge = 0x%lx\n", *acknowledge);
1971 prom_debug(" 1) secondary_hold = 0x%lx\n", secondary_hold);
1973 /* Set the common spinloop variable, so all of the secondary cpus
1974 * will block when they are awakened from their OF spinloop.
1975 * This must occur for both SMP and non SMP kernels, since OF will
1976 * be trashed when we move the kernel.
1981 for (node = 0; prom_next_node(&node); ) {
1982 unsigned int cpu_no;
1986 prom_getprop(node, "device_type", type, sizeof(type));
1987 if (strcmp(type, "cpu") != 0)
1990 /* Skip non-configured cpus. */
1991 if (prom_getprop(node, "status", type, sizeof(type)) > 0)
1992 if (strcmp(type, "okay") != 0)
1995 reg = cpu_to_be32(-1); /* make sparse happy */
1996 prom_getprop(node, "reg", ®, sizeof(reg));
1997 cpu_no = be32_to_cpu(reg);
1999 prom_debug("cpu hw idx = %u\n", cpu_no);
2001 /* Init the acknowledge var which will be reset by
2002 * the secondary cpu when it awakens from its OF
2005 *acknowledge = (unsigned long)-1;
2007 if (cpu_no != prom.cpu) {
2008 /* Primary Thread of non-boot cpu or any thread */
2009 prom_printf("starting cpu hw idx %u... ", cpu_no);
2010 call_prom("start-cpu", 3, 0, node,
2011 secondary_hold, cpu_no);
2013 for (i = 0; (i < 100000000) &&
2014 (*acknowledge == ((unsigned long)-1)); i++ )
2017 if (*acknowledge == cpu_no)
2018 prom_printf("done\n");
2020 prom_printf("failed: %lx\n", *acknowledge);
2024 prom_printf("boot cpu hw idx %u\n", cpu_no);
2025 #endif /* CONFIG_SMP */
2028 prom_debug("prom_hold_cpus: end...\n");
2032 static void __init prom_init_client_services(unsigned long pp)
2034 /* Get a handle to the prom entry point before anything else */
2037 /* get a handle for the stdout device */
2038 prom.chosen = call_prom("finddevice", 1, 1, ADDR("/chosen"));
2039 if (!PHANDLE_VALID(prom.chosen))
2040 prom_panic("cannot find chosen"); /* msg won't be printed :( */
2042 /* get device tree root */
2043 prom.root = call_prom("finddevice", 1, 1, ADDR("/"));
2044 if (!PHANDLE_VALID(prom.root))
2045 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
2052 * For really old powermacs, we need to map things we claim.
2053 * For that, we need the ihandle of the mmu.
2054 * Also, on the longtrail, we need to work around other bugs.
2056 static void __init prom_find_mmu(void)
2061 oprom = call_prom("finddevice", 1, 1, ADDR("/openprom"));
2062 if (!PHANDLE_VALID(oprom))
2064 if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0)
2066 version[sizeof(version) - 1] = 0;
2067 /* XXX might need to add other versions here */
2068 if (strcmp(version, "Open Firmware, 1.0.5") == 0)
2069 of_workarounds = OF_WA_CLAIM;
2070 else if (strncmp(version, "FirmWorks,3.", 12) == 0) {
2071 of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL;
2072 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
2075 prom.memory = call_prom("open", 1, 1, ADDR("/memory"));
2076 prom_getprop(prom.chosen, "mmu", &prom.mmumap,
2077 sizeof(prom.mmumap));
2078 prom.mmumap = be32_to_cpu(prom.mmumap);
2079 if (!IHANDLE_VALID(prom.memory) || !IHANDLE_VALID(prom.mmumap))
2080 of_workarounds &= ~OF_WA_CLAIM; /* hmmm */
2083 #define prom_find_mmu()
2086 static void __init prom_init_stdout(void)
2088 char *path = of_stdout_device;
2090 phandle stdout_node;
2093 if (prom_getprop(prom.chosen, "stdout", &val, sizeof(val)) <= 0)
2094 prom_panic("cannot find stdout");
2096 prom.stdout = be32_to_cpu(val);
2098 /* Get the full OF pathname of the stdout device */
2099 memset(path, 0, 256);
2100 call_prom("instance-to-path", 3, 1, prom.stdout, path, 255);
2101 prom_printf("OF stdout device is: %s\n", of_stdout_device);
2102 prom_setprop(prom.chosen, "/chosen", "linux,stdout-path",
2103 path, strlen(path) + 1);
2105 /* instance-to-package fails on PA-Semi */
2106 stdout_node = call_prom("instance-to-package", 1, 1, prom.stdout);
2107 if (stdout_node != PROM_ERROR) {
2108 val = cpu_to_be32(stdout_node);
2110 /* If it's a display, note it */
2111 memset(type, 0, sizeof(type));
2112 prom_getprop(stdout_node, "device_type", type, sizeof(type));
2113 if (strcmp(type, "display") == 0)
2114 prom_setprop(stdout_node, path, "linux,boot-display", NULL, 0);
2118 static int __init prom_find_machine_type(void)
2127 /* Look for a PowerMac or a Cell */
2128 len = prom_getprop(prom.root, "compatible",
2129 compat, sizeof(compat)-1);
2133 char *p = &compat[i];
2137 if (strstr(p, "Power Macintosh") ||
2138 strstr(p, "MacRISC"))
2139 return PLATFORM_POWERMAC;
2141 /* We must make sure we don't detect the IBM Cell
2142 * blades as pSeries due to some firmware issues,
2145 if (strstr(p, "IBM,CBEA") ||
2146 strstr(p, "IBM,CPBW-1.0"))
2147 return PLATFORM_GENERIC;
2148 #endif /* CONFIG_PPC64 */
2153 /* Try to detect OPAL */
2154 if (PHANDLE_VALID(call_prom("finddevice", 1, 1, ADDR("/ibm,opal"))))
2155 return PLATFORM_OPAL;
2157 /* Try to figure out if it's an IBM pSeries or any other
2158 * PAPR compliant platform. We assume it is if :
2159 * - /device_type is "chrp" (please, do NOT use that for future
2163 len = prom_getprop(prom.root, "device_type",
2164 compat, sizeof(compat)-1);
2166 return PLATFORM_GENERIC;
2167 if (strcmp(compat, "chrp"))
2168 return PLATFORM_GENERIC;
2170 /* Default to pSeries. We need to know if we are running LPAR */
2171 rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
2172 if (!PHANDLE_VALID(rtas))
2173 return PLATFORM_GENERIC;
2174 x = prom_getproplen(rtas, "ibm,hypertas-functions");
2175 if (x != PROM_ERROR) {
2176 prom_debug("Hypertas detected, assuming LPAR !\n");
2177 return PLATFORM_PSERIES_LPAR;
2179 return PLATFORM_PSERIES;
2181 return PLATFORM_GENERIC;
2185 static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
2187 return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);
2191 * If we have a display that we don't know how to drive,
2192 * we will want to try to execute OF's open method for it
2193 * later. However, OF will probably fall over if we do that
2194 * we've taken over the MMU.
2195 * So we check whether we will need to open the display,
2196 * and if so, open it now.
2198 static void __init prom_check_displays(void)
2200 char type[16], *path;
2205 static unsigned char default_colors[] = {
2223 const unsigned char *clut;
2225 prom_debug("Looking for displays\n");
2226 for (node = 0; prom_next_node(&node); ) {
2227 memset(type, 0, sizeof(type));
2228 prom_getprop(node, "device_type", type, sizeof(type));
2229 if (strcmp(type, "display") != 0)
2232 /* It seems OF doesn't null-terminate the path :-( */
2233 path = prom_scratch;
2234 memset(path, 0, PROM_SCRATCH_SIZE);
2237 * leave some room at the end of the path for appending extra
2240 if (call_prom("package-to-path", 3, 1, node, path,
2241 PROM_SCRATCH_SIZE-10) == PROM_ERROR)
2243 prom_printf("found display : %s, opening... ", path);
2245 ih = call_prom("open", 1, 1, path);
2247 prom_printf("failed\n");
2252 prom_printf("done\n");
2253 prom_setprop(node, path, "linux,opened", NULL, 0);
2255 /* Setup a usable color table when the appropriate
2256 * method is available. Should update this to set-colors */
2257 clut = default_colors;
2258 for (i = 0; i < 16; i++, clut += 3)
2259 if (prom_set_color(ih, i, clut[0], clut[1],
2263 #ifdef CONFIG_LOGO_LINUX_CLUT224
2264 clut = PTRRELOC(logo_linux_clut224.clut);
2265 for (i = 0; i < logo_linux_clut224.clutsize; i++, clut += 3)
2266 if (prom_set_color(ih, i + 32, clut[0], clut[1],
2269 #endif /* CONFIG_LOGO_LINUX_CLUT224 */
2271 #ifdef CONFIG_PPC_EARLY_DEBUG_BOOTX
2272 if (prom_getprop(node, "linux,boot-display", NULL, 0) !=
2274 u32 width, height, pitch, addr;
2276 prom_printf("Setting btext !\n");
2277 prom_getprop(node, "width", &width, 4);
2278 prom_getprop(node, "height", &height, 4);
2279 prom_getprop(node, "linebytes", &pitch, 4);
2280 prom_getprop(node, "address", &addr, 4);
2281 prom_printf("W=%d H=%d LB=%d addr=0x%x\n",
2282 width, height, pitch, addr);
2283 btext_setup_display(width, height, 8, pitch, addr);
2285 #endif /* CONFIG_PPC_EARLY_DEBUG_BOOTX */
2290 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */
2291 static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end,
2292 unsigned long needed, unsigned long align)
2296 *mem_start = _ALIGN(*mem_start, align);
2297 while ((*mem_start + needed) > *mem_end) {
2298 unsigned long room, chunk;
2300 prom_debug("Chunk exhausted, claiming more at %lx...\n",
2302 room = alloc_top - alloc_bottom;
2303 if (room > DEVTREE_CHUNK_SIZE)
2304 room = DEVTREE_CHUNK_SIZE;
2305 if (room < PAGE_SIZE)
2306 prom_panic("No memory for flatten_device_tree "
2308 chunk = alloc_up(room, 0);
2310 prom_panic("No memory for flatten_device_tree "
2311 "(claim failed)\n");
2312 *mem_end = chunk + room;
2315 ret = (void *)*mem_start;
2316 *mem_start += needed;
2321 #define dt_push_token(token, mem_start, mem_end) do { \
2322 void *room = make_room(mem_start, mem_end, 4, 4); \
2323 *(__be32 *)room = cpu_to_be32(token); \
2326 static unsigned long __init dt_find_string(char *str)
2330 s = os = (char *)dt_string_start;
2332 while (s < (char *)dt_string_end) {
2333 if (strcmp(s, str) == 0)
2341 * The Open Firmware 1275 specification states properties must be 31 bytes or
2342 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
2344 #define MAX_PROPERTY_NAME 64
2346 static void __init scan_dt_build_strings(phandle node,
2347 unsigned long *mem_start,
2348 unsigned long *mem_end)
2350 char *prev_name, *namep, *sstart;
2354 sstart = (char *)dt_string_start;
2356 /* get and store all property names */
2359 /* 64 is max len of name including nul. */
2360 namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1);
2361 if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) {
2362 /* No more nodes: unwind alloc */
2363 *mem_start = (unsigned long)namep;
2368 if (strcmp(namep, "name") == 0) {
2369 *mem_start = (unsigned long)namep;
2373 /* get/create string entry */
2374 soff = dt_find_string(namep);
2376 *mem_start = (unsigned long)namep;
2377 namep = sstart + soff;
2379 /* Trim off some if we can */
2380 *mem_start = (unsigned long)namep + strlen(namep) + 1;
2381 dt_string_end = *mem_start;
2386 /* do all our children */
2387 child = call_prom("child", 1, 1, node);
2388 while (child != 0) {
2389 scan_dt_build_strings(child, mem_start, mem_end);
2390 child = call_prom("peer", 1, 1, child);
2394 static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
2395 unsigned long *mem_end)
2398 char *namep, *prev_name, *sstart, *p, *ep, *lp, *path;
2400 unsigned char *valp;
2401 static char pname[MAX_PROPERTY_NAME];
2402 int l, room, has_phandle = 0;
2404 dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);
2406 /* get the node's full name */
2407 namep = (char *)*mem_start;
2408 room = *mem_end - *mem_start;
2411 l = call_prom("package-to-path", 3, 1, node, namep, room);
2413 /* Didn't fit? Get more room. */
2415 if (l >= *mem_end - *mem_start)
2416 namep = make_room(mem_start, mem_end, l+1, 1);
2417 call_prom("package-to-path", 3, 1, node, namep, l);
2421 /* Fixup an Apple bug where they have bogus \0 chars in the
2422 * middle of the path in some properties, and extract
2423 * the unit name (everything after the last '/').
2425 for (lp = p = namep, ep = namep + l; p < ep; p++) {
2432 *mem_start = _ALIGN((unsigned long)lp + 1, 4);
2435 /* get it again for debugging */
2436 path = prom_scratch;
2437 memset(path, 0, PROM_SCRATCH_SIZE);
2438 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
2440 /* get and store all properties */
2442 sstart = (char *)dt_string_start;
2444 if (call_prom("nextprop", 3, 1, node, prev_name,
2449 if (strcmp(pname, "name") == 0) {
2454 /* find string offset */
2455 soff = dt_find_string(pname);
2457 prom_printf("WARNING: Can't find string index for"
2458 " <%s>, node %s\n", pname, path);
2461 prev_name = sstart + soff;
2464 l = call_prom("getproplen", 2, 1, node, pname);
2467 if (l == PROM_ERROR)
2470 /* push property head */
2471 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2472 dt_push_token(l, mem_start, mem_end);
2473 dt_push_token(soff, mem_start, mem_end);
2475 /* push property content */
2476 valp = make_room(mem_start, mem_end, l, 4);
2477 call_prom("getprop", 4, 1, node, pname, valp, l);
2478 *mem_start = _ALIGN(*mem_start, 4);
2480 if (!strcmp(pname, "phandle"))
2484 /* Add a "linux,phandle" property if no "phandle" property already
2485 * existed (can happen with OPAL)
2488 soff = dt_find_string("linux,phandle");
2490 prom_printf("WARNING: Can't find string index for"
2491 " <linux-phandle> node %s\n", path);
2493 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2494 dt_push_token(4, mem_start, mem_end);
2495 dt_push_token(soff, mem_start, mem_end);
2496 valp = make_room(mem_start, mem_end, 4, 4);
2497 *(__be32 *)valp = cpu_to_be32(node);
2501 /* do all our children */
2502 child = call_prom("child", 1, 1, node);
2503 while (child != 0) {
2504 scan_dt_build_struct(child, mem_start, mem_end);
2505 child = call_prom("peer", 1, 1, child);
2508 dt_push_token(OF_DT_END_NODE, mem_start, mem_end);
2511 static void __init flatten_device_tree(void)
2514 unsigned long mem_start, mem_end, room;
2515 struct boot_param_header *hdr;
2520 * Check how much room we have between alloc top & bottom (+/- a
2521 * few pages), crop to 1MB, as this is our "chunk" size
2523 room = alloc_top - alloc_bottom - 0x4000;
2524 if (room > DEVTREE_CHUNK_SIZE)
2525 room = DEVTREE_CHUNK_SIZE;
2526 prom_debug("starting device tree allocs at %lx\n", alloc_bottom);
2528 /* Now try to claim that */
2529 mem_start = (unsigned long)alloc_up(room, PAGE_SIZE);
2531 prom_panic("Can't allocate initial device-tree chunk\n");
2532 mem_end = mem_start + room;
2534 /* Get root of tree */
2535 root = call_prom("peer", 1, 1, (phandle)0);
2536 if (root == (phandle)0)
2537 prom_panic ("couldn't get device tree root\n");
2539 /* Build header and make room for mem rsv map */
2540 mem_start = _ALIGN(mem_start, 4);
2541 hdr = make_room(&mem_start, &mem_end,
2542 sizeof(struct boot_param_header), 4);
2543 dt_header_start = (unsigned long)hdr;
2544 rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8);
2546 /* Start of strings */
2547 mem_start = PAGE_ALIGN(mem_start);
2548 dt_string_start = mem_start;
2549 mem_start += 4; /* hole */
2551 /* Add "linux,phandle" in there, we'll need it */
2552 namep = make_room(&mem_start, &mem_end, 16, 1);
2553 strcpy(namep, "linux,phandle");
2554 mem_start = (unsigned long)namep + strlen(namep) + 1;
2556 /* Build string array */
2557 prom_printf("Building dt strings...\n");
2558 scan_dt_build_strings(root, &mem_start, &mem_end);
2559 dt_string_end = mem_start;
2561 /* Build structure */
2562 mem_start = PAGE_ALIGN(mem_start);
2563 dt_struct_start = mem_start;
2564 prom_printf("Building dt structure...\n");
2565 scan_dt_build_struct(root, &mem_start, &mem_end);
2566 dt_push_token(OF_DT_END, &mem_start, &mem_end);
2567 dt_struct_end = PAGE_ALIGN(mem_start);
2570 hdr->boot_cpuid_phys = cpu_to_be32(prom.cpu);
2571 hdr->magic = cpu_to_be32(OF_DT_HEADER);
2572 hdr->totalsize = cpu_to_be32(dt_struct_end - dt_header_start);
2573 hdr->off_dt_struct = cpu_to_be32(dt_struct_start - dt_header_start);
2574 hdr->off_dt_strings = cpu_to_be32(dt_string_start - dt_header_start);
2575 hdr->dt_strings_size = cpu_to_be32(dt_string_end - dt_string_start);
2576 hdr->off_mem_rsvmap = cpu_to_be32(((unsigned long)rsvmap) - dt_header_start);
2577 hdr->version = cpu_to_be32(OF_DT_VERSION);
2578 /* Version 16 is not backward compatible */
2579 hdr->last_comp_version = cpu_to_be32(0x10);
2581 /* Copy the reserve map in */
2582 memcpy(rsvmap, mem_reserve_map, sizeof(mem_reserve_map));
2587 prom_printf("reserved memory map:\n");
2588 for (i = 0; i < mem_reserve_cnt; i++)
2589 prom_printf(" %llx - %llx\n",
2590 be64_to_cpu(mem_reserve_map[i].base),
2591 be64_to_cpu(mem_reserve_map[i].size));
2594 /* Bump mem_reserve_cnt to cause further reservations to fail
2595 * since it's too late.
2597 mem_reserve_cnt = MEM_RESERVE_MAP_SIZE;
2599 prom_printf("Device tree strings 0x%lx -> 0x%lx\n",
2600 dt_string_start, dt_string_end);
2601 prom_printf("Device tree struct 0x%lx -> 0x%lx\n",
2602 dt_struct_start, dt_struct_end);
2605 #ifdef CONFIG_PPC_MAPLE
2606 /* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property.
2607 * The values are bad, and it doesn't even have the right number of cells. */
2608 static void __init fixup_device_tree_maple(void)
2611 u32 rloc = 0x01002000; /* IO space; PCI device = 4 */
2615 name = "/ht@0/isa@4";
2616 isa = call_prom("finddevice", 1, 1, ADDR(name));
2617 if (!PHANDLE_VALID(isa)) {
2618 name = "/ht@0/isa@6";
2619 isa = call_prom("finddevice", 1, 1, ADDR(name));
2620 rloc = 0x01003000; /* IO space; PCI device = 6 */
2622 if (!PHANDLE_VALID(isa))
2625 if (prom_getproplen(isa, "ranges") != 12)
2627 if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges))
2631 if (isa_ranges[0] != 0x1 ||
2632 isa_ranges[1] != 0xf4000000 ||
2633 isa_ranges[2] != 0x00010000)
2636 prom_printf("Fixing up bogus ISA range on Maple/Apache...\n");
2638 isa_ranges[0] = 0x1;
2639 isa_ranges[1] = 0x0;
2640 isa_ranges[2] = rloc;
2641 isa_ranges[3] = 0x0;
2642 isa_ranges[4] = 0x0;
2643 isa_ranges[5] = 0x00010000;
2644 prom_setprop(isa, name, "ranges",
2645 isa_ranges, sizeof(isa_ranges));
2648 #define CPC925_MC_START 0xf8000000
2649 #define CPC925_MC_LENGTH 0x1000000
2650 /* The values for memory-controller don't have right number of cells */
2651 static void __init fixup_device_tree_maple_memory_controller(void)
2655 char *name = "/hostbridge@f8000000";
2658 mc = call_prom("finddevice", 1, 1, ADDR(name));
2659 if (!PHANDLE_VALID(mc))
2662 if (prom_getproplen(mc, "reg") != 8)
2665 prom_getprop(prom.root, "#address-cells", &ac, sizeof(ac));
2666 prom_getprop(prom.root, "#size-cells", &sc, sizeof(sc));
2667 if ((ac != 2) || (sc != 2))
2670 if (prom_getprop(mc, "reg", mc_reg, sizeof(mc_reg)) == PROM_ERROR)
2673 if (mc_reg[0] != CPC925_MC_START || mc_reg[1] != CPC925_MC_LENGTH)
2676 prom_printf("Fixing up bogus hostbridge on Maple...\n");
2679 mc_reg[1] = CPC925_MC_START;
2681 mc_reg[3] = CPC925_MC_LENGTH;
2682 prom_setprop(mc, name, "reg", mc_reg, sizeof(mc_reg));
2685 #define fixup_device_tree_maple()
2686 #define fixup_device_tree_maple_memory_controller()
2689 #ifdef CONFIG_PPC_CHRP
2691 * Pegasos and BriQ lacks the "ranges" property in the isa node
2692 * Pegasos needs decimal IRQ 14/15, not hexadecimal
2693 * Pegasos has the IDE configured in legacy mode, but advertised as native
2695 static void __init fixup_device_tree_chrp(void)
2699 u32 rloc = 0x01006000; /* IO space; PCI device = 12 */
2703 name = "/pci@80000000/isa@c";
2704 ph = call_prom("finddevice", 1, 1, ADDR(name));
2705 if (!PHANDLE_VALID(ph)) {
2706 name = "/pci@ff500000/isa@6";
2707 ph = call_prom("finddevice", 1, 1, ADDR(name));
2708 rloc = 0x01003000; /* IO space; PCI device = 6 */
2710 if (PHANDLE_VALID(ph)) {
2711 rc = prom_getproplen(ph, "ranges");
2712 if (rc == 0 || rc == PROM_ERROR) {
2713 prom_printf("Fixing up missing ISA range on Pegasos...\n");
2720 prop[5] = 0x00010000;
2721 prom_setprop(ph, name, "ranges", prop, sizeof(prop));
2725 name = "/pci@80000000/ide@C,1";
2726 ph = call_prom("finddevice", 1, 1, ADDR(name));
2727 if (PHANDLE_VALID(ph)) {
2728 prom_printf("Fixing up IDE interrupt on Pegasos...\n");
2731 prom_setprop(ph, name, "interrupts", prop, 2*sizeof(u32));
2732 prom_printf("Fixing up IDE class-code on Pegasos...\n");
2733 rc = prom_getprop(ph, "class-code", prop, sizeof(u32));
2734 if (rc == sizeof(u32)) {
2736 prom_setprop(ph, name, "class-code", prop, sizeof(u32));
2741 #define fixup_device_tree_chrp()
2744 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
2745 static void __init fixup_device_tree_pmac(void)
2747 phandle u3, i2c, mpic;
2752 /* Some G5s have a missing interrupt definition, fix it up here */
2753 u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
2754 if (!PHANDLE_VALID(u3))
2756 i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
2757 if (!PHANDLE_VALID(i2c))
2759 mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
2760 if (!PHANDLE_VALID(mpic))
2763 /* check if proper rev of u3 */
2764 if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev))
2767 if (u3_rev < 0x35 || u3_rev > 0x39)
2769 /* does it need fixup ? */
2770 if (prom_getproplen(i2c, "interrupts") > 0)
2773 prom_printf("fixing up bogus interrupts for u3 i2c...\n");
2775 /* interrupt on this revision of u3 is number 0 and level */
2778 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts",
2779 &interrupts, sizeof(interrupts));
2781 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
2782 &parent, sizeof(parent));
2785 #define fixup_device_tree_pmac()
2788 #ifdef CONFIG_PPC_EFIKA
2790 * The MPC5200 FEC driver requires an phy-handle property to tell it how
2791 * to talk to the phy. If the phy-handle property is missing, then this
2792 * function is called to add the appropriate nodes and link it to the
2795 static void __init fixup_device_tree_efika_add_phy(void)
2801 /* Check if /builtin/ethernet exists - bail if it doesn't */
2802 node = call_prom("finddevice", 1, 1, ADDR("/builtin/ethernet"));
2803 if (!PHANDLE_VALID(node))
2806 /* Check if the phy-handle property exists - bail if it does */
2807 rv = prom_getprop(node, "phy-handle", prop, sizeof(prop));
2812 * At this point the ethernet device doesn't have a phy described.
2813 * Now we need to add the missing phy node and linkage
2816 /* Check for an MDIO bus node - if missing then create one */
2817 node = call_prom("finddevice", 1, 1, ADDR("/builtin/mdio"));
2818 if (!PHANDLE_VALID(node)) {
2819 prom_printf("Adding Ethernet MDIO node\n");
2820 call_prom("interpret", 1, 1,
2821 " s\" /builtin\" find-device"
2823 " 1 encode-int s\" #address-cells\" property"
2824 " 0 encode-int s\" #size-cells\" property"
2825 " s\" mdio\" device-name"
2826 " s\" fsl,mpc5200b-mdio\" encode-string"
2827 " s\" compatible\" property"
2828 " 0xf0003000 0x400 reg"
2830 " 0x5 encode-int encode+"
2831 " 0x3 encode-int encode+"
2832 " s\" interrupts\" property"
2836 /* Check for a PHY device node - if missing then create one and
2837 * give it's phandle to the ethernet node */
2838 node = call_prom("finddevice", 1, 1,
2839 ADDR("/builtin/mdio/ethernet-phy"));
2840 if (!PHANDLE_VALID(node)) {
2841 prom_printf("Adding Ethernet PHY node\n");
2842 call_prom("interpret", 1, 1,
2843 " s\" /builtin/mdio\" find-device"
2845 " s\" ethernet-phy\" device-name"
2846 " 0x10 encode-int s\" reg\" property"
2850 " s\" /builtin/ethernet\" find-device"
2852 " s\" phy-handle\" property"
2857 static void __init fixup_device_tree_efika(void)
2859 int sound_irq[3] = { 2, 2, 0 };
2860 int bcomm_irq[3*16] = { 3,0,0, 3,1,0, 3,2,0, 3,3,0,
2861 3,4,0, 3,5,0, 3,6,0, 3,7,0,
2862 3,8,0, 3,9,0, 3,10,0, 3,11,0,
2863 3,12,0, 3,13,0, 3,14,0, 3,15,0 };
2868 /* Check if we're really running on a EFIKA */
2869 node = call_prom("finddevice", 1, 1, ADDR("/"));
2870 if (!PHANDLE_VALID(node))
2873 rv = prom_getprop(node, "model", prop, sizeof(prop));
2874 if (rv == PROM_ERROR)
2876 if (strcmp(prop, "EFIKA5K2"))
2879 prom_printf("Applying EFIKA device tree fixups\n");
2881 /* Claiming to be 'chrp' is death */
2882 node = call_prom("finddevice", 1, 1, ADDR("/"));
2883 rv = prom_getprop(node, "device_type", prop, sizeof(prop));
2884 if (rv != PROM_ERROR && (strcmp(prop, "chrp") == 0))
2885 prom_setprop(node, "/", "device_type", "efika", sizeof("efika"));
2887 /* CODEGEN,description is exposed in /proc/cpuinfo so
2889 rv = prom_getprop(node, "CODEGEN,description", prop, sizeof(prop));
2890 if (rv != PROM_ERROR && (strstr(prop, "CHRP")))
2891 prom_setprop(node, "/", "CODEGEN,description",
2892 "Efika 5200B PowerPC System",
2893 sizeof("Efika 5200B PowerPC System"));
2895 /* Fixup bestcomm interrupts property */
2896 node = call_prom("finddevice", 1, 1, ADDR("/builtin/bestcomm"));
2897 if (PHANDLE_VALID(node)) {
2898 len = prom_getproplen(node, "interrupts");
2900 prom_printf("Fixing bestcomm interrupts property\n");
2901 prom_setprop(node, "/builtin/bestcom", "interrupts",
2902 bcomm_irq, sizeof(bcomm_irq));
2906 /* Fixup sound interrupts property */
2907 node = call_prom("finddevice", 1, 1, ADDR("/builtin/sound"));
2908 if (PHANDLE_VALID(node)) {
2909 rv = prom_getprop(node, "interrupts", prop, sizeof(prop));
2910 if (rv == PROM_ERROR) {
2911 prom_printf("Adding sound interrupts property\n");
2912 prom_setprop(node, "/builtin/sound", "interrupts",
2913 sound_irq, sizeof(sound_irq));
2917 /* Make sure ethernet phy-handle property exists */
2918 fixup_device_tree_efika_add_phy();
2921 #define fixup_device_tree_efika()
2924 #ifdef CONFIG_PPC_PASEMI_NEMO
2926 * CFE supplied on Nemo is broken in several ways, biggest
2927 * problem is that it reassigns ISA interrupts to unused mpic ints.
2928 * Add an interrupt-controller property for the io-bridge to use
2929 * and correct the ints so we can attach them to an irq_domain
2931 static void __init fixup_device_tree_pasemi(void)
2933 u32 interrupts[2], parent, rval, val = 0;
2934 char *name, *pci_name;
2937 /* Find the root pci node */
2938 name = "/pxp@0,e0000000";
2939 iob = call_prom("finddevice", 1, 1, ADDR(name));
2940 if (!PHANDLE_VALID(iob))
2943 /* check if interrupt-controller node set yet */
2944 if (prom_getproplen(iob, "interrupt-controller") !=PROM_ERROR)
2947 prom_printf("adding interrupt-controller property for SB600...\n");
2949 prom_setprop(iob, name, "interrupt-controller", &val, 0);
2951 pci_name = "/pxp@0,e0000000/pci@11";
2952 node = call_prom("finddevice", 1, 1, ADDR(pci_name));
2955 for( ; prom_next_node(&node); ) {
2956 /* scan each node for one with an interrupt */
2957 if (!PHANDLE_VALID(node))
2960 rval = prom_getproplen(node, "interrupts");
2961 if (rval == 0 || rval == PROM_ERROR)
2964 prom_getprop(node, "interrupts", &interrupts, sizeof(interrupts));
2965 if ((interrupts[0] < 212) || (interrupts[0] > 222))
2968 /* found a node, update both interrupts and interrupt-parent */
2969 if ((interrupts[0] >= 212) && (interrupts[0] <= 215))
2970 interrupts[0] -= 203;
2971 if ((interrupts[0] >= 216) && (interrupts[0] <= 220))
2972 interrupts[0] -= 213;
2973 if (interrupts[0] == 221)
2975 if (interrupts[0] == 222)
2978 prom_setprop(node, pci_name, "interrupts", interrupts,
2979 sizeof(interrupts));
2980 prom_setprop(node, pci_name, "interrupt-parent", &parent,
2985 * The io-bridge has device_type set to 'io-bridge' change it to 'isa'
2986 * so that generic isa-bridge code can add the SB600 and its on-board
2989 name = "/pxp@0,e0000000/io-bridge@0";
2990 iob = call_prom("finddevice", 1, 1, ADDR(name));
2991 if (!PHANDLE_VALID(iob))
2994 /* device_type is already set, just change it. */
2996 prom_printf("Changing device_type of SB600 node...\n");
2998 prom_setprop(iob, name, "device_type", "isa", sizeof("isa"));
3000 #else /* !CONFIG_PPC_PASEMI_NEMO */
3001 static inline void fixup_device_tree_pasemi(void) { }
3004 static void __init fixup_device_tree(void)
3006 fixup_device_tree_maple();
3007 fixup_device_tree_maple_memory_controller();
3008 fixup_device_tree_chrp();
3009 fixup_device_tree_pmac();
3010 fixup_device_tree_efika();
3011 fixup_device_tree_pasemi();
3014 static void __init prom_find_boot_cpu(void)
3021 if (prom_getprop(prom.chosen, "cpu", &rval, sizeof(rval)) <= 0)
3023 prom_cpu = be32_to_cpu(rval);
3025 cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);
3027 if (!PHANDLE_VALID(cpu_pkg))
3030 prom_getprop(cpu_pkg, "reg", &rval, sizeof(rval));
3031 prom.cpu = be32_to_cpu(rval);
3033 prom_debug("Booting CPU hw index = %d\n", prom.cpu);
3036 static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
3038 #ifdef CONFIG_BLK_DEV_INITRD
3039 if (r3 && r4 && r4 != 0xdeadbeef) {
3042 prom_initrd_start = is_kernel_addr(r3) ? __pa(r3) : r3;
3043 prom_initrd_end = prom_initrd_start + r4;
3045 val = cpu_to_be64(prom_initrd_start);
3046 prom_setprop(prom.chosen, "/chosen", "linux,initrd-start",
3048 val = cpu_to_be64(prom_initrd_end);
3049 prom_setprop(prom.chosen, "/chosen", "linux,initrd-end",
3052 reserve_mem(prom_initrd_start,
3053 prom_initrd_end - prom_initrd_start);
3055 prom_debug("initrd_start=0x%lx\n", prom_initrd_start);
3056 prom_debug("initrd_end=0x%lx\n", prom_initrd_end);
3058 #endif /* CONFIG_BLK_DEV_INITRD */
3062 #ifdef CONFIG_RELOCATABLE
3063 static void reloc_toc(void)
3067 static void unreloc_toc(void)
3071 static void __reloc_toc(unsigned long offset, unsigned long nr_entries)
3074 unsigned long *toc_entry;
3076 /* Get the start of the TOC by using r2 directly. */
3077 asm volatile("addi %0,2,-0x8000" : "=b" (toc_entry));
3079 for (i = 0; i < nr_entries; i++) {
3080 *toc_entry = *toc_entry + offset;
3085 static void reloc_toc(void)
3087 unsigned long offset = reloc_offset();
3088 unsigned long nr_entries =
3089 (__prom_init_toc_end - __prom_init_toc_start) / sizeof(long);
3091 __reloc_toc(offset, nr_entries);
3096 static void unreloc_toc(void)
3098 unsigned long offset = reloc_offset();
3099 unsigned long nr_entries =
3100 (__prom_init_toc_end - __prom_init_toc_start) / sizeof(long);
3104 __reloc_toc(-offset, nr_entries);
3110 * We enter here early on, when the Open Firmware prom is still
3111 * handling exceptions and the MMU hash table for us.
3114 unsigned long __init prom_init(unsigned long r3, unsigned long r4,
3116 unsigned long r6, unsigned long r7,
3117 unsigned long kbase)
3122 unsigned long offset = reloc_offset();
3129 * First zero the BSS
3131 memset(&__bss_start, 0, __bss_stop - __bss_start);
3134 * Init interface to Open Firmware, get some node references,
3137 prom_init_client_services(pp);
3140 * See if this OF is old enough that we need to do explicit maps
3141 * and other workarounds
3146 * Init prom stdout device
3150 prom_printf("Preparing to boot %s", linux_banner);
3153 * Get default machine type. At this point, we do not differentiate
3154 * between pSeries SMP and pSeries LPAR
3156 of_platform = prom_find_machine_type();
3157 prom_printf("Detected machine type: %x\n", of_platform);
3159 #ifndef CONFIG_NONSTATIC_KERNEL
3160 /* Bail if this is a kdump kernel. */
3161 if (PHYSICAL_START > 0)
3162 prom_panic("Error: You can't boot a kdump kernel from OF!\n");
3166 * Check for an initrd
3168 prom_check_initrd(r3, r4);
3171 * Do early parsing of command line
3173 early_cmdline_parse();
3175 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
3177 * On pSeries, inform the firmware about our capabilities
3179 if (of_platform == PLATFORM_PSERIES ||
3180 of_platform == PLATFORM_PSERIES_LPAR)
3181 prom_send_capabilities();
3185 * Copy the CPU hold code
3187 if (of_platform != PLATFORM_POWERMAC)
3188 copy_and_flush(0, kbase, 0x100, 0);
3191 * Initialize memory management within prom_init
3196 * Determine which cpu is actually running right _now_
3198 prom_find_boot_cpu();
3201 * Initialize display devices
3203 prom_check_displays();
3205 #if defined(CONFIG_PPC64) && defined(__BIG_ENDIAN__)
3207 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
3208 * that uses the allocator, we need to make sure we get the top of memory
3209 * available for us here...
3211 if (of_platform == PLATFORM_PSERIES)
3212 prom_initialize_tce_table();
3216 * On non-powermacs, try to instantiate RTAS. PowerMacs don't
3217 * have a usable RTAS implementation.
3219 if (of_platform != PLATFORM_POWERMAC &&
3220 of_platform != PLATFORM_OPAL)
3221 prom_instantiate_rtas();
3223 #ifdef CONFIG_PPC_POWERNV
3224 if (of_platform == PLATFORM_OPAL)
3225 prom_instantiate_opal();
3226 #endif /* CONFIG_PPC_POWERNV */
3229 /* instantiate sml */
3230 prom_instantiate_sml();
3234 * On non-powermacs, put all CPUs in spin-loops.
3236 * PowerMacs use a different mechanism to spin CPUs
3238 * (This must be done after instanciating RTAS)
3240 if (of_platform != PLATFORM_POWERMAC &&
3241 of_platform != PLATFORM_OPAL)
3245 * Fill in some infos for use by the kernel later on
3247 if (prom_memory_limit) {
3248 __be64 val = cpu_to_be64(prom_memory_limit);
3249 prom_setprop(prom.chosen, "/chosen", "linux,memory-limit",
3254 prom_setprop(prom.chosen, "/chosen", "linux,iommu-off",
3257 if (prom_iommu_force_on)
3258 prom_setprop(prom.chosen, "/chosen", "linux,iommu-force-on",
3261 if (prom_tce_alloc_start) {
3262 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-start",
3263 &prom_tce_alloc_start,
3264 sizeof(prom_tce_alloc_start));
3265 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-end",
3266 &prom_tce_alloc_end,
3267 sizeof(prom_tce_alloc_end));
3272 * Fixup any known bugs in the device-tree
3274 fixup_device_tree();
3277 * Now finally create the flattened device-tree
3279 prom_printf("copying OF device tree...\n");
3280 flatten_device_tree();
3283 * in case stdin is USB and still active on IBM machines...
3284 * Unfortunately quiesce crashes on some powermacs if we have
3285 * closed stdin already (in particular the powerbook 101). It
3286 * appears that the OPAL version of OFW doesn't like it either.
3288 if (of_platform != PLATFORM_POWERMAC &&
3289 of_platform != PLATFORM_OPAL)
3293 * Call OF "quiesce" method to shut down pending DMA's from
3296 prom_printf("Quiescing Open Firmware ...\n");
3297 call_prom("quiesce", 0, 0);
3300 * And finally, call the kernel passing it the flattened device
3301 * tree and NULL as r5, thus triggering the new entry point which
3302 * is common to us and kexec
3304 hdr = dt_header_start;
3306 /* Don't print anything after quiesce under OPAL, it crashes OFW */
3307 if (of_platform != PLATFORM_OPAL) {
3308 prom_printf("Booting Linux via __start() @ 0x%lx ...\n", kbase);
3309 prom_debug("->dt_header_start=0x%lx\n", hdr);
3313 reloc_got2(-offset);
3318 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
3319 /* OPAL early debug gets the OPAL base & entry in r8 and r9 */
3320 __start(hdr, kbase, 0, 0, 0,
3321 prom_opal_base, prom_opal_entry);
3323 __start(hdr, kbase, 0, 0, 0, 0, 0);