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...) do { } while (0)
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);
305 * Both prom_print_hex & prom_print_dec takes an unsigned long as input so that
306 * we do not need __udivdi3 or __umoddi3 on 32bits.
308 static void __init prom_print_hex(unsigned long val)
310 int i, nibbles = sizeof(val)*2;
311 char buf[sizeof(val)*2+1];
313 for (i = nibbles-1; i >= 0; i--) {
314 buf[i] = (val & 0xf) + '0';
316 buf[i] += ('a'-'0'-10);
320 call_prom("write", 3, 1, prom.stdout, buf, nibbles);
323 /* max number of decimal digits in an unsigned long */
325 static void __init prom_print_dec(unsigned long val)
328 char buf[UL_DIGITS+1];
330 for (i = UL_DIGITS-1; i >= 0; i--) {
331 buf[i] = (val % 10) + '0';
336 /* shift stuff down */
337 size = UL_DIGITS - i;
338 call_prom("write", 3, 1, prom.stdout, buf+i, size);
342 static void __init prom_printf(const char *format, ...)
344 const char *p, *q, *s;
350 va_start(args, format);
351 for (p = format; *p != 0; p = q) {
352 for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
355 call_prom("write", 3, 1, prom.stdout, p, q - p);
360 call_prom("write", 3, 1, prom.stdout,
374 s = va_arg(args, const char *);
381 v = va_arg(args, unsigned int);
384 v = va_arg(args, unsigned long);
388 v = va_arg(args, unsigned long long);
397 v = va_arg(args, unsigned int);
400 v = va_arg(args, unsigned long);
404 v = va_arg(args, unsigned long long);
413 vs = va_arg(args, int);
416 vs = va_arg(args, long);
420 vs = va_arg(args, long long);
435 static unsigned int __init prom_claim(unsigned long virt, unsigned long size,
439 if (align == 0 && (OF_WORKAROUNDS & OF_WA_CLAIM)) {
441 * Old OF requires we claim physical and virtual separately
442 * and then map explicitly (assuming virtual mode)
447 ret = call_prom_ret("call-method", 5, 2, &result,
448 ADDR("claim"), prom.memory,
450 if (ret != 0 || result == -1)
452 ret = call_prom_ret("call-method", 5, 2, &result,
453 ADDR("claim"), prom.mmumap,
456 call_prom("call-method", 4, 1, ADDR("release"),
457 prom.memory, size, virt);
460 /* the 0x12 is M (coherence) + PP == read/write */
461 call_prom("call-method", 6, 1,
462 ADDR("map"), prom.mmumap, 0x12, size, virt, virt);
465 return call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size,
469 static void __init __attribute__((noreturn)) prom_panic(const char *reason)
472 /* Do not call exit because it clears the screen on pmac
473 * it also causes some sort of double-fault on early pmacs */
474 if (of_platform == PLATFORM_POWERMAC)
477 /* ToDo: should put up an SRC here on pSeries */
478 call_prom("exit", 0, 0);
480 for (;;) /* should never get here */
485 static int __init prom_next_node(phandle *nodep)
489 if ((node = *nodep) != 0
490 && (*nodep = call_prom("child", 1, 1, node)) != 0)
492 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
495 if ((node = call_prom("parent", 1, 1, node)) == 0)
497 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
502 static inline int prom_getprop(phandle node, const char *pname,
503 void *value, size_t valuelen)
505 return call_prom("getprop", 4, 1, node, ADDR(pname),
506 (u32)(unsigned long) value, (u32) valuelen);
509 static inline int prom_getproplen(phandle node, const char *pname)
511 return call_prom("getproplen", 2, 1, node, ADDR(pname));
514 static void add_string(char **str, const char *q)
524 static char *tohex(unsigned int x)
526 static char digits[] = "0123456789abcdef";
527 static char result[9];
534 result[i] = digits[x & 0xf];
536 } while (x != 0 && i > 0);
540 static int __init prom_setprop(phandle node, const char *nodename,
541 const char *pname, void *value, size_t valuelen)
545 if (!(OF_WORKAROUNDS & OF_WA_LONGTRAIL))
546 return call_prom("setprop", 4, 1, node, ADDR(pname),
547 (u32)(unsigned long) value, (u32) valuelen);
549 /* gah... setprop doesn't work on longtrail, have to use interpret */
551 add_string(&p, "dev");
552 add_string(&p, nodename);
553 add_string(&p, tohex((u32)(unsigned long) value));
554 add_string(&p, tohex(valuelen));
555 add_string(&p, tohex(ADDR(pname)));
556 add_string(&p, tohex(strlen(pname)));
557 add_string(&p, "property");
559 return call_prom("interpret", 1, 1, (u32)(unsigned long) cmd);
562 /* We can't use the standard versions because of relocation headaches. */
563 #define isxdigit(c) (('0' <= (c) && (c) <= '9') \
564 || ('a' <= (c) && (c) <= 'f') \
565 || ('A' <= (c) && (c) <= 'F'))
567 #define isdigit(c) ('0' <= (c) && (c) <= '9')
568 #define islower(c) ('a' <= (c) && (c) <= 'z')
569 #define toupper(c) (islower(c) ? ((c) - 'a' + 'A') : (c))
571 static unsigned long prom_strtoul(const char *cp, const char **endp)
573 unsigned long result = 0, base = 10, value;
578 if (toupper(*cp) == 'X') {
584 while (isxdigit(*cp) &&
585 (value = isdigit(*cp) ? *cp - '0' : toupper(*cp) - 'A' + 10) < base) {
586 result = result * base + value;
596 static unsigned long prom_memparse(const char *ptr, const char **retptr)
598 unsigned long ret = prom_strtoul(ptr, retptr);
602 * We can't use a switch here because GCC *may* generate a
603 * jump table which won't work, because we're not running at
604 * the address we're linked at.
606 if ('G' == **retptr || 'g' == **retptr)
609 if ('M' == **retptr || 'm' == **retptr)
612 if ('K' == **retptr || 'k' == **retptr)
624 * Early parsing of the command line passed to the kernel, used for
625 * "mem=x" and the options that affect the iommu
627 static void __init early_cmdline_parse(void)
634 prom_cmd_line[0] = 0;
636 if ((long)prom.chosen > 0)
637 l = prom_getprop(prom.chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
638 #ifdef CONFIG_CMDLINE
639 if (l <= 0 || p[0] == '\0') /* dbl check */
640 strlcpy(prom_cmd_line,
641 CONFIG_CMDLINE, sizeof(prom_cmd_line));
642 #endif /* CONFIG_CMDLINE */
643 prom_printf("command line: %s\n", prom_cmd_line);
646 opt = strstr(prom_cmd_line, "iommu=");
648 prom_printf("iommu opt is: %s\n", opt);
650 while (*opt && *opt == ' ')
652 if (!strncmp(opt, "off", 3))
654 else if (!strncmp(opt, "force", 5))
655 prom_iommu_force_on = 1;
658 opt = strstr(prom_cmd_line, "mem=");
661 prom_memory_limit = prom_memparse(opt, (const char **)&opt);
663 /* Align to 16 MB == size of ppc64 large page */
664 prom_memory_limit = ALIGN(prom_memory_limit, 0x1000000);
668 opt = strstr(prom_cmd_line, "disable_radix");
671 if (*opt && *opt == '=') {
674 if (kstrtobool(++opt, &val))
675 prom_radix_disable = false;
677 prom_radix_disable = val;
679 prom_radix_disable = true;
681 if (prom_radix_disable)
682 prom_debug("Radix disabled from cmdline\n");
685 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
687 * The architecture vector has an array of PVR mask/value pairs,
688 * followed by # option vectors - 1, followed by the option vectors.
690 * See prom.h for the definition of the bits specified in the
691 * architecture vector.
694 /* Firmware expects the value to be n - 1, where n is the # of vectors */
695 #define NUM_VECTORS(n) ((n) - 1)
698 * Firmware expects 1 + n - 2, where n is the length of the option vector in
699 * bytes. The 1 accounts for the length byte itself, the - 2 .. ?
701 #define VECTOR_LENGTH(n) (1 + (n) - 2)
703 struct option_vector1 {
709 struct option_vector2 {
723 struct option_vector3 {
728 struct option_vector4 {
733 struct option_vector5 {
745 u8 platform_facilities;
756 struct option_vector6 {
762 struct ibm_arch_vec {
763 struct { u32 mask, val; } pvrs[12];
768 struct option_vector1 vec1;
771 struct option_vector2 vec2;
774 struct option_vector3 vec3;
777 struct option_vector4 vec4;
780 struct option_vector5 vec5;
783 struct option_vector6 vec6;
786 struct ibm_arch_vec __cacheline_aligned ibm_architecture_vec = {
789 .mask = cpu_to_be32(0xfffe0000), /* POWER5/POWER5+ */
790 .val = cpu_to_be32(0x003a0000),
793 .mask = cpu_to_be32(0xffff0000), /* POWER6 */
794 .val = cpu_to_be32(0x003e0000),
797 .mask = cpu_to_be32(0xffff0000), /* POWER7 */
798 .val = cpu_to_be32(0x003f0000),
801 .mask = cpu_to_be32(0xffff0000), /* POWER8E */
802 .val = cpu_to_be32(0x004b0000),
805 .mask = cpu_to_be32(0xffff0000), /* POWER8NVL */
806 .val = cpu_to_be32(0x004c0000),
809 .mask = cpu_to_be32(0xffff0000), /* POWER8 */
810 .val = cpu_to_be32(0x004d0000),
813 .mask = cpu_to_be32(0xffff0000), /* POWER9 */
814 .val = cpu_to_be32(0x004e0000),
817 .mask = cpu_to_be32(0xffffffff), /* all 3.00-compliant */
818 .val = cpu_to_be32(0x0f000005),
821 .mask = cpu_to_be32(0xffffffff), /* all 2.07-compliant */
822 .val = cpu_to_be32(0x0f000004),
825 .mask = cpu_to_be32(0xffffffff), /* all 2.06-compliant */
826 .val = cpu_to_be32(0x0f000003),
829 .mask = cpu_to_be32(0xffffffff), /* all 2.05-compliant */
830 .val = cpu_to_be32(0x0f000002),
833 .mask = cpu_to_be32(0xfffffffe), /* all 2.04-compliant and earlier */
834 .val = cpu_to_be32(0x0f000001),
838 .num_vectors = NUM_VECTORS(6),
840 .vec1_len = VECTOR_LENGTH(sizeof(struct option_vector1)),
843 .arch_versions = OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 |
844 OV1_PPC_2_04 | OV1_PPC_2_05 | OV1_PPC_2_06 | OV1_PPC_2_07,
845 .arch_versions3 = OV1_PPC_3_00,
848 .vec2_len = VECTOR_LENGTH(sizeof(struct option_vector2)),
849 /* option vector 2: Open Firmware options supported */
851 .byte1 = OV2_REAL_MODE,
853 .real_base = cpu_to_be32(0xffffffff),
854 .real_size = cpu_to_be32(0xffffffff),
855 .virt_base = cpu_to_be32(0xffffffff),
856 .virt_size = cpu_to_be32(0xffffffff),
857 .load_base = cpu_to_be32(0xffffffff),
858 .min_rma = cpu_to_be32(512), /* 512MB min RMA */
859 .min_load = cpu_to_be32(0xffffffff), /* full client load */
860 .min_rma_percent = 0, /* min RMA percentage of total RAM */
861 .max_pft_size = 48, /* max log_2(hash table size) */
864 .vec3_len = VECTOR_LENGTH(sizeof(struct option_vector3)),
865 /* option vector 3: processor options supported */
867 .byte1 = 0, /* don't ignore, don't halt */
868 .byte2 = OV3_FP | OV3_VMX | OV3_DFP,
871 .vec4_len = VECTOR_LENGTH(sizeof(struct option_vector4)),
872 /* option vector 4: IBM PAPR implementation */
874 .byte1 = 0, /* don't halt */
875 .min_vp_cap = OV4_MIN_ENT_CAP, /* minimum VP entitled capacity */
878 .vec5_len = VECTOR_LENGTH(sizeof(struct option_vector5)),
879 /* option vector 5: PAPR/OF options */
881 .byte1 = 0, /* don't ignore, don't halt */
882 .byte2 = OV5_FEAT(OV5_LPAR) | OV5_FEAT(OV5_SPLPAR) | OV5_FEAT(OV5_LARGE_PAGES) |
883 OV5_FEAT(OV5_DRCONF_MEMORY) | OV5_FEAT(OV5_DONATE_DEDICATE_CPU) |
884 #ifdef CONFIG_PCI_MSI
885 /* PCIe/MSI support. Without MSI full PCIe is not supported */
892 #ifdef CONFIG_PPC_SMLPAR
893 OV5_FEAT(OV5_CMO) | OV5_FEAT(OV5_XCMO),
897 .associativity = OV5_FEAT(OV5_TYPE1_AFFINITY) | OV5_FEAT(OV5_PRRN),
898 .bin_opts = OV5_FEAT(OV5_RESIZE_HPT) | OV5_FEAT(OV5_HP_EVT),
899 .micro_checkpoint = 0,
901 .max_cpus = cpu_to_be32(NR_CPUS), /* number of cores supported */
904 .platform_facilities = OV5_FEAT(OV5_PFO_HW_RNG) | OV5_FEAT(OV5_PFO_HW_ENCR) | OV5_FEAT(OV5_PFO_HW_842),
908 .byte22 = OV5_FEAT(OV5_DRMEM_V2),
915 /* option vector 6: IBM PAPR hints */
916 .vec6_len = VECTOR_LENGTH(sizeof(struct option_vector6)),
920 .os_name = OV6_LINUX,
924 /* Old method - ELF header with PT_NOTE sections only works on BE */
925 #ifdef __BIG_ENDIAN__
926 static struct fake_elf {
933 char name[8]; /* "PowerPC" */
947 char name[24]; /* "IBM,RPA-Client-Config" */
961 .e_ident = { 0x7f, 'E', 'L', 'F',
962 ELFCLASS32, ELFDATA2MSB, EV_CURRENT },
963 .e_type = ET_EXEC, /* yeah right */
965 .e_version = EV_CURRENT,
966 .e_phoff = offsetof(struct fake_elf, phdr),
967 .e_phentsize = sizeof(Elf32_Phdr),
973 .p_offset = offsetof(struct fake_elf, chrpnote),
974 .p_filesz = sizeof(struct chrpnote)
977 .p_offset = offsetof(struct fake_elf, rpanote),
978 .p_filesz = sizeof(struct rpanote)
982 .namesz = sizeof("PowerPC"),
983 .descsz = sizeof(struct chrpdesc),
987 .real_mode = ~0U, /* ~0 means "don't care" */
996 .namesz = sizeof("IBM,RPA-Client-Config"),
997 .descsz = sizeof(struct rpadesc),
999 .name = "IBM,RPA-Client-Config",
1002 .min_rmo_size = 64, /* in megabytes */
1003 .min_rmo_percent = 0,
1004 .max_pft_size = 48, /* 2^48 bytes max PFT size */
1011 #endif /* __BIG_ENDIAN__ */
1013 static int __init prom_count_smt_threads(void)
1019 /* Pick up th first CPU node we can find */
1020 for (node = 0; prom_next_node(&node); ) {
1022 prom_getprop(node, "device_type", type, sizeof(type));
1024 if (strcmp(type, "cpu"))
1027 * There is an entry for each smt thread, each entry being
1028 * 4 bytes long. All cpus should have the same number of
1029 * smt threads, so return after finding the first.
1031 plen = prom_getproplen(node, "ibm,ppc-interrupt-server#s");
1032 if (plen == PROM_ERROR)
1035 prom_debug("Found %lu smt threads per core\n", (unsigned long)plen);
1038 if (plen < 1 || plen > 64) {
1039 prom_printf("Threads per core %lu out of bounds, assuming 1\n",
1040 (unsigned long)plen);
1045 prom_debug("No threads found, assuming 1 per core\n");
1051 static void __init prom_parse_mmu_model(u8 val,
1052 struct platform_support *support)
1055 case OV5_FEAT(OV5_MMU_DYNAMIC):
1056 case OV5_FEAT(OV5_MMU_EITHER): /* Either Available */
1057 prom_debug("MMU - either supported\n");
1058 support->radix_mmu = !prom_radix_disable;
1059 support->hash_mmu = true;
1061 case OV5_FEAT(OV5_MMU_RADIX): /* Only Radix */
1062 prom_debug("MMU - radix only\n");
1063 if (prom_radix_disable) {
1065 * If we __have__ to do radix, we're better off ignoring
1066 * the command line rather than not booting.
1068 prom_printf("WARNING: Ignoring cmdline option disable_radix\n");
1070 support->radix_mmu = true;
1072 case OV5_FEAT(OV5_MMU_HASH):
1073 prom_debug("MMU - hash only\n");
1074 support->hash_mmu = true;
1077 prom_debug("Unknown mmu support option: 0x%x\n", val);
1082 static void __init prom_parse_xive_model(u8 val,
1083 struct platform_support *support)
1086 case OV5_FEAT(OV5_XIVE_EITHER): /* Either Available */
1087 prom_debug("XIVE - either mode supported\n");
1088 support->xive = true;
1090 case OV5_FEAT(OV5_XIVE_EXPLOIT): /* Only Exploitation mode */
1091 prom_debug("XIVE - exploitation mode supported\n");
1092 support->xive = true;
1094 case OV5_FEAT(OV5_XIVE_LEGACY): /* Only Legacy mode */
1095 prom_debug("XIVE - legacy mode supported\n");
1098 prom_debug("Unknown xive support option: 0x%x\n", val);
1103 static void __init prom_parse_platform_support(u8 index, u8 val,
1104 struct platform_support *support)
1107 case OV5_INDX(OV5_MMU_SUPPORT): /* MMU Model */
1108 prom_parse_mmu_model(val & OV5_FEAT(OV5_MMU_SUPPORT), support);
1110 case OV5_INDX(OV5_RADIX_GTSE): /* Radix Extensions */
1111 if (val & OV5_FEAT(OV5_RADIX_GTSE)) {
1112 prom_debug("Radix - GTSE supported\n");
1113 support->radix_gtse = true;
1116 case OV5_INDX(OV5_XIVE_SUPPORT): /* Interrupt mode */
1117 prom_parse_xive_model(val & OV5_FEAT(OV5_XIVE_SUPPORT),
1123 static void __init prom_check_platform_support(void)
1125 struct platform_support supported = {
1128 .radix_gtse = false,
1131 int prop_len = prom_getproplen(prom.chosen,
1132 "ibm,arch-vec-5-platform-support");
1136 prom_debug("Found ibm,arch-vec-5-platform-support, len: %d\n",
1138 prom_getprop(prom.chosen, "ibm,arch-vec-5-platform-support",
1140 for (i = 0; i < prop_len; i += 2) {
1141 prom_debug("%d: index = 0x%x val = 0x%x\n", i / 2
1144 prom_parse_platform_support(vec[i], vec[i + 1],
1149 if (supported.radix_mmu && supported.radix_gtse &&
1150 IS_ENABLED(CONFIG_PPC_RADIX_MMU)) {
1151 /* Radix preferred - but we require GTSE for now */
1152 prom_debug("Asking for radix with GTSE\n");
1153 ibm_architecture_vec.vec5.mmu = OV5_FEAT(OV5_MMU_RADIX);
1154 ibm_architecture_vec.vec5.radix_ext = OV5_FEAT(OV5_RADIX_GTSE);
1155 } else if (supported.hash_mmu) {
1156 /* Default to hash mmu (if we can) */
1157 prom_debug("Asking for hash\n");
1158 ibm_architecture_vec.vec5.mmu = OV5_FEAT(OV5_MMU_HASH);
1160 /* We're probably on a legacy hypervisor */
1161 prom_debug("Assuming legacy hash support\n");
1164 if (supported.xive) {
1165 prom_debug("Asking for XIVE\n");
1166 ibm_architecture_vec.vec5.intarch = OV5_FEAT(OV5_XIVE_EXPLOIT);
1170 static void __init prom_send_capabilities(void)
1176 /* Check ibm,arch-vec-5-platform-support and fixup vec5 if required */
1177 prom_check_platform_support();
1179 root = call_prom("open", 1, 1, ADDR("/"));
1181 /* We need to tell the FW about the number of cores we support.
1183 * To do that, we count the number of threads on the first core
1184 * (we assume this is the same for all cores) and use it to
1188 cores = DIV_ROUND_UP(NR_CPUS, prom_count_smt_threads());
1189 prom_printf("Max number of cores passed to firmware: %u (NR_CPUS = %d)\n",
1192 ibm_architecture_vec.vec5.max_cpus = cpu_to_be32(cores);
1194 /* try calling the ibm,client-architecture-support method */
1195 prom_printf("Calling ibm,client-architecture-support...");
1196 if (call_prom_ret("call-method", 3, 2, &ret,
1197 ADDR("ibm,client-architecture-support"),
1199 ADDR(&ibm_architecture_vec)) == 0) {
1200 /* the call exists... */
1202 prom_printf("\nWARNING: ibm,client-architecture"
1203 "-support call FAILED!\n");
1204 call_prom("close", 1, 0, root);
1205 prom_printf(" done\n");
1208 call_prom("close", 1, 0, root);
1209 prom_printf(" not implemented\n");
1212 #ifdef __BIG_ENDIAN__
1216 /* no ibm,client-architecture-support call, try the old way */
1217 elfloader = call_prom("open", 1, 1,
1218 ADDR("/packages/elf-loader"));
1219 if (elfloader == 0) {
1220 prom_printf("couldn't open /packages/elf-loader\n");
1223 call_prom("call-method", 3, 1, ADDR("process-elf-header"),
1224 elfloader, ADDR(&fake_elf));
1225 call_prom("close", 1, 0, elfloader);
1227 #endif /* __BIG_ENDIAN__ */
1229 #endif /* #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) */
1232 * Memory allocation strategy... our layout is normally:
1234 * at 14Mb or more we have vmlinux, then a gap and initrd. In some
1235 * rare cases, initrd might end up being before the kernel though.
1236 * We assume this won't override the final kernel at 0, we have no
1237 * provision to handle that in this version, but it should hopefully
1240 * alloc_top is set to the top of RMO, eventually shrink down if the
1243 * alloc_bottom is set to the top of kernel/initrd
1245 * from there, allocations are done this way : rtas is allocated
1246 * topmost, and the device-tree is allocated from the bottom. We try
1247 * to grow the device-tree allocation as we progress. If we can't,
1248 * then we fail, we don't currently have a facility to restart
1249 * elsewhere, but that shouldn't be necessary.
1251 * Note that calls to reserve_mem have to be done explicitly, memory
1252 * allocated with either alloc_up or alloc_down isn't automatically
1258 * Allocates memory in the RMO upward from the kernel/initrd
1260 * When align is 0, this is a special case, it means to allocate in place
1261 * at the current location of alloc_bottom or fail (that is basically
1262 * extending the previous allocation). Used for the device-tree flattening
1264 static unsigned long __init alloc_up(unsigned long size, unsigned long align)
1266 unsigned long base = alloc_bottom;
1267 unsigned long addr = 0;
1270 base = _ALIGN_UP(base, align);
1271 prom_debug("%s(%lx, %lx)\n", __func__, size, align);
1273 prom_panic("alloc_up() called with mem not initialized\n");
1276 base = _ALIGN_UP(alloc_bottom, align);
1278 base = alloc_bottom;
1280 for(; (base + size) <= alloc_top;
1281 base = _ALIGN_UP(base + 0x100000, align)) {
1282 prom_debug(" trying: 0x%lx\n\r", base);
1283 addr = (unsigned long)prom_claim(base, size, 0);
1284 if (addr != PROM_ERROR && addr != 0)
1292 alloc_bottom = addr + size;
1294 prom_debug(" -> %lx\n", addr);
1295 prom_debug(" alloc_bottom : %lx\n", alloc_bottom);
1296 prom_debug(" alloc_top : %lx\n", alloc_top);
1297 prom_debug(" alloc_top_hi : %lx\n", alloc_top_high);
1298 prom_debug(" rmo_top : %lx\n", rmo_top);
1299 prom_debug(" ram_top : %lx\n", ram_top);
1305 * Allocates memory downward, either from top of RMO, or if highmem
1306 * is set, from the top of RAM. Note that this one doesn't handle
1307 * failures. It does claim memory if highmem is not set.
1309 static unsigned long __init alloc_down(unsigned long size, unsigned long align,
1312 unsigned long base, addr = 0;
1314 prom_debug("%s(%lx, %lx, %s)\n", __func__, size, align,
1315 highmem ? "(high)" : "(low)");
1317 prom_panic("alloc_down() called with mem not initialized\n");
1320 /* Carve out storage for the TCE table. */
1321 addr = _ALIGN_DOWN(alloc_top_high - size, align);
1322 if (addr <= alloc_bottom)
1324 /* Will we bump into the RMO ? If yes, check out that we
1325 * didn't overlap existing allocations there, if we did,
1326 * we are dead, we must be the first in town !
1328 if (addr < rmo_top) {
1329 /* Good, we are first */
1330 if (alloc_top == rmo_top)
1331 alloc_top = rmo_top = addr;
1335 alloc_top_high = addr;
1339 base = _ALIGN_DOWN(alloc_top - size, align);
1340 for (; base > alloc_bottom;
1341 base = _ALIGN_DOWN(base - 0x100000, align)) {
1342 prom_debug(" trying: 0x%lx\n\r", base);
1343 addr = (unsigned long)prom_claim(base, size, 0);
1344 if (addr != PROM_ERROR && addr != 0)
1353 prom_debug(" -> %lx\n", addr);
1354 prom_debug(" alloc_bottom : %lx\n", alloc_bottom);
1355 prom_debug(" alloc_top : %lx\n", alloc_top);
1356 prom_debug(" alloc_top_hi : %lx\n", alloc_top_high);
1357 prom_debug(" rmo_top : %lx\n", rmo_top);
1358 prom_debug(" ram_top : %lx\n", ram_top);
1364 * Parse a "reg" cell
1366 static unsigned long __init prom_next_cell(int s, cell_t **cellp)
1369 unsigned long r = 0;
1371 /* Ignore more than 2 cells */
1372 while (s > sizeof(unsigned long) / 4) {
1376 r = be32_to_cpu(*p++);
1380 r |= be32_to_cpu(*(p++));
1388 * Very dumb function for adding to the memory reserve list, but
1389 * we don't need anything smarter at this point
1391 * XXX Eventually check for collisions. They should NEVER happen.
1392 * If problems seem to show up, it would be a good start to track
1395 static void __init reserve_mem(u64 base, u64 size)
1397 u64 top = base + size;
1398 unsigned long cnt = mem_reserve_cnt;
1403 /* We need to always keep one empty entry so that we
1404 * have our terminator with "size" set to 0 since we are
1405 * dumb and just copy this entire array to the boot params
1407 base = _ALIGN_DOWN(base, PAGE_SIZE);
1408 top = _ALIGN_UP(top, PAGE_SIZE);
1411 if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))
1412 prom_panic("Memory reserve map exhausted !\n");
1413 mem_reserve_map[cnt].base = cpu_to_be64(base);
1414 mem_reserve_map[cnt].size = cpu_to_be64(size);
1415 mem_reserve_cnt = cnt + 1;
1419 * Initialize memory allocation mechanism, parse "memory" nodes and
1420 * obtain that way the top of memory and RMO to setup out local allocator
1422 static void __init prom_init_mem(void)
1425 char *path, type[64];
1432 * We iterate the memory nodes to find
1433 * 1) top of RMO (first node)
1436 val = cpu_to_be32(2);
1437 prom_getprop(prom.root, "#address-cells", &val, sizeof(val));
1438 rac = be32_to_cpu(val);
1439 val = cpu_to_be32(1);
1440 prom_getprop(prom.root, "#size-cells", &val, sizeof(rsc));
1441 rsc = be32_to_cpu(val);
1442 prom_debug("root_addr_cells: %x\n", rac);
1443 prom_debug("root_size_cells: %x\n", rsc);
1445 prom_debug("scanning memory:\n");
1446 path = prom_scratch;
1448 for (node = 0; prom_next_node(&node); ) {
1450 prom_getprop(node, "device_type", type, sizeof(type));
1454 * CHRP Longtrail machines have no device_type
1455 * on the memory node, so check the name instead...
1457 prom_getprop(node, "name", type, sizeof(type));
1459 if (strcmp(type, "memory"))
1462 plen = prom_getprop(node, "reg", regbuf, sizeof(regbuf));
1463 if (plen > sizeof(regbuf)) {
1464 prom_printf("memory node too large for buffer !\n");
1465 plen = sizeof(regbuf);
1468 endp = p + (plen / sizeof(cell_t));
1471 memset(path, 0, PROM_SCRATCH_SIZE);
1472 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
1473 prom_debug(" node %s :\n", path);
1474 #endif /* DEBUG_PROM */
1476 while ((endp - p) >= (rac + rsc)) {
1477 unsigned long base, size;
1479 base = prom_next_cell(rac, &p);
1480 size = prom_next_cell(rsc, &p);
1484 prom_debug(" %lx %lx\n", base, size);
1485 if (base == 0 && (of_platform & PLATFORM_LPAR))
1487 if ((base + size) > ram_top)
1488 ram_top = base + size;
1492 alloc_bottom = PAGE_ALIGN((unsigned long)&_end + 0x4000);
1495 * If prom_memory_limit is set we reduce the upper limits *except* for
1496 * alloc_top_high. This must be the real top of RAM so we can put
1500 alloc_top_high = ram_top;
1502 if (prom_memory_limit) {
1503 if (prom_memory_limit <= alloc_bottom) {
1504 prom_printf("Ignoring mem=%lx <= alloc_bottom.\n",
1506 prom_memory_limit = 0;
1507 } else if (prom_memory_limit >= ram_top) {
1508 prom_printf("Ignoring mem=%lx >= ram_top.\n",
1510 prom_memory_limit = 0;
1512 ram_top = prom_memory_limit;
1513 rmo_top = min(rmo_top, prom_memory_limit);
1518 * Setup our top alloc point, that is top of RMO or top of
1519 * segment 0 when running non-LPAR.
1520 * Some RS64 machines have buggy firmware where claims up at
1521 * 1GB fail. Cap at 768MB as a workaround.
1522 * Since 768MB is plenty of room, and we need to cap to something
1523 * reasonable on 32-bit, cap at 768MB on all machines.
1527 rmo_top = min(0x30000000ul, rmo_top);
1528 alloc_top = rmo_top;
1529 alloc_top_high = ram_top;
1532 * Check if we have an initrd after the kernel but still inside
1533 * the RMO. If we do move our bottom point to after it.
1535 if (prom_initrd_start &&
1536 prom_initrd_start < rmo_top &&
1537 prom_initrd_end > alloc_bottom)
1538 alloc_bottom = PAGE_ALIGN(prom_initrd_end);
1540 prom_printf("memory layout at init:\n");
1541 prom_printf(" memory_limit : %lx (16 MB aligned)\n",
1543 prom_printf(" alloc_bottom : %lx\n", alloc_bottom);
1544 prom_printf(" alloc_top : %lx\n", alloc_top);
1545 prom_printf(" alloc_top_hi : %lx\n", alloc_top_high);
1546 prom_printf(" rmo_top : %lx\n", rmo_top);
1547 prom_printf(" ram_top : %lx\n", ram_top);
1550 static void __init prom_close_stdin(void)
1555 if (prom_getprop(prom.chosen, "stdin", &val, sizeof(val)) > 0) {
1556 stdin = be32_to_cpu(val);
1557 call_prom("close", 1, 0, stdin);
1561 #ifdef CONFIG_PPC_POWERNV
1563 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
1564 static u64 __initdata prom_opal_base;
1565 static u64 __initdata prom_opal_entry;
1569 * Allocate room for and instantiate OPAL
1571 static void __init prom_instantiate_opal(void)
1576 u64 size = 0, align = 0x10000;
1580 prom_debug("prom_instantiate_opal: start...\n");
1582 opal_node = call_prom("finddevice", 1, 1, ADDR("/ibm,opal"));
1583 prom_debug("opal_node: %x\n", opal_node);
1584 if (!PHANDLE_VALID(opal_node))
1588 prom_getprop(opal_node, "opal-runtime-size", &val64, sizeof(val64));
1589 size = be64_to_cpu(val64);
1593 prom_getprop(opal_node, "opal-runtime-alignment", &val64,sizeof(val64));
1594 align = be64_to_cpu(val64);
1596 base = alloc_down(size, align, 0);
1598 prom_printf("OPAL allocation failed !\n");
1602 opal_inst = call_prom("open", 1, 1, ADDR("/ibm,opal"));
1603 if (!IHANDLE_VALID(opal_inst)) {
1604 prom_printf("opening opal package failed (%x)\n", opal_inst);
1608 prom_printf("instantiating opal at 0x%llx...", base);
1610 if (call_prom_ret("call-method", 4, 3, rets,
1611 ADDR("load-opal-runtime"),
1613 base >> 32, base & 0xffffffff) != 0
1614 || (rets[0] == 0 && rets[1] == 0)) {
1615 prom_printf(" failed\n");
1618 entry = (((u64)rets[0]) << 32) | rets[1];
1620 prom_printf(" done\n");
1622 reserve_mem(base, size);
1624 prom_debug("opal base = 0x%llx\n", base);
1625 prom_debug("opal align = 0x%llx\n", align);
1626 prom_debug("opal entry = 0x%llx\n", entry);
1627 prom_debug("opal size = 0x%llx\n", size);
1629 prom_setprop(opal_node, "/ibm,opal", "opal-base-address",
1630 &base, sizeof(base));
1631 prom_setprop(opal_node, "/ibm,opal", "opal-entry-address",
1632 &entry, sizeof(entry));
1634 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
1635 prom_opal_base = base;
1636 prom_opal_entry = entry;
1638 prom_debug("prom_instantiate_opal: end...\n");
1641 #endif /* CONFIG_PPC_POWERNV */
1644 * Allocate room for and instantiate RTAS
1646 static void __init prom_instantiate_rtas(void)
1650 u32 base, entry = 0;
1654 prom_debug("prom_instantiate_rtas: start...\n");
1656 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1657 prom_debug("rtas_node: %x\n", rtas_node);
1658 if (!PHANDLE_VALID(rtas_node))
1662 prom_getprop(rtas_node, "rtas-size", &val, sizeof(size));
1663 size = be32_to_cpu(val);
1667 base = alloc_down(size, PAGE_SIZE, 0);
1669 prom_panic("Could not allocate memory for RTAS\n");
1671 rtas_inst = call_prom("open", 1, 1, ADDR("/rtas"));
1672 if (!IHANDLE_VALID(rtas_inst)) {
1673 prom_printf("opening rtas package failed (%x)\n", rtas_inst);
1677 prom_printf("instantiating rtas at 0x%x...", base);
1679 if (call_prom_ret("call-method", 3, 2, &entry,
1680 ADDR("instantiate-rtas"),
1681 rtas_inst, base) != 0
1683 prom_printf(" failed\n");
1686 prom_printf(" done\n");
1688 reserve_mem(base, size);
1690 val = cpu_to_be32(base);
1691 prom_setprop(rtas_node, "/rtas", "linux,rtas-base",
1693 val = cpu_to_be32(entry);
1694 prom_setprop(rtas_node, "/rtas", "linux,rtas-entry",
1697 /* Check if it supports "query-cpu-stopped-state" */
1698 if (prom_getprop(rtas_node, "query-cpu-stopped-state",
1699 &val, sizeof(val)) != PROM_ERROR)
1700 rtas_has_query_cpu_stopped = true;
1702 prom_debug("rtas base = 0x%x\n", base);
1703 prom_debug("rtas entry = 0x%x\n", entry);
1704 prom_debug("rtas size = 0x%x\n", size);
1706 prom_debug("prom_instantiate_rtas: end...\n");
1711 * Allocate room for and instantiate Stored Measurement Log (SML)
1713 static void __init prom_instantiate_sml(void)
1715 phandle ibmvtpm_node;
1716 ihandle ibmvtpm_inst;
1717 u32 entry = 0, size = 0, succ = 0;
1721 prom_debug("prom_instantiate_sml: start...\n");
1723 ibmvtpm_node = call_prom("finddevice", 1, 1, ADDR("/vdevice/vtpm"));
1724 prom_debug("ibmvtpm_node: %x\n", ibmvtpm_node);
1725 if (!PHANDLE_VALID(ibmvtpm_node))
1728 ibmvtpm_inst = call_prom("open", 1, 1, ADDR("/vdevice/vtpm"));
1729 if (!IHANDLE_VALID(ibmvtpm_inst)) {
1730 prom_printf("opening vtpm package failed (%x)\n", ibmvtpm_inst);
1734 if (prom_getprop(ibmvtpm_node, "ibm,sml-efi-reformat-supported",
1735 &val, sizeof(val)) != PROM_ERROR) {
1736 if (call_prom_ret("call-method", 2, 2, &succ,
1737 ADDR("reformat-sml-to-efi-alignment"),
1738 ibmvtpm_inst) != 0 || succ == 0) {
1739 prom_printf("Reformat SML to EFI alignment failed\n");
1743 if (call_prom_ret("call-method", 2, 2, &size,
1744 ADDR("sml-get-allocated-size"),
1745 ibmvtpm_inst) != 0 || size == 0) {
1746 prom_printf("SML get allocated size failed\n");
1750 if (call_prom_ret("call-method", 2, 2, &size,
1751 ADDR("sml-get-handover-size"),
1752 ibmvtpm_inst) != 0 || size == 0) {
1753 prom_printf("SML get handover size failed\n");
1758 base = alloc_down(size, PAGE_SIZE, 0);
1760 prom_panic("Could not allocate memory for sml\n");
1762 prom_printf("instantiating sml at 0x%llx...", base);
1764 memset((void *)base, 0, size);
1766 if (call_prom_ret("call-method", 4, 2, &entry,
1767 ADDR("sml-handover"),
1768 ibmvtpm_inst, size, base) != 0 || entry == 0) {
1769 prom_printf("SML handover failed\n");
1772 prom_printf(" done\n");
1774 reserve_mem(base, size);
1776 prom_setprop(ibmvtpm_node, "/vdevice/vtpm", "linux,sml-base",
1777 &base, sizeof(base));
1778 prom_setprop(ibmvtpm_node, "/vdevice/vtpm", "linux,sml-size",
1779 &size, sizeof(size));
1781 prom_debug("sml base = 0x%llx\n", base);
1782 prom_debug("sml size = 0x%x\n", size);
1784 prom_debug("prom_instantiate_sml: end...\n");
1788 * Allocate room for and initialize TCE tables
1790 #ifdef __BIG_ENDIAN__
1791 static void __init prom_initialize_tce_table(void)
1795 char compatible[64], type[64], model[64];
1796 char *path = prom_scratch;
1798 u32 minalign, minsize;
1799 u64 tce_entry, *tce_entryp;
1800 u64 local_alloc_top, local_alloc_bottom;
1806 prom_debug("starting prom_initialize_tce_table\n");
1808 /* Cache current top of allocs so we reserve a single block */
1809 local_alloc_top = alloc_top_high;
1810 local_alloc_bottom = local_alloc_top;
1812 /* Search all nodes looking for PHBs. */
1813 for (node = 0; prom_next_node(&node); ) {
1817 prom_getprop(node, "compatible",
1818 compatible, sizeof(compatible));
1819 prom_getprop(node, "device_type", type, sizeof(type));
1820 prom_getprop(node, "model", model, sizeof(model));
1822 if ((type[0] == 0) || (strstr(type, "pci") == NULL))
1825 /* Keep the old logic intact to avoid regression. */
1826 if (compatible[0] != 0) {
1827 if ((strstr(compatible, "python") == NULL) &&
1828 (strstr(compatible, "Speedwagon") == NULL) &&
1829 (strstr(compatible, "Winnipeg") == NULL))
1831 } else if (model[0] != 0) {
1832 if ((strstr(model, "ython") == NULL) &&
1833 (strstr(model, "peedwagon") == NULL) &&
1834 (strstr(model, "innipeg") == NULL))
1838 if (prom_getprop(node, "tce-table-minalign", &minalign,
1839 sizeof(minalign)) == PROM_ERROR)
1841 if (prom_getprop(node, "tce-table-minsize", &minsize,
1842 sizeof(minsize)) == PROM_ERROR)
1843 minsize = 4UL << 20;
1846 * Even though we read what OF wants, we just set the table
1847 * size to 4 MB. This is enough to map 2GB of PCI DMA space.
1848 * By doing this, we avoid the pitfalls of trying to DMA to
1849 * MMIO space and the DMA alias hole.
1851 minsize = 4UL << 20;
1853 /* Align to the greater of the align or size */
1854 align = max(minalign, minsize);
1855 base = alloc_down(minsize, align, 1);
1857 prom_panic("ERROR, cannot find space for TCE table.\n");
1858 if (base < local_alloc_bottom)
1859 local_alloc_bottom = base;
1861 /* It seems OF doesn't null-terminate the path :-( */
1862 memset(path, 0, PROM_SCRATCH_SIZE);
1863 /* Call OF to setup the TCE hardware */
1864 if (call_prom("package-to-path", 3, 1, node,
1865 path, PROM_SCRATCH_SIZE-1) == PROM_ERROR) {
1866 prom_printf("package-to-path failed\n");
1869 /* Save away the TCE table attributes for later use. */
1870 prom_setprop(node, path, "linux,tce-base", &base, sizeof(base));
1871 prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize));
1873 prom_debug("TCE table: %s\n", path);
1874 prom_debug("\tnode = 0x%x\n", node);
1875 prom_debug("\tbase = 0x%llx\n", base);
1876 prom_debug("\tsize = 0x%x\n", minsize);
1878 /* Initialize the table to have a one-to-one mapping
1879 * over the allocated size.
1881 tce_entryp = (u64 *)base;
1882 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) {
1883 tce_entry = (i << PAGE_SHIFT);
1885 *tce_entryp = tce_entry;
1888 prom_printf("opening PHB %s", path);
1889 phb_node = call_prom("open", 1, 1, path);
1891 prom_printf("... failed\n");
1893 prom_printf("... done\n");
1895 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
1896 phb_node, -1, minsize,
1897 (u32) base, (u32) (base >> 32));
1898 call_prom("close", 1, 0, phb_node);
1901 reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);
1903 /* These are only really needed if there is a memory limit in
1904 * effect, but we don't know so export them always. */
1905 prom_tce_alloc_start = local_alloc_bottom;
1906 prom_tce_alloc_end = local_alloc_top;
1908 /* Flag the first invalid entry */
1909 prom_debug("ending prom_initialize_tce_table\n");
1911 #endif /* __BIG_ENDIAN__ */
1912 #endif /* CONFIG_PPC64 */
1915 * With CHRP SMP we need to use the OF to start the other processors.
1916 * We can't wait until smp_boot_cpus (the OF is trashed by then)
1917 * so we have to put the processors into a holding pattern controlled
1918 * by the kernel (not OF) before we destroy the OF.
1920 * This uses a chunk of low memory, puts some holding pattern
1921 * code there and sends the other processors off to there until
1922 * smp_boot_cpus tells them to do something. The holding pattern
1923 * checks that address until its cpu # is there, when it is that
1924 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care
1925 * of setting those values.
1927 * We also use physical address 0x4 here to tell when a cpu
1928 * is in its holding pattern code.
1933 * We want to reference the copy of __secondary_hold_* in the
1934 * 0 - 0x100 address range
1936 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff)
1938 static void __init prom_hold_cpus(void)
1943 unsigned long *spinloop
1944 = (void *) LOW_ADDR(__secondary_hold_spinloop);
1945 unsigned long *acknowledge
1946 = (void *) LOW_ADDR(__secondary_hold_acknowledge);
1947 unsigned long secondary_hold = LOW_ADDR(__secondary_hold);
1950 * On pseries, if RTAS supports "query-cpu-stopped-state",
1951 * we skip this stage, the CPUs will be started by the
1952 * kernel using RTAS.
1954 if ((of_platform == PLATFORM_PSERIES ||
1955 of_platform == PLATFORM_PSERIES_LPAR) &&
1956 rtas_has_query_cpu_stopped) {
1957 prom_printf("prom_hold_cpus: skipped\n");
1961 prom_debug("prom_hold_cpus: start...\n");
1962 prom_debug(" 1) spinloop = 0x%lx\n", (unsigned long)spinloop);
1963 prom_debug(" 1) *spinloop = 0x%lx\n", *spinloop);
1964 prom_debug(" 1) acknowledge = 0x%lx\n",
1965 (unsigned long)acknowledge);
1966 prom_debug(" 1) *acknowledge = 0x%lx\n", *acknowledge);
1967 prom_debug(" 1) secondary_hold = 0x%lx\n", secondary_hold);
1969 /* Set the common spinloop variable, so all of the secondary cpus
1970 * will block when they are awakened from their OF spinloop.
1971 * This must occur for both SMP and non SMP kernels, since OF will
1972 * be trashed when we move the kernel.
1977 for (node = 0; prom_next_node(&node); ) {
1978 unsigned int cpu_no;
1982 prom_getprop(node, "device_type", type, sizeof(type));
1983 if (strcmp(type, "cpu") != 0)
1986 /* Skip non-configured cpus. */
1987 if (prom_getprop(node, "status", type, sizeof(type)) > 0)
1988 if (strcmp(type, "okay") != 0)
1991 reg = cpu_to_be32(-1); /* make sparse happy */
1992 prom_getprop(node, "reg", ®, sizeof(reg));
1993 cpu_no = be32_to_cpu(reg);
1995 prom_debug("cpu hw idx = %u\n", cpu_no);
1997 /* Init the acknowledge var which will be reset by
1998 * the secondary cpu when it awakens from its OF
2001 *acknowledge = (unsigned long)-1;
2003 if (cpu_no != prom.cpu) {
2004 /* Primary Thread of non-boot cpu or any thread */
2005 prom_printf("starting cpu hw idx %u... ", cpu_no);
2006 call_prom("start-cpu", 3, 0, node,
2007 secondary_hold, cpu_no);
2009 for (i = 0; (i < 100000000) &&
2010 (*acknowledge == ((unsigned long)-1)); i++ )
2013 if (*acknowledge == cpu_no)
2014 prom_printf("done\n");
2016 prom_printf("failed: %lx\n", *acknowledge);
2020 prom_printf("boot cpu hw idx %u\n", cpu_no);
2021 #endif /* CONFIG_SMP */
2024 prom_debug("prom_hold_cpus: end...\n");
2028 static void __init prom_init_client_services(unsigned long pp)
2030 /* Get a handle to the prom entry point before anything else */
2033 /* get a handle for the stdout device */
2034 prom.chosen = call_prom("finddevice", 1, 1, ADDR("/chosen"));
2035 if (!PHANDLE_VALID(prom.chosen))
2036 prom_panic("cannot find chosen"); /* msg won't be printed :( */
2038 /* get device tree root */
2039 prom.root = call_prom("finddevice", 1, 1, ADDR("/"));
2040 if (!PHANDLE_VALID(prom.root))
2041 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
2048 * For really old powermacs, we need to map things we claim.
2049 * For that, we need the ihandle of the mmu.
2050 * Also, on the longtrail, we need to work around other bugs.
2052 static void __init prom_find_mmu(void)
2057 oprom = call_prom("finddevice", 1, 1, ADDR("/openprom"));
2058 if (!PHANDLE_VALID(oprom))
2060 if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0)
2062 version[sizeof(version) - 1] = 0;
2063 /* XXX might need to add other versions here */
2064 if (strcmp(version, "Open Firmware, 1.0.5") == 0)
2065 of_workarounds = OF_WA_CLAIM;
2066 else if (strncmp(version, "FirmWorks,3.", 12) == 0) {
2067 of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL;
2068 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
2071 prom.memory = call_prom("open", 1, 1, ADDR("/memory"));
2072 prom_getprop(prom.chosen, "mmu", &prom.mmumap,
2073 sizeof(prom.mmumap));
2074 prom.mmumap = be32_to_cpu(prom.mmumap);
2075 if (!IHANDLE_VALID(prom.memory) || !IHANDLE_VALID(prom.mmumap))
2076 of_workarounds &= ~OF_WA_CLAIM; /* hmmm */
2079 #define prom_find_mmu()
2082 static void __init prom_init_stdout(void)
2084 char *path = of_stdout_device;
2086 phandle stdout_node;
2089 if (prom_getprop(prom.chosen, "stdout", &val, sizeof(val)) <= 0)
2090 prom_panic("cannot find stdout");
2092 prom.stdout = be32_to_cpu(val);
2094 /* Get the full OF pathname of the stdout device */
2095 memset(path, 0, 256);
2096 call_prom("instance-to-path", 3, 1, prom.stdout, path, 255);
2097 prom_printf("OF stdout device is: %s\n", of_stdout_device);
2098 prom_setprop(prom.chosen, "/chosen", "linux,stdout-path",
2099 path, strlen(path) + 1);
2101 /* instance-to-package fails on PA-Semi */
2102 stdout_node = call_prom("instance-to-package", 1, 1, prom.stdout);
2103 if (stdout_node != PROM_ERROR) {
2104 val = cpu_to_be32(stdout_node);
2105 prom_setprop(prom.chosen, "/chosen", "linux,stdout-package",
2108 /* If it's a display, note it */
2109 memset(type, 0, sizeof(type));
2110 prom_getprop(stdout_node, "device_type", type, sizeof(type));
2111 if (strcmp(type, "display") == 0)
2112 prom_setprop(stdout_node, path, "linux,boot-display", NULL, 0);
2116 static int __init prom_find_machine_type(void)
2125 /* Look for a PowerMac or a Cell */
2126 len = prom_getprop(prom.root, "compatible",
2127 compat, sizeof(compat)-1);
2131 char *p = &compat[i];
2135 if (strstr(p, "Power Macintosh") ||
2136 strstr(p, "MacRISC"))
2137 return PLATFORM_POWERMAC;
2139 /* We must make sure we don't detect the IBM Cell
2140 * blades as pSeries due to some firmware issues,
2143 if (strstr(p, "IBM,CBEA") ||
2144 strstr(p, "IBM,CPBW-1.0"))
2145 return PLATFORM_GENERIC;
2146 #endif /* CONFIG_PPC64 */
2151 /* Try to detect OPAL */
2152 if (PHANDLE_VALID(call_prom("finddevice", 1, 1, ADDR("/ibm,opal"))))
2153 return PLATFORM_OPAL;
2155 /* Try to figure out if it's an IBM pSeries or any other
2156 * PAPR compliant platform. We assume it is if :
2157 * - /device_type is "chrp" (please, do NOT use that for future
2161 len = prom_getprop(prom.root, "device_type",
2162 compat, sizeof(compat)-1);
2164 return PLATFORM_GENERIC;
2165 if (strcmp(compat, "chrp"))
2166 return PLATFORM_GENERIC;
2168 /* Default to pSeries. We need to know if we are running LPAR */
2169 rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
2170 if (!PHANDLE_VALID(rtas))
2171 return PLATFORM_GENERIC;
2172 x = prom_getproplen(rtas, "ibm,hypertas-functions");
2173 if (x != PROM_ERROR) {
2174 prom_debug("Hypertas detected, assuming LPAR !\n");
2175 return PLATFORM_PSERIES_LPAR;
2177 return PLATFORM_PSERIES;
2179 return PLATFORM_GENERIC;
2183 static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
2185 return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);
2189 * If we have a display that we don't know how to drive,
2190 * we will want to try to execute OF's open method for it
2191 * later. However, OF will probably fall over if we do that
2192 * we've taken over the MMU.
2193 * So we check whether we will need to open the display,
2194 * and if so, open it now.
2196 static void __init prom_check_displays(void)
2198 char type[16], *path;
2203 static unsigned char default_colors[] = {
2221 const unsigned char *clut;
2223 prom_debug("Looking for displays\n");
2224 for (node = 0; prom_next_node(&node); ) {
2225 memset(type, 0, sizeof(type));
2226 prom_getprop(node, "device_type", type, sizeof(type));
2227 if (strcmp(type, "display") != 0)
2230 /* It seems OF doesn't null-terminate the path :-( */
2231 path = prom_scratch;
2232 memset(path, 0, PROM_SCRATCH_SIZE);
2235 * leave some room at the end of the path for appending extra
2238 if (call_prom("package-to-path", 3, 1, node, path,
2239 PROM_SCRATCH_SIZE-10) == PROM_ERROR)
2241 prom_printf("found display : %s, opening... ", path);
2243 ih = call_prom("open", 1, 1, path);
2245 prom_printf("failed\n");
2250 prom_printf("done\n");
2251 prom_setprop(node, path, "linux,opened", NULL, 0);
2253 /* Setup a usable color table when the appropriate
2254 * method is available. Should update this to set-colors */
2255 clut = default_colors;
2256 for (i = 0; i < 16; i++, clut += 3)
2257 if (prom_set_color(ih, i, clut[0], clut[1],
2261 #ifdef CONFIG_LOGO_LINUX_CLUT224
2262 clut = PTRRELOC(logo_linux_clut224.clut);
2263 for (i = 0; i < logo_linux_clut224.clutsize; i++, clut += 3)
2264 if (prom_set_color(ih, i + 32, clut[0], clut[1],
2267 #endif /* CONFIG_LOGO_LINUX_CLUT224 */
2269 #ifdef CONFIG_PPC_EARLY_DEBUG_BOOTX
2270 if (prom_getprop(node, "linux,boot-display", NULL, 0) !=
2272 u32 width, height, pitch, addr;
2274 prom_printf("Setting btext !\n");
2275 prom_getprop(node, "width", &width, 4);
2276 prom_getprop(node, "height", &height, 4);
2277 prom_getprop(node, "linebytes", &pitch, 4);
2278 prom_getprop(node, "address", &addr, 4);
2279 prom_printf("W=%d H=%d LB=%d addr=0x%x\n",
2280 width, height, pitch, addr);
2281 btext_setup_display(width, height, 8, pitch, addr);
2283 #endif /* CONFIG_PPC_EARLY_DEBUG_BOOTX */
2288 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */
2289 static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end,
2290 unsigned long needed, unsigned long align)
2294 *mem_start = _ALIGN(*mem_start, align);
2295 while ((*mem_start + needed) > *mem_end) {
2296 unsigned long room, chunk;
2298 prom_debug("Chunk exhausted, claiming more at %lx...\n",
2300 room = alloc_top - alloc_bottom;
2301 if (room > DEVTREE_CHUNK_SIZE)
2302 room = DEVTREE_CHUNK_SIZE;
2303 if (room < PAGE_SIZE)
2304 prom_panic("No memory for flatten_device_tree "
2306 chunk = alloc_up(room, 0);
2308 prom_panic("No memory for flatten_device_tree "
2309 "(claim failed)\n");
2310 *mem_end = chunk + room;
2313 ret = (void *)*mem_start;
2314 *mem_start += needed;
2319 #define dt_push_token(token, mem_start, mem_end) do { \
2320 void *room = make_room(mem_start, mem_end, 4, 4); \
2321 *(__be32 *)room = cpu_to_be32(token); \
2324 static unsigned long __init dt_find_string(char *str)
2328 s = os = (char *)dt_string_start;
2330 while (s < (char *)dt_string_end) {
2331 if (strcmp(s, str) == 0)
2339 * The Open Firmware 1275 specification states properties must be 31 bytes or
2340 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
2342 #define MAX_PROPERTY_NAME 64
2344 static void __init scan_dt_build_strings(phandle node,
2345 unsigned long *mem_start,
2346 unsigned long *mem_end)
2348 char *prev_name, *namep, *sstart;
2352 sstart = (char *)dt_string_start;
2354 /* get and store all property names */
2357 /* 64 is max len of name including nul. */
2358 namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1);
2359 if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) {
2360 /* No more nodes: unwind alloc */
2361 *mem_start = (unsigned long)namep;
2366 if (strcmp(namep, "name") == 0) {
2367 *mem_start = (unsigned long)namep;
2371 /* get/create string entry */
2372 soff = dt_find_string(namep);
2374 *mem_start = (unsigned long)namep;
2375 namep = sstart + soff;
2377 /* Trim off some if we can */
2378 *mem_start = (unsigned long)namep + strlen(namep) + 1;
2379 dt_string_end = *mem_start;
2384 /* do all our children */
2385 child = call_prom("child", 1, 1, node);
2386 while (child != 0) {
2387 scan_dt_build_strings(child, mem_start, mem_end);
2388 child = call_prom("peer", 1, 1, child);
2392 static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
2393 unsigned long *mem_end)
2396 char *namep, *prev_name, *sstart, *p, *ep, *lp, *path;
2398 unsigned char *valp;
2399 static char pname[MAX_PROPERTY_NAME];
2400 int l, room, has_phandle = 0;
2402 dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);
2404 /* get the node's full name */
2405 namep = (char *)*mem_start;
2406 room = *mem_end - *mem_start;
2409 l = call_prom("package-to-path", 3, 1, node, namep, room);
2411 /* Didn't fit? Get more room. */
2413 if (l >= *mem_end - *mem_start)
2414 namep = make_room(mem_start, mem_end, l+1, 1);
2415 call_prom("package-to-path", 3, 1, node, namep, l);
2419 /* Fixup an Apple bug where they have bogus \0 chars in the
2420 * middle of the path in some properties, and extract
2421 * the unit name (everything after the last '/').
2423 for (lp = p = namep, ep = namep + l; p < ep; p++) {
2430 *mem_start = _ALIGN((unsigned long)lp + 1, 4);
2433 /* get it again for debugging */
2434 path = prom_scratch;
2435 memset(path, 0, PROM_SCRATCH_SIZE);
2436 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
2438 /* get and store all properties */
2440 sstart = (char *)dt_string_start;
2442 if (call_prom("nextprop", 3, 1, node, prev_name,
2447 if (strcmp(pname, "name") == 0) {
2452 /* find string offset */
2453 soff = dt_find_string(pname);
2455 prom_printf("WARNING: Can't find string index for"
2456 " <%s>, node %s\n", pname, path);
2459 prev_name = sstart + soff;
2462 l = call_prom("getproplen", 2, 1, node, pname);
2465 if (l == PROM_ERROR)
2468 /* push property head */
2469 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2470 dt_push_token(l, mem_start, mem_end);
2471 dt_push_token(soff, mem_start, mem_end);
2473 /* push property content */
2474 valp = make_room(mem_start, mem_end, l, 4);
2475 call_prom("getprop", 4, 1, node, pname, valp, l);
2476 *mem_start = _ALIGN(*mem_start, 4);
2478 if (!strcmp(pname, "phandle"))
2482 /* Add a "linux,phandle" property if no "phandle" property already
2483 * existed (can happen with OPAL)
2486 soff = dt_find_string("linux,phandle");
2488 prom_printf("WARNING: Can't find string index for"
2489 " <linux-phandle> node %s\n", path);
2491 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2492 dt_push_token(4, mem_start, mem_end);
2493 dt_push_token(soff, mem_start, mem_end);
2494 valp = make_room(mem_start, mem_end, 4, 4);
2495 *(__be32 *)valp = cpu_to_be32(node);
2499 /* do all our children */
2500 child = call_prom("child", 1, 1, node);
2501 while (child != 0) {
2502 scan_dt_build_struct(child, mem_start, mem_end);
2503 child = call_prom("peer", 1, 1, child);
2506 dt_push_token(OF_DT_END_NODE, mem_start, mem_end);
2509 static void __init flatten_device_tree(void)
2512 unsigned long mem_start, mem_end, room;
2513 struct boot_param_header *hdr;
2518 * Check how much room we have between alloc top & bottom (+/- a
2519 * few pages), crop to 1MB, as this is our "chunk" size
2521 room = alloc_top - alloc_bottom - 0x4000;
2522 if (room > DEVTREE_CHUNK_SIZE)
2523 room = DEVTREE_CHUNK_SIZE;
2524 prom_debug("starting device tree allocs at %lx\n", alloc_bottom);
2526 /* Now try to claim that */
2527 mem_start = (unsigned long)alloc_up(room, PAGE_SIZE);
2529 prom_panic("Can't allocate initial device-tree chunk\n");
2530 mem_end = mem_start + room;
2532 /* Get root of tree */
2533 root = call_prom("peer", 1, 1, (phandle)0);
2534 if (root == (phandle)0)
2535 prom_panic ("couldn't get device tree root\n");
2537 /* Build header and make room for mem rsv map */
2538 mem_start = _ALIGN(mem_start, 4);
2539 hdr = make_room(&mem_start, &mem_end,
2540 sizeof(struct boot_param_header), 4);
2541 dt_header_start = (unsigned long)hdr;
2542 rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8);
2544 /* Start of strings */
2545 mem_start = PAGE_ALIGN(mem_start);
2546 dt_string_start = mem_start;
2547 mem_start += 4; /* hole */
2549 /* Add "linux,phandle" in there, we'll need it */
2550 namep = make_room(&mem_start, &mem_end, 16, 1);
2551 strcpy(namep, "linux,phandle");
2552 mem_start = (unsigned long)namep + strlen(namep) + 1;
2554 /* Build string array */
2555 prom_printf("Building dt strings...\n");
2556 scan_dt_build_strings(root, &mem_start, &mem_end);
2557 dt_string_end = mem_start;
2559 /* Build structure */
2560 mem_start = PAGE_ALIGN(mem_start);
2561 dt_struct_start = mem_start;
2562 prom_printf("Building dt structure...\n");
2563 scan_dt_build_struct(root, &mem_start, &mem_end);
2564 dt_push_token(OF_DT_END, &mem_start, &mem_end);
2565 dt_struct_end = PAGE_ALIGN(mem_start);
2568 hdr->boot_cpuid_phys = cpu_to_be32(prom.cpu);
2569 hdr->magic = cpu_to_be32(OF_DT_HEADER);
2570 hdr->totalsize = cpu_to_be32(dt_struct_end - dt_header_start);
2571 hdr->off_dt_struct = cpu_to_be32(dt_struct_start - dt_header_start);
2572 hdr->off_dt_strings = cpu_to_be32(dt_string_start - dt_header_start);
2573 hdr->dt_strings_size = cpu_to_be32(dt_string_end - dt_string_start);
2574 hdr->off_mem_rsvmap = cpu_to_be32(((unsigned long)rsvmap) - dt_header_start);
2575 hdr->version = cpu_to_be32(OF_DT_VERSION);
2576 /* Version 16 is not backward compatible */
2577 hdr->last_comp_version = cpu_to_be32(0x10);
2579 /* Copy the reserve map in */
2580 memcpy(rsvmap, mem_reserve_map, sizeof(mem_reserve_map));
2585 prom_printf("reserved memory map:\n");
2586 for (i = 0; i < mem_reserve_cnt; i++)
2587 prom_printf(" %llx - %llx\n",
2588 be64_to_cpu(mem_reserve_map[i].base),
2589 be64_to_cpu(mem_reserve_map[i].size));
2592 /* Bump mem_reserve_cnt to cause further reservations to fail
2593 * since it's too late.
2595 mem_reserve_cnt = MEM_RESERVE_MAP_SIZE;
2597 prom_printf("Device tree strings 0x%lx -> 0x%lx\n",
2598 dt_string_start, dt_string_end);
2599 prom_printf("Device tree struct 0x%lx -> 0x%lx\n",
2600 dt_struct_start, dt_struct_end);
2603 #ifdef CONFIG_PPC_MAPLE
2604 /* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property.
2605 * The values are bad, and it doesn't even have the right number of cells. */
2606 static void __init fixup_device_tree_maple(void)
2609 u32 rloc = 0x01002000; /* IO space; PCI device = 4 */
2613 name = "/ht@0/isa@4";
2614 isa = call_prom("finddevice", 1, 1, ADDR(name));
2615 if (!PHANDLE_VALID(isa)) {
2616 name = "/ht@0/isa@6";
2617 isa = call_prom("finddevice", 1, 1, ADDR(name));
2618 rloc = 0x01003000; /* IO space; PCI device = 6 */
2620 if (!PHANDLE_VALID(isa))
2623 if (prom_getproplen(isa, "ranges") != 12)
2625 if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges))
2629 if (isa_ranges[0] != 0x1 ||
2630 isa_ranges[1] != 0xf4000000 ||
2631 isa_ranges[2] != 0x00010000)
2634 prom_printf("Fixing up bogus ISA range on Maple/Apache...\n");
2636 isa_ranges[0] = 0x1;
2637 isa_ranges[1] = 0x0;
2638 isa_ranges[2] = rloc;
2639 isa_ranges[3] = 0x0;
2640 isa_ranges[4] = 0x0;
2641 isa_ranges[5] = 0x00010000;
2642 prom_setprop(isa, name, "ranges",
2643 isa_ranges, sizeof(isa_ranges));
2646 #define CPC925_MC_START 0xf8000000
2647 #define CPC925_MC_LENGTH 0x1000000
2648 /* The values for memory-controller don't have right number of cells */
2649 static void __init fixup_device_tree_maple_memory_controller(void)
2653 char *name = "/hostbridge@f8000000";
2656 mc = call_prom("finddevice", 1, 1, ADDR(name));
2657 if (!PHANDLE_VALID(mc))
2660 if (prom_getproplen(mc, "reg") != 8)
2663 prom_getprop(prom.root, "#address-cells", &ac, sizeof(ac));
2664 prom_getprop(prom.root, "#size-cells", &sc, sizeof(sc));
2665 if ((ac != 2) || (sc != 2))
2668 if (prom_getprop(mc, "reg", mc_reg, sizeof(mc_reg)) == PROM_ERROR)
2671 if (mc_reg[0] != CPC925_MC_START || mc_reg[1] != CPC925_MC_LENGTH)
2674 prom_printf("Fixing up bogus hostbridge on Maple...\n");
2677 mc_reg[1] = CPC925_MC_START;
2679 mc_reg[3] = CPC925_MC_LENGTH;
2680 prom_setprop(mc, name, "reg", mc_reg, sizeof(mc_reg));
2683 #define fixup_device_tree_maple()
2684 #define fixup_device_tree_maple_memory_controller()
2687 #ifdef CONFIG_PPC_CHRP
2689 * Pegasos and BriQ lacks the "ranges" property in the isa node
2690 * Pegasos needs decimal IRQ 14/15, not hexadecimal
2691 * Pegasos has the IDE configured in legacy mode, but advertised as native
2693 static void __init fixup_device_tree_chrp(void)
2697 u32 rloc = 0x01006000; /* IO space; PCI device = 12 */
2701 name = "/pci@80000000/isa@c";
2702 ph = call_prom("finddevice", 1, 1, ADDR(name));
2703 if (!PHANDLE_VALID(ph)) {
2704 name = "/pci@ff500000/isa@6";
2705 ph = call_prom("finddevice", 1, 1, ADDR(name));
2706 rloc = 0x01003000; /* IO space; PCI device = 6 */
2708 if (PHANDLE_VALID(ph)) {
2709 rc = prom_getproplen(ph, "ranges");
2710 if (rc == 0 || rc == PROM_ERROR) {
2711 prom_printf("Fixing up missing ISA range on Pegasos...\n");
2718 prop[5] = 0x00010000;
2719 prom_setprop(ph, name, "ranges", prop, sizeof(prop));
2723 name = "/pci@80000000/ide@C,1";
2724 ph = call_prom("finddevice", 1, 1, ADDR(name));
2725 if (PHANDLE_VALID(ph)) {
2726 prom_printf("Fixing up IDE interrupt on Pegasos...\n");
2729 prom_setprop(ph, name, "interrupts", prop, 2*sizeof(u32));
2730 prom_printf("Fixing up IDE class-code on Pegasos...\n");
2731 rc = prom_getprop(ph, "class-code", prop, sizeof(u32));
2732 if (rc == sizeof(u32)) {
2734 prom_setprop(ph, name, "class-code", prop, sizeof(u32));
2739 #define fixup_device_tree_chrp()
2742 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
2743 static void __init fixup_device_tree_pmac(void)
2745 phandle u3, i2c, mpic;
2750 /* Some G5s have a missing interrupt definition, fix it up here */
2751 u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
2752 if (!PHANDLE_VALID(u3))
2754 i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
2755 if (!PHANDLE_VALID(i2c))
2757 mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
2758 if (!PHANDLE_VALID(mpic))
2761 /* check if proper rev of u3 */
2762 if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev))
2765 if (u3_rev < 0x35 || u3_rev > 0x39)
2767 /* does it need fixup ? */
2768 if (prom_getproplen(i2c, "interrupts") > 0)
2771 prom_printf("fixing up bogus interrupts for u3 i2c...\n");
2773 /* interrupt on this revision of u3 is number 0 and level */
2776 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts",
2777 &interrupts, sizeof(interrupts));
2779 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
2780 &parent, sizeof(parent));
2783 #define fixup_device_tree_pmac()
2786 #ifdef CONFIG_PPC_EFIKA
2788 * The MPC5200 FEC driver requires an phy-handle property to tell it how
2789 * to talk to the phy. If the phy-handle property is missing, then this
2790 * function is called to add the appropriate nodes and link it to the
2793 static void __init fixup_device_tree_efika_add_phy(void)
2799 /* Check if /builtin/ethernet exists - bail if it doesn't */
2800 node = call_prom("finddevice", 1, 1, ADDR("/builtin/ethernet"));
2801 if (!PHANDLE_VALID(node))
2804 /* Check if the phy-handle property exists - bail if it does */
2805 rv = prom_getprop(node, "phy-handle", prop, sizeof(prop));
2810 * At this point the ethernet device doesn't have a phy described.
2811 * Now we need to add the missing phy node and linkage
2814 /* Check for an MDIO bus node - if missing then create one */
2815 node = call_prom("finddevice", 1, 1, ADDR("/builtin/mdio"));
2816 if (!PHANDLE_VALID(node)) {
2817 prom_printf("Adding Ethernet MDIO node\n");
2818 call_prom("interpret", 1, 1,
2819 " s\" /builtin\" find-device"
2821 " 1 encode-int s\" #address-cells\" property"
2822 " 0 encode-int s\" #size-cells\" property"
2823 " s\" mdio\" device-name"
2824 " s\" fsl,mpc5200b-mdio\" encode-string"
2825 " s\" compatible\" property"
2826 " 0xf0003000 0x400 reg"
2828 " 0x5 encode-int encode+"
2829 " 0x3 encode-int encode+"
2830 " s\" interrupts\" property"
2834 /* Check for a PHY device node - if missing then create one and
2835 * give it's phandle to the ethernet node */
2836 node = call_prom("finddevice", 1, 1,
2837 ADDR("/builtin/mdio/ethernet-phy"));
2838 if (!PHANDLE_VALID(node)) {
2839 prom_printf("Adding Ethernet PHY node\n");
2840 call_prom("interpret", 1, 1,
2841 " s\" /builtin/mdio\" find-device"
2843 " s\" ethernet-phy\" device-name"
2844 " 0x10 encode-int s\" reg\" property"
2848 " s\" /builtin/ethernet\" find-device"
2850 " s\" phy-handle\" property"
2855 static void __init fixup_device_tree_efika(void)
2857 int sound_irq[3] = { 2, 2, 0 };
2858 int bcomm_irq[3*16] = { 3,0,0, 3,1,0, 3,2,0, 3,3,0,
2859 3,4,0, 3,5,0, 3,6,0, 3,7,0,
2860 3,8,0, 3,9,0, 3,10,0, 3,11,0,
2861 3,12,0, 3,13,0, 3,14,0, 3,15,0 };
2866 /* Check if we're really running on a EFIKA */
2867 node = call_prom("finddevice", 1, 1, ADDR("/"));
2868 if (!PHANDLE_VALID(node))
2871 rv = prom_getprop(node, "model", prop, sizeof(prop));
2872 if (rv == PROM_ERROR)
2874 if (strcmp(prop, "EFIKA5K2"))
2877 prom_printf("Applying EFIKA device tree fixups\n");
2879 /* Claiming to be 'chrp' is death */
2880 node = call_prom("finddevice", 1, 1, ADDR("/"));
2881 rv = prom_getprop(node, "device_type", prop, sizeof(prop));
2882 if (rv != PROM_ERROR && (strcmp(prop, "chrp") == 0))
2883 prom_setprop(node, "/", "device_type", "efika", sizeof("efika"));
2885 /* CODEGEN,description is exposed in /proc/cpuinfo so
2887 rv = prom_getprop(node, "CODEGEN,description", prop, sizeof(prop));
2888 if (rv != PROM_ERROR && (strstr(prop, "CHRP")))
2889 prom_setprop(node, "/", "CODEGEN,description",
2890 "Efika 5200B PowerPC System",
2891 sizeof("Efika 5200B PowerPC System"));
2893 /* Fixup bestcomm interrupts property */
2894 node = call_prom("finddevice", 1, 1, ADDR("/builtin/bestcomm"));
2895 if (PHANDLE_VALID(node)) {
2896 len = prom_getproplen(node, "interrupts");
2898 prom_printf("Fixing bestcomm interrupts property\n");
2899 prom_setprop(node, "/builtin/bestcom", "interrupts",
2900 bcomm_irq, sizeof(bcomm_irq));
2904 /* Fixup sound interrupts property */
2905 node = call_prom("finddevice", 1, 1, ADDR("/builtin/sound"));
2906 if (PHANDLE_VALID(node)) {
2907 rv = prom_getprop(node, "interrupts", prop, sizeof(prop));
2908 if (rv == PROM_ERROR) {
2909 prom_printf("Adding sound interrupts property\n");
2910 prom_setprop(node, "/builtin/sound", "interrupts",
2911 sound_irq, sizeof(sound_irq));
2915 /* Make sure ethernet phy-handle property exists */
2916 fixup_device_tree_efika_add_phy();
2919 #define fixup_device_tree_efika()
2922 #ifdef CONFIG_PPC_PASEMI_NEMO
2924 * CFE supplied on Nemo is broken in several ways, biggest
2925 * problem is that it reassigns ISA interrupts to unused mpic ints.
2926 * Add an interrupt-controller property for the io-bridge to use
2927 * and correct the ints so we can attach them to an irq_domain
2929 static void __init fixup_device_tree_pasemi(void)
2931 u32 interrupts[2], parent, rval, val = 0;
2932 char *name, *pci_name;
2935 /* Find the root pci node */
2936 name = "/pxp@0,e0000000";
2937 iob = call_prom("finddevice", 1, 1, ADDR(name));
2938 if (!PHANDLE_VALID(iob))
2941 /* check if interrupt-controller node set yet */
2942 if (prom_getproplen(iob, "interrupt-controller") !=PROM_ERROR)
2945 prom_printf("adding interrupt-controller property for SB600...\n");
2947 prom_setprop(iob, name, "interrupt-controller", &val, 0);
2949 pci_name = "/pxp@0,e0000000/pci@11";
2950 node = call_prom("finddevice", 1, 1, ADDR(pci_name));
2953 for( ; prom_next_node(&node); ) {
2954 /* scan each node for one with an interrupt */
2955 if (!PHANDLE_VALID(node))
2958 rval = prom_getproplen(node, "interrupts");
2959 if (rval == 0 || rval == PROM_ERROR)
2962 prom_getprop(node, "interrupts", &interrupts, sizeof(interrupts));
2963 if ((interrupts[0] < 212) || (interrupts[0] > 222))
2966 /* found a node, update both interrupts and interrupt-parent */
2967 if ((interrupts[0] >= 212) && (interrupts[0] <= 215))
2968 interrupts[0] -= 203;
2969 if ((interrupts[0] >= 216) && (interrupts[0] <= 220))
2970 interrupts[0] -= 213;
2971 if (interrupts[0] == 221)
2973 if (interrupts[0] == 222)
2976 prom_setprop(node, pci_name, "interrupts", interrupts,
2977 sizeof(interrupts));
2978 prom_setprop(node, pci_name, "interrupt-parent", &parent,
2983 * The io-bridge has device_type set to 'io-bridge' change it to 'isa'
2984 * so that generic isa-bridge code can add the SB600 and its on-board
2987 name = "/pxp@0,e0000000/io-bridge@0";
2988 iob = call_prom("finddevice", 1, 1, ADDR(name));
2989 if (!PHANDLE_VALID(iob))
2992 /* device_type is already set, just change it. */
2994 prom_printf("Changing device_type of SB600 node...\n");
2996 prom_setprop(iob, name, "device_type", "isa", sizeof("isa"));
2998 #else /* !CONFIG_PPC_PASEMI_NEMO */
2999 static inline void fixup_device_tree_pasemi(void) { }
3002 static void __init fixup_device_tree(void)
3004 fixup_device_tree_maple();
3005 fixup_device_tree_maple_memory_controller();
3006 fixup_device_tree_chrp();
3007 fixup_device_tree_pmac();
3008 fixup_device_tree_efika();
3009 fixup_device_tree_pasemi();
3012 static void __init prom_find_boot_cpu(void)
3019 if (prom_getprop(prom.chosen, "cpu", &rval, sizeof(rval)) <= 0)
3021 prom_cpu = be32_to_cpu(rval);
3023 cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);
3025 if (!PHANDLE_VALID(cpu_pkg))
3028 prom_getprop(cpu_pkg, "reg", &rval, sizeof(rval));
3029 prom.cpu = be32_to_cpu(rval);
3031 prom_debug("Booting CPU hw index = %d\n", prom.cpu);
3034 static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
3036 #ifdef CONFIG_BLK_DEV_INITRD
3037 if (r3 && r4 && r4 != 0xdeadbeef) {
3040 prom_initrd_start = is_kernel_addr(r3) ? __pa(r3) : r3;
3041 prom_initrd_end = prom_initrd_start + r4;
3043 val = cpu_to_be64(prom_initrd_start);
3044 prom_setprop(prom.chosen, "/chosen", "linux,initrd-start",
3046 val = cpu_to_be64(prom_initrd_end);
3047 prom_setprop(prom.chosen, "/chosen", "linux,initrd-end",
3050 reserve_mem(prom_initrd_start,
3051 prom_initrd_end - prom_initrd_start);
3053 prom_debug("initrd_start=0x%lx\n", prom_initrd_start);
3054 prom_debug("initrd_end=0x%lx\n", prom_initrd_end);
3056 #endif /* CONFIG_BLK_DEV_INITRD */
3060 #ifdef CONFIG_RELOCATABLE
3061 static void reloc_toc(void)
3065 static void unreloc_toc(void)
3069 static void __reloc_toc(unsigned long offset, unsigned long nr_entries)
3072 unsigned long *toc_entry;
3074 /* Get the start of the TOC by using r2 directly. */
3075 asm volatile("addi %0,2,-0x8000" : "=b" (toc_entry));
3077 for (i = 0; i < nr_entries; i++) {
3078 *toc_entry = *toc_entry + offset;
3083 static void reloc_toc(void)
3085 unsigned long offset = reloc_offset();
3086 unsigned long nr_entries =
3087 (__prom_init_toc_end - __prom_init_toc_start) / sizeof(long);
3089 __reloc_toc(offset, nr_entries);
3094 static void unreloc_toc(void)
3096 unsigned long offset = reloc_offset();
3097 unsigned long nr_entries =
3098 (__prom_init_toc_end - __prom_init_toc_start) / sizeof(long);
3102 __reloc_toc(-offset, nr_entries);
3108 * We enter here early on, when the Open Firmware prom is still
3109 * handling exceptions and the MMU hash table for us.
3112 unsigned long __init prom_init(unsigned long r3, unsigned long r4,
3114 unsigned long r6, unsigned long r7,
3115 unsigned long kbase)
3120 unsigned long offset = reloc_offset();
3127 * First zero the BSS
3129 memset(&__bss_start, 0, __bss_stop - __bss_start);
3132 * Init interface to Open Firmware, get some node references,
3135 prom_init_client_services(pp);
3138 * See if this OF is old enough that we need to do explicit maps
3139 * and other workarounds
3144 * Init prom stdout device
3148 prom_printf("Preparing to boot %s", linux_banner);
3151 * Get default machine type. At this point, we do not differentiate
3152 * between pSeries SMP and pSeries LPAR
3154 of_platform = prom_find_machine_type();
3155 prom_printf("Detected machine type: %x\n", of_platform);
3157 #ifndef CONFIG_NONSTATIC_KERNEL
3158 /* Bail if this is a kdump kernel. */
3159 if (PHYSICAL_START > 0)
3160 prom_panic("Error: You can't boot a kdump kernel from OF!\n");
3164 * Check for an initrd
3166 prom_check_initrd(r3, r4);
3169 * Do early parsing of command line
3171 early_cmdline_parse();
3173 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
3175 * On pSeries, inform the firmware about our capabilities
3177 if (of_platform == PLATFORM_PSERIES ||
3178 of_platform == PLATFORM_PSERIES_LPAR)
3179 prom_send_capabilities();
3183 * Copy the CPU hold code
3185 if (of_platform != PLATFORM_POWERMAC)
3186 copy_and_flush(0, kbase, 0x100, 0);
3189 * Initialize memory management within prom_init
3194 * Determine which cpu is actually running right _now_
3196 prom_find_boot_cpu();
3199 * Initialize display devices
3201 prom_check_displays();
3203 #if defined(CONFIG_PPC64) && defined(__BIG_ENDIAN__)
3205 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
3206 * that uses the allocator, we need to make sure we get the top of memory
3207 * available for us here...
3209 if (of_platform == PLATFORM_PSERIES)
3210 prom_initialize_tce_table();
3214 * On non-powermacs, try to instantiate RTAS. PowerMacs don't
3215 * have a usable RTAS implementation.
3217 if (of_platform != PLATFORM_POWERMAC &&
3218 of_platform != PLATFORM_OPAL)
3219 prom_instantiate_rtas();
3221 #ifdef CONFIG_PPC_POWERNV
3222 if (of_platform == PLATFORM_OPAL)
3223 prom_instantiate_opal();
3224 #endif /* CONFIG_PPC_POWERNV */
3227 /* instantiate sml */
3228 prom_instantiate_sml();
3232 * On non-powermacs, put all CPUs in spin-loops.
3234 * PowerMacs use a different mechanism to spin CPUs
3236 * (This must be done after instanciating RTAS)
3238 if (of_platform != PLATFORM_POWERMAC &&
3239 of_platform != PLATFORM_OPAL)
3243 * Fill in some infos for use by the kernel later on
3245 if (prom_memory_limit) {
3246 __be64 val = cpu_to_be64(prom_memory_limit);
3247 prom_setprop(prom.chosen, "/chosen", "linux,memory-limit",
3252 prom_setprop(prom.chosen, "/chosen", "linux,iommu-off",
3255 if (prom_iommu_force_on)
3256 prom_setprop(prom.chosen, "/chosen", "linux,iommu-force-on",
3259 if (prom_tce_alloc_start) {
3260 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-start",
3261 &prom_tce_alloc_start,
3262 sizeof(prom_tce_alloc_start));
3263 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-end",
3264 &prom_tce_alloc_end,
3265 sizeof(prom_tce_alloc_end));
3270 * Fixup any known bugs in the device-tree
3272 fixup_device_tree();
3275 * Now finally create the flattened device-tree
3277 prom_printf("copying OF device tree...\n");
3278 flatten_device_tree();
3281 * in case stdin is USB and still active on IBM machines...
3282 * Unfortunately quiesce crashes on some powermacs if we have
3283 * closed stdin already (in particular the powerbook 101). It
3284 * appears that the OPAL version of OFW doesn't like it either.
3286 if (of_platform != PLATFORM_POWERMAC &&
3287 of_platform != PLATFORM_OPAL)
3291 * Call OF "quiesce" method to shut down pending DMA's from
3294 prom_printf("Quiescing Open Firmware ...\n");
3295 call_prom("quiesce", 0, 0);
3298 * And finally, call the kernel passing it the flattened device
3299 * tree and NULL as r5, thus triggering the new entry point which
3300 * is common to us and kexec
3302 hdr = dt_header_start;
3304 /* Don't print anything after quiesce under OPAL, it crashes OFW */
3305 if (of_platform != PLATFORM_OPAL) {
3306 prom_printf("Booting Linux via __start() @ 0x%lx ...\n", kbase);
3307 prom_debug("->dt_header_start=0x%lx\n", hdr);
3311 reloc_got2(-offset);
3316 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
3317 /* OPAL early debug gets the OPAL base & entry in r8 and r9 */
3318 __start(hdr, kbase, 0, 0, 0,
3319 prom_opal_base, prom_opal_entry);
3321 __start(hdr, kbase, 0, 0, 0, 0, 0);