1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Procedures for interfacing to Open Firmware.
5 * Paul Mackerras August 1996.
6 * Copyright (C) 1996-2005 Paul Mackerras.
8 * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
9 * {engebret|bergner}@us.ibm.com
14 /* we cannot use FORTIFY as it brings in new symbols */
17 #include <linux/stdarg.h>
18 #include <linux/kernel.h>
19 #include <linux/string.h>
20 #include <linux/init.h>
21 #include <linux/threads.h>
22 #include <linux/spinlock.h>
23 #include <linux/types.h>
24 #include <linux/pci.h>
25 #include <linux/proc_fs.h>
26 #include <linux/delay.h>
27 #include <linux/initrd.h>
28 #include <linux/bitops.h>
29 #include <linux/pgtable.h>
30 #include <linux/printk.h>
32 #include <linux/of_fdt.h>
36 #include <asm/processor.h>
37 #include <asm/interrupt.h>
42 #include <asm/iommu.h>
43 #include <asm/btext.h>
44 #include <asm/sections.h>
45 #include <asm/machdep.h>
46 #include <asm/asm-prototypes.h>
47 #include <asm/ultravisor-api.h>
49 #include <linux/linux_logo.h>
51 /* All of prom_init bss lives here */
52 #define __prombss __section(".bss.prominit")
55 * Eventually bump that one up
57 #define DEVTREE_CHUNK_SIZE 0x100000
60 * This is the size of the local memory reserve map that gets copied
61 * into the boot params passed to the kernel. That size is totally
62 * flexible as the kernel just reads the list until it encounters an
63 * entry with size 0, so it can be changed without breaking binary
66 #define MEM_RESERVE_MAP_SIZE 8
69 * prom_init() is called very early on, before the kernel text
70 * and data have been mapped to KERNELBASE. At this point the code
71 * is running at whatever address it has been loaded at.
72 * On ppc32 we compile with -mrelocatable, which means that references
73 * to extern and static variables get relocated automatically.
74 * ppc64 objects are always relocatable, we just need to relocate the
77 * Because OF may have mapped I/O devices into the area starting at
78 * KERNELBASE, particularly on CHRP machines, we can't safely call
79 * OF once the kernel has been mapped to KERNELBASE. Therefore all
80 * OF calls must be done within prom_init().
82 * ADDR is used in calls to call_prom. The 4th and following
83 * arguments to call_prom should be 32-bit values.
84 * On ppc64, 64 bit values are truncated to 32 bits (and
85 * fortunately don't get interpreted as two arguments).
87 #define ADDR(x) (u32)(unsigned long)(x)
90 #define OF_WORKAROUNDS 0
92 #define OF_WORKAROUNDS of_workarounds
93 static int of_workarounds __prombss;
96 #define OF_WA_CLAIM 1 /* do phys/virt claim separately, then map */
97 #define OF_WA_LONGTRAIL 2 /* work around longtrail bugs */
99 #define PROM_BUG() do { \
100 prom_printf("kernel BUG at %s line 0x%x!\n", \
101 __FILE__, __LINE__); \
106 #define prom_debug(x...) prom_printf(x)
108 #define prom_debug(x...) do { } while (0)
112 typedef u32 prom_arg_t;
130 struct mem_map_entry {
135 typedef __be32 cell_t;
137 extern void __start(unsigned long r3, unsigned long r4, unsigned long r5,
138 unsigned long r6, unsigned long r7, unsigned long r8,
142 extern int enter_prom(struct prom_args *args, unsigned long entry);
144 static inline int enter_prom(struct prom_args *args, unsigned long entry)
146 return ((int (*)(struct prom_args *))entry)(args);
150 extern void copy_and_flush(unsigned long dest, unsigned long src,
151 unsigned long size, unsigned long offset);
154 static struct prom_t __prombss prom;
156 static unsigned long __prombss prom_entry;
158 static char __prombss of_stdout_device[256];
159 static char __prombss prom_scratch[256];
161 static unsigned long __prombss dt_header_start;
162 static unsigned long __prombss dt_struct_start, dt_struct_end;
163 static unsigned long __prombss dt_string_start, dt_string_end;
165 static unsigned long __prombss prom_initrd_start, prom_initrd_end;
168 static int __prombss prom_iommu_force_on;
169 static int __prombss prom_iommu_off;
170 static unsigned long __prombss prom_tce_alloc_start;
171 static unsigned long __prombss prom_tce_alloc_end;
174 #ifdef CONFIG_PPC_PSERIES
175 static bool __prombss prom_radix_disable;
176 static bool __prombss prom_radix_gtse_disable;
177 static bool __prombss prom_xive_disable;
180 #ifdef CONFIG_PPC_SVM
181 static bool __prombss prom_svm_enable;
184 struct platform_support {
191 /* Platforms codes are now obsolete in the kernel. Now only used within this
192 * file and ultimately gone too. Feel free to change them if you need, they
193 * are not shared with anything outside of this file anymore
195 #define PLATFORM_PSERIES 0x0100
196 #define PLATFORM_PSERIES_LPAR 0x0101
197 #define PLATFORM_LPAR 0x0001
198 #define PLATFORM_POWERMAC 0x0400
199 #define PLATFORM_GENERIC 0x0500
201 static int __prombss of_platform;
203 static char __prombss prom_cmd_line[COMMAND_LINE_SIZE];
205 static unsigned long __prombss prom_memory_limit;
207 static unsigned long __prombss alloc_top;
208 static unsigned long __prombss alloc_top_high;
209 static unsigned long __prombss alloc_bottom;
210 static unsigned long __prombss rmo_top;
211 static unsigned long __prombss ram_top;
213 static struct mem_map_entry __prombss mem_reserve_map[MEM_RESERVE_MAP_SIZE];
214 static int __prombss mem_reserve_cnt;
216 static cell_t __prombss regbuf[1024];
218 static bool __prombss rtas_has_query_cpu_stopped;
222 * Error results ... some OF calls will return "-1" on error, some
223 * will return 0, some will return either. To simplify, here are
224 * macros to use with any ihandle or phandle return value to check if
228 #define PROM_ERROR (-1u)
229 #define PHANDLE_VALID(p) ((p) != 0 && (p) != PROM_ERROR)
230 #define IHANDLE_VALID(i) ((i) != 0 && (i) != PROM_ERROR)
232 /* Copied from lib/string.c and lib/kstrtox.c */
234 static int __init prom_strcmp(const char *cs, const char *ct)
236 unsigned char c1, c2;
242 return c1 < c2 ? -1 : 1;
249 static ssize_t __init prom_strscpy_pad(char *dest, const char *src, size_t n)
254 if (n == 0 || n > INT_MAX)
257 // Copy up to n bytes
258 for (i = 0; i < n && src[i] != '\0'; i++)
263 // If we copied all n then we have run out of space for the nul
265 // Rewind by one character to ensure nul termination
276 static int __init prom_strncmp(const char *cs, const char *ct, size_t count)
278 unsigned char c1, c2;
284 return c1 < c2 ? -1 : 1;
292 static size_t __init prom_strlen(const char *s)
296 for (sc = s; *sc != '\0'; ++sc)
301 static int __init prom_memcmp(const void *cs, const void *ct, size_t count)
303 const unsigned char *su1, *su2;
306 for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
307 if ((res = *su1 - *su2) != 0)
312 static char __init *prom_strstr(const char *s1, const char *s2)
316 l2 = prom_strlen(s2);
319 l1 = prom_strlen(s1);
322 if (!prom_memcmp(s1, s2, l2))
329 static size_t __init prom_strlcat(char *dest, const char *src, size_t count)
331 size_t dsize = prom_strlen(dest);
332 size_t len = prom_strlen(src);
333 size_t res = dsize + len;
335 /* This would be a bug */
343 memcpy(dest, src, len);
349 #ifdef CONFIG_PPC_PSERIES
350 static int __init prom_strtobool(const char *s, bool *res)
389 /* This is the one and *ONLY* place where we actually call open
393 static int __init call_prom(const char *service, int nargs, int nret, ...)
396 struct prom_args args;
399 args.service = cpu_to_be32(ADDR(service));
400 args.nargs = cpu_to_be32(nargs);
401 args.nret = cpu_to_be32(nret);
403 va_start(list, nret);
404 for (i = 0; i < nargs; i++)
405 args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));
408 for (i = 0; i < nret; i++)
409 args.args[nargs+i] = 0;
411 if (enter_prom(&args, prom_entry) < 0)
414 return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;
417 static int __init call_prom_ret(const char *service, int nargs, int nret,
418 prom_arg_t *rets, ...)
421 struct prom_args args;
424 args.service = cpu_to_be32(ADDR(service));
425 args.nargs = cpu_to_be32(nargs);
426 args.nret = cpu_to_be32(nret);
428 va_start(list, rets);
429 for (i = 0; i < nargs; i++)
430 args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));
433 for (i = 0; i < nret; i++)
434 args.args[nargs+i] = 0;
436 if (enter_prom(&args, prom_entry) < 0)
440 for (i = 1; i < nret; ++i)
441 rets[i-1] = be32_to_cpu(args.args[nargs+i]);
443 return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;
447 static void __init prom_print(const char *msg)
451 if (prom.stdout == 0)
454 for (p = msg; *p != 0; p = q) {
455 for (q = p; *q != 0 && *q != '\n'; ++q)
458 call_prom("write", 3, 1, prom.stdout, p, q - p);
462 call_prom("write", 3, 1, prom.stdout, ADDR("\r\n"), 2);
468 * Both prom_print_hex & prom_print_dec takes an unsigned long as input so that
469 * we do not need __udivdi3 or __umoddi3 on 32bits.
471 static void __init prom_print_hex(unsigned long val)
473 int i, nibbles = sizeof(val)*2;
474 char buf[sizeof(val)*2+1];
476 for (i = nibbles-1; i >= 0; i--) {
477 buf[i] = (val & 0xf) + '0';
479 buf[i] += ('a'-'0'-10);
483 call_prom("write", 3, 1, prom.stdout, buf, nibbles);
486 /* max number of decimal digits in an unsigned long */
488 static void __init prom_print_dec(unsigned long val)
491 char buf[UL_DIGITS+1];
493 for (i = UL_DIGITS-1; i >= 0; i--) {
494 buf[i] = (val % 10) + '0';
499 /* shift stuff down */
500 size = UL_DIGITS - i;
501 call_prom("write", 3, 1, prom.stdout, buf+i, size);
505 static void __init prom_printf(const char *format, ...)
507 const char *p, *q, *s;
513 va_start(args, format);
514 for (p = format; *p != 0; p = q) {
515 for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
518 call_prom("write", 3, 1, prom.stdout, p, q - p);
523 call_prom("write", 3, 1, prom.stdout,
537 s = va_arg(args, const char *);
544 v = va_arg(args, unsigned int);
547 v = va_arg(args, unsigned long);
551 v = va_arg(args, unsigned long long);
560 v = va_arg(args, unsigned int);
563 v = va_arg(args, unsigned long);
567 v = va_arg(args, unsigned long long);
576 vs = va_arg(args, int);
579 vs = va_arg(args, long);
583 vs = va_arg(args, long long);
598 static unsigned int __init prom_claim(unsigned long virt, unsigned long size,
602 if (align == 0 && (OF_WORKAROUNDS & OF_WA_CLAIM)) {
604 * Old OF requires we claim physical and virtual separately
605 * and then map explicitly (assuming virtual mode)
610 ret = call_prom_ret("call-method", 5, 2, &result,
611 ADDR("claim"), prom.memory,
613 if (ret != 0 || result == -1)
615 ret = call_prom_ret("call-method", 5, 2, &result,
616 ADDR("claim"), prom.mmumap,
619 call_prom("call-method", 4, 1, ADDR("release"),
620 prom.memory, size, virt);
623 /* the 0x12 is M (coherence) + PP == read/write */
624 call_prom("call-method", 6, 1,
625 ADDR("map"), prom.mmumap, 0x12, size, virt, virt);
628 return call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size,
632 static void __init __attribute__((noreturn)) prom_panic(const char *reason)
635 /* Do not call exit because it clears the screen on pmac
636 * it also causes some sort of double-fault on early pmacs */
637 if (of_platform == PLATFORM_POWERMAC)
640 /* ToDo: should put up an SRC here on pSeries */
641 call_prom("exit", 0, 0);
643 for (;;) /* should never get here */
648 static int __init prom_next_node(phandle *nodep)
652 if ((node = *nodep) != 0
653 && (*nodep = call_prom("child", 1, 1, node)) != 0)
655 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
658 if ((node = call_prom("parent", 1, 1, node)) == 0)
660 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
665 static inline int __init prom_getprop(phandle node, const char *pname,
666 void *value, size_t valuelen)
668 return call_prom("getprop", 4, 1, node, ADDR(pname),
669 (u32)(unsigned long) value, (u32) valuelen);
672 static inline int __init prom_getproplen(phandle node, const char *pname)
674 return call_prom("getproplen", 2, 1, node, ADDR(pname));
677 static void __init add_string(char **str, const char *q)
687 static char *__init tohex(unsigned int x)
689 static const char digits[] __initconst = "0123456789abcdef";
690 static char result[9] __prombss;
697 result[i] = digits[x & 0xf];
699 } while (x != 0 && i > 0);
703 static int __init prom_setprop(phandle node, const char *nodename,
704 const char *pname, void *value, size_t valuelen)
708 if (!(OF_WORKAROUNDS & OF_WA_LONGTRAIL))
709 return call_prom("setprop", 4, 1, node, ADDR(pname),
710 (u32)(unsigned long) value, (u32) valuelen);
712 /* gah... setprop doesn't work on longtrail, have to use interpret */
714 add_string(&p, "dev");
715 add_string(&p, nodename);
716 add_string(&p, tohex((u32)(unsigned long) value));
717 add_string(&p, tohex(valuelen));
718 add_string(&p, tohex(ADDR(pname)));
719 add_string(&p, tohex(prom_strlen(pname)));
720 add_string(&p, "property");
722 return call_prom("interpret", 1, 1, (u32)(unsigned long) cmd);
725 /* We can't use the standard versions because of relocation headaches. */
726 #define prom_isxdigit(c) \
727 (('0' <= (c) && (c) <= '9') || ('a' <= (c) && (c) <= 'f') || ('A' <= (c) && (c) <= 'F'))
729 #define prom_isdigit(c) ('0' <= (c) && (c) <= '9')
730 #define prom_islower(c) ('a' <= (c) && (c) <= 'z')
731 #define prom_toupper(c) (prom_islower(c) ? ((c) - 'a' + 'A') : (c))
733 static unsigned long __init prom_strtoul(const char *cp, const char **endp)
735 unsigned long result = 0, base = 10, value;
740 if (prom_toupper(*cp) == 'X') {
746 while (prom_isxdigit(*cp) &&
747 (value = prom_isdigit(*cp) ? *cp - '0' : prom_toupper(*cp) - 'A' + 10) < base) {
748 result = result * base + value;
758 static unsigned long __init prom_memparse(const char *ptr, const char **retptr)
760 unsigned long ret = prom_strtoul(ptr, retptr);
764 * We can't use a switch here because GCC *may* generate a
765 * jump table which won't work, because we're not running at
766 * the address we're linked at.
768 if ('G' == **retptr || 'g' == **retptr)
771 if ('M' == **retptr || 'm' == **retptr)
774 if ('K' == **retptr || 'k' == **retptr)
786 * Early parsing of the command line passed to the kernel, used for
787 * "mem=x" and the options that affect the iommu
789 static void __init early_cmdline_parse(void)
796 prom_cmd_line[0] = 0;
799 if (!IS_ENABLED(CONFIG_CMDLINE_FORCE) && (long)prom.chosen > 0)
800 l = prom_getprop(prom.chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
802 if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) || l <= 0 || p[0] == '\0')
803 prom_strlcat(prom_cmd_line, " " CONFIG_CMDLINE,
804 sizeof(prom_cmd_line));
806 prom_printf("command line: %s\n", prom_cmd_line);
809 opt = prom_strstr(prom_cmd_line, "iommu=");
811 prom_printf("iommu opt is: %s\n", opt);
813 while (*opt && *opt == ' ')
815 if (!prom_strncmp(opt, "off", 3))
817 else if (!prom_strncmp(opt, "force", 5))
818 prom_iommu_force_on = 1;
821 opt = prom_strstr(prom_cmd_line, "mem=");
824 prom_memory_limit = prom_memparse(opt, (const char **)&opt);
826 /* Align to 16 MB == size of ppc64 large page */
827 prom_memory_limit = ALIGN(prom_memory_limit, 0x1000000);
831 #ifdef CONFIG_PPC_PSERIES
832 prom_radix_disable = !IS_ENABLED(CONFIG_PPC_RADIX_MMU_DEFAULT);
833 opt = prom_strstr(prom_cmd_line, "disable_radix");
836 if (*opt && *opt == '=') {
839 if (prom_strtobool(++opt, &val))
840 prom_radix_disable = false;
842 prom_radix_disable = val;
844 prom_radix_disable = true;
846 if (prom_radix_disable)
847 prom_debug("Radix disabled from cmdline\n");
849 opt = prom_strstr(prom_cmd_line, "radix_hcall_invalidate=on");
851 prom_radix_gtse_disable = true;
852 prom_debug("Radix GTSE disabled from cmdline\n");
855 opt = prom_strstr(prom_cmd_line, "xive=off");
857 prom_xive_disable = true;
858 prom_debug("XIVE disabled from cmdline\n");
860 #endif /* CONFIG_PPC_PSERIES */
862 #ifdef CONFIG_PPC_SVM
863 opt = prom_strstr(prom_cmd_line, "svm=");
867 opt += sizeof("svm=") - 1;
868 if (!prom_strtobool(opt, &val))
869 prom_svm_enable = val;
871 #endif /* CONFIG_PPC_SVM */
874 #ifdef CONFIG_PPC_PSERIES
876 * The architecture vector has an array of PVR mask/value pairs,
877 * followed by # option vectors - 1, followed by the option vectors.
879 * See prom.h for the definition of the bits specified in the
880 * architecture vector.
883 /* Firmware expects the value to be n - 1, where n is the # of vectors */
884 #define NUM_VECTORS(n) ((n) - 1)
887 * Firmware expects 1 + n - 2, where n is the length of the option vector in
888 * bytes. The 1 accounts for the length byte itself, the - 2 .. ?
890 #define VECTOR_LENGTH(n) (1 + (n) - 2)
892 struct option_vector1 {
898 struct option_vector2 {
912 struct option_vector3 {
917 struct option_vector4 {
922 struct option_vector5 {
934 u8 platform_facilities;
945 struct option_vector6 {
951 struct option_vector7 {
955 struct ibm_arch_vec {
956 struct { u32 mask, val; } pvrs[14];
961 struct option_vector1 vec1;
964 struct option_vector2 vec2;
967 struct option_vector3 vec3;
970 struct option_vector4 vec4;
973 struct option_vector5 vec5;
976 struct option_vector6 vec6;
979 struct option_vector7 vec7;
982 static const struct ibm_arch_vec ibm_architecture_vec_template __initconst = {
985 .mask = cpu_to_be32(0xfffe0000), /* POWER5/POWER5+ */
986 .val = cpu_to_be32(0x003a0000),
989 .mask = cpu_to_be32(0xffff0000), /* POWER6 */
990 .val = cpu_to_be32(0x003e0000),
993 .mask = cpu_to_be32(0xffff0000), /* POWER7 */
994 .val = cpu_to_be32(0x003f0000),
997 .mask = cpu_to_be32(0xffff0000), /* POWER8E */
998 .val = cpu_to_be32(0x004b0000),
1001 .mask = cpu_to_be32(0xffff0000), /* POWER8NVL */
1002 .val = cpu_to_be32(0x004c0000),
1005 .mask = cpu_to_be32(0xffff0000), /* POWER8 */
1006 .val = cpu_to_be32(0x004d0000),
1009 .mask = cpu_to_be32(0xffff0000), /* POWER9 */
1010 .val = cpu_to_be32(0x004e0000),
1013 .mask = cpu_to_be32(0xffff0000), /* POWER10 */
1014 .val = cpu_to_be32(0x00800000),
1017 .mask = cpu_to_be32(0xffffffff), /* all 3.1-compliant */
1018 .val = cpu_to_be32(0x0f000006),
1021 .mask = cpu_to_be32(0xffffffff), /* all 3.00-compliant */
1022 .val = cpu_to_be32(0x0f000005),
1025 .mask = cpu_to_be32(0xffffffff), /* all 2.07-compliant */
1026 .val = cpu_to_be32(0x0f000004),
1029 .mask = cpu_to_be32(0xffffffff), /* all 2.06-compliant */
1030 .val = cpu_to_be32(0x0f000003),
1033 .mask = cpu_to_be32(0xffffffff), /* all 2.05-compliant */
1034 .val = cpu_to_be32(0x0f000002),
1037 .mask = cpu_to_be32(0xfffffffe), /* all 2.04-compliant and earlier */
1038 .val = cpu_to_be32(0x0f000001),
1042 .num_vectors = NUM_VECTORS(6),
1044 .vec1_len = VECTOR_LENGTH(sizeof(struct option_vector1)),
1047 .arch_versions = OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 |
1048 OV1_PPC_2_04 | OV1_PPC_2_05 | OV1_PPC_2_06 | OV1_PPC_2_07,
1049 .arch_versions3 = OV1_PPC_3_00 | OV1_PPC_3_1,
1052 .vec2_len = VECTOR_LENGTH(sizeof(struct option_vector2)),
1053 /* option vector 2: Open Firmware options supported */
1055 .byte1 = OV2_REAL_MODE,
1057 .real_base = cpu_to_be32(0xffffffff),
1058 .real_size = cpu_to_be32(0xffffffff),
1059 .virt_base = cpu_to_be32(0xffffffff),
1060 .virt_size = cpu_to_be32(0xffffffff),
1061 .load_base = cpu_to_be32(0xffffffff),
1062 .min_rma = cpu_to_be32(512), /* 512MB min RMA */
1063 .min_load = cpu_to_be32(0xffffffff), /* full client load */
1064 .min_rma_percent = 0, /* min RMA percentage of total RAM */
1065 .max_pft_size = 48, /* max log_2(hash table size) */
1068 .vec3_len = VECTOR_LENGTH(sizeof(struct option_vector3)),
1069 /* option vector 3: processor options supported */
1071 .byte1 = 0, /* don't ignore, don't halt */
1072 .byte2 = OV3_FP | OV3_VMX | OV3_DFP,
1075 .vec4_len = VECTOR_LENGTH(sizeof(struct option_vector4)),
1076 /* option vector 4: IBM PAPR implementation */
1078 .byte1 = 0, /* don't halt */
1079 .min_vp_cap = OV4_MIN_ENT_CAP, /* minimum VP entitled capacity */
1082 .vec5_len = VECTOR_LENGTH(sizeof(struct option_vector5)),
1083 /* option vector 5: PAPR/OF options */
1085 .byte1 = 0, /* don't ignore, don't halt */
1086 .byte2 = OV5_FEAT(OV5_LPAR) | OV5_FEAT(OV5_SPLPAR) | OV5_FEAT(OV5_LARGE_PAGES) |
1087 OV5_FEAT(OV5_DRCONF_MEMORY) | OV5_FEAT(OV5_DONATE_DEDICATE_CPU) |
1088 #ifdef CONFIG_PCI_MSI
1089 /* PCIe/MSI support. Without MSI full PCIe is not supported */
1096 #ifdef CONFIG_PPC_SMLPAR
1097 OV5_FEAT(OV5_CMO) | OV5_FEAT(OV5_XCMO),
1101 .associativity = OV5_FEAT(OV5_FORM1_AFFINITY) | OV5_FEAT(OV5_PRRN) |
1102 OV5_FEAT(OV5_FORM2_AFFINITY),
1103 .bin_opts = OV5_FEAT(OV5_RESIZE_HPT) | OV5_FEAT(OV5_HP_EVT),
1104 .micro_checkpoint = 0,
1106 .max_cpus = cpu_to_be32(NR_CPUS), /* number of cores supported */
1109 .platform_facilities = OV5_FEAT(OV5_PFO_HW_RNG) | OV5_FEAT(OV5_PFO_HW_ENCR) | OV5_FEAT(OV5_PFO_HW_842),
1113 .byte22 = OV5_FEAT(OV5_DRMEM_V2) | OV5_FEAT(OV5_DRC_INFO),
1120 /* option vector 6: IBM PAPR hints */
1121 .vec6_len = VECTOR_LENGTH(sizeof(struct option_vector6)),
1124 .secondary_pteg = 0,
1125 .os_name = OV6_LINUX,
1128 /* option vector 7: OS Identification */
1129 .vec7_len = VECTOR_LENGTH(sizeof(struct option_vector7)),
1132 static struct ibm_arch_vec __prombss ibm_architecture_vec ____cacheline_aligned;
1134 /* Old method - ELF header with PT_NOTE sections only works on BE */
1135 #ifdef __BIG_ENDIAN__
1136 static const struct fake_elf {
1143 char name[8]; /* "PowerPC" */
1157 char name[24]; /* "IBM,RPA-Client-Config" */
1161 u32 min_rmo_percent;
1169 } fake_elf __initconst = {
1171 .e_ident = { 0x7f, 'E', 'L', 'F',
1172 ELFCLASS32, ELFDATA2MSB, EV_CURRENT },
1173 .e_type = ET_EXEC, /* yeah right */
1174 .e_machine = EM_PPC,
1175 .e_version = EV_CURRENT,
1176 .e_phoff = offsetof(struct fake_elf, phdr),
1177 .e_phentsize = sizeof(Elf32_Phdr),
1183 .p_offset = offsetof(struct fake_elf, chrpnote),
1184 .p_filesz = sizeof(struct chrpnote)
1187 .p_offset = offsetof(struct fake_elf, rpanote),
1188 .p_filesz = sizeof(struct rpanote)
1192 .namesz = sizeof("PowerPC"),
1193 .descsz = sizeof(struct chrpdesc),
1197 .real_mode = ~0U, /* ~0 means "don't care" */
1206 .namesz = sizeof("IBM,RPA-Client-Config"),
1207 .descsz = sizeof(struct rpadesc),
1209 .name = "IBM,RPA-Client-Config",
1212 .min_rmo_size = 64, /* in megabytes */
1213 .min_rmo_percent = 0,
1214 .max_pft_size = 48, /* 2^48 bytes max PFT size */
1221 #endif /* __BIG_ENDIAN__ */
1223 static int __init prom_count_smt_threads(void)
1229 /* Pick up th first CPU node we can find */
1230 for (node = 0; prom_next_node(&node); ) {
1232 prom_getprop(node, "device_type", type, sizeof(type));
1234 if (prom_strcmp(type, "cpu"))
1237 * There is an entry for each smt thread, each entry being
1238 * 4 bytes long. All cpus should have the same number of
1239 * smt threads, so return after finding the first.
1241 plen = prom_getproplen(node, "ibm,ppc-interrupt-server#s");
1242 if (plen == PROM_ERROR)
1245 prom_debug("Found %lu smt threads per core\n", (unsigned long)plen);
1248 if (plen < 1 || plen > 64) {
1249 prom_printf("Threads per core %lu out of bounds, assuming 1\n",
1250 (unsigned long)plen);
1255 prom_debug("No threads found, assuming 1 per core\n");
1261 static void __init prom_parse_mmu_model(u8 val,
1262 struct platform_support *support)
1265 case OV5_FEAT(OV5_MMU_DYNAMIC):
1266 case OV5_FEAT(OV5_MMU_EITHER): /* Either Available */
1267 prom_debug("MMU - either supported\n");
1268 support->radix_mmu = !prom_radix_disable;
1269 support->hash_mmu = true;
1271 case OV5_FEAT(OV5_MMU_RADIX): /* Only Radix */
1272 prom_debug("MMU - radix only\n");
1273 if (prom_radix_disable) {
1275 * If we __have__ to do radix, we're better off ignoring
1276 * the command line rather than not booting.
1278 prom_printf("WARNING: Ignoring cmdline option disable_radix\n");
1280 support->radix_mmu = true;
1282 case OV5_FEAT(OV5_MMU_HASH):
1283 prom_debug("MMU - hash only\n");
1284 support->hash_mmu = true;
1287 prom_debug("Unknown mmu support option: 0x%x\n", val);
1292 static void __init prom_parse_xive_model(u8 val,
1293 struct platform_support *support)
1296 case OV5_FEAT(OV5_XIVE_EITHER): /* Either Available */
1297 prom_debug("XIVE - either mode supported\n");
1298 support->xive = !prom_xive_disable;
1300 case OV5_FEAT(OV5_XIVE_EXPLOIT): /* Only Exploitation mode */
1301 prom_debug("XIVE - exploitation mode supported\n");
1302 if (prom_xive_disable) {
1304 * If we __have__ to do XIVE, we're better off ignoring
1305 * the command line rather than not booting.
1307 prom_printf("WARNING: Ignoring cmdline option xive=off\n");
1309 support->xive = true;
1311 case OV5_FEAT(OV5_XIVE_LEGACY): /* Only Legacy mode */
1312 prom_debug("XIVE - legacy mode supported\n");
1315 prom_debug("Unknown xive support option: 0x%x\n", val);
1320 static void __init prom_parse_platform_support(u8 index, u8 val,
1321 struct platform_support *support)
1324 case OV5_INDX(OV5_MMU_SUPPORT): /* MMU Model */
1325 prom_parse_mmu_model(val & OV5_FEAT(OV5_MMU_SUPPORT), support);
1327 case OV5_INDX(OV5_RADIX_GTSE): /* Radix Extensions */
1328 if (val & OV5_FEAT(OV5_RADIX_GTSE))
1329 support->radix_gtse = !prom_radix_gtse_disable;
1331 case OV5_INDX(OV5_XIVE_SUPPORT): /* Interrupt mode */
1332 prom_parse_xive_model(val & OV5_FEAT(OV5_XIVE_SUPPORT),
1338 static void __init prom_check_platform_support(void)
1340 struct platform_support supported = {
1343 .radix_gtse = false,
1346 int prop_len = prom_getproplen(prom.chosen,
1347 "ibm,arch-vec-5-platform-support");
1350 * First copy the architecture vec template
1352 * use memcpy() instead of *vec = *vec_template so that GCC replaces it
1353 * by __memcpy() when KASAN is active
1355 memcpy(&ibm_architecture_vec, &ibm_architecture_vec_template,
1356 sizeof(ibm_architecture_vec));
1358 prom_strscpy_pad(ibm_architecture_vec.vec7.os_id, linux_banner, 256);
1363 prom_debug("Found ibm,arch-vec-5-platform-support, len: %d\n",
1365 if (prop_len > sizeof(vec))
1366 prom_printf("WARNING: ibm,arch-vec-5-platform-support longer than expected (len: %d)\n",
1368 prom_getprop(prom.chosen, "ibm,arch-vec-5-platform-support", &vec, sizeof(vec));
1369 for (i = 0; i < prop_len; i += 2) {
1370 prom_debug("%d: index = 0x%x val = 0x%x\n", i / 2, vec[i], vec[i + 1]);
1371 prom_parse_platform_support(vec[i], vec[i + 1], &supported);
1375 if (supported.radix_mmu && IS_ENABLED(CONFIG_PPC_RADIX_MMU)) {
1376 /* Radix preferred - Check if GTSE is also supported */
1377 prom_debug("Asking for radix\n");
1378 ibm_architecture_vec.vec5.mmu = OV5_FEAT(OV5_MMU_RADIX);
1379 if (supported.radix_gtse)
1380 ibm_architecture_vec.vec5.radix_ext =
1381 OV5_FEAT(OV5_RADIX_GTSE);
1383 prom_debug("Radix GTSE isn't supported\n");
1384 } else if (supported.hash_mmu) {
1385 /* Default to hash mmu (if we can) */
1386 prom_debug("Asking for hash\n");
1387 ibm_architecture_vec.vec5.mmu = OV5_FEAT(OV5_MMU_HASH);
1389 /* We're probably on a legacy hypervisor */
1390 prom_debug("Assuming legacy hash support\n");
1393 if (supported.xive) {
1394 prom_debug("Asking for XIVE\n");
1395 ibm_architecture_vec.vec5.intarch = OV5_FEAT(OV5_XIVE_EXPLOIT);
1399 static void __init prom_send_capabilities(void)
1405 /* Check ibm,arch-vec-5-platform-support and fixup vec5 if required */
1406 prom_check_platform_support();
1408 root = call_prom("open", 1, 1, ADDR("/"));
1410 /* We need to tell the FW about the number of cores we support.
1412 * To do that, we count the number of threads on the first core
1413 * (we assume this is the same for all cores) and use it to
1417 cores = DIV_ROUND_UP(NR_CPUS, prom_count_smt_threads());
1418 prom_printf("Max number of cores passed to firmware: %u (NR_CPUS = %d)\n",
1421 ibm_architecture_vec.vec5.max_cpus = cpu_to_be32(cores);
1423 /* try calling the ibm,client-architecture-support method */
1424 prom_printf("Calling ibm,client-architecture-support...");
1425 if (call_prom_ret("call-method", 3, 2, &ret,
1426 ADDR("ibm,client-architecture-support"),
1428 ADDR(&ibm_architecture_vec)) == 0) {
1429 /* the call exists... */
1431 prom_printf("\nWARNING: ibm,client-architecture"
1432 "-support call FAILED!\n");
1433 call_prom("close", 1, 0, root);
1434 prom_printf(" done\n");
1437 call_prom("close", 1, 0, root);
1438 prom_printf(" not implemented\n");
1441 #ifdef __BIG_ENDIAN__
1445 /* no ibm,client-architecture-support call, try the old way */
1446 elfloader = call_prom("open", 1, 1,
1447 ADDR("/packages/elf-loader"));
1448 if (elfloader == 0) {
1449 prom_printf("couldn't open /packages/elf-loader\n");
1452 call_prom("call-method", 3, 1, ADDR("process-elf-header"),
1453 elfloader, ADDR(&fake_elf));
1454 call_prom("close", 1, 0, elfloader);
1456 #endif /* __BIG_ENDIAN__ */
1458 #endif /* CONFIG_PPC_PSERIES */
1461 * Memory allocation strategy... our layout is normally:
1463 * at 14Mb or more we have vmlinux, then a gap and initrd. In some
1464 * rare cases, initrd might end up being before the kernel though.
1465 * We assume this won't override the final kernel at 0, we have no
1466 * provision to handle that in this version, but it should hopefully
1469 * alloc_top is set to the top of RMO, eventually shrink down if the
1472 * alloc_bottom is set to the top of kernel/initrd
1474 * from there, allocations are done this way : rtas is allocated
1475 * topmost, and the device-tree is allocated from the bottom. We try
1476 * to grow the device-tree allocation as we progress. If we can't,
1477 * then we fail, we don't currently have a facility to restart
1478 * elsewhere, but that shouldn't be necessary.
1480 * Note that calls to reserve_mem have to be done explicitly, memory
1481 * allocated with either alloc_up or alloc_down isn't automatically
1487 * Allocates memory in the RMO upward from the kernel/initrd
1489 * When align is 0, this is a special case, it means to allocate in place
1490 * at the current location of alloc_bottom or fail (that is basically
1491 * extending the previous allocation). Used for the device-tree flattening
1493 static unsigned long __init alloc_up(unsigned long size, unsigned long align)
1495 unsigned long base = alloc_bottom;
1496 unsigned long addr = 0;
1499 base = ALIGN(base, align);
1500 prom_debug("%s(%lx, %lx)\n", __func__, size, align);
1502 prom_panic("alloc_up() called with mem not initialized\n");
1505 base = ALIGN(alloc_bottom, align);
1507 base = alloc_bottom;
1509 for(; (base + size) <= alloc_top;
1510 base = ALIGN(base + 0x100000, align)) {
1511 prom_debug(" trying: 0x%lx\n\r", base);
1512 addr = (unsigned long)prom_claim(base, size, 0);
1513 if (addr != PROM_ERROR && addr != 0)
1521 alloc_bottom = addr + size;
1523 prom_debug(" -> %lx\n", addr);
1524 prom_debug(" alloc_bottom : %lx\n", alloc_bottom);
1525 prom_debug(" alloc_top : %lx\n", alloc_top);
1526 prom_debug(" alloc_top_hi : %lx\n", alloc_top_high);
1527 prom_debug(" rmo_top : %lx\n", rmo_top);
1528 prom_debug(" ram_top : %lx\n", ram_top);
1534 * Allocates memory downward, either from top of RMO, or if highmem
1535 * is set, from the top of RAM. Note that this one doesn't handle
1536 * failures. It does claim memory if highmem is not set.
1538 static unsigned long __init alloc_down(unsigned long size, unsigned long align,
1541 unsigned long base, addr = 0;
1543 prom_debug("%s(%lx, %lx, %s)\n", __func__, size, align,
1544 highmem ? "(high)" : "(low)");
1546 prom_panic("alloc_down() called with mem not initialized\n");
1549 /* Carve out storage for the TCE table. */
1550 addr = ALIGN_DOWN(alloc_top_high - size, align);
1551 if (addr <= alloc_bottom)
1553 /* Will we bump into the RMO ? If yes, check out that we
1554 * didn't overlap existing allocations there, if we did,
1555 * we are dead, we must be the first in town !
1557 if (addr < rmo_top) {
1558 /* Good, we are first */
1559 if (alloc_top == rmo_top)
1560 alloc_top = rmo_top = addr;
1564 alloc_top_high = addr;
1568 base = ALIGN_DOWN(alloc_top - size, align);
1569 for (; base > alloc_bottom;
1570 base = ALIGN_DOWN(base - 0x100000, align)) {
1571 prom_debug(" trying: 0x%lx\n\r", base);
1572 addr = (unsigned long)prom_claim(base, size, 0);
1573 if (addr != PROM_ERROR && addr != 0)
1582 prom_debug(" -> %lx\n", addr);
1583 prom_debug(" alloc_bottom : %lx\n", alloc_bottom);
1584 prom_debug(" alloc_top : %lx\n", alloc_top);
1585 prom_debug(" alloc_top_hi : %lx\n", alloc_top_high);
1586 prom_debug(" rmo_top : %lx\n", rmo_top);
1587 prom_debug(" ram_top : %lx\n", ram_top);
1593 * Parse a "reg" cell
1595 static unsigned long __init prom_next_cell(int s, cell_t **cellp)
1598 unsigned long r = 0;
1600 /* Ignore more than 2 cells */
1601 while (s > sizeof(unsigned long) / 4) {
1605 r = be32_to_cpu(*p++);
1609 r |= be32_to_cpu(*(p++));
1617 * Very dumb function for adding to the memory reserve list, but
1618 * we don't need anything smarter at this point
1620 * XXX Eventually check for collisions. They should NEVER happen.
1621 * If problems seem to show up, it would be a good start to track
1624 static void __init reserve_mem(u64 base, u64 size)
1626 u64 top = base + size;
1627 unsigned long cnt = mem_reserve_cnt;
1632 /* We need to always keep one empty entry so that we
1633 * have our terminator with "size" set to 0 since we are
1634 * dumb and just copy this entire array to the boot params
1636 base = ALIGN_DOWN(base, PAGE_SIZE);
1637 top = ALIGN(top, PAGE_SIZE);
1640 if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))
1641 prom_panic("Memory reserve map exhausted !\n");
1642 mem_reserve_map[cnt].base = cpu_to_be64(base);
1643 mem_reserve_map[cnt].size = cpu_to_be64(size);
1644 mem_reserve_cnt = cnt + 1;
1648 * Initialize memory allocation mechanism, parse "memory" nodes and
1649 * obtain that way the top of memory and RMO to setup out local allocator
1651 static void __init prom_init_mem(void)
1661 * We iterate the memory nodes to find
1662 * 1) top of RMO (first node)
1665 val = cpu_to_be32(2);
1666 prom_getprop(prom.root, "#address-cells", &val, sizeof(val));
1667 rac = be32_to_cpu(val);
1668 val = cpu_to_be32(1);
1669 prom_getprop(prom.root, "#size-cells", &val, sizeof(rsc));
1670 rsc = be32_to_cpu(val);
1671 prom_debug("root_addr_cells: %x\n", rac);
1672 prom_debug("root_size_cells: %x\n", rsc);
1674 prom_debug("scanning memory:\n");
1676 for (node = 0; prom_next_node(&node); ) {
1678 prom_getprop(node, "device_type", type, sizeof(type));
1682 * CHRP Longtrail machines have no device_type
1683 * on the memory node, so check the name instead...
1685 prom_getprop(node, "name", type, sizeof(type));
1687 if (prom_strcmp(type, "memory"))
1690 plen = prom_getprop(node, "reg", regbuf, sizeof(regbuf));
1691 if (plen > sizeof(regbuf)) {
1692 prom_printf("memory node too large for buffer !\n");
1693 plen = sizeof(regbuf);
1696 endp = p + (plen / sizeof(cell_t));
1699 memset(prom_scratch, 0, sizeof(prom_scratch));
1700 call_prom("package-to-path", 3, 1, node, prom_scratch,
1701 sizeof(prom_scratch) - 1);
1702 prom_debug(" node %s :\n", prom_scratch);
1703 #endif /* DEBUG_PROM */
1705 while ((endp - p) >= (rac + rsc)) {
1706 unsigned long base, size;
1708 base = prom_next_cell(rac, &p);
1709 size = prom_next_cell(rsc, &p);
1713 prom_debug(" %lx %lx\n", base, size);
1714 if (base == 0 && (of_platform & PLATFORM_LPAR))
1716 if ((base + size) > ram_top)
1717 ram_top = base + size;
1721 alloc_bottom = PAGE_ALIGN((unsigned long)&_end + 0x4000);
1724 * If prom_memory_limit is set we reduce the upper limits *except* for
1725 * alloc_top_high. This must be the real top of RAM so we can put
1729 alloc_top_high = ram_top;
1731 if (prom_memory_limit) {
1732 if (prom_memory_limit <= alloc_bottom) {
1733 prom_printf("Ignoring mem=%lx <= alloc_bottom.\n",
1735 prom_memory_limit = 0;
1736 } else if (prom_memory_limit >= ram_top) {
1737 prom_printf("Ignoring mem=%lx >= ram_top.\n",
1739 prom_memory_limit = 0;
1741 ram_top = prom_memory_limit;
1742 rmo_top = min(rmo_top, prom_memory_limit);
1747 * Setup our top alloc point, that is top of RMO or top of
1748 * segment 0 when running non-LPAR.
1749 * Some RS64 machines have buggy firmware where claims up at
1750 * 1GB fail. Cap at 768MB as a workaround.
1751 * Since 768MB is plenty of room, and we need to cap to something
1752 * reasonable on 32-bit, cap at 768MB on all machines.
1756 rmo_top = min(0x30000000ul, rmo_top);
1757 alloc_top = rmo_top;
1758 alloc_top_high = ram_top;
1761 * Check if we have an initrd after the kernel but still inside
1762 * the RMO. If we do move our bottom point to after it.
1764 if (prom_initrd_start &&
1765 prom_initrd_start < rmo_top &&
1766 prom_initrd_end > alloc_bottom)
1767 alloc_bottom = PAGE_ALIGN(prom_initrd_end);
1769 prom_printf("memory layout at init:\n");
1770 prom_printf(" memory_limit : %lx (16 MB aligned)\n",
1772 prom_printf(" alloc_bottom : %lx\n", alloc_bottom);
1773 prom_printf(" alloc_top : %lx\n", alloc_top);
1774 prom_printf(" alloc_top_hi : %lx\n", alloc_top_high);
1775 prom_printf(" rmo_top : %lx\n", rmo_top);
1776 prom_printf(" ram_top : %lx\n", ram_top);
1779 static void __init prom_close_stdin(void)
1784 if (prom_getprop(prom.chosen, "stdin", &val, sizeof(val)) > 0) {
1785 stdin = be32_to_cpu(val);
1786 call_prom("close", 1, 0, stdin);
1790 #ifdef CONFIG_PPC_SVM
1791 static int __init prom_rtas_hcall(uint64_t args)
1793 register uint64_t arg1 asm("r3") = H_RTAS;
1794 register uint64_t arg2 asm("r4") = args;
1796 asm volatile("sc 1\n" : "=r" (arg1) :
1799 srr_regs_clobbered();
1804 static struct rtas_args __prombss os_term_args;
1806 static void __init prom_rtas_os_term(char *str)
1812 prom_debug("%s: start...\n", __func__);
1813 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1814 prom_debug("rtas_node: %x\n", rtas_node);
1815 if (!PHANDLE_VALID(rtas_node))
1819 prom_getprop(rtas_node, "ibm,os-term", &val, sizeof(val));
1820 token = be32_to_cpu(val);
1821 prom_debug("ibm,os-term: %x\n", token);
1823 prom_panic("Could not get token for ibm,os-term\n");
1824 os_term_args.token = cpu_to_be32(token);
1825 os_term_args.nargs = cpu_to_be32(1);
1826 os_term_args.nret = cpu_to_be32(1);
1827 os_term_args.args[0] = cpu_to_be32(__pa(str));
1828 prom_rtas_hcall((uint64_t)&os_term_args);
1830 #endif /* CONFIG_PPC_SVM */
1833 * Allocate room for and instantiate RTAS
1835 static void __init prom_instantiate_rtas(void)
1839 u32 base, entry = 0;
1843 prom_debug("prom_instantiate_rtas: start...\n");
1845 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1846 prom_debug("rtas_node: %x\n", rtas_node);
1847 if (!PHANDLE_VALID(rtas_node))
1851 prom_getprop(rtas_node, "rtas-size", &val, sizeof(size));
1852 size = be32_to_cpu(val);
1856 base = alloc_down(size, PAGE_SIZE, 0);
1858 prom_panic("Could not allocate memory for RTAS\n");
1860 rtas_inst = call_prom("open", 1, 1, ADDR("/rtas"));
1861 if (!IHANDLE_VALID(rtas_inst)) {
1862 prom_printf("opening rtas package failed (%x)\n", rtas_inst);
1866 prom_printf("instantiating rtas at 0x%x...", base);
1868 if (call_prom_ret("call-method", 3, 2, &entry,
1869 ADDR("instantiate-rtas"),
1870 rtas_inst, base) != 0
1872 prom_printf(" failed\n");
1875 prom_printf(" done\n");
1877 reserve_mem(base, size);
1879 val = cpu_to_be32(base);
1880 prom_setprop(rtas_node, "/rtas", "linux,rtas-base",
1882 val = cpu_to_be32(entry);
1883 prom_setprop(rtas_node, "/rtas", "linux,rtas-entry",
1886 /* Check if it supports "query-cpu-stopped-state" */
1887 if (prom_getprop(rtas_node, "query-cpu-stopped-state",
1888 &val, sizeof(val)) != PROM_ERROR)
1889 rtas_has_query_cpu_stopped = true;
1891 prom_debug("rtas base = 0x%x\n", base);
1892 prom_debug("rtas entry = 0x%x\n", entry);
1893 prom_debug("rtas size = 0x%x\n", size);
1895 prom_debug("prom_instantiate_rtas: end...\n");
1900 * Allocate room for and instantiate Stored Measurement Log (SML)
1902 static void __init prom_instantiate_sml(void)
1904 phandle ibmvtpm_node;
1905 ihandle ibmvtpm_inst;
1906 u32 entry = 0, size = 0, succ = 0;
1910 prom_debug("prom_instantiate_sml: start...\n");
1912 ibmvtpm_node = call_prom("finddevice", 1, 1, ADDR("/vdevice/vtpm"));
1913 prom_debug("ibmvtpm_node: %x\n", ibmvtpm_node);
1914 if (!PHANDLE_VALID(ibmvtpm_node))
1917 ibmvtpm_inst = call_prom("open", 1, 1, ADDR("/vdevice/vtpm"));
1918 if (!IHANDLE_VALID(ibmvtpm_inst)) {
1919 prom_printf("opening vtpm package failed (%x)\n", ibmvtpm_inst);
1923 if (prom_getprop(ibmvtpm_node, "ibm,sml-efi-reformat-supported",
1924 &val, sizeof(val)) != PROM_ERROR) {
1925 if (call_prom_ret("call-method", 2, 2, &succ,
1926 ADDR("reformat-sml-to-efi-alignment"),
1927 ibmvtpm_inst) != 0 || succ == 0) {
1928 prom_printf("Reformat SML to EFI alignment failed\n");
1932 if (call_prom_ret("call-method", 2, 2, &size,
1933 ADDR("sml-get-allocated-size"),
1934 ibmvtpm_inst) != 0 || size == 0) {
1935 prom_printf("SML get allocated size failed\n");
1939 if (call_prom_ret("call-method", 2, 2, &size,
1940 ADDR("sml-get-handover-size"),
1941 ibmvtpm_inst) != 0 || size == 0) {
1942 prom_printf("SML get handover size failed\n");
1947 base = alloc_down(size, PAGE_SIZE, 0);
1949 prom_panic("Could not allocate memory for sml\n");
1951 prom_printf("instantiating sml at 0x%llx...", base);
1953 memset((void *)base, 0, size);
1955 if (call_prom_ret("call-method", 4, 2, &entry,
1956 ADDR("sml-handover"),
1957 ibmvtpm_inst, size, base) != 0 || entry == 0) {
1958 prom_printf("SML handover failed\n");
1961 prom_printf(" done\n");
1963 reserve_mem(base, size);
1965 prom_setprop(ibmvtpm_node, "/vdevice/vtpm", "linux,sml-base",
1966 &base, sizeof(base));
1967 prom_setprop(ibmvtpm_node, "/vdevice/vtpm", "linux,sml-size",
1968 &size, sizeof(size));
1970 prom_debug("sml base = 0x%llx\n", base);
1971 prom_debug("sml size = 0x%x\n", size);
1973 prom_debug("prom_instantiate_sml: end...\n");
1977 * Allocate room for and initialize TCE tables
1979 #ifdef __BIG_ENDIAN__
1980 static void __init prom_initialize_tce_table(void)
1984 char compatible[64], type[64], model[64];
1985 char *path = prom_scratch;
1987 u32 minalign, minsize;
1988 u64 tce_entry, *tce_entryp;
1989 u64 local_alloc_top, local_alloc_bottom;
1995 prom_debug("starting prom_initialize_tce_table\n");
1997 /* Cache current top of allocs so we reserve a single block */
1998 local_alloc_top = alloc_top_high;
1999 local_alloc_bottom = local_alloc_top;
2001 /* Search all nodes looking for PHBs. */
2002 for (node = 0; prom_next_node(&node); ) {
2006 prom_getprop(node, "compatible",
2007 compatible, sizeof(compatible));
2008 prom_getprop(node, "device_type", type, sizeof(type));
2009 prom_getprop(node, "model", model, sizeof(model));
2011 if ((type[0] == 0) || (prom_strstr(type, "pci") == NULL))
2014 /* Keep the old logic intact to avoid regression. */
2015 if (compatible[0] != 0) {
2016 if ((prom_strstr(compatible, "python") == NULL) &&
2017 (prom_strstr(compatible, "Speedwagon") == NULL) &&
2018 (prom_strstr(compatible, "Winnipeg") == NULL))
2020 } else if (model[0] != 0) {
2021 if ((prom_strstr(model, "ython") == NULL) &&
2022 (prom_strstr(model, "peedwagon") == NULL) &&
2023 (prom_strstr(model, "innipeg") == NULL))
2027 if (prom_getprop(node, "tce-table-minalign", &minalign,
2028 sizeof(minalign)) == PROM_ERROR)
2030 if (prom_getprop(node, "tce-table-minsize", &minsize,
2031 sizeof(minsize)) == PROM_ERROR)
2032 minsize = 4UL << 20;
2035 * Even though we read what OF wants, we just set the table
2036 * size to 4 MB. This is enough to map 2GB of PCI DMA space.
2037 * By doing this, we avoid the pitfalls of trying to DMA to
2038 * MMIO space and the DMA alias hole.
2040 minsize = 4UL << 20;
2042 /* Align to the greater of the align or size */
2043 align = max(minalign, minsize);
2044 base = alloc_down(minsize, align, 1);
2046 prom_panic("ERROR, cannot find space for TCE table.\n");
2047 if (base < local_alloc_bottom)
2048 local_alloc_bottom = base;
2050 /* It seems OF doesn't null-terminate the path :-( */
2051 memset(path, 0, sizeof(prom_scratch));
2052 /* Call OF to setup the TCE hardware */
2053 if (call_prom("package-to-path", 3, 1, node,
2054 path, sizeof(prom_scratch) - 1) == PROM_ERROR) {
2055 prom_printf("package-to-path failed\n");
2058 /* Save away the TCE table attributes for later use. */
2059 prom_setprop(node, path, "linux,tce-base", &base, sizeof(base));
2060 prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize));
2062 prom_debug("TCE table: %s\n", path);
2063 prom_debug("\tnode = 0x%x\n", node);
2064 prom_debug("\tbase = 0x%llx\n", base);
2065 prom_debug("\tsize = 0x%x\n", minsize);
2067 /* Initialize the table to have a one-to-one mapping
2068 * over the allocated size.
2070 tce_entryp = (u64 *)base;
2071 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) {
2072 tce_entry = (i << PAGE_SHIFT);
2074 *tce_entryp = tce_entry;
2077 prom_printf("opening PHB %s", path);
2078 phb_node = call_prom("open", 1, 1, path);
2080 prom_printf("... failed\n");
2082 prom_printf("... done\n");
2084 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
2085 phb_node, -1, minsize,
2086 (u32) base, (u32) (base >> 32));
2087 call_prom("close", 1, 0, phb_node);
2090 reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);
2092 /* These are only really needed if there is a memory limit in
2093 * effect, but we don't know so export them always. */
2094 prom_tce_alloc_start = local_alloc_bottom;
2095 prom_tce_alloc_end = local_alloc_top;
2097 /* Flag the first invalid entry */
2098 prom_debug("ending prom_initialize_tce_table\n");
2100 #endif /* __BIG_ENDIAN__ */
2101 #endif /* CONFIG_PPC64 */
2104 * With CHRP SMP we need to use the OF to start the other processors.
2105 * We can't wait until smp_boot_cpus (the OF is trashed by then)
2106 * so we have to put the processors into a holding pattern controlled
2107 * by the kernel (not OF) before we destroy the OF.
2109 * This uses a chunk of low memory, puts some holding pattern
2110 * code there and sends the other processors off to there until
2111 * smp_boot_cpus tells them to do something. The holding pattern
2112 * checks that address until its cpu # is there, when it is that
2113 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care
2114 * of setting those values.
2116 * We also use physical address 0x4 here to tell when a cpu
2117 * is in its holding pattern code.
2122 * We want to reference the copy of __secondary_hold_* in the
2123 * 0 - 0x100 address range
2125 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff)
2127 static void __init prom_hold_cpus(void)
2132 unsigned long *spinloop
2133 = (void *) LOW_ADDR(__secondary_hold_spinloop);
2134 unsigned long *acknowledge
2135 = (void *) LOW_ADDR(__secondary_hold_acknowledge);
2136 unsigned long secondary_hold = LOW_ADDR(__secondary_hold);
2139 * On pseries, if RTAS supports "query-cpu-stopped-state",
2140 * we skip this stage, the CPUs will be started by the
2141 * kernel using RTAS.
2143 if ((of_platform == PLATFORM_PSERIES ||
2144 of_platform == PLATFORM_PSERIES_LPAR) &&
2145 rtas_has_query_cpu_stopped) {
2146 prom_printf("prom_hold_cpus: skipped\n");
2150 prom_debug("prom_hold_cpus: start...\n");
2151 prom_debug(" 1) spinloop = 0x%lx\n", (unsigned long)spinloop);
2152 prom_debug(" 1) *spinloop = 0x%lx\n", *spinloop);
2153 prom_debug(" 1) acknowledge = 0x%lx\n",
2154 (unsigned long)acknowledge);
2155 prom_debug(" 1) *acknowledge = 0x%lx\n", *acknowledge);
2156 prom_debug(" 1) secondary_hold = 0x%lx\n", secondary_hold);
2158 /* Set the common spinloop variable, so all of the secondary cpus
2159 * will block when they are awakened from their OF spinloop.
2160 * This must occur for both SMP and non SMP kernels, since OF will
2161 * be trashed when we move the kernel.
2166 for (node = 0; prom_next_node(&node); ) {
2167 unsigned int cpu_no;
2171 prom_getprop(node, "device_type", type, sizeof(type));
2172 if (prom_strcmp(type, "cpu") != 0)
2175 /* Skip non-configured cpus. */
2176 if (prom_getprop(node, "status", type, sizeof(type)) > 0)
2177 if (prom_strcmp(type, "okay") != 0)
2180 reg = cpu_to_be32(-1); /* make sparse happy */
2181 prom_getprop(node, "reg", ®, sizeof(reg));
2182 cpu_no = be32_to_cpu(reg);
2184 prom_debug("cpu hw idx = %u\n", cpu_no);
2186 /* Init the acknowledge var which will be reset by
2187 * the secondary cpu when it awakens from its OF
2190 *acknowledge = (unsigned long)-1;
2192 if (cpu_no != prom.cpu) {
2193 /* Primary Thread of non-boot cpu or any thread */
2194 prom_printf("starting cpu hw idx %u... ", cpu_no);
2195 call_prom("start-cpu", 3, 0, node,
2196 secondary_hold, cpu_no);
2198 for (i = 0; (i < 100000000) &&
2199 (*acknowledge == ((unsigned long)-1)); i++ )
2202 if (*acknowledge == cpu_no)
2203 prom_printf("done\n");
2205 prom_printf("failed: %lx\n", *acknowledge);
2209 prom_printf("boot cpu hw idx %u\n", cpu_no);
2210 #endif /* CONFIG_SMP */
2213 prom_debug("prom_hold_cpus: end...\n");
2217 static void __init prom_init_client_services(unsigned long pp)
2219 /* Get a handle to the prom entry point before anything else */
2222 /* get a handle for the stdout device */
2223 prom.chosen = call_prom("finddevice", 1, 1, ADDR("/chosen"));
2224 if (!PHANDLE_VALID(prom.chosen))
2225 prom_panic("cannot find chosen"); /* msg won't be printed :( */
2227 /* get device tree root */
2228 prom.root = call_prom("finddevice", 1, 1, ADDR("/"));
2229 if (!PHANDLE_VALID(prom.root))
2230 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
2237 * For really old powermacs, we need to map things we claim.
2238 * For that, we need the ihandle of the mmu.
2239 * Also, on the longtrail, we need to work around other bugs.
2241 static void __init prom_find_mmu(void)
2246 oprom = call_prom("finddevice", 1, 1, ADDR("/openprom"));
2247 if (!PHANDLE_VALID(oprom))
2249 if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0)
2251 version[sizeof(version) - 1] = 0;
2252 /* XXX might need to add other versions here */
2253 if (prom_strcmp(version, "Open Firmware, 1.0.5") == 0)
2254 of_workarounds = OF_WA_CLAIM;
2255 else if (prom_strncmp(version, "FirmWorks,3.", 12) == 0) {
2256 of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL;
2257 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
2260 prom.memory = call_prom("open", 1, 1, ADDR("/memory"));
2261 prom_getprop(prom.chosen, "mmu", &prom.mmumap,
2262 sizeof(prom.mmumap));
2263 prom.mmumap = be32_to_cpu(prom.mmumap);
2264 if (!IHANDLE_VALID(prom.memory) || !IHANDLE_VALID(prom.mmumap))
2265 of_workarounds &= ~OF_WA_CLAIM; /* hmmm */
2268 #define prom_find_mmu()
2271 static void __init prom_init_stdout(void)
2273 char *path = of_stdout_device;
2275 phandle stdout_node;
2278 if (prom_getprop(prom.chosen, "stdout", &val, sizeof(val)) <= 0)
2279 prom_panic("cannot find stdout");
2281 prom.stdout = be32_to_cpu(val);
2283 /* Get the full OF pathname of the stdout device */
2284 memset(path, 0, 256);
2285 call_prom("instance-to-path", 3, 1, prom.stdout, path, 255);
2286 prom_printf("OF stdout device is: %s\n", of_stdout_device);
2287 prom_setprop(prom.chosen, "/chosen", "linux,stdout-path",
2288 path, prom_strlen(path) + 1);
2290 /* instance-to-package fails on PA-Semi */
2291 stdout_node = call_prom("instance-to-package", 1, 1, prom.stdout);
2292 if (stdout_node != PROM_ERROR) {
2293 val = cpu_to_be32(stdout_node);
2295 /* If it's a display, note it */
2296 memset(type, 0, sizeof(type));
2297 prom_getprop(stdout_node, "device_type", type, sizeof(type));
2298 if (prom_strcmp(type, "display") == 0)
2299 prom_setprop(stdout_node, path, "linux,boot-display", NULL, 0);
2303 static int __init prom_find_machine_type(void)
2312 /* Look for a PowerMac or a Cell */
2313 len = prom_getprop(prom.root, "compatible",
2314 compat, sizeof(compat)-1);
2318 char *p = &compat[i];
2319 int sl = prom_strlen(p);
2322 if (prom_strstr(p, "Power Macintosh") ||
2323 prom_strstr(p, "MacRISC"))
2324 return PLATFORM_POWERMAC;
2326 /* We must make sure we don't detect the IBM Cell
2327 * blades as pSeries due to some firmware issues,
2330 if (prom_strstr(p, "IBM,CBEA") ||
2331 prom_strstr(p, "IBM,CPBW-1.0"))
2332 return PLATFORM_GENERIC;
2333 #endif /* CONFIG_PPC64 */
2338 /* Try to figure out if it's an IBM pSeries or any other
2339 * PAPR compliant platform. We assume it is if :
2340 * - /device_type is "chrp" (please, do NOT use that for future
2344 len = prom_getprop(prom.root, "device_type",
2345 compat, sizeof(compat)-1);
2347 return PLATFORM_GENERIC;
2348 if (prom_strcmp(compat, "chrp"))
2349 return PLATFORM_GENERIC;
2351 /* Default to pSeries. We need to know if we are running LPAR */
2352 rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
2353 if (!PHANDLE_VALID(rtas))
2354 return PLATFORM_GENERIC;
2355 x = prom_getproplen(rtas, "ibm,hypertas-functions");
2356 if (x != PROM_ERROR) {
2357 prom_debug("Hypertas detected, assuming LPAR !\n");
2358 return PLATFORM_PSERIES_LPAR;
2360 return PLATFORM_PSERIES;
2362 return PLATFORM_GENERIC;
2366 static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
2368 return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);
2372 * If we have a display that we don't know how to drive,
2373 * we will want to try to execute OF's open method for it
2374 * later. However, OF will probably fall over if we do that
2375 * we've taken over the MMU.
2376 * So we check whether we will need to open the display,
2377 * and if so, open it now.
2379 static void __init prom_check_displays(void)
2381 char type[16], *path;
2386 static const unsigned char default_colors[] __initconst = {
2404 const unsigned char *clut;
2406 prom_debug("Looking for displays\n");
2407 for (node = 0; prom_next_node(&node); ) {
2408 memset(type, 0, sizeof(type));
2409 prom_getprop(node, "device_type", type, sizeof(type));
2410 if (prom_strcmp(type, "display") != 0)
2413 /* It seems OF doesn't null-terminate the path :-( */
2414 path = prom_scratch;
2415 memset(path, 0, sizeof(prom_scratch));
2418 * leave some room at the end of the path for appending extra
2421 if (call_prom("package-to-path", 3, 1, node, path,
2422 sizeof(prom_scratch) - 10) == PROM_ERROR)
2424 prom_printf("found display : %s, opening... ", path);
2426 ih = call_prom("open", 1, 1, path);
2428 prom_printf("failed\n");
2433 prom_printf("done\n");
2434 prom_setprop(node, path, "linux,opened", NULL, 0);
2436 /* Setup a usable color table when the appropriate
2437 * method is available. Should update this to set-colors */
2438 clut = default_colors;
2439 for (i = 0; i < 16; i++, clut += 3)
2440 if (prom_set_color(ih, i, clut[0], clut[1],
2444 #ifdef CONFIG_LOGO_LINUX_CLUT224
2445 clut = PTRRELOC(logo_linux_clut224.clut);
2446 for (i = 0; i < logo_linux_clut224.clutsize; i++, clut += 3)
2447 if (prom_set_color(ih, i + 32, clut[0], clut[1],
2450 #endif /* CONFIG_LOGO_LINUX_CLUT224 */
2452 #ifdef CONFIG_PPC_EARLY_DEBUG_BOOTX
2453 if (prom_getprop(node, "linux,boot-display", NULL, 0) !=
2455 u32 width, height, pitch, addr;
2457 prom_printf("Setting btext !\n");
2459 if (prom_getprop(node, "width", &width, 4) == PROM_ERROR)
2462 if (prom_getprop(node, "height", &height, 4) == PROM_ERROR)
2465 if (prom_getprop(node, "linebytes", &pitch, 4) == PROM_ERROR)
2468 if (prom_getprop(node, "address", &addr, 4) == PROM_ERROR)
2471 prom_printf("W=%d H=%d LB=%d addr=0x%x\n",
2472 width, height, pitch, addr);
2473 btext_setup_display(width, height, 8, pitch, addr);
2474 btext_prepare_BAT();
2476 #endif /* CONFIG_PPC_EARLY_DEBUG_BOOTX */
2481 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */
2482 static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end,
2483 unsigned long needed, unsigned long align)
2487 *mem_start = ALIGN(*mem_start, align);
2488 while ((*mem_start + needed) > *mem_end) {
2489 unsigned long room, chunk;
2491 prom_debug("Chunk exhausted, claiming more at %lx...\n",
2493 room = alloc_top - alloc_bottom;
2494 if (room > DEVTREE_CHUNK_SIZE)
2495 room = DEVTREE_CHUNK_SIZE;
2496 if (room < PAGE_SIZE)
2497 prom_panic("No memory for flatten_device_tree "
2499 chunk = alloc_up(room, 0);
2501 prom_panic("No memory for flatten_device_tree "
2502 "(claim failed)\n");
2503 *mem_end = chunk + room;
2506 ret = (void *)*mem_start;
2507 *mem_start += needed;
2512 #define dt_push_token(token, mem_start, mem_end) do { \
2513 void *room = make_room(mem_start, mem_end, 4, 4); \
2514 *(__be32 *)room = cpu_to_be32(token); \
2517 static unsigned long __init dt_find_string(char *str)
2521 s = os = (char *)dt_string_start;
2523 while (s < (char *)dt_string_end) {
2524 if (prom_strcmp(s, str) == 0)
2526 s += prom_strlen(s) + 1;
2532 * The Open Firmware 1275 specification states properties must be 31 bytes or
2533 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
2535 #define MAX_PROPERTY_NAME 64
2537 static void __init scan_dt_build_strings(phandle node,
2538 unsigned long *mem_start,
2539 unsigned long *mem_end)
2541 char *prev_name, *namep, *sstart;
2545 sstart = (char *)dt_string_start;
2547 /* get and store all property names */
2550 /* 64 is max len of name including nul. */
2551 namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1);
2552 if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) {
2553 /* No more nodes: unwind alloc */
2554 *mem_start = (unsigned long)namep;
2559 if (prom_strcmp(namep, "name") == 0) {
2560 *mem_start = (unsigned long)namep;
2564 /* get/create string entry */
2565 soff = dt_find_string(namep);
2567 *mem_start = (unsigned long)namep;
2568 namep = sstart + soff;
2570 /* Trim off some if we can */
2571 *mem_start = (unsigned long)namep + prom_strlen(namep) + 1;
2572 dt_string_end = *mem_start;
2577 /* do all our children */
2578 child = call_prom("child", 1, 1, node);
2579 while (child != 0) {
2580 scan_dt_build_strings(child, mem_start, mem_end);
2581 child = call_prom("peer", 1, 1, child);
2585 static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
2586 unsigned long *mem_end)
2589 char *namep, *prev_name, *sstart, *p, *ep, *lp, *path;
2591 unsigned char *valp;
2592 static char pname[MAX_PROPERTY_NAME] __prombss;
2593 int l, room, has_phandle = 0;
2595 dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);
2597 /* get the node's full name */
2598 namep = (char *)*mem_start;
2599 room = *mem_end - *mem_start;
2602 l = call_prom("package-to-path", 3, 1, node, namep, room);
2604 /* Didn't fit? Get more room. */
2606 if (l >= *mem_end - *mem_start)
2607 namep = make_room(mem_start, mem_end, l+1, 1);
2608 call_prom("package-to-path", 3, 1, node, namep, l);
2612 /* Fixup an Apple bug where they have bogus \0 chars in the
2613 * middle of the path in some properties, and extract
2614 * the unit name (everything after the last '/').
2616 for (lp = p = namep, ep = namep + l; p < ep; p++) {
2623 *mem_start = ALIGN((unsigned long)lp + 1, 4);
2626 /* get it again for debugging */
2627 path = prom_scratch;
2628 memset(path, 0, sizeof(prom_scratch));
2629 call_prom("package-to-path", 3, 1, node, path, sizeof(prom_scratch) - 1);
2631 /* get and store all properties */
2633 sstart = (char *)dt_string_start;
2635 if (call_prom("nextprop", 3, 1, node, prev_name,
2640 if (prom_strcmp(pname, "name") == 0) {
2645 /* find string offset */
2646 soff = dt_find_string(pname);
2648 prom_printf("WARNING: Can't find string index for"
2649 " <%s>, node %s\n", pname, path);
2652 prev_name = sstart + soff;
2655 l = call_prom("getproplen", 2, 1, node, pname);
2658 if (l == PROM_ERROR)
2661 /* push property head */
2662 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2663 dt_push_token(l, mem_start, mem_end);
2664 dt_push_token(soff, mem_start, mem_end);
2666 /* push property content */
2667 valp = make_room(mem_start, mem_end, l, 4);
2668 call_prom("getprop", 4, 1, node, pname, valp, l);
2669 *mem_start = ALIGN(*mem_start, 4);
2671 if (!prom_strcmp(pname, "phandle"))
2675 /* Add a "phandle" property if none already exist */
2677 soff = dt_find_string("phandle");
2679 prom_printf("WARNING: Can't find string index for <phandle> node %s\n", path);
2681 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2682 dt_push_token(4, mem_start, mem_end);
2683 dt_push_token(soff, mem_start, mem_end);
2684 valp = make_room(mem_start, mem_end, 4, 4);
2685 *(__be32 *)valp = cpu_to_be32(node);
2689 /* do all our children */
2690 child = call_prom("child", 1, 1, node);
2691 while (child != 0) {
2692 scan_dt_build_struct(child, mem_start, mem_end);
2693 child = call_prom("peer", 1, 1, child);
2696 dt_push_token(OF_DT_END_NODE, mem_start, mem_end);
2699 static void __init flatten_device_tree(void)
2702 unsigned long mem_start, mem_end, room;
2703 struct boot_param_header *hdr;
2708 * Check how much room we have between alloc top & bottom (+/- a
2709 * few pages), crop to 1MB, as this is our "chunk" size
2711 room = alloc_top - alloc_bottom - 0x4000;
2712 if (room > DEVTREE_CHUNK_SIZE)
2713 room = DEVTREE_CHUNK_SIZE;
2714 prom_debug("starting device tree allocs at %lx\n", alloc_bottom);
2716 /* Now try to claim that */
2717 mem_start = (unsigned long)alloc_up(room, PAGE_SIZE);
2719 prom_panic("Can't allocate initial device-tree chunk\n");
2720 mem_end = mem_start + room;
2722 /* Get root of tree */
2723 root = call_prom("peer", 1, 1, (phandle)0);
2724 if (root == (phandle)0)
2725 prom_panic ("couldn't get device tree root\n");
2727 /* Build header and make room for mem rsv map */
2728 mem_start = ALIGN(mem_start, 4);
2729 hdr = make_room(&mem_start, &mem_end,
2730 sizeof(struct boot_param_header), 4);
2731 dt_header_start = (unsigned long)hdr;
2732 rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8);
2734 /* Start of strings */
2735 mem_start = PAGE_ALIGN(mem_start);
2736 dt_string_start = mem_start;
2737 mem_start += 4; /* hole */
2739 /* Add "phandle" in there, we'll need it */
2740 namep = make_room(&mem_start, &mem_end, 16, 1);
2741 prom_strscpy_pad(namep, "phandle", sizeof("phandle"));
2742 mem_start = (unsigned long)namep + prom_strlen(namep) + 1;
2744 /* Build string array */
2745 prom_printf("Building dt strings...\n");
2746 scan_dt_build_strings(root, &mem_start, &mem_end);
2747 dt_string_end = mem_start;
2749 /* Build structure */
2750 mem_start = PAGE_ALIGN(mem_start);
2751 dt_struct_start = mem_start;
2752 prom_printf("Building dt structure...\n");
2753 scan_dt_build_struct(root, &mem_start, &mem_end);
2754 dt_push_token(OF_DT_END, &mem_start, &mem_end);
2755 dt_struct_end = PAGE_ALIGN(mem_start);
2758 hdr->boot_cpuid_phys = cpu_to_be32(prom.cpu);
2759 hdr->magic = cpu_to_be32(OF_DT_HEADER);
2760 hdr->totalsize = cpu_to_be32(dt_struct_end - dt_header_start);
2761 hdr->off_dt_struct = cpu_to_be32(dt_struct_start - dt_header_start);
2762 hdr->off_dt_strings = cpu_to_be32(dt_string_start - dt_header_start);
2763 hdr->dt_strings_size = cpu_to_be32(dt_string_end - dt_string_start);
2764 hdr->off_mem_rsvmap = cpu_to_be32(((unsigned long)rsvmap) - dt_header_start);
2765 hdr->version = cpu_to_be32(OF_DT_VERSION);
2766 /* Version 16 is not backward compatible */
2767 hdr->last_comp_version = cpu_to_be32(0x10);
2769 /* Copy the reserve map in */
2770 memcpy(rsvmap, mem_reserve_map, sizeof(mem_reserve_map));
2775 prom_printf("reserved memory map:\n");
2776 for (i = 0; i < mem_reserve_cnt; i++)
2777 prom_printf(" %llx - %llx\n",
2778 be64_to_cpu(mem_reserve_map[i].base),
2779 be64_to_cpu(mem_reserve_map[i].size));
2782 /* Bump mem_reserve_cnt to cause further reservations to fail
2783 * since it's too late.
2785 mem_reserve_cnt = MEM_RESERVE_MAP_SIZE;
2787 prom_printf("Device tree strings 0x%lx -> 0x%lx\n",
2788 dt_string_start, dt_string_end);
2789 prom_printf("Device tree struct 0x%lx -> 0x%lx\n",
2790 dt_struct_start, dt_struct_end);
2793 #ifdef CONFIG_PPC_MAPLE
2794 /* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property.
2795 * The values are bad, and it doesn't even have the right number of cells. */
2796 static void __init fixup_device_tree_maple(void)
2799 u32 rloc = 0x01002000; /* IO space; PCI device = 4 */
2803 name = "/ht@0/isa@4";
2804 isa = call_prom("finddevice", 1, 1, ADDR(name));
2805 if (!PHANDLE_VALID(isa)) {
2806 name = "/ht@0/isa@6";
2807 isa = call_prom("finddevice", 1, 1, ADDR(name));
2808 rloc = 0x01003000; /* IO space; PCI device = 6 */
2810 if (!PHANDLE_VALID(isa))
2813 if (prom_getproplen(isa, "ranges") != 12)
2815 if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges))
2819 if (isa_ranges[0] != 0x1 ||
2820 isa_ranges[1] != 0xf4000000 ||
2821 isa_ranges[2] != 0x00010000)
2824 prom_printf("Fixing up bogus ISA range on Maple/Apache...\n");
2826 isa_ranges[0] = 0x1;
2827 isa_ranges[1] = 0x0;
2828 isa_ranges[2] = rloc;
2829 isa_ranges[3] = 0x0;
2830 isa_ranges[4] = 0x0;
2831 isa_ranges[5] = 0x00010000;
2832 prom_setprop(isa, name, "ranges",
2833 isa_ranges, sizeof(isa_ranges));
2836 #define CPC925_MC_START 0xf8000000
2837 #define CPC925_MC_LENGTH 0x1000000
2838 /* The values for memory-controller don't have right number of cells */
2839 static void __init fixup_device_tree_maple_memory_controller(void)
2843 char *name = "/hostbridge@f8000000";
2846 mc = call_prom("finddevice", 1, 1, ADDR(name));
2847 if (!PHANDLE_VALID(mc))
2850 if (prom_getproplen(mc, "reg") != 8)
2853 prom_getprop(prom.root, "#address-cells", &ac, sizeof(ac));
2854 prom_getprop(prom.root, "#size-cells", &sc, sizeof(sc));
2855 if ((ac != 2) || (sc != 2))
2858 if (prom_getprop(mc, "reg", mc_reg, sizeof(mc_reg)) == PROM_ERROR)
2861 if (mc_reg[0] != CPC925_MC_START || mc_reg[1] != CPC925_MC_LENGTH)
2864 prom_printf("Fixing up bogus hostbridge on Maple...\n");
2867 mc_reg[1] = CPC925_MC_START;
2869 mc_reg[3] = CPC925_MC_LENGTH;
2870 prom_setprop(mc, name, "reg", mc_reg, sizeof(mc_reg));
2873 #define fixup_device_tree_maple()
2874 #define fixup_device_tree_maple_memory_controller()
2877 #ifdef CONFIG_PPC_CHRP
2879 * Pegasos and BriQ lacks the "ranges" property in the isa node
2880 * Pegasos needs decimal IRQ 14/15, not hexadecimal
2881 * Pegasos has the IDE configured in legacy mode, but advertised as native
2883 static void __init fixup_device_tree_chrp(void)
2887 u32 rloc = 0x01006000; /* IO space; PCI device = 12 */
2891 name = "/pci@80000000/isa@c";
2892 ph = call_prom("finddevice", 1, 1, ADDR(name));
2893 if (!PHANDLE_VALID(ph)) {
2894 name = "/pci@ff500000/isa@6";
2895 ph = call_prom("finddevice", 1, 1, ADDR(name));
2896 rloc = 0x01003000; /* IO space; PCI device = 6 */
2898 if (PHANDLE_VALID(ph)) {
2899 rc = prom_getproplen(ph, "ranges");
2900 if (rc == 0 || rc == PROM_ERROR) {
2901 prom_printf("Fixing up missing ISA range on Pegasos...\n");
2908 prop[5] = 0x00010000;
2909 prom_setprop(ph, name, "ranges", prop, sizeof(prop));
2913 name = "/pci@80000000/ide@C,1";
2914 ph = call_prom("finddevice", 1, 1, ADDR(name));
2915 if (PHANDLE_VALID(ph)) {
2916 prom_printf("Fixing up IDE interrupt on Pegasos...\n");
2919 prom_setprop(ph, name, "interrupts", prop, 2*sizeof(u32));
2920 prom_printf("Fixing up IDE class-code on Pegasos...\n");
2921 rc = prom_getprop(ph, "class-code", prop, sizeof(u32));
2922 if (rc == sizeof(u32)) {
2924 prom_setprop(ph, name, "class-code", prop, sizeof(u32));
2929 #define fixup_device_tree_chrp()
2932 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
2933 static void __init fixup_device_tree_pmac(void)
2935 phandle u3, i2c, mpic;
2940 /* Some G5s have a missing interrupt definition, fix it up here */
2941 u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
2942 if (!PHANDLE_VALID(u3))
2944 i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
2945 if (!PHANDLE_VALID(i2c))
2947 mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
2948 if (!PHANDLE_VALID(mpic))
2951 /* check if proper rev of u3 */
2952 if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev))
2955 if (u3_rev < 0x35 || u3_rev > 0x39)
2957 /* does it need fixup ? */
2958 if (prom_getproplen(i2c, "interrupts") > 0)
2961 prom_printf("fixing up bogus interrupts for u3 i2c...\n");
2963 /* interrupt on this revision of u3 is number 0 and level */
2966 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts",
2967 &interrupts, sizeof(interrupts));
2969 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
2970 &parent, sizeof(parent));
2973 #define fixup_device_tree_pmac()
2976 #ifdef CONFIG_PPC_EFIKA
2978 * The MPC5200 FEC driver requires an phy-handle property to tell it how
2979 * to talk to the phy. If the phy-handle property is missing, then this
2980 * function is called to add the appropriate nodes and link it to the
2983 static void __init fixup_device_tree_efika_add_phy(void)
2989 /* Check if /builtin/ethernet exists - bail if it doesn't */
2990 node = call_prom("finddevice", 1, 1, ADDR("/builtin/ethernet"));
2991 if (!PHANDLE_VALID(node))
2994 /* Check if the phy-handle property exists - bail if it does */
2995 rv = prom_getprop(node, "phy-handle", prop, sizeof(prop));
3000 * At this point the ethernet device doesn't have a phy described.
3001 * Now we need to add the missing phy node and linkage
3004 /* Check for an MDIO bus node - if missing then create one */
3005 node = call_prom("finddevice", 1, 1, ADDR("/builtin/mdio"));
3006 if (!PHANDLE_VALID(node)) {
3007 prom_printf("Adding Ethernet MDIO node\n");
3008 call_prom("interpret", 1, 1,
3009 " s\" /builtin\" find-device"
3011 " 1 encode-int s\" #address-cells\" property"
3012 " 0 encode-int s\" #size-cells\" property"
3013 " s\" mdio\" device-name"
3014 " s\" fsl,mpc5200b-mdio\" encode-string"
3015 " s\" compatible\" property"
3016 " 0xf0003000 0x400 reg"
3018 " 0x5 encode-int encode+"
3019 " 0x3 encode-int encode+"
3020 " s\" interrupts\" property"
3024 /* Check for a PHY device node - if missing then create one and
3025 * give it's phandle to the ethernet node */
3026 node = call_prom("finddevice", 1, 1,
3027 ADDR("/builtin/mdio/ethernet-phy"));
3028 if (!PHANDLE_VALID(node)) {
3029 prom_printf("Adding Ethernet PHY node\n");
3030 call_prom("interpret", 1, 1,
3031 " s\" /builtin/mdio\" find-device"
3033 " s\" ethernet-phy\" device-name"
3034 " 0x10 encode-int s\" reg\" property"
3038 " s\" /builtin/ethernet\" find-device"
3040 " s\" phy-handle\" property"
3045 static void __init fixup_device_tree_efika(void)
3047 int sound_irq[3] = { 2, 2, 0 };
3048 int bcomm_irq[3*16] = { 3,0,0, 3,1,0, 3,2,0, 3,3,0,
3049 3,4,0, 3,5,0, 3,6,0, 3,7,0,
3050 3,8,0, 3,9,0, 3,10,0, 3,11,0,
3051 3,12,0, 3,13,0, 3,14,0, 3,15,0 };
3056 /* Check if we're really running on a EFIKA */
3057 node = call_prom("finddevice", 1, 1, ADDR("/"));
3058 if (!PHANDLE_VALID(node))
3061 rv = prom_getprop(node, "model", prop, sizeof(prop));
3062 if (rv == PROM_ERROR)
3064 if (prom_strcmp(prop, "EFIKA5K2"))
3067 prom_printf("Applying EFIKA device tree fixups\n");
3069 /* Claiming to be 'chrp' is death */
3070 node = call_prom("finddevice", 1, 1, ADDR("/"));
3071 rv = prom_getprop(node, "device_type", prop, sizeof(prop));
3072 if (rv != PROM_ERROR && (prom_strcmp(prop, "chrp") == 0))
3073 prom_setprop(node, "/", "device_type", "efika", sizeof("efika"));
3075 /* CODEGEN,description is exposed in /proc/cpuinfo so
3077 rv = prom_getprop(node, "CODEGEN,description", prop, sizeof(prop));
3078 if (rv != PROM_ERROR && (prom_strstr(prop, "CHRP")))
3079 prom_setprop(node, "/", "CODEGEN,description",
3080 "Efika 5200B PowerPC System",
3081 sizeof("Efika 5200B PowerPC System"));
3083 /* Fixup bestcomm interrupts property */
3084 node = call_prom("finddevice", 1, 1, ADDR("/builtin/bestcomm"));
3085 if (PHANDLE_VALID(node)) {
3086 len = prom_getproplen(node, "interrupts");
3088 prom_printf("Fixing bestcomm interrupts property\n");
3089 prom_setprop(node, "/builtin/bestcom", "interrupts",
3090 bcomm_irq, sizeof(bcomm_irq));
3094 /* Fixup sound interrupts property */
3095 node = call_prom("finddevice", 1, 1, ADDR("/builtin/sound"));
3096 if (PHANDLE_VALID(node)) {
3097 rv = prom_getprop(node, "interrupts", prop, sizeof(prop));
3098 if (rv == PROM_ERROR) {
3099 prom_printf("Adding sound interrupts property\n");
3100 prom_setprop(node, "/builtin/sound", "interrupts",
3101 sound_irq, sizeof(sound_irq));
3105 /* Make sure ethernet phy-handle property exists */
3106 fixup_device_tree_efika_add_phy();
3109 #define fixup_device_tree_efika()
3112 #ifdef CONFIG_PPC_PASEMI_NEMO
3114 * CFE supplied on Nemo is broken in several ways, biggest
3115 * problem is that it reassigns ISA interrupts to unused mpic ints.
3116 * Add an interrupt-controller property for the io-bridge to use
3117 * and correct the ints so we can attach them to an irq_domain
3119 static void __init fixup_device_tree_pasemi(void)
3121 u32 interrupts[2], parent, rval, val = 0;
3122 char *name, *pci_name;
3125 /* Find the root pci node */
3126 name = "/pxp@0,e0000000";
3127 iob = call_prom("finddevice", 1, 1, ADDR(name));
3128 if (!PHANDLE_VALID(iob))
3131 /* check if interrupt-controller node set yet */
3132 if (prom_getproplen(iob, "interrupt-controller") !=PROM_ERROR)
3135 prom_printf("adding interrupt-controller property for SB600...\n");
3137 prom_setprop(iob, name, "interrupt-controller", &val, 0);
3139 pci_name = "/pxp@0,e0000000/pci@11";
3140 node = call_prom("finddevice", 1, 1, ADDR(pci_name));
3143 for( ; prom_next_node(&node); ) {
3144 /* scan each node for one with an interrupt */
3145 if (!PHANDLE_VALID(node))
3148 rval = prom_getproplen(node, "interrupts");
3149 if (rval == 0 || rval == PROM_ERROR)
3152 prom_getprop(node, "interrupts", &interrupts, sizeof(interrupts));
3153 if ((interrupts[0] < 212) || (interrupts[0] > 222))
3156 /* found a node, update both interrupts and interrupt-parent */
3157 if ((interrupts[0] >= 212) && (interrupts[0] <= 215))
3158 interrupts[0] -= 203;
3159 if ((interrupts[0] >= 216) && (interrupts[0] <= 220))
3160 interrupts[0] -= 213;
3161 if (interrupts[0] == 221)
3163 if (interrupts[0] == 222)
3166 prom_setprop(node, pci_name, "interrupts", interrupts,
3167 sizeof(interrupts));
3168 prom_setprop(node, pci_name, "interrupt-parent", &parent,
3173 * The io-bridge has device_type set to 'io-bridge' change it to 'isa'
3174 * so that generic isa-bridge code can add the SB600 and its on-board
3177 name = "/pxp@0,e0000000/io-bridge@0";
3178 iob = call_prom("finddevice", 1, 1, ADDR(name));
3179 if (!PHANDLE_VALID(iob))
3182 /* device_type is already set, just change it. */
3184 prom_printf("Changing device_type of SB600 node...\n");
3186 prom_setprop(iob, name, "device_type", "isa", sizeof("isa"));
3188 #else /* !CONFIG_PPC_PASEMI_NEMO */
3189 static inline void fixup_device_tree_pasemi(void) { }
3192 static void __init fixup_device_tree(void)
3194 fixup_device_tree_maple();
3195 fixup_device_tree_maple_memory_controller();
3196 fixup_device_tree_chrp();
3197 fixup_device_tree_pmac();
3198 fixup_device_tree_efika();
3199 fixup_device_tree_pasemi();
3202 static void __init prom_find_boot_cpu(void)
3209 if (prom_getprop(prom.chosen, "cpu", &rval, sizeof(rval)) <= 0)
3211 prom_cpu = be32_to_cpu(rval);
3213 cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);
3215 if (!PHANDLE_VALID(cpu_pkg))
3218 prom_getprop(cpu_pkg, "reg", &rval, sizeof(rval));
3219 prom.cpu = be32_to_cpu(rval);
3221 prom_debug("Booting CPU hw index = %d\n", prom.cpu);
3224 static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
3226 #ifdef CONFIG_BLK_DEV_INITRD
3227 if (r3 && r4 && r4 != 0xdeadbeef) {
3230 prom_initrd_start = is_kernel_addr(r3) ? __pa(r3) : r3;
3231 prom_initrd_end = prom_initrd_start + r4;
3233 val = cpu_to_be64(prom_initrd_start);
3234 prom_setprop(prom.chosen, "/chosen", "linux,initrd-start",
3236 val = cpu_to_be64(prom_initrd_end);
3237 prom_setprop(prom.chosen, "/chosen", "linux,initrd-end",
3240 reserve_mem(prom_initrd_start,
3241 prom_initrd_end - prom_initrd_start);
3243 prom_debug("initrd_start=0x%lx\n", prom_initrd_start);
3244 prom_debug("initrd_end=0x%lx\n", prom_initrd_end);
3246 #endif /* CONFIG_BLK_DEV_INITRD */
3249 #ifdef CONFIG_PPC_SVM
3251 * Perform the Enter Secure Mode ultracall.
3253 static int __init enter_secure_mode(unsigned long kbase, unsigned long fdt)
3255 register unsigned long r3 asm("r3") = UV_ESM;
3256 register unsigned long r4 asm("r4") = kbase;
3257 register unsigned long r5 asm("r5") = fdt;
3259 asm volatile("sc 2" : "+r"(r3) : "r"(r4), "r"(r5));
3265 * Call the Ultravisor to transfer us to secure memory if we have an ESM blob.
3267 static void __init setup_secure_guest(unsigned long kbase, unsigned long fdt)
3271 if (!prom_svm_enable)
3274 /* Switch to secure mode. */
3275 prom_printf("Switching to secure mode.\n");
3278 * The ultravisor will do an integrity check of the kernel image but we
3279 * relocated it so the check will fail. Restore the original image by
3280 * relocating it back to the kernel virtual base address.
3282 relocate(KERNELBASE);
3284 ret = enter_secure_mode(kbase, fdt);
3286 /* Relocate the kernel again. */
3289 if (ret != U_SUCCESS) {
3290 prom_printf("Returned %d from switching to secure mode.\n", ret);
3291 prom_rtas_os_term("Switch to secure mode failed.\n");
3295 static void __init setup_secure_guest(unsigned long kbase, unsigned long fdt)
3298 #endif /* CONFIG_PPC_SVM */
3301 * We enter here early on, when the Open Firmware prom is still
3302 * handling exceptions and the MMU hash table for us.
3305 unsigned long __init prom_init(unsigned long r3, unsigned long r4,
3307 unsigned long r6, unsigned long r7,
3308 unsigned long kbase)
3313 unsigned long offset = reloc_offset();
3318 * First zero the BSS
3320 memset(&__bss_start, 0, __bss_stop - __bss_start);
3323 * Init interface to Open Firmware, get some node references,
3326 prom_init_client_services(pp);
3329 * See if this OF is old enough that we need to do explicit maps
3330 * and other workarounds
3335 * Init prom stdout device
3339 prom_printf("Preparing to boot %s", linux_banner);
3342 * Get default machine type. At this point, we do not differentiate
3343 * between pSeries SMP and pSeries LPAR
3345 of_platform = prom_find_machine_type();
3346 prom_printf("Detected machine type: %x\n", of_platform);
3348 #ifndef CONFIG_NONSTATIC_KERNEL
3349 /* Bail if this is a kdump kernel. */
3350 if (PHYSICAL_START > 0)
3351 prom_panic("Error: You can't boot a kdump kernel from OF!\n");
3355 * Check for an initrd
3357 prom_check_initrd(r3, r4);
3360 * Do early parsing of command line
3362 early_cmdline_parse();
3364 #ifdef CONFIG_PPC_PSERIES
3366 * On pSeries, inform the firmware about our capabilities
3368 if (of_platform == PLATFORM_PSERIES ||
3369 of_platform == PLATFORM_PSERIES_LPAR)
3370 prom_send_capabilities();
3374 * Copy the CPU hold code
3376 if (of_platform != PLATFORM_POWERMAC)
3377 copy_and_flush(0, kbase, 0x100, 0);
3380 * Initialize memory management within prom_init
3385 * Determine which cpu is actually running right _now_
3387 prom_find_boot_cpu();
3390 * Initialize display devices
3392 prom_check_displays();
3394 #if defined(CONFIG_PPC64) && defined(__BIG_ENDIAN__)
3396 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
3397 * that uses the allocator, we need to make sure we get the top of memory
3398 * available for us here...
3400 if (of_platform == PLATFORM_PSERIES)
3401 prom_initialize_tce_table();
3405 * On non-powermacs, try to instantiate RTAS. PowerMacs don't
3406 * have a usable RTAS implementation.
3408 if (of_platform != PLATFORM_POWERMAC)
3409 prom_instantiate_rtas();
3412 /* instantiate sml */
3413 prom_instantiate_sml();
3417 * On non-powermacs, put all CPUs in spin-loops.
3419 * PowerMacs use a different mechanism to spin CPUs
3421 * (This must be done after instantiating RTAS)
3423 if (of_platform != PLATFORM_POWERMAC)
3427 * Fill in some infos for use by the kernel later on
3429 if (prom_memory_limit) {
3430 __be64 val = cpu_to_be64(prom_memory_limit);
3431 prom_setprop(prom.chosen, "/chosen", "linux,memory-limit",
3436 prom_setprop(prom.chosen, "/chosen", "linux,iommu-off",
3439 if (prom_iommu_force_on)
3440 prom_setprop(prom.chosen, "/chosen", "linux,iommu-force-on",
3443 if (prom_tce_alloc_start) {
3444 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-start",
3445 &prom_tce_alloc_start,
3446 sizeof(prom_tce_alloc_start));
3447 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-end",
3448 &prom_tce_alloc_end,
3449 sizeof(prom_tce_alloc_end));
3454 * Fixup any known bugs in the device-tree
3456 fixup_device_tree();
3459 * Now finally create the flattened device-tree
3461 prom_printf("copying OF device tree...\n");
3462 flatten_device_tree();
3465 * in case stdin is USB and still active on IBM machines...
3466 * Unfortunately quiesce crashes on some powermacs if we have
3467 * closed stdin already (in particular the powerbook 101).
3469 if (of_platform != PLATFORM_POWERMAC)
3473 * Call OF "quiesce" method to shut down pending DMA's from
3476 prom_printf("Quiescing Open Firmware ...\n");
3477 call_prom("quiesce", 0, 0);
3480 * And finally, call the kernel passing it the flattened device
3481 * tree and NULL as r5, thus triggering the new entry point which
3482 * is common to us and kexec
3484 hdr = dt_header_start;
3486 prom_printf("Booting Linux via __start() @ 0x%lx ...\n", kbase);
3487 prom_debug("->dt_header_start=0x%lx\n", hdr);
3490 reloc_got2(-offset);
3493 /* Move to secure memory if we're supposed to be secure guests. */
3494 setup_secure_guest(kbase, hdr);
3496 __start(hdr, kbase, 0, 0, 0, 0, 0);