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 */
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>
32 #include <asm/processor.h>
37 #include <asm/pgtable.h>
38 #include <asm/iommu.h>
39 #include <asm/btext.h>
40 #include <asm/sections.h>
41 #include <asm/machdep.h>
42 #include <asm/asm-prototypes.h>
43 #include <asm/ultravisor-api.h>
45 #include <linux/linux_logo.h>
47 /* All of prom_init bss lives here */
48 #define __prombss __section(.bss.prominit)
51 * Eventually bump that one up
53 #define DEVTREE_CHUNK_SIZE 0x100000
56 * This is the size of the local memory reserve map that gets copied
57 * into the boot params passed to the kernel. That size is totally
58 * flexible as the kernel just reads the list until it encounters an
59 * entry with size 0, so it can be changed without breaking binary
62 #define MEM_RESERVE_MAP_SIZE 8
65 * prom_init() is called very early on, before the kernel text
66 * and data have been mapped to KERNELBASE. At this point the code
67 * is running at whatever address it has been loaded at.
68 * On ppc32 we compile with -mrelocatable, which means that references
69 * to extern and static variables get relocated automatically.
70 * ppc64 objects are always relocatable, we just need to relocate the
73 * Because OF may have mapped I/O devices into the area starting at
74 * KERNELBASE, particularly on CHRP machines, we can't safely call
75 * OF once the kernel has been mapped to KERNELBASE. Therefore all
76 * OF calls must be done within prom_init().
78 * ADDR is used in calls to call_prom. The 4th and following
79 * arguments to call_prom should be 32-bit values.
80 * On ppc64, 64 bit values are truncated to 32 bits (and
81 * fortunately don't get interpreted as two arguments).
83 #define ADDR(x) (u32)(unsigned long)(x)
86 #define OF_WORKAROUNDS 0
88 #define OF_WORKAROUNDS of_workarounds
89 static int of_workarounds __prombss;
92 #define OF_WA_CLAIM 1 /* do phys/virt claim separately, then map */
93 #define OF_WA_LONGTRAIL 2 /* work around longtrail bugs */
95 #define PROM_BUG() do { \
96 prom_printf("kernel BUG at %s line 0x%x!\n", \
97 __FILE__, __LINE__); \
102 #define prom_debug(x...) prom_printf(x)
104 #define prom_debug(x...) do { } while (0)
108 typedef u32 prom_arg_t;
126 struct mem_map_entry {
131 typedef __be32 cell_t;
133 extern void __start(unsigned long r3, unsigned long r4, unsigned long r5,
134 unsigned long r6, unsigned long r7, unsigned long r8,
138 extern int enter_prom(struct prom_args *args, unsigned long entry);
140 static inline int enter_prom(struct prom_args *args, unsigned long entry)
142 return ((int (*)(struct prom_args *))entry)(args);
146 extern void copy_and_flush(unsigned long dest, unsigned long src,
147 unsigned long size, unsigned long offset);
150 static struct prom_t __prombss prom;
152 static unsigned long __prombss prom_entry;
154 static char __prombss of_stdout_device[256];
155 static char __prombss prom_scratch[256];
157 static unsigned long __prombss dt_header_start;
158 static unsigned long __prombss dt_struct_start, dt_struct_end;
159 static unsigned long __prombss dt_string_start, dt_string_end;
161 static unsigned long __prombss prom_initrd_start, prom_initrd_end;
164 static int __prombss prom_iommu_force_on;
165 static int __prombss prom_iommu_off;
166 static unsigned long __prombss prom_tce_alloc_start;
167 static unsigned long __prombss prom_tce_alloc_end;
170 #ifdef CONFIG_PPC_PSERIES
171 static bool __prombss prom_radix_disable;
172 static bool __prombss prom_xive_disable;
175 #ifdef CONFIG_PPC_SVM
176 static bool __prombss prom_svm_enable;
179 struct platform_support {
186 /* Platforms codes are now obsolete in the kernel. Now only used within this
187 * file and ultimately gone too. Feel free to change them if you need, they
188 * are not shared with anything outside of this file anymore
190 #define PLATFORM_PSERIES 0x0100
191 #define PLATFORM_PSERIES_LPAR 0x0101
192 #define PLATFORM_LPAR 0x0001
193 #define PLATFORM_POWERMAC 0x0400
194 #define PLATFORM_GENERIC 0x0500
196 static int __prombss of_platform;
198 static char __prombss prom_cmd_line[COMMAND_LINE_SIZE];
200 static unsigned long __prombss prom_memory_limit;
202 static unsigned long __prombss alloc_top;
203 static unsigned long __prombss alloc_top_high;
204 static unsigned long __prombss alloc_bottom;
205 static unsigned long __prombss rmo_top;
206 static unsigned long __prombss ram_top;
208 static struct mem_map_entry __prombss mem_reserve_map[MEM_RESERVE_MAP_SIZE];
209 static int __prombss mem_reserve_cnt;
211 static cell_t __prombss regbuf[1024];
213 static bool __prombss rtas_has_query_cpu_stopped;
217 * Error results ... some OF calls will return "-1" on error, some
218 * will return 0, some will return either. To simplify, here are
219 * macros to use with any ihandle or phandle return value to check if
223 #define PROM_ERROR (-1u)
224 #define PHANDLE_VALID(p) ((p) != 0 && (p) != PROM_ERROR)
225 #define IHANDLE_VALID(i) ((i) != 0 && (i) != PROM_ERROR)
227 /* Copied from lib/string.c and lib/kstrtox.c */
229 static int __init prom_strcmp(const char *cs, const char *ct)
231 unsigned char c1, c2;
237 return c1 < c2 ? -1 : 1;
244 static char __init *prom_strcpy(char *dest, const char *src)
248 while ((*dest++ = *src++) != '\0')
253 static int __init prom_strncmp(const char *cs, const char *ct, size_t count)
255 unsigned char c1, c2;
261 return c1 < c2 ? -1 : 1;
269 static size_t __init prom_strlen(const char *s)
273 for (sc = s; *sc != '\0'; ++sc)
278 static int __init prom_memcmp(const void *cs, const void *ct, size_t count)
280 const unsigned char *su1, *su2;
283 for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
284 if ((res = *su1 - *su2) != 0)
289 static char __init *prom_strstr(const char *s1, const char *s2)
293 l2 = prom_strlen(s2);
296 l1 = prom_strlen(s1);
299 if (!prom_memcmp(s1, s2, l2))
306 static size_t __init prom_strlcat(char *dest, const char *src, size_t count)
308 size_t dsize = prom_strlen(dest);
309 size_t len = prom_strlen(src);
310 size_t res = dsize + len;
312 /* This would be a bug */
320 memcpy(dest, src, len);
326 #ifdef CONFIG_PPC_PSERIES
327 static int __init prom_strtobool(const char *s, bool *res)
365 /* This is the one and *ONLY* place where we actually call open
369 static int __init call_prom(const char *service, int nargs, int nret, ...)
372 struct prom_args args;
375 args.service = cpu_to_be32(ADDR(service));
376 args.nargs = cpu_to_be32(nargs);
377 args.nret = cpu_to_be32(nret);
379 va_start(list, nret);
380 for (i = 0; i < nargs; i++)
381 args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));
384 for (i = 0; i < nret; i++)
385 args.args[nargs+i] = 0;
387 if (enter_prom(&args, prom_entry) < 0)
390 return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;
393 static int __init call_prom_ret(const char *service, int nargs, int nret,
394 prom_arg_t *rets, ...)
397 struct prom_args args;
400 args.service = cpu_to_be32(ADDR(service));
401 args.nargs = cpu_to_be32(nargs);
402 args.nret = cpu_to_be32(nret);
404 va_start(list, rets);
405 for (i = 0; i < nargs; i++)
406 args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));
409 for (i = 0; i < nret; i++)
410 args.args[nargs+i] = 0;
412 if (enter_prom(&args, prom_entry) < 0)
416 for (i = 1; i < nret; ++i)
417 rets[i-1] = be32_to_cpu(args.args[nargs+i]);
419 return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;
423 static void __init prom_print(const char *msg)
427 if (prom.stdout == 0)
430 for (p = msg; *p != 0; p = q) {
431 for (q = p; *q != 0 && *q != '\n'; ++q)
434 call_prom("write", 3, 1, prom.stdout, p, q - p);
438 call_prom("write", 3, 1, prom.stdout, ADDR("\r\n"), 2);
444 * Both prom_print_hex & prom_print_dec takes an unsigned long as input so that
445 * we do not need __udivdi3 or __umoddi3 on 32bits.
447 static void __init prom_print_hex(unsigned long val)
449 int i, nibbles = sizeof(val)*2;
450 char buf[sizeof(val)*2+1];
452 for (i = nibbles-1; i >= 0; i--) {
453 buf[i] = (val & 0xf) + '0';
455 buf[i] += ('a'-'0'-10);
459 call_prom("write", 3, 1, prom.stdout, buf, nibbles);
462 /* max number of decimal digits in an unsigned long */
464 static void __init prom_print_dec(unsigned long val)
467 char buf[UL_DIGITS+1];
469 for (i = UL_DIGITS-1; i >= 0; i--) {
470 buf[i] = (val % 10) + '0';
475 /* shift stuff down */
476 size = UL_DIGITS - i;
477 call_prom("write", 3, 1, prom.stdout, buf+i, size);
481 static void __init prom_printf(const char *format, ...)
483 const char *p, *q, *s;
489 va_start(args, format);
490 for (p = format; *p != 0; p = q) {
491 for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
494 call_prom("write", 3, 1, prom.stdout, p, q - p);
499 call_prom("write", 3, 1, prom.stdout,
513 s = va_arg(args, const char *);
520 v = va_arg(args, unsigned int);
523 v = va_arg(args, unsigned long);
527 v = va_arg(args, unsigned long long);
536 v = va_arg(args, unsigned int);
539 v = va_arg(args, unsigned long);
543 v = va_arg(args, unsigned long long);
552 vs = va_arg(args, int);
555 vs = va_arg(args, long);
559 vs = va_arg(args, long long);
574 static unsigned int __init prom_claim(unsigned long virt, unsigned long size,
578 if (align == 0 && (OF_WORKAROUNDS & OF_WA_CLAIM)) {
580 * Old OF requires we claim physical and virtual separately
581 * and then map explicitly (assuming virtual mode)
586 ret = call_prom_ret("call-method", 5, 2, &result,
587 ADDR("claim"), prom.memory,
589 if (ret != 0 || result == -1)
591 ret = call_prom_ret("call-method", 5, 2, &result,
592 ADDR("claim"), prom.mmumap,
595 call_prom("call-method", 4, 1, ADDR("release"),
596 prom.memory, size, virt);
599 /* the 0x12 is M (coherence) + PP == read/write */
600 call_prom("call-method", 6, 1,
601 ADDR("map"), prom.mmumap, 0x12, size, virt, virt);
604 return call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size,
608 static void __init __attribute__((noreturn)) prom_panic(const char *reason)
611 /* Do not call exit because it clears the screen on pmac
612 * it also causes some sort of double-fault on early pmacs */
613 if (of_platform == PLATFORM_POWERMAC)
616 /* ToDo: should put up an SRC here on pSeries */
617 call_prom("exit", 0, 0);
619 for (;;) /* should never get here */
624 static int __init prom_next_node(phandle *nodep)
628 if ((node = *nodep) != 0
629 && (*nodep = call_prom("child", 1, 1, node)) != 0)
631 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
634 if ((node = call_prom("parent", 1, 1, node)) == 0)
636 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
641 static inline int __init prom_getprop(phandle node, const char *pname,
642 void *value, size_t valuelen)
644 return call_prom("getprop", 4, 1, node, ADDR(pname),
645 (u32)(unsigned long) value, (u32) valuelen);
648 static inline int __init prom_getproplen(phandle node, const char *pname)
650 return call_prom("getproplen", 2, 1, node, ADDR(pname));
653 static void add_string(char **str, const char *q)
663 static char *tohex(unsigned int x)
665 static const char digits[] __initconst = "0123456789abcdef";
666 static char result[9] __prombss;
673 result[i] = digits[x & 0xf];
675 } while (x != 0 && i > 0);
679 static int __init prom_setprop(phandle node, const char *nodename,
680 const char *pname, void *value, size_t valuelen)
684 if (!(OF_WORKAROUNDS & OF_WA_LONGTRAIL))
685 return call_prom("setprop", 4, 1, node, ADDR(pname),
686 (u32)(unsigned long) value, (u32) valuelen);
688 /* gah... setprop doesn't work on longtrail, have to use interpret */
690 add_string(&p, "dev");
691 add_string(&p, nodename);
692 add_string(&p, tohex((u32)(unsigned long) value));
693 add_string(&p, tohex(valuelen));
694 add_string(&p, tohex(ADDR(pname)));
695 add_string(&p, tohex(prom_strlen(pname)));
696 add_string(&p, "property");
698 return call_prom("interpret", 1, 1, (u32)(unsigned long) cmd);
701 /* We can't use the standard versions because of relocation headaches. */
702 #define isxdigit(c) (('0' <= (c) && (c) <= '9') \
703 || ('a' <= (c) && (c) <= 'f') \
704 || ('A' <= (c) && (c) <= 'F'))
706 #define isdigit(c) ('0' <= (c) && (c) <= '9')
707 #define islower(c) ('a' <= (c) && (c) <= 'z')
708 #define toupper(c) (islower(c) ? ((c) - 'a' + 'A') : (c))
710 static unsigned long prom_strtoul(const char *cp, const char **endp)
712 unsigned long result = 0, base = 10, value;
717 if (toupper(*cp) == 'X') {
723 while (isxdigit(*cp) &&
724 (value = isdigit(*cp) ? *cp - '0' : toupper(*cp) - 'A' + 10) < base) {
725 result = result * base + value;
735 static unsigned long prom_memparse(const char *ptr, const char **retptr)
737 unsigned long ret = prom_strtoul(ptr, retptr);
741 * We can't use a switch here because GCC *may* generate a
742 * jump table which won't work, because we're not running at
743 * the address we're linked at.
745 if ('G' == **retptr || 'g' == **retptr)
748 if ('M' == **retptr || 'm' == **retptr)
751 if ('K' == **retptr || 'k' == **retptr)
763 * Early parsing of the command line passed to the kernel, used for
764 * "mem=x" and the options that affect the iommu
766 static void __init early_cmdline_parse(void)
773 prom_cmd_line[0] = 0;
776 if (!IS_ENABLED(CONFIG_CMDLINE_FORCE) && (long)prom.chosen > 0)
777 l = prom_getprop(prom.chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
779 if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) || l <= 0 || p[0] == '\0')
780 prom_strlcat(prom_cmd_line, " " CONFIG_CMDLINE,
781 sizeof(prom_cmd_line));
783 prom_printf("command line: %s\n", prom_cmd_line);
786 opt = prom_strstr(prom_cmd_line, "iommu=");
788 prom_printf("iommu opt is: %s\n", opt);
790 while (*opt && *opt == ' ')
792 if (!prom_strncmp(opt, "off", 3))
794 else if (!prom_strncmp(opt, "force", 5))
795 prom_iommu_force_on = 1;
798 opt = prom_strstr(prom_cmd_line, "mem=");
801 prom_memory_limit = prom_memparse(opt, (const char **)&opt);
803 /* Align to 16 MB == size of ppc64 large page */
804 prom_memory_limit = ALIGN(prom_memory_limit, 0x1000000);
808 #ifdef CONFIG_PPC_PSERIES
809 prom_radix_disable = !IS_ENABLED(CONFIG_PPC_RADIX_MMU_DEFAULT);
810 opt = prom_strstr(prom_cmd_line, "disable_radix");
813 if (*opt && *opt == '=') {
816 if (prom_strtobool(++opt, &val))
817 prom_radix_disable = false;
819 prom_radix_disable = val;
821 prom_radix_disable = true;
823 if (prom_radix_disable)
824 prom_debug("Radix disabled from cmdline\n");
826 opt = prom_strstr(prom_cmd_line, "xive=off");
828 prom_xive_disable = true;
829 prom_debug("XIVE disabled from cmdline\n");
831 #endif /* CONFIG_PPC_PSERIES */
833 #ifdef CONFIG_PPC_SVM
834 opt = prom_strstr(prom_cmd_line, "svm=");
838 opt += sizeof("svm=") - 1;
839 if (!prom_strtobool(opt, &val))
840 prom_svm_enable = val;
842 #endif /* CONFIG_PPC_SVM */
845 #ifdef CONFIG_PPC_PSERIES
847 * The architecture vector has an array of PVR mask/value pairs,
848 * followed by # option vectors - 1, followed by the option vectors.
850 * See prom.h for the definition of the bits specified in the
851 * architecture vector.
854 /* Firmware expects the value to be n - 1, where n is the # of vectors */
855 #define NUM_VECTORS(n) ((n) - 1)
858 * Firmware expects 1 + n - 2, where n is the length of the option vector in
859 * bytes. The 1 accounts for the length byte itself, the - 2 .. ?
861 #define VECTOR_LENGTH(n) (1 + (n) - 2)
863 struct option_vector1 {
869 struct option_vector2 {
883 struct option_vector3 {
888 struct option_vector4 {
893 struct option_vector5 {
905 u8 platform_facilities;
916 struct option_vector6 {
922 struct ibm_arch_vec {
923 struct { u32 mask, val; } pvrs[12];
928 struct option_vector1 vec1;
931 struct option_vector2 vec2;
934 struct option_vector3 vec3;
937 struct option_vector4 vec4;
940 struct option_vector5 vec5;
943 struct option_vector6 vec6;
946 static const struct ibm_arch_vec ibm_architecture_vec_template __initconst = {
949 .mask = cpu_to_be32(0xfffe0000), /* POWER5/POWER5+ */
950 .val = cpu_to_be32(0x003a0000),
953 .mask = cpu_to_be32(0xffff0000), /* POWER6 */
954 .val = cpu_to_be32(0x003e0000),
957 .mask = cpu_to_be32(0xffff0000), /* POWER7 */
958 .val = cpu_to_be32(0x003f0000),
961 .mask = cpu_to_be32(0xffff0000), /* POWER8E */
962 .val = cpu_to_be32(0x004b0000),
965 .mask = cpu_to_be32(0xffff0000), /* POWER8NVL */
966 .val = cpu_to_be32(0x004c0000),
969 .mask = cpu_to_be32(0xffff0000), /* POWER8 */
970 .val = cpu_to_be32(0x004d0000),
973 .mask = cpu_to_be32(0xffff0000), /* POWER9 */
974 .val = cpu_to_be32(0x004e0000),
977 .mask = cpu_to_be32(0xffffffff), /* all 3.00-compliant */
978 .val = cpu_to_be32(0x0f000005),
981 .mask = cpu_to_be32(0xffffffff), /* all 2.07-compliant */
982 .val = cpu_to_be32(0x0f000004),
985 .mask = cpu_to_be32(0xffffffff), /* all 2.06-compliant */
986 .val = cpu_to_be32(0x0f000003),
989 .mask = cpu_to_be32(0xffffffff), /* all 2.05-compliant */
990 .val = cpu_to_be32(0x0f000002),
993 .mask = cpu_to_be32(0xfffffffe), /* all 2.04-compliant and earlier */
994 .val = cpu_to_be32(0x0f000001),
998 .num_vectors = NUM_VECTORS(6),
1000 .vec1_len = VECTOR_LENGTH(sizeof(struct option_vector1)),
1003 .arch_versions = OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 |
1004 OV1_PPC_2_04 | OV1_PPC_2_05 | OV1_PPC_2_06 | OV1_PPC_2_07,
1005 .arch_versions3 = OV1_PPC_3_00,
1008 .vec2_len = VECTOR_LENGTH(sizeof(struct option_vector2)),
1009 /* option vector 2: Open Firmware options supported */
1011 .byte1 = OV2_REAL_MODE,
1013 .real_base = cpu_to_be32(0xffffffff),
1014 .real_size = cpu_to_be32(0xffffffff),
1015 .virt_base = cpu_to_be32(0xffffffff),
1016 .virt_size = cpu_to_be32(0xffffffff),
1017 .load_base = cpu_to_be32(0xffffffff),
1018 .min_rma = cpu_to_be32(512), /* 512MB min RMA */
1019 .min_load = cpu_to_be32(0xffffffff), /* full client load */
1020 .min_rma_percent = 0, /* min RMA percentage of total RAM */
1021 .max_pft_size = 48, /* max log_2(hash table size) */
1024 .vec3_len = VECTOR_LENGTH(sizeof(struct option_vector3)),
1025 /* option vector 3: processor options supported */
1027 .byte1 = 0, /* don't ignore, don't halt */
1028 .byte2 = OV3_FP | OV3_VMX | OV3_DFP,
1031 .vec4_len = VECTOR_LENGTH(sizeof(struct option_vector4)),
1032 /* option vector 4: IBM PAPR implementation */
1034 .byte1 = 0, /* don't halt */
1035 .min_vp_cap = OV4_MIN_ENT_CAP, /* minimum VP entitled capacity */
1038 .vec5_len = VECTOR_LENGTH(sizeof(struct option_vector5)),
1039 /* option vector 5: PAPR/OF options */
1041 .byte1 = 0, /* don't ignore, don't halt */
1042 .byte2 = OV5_FEAT(OV5_LPAR) | OV5_FEAT(OV5_SPLPAR) | OV5_FEAT(OV5_LARGE_PAGES) |
1043 OV5_FEAT(OV5_DRCONF_MEMORY) | OV5_FEAT(OV5_DONATE_DEDICATE_CPU) |
1044 #ifdef CONFIG_PCI_MSI
1045 /* PCIe/MSI support. Without MSI full PCIe is not supported */
1052 #ifdef CONFIG_PPC_SMLPAR
1053 OV5_FEAT(OV5_CMO) | OV5_FEAT(OV5_XCMO),
1057 .associativity = OV5_FEAT(OV5_TYPE1_AFFINITY) | OV5_FEAT(OV5_PRRN),
1058 .bin_opts = OV5_FEAT(OV5_RESIZE_HPT) | OV5_FEAT(OV5_HP_EVT),
1059 .micro_checkpoint = 0,
1061 .max_cpus = cpu_to_be32(NR_CPUS), /* number of cores supported */
1064 .platform_facilities = OV5_FEAT(OV5_PFO_HW_RNG) | OV5_FEAT(OV5_PFO_HW_ENCR) | OV5_FEAT(OV5_PFO_HW_842),
1068 .byte22 = OV5_FEAT(OV5_DRMEM_V2) | OV5_FEAT(OV5_DRC_INFO),
1075 /* option vector 6: IBM PAPR hints */
1076 .vec6_len = VECTOR_LENGTH(sizeof(struct option_vector6)),
1079 .secondary_pteg = 0,
1080 .os_name = OV6_LINUX,
1084 static struct ibm_arch_vec __prombss ibm_architecture_vec ____cacheline_aligned;
1086 /* Old method - ELF header with PT_NOTE sections only works on BE */
1087 #ifdef __BIG_ENDIAN__
1088 static const struct fake_elf {
1095 char name[8]; /* "PowerPC" */
1109 char name[24]; /* "IBM,RPA-Client-Config" */
1113 u32 min_rmo_percent;
1121 } fake_elf __initconst = {
1123 .e_ident = { 0x7f, 'E', 'L', 'F',
1124 ELFCLASS32, ELFDATA2MSB, EV_CURRENT },
1125 .e_type = ET_EXEC, /* yeah right */
1126 .e_machine = EM_PPC,
1127 .e_version = EV_CURRENT,
1128 .e_phoff = offsetof(struct fake_elf, phdr),
1129 .e_phentsize = sizeof(Elf32_Phdr),
1135 .p_offset = offsetof(struct fake_elf, chrpnote),
1136 .p_filesz = sizeof(struct chrpnote)
1139 .p_offset = offsetof(struct fake_elf, rpanote),
1140 .p_filesz = sizeof(struct rpanote)
1144 .namesz = sizeof("PowerPC"),
1145 .descsz = sizeof(struct chrpdesc),
1149 .real_mode = ~0U, /* ~0 means "don't care" */
1158 .namesz = sizeof("IBM,RPA-Client-Config"),
1159 .descsz = sizeof(struct rpadesc),
1161 .name = "IBM,RPA-Client-Config",
1164 .min_rmo_size = 64, /* in megabytes */
1165 .min_rmo_percent = 0,
1166 .max_pft_size = 48, /* 2^48 bytes max PFT size */
1173 #endif /* __BIG_ENDIAN__ */
1175 static int __init prom_count_smt_threads(void)
1181 /* Pick up th first CPU node we can find */
1182 for (node = 0; prom_next_node(&node); ) {
1184 prom_getprop(node, "device_type", type, sizeof(type));
1186 if (prom_strcmp(type, "cpu"))
1189 * There is an entry for each smt thread, each entry being
1190 * 4 bytes long. All cpus should have the same number of
1191 * smt threads, so return after finding the first.
1193 plen = prom_getproplen(node, "ibm,ppc-interrupt-server#s");
1194 if (plen == PROM_ERROR)
1197 prom_debug("Found %lu smt threads per core\n", (unsigned long)plen);
1200 if (plen < 1 || plen > 64) {
1201 prom_printf("Threads per core %lu out of bounds, assuming 1\n",
1202 (unsigned long)plen);
1207 prom_debug("No threads found, assuming 1 per core\n");
1213 static void __init prom_parse_mmu_model(u8 val,
1214 struct platform_support *support)
1217 case OV5_FEAT(OV5_MMU_DYNAMIC):
1218 case OV5_FEAT(OV5_MMU_EITHER): /* Either Available */
1219 prom_debug("MMU - either supported\n");
1220 support->radix_mmu = !prom_radix_disable;
1221 support->hash_mmu = true;
1223 case OV5_FEAT(OV5_MMU_RADIX): /* Only Radix */
1224 prom_debug("MMU - radix only\n");
1225 if (prom_radix_disable) {
1227 * If we __have__ to do radix, we're better off ignoring
1228 * the command line rather than not booting.
1230 prom_printf("WARNING: Ignoring cmdline option disable_radix\n");
1232 support->radix_mmu = true;
1234 case OV5_FEAT(OV5_MMU_HASH):
1235 prom_debug("MMU - hash only\n");
1236 support->hash_mmu = true;
1239 prom_debug("Unknown mmu support option: 0x%x\n", val);
1244 static void __init prom_parse_xive_model(u8 val,
1245 struct platform_support *support)
1248 case OV5_FEAT(OV5_XIVE_EITHER): /* Either Available */
1249 prom_debug("XIVE - either mode supported\n");
1250 support->xive = !prom_xive_disable;
1252 case OV5_FEAT(OV5_XIVE_EXPLOIT): /* Only Exploitation mode */
1253 prom_debug("XIVE - exploitation mode supported\n");
1254 if (prom_xive_disable) {
1256 * If we __have__ to do XIVE, we're better off ignoring
1257 * the command line rather than not booting.
1259 prom_printf("WARNING: Ignoring cmdline option xive=off\n");
1261 support->xive = true;
1263 case OV5_FEAT(OV5_XIVE_LEGACY): /* Only Legacy mode */
1264 prom_debug("XIVE - legacy mode supported\n");
1267 prom_debug("Unknown xive support option: 0x%x\n", val);
1272 static void __init prom_parse_platform_support(u8 index, u8 val,
1273 struct platform_support *support)
1276 case OV5_INDX(OV5_MMU_SUPPORT): /* MMU Model */
1277 prom_parse_mmu_model(val & OV5_FEAT(OV5_MMU_SUPPORT), support);
1279 case OV5_INDX(OV5_RADIX_GTSE): /* Radix Extensions */
1280 if (val & OV5_FEAT(OV5_RADIX_GTSE)) {
1281 prom_debug("Radix - GTSE supported\n");
1282 support->radix_gtse = true;
1285 case OV5_INDX(OV5_XIVE_SUPPORT): /* Interrupt mode */
1286 prom_parse_xive_model(val & OV5_FEAT(OV5_XIVE_SUPPORT),
1292 static void __init prom_check_platform_support(void)
1294 struct platform_support supported = {
1297 .radix_gtse = false,
1300 int prop_len = prom_getproplen(prom.chosen,
1301 "ibm,arch-vec-5-platform-support");
1304 * First copy the architecture vec template
1306 * use memcpy() instead of *vec = *vec_template so that GCC replaces it
1307 * by __memcpy() when KASAN is active
1309 memcpy(&ibm_architecture_vec, &ibm_architecture_vec_template,
1310 sizeof(ibm_architecture_vec));
1315 prom_debug("Found ibm,arch-vec-5-platform-support, len: %d\n",
1317 if (prop_len > sizeof(vec))
1318 prom_printf("WARNING: ibm,arch-vec-5-platform-support longer than expected (len: %d)\n",
1320 prom_getprop(prom.chosen, "ibm,arch-vec-5-platform-support",
1322 for (i = 0; i < sizeof(vec); i += 2) {
1323 prom_debug("%d: index = 0x%x val = 0x%x\n", i / 2
1326 prom_parse_platform_support(vec[i], vec[i + 1],
1331 if (supported.radix_mmu && supported.radix_gtse &&
1332 IS_ENABLED(CONFIG_PPC_RADIX_MMU)) {
1333 /* Radix preferred - but we require GTSE for now */
1334 prom_debug("Asking for radix with GTSE\n");
1335 ibm_architecture_vec.vec5.mmu = OV5_FEAT(OV5_MMU_RADIX);
1336 ibm_architecture_vec.vec5.radix_ext = OV5_FEAT(OV5_RADIX_GTSE);
1337 } else if (supported.hash_mmu) {
1338 /* Default to hash mmu (if we can) */
1339 prom_debug("Asking for hash\n");
1340 ibm_architecture_vec.vec5.mmu = OV5_FEAT(OV5_MMU_HASH);
1342 /* We're probably on a legacy hypervisor */
1343 prom_debug("Assuming legacy hash support\n");
1346 if (supported.xive) {
1347 prom_debug("Asking for XIVE\n");
1348 ibm_architecture_vec.vec5.intarch = OV5_FEAT(OV5_XIVE_EXPLOIT);
1352 static void __init prom_send_capabilities(void)
1358 /* Check ibm,arch-vec-5-platform-support and fixup vec5 if required */
1359 prom_check_platform_support();
1361 root = call_prom("open", 1, 1, ADDR("/"));
1363 /* We need to tell the FW about the number of cores we support.
1365 * To do that, we count the number of threads on the first core
1366 * (we assume this is the same for all cores) and use it to
1370 cores = DIV_ROUND_UP(NR_CPUS, prom_count_smt_threads());
1371 prom_printf("Max number of cores passed to firmware: %u (NR_CPUS = %d)\n",
1374 ibm_architecture_vec.vec5.max_cpus = cpu_to_be32(cores);
1376 /* try calling the ibm,client-architecture-support method */
1377 prom_printf("Calling ibm,client-architecture-support...");
1378 if (call_prom_ret("call-method", 3, 2, &ret,
1379 ADDR("ibm,client-architecture-support"),
1381 ADDR(&ibm_architecture_vec)) == 0) {
1382 /* the call exists... */
1384 prom_printf("\nWARNING: ibm,client-architecture"
1385 "-support call FAILED!\n");
1386 call_prom("close", 1, 0, root);
1387 prom_printf(" done\n");
1390 call_prom("close", 1, 0, root);
1391 prom_printf(" not implemented\n");
1394 #ifdef __BIG_ENDIAN__
1398 /* no ibm,client-architecture-support call, try the old way */
1399 elfloader = call_prom("open", 1, 1,
1400 ADDR("/packages/elf-loader"));
1401 if (elfloader == 0) {
1402 prom_printf("couldn't open /packages/elf-loader\n");
1405 call_prom("call-method", 3, 1, ADDR("process-elf-header"),
1406 elfloader, ADDR(&fake_elf));
1407 call_prom("close", 1, 0, elfloader);
1409 #endif /* __BIG_ENDIAN__ */
1411 #endif /* CONFIG_PPC_PSERIES */
1414 * Memory allocation strategy... our layout is normally:
1416 * at 14Mb or more we have vmlinux, then a gap and initrd. In some
1417 * rare cases, initrd might end up being before the kernel though.
1418 * We assume this won't override the final kernel at 0, we have no
1419 * provision to handle that in this version, but it should hopefully
1422 * alloc_top is set to the top of RMO, eventually shrink down if the
1425 * alloc_bottom is set to the top of kernel/initrd
1427 * from there, allocations are done this way : rtas is allocated
1428 * topmost, and the device-tree is allocated from the bottom. We try
1429 * to grow the device-tree allocation as we progress. If we can't,
1430 * then we fail, we don't currently have a facility to restart
1431 * elsewhere, but that shouldn't be necessary.
1433 * Note that calls to reserve_mem have to be done explicitly, memory
1434 * allocated with either alloc_up or alloc_down isn't automatically
1440 * Allocates memory in the RMO upward from the kernel/initrd
1442 * When align is 0, this is a special case, it means to allocate in place
1443 * at the current location of alloc_bottom or fail (that is basically
1444 * extending the previous allocation). Used for the device-tree flattening
1446 static unsigned long __init alloc_up(unsigned long size, unsigned long align)
1448 unsigned long base = alloc_bottom;
1449 unsigned long addr = 0;
1452 base = _ALIGN_UP(base, align);
1453 prom_debug("%s(%lx, %lx)\n", __func__, size, align);
1455 prom_panic("alloc_up() called with mem not initialized\n");
1458 base = _ALIGN_UP(alloc_bottom, align);
1460 base = alloc_bottom;
1462 for(; (base + size) <= alloc_top;
1463 base = _ALIGN_UP(base + 0x100000, align)) {
1464 prom_debug(" trying: 0x%lx\n\r", base);
1465 addr = (unsigned long)prom_claim(base, size, 0);
1466 if (addr != PROM_ERROR && addr != 0)
1474 alloc_bottom = addr + size;
1476 prom_debug(" -> %lx\n", addr);
1477 prom_debug(" alloc_bottom : %lx\n", alloc_bottom);
1478 prom_debug(" alloc_top : %lx\n", alloc_top);
1479 prom_debug(" alloc_top_hi : %lx\n", alloc_top_high);
1480 prom_debug(" rmo_top : %lx\n", rmo_top);
1481 prom_debug(" ram_top : %lx\n", ram_top);
1487 * Allocates memory downward, either from top of RMO, or if highmem
1488 * is set, from the top of RAM. Note that this one doesn't handle
1489 * failures. It does claim memory if highmem is not set.
1491 static unsigned long __init alloc_down(unsigned long size, unsigned long align,
1494 unsigned long base, addr = 0;
1496 prom_debug("%s(%lx, %lx, %s)\n", __func__, size, align,
1497 highmem ? "(high)" : "(low)");
1499 prom_panic("alloc_down() called with mem not initialized\n");
1502 /* Carve out storage for the TCE table. */
1503 addr = _ALIGN_DOWN(alloc_top_high - size, align);
1504 if (addr <= alloc_bottom)
1506 /* Will we bump into the RMO ? If yes, check out that we
1507 * didn't overlap existing allocations there, if we did,
1508 * we are dead, we must be the first in town !
1510 if (addr < rmo_top) {
1511 /* Good, we are first */
1512 if (alloc_top == rmo_top)
1513 alloc_top = rmo_top = addr;
1517 alloc_top_high = addr;
1521 base = _ALIGN_DOWN(alloc_top - size, align);
1522 for (; base > alloc_bottom;
1523 base = _ALIGN_DOWN(base - 0x100000, align)) {
1524 prom_debug(" trying: 0x%lx\n\r", base);
1525 addr = (unsigned long)prom_claim(base, size, 0);
1526 if (addr != PROM_ERROR && addr != 0)
1535 prom_debug(" -> %lx\n", addr);
1536 prom_debug(" alloc_bottom : %lx\n", alloc_bottom);
1537 prom_debug(" alloc_top : %lx\n", alloc_top);
1538 prom_debug(" alloc_top_hi : %lx\n", alloc_top_high);
1539 prom_debug(" rmo_top : %lx\n", rmo_top);
1540 prom_debug(" ram_top : %lx\n", ram_top);
1546 * Parse a "reg" cell
1548 static unsigned long __init prom_next_cell(int s, cell_t **cellp)
1551 unsigned long r = 0;
1553 /* Ignore more than 2 cells */
1554 while (s > sizeof(unsigned long) / 4) {
1558 r = be32_to_cpu(*p++);
1562 r |= be32_to_cpu(*(p++));
1570 * Very dumb function for adding to the memory reserve list, but
1571 * we don't need anything smarter at this point
1573 * XXX Eventually check for collisions. They should NEVER happen.
1574 * If problems seem to show up, it would be a good start to track
1577 static void __init reserve_mem(u64 base, u64 size)
1579 u64 top = base + size;
1580 unsigned long cnt = mem_reserve_cnt;
1585 /* We need to always keep one empty entry so that we
1586 * have our terminator with "size" set to 0 since we are
1587 * dumb and just copy this entire array to the boot params
1589 base = _ALIGN_DOWN(base, PAGE_SIZE);
1590 top = _ALIGN_UP(top, PAGE_SIZE);
1593 if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))
1594 prom_panic("Memory reserve map exhausted !\n");
1595 mem_reserve_map[cnt].base = cpu_to_be64(base);
1596 mem_reserve_map[cnt].size = cpu_to_be64(size);
1597 mem_reserve_cnt = cnt + 1;
1601 * Initialize memory allocation mechanism, parse "memory" nodes and
1602 * obtain that way the top of memory and RMO to setup out local allocator
1604 static void __init prom_init_mem(void)
1614 * We iterate the memory nodes to find
1615 * 1) top of RMO (first node)
1618 val = cpu_to_be32(2);
1619 prom_getprop(prom.root, "#address-cells", &val, sizeof(val));
1620 rac = be32_to_cpu(val);
1621 val = cpu_to_be32(1);
1622 prom_getprop(prom.root, "#size-cells", &val, sizeof(rsc));
1623 rsc = be32_to_cpu(val);
1624 prom_debug("root_addr_cells: %x\n", rac);
1625 prom_debug("root_size_cells: %x\n", rsc);
1627 prom_debug("scanning memory:\n");
1629 for (node = 0; prom_next_node(&node); ) {
1631 prom_getprop(node, "device_type", type, sizeof(type));
1635 * CHRP Longtrail machines have no device_type
1636 * on the memory node, so check the name instead...
1638 prom_getprop(node, "name", type, sizeof(type));
1640 if (prom_strcmp(type, "memory"))
1643 plen = prom_getprop(node, "reg", regbuf, sizeof(regbuf));
1644 if (plen > sizeof(regbuf)) {
1645 prom_printf("memory node too large for buffer !\n");
1646 plen = sizeof(regbuf);
1649 endp = p + (plen / sizeof(cell_t));
1652 memset(prom_scratch, 0, sizeof(prom_scratch));
1653 call_prom("package-to-path", 3, 1, node, prom_scratch,
1654 sizeof(prom_scratch) - 1);
1655 prom_debug(" node %s :\n", prom_scratch);
1656 #endif /* DEBUG_PROM */
1658 while ((endp - p) >= (rac + rsc)) {
1659 unsigned long base, size;
1661 base = prom_next_cell(rac, &p);
1662 size = prom_next_cell(rsc, &p);
1666 prom_debug(" %lx %lx\n", base, size);
1667 if (base == 0 && (of_platform & PLATFORM_LPAR))
1669 if ((base + size) > ram_top)
1670 ram_top = base + size;
1674 alloc_bottom = PAGE_ALIGN((unsigned long)&_end + 0x4000);
1677 * If prom_memory_limit is set we reduce the upper limits *except* for
1678 * alloc_top_high. This must be the real top of RAM so we can put
1682 alloc_top_high = ram_top;
1684 if (prom_memory_limit) {
1685 if (prom_memory_limit <= alloc_bottom) {
1686 prom_printf("Ignoring mem=%lx <= alloc_bottom.\n",
1688 prom_memory_limit = 0;
1689 } else if (prom_memory_limit >= ram_top) {
1690 prom_printf("Ignoring mem=%lx >= ram_top.\n",
1692 prom_memory_limit = 0;
1694 ram_top = prom_memory_limit;
1695 rmo_top = min(rmo_top, prom_memory_limit);
1700 * Setup our top alloc point, that is top of RMO or top of
1701 * segment 0 when running non-LPAR.
1702 * Some RS64 machines have buggy firmware where claims up at
1703 * 1GB fail. Cap at 768MB as a workaround.
1704 * Since 768MB is plenty of room, and we need to cap to something
1705 * reasonable on 32-bit, cap at 768MB on all machines.
1709 rmo_top = min(0x30000000ul, rmo_top);
1710 alloc_top = rmo_top;
1711 alloc_top_high = ram_top;
1714 * Check if we have an initrd after the kernel but still inside
1715 * the RMO. If we do move our bottom point to after it.
1717 if (prom_initrd_start &&
1718 prom_initrd_start < rmo_top &&
1719 prom_initrd_end > alloc_bottom)
1720 alloc_bottom = PAGE_ALIGN(prom_initrd_end);
1722 prom_printf("memory layout at init:\n");
1723 prom_printf(" memory_limit : %lx (16 MB aligned)\n",
1725 prom_printf(" alloc_bottom : %lx\n", alloc_bottom);
1726 prom_printf(" alloc_top : %lx\n", alloc_top);
1727 prom_printf(" alloc_top_hi : %lx\n", alloc_top_high);
1728 prom_printf(" rmo_top : %lx\n", rmo_top);
1729 prom_printf(" ram_top : %lx\n", ram_top);
1732 static void __init prom_close_stdin(void)
1737 if (prom_getprop(prom.chosen, "stdin", &val, sizeof(val)) > 0) {
1738 stdin = be32_to_cpu(val);
1739 call_prom("close", 1, 0, stdin);
1743 #ifdef CONFIG_PPC_SVM
1744 static int prom_rtas_hcall(uint64_t args)
1746 register uint64_t arg1 asm("r3") = H_RTAS;
1747 register uint64_t arg2 asm("r4") = args;
1749 asm volatile("sc 1\n" : "=r" (arg1) :
1755 static struct rtas_args __prombss os_term_args;
1757 static void __init prom_rtas_os_term(char *str)
1763 prom_debug("%s: start...\n", __func__);
1764 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1765 prom_debug("rtas_node: %x\n", rtas_node);
1766 if (!PHANDLE_VALID(rtas_node))
1770 prom_getprop(rtas_node, "ibm,os-term", &val, sizeof(val));
1771 token = be32_to_cpu(val);
1772 prom_debug("ibm,os-term: %x\n", token);
1774 prom_panic("Could not get token for ibm,os-term\n");
1775 os_term_args.token = cpu_to_be32(token);
1776 os_term_args.nargs = cpu_to_be32(1);
1777 os_term_args.nret = cpu_to_be32(1);
1778 os_term_args.args[0] = cpu_to_be32(__pa(str));
1779 prom_rtas_hcall((uint64_t)&os_term_args);
1781 #endif /* CONFIG_PPC_SVM */
1784 * Allocate room for and instantiate RTAS
1786 static void __init prom_instantiate_rtas(void)
1790 u32 base, entry = 0;
1794 prom_debug("prom_instantiate_rtas: start...\n");
1796 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1797 prom_debug("rtas_node: %x\n", rtas_node);
1798 if (!PHANDLE_VALID(rtas_node))
1802 prom_getprop(rtas_node, "rtas-size", &val, sizeof(size));
1803 size = be32_to_cpu(val);
1807 base = alloc_down(size, PAGE_SIZE, 0);
1809 prom_panic("Could not allocate memory for RTAS\n");
1811 rtas_inst = call_prom("open", 1, 1, ADDR("/rtas"));
1812 if (!IHANDLE_VALID(rtas_inst)) {
1813 prom_printf("opening rtas package failed (%x)\n", rtas_inst);
1817 prom_printf("instantiating rtas at 0x%x...", base);
1819 if (call_prom_ret("call-method", 3, 2, &entry,
1820 ADDR("instantiate-rtas"),
1821 rtas_inst, base) != 0
1823 prom_printf(" failed\n");
1826 prom_printf(" done\n");
1828 reserve_mem(base, size);
1830 val = cpu_to_be32(base);
1831 prom_setprop(rtas_node, "/rtas", "linux,rtas-base",
1833 val = cpu_to_be32(entry);
1834 prom_setprop(rtas_node, "/rtas", "linux,rtas-entry",
1837 /* Check if it supports "query-cpu-stopped-state" */
1838 if (prom_getprop(rtas_node, "query-cpu-stopped-state",
1839 &val, sizeof(val)) != PROM_ERROR)
1840 rtas_has_query_cpu_stopped = true;
1842 prom_debug("rtas base = 0x%x\n", base);
1843 prom_debug("rtas entry = 0x%x\n", entry);
1844 prom_debug("rtas size = 0x%x\n", size);
1846 prom_debug("prom_instantiate_rtas: end...\n");
1851 * Allocate room for and instantiate Stored Measurement Log (SML)
1853 static void __init prom_instantiate_sml(void)
1855 phandle ibmvtpm_node;
1856 ihandle ibmvtpm_inst;
1857 u32 entry = 0, size = 0, succ = 0;
1861 prom_debug("prom_instantiate_sml: start...\n");
1863 ibmvtpm_node = call_prom("finddevice", 1, 1, ADDR("/vdevice/vtpm"));
1864 prom_debug("ibmvtpm_node: %x\n", ibmvtpm_node);
1865 if (!PHANDLE_VALID(ibmvtpm_node))
1868 ibmvtpm_inst = call_prom("open", 1, 1, ADDR("/vdevice/vtpm"));
1869 if (!IHANDLE_VALID(ibmvtpm_inst)) {
1870 prom_printf("opening vtpm package failed (%x)\n", ibmvtpm_inst);
1874 if (prom_getprop(ibmvtpm_node, "ibm,sml-efi-reformat-supported",
1875 &val, sizeof(val)) != PROM_ERROR) {
1876 if (call_prom_ret("call-method", 2, 2, &succ,
1877 ADDR("reformat-sml-to-efi-alignment"),
1878 ibmvtpm_inst) != 0 || succ == 0) {
1879 prom_printf("Reformat SML to EFI alignment failed\n");
1883 if (call_prom_ret("call-method", 2, 2, &size,
1884 ADDR("sml-get-allocated-size"),
1885 ibmvtpm_inst) != 0 || size == 0) {
1886 prom_printf("SML get allocated size failed\n");
1890 if (call_prom_ret("call-method", 2, 2, &size,
1891 ADDR("sml-get-handover-size"),
1892 ibmvtpm_inst) != 0 || size == 0) {
1893 prom_printf("SML get handover size failed\n");
1898 base = alloc_down(size, PAGE_SIZE, 0);
1900 prom_panic("Could not allocate memory for sml\n");
1902 prom_printf("instantiating sml at 0x%llx...", base);
1904 memset((void *)base, 0, size);
1906 if (call_prom_ret("call-method", 4, 2, &entry,
1907 ADDR("sml-handover"),
1908 ibmvtpm_inst, size, base) != 0 || entry == 0) {
1909 prom_printf("SML handover failed\n");
1912 prom_printf(" done\n");
1914 reserve_mem(base, size);
1916 prom_setprop(ibmvtpm_node, "/vdevice/vtpm", "linux,sml-base",
1917 &base, sizeof(base));
1918 prom_setprop(ibmvtpm_node, "/vdevice/vtpm", "linux,sml-size",
1919 &size, sizeof(size));
1921 prom_debug("sml base = 0x%llx\n", base);
1922 prom_debug("sml size = 0x%x\n", size);
1924 prom_debug("prom_instantiate_sml: end...\n");
1928 * Allocate room for and initialize TCE tables
1930 #ifdef __BIG_ENDIAN__
1931 static void __init prom_initialize_tce_table(void)
1935 char compatible[64], type[64], model[64];
1936 char *path = prom_scratch;
1938 u32 minalign, minsize;
1939 u64 tce_entry, *tce_entryp;
1940 u64 local_alloc_top, local_alloc_bottom;
1946 prom_debug("starting prom_initialize_tce_table\n");
1948 /* Cache current top of allocs so we reserve a single block */
1949 local_alloc_top = alloc_top_high;
1950 local_alloc_bottom = local_alloc_top;
1952 /* Search all nodes looking for PHBs. */
1953 for (node = 0; prom_next_node(&node); ) {
1957 prom_getprop(node, "compatible",
1958 compatible, sizeof(compatible));
1959 prom_getprop(node, "device_type", type, sizeof(type));
1960 prom_getprop(node, "model", model, sizeof(model));
1962 if ((type[0] == 0) || (prom_strstr(type, "pci") == NULL))
1965 /* Keep the old logic intact to avoid regression. */
1966 if (compatible[0] != 0) {
1967 if ((prom_strstr(compatible, "python") == NULL) &&
1968 (prom_strstr(compatible, "Speedwagon") == NULL) &&
1969 (prom_strstr(compatible, "Winnipeg") == NULL))
1971 } else if (model[0] != 0) {
1972 if ((prom_strstr(model, "ython") == NULL) &&
1973 (prom_strstr(model, "peedwagon") == NULL) &&
1974 (prom_strstr(model, "innipeg") == NULL))
1978 if (prom_getprop(node, "tce-table-minalign", &minalign,
1979 sizeof(minalign)) == PROM_ERROR)
1981 if (prom_getprop(node, "tce-table-minsize", &minsize,
1982 sizeof(minsize)) == PROM_ERROR)
1983 minsize = 4UL << 20;
1986 * Even though we read what OF wants, we just set the table
1987 * size to 4 MB. This is enough to map 2GB of PCI DMA space.
1988 * By doing this, we avoid the pitfalls of trying to DMA to
1989 * MMIO space and the DMA alias hole.
1991 minsize = 4UL << 20;
1993 /* Align to the greater of the align or size */
1994 align = max(minalign, minsize);
1995 base = alloc_down(minsize, align, 1);
1997 prom_panic("ERROR, cannot find space for TCE table.\n");
1998 if (base < local_alloc_bottom)
1999 local_alloc_bottom = base;
2001 /* It seems OF doesn't null-terminate the path :-( */
2002 memset(path, 0, sizeof(prom_scratch));
2003 /* Call OF to setup the TCE hardware */
2004 if (call_prom("package-to-path", 3, 1, node,
2005 path, sizeof(prom_scratch) - 1) == PROM_ERROR) {
2006 prom_printf("package-to-path failed\n");
2009 /* Save away the TCE table attributes for later use. */
2010 prom_setprop(node, path, "linux,tce-base", &base, sizeof(base));
2011 prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize));
2013 prom_debug("TCE table: %s\n", path);
2014 prom_debug("\tnode = 0x%x\n", node);
2015 prom_debug("\tbase = 0x%llx\n", base);
2016 prom_debug("\tsize = 0x%x\n", minsize);
2018 /* Initialize the table to have a one-to-one mapping
2019 * over the allocated size.
2021 tce_entryp = (u64 *)base;
2022 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) {
2023 tce_entry = (i << PAGE_SHIFT);
2025 *tce_entryp = tce_entry;
2028 prom_printf("opening PHB %s", path);
2029 phb_node = call_prom("open", 1, 1, path);
2031 prom_printf("... failed\n");
2033 prom_printf("... done\n");
2035 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
2036 phb_node, -1, minsize,
2037 (u32) base, (u32) (base >> 32));
2038 call_prom("close", 1, 0, phb_node);
2041 reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);
2043 /* These are only really needed if there is a memory limit in
2044 * effect, but we don't know so export them always. */
2045 prom_tce_alloc_start = local_alloc_bottom;
2046 prom_tce_alloc_end = local_alloc_top;
2048 /* Flag the first invalid entry */
2049 prom_debug("ending prom_initialize_tce_table\n");
2051 #endif /* __BIG_ENDIAN__ */
2052 #endif /* CONFIG_PPC64 */
2055 * With CHRP SMP we need to use the OF to start the other processors.
2056 * We can't wait until smp_boot_cpus (the OF is trashed by then)
2057 * so we have to put the processors into a holding pattern controlled
2058 * by the kernel (not OF) before we destroy the OF.
2060 * This uses a chunk of low memory, puts some holding pattern
2061 * code there and sends the other processors off to there until
2062 * smp_boot_cpus tells them to do something. The holding pattern
2063 * checks that address until its cpu # is there, when it is that
2064 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care
2065 * of setting those values.
2067 * We also use physical address 0x4 here to tell when a cpu
2068 * is in its holding pattern code.
2073 * We want to reference the copy of __secondary_hold_* in the
2074 * 0 - 0x100 address range
2076 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff)
2078 static void __init prom_hold_cpus(void)
2083 unsigned long *spinloop
2084 = (void *) LOW_ADDR(__secondary_hold_spinloop);
2085 unsigned long *acknowledge
2086 = (void *) LOW_ADDR(__secondary_hold_acknowledge);
2087 unsigned long secondary_hold = LOW_ADDR(__secondary_hold);
2090 * On pseries, if RTAS supports "query-cpu-stopped-state",
2091 * we skip this stage, the CPUs will be started by the
2092 * kernel using RTAS.
2094 if ((of_platform == PLATFORM_PSERIES ||
2095 of_platform == PLATFORM_PSERIES_LPAR) &&
2096 rtas_has_query_cpu_stopped) {
2097 prom_printf("prom_hold_cpus: skipped\n");
2101 prom_debug("prom_hold_cpus: start...\n");
2102 prom_debug(" 1) spinloop = 0x%lx\n", (unsigned long)spinloop);
2103 prom_debug(" 1) *spinloop = 0x%lx\n", *spinloop);
2104 prom_debug(" 1) acknowledge = 0x%lx\n",
2105 (unsigned long)acknowledge);
2106 prom_debug(" 1) *acknowledge = 0x%lx\n", *acknowledge);
2107 prom_debug(" 1) secondary_hold = 0x%lx\n", secondary_hold);
2109 /* Set the common spinloop variable, so all of the secondary cpus
2110 * will block when they are awakened from their OF spinloop.
2111 * This must occur for both SMP and non SMP kernels, since OF will
2112 * be trashed when we move the kernel.
2117 for (node = 0; prom_next_node(&node); ) {
2118 unsigned int cpu_no;
2122 prom_getprop(node, "device_type", type, sizeof(type));
2123 if (prom_strcmp(type, "cpu") != 0)
2126 /* Skip non-configured cpus. */
2127 if (prom_getprop(node, "status", type, sizeof(type)) > 0)
2128 if (prom_strcmp(type, "okay") != 0)
2131 reg = cpu_to_be32(-1); /* make sparse happy */
2132 prom_getprop(node, "reg", ®, sizeof(reg));
2133 cpu_no = be32_to_cpu(reg);
2135 prom_debug("cpu hw idx = %u\n", cpu_no);
2137 /* Init the acknowledge var which will be reset by
2138 * the secondary cpu when it awakens from its OF
2141 *acknowledge = (unsigned long)-1;
2143 if (cpu_no != prom.cpu) {
2144 /* Primary Thread of non-boot cpu or any thread */
2145 prom_printf("starting cpu hw idx %u... ", cpu_no);
2146 call_prom("start-cpu", 3, 0, node,
2147 secondary_hold, cpu_no);
2149 for (i = 0; (i < 100000000) &&
2150 (*acknowledge == ((unsigned long)-1)); i++ )
2153 if (*acknowledge == cpu_no)
2154 prom_printf("done\n");
2156 prom_printf("failed: %lx\n", *acknowledge);
2160 prom_printf("boot cpu hw idx %u\n", cpu_no);
2161 #endif /* CONFIG_SMP */
2164 prom_debug("prom_hold_cpus: end...\n");
2168 static void __init prom_init_client_services(unsigned long pp)
2170 /* Get a handle to the prom entry point before anything else */
2173 /* get a handle for the stdout device */
2174 prom.chosen = call_prom("finddevice", 1, 1, ADDR("/chosen"));
2175 if (!PHANDLE_VALID(prom.chosen))
2176 prom_panic("cannot find chosen"); /* msg won't be printed :( */
2178 /* get device tree root */
2179 prom.root = call_prom("finddevice", 1, 1, ADDR("/"));
2180 if (!PHANDLE_VALID(prom.root))
2181 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
2188 * For really old powermacs, we need to map things we claim.
2189 * For that, we need the ihandle of the mmu.
2190 * Also, on the longtrail, we need to work around other bugs.
2192 static void __init prom_find_mmu(void)
2197 oprom = call_prom("finddevice", 1, 1, ADDR("/openprom"));
2198 if (!PHANDLE_VALID(oprom))
2200 if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0)
2202 version[sizeof(version) - 1] = 0;
2203 /* XXX might need to add other versions here */
2204 if (prom_strcmp(version, "Open Firmware, 1.0.5") == 0)
2205 of_workarounds = OF_WA_CLAIM;
2206 else if (prom_strncmp(version, "FirmWorks,3.", 12) == 0) {
2207 of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL;
2208 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
2211 prom.memory = call_prom("open", 1, 1, ADDR("/memory"));
2212 prom_getprop(prom.chosen, "mmu", &prom.mmumap,
2213 sizeof(prom.mmumap));
2214 prom.mmumap = be32_to_cpu(prom.mmumap);
2215 if (!IHANDLE_VALID(prom.memory) || !IHANDLE_VALID(prom.mmumap))
2216 of_workarounds &= ~OF_WA_CLAIM; /* hmmm */
2219 #define prom_find_mmu()
2222 static void __init prom_init_stdout(void)
2224 char *path = of_stdout_device;
2226 phandle stdout_node;
2229 if (prom_getprop(prom.chosen, "stdout", &val, sizeof(val)) <= 0)
2230 prom_panic("cannot find stdout");
2232 prom.stdout = be32_to_cpu(val);
2234 /* Get the full OF pathname of the stdout device */
2235 memset(path, 0, 256);
2236 call_prom("instance-to-path", 3, 1, prom.stdout, path, 255);
2237 prom_printf("OF stdout device is: %s\n", of_stdout_device);
2238 prom_setprop(prom.chosen, "/chosen", "linux,stdout-path",
2239 path, prom_strlen(path) + 1);
2241 /* instance-to-package fails on PA-Semi */
2242 stdout_node = call_prom("instance-to-package", 1, 1, prom.stdout);
2243 if (stdout_node != PROM_ERROR) {
2244 val = cpu_to_be32(stdout_node);
2246 /* If it's a display, note it */
2247 memset(type, 0, sizeof(type));
2248 prom_getprop(stdout_node, "device_type", type, sizeof(type));
2249 if (prom_strcmp(type, "display") == 0)
2250 prom_setprop(stdout_node, path, "linux,boot-display", NULL, 0);
2254 static int __init prom_find_machine_type(void)
2263 /* Look for a PowerMac or a Cell */
2264 len = prom_getprop(prom.root, "compatible",
2265 compat, sizeof(compat)-1);
2269 char *p = &compat[i];
2270 int sl = prom_strlen(p);
2273 if (prom_strstr(p, "Power Macintosh") ||
2274 prom_strstr(p, "MacRISC"))
2275 return PLATFORM_POWERMAC;
2277 /* We must make sure we don't detect the IBM Cell
2278 * blades as pSeries due to some firmware issues,
2281 if (prom_strstr(p, "IBM,CBEA") ||
2282 prom_strstr(p, "IBM,CPBW-1.0"))
2283 return PLATFORM_GENERIC;
2284 #endif /* CONFIG_PPC64 */
2289 /* Try to figure out if it's an IBM pSeries or any other
2290 * PAPR compliant platform. We assume it is if :
2291 * - /device_type is "chrp" (please, do NOT use that for future
2295 len = prom_getprop(prom.root, "device_type",
2296 compat, sizeof(compat)-1);
2298 return PLATFORM_GENERIC;
2299 if (prom_strcmp(compat, "chrp"))
2300 return PLATFORM_GENERIC;
2302 /* Default to pSeries. We need to know if we are running LPAR */
2303 rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
2304 if (!PHANDLE_VALID(rtas))
2305 return PLATFORM_GENERIC;
2306 x = prom_getproplen(rtas, "ibm,hypertas-functions");
2307 if (x != PROM_ERROR) {
2308 prom_debug("Hypertas detected, assuming LPAR !\n");
2309 return PLATFORM_PSERIES_LPAR;
2311 return PLATFORM_PSERIES;
2313 return PLATFORM_GENERIC;
2317 static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
2319 return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);
2323 * If we have a display that we don't know how to drive,
2324 * we will want to try to execute OF's open method for it
2325 * later. However, OF will probably fall over if we do that
2326 * we've taken over the MMU.
2327 * So we check whether we will need to open the display,
2328 * and if so, open it now.
2330 static void __init prom_check_displays(void)
2332 char type[16], *path;
2337 static const unsigned char default_colors[] __initconst = {
2355 const unsigned char *clut;
2357 prom_debug("Looking for displays\n");
2358 for (node = 0; prom_next_node(&node); ) {
2359 memset(type, 0, sizeof(type));
2360 prom_getprop(node, "device_type", type, sizeof(type));
2361 if (prom_strcmp(type, "display") != 0)
2364 /* It seems OF doesn't null-terminate the path :-( */
2365 path = prom_scratch;
2366 memset(path, 0, sizeof(prom_scratch));
2369 * leave some room at the end of the path for appending extra
2372 if (call_prom("package-to-path", 3, 1, node, path,
2373 sizeof(prom_scratch) - 10) == PROM_ERROR)
2375 prom_printf("found display : %s, opening... ", path);
2377 ih = call_prom("open", 1, 1, path);
2379 prom_printf("failed\n");
2384 prom_printf("done\n");
2385 prom_setprop(node, path, "linux,opened", NULL, 0);
2387 /* Setup a usable color table when the appropriate
2388 * method is available. Should update this to set-colors */
2389 clut = default_colors;
2390 for (i = 0; i < 16; i++, clut += 3)
2391 if (prom_set_color(ih, i, clut[0], clut[1],
2395 #ifdef CONFIG_LOGO_LINUX_CLUT224
2396 clut = PTRRELOC(logo_linux_clut224.clut);
2397 for (i = 0; i < logo_linux_clut224.clutsize; i++, clut += 3)
2398 if (prom_set_color(ih, i + 32, clut[0], clut[1],
2401 #endif /* CONFIG_LOGO_LINUX_CLUT224 */
2403 #ifdef CONFIG_PPC_EARLY_DEBUG_BOOTX
2404 if (prom_getprop(node, "linux,boot-display", NULL, 0) !=
2406 u32 width, height, pitch, addr;
2408 prom_printf("Setting btext !\n");
2409 prom_getprop(node, "width", &width, 4);
2410 prom_getprop(node, "height", &height, 4);
2411 prom_getprop(node, "linebytes", &pitch, 4);
2412 prom_getprop(node, "address", &addr, 4);
2413 prom_printf("W=%d H=%d LB=%d addr=0x%x\n",
2414 width, height, pitch, addr);
2415 btext_setup_display(width, height, 8, pitch, addr);
2416 btext_prepare_BAT();
2418 #endif /* CONFIG_PPC_EARLY_DEBUG_BOOTX */
2423 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */
2424 static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end,
2425 unsigned long needed, unsigned long align)
2429 *mem_start = _ALIGN(*mem_start, align);
2430 while ((*mem_start + needed) > *mem_end) {
2431 unsigned long room, chunk;
2433 prom_debug("Chunk exhausted, claiming more at %lx...\n",
2435 room = alloc_top - alloc_bottom;
2436 if (room > DEVTREE_CHUNK_SIZE)
2437 room = DEVTREE_CHUNK_SIZE;
2438 if (room < PAGE_SIZE)
2439 prom_panic("No memory for flatten_device_tree "
2441 chunk = alloc_up(room, 0);
2443 prom_panic("No memory for flatten_device_tree "
2444 "(claim failed)\n");
2445 *mem_end = chunk + room;
2448 ret = (void *)*mem_start;
2449 *mem_start += needed;
2454 #define dt_push_token(token, mem_start, mem_end) do { \
2455 void *room = make_room(mem_start, mem_end, 4, 4); \
2456 *(__be32 *)room = cpu_to_be32(token); \
2459 static unsigned long __init dt_find_string(char *str)
2463 s = os = (char *)dt_string_start;
2465 while (s < (char *)dt_string_end) {
2466 if (prom_strcmp(s, str) == 0)
2468 s += prom_strlen(s) + 1;
2474 * The Open Firmware 1275 specification states properties must be 31 bytes or
2475 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
2477 #define MAX_PROPERTY_NAME 64
2479 static void __init scan_dt_build_strings(phandle node,
2480 unsigned long *mem_start,
2481 unsigned long *mem_end)
2483 char *prev_name, *namep, *sstart;
2487 sstart = (char *)dt_string_start;
2489 /* get and store all property names */
2492 /* 64 is max len of name including nul. */
2493 namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1);
2494 if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) {
2495 /* No more nodes: unwind alloc */
2496 *mem_start = (unsigned long)namep;
2501 if (prom_strcmp(namep, "name") == 0) {
2502 *mem_start = (unsigned long)namep;
2506 /* get/create string entry */
2507 soff = dt_find_string(namep);
2509 *mem_start = (unsigned long)namep;
2510 namep = sstart + soff;
2512 /* Trim off some if we can */
2513 *mem_start = (unsigned long)namep + prom_strlen(namep) + 1;
2514 dt_string_end = *mem_start;
2519 /* do all our children */
2520 child = call_prom("child", 1, 1, node);
2521 while (child != 0) {
2522 scan_dt_build_strings(child, mem_start, mem_end);
2523 child = call_prom("peer", 1, 1, child);
2527 static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
2528 unsigned long *mem_end)
2531 char *namep, *prev_name, *sstart, *p, *ep, *lp, *path;
2533 unsigned char *valp;
2534 static char pname[MAX_PROPERTY_NAME] __prombss;
2535 int l, room, has_phandle = 0;
2537 dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);
2539 /* get the node's full name */
2540 namep = (char *)*mem_start;
2541 room = *mem_end - *mem_start;
2544 l = call_prom("package-to-path", 3, 1, node, namep, room);
2546 /* Didn't fit? Get more room. */
2548 if (l >= *mem_end - *mem_start)
2549 namep = make_room(mem_start, mem_end, l+1, 1);
2550 call_prom("package-to-path", 3, 1, node, namep, l);
2554 /* Fixup an Apple bug where they have bogus \0 chars in the
2555 * middle of the path in some properties, and extract
2556 * the unit name (everything after the last '/').
2558 for (lp = p = namep, ep = namep + l; p < ep; p++) {
2565 *mem_start = _ALIGN((unsigned long)lp + 1, 4);
2568 /* get it again for debugging */
2569 path = prom_scratch;
2570 memset(path, 0, sizeof(prom_scratch));
2571 call_prom("package-to-path", 3, 1, node, path, sizeof(prom_scratch) - 1);
2573 /* get and store all properties */
2575 sstart = (char *)dt_string_start;
2577 if (call_prom("nextprop", 3, 1, node, prev_name,
2582 if (prom_strcmp(pname, "name") == 0) {
2587 /* find string offset */
2588 soff = dt_find_string(pname);
2590 prom_printf("WARNING: Can't find string index for"
2591 " <%s>, node %s\n", pname, path);
2594 prev_name = sstart + soff;
2597 l = call_prom("getproplen", 2, 1, node, pname);
2600 if (l == PROM_ERROR)
2603 /* push property head */
2604 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2605 dt_push_token(l, mem_start, mem_end);
2606 dt_push_token(soff, mem_start, mem_end);
2608 /* push property content */
2609 valp = make_room(mem_start, mem_end, l, 4);
2610 call_prom("getprop", 4, 1, node, pname, valp, l);
2611 *mem_start = _ALIGN(*mem_start, 4);
2613 if (!prom_strcmp(pname, "phandle"))
2617 /* Add a "phandle" property if none already exist */
2619 soff = dt_find_string("phandle");
2621 prom_printf("WARNING: Can't find string index for <phandle> node %s\n", path);
2623 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2624 dt_push_token(4, mem_start, mem_end);
2625 dt_push_token(soff, mem_start, mem_end);
2626 valp = make_room(mem_start, mem_end, 4, 4);
2627 *(__be32 *)valp = cpu_to_be32(node);
2631 /* do all our children */
2632 child = call_prom("child", 1, 1, node);
2633 while (child != 0) {
2634 scan_dt_build_struct(child, mem_start, mem_end);
2635 child = call_prom("peer", 1, 1, child);
2638 dt_push_token(OF_DT_END_NODE, mem_start, mem_end);
2641 static void __init flatten_device_tree(void)
2644 unsigned long mem_start, mem_end, room;
2645 struct boot_param_header *hdr;
2650 * Check how much room we have between alloc top & bottom (+/- a
2651 * few pages), crop to 1MB, as this is our "chunk" size
2653 room = alloc_top - alloc_bottom - 0x4000;
2654 if (room > DEVTREE_CHUNK_SIZE)
2655 room = DEVTREE_CHUNK_SIZE;
2656 prom_debug("starting device tree allocs at %lx\n", alloc_bottom);
2658 /* Now try to claim that */
2659 mem_start = (unsigned long)alloc_up(room, PAGE_SIZE);
2661 prom_panic("Can't allocate initial device-tree chunk\n");
2662 mem_end = mem_start + room;
2664 /* Get root of tree */
2665 root = call_prom("peer", 1, 1, (phandle)0);
2666 if (root == (phandle)0)
2667 prom_panic ("couldn't get device tree root\n");
2669 /* Build header and make room for mem rsv map */
2670 mem_start = _ALIGN(mem_start, 4);
2671 hdr = make_room(&mem_start, &mem_end,
2672 sizeof(struct boot_param_header), 4);
2673 dt_header_start = (unsigned long)hdr;
2674 rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8);
2676 /* Start of strings */
2677 mem_start = PAGE_ALIGN(mem_start);
2678 dt_string_start = mem_start;
2679 mem_start += 4; /* hole */
2681 /* Add "phandle" in there, we'll need it */
2682 namep = make_room(&mem_start, &mem_end, 16, 1);
2683 prom_strcpy(namep, "phandle");
2684 mem_start = (unsigned long)namep + prom_strlen(namep) + 1;
2686 /* Build string array */
2687 prom_printf("Building dt strings...\n");
2688 scan_dt_build_strings(root, &mem_start, &mem_end);
2689 dt_string_end = mem_start;
2691 /* Build structure */
2692 mem_start = PAGE_ALIGN(mem_start);
2693 dt_struct_start = mem_start;
2694 prom_printf("Building dt structure...\n");
2695 scan_dt_build_struct(root, &mem_start, &mem_end);
2696 dt_push_token(OF_DT_END, &mem_start, &mem_end);
2697 dt_struct_end = PAGE_ALIGN(mem_start);
2700 hdr->boot_cpuid_phys = cpu_to_be32(prom.cpu);
2701 hdr->magic = cpu_to_be32(OF_DT_HEADER);
2702 hdr->totalsize = cpu_to_be32(dt_struct_end - dt_header_start);
2703 hdr->off_dt_struct = cpu_to_be32(dt_struct_start - dt_header_start);
2704 hdr->off_dt_strings = cpu_to_be32(dt_string_start - dt_header_start);
2705 hdr->dt_strings_size = cpu_to_be32(dt_string_end - dt_string_start);
2706 hdr->off_mem_rsvmap = cpu_to_be32(((unsigned long)rsvmap) - dt_header_start);
2707 hdr->version = cpu_to_be32(OF_DT_VERSION);
2708 /* Version 16 is not backward compatible */
2709 hdr->last_comp_version = cpu_to_be32(0x10);
2711 /* Copy the reserve map in */
2712 memcpy(rsvmap, mem_reserve_map, sizeof(mem_reserve_map));
2717 prom_printf("reserved memory map:\n");
2718 for (i = 0; i < mem_reserve_cnt; i++)
2719 prom_printf(" %llx - %llx\n",
2720 be64_to_cpu(mem_reserve_map[i].base),
2721 be64_to_cpu(mem_reserve_map[i].size));
2724 /* Bump mem_reserve_cnt to cause further reservations to fail
2725 * since it's too late.
2727 mem_reserve_cnt = MEM_RESERVE_MAP_SIZE;
2729 prom_printf("Device tree strings 0x%lx -> 0x%lx\n",
2730 dt_string_start, dt_string_end);
2731 prom_printf("Device tree struct 0x%lx -> 0x%lx\n",
2732 dt_struct_start, dt_struct_end);
2735 #ifdef CONFIG_PPC_MAPLE
2736 /* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property.
2737 * The values are bad, and it doesn't even have the right number of cells. */
2738 static void __init fixup_device_tree_maple(void)
2741 u32 rloc = 0x01002000; /* IO space; PCI device = 4 */
2745 name = "/ht@0/isa@4";
2746 isa = call_prom("finddevice", 1, 1, ADDR(name));
2747 if (!PHANDLE_VALID(isa)) {
2748 name = "/ht@0/isa@6";
2749 isa = call_prom("finddevice", 1, 1, ADDR(name));
2750 rloc = 0x01003000; /* IO space; PCI device = 6 */
2752 if (!PHANDLE_VALID(isa))
2755 if (prom_getproplen(isa, "ranges") != 12)
2757 if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges))
2761 if (isa_ranges[0] != 0x1 ||
2762 isa_ranges[1] != 0xf4000000 ||
2763 isa_ranges[2] != 0x00010000)
2766 prom_printf("Fixing up bogus ISA range on Maple/Apache...\n");
2768 isa_ranges[0] = 0x1;
2769 isa_ranges[1] = 0x0;
2770 isa_ranges[2] = rloc;
2771 isa_ranges[3] = 0x0;
2772 isa_ranges[4] = 0x0;
2773 isa_ranges[5] = 0x00010000;
2774 prom_setprop(isa, name, "ranges",
2775 isa_ranges, sizeof(isa_ranges));
2778 #define CPC925_MC_START 0xf8000000
2779 #define CPC925_MC_LENGTH 0x1000000
2780 /* The values for memory-controller don't have right number of cells */
2781 static void __init fixup_device_tree_maple_memory_controller(void)
2785 char *name = "/hostbridge@f8000000";
2788 mc = call_prom("finddevice", 1, 1, ADDR(name));
2789 if (!PHANDLE_VALID(mc))
2792 if (prom_getproplen(mc, "reg") != 8)
2795 prom_getprop(prom.root, "#address-cells", &ac, sizeof(ac));
2796 prom_getprop(prom.root, "#size-cells", &sc, sizeof(sc));
2797 if ((ac != 2) || (sc != 2))
2800 if (prom_getprop(mc, "reg", mc_reg, sizeof(mc_reg)) == PROM_ERROR)
2803 if (mc_reg[0] != CPC925_MC_START || mc_reg[1] != CPC925_MC_LENGTH)
2806 prom_printf("Fixing up bogus hostbridge on Maple...\n");
2809 mc_reg[1] = CPC925_MC_START;
2811 mc_reg[3] = CPC925_MC_LENGTH;
2812 prom_setprop(mc, name, "reg", mc_reg, sizeof(mc_reg));
2815 #define fixup_device_tree_maple()
2816 #define fixup_device_tree_maple_memory_controller()
2819 #ifdef CONFIG_PPC_CHRP
2821 * Pegasos and BriQ lacks the "ranges" property in the isa node
2822 * Pegasos needs decimal IRQ 14/15, not hexadecimal
2823 * Pegasos has the IDE configured in legacy mode, but advertised as native
2825 static void __init fixup_device_tree_chrp(void)
2829 u32 rloc = 0x01006000; /* IO space; PCI device = 12 */
2833 name = "/pci@80000000/isa@c";
2834 ph = call_prom("finddevice", 1, 1, ADDR(name));
2835 if (!PHANDLE_VALID(ph)) {
2836 name = "/pci@ff500000/isa@6";
2837 ph = call_prom("finddevice", 1, 1, ADDR(name));
2838 rloc = 0x01003000; /* IO space; PCI device = 6 */
2840 if (PHANDLE_VALID(ph)) {
2841 rc = prom_getproplen(ph, "ranges");
2842 if (rc == 0 || rc == PROM_ERROR) {
2843 prom_printf("Fixing up missing ISA range on Pegasos...\n");
2850 prop[5] = 0x00010000;
2851 prom_setprop(ph, name, "ranges", prop, sizeof(prop));
2855 name = "/pci@80000000/ide@C,1";
2856 ph = call_prom("finddevice", 1, 1, ADDR(name));
2857 if (PHANDLE_VALID(ph)) {
2858 prom_printf("Fixing up IDE interrupt on Pegasos...\n");
2861 prom_setprop(ph, name, "interrupts", prop, 2*sizeof(u32));
2862 prom_printf("Fixing up IDE class-code on Pegasos...\n");
2863 rc = prom_getprop(ph, "class-code", prop, sizeof(u32));
2864 if (rc == sizeof(u32)) {
2866 prom_setprop(ph, name, "class-code", prop, sizeof(u32));
2871 #define fixup_device_tree_chrp()
2874 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
2875 static void __init fixup_device_tree_pmac(void)
2877 phandle u3, i2c, mpic;
2882 /* Some G5s have a missing interrupt definition, fix it up here */
2883 u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
2884 if (!PHANDLE_VALID(u3))
2886 i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
2887 if (!PHANDLE_VALID(i2c))
2889 mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
2890 if (!PHANDLE_VALID(mpic))
2893 /* check if proper rev of u3 */
2894 if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev))
2897 if (u3_rev < 0x35 || u3_rev > 0x39)
2899 /* does it need fixup ? */
2900 if (prom_getproplen(i2c, "interrupts") > 0)
2903 prom_printf("fixing up bogus interrupts for u3 i2c...\n");
2905 /* interrupt on this revision of u3 is number 0 and level */
2908 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts",
2909 &interrupts, sizeof(interrupts));
2911 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
2912 &parent, sizeof(parent));
2915 #define fixup_device_tree_pmac()
2918 #ifdef CONFIG_PPC_EFIKA
2920 * The MPC5200 FEC driver requires an phy-handle property to tell it how
2921 * to talk to the phy. If the phy-handle property is missing, then this
2922 * function is called to add the appropriate nodes and link it to the
2925 static void __init fixup_device_tree_efika_add_phy(void)
2931 /* Check if /builtin/ethernet exists - bail if it doesn't */
2932 node = call_prom("finddevice", 1, 1, ADDR("/builtin/ethernet"));
2933 if (!PHANDLE_VALID(node))
2936 /* Check if the phy-handle property exists - bail if it does */
2937 rv = prom_getprop(node, "phy-handle", prop, sizeof(prop));
2942 * At this point the ethernet device doesn't have a phy described.
2943 * Now we need to add the missing phy node and linkage
2946 /* Check for an MDIO bus node - if missing then create one */
2947 node = call_prom("finddevice", 1, 1, ADDR("/builtin/mdio"));
2948 if (!PHANDLE_VALID(node)) {
2949 prom_printf("Adding Ethernet MDIO node\n");
2950 call_prom("interpret", 1, 1,
2951 " s\" /builtin\" find-device"
2953 " 1 encode-int s\" #address-cells\" property"
2954 " 0 encode-int s\" #size-cells\" property"
2955 " s\" mdio\" device-name"
2956 " s\" fsl,mpc5200b-mdio\" encode-string"
2957 " s\" compatible\" property"
2958 " 0xf0003000 0x400 reg"
2960 " 0x5 encode-int encode+"
2961 " 0x3 encode-int encode+"
2962 " s\" interrupts\" property"
2966 /* Check for a PHY device node - if missing then create one and
2967 * give it's phandle to the ethernet node */
2968 node = call_prom("finddevice", 1, 1,
2969 ADDR("/builtin/mdio/ethernet-phy"));
2970 if (!PHANDLE_VALID(node)) {
2971 prom_printf("Adding Ethernet PHY node\n");
2972 call_prom("interpret", 1, 1,
2973 " s\" /builtin/mdio\" find-device"
2975 " s\" ethernet-phy\" device-name"
2976 " 0x10 encode-int s\" reg\" property"
2980 " s\" /builtin/ethernet\" find-device"
2982 " s\" phy-handle\" property"
2987 static void __init fixup_device_tree_efika(void)
2989 int sound_irq[3] = { 2, 2, 0 };
2990 int bcomm_irq[3*16] = { 3,0,0, 3,1,0, 3,2,0, 3,3,0,
2991 3,4,0, 3,5,0, 3,6,0, 3,7,0,
2992 3,8,0, 3,9,0, 3,10,0, 3,11,0,
2993 3,12,0, 3,13,0, 3,14,0, 3,15,0 };
2998 /* Check if we're really running on a EFIKA */
2999 node = call_prom("finddevice", 1, 1, ADDR("/"));
3000 if (!PHANDLE_VALID(node))
3003 rv = prom_getprop(node, "model", prop, sizeof(prop));
3004 if (rv == PROM_ERROR)
3006 if (prom_strcmp(prop, "EFIKA5K2"))
3009 prom_printf("Applying EFIKA device tree fixups\n");
3011 /* Claiming to be 'chrp' is death */
3012 node = call_prom("finddevice", 1, 1, ADDR("/"));
3013 rv = prom_getprop(node, "device_type", prop, sizeof(prop));
3014 if (rv != PROM_ERROR && (prom_strcmp(prop, "chrp") == 0))
3015 prom_setprop(node, "/", "device_type", "efika", sizeof("efika"));
3017 /* CODEGEN,description is exposed in /proc/cpuinfo so
3019 rv = prom_getprop(node, "CODEGEN,description", prop, sizeof(prop));
3020 if (rv != PROM_ERROR && (prom_strstr(prop, "CHRP")))
3021 prom_setprop(node, "/", "CODEGEN,description",
3022 "Efika 5200B PowerPC System",
3023 sizeof("Efika 5200B PowerPC System"));
3025 /* Fixup bestcomm interrupts property */
3026 node = call_prom("finddevice", 1, 1, ADDR("/builtin/bestcomm"));
3027 if (PHANDLE_VALID(node)) {
3028 len = prom_getproplen(node, "interrupts");
3030 prom_printf("Fixing bestcomm interrupts property\n");
3031 prom_setprop(node, "/builtin/bestcom", "interrupts",
3032 bcomm_irq, sizeof(bcomm_irq));
3036 /* Fixup sound interrupts property */
3037 node = call_prom("finddevice", 1, 1, ADDR("/builtin/sound"));
3038 if (PHANDLE_VALID(node)) {
3039 rv = prom_getprop(node, "interrupts", prop, sizeof(prop));
3040 if (rv == PROM_ERROR) {
3041 prom_printf("Adding sound interrupts property\n");
3042 prom_setprop(node, "/builtin/sound", "interrupts",
3043 sound_irq, sizeof(sound_irq));
3047 /* Make sure ethernet phy-handle property exists */
3048 fixup_device_tree_efika_add_phy();
3051 #define fixup_device_tree_efika()
3054 #ifdef CONFIG_PPC_PASEMI_NEMO
3056 * CFE supplied on Nemo is broken in several ways, biggest
3057 * problem is that it reassigns ISA interrupts to unused mpic ints.
3058 * Add an interrupt-controller property for the io-bridge to use
3059 * and correct the ints so we can attach them to an irq_domain
3061 static void __init fixup_device_tree_pasemi(void)
3063 u32 interrupts[2], parent, rval, val = 0;
3064 char *name, *pci_name;
3067 /* Find the root pci node */
3068 name = "/pxp@0,e0000000";
3069 iob = call_prom("finddevice", 1, 1, ADDR(name));
3070 if (!PHANDLE_VALID(iob))
3073 /* check if interrupt-controller node set yet */
3074 if (prom_getproplen(iob, "interrupt-controller") !=PROM_ERROR)
3077 prom_printf("adding interrupt-controller property for SB600...\n");
3079 prom_setprop(iob, name, "interrupt-controller", &val, 0);
3081 pci_name = "/pxp@0,e0000000/pci@11";
3082 node = call_prom("finddevice", 1, 1, ADDR(pci_name));
3085 for( ; prom_next_node(&node); ) {
3086 /* scan each node for one with an interrupt */
3087 if (!PHANDLE_VALID(node))
3090 rval = prom_getproplen(node, "interrupts");
3091 if (rval == 0 || rval == PROM_ERROR)
3094 prom_getprop(node, "interrupts", &interrupts, sizeof(interrupts));
3095 if ((interrupts[0] < 212) || (interrupts[0] > 222))
3098 /* found a node, update both interrupts and interrupt-parent */
3099 if ((interrupts[0] >= 212) && (interrupts[0] <= 215))
3100 interrupts[0] -= 203;
3101 if ((interrupts[0] >= 216) && (interrupts[0] <= 220))
3102 interrupts[0] -= 213;
3103 if (interrupts[0] == 221)
3105 if (interrupts[0] == 222)
3108 prom_setprop(node, pci_name, "interrupts", interrupts,
3109 sizeof(interrupts));
3110 prom_setprop(node, pci_name, "interrupt-parent", &parent,
3115 * The io-bridge has device_type set to 'io-bridge' change it to 'isa'
3116 * so that generic isa-bridge code can add the SB600 and its on-board
3119 name = "/pxp@0,e0000000/io-bridge@0";
3120 iob = call_prom("finddevice", 1, 1, ADDR(name));
3121 if (!PHANDLE_VALID(iob))
3124 /* device_type is already set, just change it. */
3126 prom_printf("Changing device_type of SB600 node...\n");
3128 prom_setprop(iob, name, "device_type", "isa", sizeof("isa"));
3130 #else /* !CONFIG_PPC_PASEMI_NEMO */
3131 static inline void fixup_device_tree_pasemi(void) { }
3134 static void __init fixup_device_tree(void)
3136 fixup_device_tree_maple();
3137 fixup_device_tree_maple_memory_controller();
3138 fixup_device_tree_chrp();
3139 fixup_device_tree_pmac();
3140 fixup_device_tree_efika();
3141 fixup_device_tree_pasemi();
3144 static void __init prom_find_boot_cpu(void)
3151 if (prom_getprop(prom.chosen, "cpu", &rval, sizeof(rval)) <= 0)
3153 prom_cpu = be32_to_cpu(rval);
3155 cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);
3157 if (!PHANDLE_VALID(cpu_pkg))
3160 prom_getprop(cpu_pkg, "reg", &rval, sizeof(rval));
3161 prom.cpu = be32_to_cpu(rval);
3163 prom_debug("Booting CPU hw index = %d\n", prom.cpu);
3166 static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
3168 #ifdef CONFIG_BLK_DEV_INITRD
3169 if (r3 && r4 && r4 != 0xdeadbeef) {
3172 prom_initrd_start = is_kernel_addr(r3) ? __pa(r3) : r3;
3173 prom_initrd_end = prom_initrd_start + r4;
3175 val = cpu_to_be64(prom_initrd_start);
3176 prom_setprop(prom.chosen, "/chosen", "linux,initrd-start",
3178 val = cpu_to_be64(prom_initrd_end);
3179 prom_setprop(prom.chosen, "/chosen", "linux,initrd-end",
3182 reserve_mem(prom_initrd_start,
3183 prom_initrd_end - prom_initrd_start);
3185 prom_debug("initrd_start=0x%lx\n", prom_initrd_start);
3186 prom_debug("initrd_end=0x%lx\n", prom_initrd_end);
3188 #endif /* CONFIG_BLK_DEV_INITRD */
3192 #ifdef CONFIG_RELOCATABLE
3193 static void reloc_toc(void)
3197 static void unreloc_toc(void)
3201 static void __reloc_toc(unsigned long offset, unsigned long nr_entries)
3204 unsigned long *toc_entry;
3206 /* Get the start of the TOC by using r2 directly. */
3207 asm volatile("addi %0,2,-0x8000" : "=b" (toc_entry));
3209 for (i = 0; i < nr_entries; i++) {
3210 *toc_entry = *toc_entry + offset;
3215 static void reloc_toc(void)
3217 unsigned long offset = reloc_offset();
3218 unsigned long nr_entries =
3219 (__prom_init_toc_end - __prom_init_toc_start) / sizeof(long);
3221 __reloc_toc(offset, nr_entries);
3226 static void unreloc_toc(void)
3228 unsigned long offset = reloc_offset();
3229 unsigned long nr_entries =
3230 (__prom_init_toc_end - __prom_init_toc_start) / sizeof(long);
3234 __reloc_toc(-offset, nr_entries);
3239 #ifdef CONFIG_PPC_SVM
3241 * Perform the Enter Secure Mode ultracall.
3243 static int enter_secure_mode(unsigned long kbase, unsigned long fdt)
3245 register unsigned long r3 asm("r3") = UV_ESM;
3246 register unsigned long r4 asm("r4") = kbase;
3247 register unsigned long r5 asm("r5") = fdt;
3249 asm volatile("sc 2" : "+r"(r3) : "r"(r4), "r"(r5));
3255 * Call the Ultravisor to transfer us to secure memory if we have an ESM blob.
3257 static void setup_secure_guest(unsigned long kbase, unsigned long fdt)
3261 if (!prom_svm_enable)
3264 /* Switch to secure mode. */
3265 prom_printf("Switching to secure mode.\n");
3268 * The ultravisor will do an integrity check of the kernel image but we
3269 * relocated it so the check will fail. Restore the original image by
3270 * relocating it back to the kernel virtual base address.
3272 if (IS_ENABLED(CONFIG_RELOCATABLE))
3273 relocate(KERNELBASE);
3275 ret = enter_secure_mode(kbase, fdt);
3277 /* Relocate the kernel again. */
3278 if (IS_ENABLED(CONFIG_RELOCATABLE))
3281 if (ret != U_SUCCESS) {
3282 prom_printf("Returned %d from switching to secure mode.\n", ret);
3283 prom_rtas_os_term("Switch to secure mode failed.\n");
3287 static void setup_secure_guest(unsigned long kbase, unsigned long fdt)
3290 #endif /* CONFIG_PPC_SVM */
3293 * We enter here early on, when the Open Firmware prom is still
3294 * handling exceptions and the MMU hash table for us.
3297 unsigned long __init prom_init(unsigned long r3, unsigned long r4,
3299 unsigned long r6, unsigned long r7,
3300 unsigned long kbase)
3305 unsigned long offset = reloc_offset();
3312 * First zero the BSS
3314 memset(&__bss_start, 0, __bss_stop - __bss_start);
3317 * Init interface to Open Firmware, get some node references,
3320 prom_init_client_services(pp);
3323 * See if this OF is old enough that we need to do explicit maps
3324 * and other workarounds
3329 * Init prom stdout device
3333 prom_printf("Preparing to boot %s", linux_banner);
3336 * Get default machine type. At this point, we do not differentiate
3337 * between pSeries SMP and pSeries LPAR
3339 of_platform = prom_find_machine_type();
3340 prom_printf("Detected machine type: %x\n", of_platform);
3342 #ifndef CONFIG_NONSTATIC_KERNEL
3343 /* Bail if this is a kdump kernel. */
3344 if (PHYSICAL_START > 0)
3345 prom_panic("Error: You can't boot a kdump kernel from OF!\n");
3349 * Check for an initrd
3351 prom_check_initrd(r3, r4);
3354 * Do early parsing of command line
3356 early_cmdline_parse();
3358 #ifdef CONFIG_PPC_PSERIES
3360 * On pSeries, inform the firmware about our capabilities
3362 if (of_platform == PLATFORM_PSERIES ||
3363 of_platform == PLATFORM_PSERIES_LPAR)
3364 prom_send_capabilities();
3368 * Copy the CPU hold code
3370 if (of_platform != PLATFORM_POWERMAC)
3371 copy_and_flush(0, kbase, 0x100, 0);
3374 * Initialize memory management within prom_init
3379 * Determine which cpu is actually running right _now_
3381 prom_find_boot_cpu();
3384 * Initialize display devices
3386 prom_check_displays();
3388 #if defined(CONFIG_PPC64) && defined(__BIG_ENDIAN__)
3390 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
3391 * that uses the allocator, we need to make sure we get the top of memory
3392 * available for us here...
3394 if (of_platform == PLATFORM_PSERIES)
3395 prom_initialize_tce_table();
3399 * On non-powermacs, try to instantiate RTAS. PowerMacs don't
3400 * have a usable RTAS implementation.
3402 if (of_platform != PLATFORM_POWERMAC)
3403 prom_instantiate_rtas();
3406 /* instantiate sml */
3407 prom_instantiate_sml();
3411 * On non-powermacs, put all CPUs in spin-loops.
3413 * PowerMacs use a different mechanism to spin CPUs
3415 * (This must be done after instanciating RTAS)
3417 if (of_platform != PLATFORM_POWERMAC)
3421 * Fill in some infos for use by the kernel later on
3423 if (prom_memory_limit) {
3424 __be64 val = cpu_to_be64(prom_memory_limit);
3425 prom_setprop(prom.chosen, "/chosen", "linux,memory-limit",
3430 prom_setprop(prom.chosen, "/chosen", "linux,iommu-off",
3433 if (prom_iommu_force_on)
3434 prom_setprop(prom.chosen, "/chosen", "linux,iommu-force-on",
3437 if (prom_tce_alloc_start) {
3438 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-start",
3439 &prom_tce_alloc_start,
3440 sizeof(prom_tce_alloc_start));
3441 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-end",
3442 &prom_tce_alloc_end,
3443 sizeof(prom_tce_alloc_end));
3448 * Fixup any known bugs in the device-tree
3450 fixup_device_tree();
3453 * Now finally create the flattened device-tree
3455 prom_printf("copying OF device tree...\n");
3456 flatten_device_tree();
3459 * in case stdin is USB and still active on IBM machines...
3460 * Unfortunately quiesce crashes on some powermacs if we have
3461 * closed stdin already (in particular the powerbook 101).
3463 if (of_platform != PLATFORM_POWERMAC)
3467 * Call OF "quiesce" method to shut down pending DMA's from
3470 prom_printf("Quiescing Open Firmware ...\n");
3471 call_prom("quiesce", 0, 0);
3474 * And finally, call the kernel passing it the flattened device
3475 * tree and NULL as r5, thus triggering the new entry point which
3476 * is common to us and kexec
3478 hdr = dt_header_start;
3480 prom_printf("Booting Linux via __start() @ 0x%lx ...\n", kbase);
3481 prom_debug("->dt_header_start=0x%lx\n", hdr);
3484 reloc_got2(-offset);
3489 /* Move to secure memory if we're supposed to be secure guests. */
3490 setup_secure_guest(kbase, hdr);
3492 __start(hdr, kbase, 0, 0, 0, 0, 0);