2 * Procedures for interfacing to Open Firmware.
4 * Paul Mackerras August 1996.
5 * Copyright (C) 1996-2005 Paul Mackerras.
7 * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
8 * {engebret|bergner}@us.ibm.com
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
19 #include <linux/kernel.h>
20 #include <linux/string.h>
21 #include <linux/init.h>
22 #include <linux/threads.h>
23 #include <linux/spinlock.h>
24 #include <linux/types.h>
25 #include <linux/pci.h>
26 #include <linux/proc_fs.h>
27 #include <linux/stringify.h>
28 #include <linux/delay.h>
29 #include <linux/initrd.h>
30 #include <linux/bitops.h>
34 #include <asm/processor.h>
38 #include <asm/system.h>
40 #include <asm/pgtable.h>
42 #include <asm/iommu.h>
43 #include <asm/btext.h>
44 #include <asm/sections.h>
45 #include <asm/machdep.h>
47 #include <linux/linux_logo.h>
50 * Properties whose value is longer than this get excluded from our
51 * copy of the device tree. This value does need to be big enough to
52 * ensure that we don't lose things like the interrupt-map property
53 * on a PCI-PCI bridge.
55 #define MAX_PROPERTY_LENGTH (1UL * 1024 * 1024)
58 * Eventually bump that one up
60 #define DEVTREE_CHUNK_SIZE 0x100000
63 * This is the size of the local memory reserve map that gets copied
64 * into the boot params passed to the kernel. That size is totally
65 * flexible as the kernel just reads the list until it encounters an
66 * entry with size 0, so it can be changed without breaking binary
69 #define MEM_RESERVE_MAP_SIZE 8
72 * prom_init() is called very early on, before the kernel text
73 * and data have been mapped to KERNELBASE. At this point the code
74 * is running at whatever address it has been loaded at.
75 * On ppc32 we compile with -mrelocatable, which means that references
76 * to extern and static variables get relocated automatically.
77 * On ppc64 we have to relocate the references explicitly with
78 * RELOC. (Note that strings count as static variables.)
80 * Because OF may have mapped I/O devices into the area starting at
81 * KERNELBASE, particularly on CHRP machines, we can't safely call
82 * OF once the kernel has been mapped to KERNELBASE. Therefore all
83 * OF calls must be done within prom_init().
85 * ADDR is used in calls to call_prom. The 4th and following
86 * arguments to call_prom should be 32-bit values.
87 * On ppc64, 64 bit values are truncated to 32 bits (and
88 * fortunately don't get interpreted as two arguments).
91 #define RELOC(x) (*PTRRELOC(&(x)))
92 #define ADDR(x) (u32) add_reloc_offset((unsigned long)(x))
93 #define OF_WORKAROUNDS 0
96 #define ADDR(x) (u32) (x)
97 #define OF_WORKAROUNDS of_workarounds
101 #define OF_WA_CLAIM 1 /* do phys/virt claim separately, then map */
102 #define OF_WA_LONGTRAIL 2 /* work around longtrail bugs */
104 #define PROM_BUG() do { \
105 prom_printf("kernel BUG at %s line 0x%x!\n", \
106 RELOC(__FILE__), __LINE__); \
107 __asm__ __volatile__(".long " BUG_ILLEGAL_INSTR); \
111 #define prom_debug(x...) prom_printf(x)
113 #define prom_debug(x...)
117 typedef u32 prom_arg_t;
135 struct mem_map_entry {
142 extern void __start(unsigned long r3, unsigned long r4, unsigned long r5);
145 extern int enter_prom(struct prom_args *args, unsigned long entry);
147 static inline int enter_prom(struct prom_args *args, unsigned long entry)
149 return ((int (*)(struct prom_args *))entry)(args);
153 extern void copy_and_flush(unsigned long dest, unsigned long src,
154 unsigned long size, unsigned long offset);
157 static struct prom_t __initdata prom;
159 static unsigned long prom_entry __initdata;
161 #define PROM_SCRATCH_SIZE 256
163 static char __initdata of_stdout_device[256];
164 static char __initdata prom_scratch[PROM_SCRATCH_SIZE];
166 static unsigned long __initdata dt_header_start;
167 static unsigned long __initdata dt_struct_start, dt_struct_end;
168 static unsigned long __initdata dt_string_start, dt_string_end;
170 static unsigned long __initdata prom_initrd_start, prom_initrd_end;
173 static int __initdata prom_iommu_force_on;
174 static int __initdata prom_iommu_off;
175 static unsigned long __initdata prom_tce_alloc_start;
176 static unsigned long __initdata prom_tce_alloc_end;
179 /* Platforms codes are now obsolete in the kernel. Now only used within this
180 * file and ultimately gone too. Feel free to change them if you need, they
181 * are not shared with anything outside of this file anymore
183 #define PLATFORM_PSERIES 0x0100
184 #define PLATFORM_PSERIES_LPAR 0x0101
185 #define PLATFORM_LPAR 0x0001
186 #define PLATFORM_POWERMAC 0x0400
187 #define PLATFORM_GENERIC 0x0500
189 static int __initdata of_platform;
191 static char __initdata prom_cmd_line[COMMAND_LINE_SIZE];
193 static unsigned long __initdata prom_memory_limit;
195 static unsigned long __initdata alloc_top;
196 static unsigned long __initdata alloc_top_high;
197 static unsigned long __initdata alloc_bottom;
198 static unsigned long __initdata rmo_top;
199 static unsigned long __initdata ram_top;
201 static struct mem_map_entry __initdata mem_reserve_map[MEM_RESERVE_MAP_SIZE];
202 static int __initdata mem_reserve_cnt;
204 static cell_t __initdata regbuf[1024];
208 * Error results ... some OF calls will return "-1" on error, some
209 * will return 0, some will return either. To simplify, here are
210 * macros to use with any ihandle or phandle return value to check if
214 #define PROM_ERROR (-1u)
215 #define PHANDLE_VALID(p) ((p) != 0 && (p) != PROM_ERROR)
216 #define IHANDLE_VALID(i) ((i) != 0 && (i) != PROM_ERROR)
219 /* This is the one and *ONLY* place where we actually call open
223 static int __init call_prom(const char *service, int nargs, int nret, ...)
226 struct prom_args args;
229 args.service = ADDR(service);
233 va_start(list, nret);
234 for (i = 0; i < nargs; i++)
235 args.args[i] = va_arg(list, prom_arg_t);
238 for (i = 0; i < nret; i++)
239 args.args[nargs+i] = 0;
241 if (enter_prom(&args, RELOC(prom_entry)) < 0)
244 return (nret > 0) ? args.args[nargs] : 0;
247 static int __init call_prom_ret(const char *service, int nargs, int nret,
248 prom_arg_t *rets, ...)
251 struct prom_args args;
254 args.service = ADDR(service);
258 va_start(list, rets);
259 for (i = 0; i < nargs; i++)
260 args.args[i] = va_arg(list, prom_arg_t);
263 for (i = 0; i < nret; i++)
264 args.args[nargs+i] = 0;
266 if (enter_prom(&args, RELOC(prom_entry)) < 0)
270 for (i = 1; i < nret; ++i)
271 rets[i-1] = args.args[nargs+i];
273 return (nret > 0) ? args.args[nargs] : 0;
277 static void __init prom_print(const char *msg)
280 struct prom_t *_prom = &RELOC(prom);
282 if (_prom->stdout == 0)
285 for (p = msg; *p != 0; p = q) {
286 for (q = p; *q != 0 && *q != '\n'; ++q)
289 call_prom("write", 3, 1, _prom->stdout, p, q - p);
293 call_prom("write", 3, 1, _prom->stdout, ADDR("\r\n"), 2);
298 static void __init prom_print_hex(unsigned long val)
300 int i, nibbles = sizeof(val)*2;
301 char buf[sizeof(val)*2+1];
302 struct prom_t *_prom = &RELOC(prom);
304 for (i = nibbles-1; i >= 0; i--) {
305 buf[i] = (val & 0xf) + '0';
307 buf[i] += ('a'-'0'-10);
311 call_prom("write", 3, 1, _prom->stdout, buf, nibbles);
315 static void __init prom_printf(const char *format, ...)
317 const char *p, *q, *s;
320 struct prom_t *_prom = &RELOC(prom);
322 va_start(args, format);
324 format = PTRRELOC(format);
326 for (p = format; *p != 0; p = q) {
327 for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
330 call_prom("write", 3, 1, _prom->stdout, p, q - p);
335 call_prom("write", 3, 1, _prom->stdout,
345 s = va_arg(args, const char *);
350 v = va_arg(args, unsigned long);
358 static unsigned int __init prom_claim(unsigned long virt, unsigned long size,
361 struct prom_t *_prom = &RELOC(prom);
363 if (align == 0 && (OF_WORKAROUNDS & OF_WA_CLAIM)) {
365 * Old OF requires we claim physical and virtual separately
366 * and then map explicitly (assuming virtual mode)
371 ret = call_prom_ret("call-method", 5, 2, &result,
372 ADDR("claim"), _prom->memory,
374 if (ret != 0 || result == -1)
376 ret = call_prom_ret("call-method", 5, 2, &result,
377 ADDR("claim"), _prom->mmumap,
380 call_prom("call-method", 4, 1, ADDR("release"),
381 _prom->memory, size, virt);
384 /* the 0x12 is M (coherence) + PP == read/write */
385 call_prom("call-method", 6, 1,
386 ADDR("map"), _prom->mmumap, 0x12, size, virt, virt);
389 return call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size,
393 static void __init __attribute__((noreturn)) prom_panic(const char *reason)
396 reason = PTRRELOC(reason);
399 /* Do not call exit because it clears the screen on pmac
400 * it also causes some sort of double-fault on early pmacs */
401 if (RELOC(of_platform) == PLATFORM_POWERMAC)
404 /* ToDo: should put up an SRC here on p/iSeries */
405 call_prom("exit", 0, 0);
407 for (;;) /* should never get here */
412 static int __init prom_next_node(phandle *nodep)
416 if ((node = *nodep) != 0
417 && (*nodep = call_prom("child", 1, 1, node)) != 0)
419 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
422 if ((node = call_prom("parent", 1, 1, node)) == 0)
424 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
429 static int inline prom_getprop(phandle node, const char *pname,
430 void *value, size_t valuelen)
432 return call_prom("getprop", 4, 1, node, ADDR(pname),
433 (u32)(unsigned long) value, (u32) valuelen);
436 static int inline prom_getproplen(phandle node, const char *pname)
438 return call_prom("getproplen", 2, 1, node, ADDR(pname));
441 static void add_string(char **str, const char *q)
451 static char *tohex(unsigned int x)
453 static char digits[] = "0123456789abcdef";
454 static char result[9];
461 result[i] = digits[x & 0xf];
463 } while (x != 0 && i > 0);
467 static int __init prom_setprop(phandle node, const char *nodename,
468 const char *pname, void *value, size_t valuelen)
472 if (!(OF_WORKAROUNDS & OF_WA_LONGTRAIL))
473 return call_prom("setprop", 4, 1, node, ADDR(pname),
474 (u32)(unsigned long) value, (u32) valuelen);
476 /* gah... setprop doesn't work on longtrail, have to use interpret */
478 add_string(&p, "dev");
479 add_string(&p, nodename);
480 add_string(&p, tohex((u32)(unsigned long) value));
481 add_string(&p, tohex(valuelen));
482 add_string(&p, tohex(ADDR(pname)));
483 add_string(&p, tohex(strlen(RELOC(pname))));
484 add_string(&p, "property");
486 return call_prom("interpret", 1, 1, (u32)(unsigned long) cmd);
489 /* We can't use the standard versions because of RELOC headaches. */
490 #define isxdigit(c) (('0' <= (c) && (c) <= '9') \
491 || ('a' <= (c) && (c) <= 'f') \
492 || ('A' <= (c) && (c) <= 'F'))
494 #define isdigit(c) ('0' <= (c) && (c) <= '9')
495 #define islower(c) ('a' <= (c) && (c) <= 'z')
496 #define toupper(c) (islower(c) ? ((c) - 'a' + 'A') : (c))
498 unsigned long prom_strtoul(const char *cp, const char **endp)
500 unsigned long result = 0, base = 10, value;
505 if (toupper(*cp) == 'X') {
511 while (isxdigit(*cp) &&
512 (value = isdigit(*cp) ? *cp - '0' : toupper(*cp) - 'A' + 10) < base) {
513 result = result * base + value;
523 unsigned long prom_memparse(const char *ptr, const char **retptr)
525 unsigned long ret = prom_strtoul(ptr, retptr);
529 * We can't use a switch here because GCC *may* generate a
530 * jump table which won't work, because we're not running at
531 * the address we're linked at.
533 if ('G' == **retptr || 'g' == **retptr)
536 if ('M' == **retptr || 'm' == **retptr)
539 if ('K' == **retptr || 'k' == **retptr)
551 * Early parsing of the command line passed to the kernel, used for
552 * "mem=x" and the options that affect the iommu
554 static void __init early_cmdline_parse(void)
556 struct prom_t *_prom = &RELOC(prom);
562 RELOC(prom_cmd_line[0]) = 0;
563 p = RELOC(prom_cmd_line);
564 if ((long)_prom->chosen > 0)
565 l = prom_getprop(_prom->chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
566 #ifdef CONFIG_CMDLINE
567 if (l <= 0 || p[0] == '\0') /* dbl check */
568 strlcpy(RELOC(prom_cmd_line),
569 RELOC(CONFIG_CMDLINE), sizeof(prom_cmd_line));
570 #endif /* CONFIG_CMDLINE */
571 prom_printf("command line: %s\n", RELOC(prom_cmd_line));
574 opt = strstr(RELOC(prom_cmd_line), RELOC("iommu="));
576 prom_printf("iommu opt is: %s\n", opt);
578 while (*opt && *opt == ' ')
580 if (!strncmp(opt, RELOC("off"), 3))
581 RELOC(prom_iommu_off) = 1;
582 else if (!strncmp(opt, RELOC("force"), 5))
583 RELOC(prom_iommu_force_on) = 1;
586 opt = strstr(RELOC(prom_cmd_line), RELOC("mem="));
589 RELOC(prom_memory_limit) = prom_memparse(opt, (const char **)&opt);
591 /* Align to 16 MB == size of ppc64 large page */
592 RELOC(prom_memory_limit) = ALIGN(RELOC(prom_memory_limit), 0x1000000);
597 #ifdef CONFIG_PPC_PSERIES
599 * There are two methods for telling firmware what our capabilities are.
600 * Newer machines have an "ibm,client-architecture-support" method on the
601 * root node. For older machines, we have to call the "process-elf-header"
602 * method in the /packages/elf-loader node, passing it a fake 32-bit
603 * ELF header containing a couple of PT_NOTE sections that contain
604 * structures that contain various information.
608 * New method - extensible architecture description vector.
610 * Because the description vector contains a mix of byte and word
611 * values, we declare it as an unsigned char array, and use this
612 * macro to put word values in.
614 #define W(x) ((x) >> 24) & 0xff, ((x) >> 16) & 0xff, \
615 ((x) >> 8) & 0xff, (x) & 0xff
617 /* Option vector bits - generic bits in byte 1 */
618 #define OV_IGNORE 0x80 /* ignore this vector */
619 #define OV_CESSATION_POLICY 0x40 /* halt if unsupported option present*/
621 /* Option vector 1: processor architectures supported */
622 #define OV1_PPC_2_00 0x80 /* set if we support PowerPC 2.00 */
623 #define OV1_PPC_2_01 0x40 /* set if we support PowerPC 2.01 */
624 #define OV1_PPC_2_02 0x20 /* set if we support PowerPC 2.02 */
625 #define OV1_PPC_2_03 0x10 /* set if we support PowerPC 2.03 */
626 #define OV1_PPC_2_04 0x08 /* set if we support PowerPC 2.04 */
627 #define OV1_PPC_2_05 0x04 /* set if we support PowerPC 2.05 */
628 #define OV1_PPC_2_06 0x02 /* set if we support PowerPC 2.06 */
630 /* Option vector 2: Open Firmware options supported */
631 #define OV2_REAL_MODE 0x20 /* set if we want OF in real mode */
633 /* Option vector 3: processor options supported */
634 #define OV3_FP 0x80 /* floating point */
635 #define OV3_VMX 0x40 /* VMX/Altivec */
636 #define OV3_DFP 0x20 /* decimal FP */
638 /* Option vector 5: PAPR/OF options supported */
639 #define OV5_LPAR 0x80 /* logical partitioning supported */
640 #define OV5_SPLPAR 0x40 /* shared-processor LPAR supported */
641 /* ibm,dynamic-reconfiguration-memory property supported */
642 #define OV5_DRCONF_MEMORY 0x20
643 #define OV5_LARGE_PAGES 0x10 /* large pages supported */
644 #define OV5_DONATE_DEDICATE_CPU 0x02 /* donate dedicated CPU support */
645 /* PCIe/MSI support. Without MSI full PCIe is not supported */
646 #ifdef CONFIG_PCI_MSI
647 #define OV5_MSI 0x01 /* PCIe/MSI support */
650 #endif /* CONFIG_PCI_MSI */
651 #ifdef CONFIG_PPC_SMLPAR
652 #define OV5_CMO 0x80 /* Cooperative Memory Overcommitment */
658 * The architecture vector has an array of PVR mask/value pairs,
659 * followed by # option vectors - 1, followed by the option vectors.
661 static unsigned char ibm_architecture_vec[] = {
662 W(0xfffe0000), W(0x003a0000), /* POWER5/POWER5+ */
663 W(0xffff0000), W(0x003e0000), /* POWER6 */
664 W(0xffff0000), W(0x003f0000), /* POWER7 */
665 W(0xffffffff), W(0x0f000003), /* all 2.06-compliant */
666 W(0xffffffff), W(0x0f000002), /* all 2.05-compliant */
667 W(0xfffffffe), W(0x0f000001), /* all 2.04-compliant and earlier */
668 5 - 1, /* 5 option vectors */
670 /* option vector 1: processor architectures supported */
672 0, /* don't ignore, don't halt */
673 OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 |
674 OV1_PPC_2_04 | OV1_PPC_2_05 | OV1_PPC_2_06,
676 /* option vector 2: Open Firmware options supported */
680 W(0xffffffff), /* real_base */
681 W(0xffffffff), /* real_size */
682 W(0xffffffff), /* virt_base */
683 W(0xffffffff), /* virt_size */
684 W(0xffffffff), /* load_base */
685 W(64), /* 64MB min RMA */
686 W(0xffffffff), /* full client load */
687 0, /* min RMA percentage of total RAM */
688 48, /* max log_2(hash table size) */
690 /* option vector 3: processor options supported */
692 0, /* don't ignore, don't halt */
693 OV3_FP | OV3_VMX | OV3_DFP,
695 /* option vector 4: IBM PAPR implementation */
699 /* option vector 5: PAPR/OF options */
701 0, /* don't ignore, don't halt */
702 OV5_LPAR | OV5_SPLPAR | OV5_LARGE_PAGES | OV5_DRCONF_MEMORY |
703 OV5_DONATE_DEDICATE_CPU | OV5_MSI,
708 /* Old method - ELF header with PT_NOTE sections */
709 static struct fake_elf {
716 char name[8]; /* "PowerPC" */
730 char name[24]; /* "IBM,RPA-Client-Config" */
744 .e_ident = { 0x7f, 'E', 'L', 'F',
745 ELFCLASS32, ELFDATA2MSB, EV_CURRENT },
746 .e_type = ET_EXEC, /* yeah right */
748 .e_version = EV_CURRENT,
749 .e_phoff = offsetof(struct fake_elf, phdr),
750 .e_phentsize = sizeof(Elf32_Phdr),
756 .p_offset = offsetof(struct fake_elf, chrpnote),
757 .p_filesz = sizeof(struct chrpnote)
760 .p_offset = offsetof(struct fake_elf, rpanote),
761 .p_filesz = sizeof(struct rpanote)
765 .namesz = sizeof("PowerPC"),
766 .descsz = sizeof(struct chrpdesc),
770 .real_mode = ~0U, /* ~0 means "don't care" */
779 .namesz = sizeof("IBM,RPA-Client-Config"),
780 .descsz = sizeof(struct rpadesc),
782 .name = "IBM,RPA-Client-Config",
785 .min_rmo_size = 64, /* in megabytes */
786 .min_rmo_percent = 0,
787 .max_pft_size = 48, /* 2^48 bytes max PFT size */
795 static void __init prom_send_capabilities(void)
797 ihandle elfloader, root;
800 root = call_prom("open", 1, 1, ADDR("/"));
802 /* try calling the ibm,client-architecture-support method */
803 prom_printf("Calling ibm,client-architecture...");
804 if (call_prom_ret("call-method", 3, 2, &ret,
805 ADDR("ibm,client-architecture-support"),
807 ADDR(ibm_architecture_vec)) == 0) {
808 /* the call exists... */
810 prom_printf("\nWARNING: ibm,client-architecture"
811 "-support call FAILED!\n");
812 call_prom("close", 1, 0, root);
813 prom_printf(" done\n");
816 call_prom("close", 1, 0, root);
819 /* no ibm,client-architecture-support call, try the old way */
820 elfloader = call_prom("open", 1, 1, ADDR("/packages/elf-loader"));
821 if (elfloader == 0) {
822 prom_printf("couldn't open /packages/elf-loader\n");
825 call_prom("call-method", 3, 1, ADDR("process-elf-header"),
826 elfloader, ADDR(&fake_elf));
827 call_prom("close", 1, 0, elfloader);
832 * Memory allocation strategy... our layout is normally:
834 * at 14Mb or more we have vmlinux, then a gap and initrd. In some
835 * rare cases, initrd might end up being before the kernel though.
836 * We assume this won't override the final kernel at 0, we have no
837 * provision to handle that in this version, but it should hopefully
840 * alloc_top is set to the top of RMO, eventually shrink down if the
843 * alloc_bottom is set to the top of kernel/initrd
845 * from there, allocations are done this way : rtas is allocated
846 * topmost, and the device-tree is allocated from the bottom. We try
847 * to grow the device-tree allocation as we progress. If we can't,
848 * then we fail, we don't currently have a facility to restart
849 * elsewhere, but that shouldn't be necessary.
851 * Note that calls to reserve_mem have to be done explicitly, memory
852 * allocated with either alloc_up or alloc_down isn't automatically
858 * Allocates memory in the RMO upward from the kernel/initrd
860 * When align is 0, this is a special case, it means to allocate in place
861 * at the current location of alloc_bottom or fail (that is basically
862 * extending the previous allocation). Used for the device-tree flattening
864 static unsigned long __init alloc_up(unsigned long size, unsigned long align)
866 unsigned long base = RELOC(alloc_bottom);
867 unsigned long addr = 0;
870 base = _ALIGN_UP(base, align);
871 prom_debug("alloc_up(%x, %x)\n", size, align);
872 if (RELOC(ram_top) == 0)
873 prom_panic("alloc_up() called with mem not initialized\n");
876 base = _ALIGN_UP(RELOC(alloc_bottom), align);
878 base = RELOC(alloc_bottom);
880 for(; (base + size) <= RELOC(alloc_top);
881 base = _ALIGN_UP(base + 0x100000, align)) {
882 prom_debug(" trying: 0x%x\n\r", base);
883 addr = (unsigned long)prom_claim(base, size, 0);
884 if (addr != PROM_ERROR && addr != 0)
892 RELOC(alloc_bottom) = addr;
894 prom_debug(" -> %x\n", addr);
895 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom));
896 prom_debug(" alloc_top : %x\n", RELOC(alloc_top));
897 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
898 prom_debug(" rmo_top : %x\n", RELOC(rmo_top));
899 prom_debug(" ram_top : %x\n", RELOC(ram_top));
905 * Allocates memory downward, either from top of RMO, or if highmem
906 * is set, from the top of RAM. Note that this one doesn't handle
907 * failures. It does claim memory if highmem is not set.
909 static unsigned long __init alloc_down(unsigned long size, unsigned long align,
912 unsigned long base, addr = 0;
914 prom_debug("alloc_down(%x, %x, %s)\n", size, align,
915 highmem ? RELOC("(high)") : RELOC("(low)"));
916 if (RELOC(ram_top) == 0)
917 prom_panic("alloc_down() called with mem not initialized\n");
920 /* Carve out storage for the TCE table. */
921 addr = _ALIGN_DOWN(RELOC(alloc_top_high) - size, align);
922 if (addr <= RELOC(alloc_bottom))
924 /* Will we bump into the RMO ? If yes, check out that we
925 * didn't overlap existing allocations there, if we did,
926 * we are dead, we must be the first in town !
928 if (addr < RELOC(rmo_top)) {
929 /* Good, we are first */
930 if (RELOC(alloc_top) == RELOC(rmo_top))
931 RELOC(alloc_top) = RELOC(rmo_top) = addr;
935 RELOC(alloc_top_high) = addr;
939 base = _ALIGN_DOWN(RELOC(alloc_top) - size, align);
940 for (; base > RELOC(alloc_bottom);
941 base = _ALIGN_DOWN(base - 0x100000, align)) {
942 prom_debug(" trying: 0x%x\n\r", base);
943 addr = (unsigned long)prom_claim(base, size, 0);
944 if (addr != PROM_ERROR && addr != 0)
950 RELOC(alloc_top) = addr;
953 prom_debug(" -> %x\n", addr);
954 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom));
955 prom_debug(" alloc_top : %x\n", RELOC(alloc_top));
956 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
957 prom_debug(" rmo_top : %x\n", RELOC(rmo_top));
958 prom_debug(" ram_top : %x\n", RELOC(ram_top));
966 static unsigned long __init prom_next_cell(int s, cell_t **cellp)
971 /* Ignore more than 2 cells */
972 while (s > sizeof(unsigned long) / 4) {
988 * Very dumb function for adding to the memory reserve list, but
989 * we don't need anything smarter at this point
991 * XXX Eventually check for collisions. They should NEVER happen.
992 * If problems seem to show up, it would be a good start to track
995 static void __init reserve_mem(u64 base, u64 size)
997 u64 top = base + size;
998 unsigned long cnt = RELOC(mem_reserve_cnt);
1003 /* We need to always keep one empty entry so that we
1004 * have our terminator with "size" set to 0 since we are
1005 * dumb and just copy this entire array to the boot params
1007 base = _ALIGN_DOWN(base, PAGE_SIZE);
1008 top = _ALIGN_UP(top, PAGE_SIZE);
1011 if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))
1012 prom_panic("Memory reserve map exhausted !\n");
1013 RELOC(mem_reserve_map)[cnt].base = base;
1014 RELOC(mem_reserve_map)[cnt].size = size;
1015 RELOC(mem_reserve_cnt) = cnt + 1;
1019 * Initialize memory allocation mechanism, parse "memory" nodes and
1020 * obtain that way the top of memory and RMO to setup out local allocator
1022 static void __init prom_init_mem(void)
1025 char *path, type[64];
1028 struct prom_t *_prom = &RELOC(prom);
1032 * We iterate the memory nodes to find
1033 * 1) top of RMO (first node)
1037 prom_getprop(_prom->root, "#address-cells", &rac, sizeof(rac));
1039 prom_getprop(_prom->root, "#size-cells", &rsc, sizeof(rsc));
1040 prom_debug("root_addr_cells: %x\n", (unsigned long) rac);
1041 prom_debug("root_size_cells: %x\n", (unsigned long) rsc);
1043 prom_debug("scanning memory:\n");
1044 path = RELOC(prom_scratch);
1046 for (node = 0; prom_next_node(&node); ) {
1048 prom_getprop(node, "device_type", type, sizeof(type));
1052 * CHRP Longtrail machines have no device_type
1053 * on the memory node, so check the name instead...
1055 prom_getprop(node, "name", type, sizeof(type));
1057 if (strcmp(type, RELOC("memory")))
1060 plen = prom_getprop(node, "reg", RELOC(regbuf), sizeof(regbuf));
1061 if (plen > sizeof(regbuf)) {
1062 prom_printf("memory node too large for buffer !\n");
1063 plen = sizeof(regbuf);
1066 endp = p + (plen / sizeof(cell_t));
1069 memset(path, 0, PROM_SCRATCH_SIZE);
1070 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
1071 prom_debug(" node %s :\n", path);
1072 #endif /* DEBUG_PROM */
1074 while ((endp - p) >= (rac + rsc)) {
1075 unsigned long base, size;
1077 base = prom_next_cell(rac, &p);
1078 size = prom_next_cell(rsc, &p);
1082 prom_debug(" %x %x\n", base, size);
1083 if (base == 0 && (RELOC(of_platform) & PLATFORM_LPAR))
1084 RELOC(rmo_top) = size;
1085 if ((base + size) > RELOC(ram_top))
1086 RELOC(ram_top) = base + size;
1090 RELOC(alloc_bottom) = PAGE_ALIGN((unsigned long)&RELOC(_end) + 0x4000);
1092 /* Check if we have an initrd after the kernel, if we do move our bottom
1095 if (RELOC(prom_initrd_start)) {
1096 if (RELOC(prom_initrd_end) > RELOC(alloc_bottom))
1097 RELOC(alloc_bottom) = PAGE_ALIGN(RELOC(prom_initrd_end));
1101 * If prom_memory_limit is set we reduce the upper limits *except* for
1102 * alloc_top_high. This must be the real top of RAM so we can put
1106 RELOC(alloc_top_high) = RELOC(ram_top);
1108 if (RELOC(prom_memory_limit)) {
1109 if (RELOC(prom_memory_limit) <= RELOC(alloc_bottom)) {
1110 prom_printf("Ignoring mem=%x <= alloc_bottom.\n",
1111 RELOC(prom_memory_limit));
1112 RELOC(prom_memory_limit) = 0;
1113 } else if (RELOC(prom_memory_limit) >= RELOC(ram_top)) {
1114 prom_printf("Ignoring mem=%x >= ram_top.\n",
1115 RELOC(prom_memory_limit));
1116 RELOC(prom_memory_limit) = 0;
1118 RELOC(ram_top) = RELOC(prom_memory_limit);
1119 RELOC(rmo_top) = min(RELOC(rmo_top), RELOC(prom_memory_limit));
1124 * Setup our top alloc point, that is top of RMO or top of
1125 * segment 0 when running non-LPAR.
1126 * Some RS64 machines have buggy firmware where claims up at
1127 * 1GB fail. Cap at 768MB as a workaround.
1128 * Since 768MB is plenty of room, and we need to cap to something
1129 * reasonable on 32-bit, cap at 768MB on all machines.
1131 if (!RELOC(rmo_top))
1132 RELOC(rmo_top) = RELOC(ram_top);
1133 RELOC(rmo_top) = min(0x30000000ul, RELOC(rmo_top));
1134 RELOC(alloc_top) = RELOC(rmo_top);
1135 RELOC(alloc_top_high) = RELOC(ram_top);
1137 prom_printf("memory layout at init:\n");
1138 prom_printf(" memory_limit : %x (16 MB aligned)\n", RELOC(prom_memory_limit));
1139 prom_printf(" alloc_bottom : %x\n", RELOC(alloc_bottom));
1140 prom_printf(" alloc_top : %x\n", RELOC(alloc_top));
1141 prom_printf(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
1142 prom_printf(" rmo_top : %x\n", RELOC(rmo_top));
1143 prom_printf(" ram_top : %x\n", RELOC(ram_top));
1148 * Allocate room for and instantiate RTAS
1150 static void __init prom_instantiate_rtas(void)
1154 u32 base, entry = 0;
1157 prom_debug("prom_instantiate_rtas: start...\n");
1159 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1160 prom_debug("rtas_node: %x\n", rtas_node);
1161 if (!PHANDLE_VALID(rtas_node))
1164 prom_getprop(rtas_node, "rtas-size", &size, sizeof(size));
1168 base = alloc_down(size, PAGE_SIZE, 0);
1170 prom_printf("RTAS allocation failed !\n");
1174 rtas_inst = call_prom("open", 1, 1, ADDR("/rtas"));
1175 if (!IHANDLE_VALID(rtas_inst)) {
1176 prom_printf("opening rtas package failed (%x)\n", rtas_inst);
1180 prom_printf("instantiating rtas at 0x%x...", base);
1182 if (call_prom_ret("call-method", 3, 2, &entry,
1183 ADDR("instantiate-rtas"),
1184 rtas_inst, base) != 0
1186 prom_printf(" failed\n");
1189 prom_printf(" done\n");
1191 reserve_mem(base, size);
1193 prom_setprop(rtas_node, "/rtas", "linux,rtas-base",
1194 &base, sizeof(base));
1195 prom_setprop(rtas_node, "/rtas", "linux,rtas-entry",
1196 &entry, sizeof(entry));
1198 prom_debug("rtas base = 0x%x\n", base);
1199 prom_debug("rtas entry = 0x%x\n", entry);
1200 prom_debug("rtas size = 0x%x\n", (long)size);
1202 prom_debug("prom_instantiate_rtas: end...\n");
1207 * Allocate room for and initialize TCE tables
1209 static void __init prom_initialize_tce_table(void)
1213 char compatible[64], type[64], model[64];
1214 char *path = RELOC(prom_scratch);
1216 u32 minalign, minsize;
1217 u64 tce_entry, *tce_entryp;
1218 u64 local_alloc_top, local_alloc_bottom;
1221 if (RELOC(prom_iommu_off))
1224 prom_debug("starting prom_initialize_tce_table\n");
1226 /* Cache current top of allocs so we reserve a single block */
1227 local_alloc_top = RELOC(alloc_top_high);
1228 local_alloc_bottom = local_alloc_top;
1230 /* Search all nodes looking for PHBs. */
1231 for (node = 0; prom_next_node(&node); ) {
1235 prom_getprop(node, "compatible",
1236 compatible, sizeof(compatible));
1237 prom_getprop(node, "device_type", type, sizeof(type));
1238 prom_getprop(node, "model", model, sizeof(model));
1240 if ((type[0] == 0) || (strstr(type, RELOC("pci")) == NULL))
1243 /* Keep the old logic intact to avoid regression. */
1244 if (compatible[0] != 0) {
1245 if ((strstr(compatible, RELOC("python")) == NULL) &&
1246 (strstr(compatible, RELOC("Speedwagon")) == NULL) &&
1247 (strstr(compatible, RELOC("Winnipeg")) == NULL))
1249 } else if (model[0] != 0) {
1250 if ((strstr(model, RELOC("ython")) == NULL) &&
1251 (strstr(model, RELOC("peedwagon")) == NULL) &&
1252 (strstr(model, RELOC("innipeg")) == NULL))
1256 if (prom_getprop(node, "tce-table-minalign", &minalign,
1257 sizeof(minalign)) == PROM_ERROR)
1259 if (prom_getprop(node, "tce-table-minsize", &minsize,
1260 sizeof(minsize)) == PROM_ERROR)
1261 minsize = 4UL << 20;
1264 * Even though we read what OF wants, we just set the table
1265 * size to 4 MB. This is enough to map 2GB of PCI DMA space.
1266 * By doing this, we avoid the pitfalls of trying to DMA to
1267 * MMIO space and the DMA alias hole.
1269 * On POWER4, firmware sets the TCE region by assuming
1270 * each TCE table is 8MB. Using this memory for anything
1271 * else will impact performance, so we always allocate 8MB.
1274 if (__is_processor(PV_POWER4) || __is_processor(PV_POWER4p))
1275 minsize = 8UL << 20;
1277 minsize = 4UL << 20;
1279 /* Align to the greater of the align or size */
1280 align = max(minalign, minsize);
1281 base = alloc_down(minsize, align, 1);
1283 prom_panic("ERROR, cannot find space for TCE table.\n");
1284 if (base < local_alloc_bottom)
1285 local_alloc_bottom = base;
1287 /* It seems OF doesn't null-terminate the path :-( */
1288 memset(path, 0, PROM_SCRATCH_SIZE);
1289 /* Call OF to setup the TCE hardware */
1290 if (call_prom("package-to-path", 3, 1, node,
1291 path, PROM_SCRATCH_SIZE-1) == PROM_ERROR) {
1292 prom_printf("package-to-path failed\n");
1295 /* Save away the TCE table attributes for later use. */
1296 prom_setprop(node, path, "linux,tce-base", &base, sizeof(base));
1297 prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize));
1299 prom_debug("TCE table: %s\n", path);
1300 prom_debug("\tnode = 0x%x\n", node);
1301 prom_debug("\tbase = 0x%x\n", base);
1302 prom_debug("\tsize = 0x%x\n", minsize);
1304 /* Initialize the table to have a one-to-one mapping
1305 * over the allocated size.
1307 tce_entryp = (u64 *)base;
1308 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) {
1309 tce_entry = (i << PAGE_SHIFT);
1311 *tce_entryp = tce_entry;
1314 prom_printf("opening PHB %s", path);
1315 phb_node = call_prom("open", 1, 1, path);
1317 prom_printf("... failed\n");
1319 prom_printf("... done\n");
1321 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
1322 phb_node, -1, minsize,
1323 (u32) base, (u32) (base >> 32));
1324 call_prom("close", 1, 0, phb_node);
1327 reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);
1329 /* These are only really needed if there is a memory limit in
1330 * effect, but we don't know so export them always. */
1331 RELOC(prom_tce_alloc_start) = local_alloc_bottom;
1332 RELOC(prom_tce_alloc_end) = local_alloc_top;
1334 /* Flag the first invalid entry */
1335 prom_debug("ending prom_initialize_tce_table\n");
1340 * With CHRP SMP we need to use the OF to start the other processors.
1341 * We can't wait until smp_boot_cpus (the OF is trashed by then)
1342 * so we have to put the processors into a holding pattern controlled
1343 * by the kernel (not OF) before we destroy the OF.
1345 * This uses a chunk of low memory, puts some holding pattern
1346 * code there and sends the other processors off to there until
1347 * smp_boot_cpus tells them to do something. The holding pattern
1348 * checks that address until its cpu # is there, when it is that
1349 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care
1350 * of setting those values.
1352 * We also use physical address 0x4 here to tell when a cpu
1353 * is in its holding pattern code.
1358 * We want to reference the copy of __secondary_hold_* in the
1359 * 0 - 0x100 address range
1361 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff)
1363 static void __init prom_hold_cpus(void)
1369 struct prom_t *_prom = &RELOC(prom);
1370 unsigned long *spinloop
1371 = (void *) LOW_ADDR(__secondary_hold_spinloop);
1372 unsigned long *acknowledge
1373 = (void *) LOW_ADDR(__secondary_hold_acknowledge);
1374 unsigned long secondary_hold = LOW_ADDR(__secondary_hold);
1376 prom_debug("prom_hold_cpus: start...\n");
1377 prom_debug(" 1) spinloop = 0x%x\n", (unsigned long)spinloop);
1378 prom_debug(" 1) *spinloop = 0x%x\n", *spinloop);
1379 prom_debug(" 1) acknowledge = 0x%x\n",
1380 (unsigned long)acknowledge);
1381 prom_debug(" 1) *acknowledge = 0x%x\n", *acknowledge);
1382 prom_debug(" 1) secondary_hold = 0x%x\n", secondary_hold);
1384 /* Set the common spinloop variable, so all of the secondary cpus
1385 * will block when they are awakened from their OF spinloop.
1386 * This must occur for both SMP and non SMP kernels, since OF will
1387 * be trashed when we move the kernel.
1392 for (node = 0; prom_next_node(&node); ) {
1394 prom_getprop(node, "device_type", type, sizeof(type));
1395 if (strcmp(type, RELOC("cpu")) != 0)
1398 /* Skip non-configured cpus. */
1399 if (prom_getprop(node, "status", type, sizeof(type)) > 0)
1400 if (strcmp(type, RELOC("okay")) != 0)
1404 prom_getprop(node, "reg", ®, sizeof(reg));
1406 prom_debug("cpu hw idx = 0x%x\n", reg);
1408 /* Init the acknowledge var which will be reset by
1409 * the secondary cpu when it awakens from its OF
1412 *acknowledge = (unsigned long)-1;
1414 if (reg != _prom->cpu) {
1415 /* Primary Thread of non-boot cpu */
1416 prom_printf("starting cpu hw idx %x... ", reg);
1417 call_prom("start-cpu", 3, 0, node,
1418 secondary_hold, reg);
1420 for (i = 0; (i < 100000000) &&
1421 (*acknowledge == ((unsigned long)-1)); i++ )
1424 if (*acknowledge == reg)
1425 prom_printf("done\n");
1427 prom_printf("failed: %x\n", *acknowledge);
1431 prom_printf("boot cpu hw idx %x\n", reg);
1432 #endif /* CONFIG_SMP */
1435 prom_debug("prom_hold_cpus: end...\n");
1439 static void __init prom_init_client_services(unsigned long pp)
1441 struct prom_t *_prom = &RELOC(prom);
1443 /* Get a handle to the prom entry point before anything else */
1444 RELOC(prom_entry) = pp;
1446 /* get a handle for the stdout device */
1447 _prom->chosen = call_prom("finddevice", 1, 1, ADDR("/chosen"));
1448 if (!PHANDLE_VALID(_prom->chosen))
1449 prom_panic("cannot find chosen"); /* msg won't be printed :( */
1451 /* get device tree root */
1452 _prom->root = call_prom("finddevice", 1, 1, ADDR("/"));
1453 if (!PHANDLE_VALID(_prom->root))
1454 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
1461 * For really old powermacs, we need to map things we claim.
1462 * For that, we need the ihandle of the mmu.
1463 * Also, on the longtrail, we need to work around other bugs.
1465 static void __init prom_find_mmu(void)
1467 struct prom_t *_prom = &RELOC(prom);
1471 oprom = call_prom("finddevice", 1, 1, ADDR("/openprom"));
1472 if (!PHANDLE_VALID(oprom))
1474 if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0)
1476 version[sizeof(version) - 1] = 0;
1477 /* XXX might need to add other versions here */
1478 if (strcmp(version, "Open Firmware, 1.0.5") == 0)
1479 of_workarounds = OF_WA_CLAIM;
1480 else if (strncmp(version, "FirmWorks,3.", 12) == 0) {
1481 of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL;
1482 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
1485 _prom->memory = call_prom("open", 1, 1, ADDR("/memory"));
1486 prom_getprop(_prom->chosen, "mmu", &_prom->mmumap,
1487 sizeof(_prom->mmumap));
1488 if (!IHANDLE_VALID(_prom->memory) || !IHANDLE_VALID(_prom->mmumap))
1489 of_workarounds &= ~OF_WA_CLAIM; /* hmmm */
1492 #define prom_find_mmu()
1495 static void __init prom_init_stdout(void)
1497 struct prom_t *_prom = &RELOC(prom);
1498 char *path = RELOC(of_stdout_device);
1502 if (prom_getprop(_prom->chosen, "stdout", &val, sizeof(val)) <= 0)
1503 prom_panic("cannot find stdout");
1505 _prom->stdout = val;
1507 /* Get the full OF pathname of the stdout device */
1508 memset(path, 0, 256);
1509 call_prom("instance-to-path", 3, 1, _prom->stdout, path, 255);
1510 val = call_prom("instance-to-package", 1, 1, _prom->stdout);
1511 prom_setprop(_prom->chosen, "/chosen", "linux,stdout-package",
1513 prom_printf("OF stdout device is: %s\n", RELOC(of_stdout_device));
1514 prom_setprop(_prom->chosen, "/chosen", "linux,stdout-path",
1515 path, strlen(path) + 1);
1517 /* If it's a display, note it */
1518 memset(type, 0, sizeof(type));
1519 prom_getprop(val, "device_type", type, sizeof(type));
1520 if (strcmp(type, RELOC("display")) == 0)
1521 prom_setprop(val, path, "linux,boot-display", NULL, 0);
1524 static void __init prom_close_stdin(void)
1526 struct prom_t *_prom = &RELOC(prom);
1529 if (prom_getprop(_prom->chosen, "stdin", &val, sizeof(val)) > 0)
1530 call_prom("close", 1, 0, val);
1533 static int __init prom_find_machine_type(void)
1535 struct prom_t *_prom = &RELOC(prom);
1543 /* Look for a PowerMac */
1544 len = prom_getprop(_prom->root, "compatible",
1545 compat, sizeof(compat)-1);
1549 char *p = &compat[i];
1553 if (strstr(p, RELOC("Power Macintosh")) ||
1554 strstr(p, RELOC("MacRISC")))
1555 return PLATFORM_POWERMAC;
1557 /* We must make sure we don't detect the IBM Cell
1558 * blades as pSeries due to some firmware issues,
1561 if (strstr(p, RELOC("IBM,CBEA")) ||
1562 strstr(p, RELOC("IBM,CPBW-1.0")))
1563 return PLATFORM_GENERIC;
1564 #endif /* CONFIG_PPC64 */
1569 /* If not a mac, try to figure out if it's an IBM pSeries or any other
1570 * PAPR compliant platform. We assume it is if :
1571 * - /device_type is "chrp" (please, do NOT use that for future
1575 len = prom_getprop(_prom->root, "device_type",
1576 compat, sizeof(compat)-1);
1578 return PLATFORM_GENERIC;
1579 if (strcmp(compat, RELOC("chrp")))
1580 return PLATFORM_GENERIC;
1582 /* Default to pSeries. We need to know if we are running LPAR */
1583 rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1584 if (!PHANDLE_VALID(rtas))
1585 return PLATFORM_GENERIC;
1586 x = prom_getproplen(rtas, "ibm,hypertas-functions");
1587 if (x != PROM_ERROR) {
1588 prom_debug("Hypertas detected, assuming LPAR !\n");
1589 return PLATFORM_PSERIES_LPAR;
1591 return PLATFORM_PSERIES;
1593 return PLATFORM_GENERIC;
1597 static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
1599 return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);
1603 * If we have a display that we don't know how to drive,
1604 * we will want to try to execute OF's open method for it
1605 * later. However, OF will probably fall over if we do that
1606 * we've taken over the MMU.
1607 * So we check whether we will need to open the display,
1608 * and if so, open it now.
1610 static void __init prom_check_displays(void)
1612 char type[16], *path;
1617 static unsigned char default_colors[] = {
1635 const unsigned char *clut;
1637 prom_debug("Looking for displays\n");
1638 for (node = 0; prom_next_node(&node); ) {
1639 memset(type, 0, sizeof(type));
1640 prom_getprop(node, "device_type", type, sizeof(type));
1641 if (strcmp(type, RELOC("display")) != 0)
1644 /* It seems OF doesn't null-terminate the path :-( */
1645 path = RELOC(prom_scratch);
1646 memset(path, 0, PROM_SCRATCH_SIZE);
1649 * leave some room at the end of the path for appending extra
1652 if (call_prom("package-to-path", 3, 1, node, path,
1653 PROM_SCRATCH_SIZE-10) == PROM_ERROR)
1655 prom_printf("found display : %s, opening... ", path);
1657 ih = call_prom("open", 1, 1, path);
1659 prom_printf("failed\n");
1664 prom_printf("done\n");
1665 prom_setprop(node, path, "linux,opened", NULL, 0);
1667 /* Setup a usable color table when the appropriate
1668 * method is available. Should update this to set-colors */
1669 clut = RELOC(default_colors);
1670 for (i = 0; i < 32; i++, clut += 3)
1671 if (prom_set_color(ih, i, clut[0], clut[1],
1675 #ifdef CONFIG_LOGO_LINUX_CLUT224
1676 clut = PTRRELOC(RELOC(logo_linux_clut224.clut));
1677 for (i = 0; i < RELOC(logo_linux_clut224.clutsize); i++, clut += 3)
1678 if (prom_set_color(ih, i + 32, clut[0], clut[1],
1681 #endif /* CONFIG_LOGO_LINUX_CLUT224 */
1686 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */
1687 static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end,
1688 unsigned long needed, unsigned long align)
1692 *mem_start = _ALIGN(*mem_start, align);
1693 while ((*mem_start + needed) > *mem_end) {
1694 unsigned long room, chunk;
1696 prom_debug("Chunk exhausted, claiming more at %x...\n",
1697 RELOC(alloc_bottom));
1698 room = RELOC(alloc_top) - RELOC(alloc_bottom);
1699 if (room > DEVTREE_CHUNK_SIZE)
1700 room = DEVTREE_CHUNK_SIZE;
1701 if (room < PAGE_SIZE)
1702 prom_panic("No memory for flatten_device_tree (no room)");
1703 chunk = alloc_up(room, 0);
1705 prom_panic("No memory for flatten_device_tree (claim failed)");
1706 *mem_end = RELOC(alloc_top);
1709 ret = (void *)*mem_start;
1710 *mem_start += needed;
1715 #define dt_push_token(token, mem_start, mem_end) \
1716 do { *((u32 *)make_room(mem_start, mem_end, 4, 4)) = token; } while(0)
1718 static unsigned long __init dt_find_string(char *str)
1722 s = os = (char *)RELOC(dt_string_start);
1724 while (s < (char *)RELOC(dt_string_end)) {
1725 if (strcmp(s, str) == 0)
1733 * The Open Firmware 1275 specification states properties must be 31 bytes or
1734 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
1736 #define MAX_PROPERTY_NAME 64
1738 static void __init scan_dt_build_strings(phandle node,
1739 unsigned long *mem_start,
1740 unsigned long *mem_end)
1742 char *prev_name, *namep, *sstart;
1746 sstart = (char *)RELOC(dt_string_start);
1748 /* get and store all property names */
1749 prev_name = RELOC("");
1751 /* 64 is max len of name including nul. */
1752 namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1);
1753 if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) {
1754 /* No more nodes: unwind alloc */
1755 *mem_start = (unsigned long)namep;
1760 if (strcmp(namep, RELOC("name")) == 0) {
1761 *mem_start = (unsigned long)namep;
1762 prev_name = RELOC("name");
1765 /* get/create string entry */
1766 soff = dt_find_string(namep);
1768 *mem_start = (unsigned long)namep;
1769 namep = sstart + soff;
1771 /* Trim off some if we can */
1772 *mem_start = (unsigned long)namep + strlen(namep) + 1;
1773 RELOC(dt_string_end) = *mem_start;
1778 /* do all our children */
1779 child = call_prom("child", 1, 1, node);
1780 while (child != 0) {
1781 scan_dt_build_strings(child, mem_start, mem_end);
1782 child = call_prom("peer", 1, 1, child);
1786 static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
1787 unsigned long *mem_end)
1790 char *namep, *prev_name, *sstart, *p, *ep, *lp, *path;
1792 unsigned char *valp;
1793 static char pname[MAX_PROPERTY_NAME];
1796 dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);
1798 /* get the node's full name */
1799 namep = (char *)*mem_start;
1800 room = *mem_end - *mem_start;
1803 l = call_prom("package-to-path", 3, 1, node, namep, room);
1805 /* Didn't fit? Get more room. */
1807 if (l >= *mem_end - *mem_start)
1808 namep = make_room(mem_start, mem_end, l+1, 1);
1809 call_prom("package-to-path", 3, 1, node, namep, l);
1813 /* Fixup an Apple bug where they have bogus \0 chars in the
1814 * middle of the path in some properties, and extract
1815 * the unit name (everything after the last '/').
1817 for (lp = p = namep, ep = namep + l; p < ep; p++) {
1824 *mem_start = _ALIGN((unsigned long)lp + 1, 4);
1827 /* get it again for debugging */
1828 path = RELOC(prom_scratch);
1829 memset(path, 0, PROM_SCRATCH_SIZE);
1830 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
1832 /* get and store all properties */
1833 prev_name = RELOC("");
1834 sstart = (char *)RELOC(dt_string_start);
1836 if (call_prom("nextprop", 3, 1, node, prev_name,
1841 if (strcmp(RELOC(pname), RELOC("name")) == 0) {
1842 prev_name = RELOC("name");
1846 /* find string offset */
1847 soff = dt_find_string(RELOC(pname));
1849 prom_printf("WARNING: Can't find string index for"
1850 " <%s>, node %s\n", RELOC(pname), path);
1853 prev_name = sstart + soff;
1856 l = call_prom("getproplen", 2, 1, node, RELOC(pname));
1859 if (l == PROM_ERROR)
1861 if (l > MAX_PROPERTY_LENGTH) {
1862 prom_printf("WARNING: ignoring large property ");
1863 /* It seems OF doesn't null-terminate the path :-( */
1864 prom_printf("[%s] ", path);
1865 prom_printf("%s length 0x%x\n", RELOC(pname), l);
1869 /* push property head */
1870 dt_push_token(OF_DT_PROP, mem_start, mem_end);
1871 dt_push_token(l, mem_start, mem_end);
1872 dt_push_token(soff, mem_start, mem_end);
1874 /* push property content */
1875 valp = make_room(mem_start, mem_end, l, 4);
1876 call_prom("getprop", 4, 1, node, RELOC(pname), valp, l);
1877 *mem_start = _ALIGN(*mem_start, 4);
1880 /* Add a "linux,phandle" property. */
1881 soff = dt_find_string(RELOC("linux,phandle"));
1883 prom_printf("WARNING: Can't find string index for"
1884 " <linux-phandle> node %s\n", path);
1886 dt_push_token(OF_DT_PROP, mem_start, mem_end);
1887 dt_push_token(4, mem_start, mem_end);
1888 dt_push_token(soff, mem_start, mem_end);
1889 valp = make_room(mem_start, mem_end, 4, 4);
1890 *(u32 *)valp = node;
1893 /* do all our children */
1894 child = call_prom("child", 1, 1, node);
1895 while (child != 0) {
1896 scan_dt_build_struct(child, mem_start, mem_end);
1897 child = call_prom("peer", 1, 1, child);
1900 dt_push_token(OF_DT_END_NODE, mem_start, mem_end);
1903 static void __init flatten_device_tree(void)
1906 unsigned long mem_start, mem_end, room;
1907 struct boot_param_header *hdr;
1908 struct prom_t *_prom = &RELOC(prom);
1913 * Check how much room we have between alloc top & bottom (+/- a
1914 * few pages), crop to 4Mb, as this is our "chuck" size
1916 room = RELOC(alloc_top) - RELOC(alloc_bottom) - 0x4000;
1917 if (room > DEVTREE_CHUNK_SIZE)
1918 room = DEVTREE_CHUNK_SIZE;
1919 prom_debug("starting device tree allocs at %x\n", RELOC(alloc_bottom));
1921 /* Now try to claim that */
1922 mem_start = (unsigned long)alloc_up(room, PAGE_SIZE);
1924 prom_panic("Can't allocate initial device-tree chunk\n");
1925 mem_end = RELOC(alloc_top);
1927 /* Get root of tree */
1928 root = call_prom("peer", 1, 1, (phandle)0);
1929 if (root == (phandle)0)
1930 prom_panic ("couldn't get device tree root\n");
1932 /* Build header and make room for mem rsv map */
1933 mem_start = _ALIGN(mem_start, 4);
1934 hdr = make_room(&mem_start, &mem_end,
1935 sizeof(struct boot_param_header), 4);
1936 RELOC(dt_header_start) = (unsigned long)hdr;
1937 rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8);
1939 /* Start of strings */
1940 mem_start = PAGE_ALIGN(mem_start);
1941 RELOC(dt_string_start) = mem_start;
1942 mem_start += 4; /* hole */
1944 /* Add "linux,phandle" in there, we'll need it */
1945 namep = make_room(&mem_start, &mem_end, 16, 1);
1946 strcpy(namep, RELOC("linux,phandle"));
1947 mem_start = (unsigned long)namep + strlen(namep) + 1;
1949 /* Build string array */
1950 prom_printf("Building dt strings...\n");
1951 scan_dt_build_strings(root, &mem_start, &mem_end);
1952 RELOC(dt_string_end) = mem_start;
1954 /* Build structure */
1955 mem_start = PAGE_ALIGN(mem_start);
1956 RELOC(dt_struct_start) = mem_start;
1957 prom_printf("Building dt structure...\n");
1958 scan_dt_build_struct(root, &mem_start, &mem_end);
1959 dt_push_token(OF_DT_END, &mem_start, &mem_end);
1960 RELOC(dt_struct_end) = PAGE_ALIGN(mem_start);
1963 hdr->boot_cpuid_phys = _prom->cpu;
1964 hdr->magic = OF_DT_HEADER;
1965 hdr->totalsize = RELOC(dt_struct_end) - RELOC(dt_header_start);
1966 hdr->off_dt_struct = RELOC(dt_struct_start) - RELOC(dt_header_start);
1967 hdr->off_dt_strings = RELOC(dt_string_start) - RELOC(dt_header_start);
1968 hdr->dt_strings_size = RELOC(dt_string_end) - RELOC(dt_string_start);
1969 hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - RELOC(dt_header_start);
1970 hdr->version = OF_DT_VERSION;
1971 /* Version 16 is not backward compatible */
1972 hdr->last_comp_version = 0x10;
1974 /* Copy the reserve map in */
1975 memcpy(rsvmap, RELOC(mem_reserve_map), sizeof(mem_reserve_map));
1980 prom_printf("reserved memory map:\n");
1981 for (i = 0; i < RELOC(mem_reserve_cnt); i++)
1982 prom_printf(" %x - %x\n",
1983 RELOC(mem_reserve_map)[i].base,
1984 RELOC(mem_reserve_map)[i].size);
1987 /* Bump mem_reserve_cnt to cause further reservations to fail
1988 * since it's too late.
1990 RELOC(mem_reserve_cnt) = MEM_RESERVE_MAP_SIZE;
1992 prom_printf("Device tree strings 0x%x -> 0x%x\n",
1993 RELOC(dt_string_start), RELOC(dt_string_end));
1994 prom_printf("Device tree struct 0x%x -> 0x%x\n",
1995 RELOC(dt_struct_start), RELOC(dt_struct_end));
1999 #ifdef CONFIG_PPC_MAPLE
2000 /* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property.
2001 * The values are bad, and it doesn't even have the right number of cells. */
2002 static void __init fixup_device_tree_maple(void)
2005 u32 rloc = 0x01002000; /* IO space; PCI device = 4 */
2009 name = "/ht@0/isa@4";
2010 isa = call_prom("finddevice", 1, 1, ADDR(name));
2011 if (!PHANDLE_VALID(isa)) {
2012 name = "/ht@0/isa@6";
2013 isa = call_prom("finddevice", 1, 1, ADDR(name));
2014 rloc = 0x01003000; /* IO space; PCI device = 6 */
2016 if (!PHANDLE_VALID(isa))
2019 if (prom_getproplen(isa, "ranges") != 12)
2021 if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges))
2025 if (isa_ranges[0] != 0x1 ||
2026 isa_ranges[1] != 0xf4000000 ||
2027 isa_ranges[2] != 0x00010000)
2030 prom_printf("Fixing up bogus ISA range on Maple/Apache...\n");
2032 isa_ranges[0] = 0x1;
2033 isa_ranges[1] = 0x0;
2034 isa_ranges[2] = rloc;
2035 isa_ranges[3] = 0x0;
2036 isa_ranges[4] = 0x0;
2037 isa_ranges[5] = 0x00010000;
2038 prom_setprop(isa, name, "ranges",
2039 isa_ranges, sizeof(isa_ranges));
2042 #define CPC925_MC_START 0xf8000000
2043 #define CPC925_MC_LENGTH 0x1000000
2044 /* The values for memory-controller don't have right number of cells */
2045 static void __init fixup_device_tree_maple_memory_controller(void)
2049 char *name = "/hostbridge@f8000000";
2050 struct prom_t *_prom = &RELOC(prom);
2053 mc = call_prom("finddevice", 1, 1, ADDR(name));
2054 if (!PHANDLE_VALID(mc))
2057 if (prom_getproplen(mc, "reg") != 8)
2060 prom_getprop(_prom->root, "#address-cells", &ac, sizeof(ac));
2061 prom_getprop(_prom->root, "#size-cells", &sc, sizeof(sc));
2062 if ((ac != 2) || (sc != 2))
2065 if (prom_getprop(mc, "reg", mc_reg, sizeof(mc_reg)) == PROM_ERROR)
2068 if (mc_reg[0] != CPC925_MC_START || mc_reg[1] != CPC925_MC_LENGTH)
2071 prom_printf("Fixing up bogus hostbridge on Maple...\n");
2074 mc_reg[1] = CPC925_MC_START;
2076 mc_reg[3] = CPC925_MC_LENGTH;
2077 prom_setprop(mc, name, "reg", mc_reg, sizeof(mc_reg));
2080 #define fixup_device_tree_maple()
2081 #define fixup_device_tree_maple_memory_controller()
2084 #ifdef CONFIG_PPC_CHRP
2086 * Pegasos and BriQ lacks the "ranges" property in the isa node
2087 * Pegasos needs decimal IRQ 14/15, not hexadecimal
2088 * Pegasos has the IDE configured in legacy mode, but advertised as native
2090 static void __init fixup_device_tree_chrp(void)
2094 u32 rloc = 0x01006000; /* IO space; PCI device = 12 */
2098 name = "/pci@80000000/isa@c";
2099 ph = call_prom("finddevice", 1, 1, ADDR(name));
2100 if (!PHANDLE_VALID(ph)) {
2101 name = "/pci@ff500000/isa@6";
2102 ph = call_prom("finddevice", 1, 1, ADDR(name));
2103 rloc = 0x01003000; /* IO space; PCI device = 6 */
2105 if (PHANDLE_VALID(ph)) {
2106 rc = prom_getproplen(ph, "ranges");
2107 if (rc == 0 || rc == PROM_ERROR) {
2108 prom_printf("Fixing up missing ISA range on Pegasos...\n");
2115 prop[5] = 0x00010000;
2116 prom_setprop(ph, name, "ranges", prop, sizeof(prop));
2120 name = "/pci@80000000/ide@C,1";
2121 ph = call_prom("finddevice", 1, 1, ADDR(name));
2122 if (PHANDLE_VALID(ph)) {
2123 prom_printf("Fixing up IDE interrupt on Pegasos...\n");
2126 prom_setprop(ph, name, "interrupts", prop, 2*sizeof(u32));
2127 prom_printf("Fixing up IDE class-code on Pegasos...\n");
2128 rc = prom_getprop(ph, "class-code", prop, sizeof(u32));
2129 if (rc == sizeof(u32)) {
2131 prom_setprop(ph, name, "class-code", prop, sizeof(u32));
2136 #define fixup_device_tree_chrp()
2139 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
2140 static void __init fixup_device_tree_pmac(void)
2142 phandle u3, i2c, mpic;
2147 /* Some G5s have a missing interrupt definition, fix it up here */
2148 u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
2149 if (!PHANDLE_VALID(u3))
2151 i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
2152 if (!PHANDLE_VALID(i2c))
2154 mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
2155 if (!PHANDLE_VALID(mpic))
2158 /* check if proper rev of u3 */
2159 if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev))
2162 if (u3_rev < 0x35 || u3_rev > 0x39)
2164 /* does it need fixup ? */
2165 if (prom_getproplen(i2c, "interrupts") > 0)
2168 prom_printf("fixing up bogus interrupts for u3 i2c...\n");
2170 /* interrupt on this revision of u3 is number 0 and level */
2173 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts",
2174 &interrupts, sizeof(interrupts));
2176 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
2177 &parent, sizeof(parent));
2180 #define fixup_device_tree_pmac()
2183 #ifdef CONFIG_PPC_EFIKA
2185 * The MPC5200 FEC driver requires an phy-handle property to tell it how
2186 * to talk to the phy. If the phy-handle property is missing, then this
2187 * function is called to add the appropriate nodes and link it to the
2190 static void __init fixup_device_tree_efika_add_phy(void)
2196 /* Check if /builtin/ethernet exists - bail if it doesn't */
2197 node = call_prom("finddevice", 1, 1, ADDR("/builtin/ethernet"));
2198 if (!PHANDLE_VALID(node))
2201 /* Check if the phy-handle property exists - bail if it does */
2202 rv = prom_getprop(node, "phy-handle", prop, sizeof(prop));
2207 * At this point the ethernet device doesn't have a phy described.
2208 * Now we need to add the missing phy node and linkage
2211 /* Check for an MDIO bus node - if missing then create one */
2212 node = call_prom("finddevice", 1, 1, ADDR("/builtin/mdio"));
2213 if (!PHANDLE_VALID(node)) {
2214 prom_printf("Adding Ethernet MDIO node\n");
2215 call_prom("interpret", 1, 1,
2216 " s\" /builtin\" find-device"
2218 " 1 encode-int s\" #address-cells\" property"
2219 " 0 encode-int s\" #size-cells\" property"
2220 " s\" mdio\" device-name"
2221 " s\" fsl,mpc5200b-mdio\" encode-string"
2222 " s\" compatible\" property"
2223 " 0xf0003000 0x400 reg"
2225 " 0x5 encode-int encode+"
2226 " 0x3 encode-int encode+"
2227 " s\" interrupts\" property"
2231 /* Check for a PHY device node - if missing then create one and
2232 * give it's phandle to the ethernet node */
2233 node = call_prom("finddevice", 1, 1,
2234 ADDR("/builtin/mdio/ethernet-phy"));
2235 if (!PHANDLE_VALID(node)) {
2236 prom_printf("Adding Ethernet PHY node\n");
2237 call_prom("interpret", 1, 1,
2238 " s\" /builtin/mdio\" find-device"
2240 " s\" ethernet-phy\" device-name"
2241 " 0x10 encode-int s\" reg\" property"
2245 " s\" /builtin/ethernet\" find-device"
2247 " s\" phy-handle\" property"
2252 static void __init fixup_device_tree_efika(void)
2254 int sound_irq[3] = { 2, 2, 0 };
2255 int bcomm_irq[3*16] = { 3,0,0, 3,1,0, 3,2,0, 3,3,0,
2256 3,4,0, 3,5,0, 3,6,0, 3,7,0,
2257 3,8,0, 3,9,0, 3,10,0, 3,11,0,
2258 3,12,0, 3,13,0, 3,14,0, 3,15,0 };
2263 /* Check if we're really running on a EFIKA */
2264 node = call_prom("finddevice", 1, 1, ADDR("/"));
2265 if (!PHANDLE_VALID(node))
2268 rv = prom_getprop(node, "model", prop, sizeof(prop));
2269 if (rv == PROM_ERROR)
2271 if (strcmp(prop, "EFIKA5K2"))
2274 prom_printf("Applying EFIKA device tree fixups\n");
2276 /* Claiming to be 'chrp' is death */
2277 node = call_prom("finddevice", 1, 1, ADDR("/"));
2278 rv = prom_getprop(node, "device_type", prop, sizeof(prop));
2279 if (rv != PROM_ERROR && (strcmp(prop, "chrp") == 0))
2280 prom_setprop(node, "/", "device_type", "efika", sizeof("efika"));
2282 /* CODEGEN,description is exposed in /proc/cpuinfo so
2284 rv = prom_getprop(node, "CODEGEN,description", prop, sizeof(prop));
2285 if (rv != PROM_ERROR && (strstr(prop, "CHRP")))
2286 prom_setprop(node, "/", "CODEGEN,description",
2287 "Efika 5200B PowerPC System",
2288 sizeof("Efika 5200B PowerPC System"));
2290 /* Fixup bestcomm interrupts property */
2291 node = call_prom("finddevice", 1, 1, ADDR("/builtin/bestcomm"));
2292 if (PHANDLE_VALID(node)) {
2293 len = prom_getproplen(node, "interrupts");
2295 prom_printf("Fixing bestcomm interrupts property\n");
2296 prom_setprop(node, "/builtin/bestcom", "interrupts",
2297 bcomm_irq, sizeof(bcomm_irq));
2301 /* Fixup sound interrupts property */
2302 node = call_prom("finddevice", 1, 1, ADDR("/builtin/sound"));
2303 if (PHANDLE_VALID(node)) {
2304 rv = prom_getprop(node, "interrupts", prop, sizeof(prop));
2305 if (rv == PROM_ERROR) {
2306 prom_printf("Adding sound interrupts property\n");
2307 prom_setprop(node, "/builtin/sound", "interrupts",
2308 sound_irq, sizeof(sound_irq));
2312 /* Make sure ethernet phy-handle property exists */
2313 fixup_device_tree_efika_add_phy();
2316 #define fixup_device_tree_efika()
2319 static void __init fixup_device_tree(void)
2321 fixup_device_tree_maple();
2322 fixup_device_tree_maple_memory_controller();
2323 fixup_device_tree_chrp();
2324 fixup_device_tree_pmac();
2325 fixup_device_tree_efika();
2328 static void __init prom_find_boot_cpu(void)
2330 struct prom_t *_prom = &RELOC(prom);
2336 if (prom_getprop(_prom->chosen, "cpu", &prom_cpu, sizeof(prom_cpu)) <= 0)
2339 cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);
2341 prom_getprop(cpu_pkg, "reg", &getprop_rval, sizeof(getprop_rval));
2342 _prom->cpu = getprop_rval;
2344 prom_debug("Booting CPU hw index = 0x%x\n", _prom->cpu);
2347 static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
2349 #ifdef CONFIG_BLK_DEV_INITRD
2350 struct prom_t *_prom = &RELOC(prom);
2352 if (r3 && r4 && r4 != 0xdeadbeef) {
2355 RELOC(prom_initrd_start) = is_kernel_addr(r3) ? __pa(r3) : r3;
2356 RELOC(prom_initrd_end) = RELOC(prom_initrd_start) + r4;
2358 val = RELOC(prom_initrd_start);
2359 prom_setprop(_prom->chosen, "/chosen", "linux,initrd-start",
2361 val = RELOC(prom_initrd_end);
2362 prom_setprop(_prom->chosen, "/chosen", "linux,initrd-end",
2365 reserve_mem(RELOC(prom_initrd_start),
2366 RELOC(prom_initrd_end) - RELOC(prom_initrd_start));
2368 prom_debug("initrd_start=0x%x\n", RELOC(prom_initrd_start));
2369 prom_debug("initrd_end=0x%x\n", RELOC(prom_initrd_end));
2371 #endif /* CONFIG_BLK_DEV_INITRD */
2375 * We enter here early on, when the Open Firmware prom is still
2376 * handling exceptions and the MMU hash table for us.
2379 unsigned long __init prom_init(unsigned long r3, unsigned long r4,
2381 unsigned long r6, unsigned long r7,
2382 unsigned long kbase)
2384 struct prom_t *_prom;
2388 unsigned long offset = reloc_offset();
2392 _prom = &RELOC(prom);
2395 * First zero the BSS
2397 memset(&RELOC(__bss_start), 0, __bss_stop - __bss_start);
2400 * Init interface to Open Firmware, get some node references,
2403 prom_init_client_services(pp);
2406 * See if this OF is old enough that we need to do explicit maps
2407 * and other workarounds
2412 * Init prom stdout device
2416 prom_printf("Preparing to boot %s", RELOC(linux_banner));
2419 * Get default machine type. At this point, we do not differentiate
2420 * between pSeries SMP and pSeries LPAR
2422 RELOC(of_platform) = prom_find_machine_type();
2424 #ifndef CONFIG_RELOCATABLE
2425 /* Bail if this is a kdump kernel. */
2426 if (PHYSICAL_START > 0)
2427 prom_panic("Error: You can't boot a kdump kernel from OF!\n");
2431 * Check for an initrd
2433 prom_check_initrd(r3, r4);
2435 #ifdef CONFIG_PPC_PSERIES
2437 * On pSeries, inform the firmware about our capabilities
2439 if (RELOC(of_platform) == PLATFORM_PSERIES ||
2440 RELOC(of_platform) == PLATFORM_PSERIES_LPAR)
2441 prom_send_capabilities();
2445 * Copy the CPU hold code
2447 if (RELOC(of_platform) != PLATFORM_POWERMAC)
2448 copy_and_flush(0, kbase, 0x100, 0);
2451 * Do early parsing of command line
2453 early_cmdline_parse();
2456 * Initialize memory management within prom_init
2461 * Determine which cpu is actually running right _now_
2463 prom_find_boot_cpu();
2466 * Initialize display devices
2468 prom_check_displays();
2472 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
2473 * that uses the allocator, we need to make sure we get the top of memory
2474 * available for us here...
2476 if (RELOC(of_platform) == PLATFORM_PSERIES)
2477 prom_initialize_tce_table();
2481 * On non-powermacs, try to instantiate RTAS and puts all CPUs
2482 * in spin-loops. PowerMacs don't have a working RTAS and use
2483 * a different way to spin CPUs
2485 if (RELOC(of_platform) != PLATFORM_POWERMAC) {
2486 prom_instantiate_rtas();
2491 * Fill in some infos for use by the kernel later on
2493 if (RELOC(prom_memory_limit))
2494 prom_setprop(_prom->chosen, "/chosen", "linux,memory-limit",
2495 &RELOC(prom_memory_limit),
2496 sizeof(prom_memory_limit));
2498 if (RELOC(prom_iommu_off))
2499 prom_setprop(_prom->chosen, "/chosen", "linux,iommu-off",
2502 if (RELOC(prom_iommu_force_on))
2503 prom_setprop(_prom->chosen, "/chosen", "linux,iommu-force-on",
2506 if (RELOC(prom_tce_alloc_start)) {
2507 prom_setprop(_prom->chosen, "/chosen", "linux,tce-alloc-start",
2508 &RELOC(prom_tce_alloc_start),
2509 sizeof(prom_tce_alloc_start));
2510 prom_setprop(_prom->chosen, "/chosen", "linux,tce-alloc-end",
2511 &RELOC(prom_tce_alloc_end),
2512 sizeof(prom_tce_alloc_end));
2517 * Fixup any known bugs in the device-tree
2519 fixup_device_tree();
2522 * Now finally create the flattened device-tree
2524 prom_printf("copying OF device tree...\n");
2525 flatten_device_tree();
2528 * in case stdin is USB and still active on IBM machines...
2529 * Unfortunately quiesce crashes on some powermacs if we have
2530 * closed stdin already (in particular the powerbook 101).
2532 if (RELOC(of_platform) != PLATFORM_POWERMAC)
2536 * Call OF "quiesce" method to shut down pending DMA's from
2539 prom_printf("Calling quiesce...\n");
2540 call_prom("quiesce", 0, 0);
2543 * And finally, call the kernel passing it the flattened device
2544 * tree and NULL as r5, thus triggering the new entry point which
2545 * is common to us and kexec
2547 hdr = RELOC(dt_header_start);
2548 prom_printf("returning from prom_init\n");
2549 prom_debug("->dt_header_start=0x%x\n", hdr);
2552 reloc_got2(-offset);
2555 __start(hdr, kbase, 0);