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 #ifdef CONFIG_LOGO_LINUX_CLUT224
48 #include <linux/linux_logo.h>
49 extern const struct linux_logo logo_linux_clut224;
53 * Properties whose value is longer than this get excluded from our
54 * copy of the device tree. This value does need to be big enough to
55 * ensure that we don't lose things like the interrupt-map property
56 * on a PCI-PCI bridge.
58 #define MAX_PROPERTY_LENGTH (1UL * 1024 * 1024)
61 * Eventually bump that one up
63 #define DEVTREE_CHUNK_SIZE 0x100000
66 * This is the size of the local memory reserve map that gets copied
67 * into the boot params passed to the kernel. That size is totally
68 * flexible as the kernel just reads the list until it encounters an
69 * entry with size 0, so it can be changed without breaking binary
72 #define MEM_RESERVE_MAP_SIZE 8
75 * prom_init() is called very early on, before the kernel text
76 * and data have been mapped to KERNELBASE. At this point the code
77 * is running at whatever address it has been loaded at.
78 * On ppc32 we compile with -mrelocatable, which means that references
79 * to extern and static variables get relocated automatically.
80 * On ppc64 we have to relocate the references explicitly with
81 * RELOC. (Note that strings count as static variables.)
83 * Because OF may have mapped I/O devices into the area starting at
84 * KERNELBASE, particularly on CHRP machines, we can't safely call
85 * OF once the kernel has been mapped to KERNELBASE. Therefore all
86 * OF calls must be done within prom_init().
88 * ADDR is used in calls to call_prom. The 4th and following
89 * arguments to call_prom should be 32-bit values.
90 * On ppc64, 64 bit values are truncated to 32 bits (and
91 * fortunately don't get interpreted as two arguments).
94 #define RELOC(x) (*PTRRELOC(&(x)))
95 #define ADDR(x) (u32) add_reloc_offset((unsigned long)(x))
96 #define OF_WORKAROUNDS 0
99 #define ADDR(x) (u32) (x)
100 #define OF_WORKAROUNDS of_workarounds
104 #define OF_WA_CLAIM 1 /* do phys/virt claim separately, then map */
105 #define OF_WA_LONGTRAIL 2 /* work around longtrail bugs */
107 #define PROM_BUG() do { \
108 prom_printf("kernel BUG at %s line 0x%x!\n", \
109 RELOC(__FILE__), __LINE__); \
110 __asm__ __volatile__(".long " BUG_ILLEGAL_INSTR); \
114 #define prom_debug(x...) prom_printf(x)
116 #define prom_debug(x...)
120 typedef u32 prom_arg_t;
138 struct mem_map_entry {
145 extern void __start(unsigned long r3, unsigned long r4, unsigned long r5);
148 extern int enter_prom(struct prom_args *args, unsigned long entry);
150 static inline int enter_prom(struct prom_args *args, unsigned long entry)
152 return ((int (*)(struct prom_args *))entry)(args);
156 extern void copy_and_flush(unsigned long dest, unsigned long src,
157 unsigned long size, unsigned long offset);
160 static struct prom_t __initdata prom;
162 static unsigned long prom_entry __initdata;
164 #define PROM_SCRATCH_SIZE 256
166 static char __initdata of_stdout_device[256];
167 static char __initdata prom_scratch[PROM_SCRATCH_SIZE];
169 static unsigned long __initdata dt_header_start;
170 static unsigned long __initdata dt_struct_start, dt_struct_end;
171 static unsigned long __initdata dt_string_start, dt_string_end;
173 static unsigned long __initdata prom_initrd_start, prom_initrd_end;
176 static int __initdata prom_iommu_force_on;
177 static int __initdata prom_iommu_off;
178 static unsigned long __initdata prom_tce_alloc_start;
179 static unsigned long __initdata prom_tce_alloc_end;
182 /* Platforms codes are now obsolete in the kernel. Now only used within this
183 * file and ultimately gone too. Feel free to change them if you need, they
184 * are not shared with anything outside of this file anymore
186 #define PLATFORM_PSERIES 0x0100
187 #define PLATFORM_PSERIES_LPAR 0x0101
188 #define PLATFORM_LPAR 0x0001
189 #define PLATFORM_POWERMAC 0x0400
190 #define PLATFORM_GENERIC 0x0500
192 static int __initdata of_platform;
194 static char __initdata prom_cmd_line[COMMAND_LINE_SIZE];
196 static unsigned long __initdata alloc_top;
197 static unsigned long __initdata alloc_top_high;
198 static unsigned long __initdata alloc_bottom;
199 static unsigned long __initdata rmo_top;
200 static unsigned long __initdata ram_top;
202 static struct mem_map_entry __initdata mem_reserve_map[MEM_RESERVE_MAP_SIZE];
203 static int __initdata mem_reserve_cnt;
205 static cell_t __initdata regbuf[1024];
208 #define MAX_CPU_THREADS 2
211 * Error results ... some OF calls will return "-1" on error, some
212 * will return 0, some will return either. To simplify, here are
213 * macros to use with any ihandle or phandle return value to check if
217 #define PROM_ERROR (-1u)
218 #define PHANDLE_VALID(p) ((p) != 0 && (p) != PROM_ERROR)
219 #define IHANDLE_VALID(i) ((i) != 0 && (i) != PROM_ERROR)
222 /* This is the one and *ONLY* place where we actually call open
226 static int __init call_prom(const char *service, int nargs, int nret, ...)
229 struct prom_args args;
232 args.service = ADDR(service);
236 va_start(list, nret);
237 for (i = 0; i < nargs; i++)
238 args.args[i] = va_arg(list, prom_arg_t);
241 for (i = 0; i < nret; i++)
242 args.args[nargs+i] = 0;
244 if (enter_prom(&args, RELOC(prom_entry)) < 0)
247 return (nret > 0) ? args.args[nargs] : 0;
250 static int __init call_prom_ret(const char *service, int nargs, int nret,
251 prom_arg_t *rets, ...)
254 struct prom_args args;
257 args.service = ADDR(service);
261 va_start(list, rets);
262 for (i = 0; i < nargs; i++)
263 args.args[i] = va_arg(list, prom_arg_t);
266 for (i = 0; i < nret; i++)
267 args.args[nargs+i] = 0;
269 if (enter_prom(&args, RELOC(prom_entry)) < 0)
273 for (i = 1; i < nret; ++i)
274 rets[i-1] = args.args[nargs+i];
276 return (nret > 0) ? args.args[nargs] : 0;
280 static void __init prom_print(const char *msg)
283 struct prom_t *_prom = &RELOC(prom);
285 if (_prom->stdout == 0)
288 for (p = msg; *p != 0; p = q) {
289 for (q = p; *q != 0 && *q != '\n'; ++q)
292 call_prom("write", 3, 1, _prom->stdout, p, q - p);
296 call_prom("write", 3, 1, _prom->stdout, ADDR("\r\n"), 2);
301 static void __init prom_print_hex(unsigned long val)
303 int i, nibbles = sizeof(val)*2;
304 char buf[sizeof(val)*2+1];
305 struct prom_t *_prom = &RELOC(prom);
307 for (i = nibbles-1; i >= 0; i--) {
308 buf[i] = (val & 0xf) + '0';
310 buf[i] += ('a'-'0'-10);
314 call_prom("write", 3, 1, _prom->stdout, buf, nibbles);
318 static void __init prom_printf(const char *format, ...)
320 const char *p, *q, *s;
323 struct prom_t *_prom = &RELOC(prom);
325 va_start(args, format);
327 format = PTRRELOC(format);
329 for (p = format; *p != 0; p = q) {
330 for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
333 call_prom("write", 3, 1, _prom->stdout, p, q - p);
338 call_prom("write", 3, 1, _prom->stdout,
348 s = va_arg(args, const char *);
353 v = va_arg(args, unsigned long);
361 static unsigned int __init prom_claim(unsigned long virt, unsigned long size,
364 struct prom_t *_prom = &RELOC(prom);
366 if (align == 0 && (OF_WORKAROUNDS & OF_WA_CLAIM)) {
368 * Old OF requires we claim physical and virtual separately
369 * and then map explicitly (assuming virtual mode)
374 ret = call_prom_ret("call-method", 5, 2, &result,
375 ADDR("claim"), _prom->memory,
377 if (ret != 0 || result == -1)
379 ret = call_prom_ret("call-method", 5, 2, &result,
380 ADDR("claim"), _prom->mmumap,
383 call_prom("call-method", 4, 1, ADDR("release"),
384 _prom->memory, size, virt);
387 /* the 0x12 is M (coherence) + PP == read/write */
388 call_prom("call-method", 6, 1,
389 ADDR("map"), _prom->mmumap, 0x12, size, virt, virt);
392 return call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size,
396 static void __init __attribute__((noreturn)) prom_panic(const char *reason)
399 reason = PTRRELOC(reason);
402 /* Do not call exit because it clears the screen on pmac
403 * it also causes some sort of double-fault on early pmacs */
404 if (RELOC(of_platform) == PLATFORM_POWERMAC)
407 /* ToDo: should put up an SRC here on p/iSeries */
408 call_prom("exit", 0, 0);
410 for (;;) /* should never get here */
415 static int __init prom_next_node(phandle *nodep)
419 if ((node = *nodep) != 0
420 && (*nodep = call_prom("child", 1, 1, node)) != 0)
422 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
425 if ((node = call_prom("parent", 1, 1, node)) == 0)
427 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
432 static int inline prom_getprop(phandle node, const char *pname,
433 void *value, size_t valuelen)
435 return call_prom("getprop", 4, 1, node, ADDR(pname),
436 (u32)(unsigned long) value, (u32) valuelen);
439 static int inline prom_getproplen(phandle node, const char *pname)
441 return call_prom("getproplen", 2, 1, node, ADDR(pname));
444 static void add_string(char **str, const char *q)
454 static char *tohex(unsigned int x)
456 static char digits[] = "0123456789abcdef";
457 static char result[9];
464 result[i] = digits[x & 0xf];
466 } while (x != 0 && i > 0);
470 static int __init prom_setprop(phandle node, const char *nodename,
471 const char *pname, void *value, size_t valuelen)
475 if (!(OF_WORKAROUNDS & OF_WA_LONGTRAIL))
476 return call_prom("setprop", 4, 1, node, ADDR(pname),
477 (u32)(unsigned long) value, (u32) valuelen);
479 /* gah... setprop doesn't work on longtrail, have to use interpret */
481 add_string(&p, "dev");
482 add_string(&p, nodename);
483 add_string(&p, tohex((u32)(unsigned long) value));
484 add_string(&p, tohex(valuelen));
485 add_string(&p, tohex(ADDR(pname)));
486 add_string(&p, tohex(strlen(RELOC(pname))));
487 add_string(&p, "property");
489 return call_prom("interpret", 1, 1, (u32)(unsigned long) cmd);
492 /* We can't use the standard versions because of RELOC headaches. */
493 #define isxdigit(c) (('0' <= (c) && (c) <= '9') \
494 || ('a' <= (c) && (c) <= 'f') \
495 || ('A' <= (c) && (c) <= 'F'))
497 #define isdigit(c) ('0' <= (c) && (c) <= '9')
498 #define islower(c) ('a' <= (c) && (c) <= 'z')
499 #define toupper(c) (islower(c) ? ((c) - 'a' + 'A') : (c))
501 unsigned long prom_strtoul(const char *cp, const char **endp)
503 unsigned long result = 0, base = 10, value;
508 if (toupper(*cp) == 'X') {
514 while (isxdigit(*cp) &&
515 (value = isdigit(*cp) ? *cp - '0' : toupper(*cp) - 'A' + 10) < base) {
516 result = result * base + value;
526 unsigned long prom_memparse(const char *ptr, const char **retptr)
528 unsigned long ret = prom_strtoul(ptr, retptr);
532 * We can't use a switch here because GCC *may* generate a
533 * jump table which won't work, because we're not running at
534 * the address we're linked at.
536 if ('G' == **retptr || 'g' == **retptr)
539 if ('M' == **retptr || 'm' == **retptr)
542 if ('K' == **retptr || 'k' == **retptr)
554 * Early parsing of the command line passed to the kernel, used for
555 * "mem=x" and the options that affect the iommu
557 static void __init early_cmdline_parse(void)
559 struct prom_t *_prom = &RELOC(prom);
566 RELOC(prom_cmd_line[0]) = 0;
567 p = RELOC(prom_cmd_line);
568 if ((long)_prom->chosen > 0)
569 l = prom_getprop(_prom->chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
570 #ifdef CONFIG_CMDLINE
571 if (l <= 0 || p[0] == '\0') /* dbl check */
572 strlcpy(RELOC(prom_cmd_line),
573 RELOC(CONFIG_CMDLINE), sizeof(prom_cmd_line));
574 #endif /* CONFIG_CMDLINE */
575 prom_printf("command line: %s\n", RELOC(prom_cmd_line));
578 opt = strstr(RELOC(prom_cmd_line), RELOC("iommu="));
580 prom_printf("iommu opt is: %s\n", opt);
582 while (*opt && *opt == ' ')
584 if (!strncmp(opt, RELOC("off"), 3))
585 RELOC(prom_iommu_off) = 1;
586 else if (!strncmp(opt, RELOC("force"), 5))
587 RELOC(prom_iommu_force_on) = 1;
592 #ifdef CONFIG_PPC_PSERIES
594 * There are two methods for telling firmware what our capabilities are.
595 * Newer machines have an "ibm,client-architecture-support" method on the
596 * root node. For older machines, we have to call the "process-elf-header"
597 * method in the /packages/elf-loader node, passing it a fake 32-bit
598 * ELF header containing a couple of PT_NOTE sections that contain
599 * structures that contain various information.
603 * New method - extensible architecture description vector.
605 * Because the description vector contains a mix of byte and word
606 * values, we declare it as an unsigned char array, and use this
607 * macro to put word values in.
609 #define W(x) ((x) >> 24) & 0xff, ((x) >> 16) & 0xff, \
610 ((x) >> 8) & 0xff, (x) & 0xff
612 /* Option vector bits - generic bits in byte 1 */
613 #define OV_IGNORE 0x80 /* ignore this vector */
614 #define OV_CESSATION_POLICY 0x40 /* halt if unsupported option present*/
616 /* Option vector 1: processor architectures supported */
617 #define OV1_PPC_2_00 0x80 /* set if we support PowerPC 2.00 */
618 #define OV1_PPC_2_01 0x40 /* set if we support PowerPC 2.01 */
619 #define OV1_PPC_2_02 0x20 /* set if we support PowerPC 2.02 */
620 #define OV1_PPC_2_03 0x10 /* set if we support PowerPC 2.03 */
621 #define OV1_PPC_2_04 0x08 /* set if we support PowerPC 2.04 */
622 #define OV1_PPC_2_05 0x04 /* set if we support PowerPC 2.05 */
624 /* Option vector 2: Open Firmware options supported */
625 #define OV2_REAL_MODE 0x20 /* set if we want OF in real mode */
627 /* Option vector 3: processor options supported */
628 #define OV3_FP 0x80 /* floating point */
629 #define OV3_VMX 0x40 /* VMX/Altivec */
630 #define OV3_DFP 0x20 /* decimal FP */
632 /* Option vector 5: PAPR/OF options supported */
633 #define OV5_LPAR 0x80 /* logical partitioning supported */
634 #define OV5_SPLPAR 0x40 /* shared-processor LPAR supported */
635 /* ibm,dynamic-reconfiguration-memory property supported */
636 #define OV5_DRCONF_MEMORY 0x20
637 #define OV5_LARGE_PAGES 0x10 /* large pages supported */
638 /* PCIe/MSI support. Without MSI full PCIe is not supported */
639 #ifdef CONFIG_PCI_MSI
640 #define OV5_MSI 0x01 /* PCIe/MSI support */
643 #endif /* CONFIG_PCI_MSI */
646 * The architecture vector has an array of PVR mask/value pairs,
647 * followed by # option vectors - 1, followed by the option vectors.
649 static unsigned char ibm_architecture_vec[] = {
650 W(0xfffe0000), W(0x003a0000), /* POWER5/POWER5+ */
651 W(0xffff0000), W(0x003e0000), /* POWER6 */
652 W(0xffffffff), W(0x0f000002), /* all 2.05-compliant */
653 W(0xfffffffe), W(0x0f000001), /* all 2.04-compliant and earlier */
654 5 - 1, /* 5 option vectors */
656 /* option vector 1: processor architectures supported */
658 0, /* don't ignore, don't halt */
659 OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 |
660 OV1_PPC_2_04 | OV1_PPC_2_05,
662 /* option vector 2: Open Firmware options supported */
666 W(0xffffffff), /* real_base */
667 W(0xffffffff), /* real_size */
668 W(0xffffffff), /* virt_base */
669 W(0xffffffff), /* virt_size */
670 W(0xffffffff), /* load_base */
671 W(64), /* 128MB min RMA */
672 W(0xffffffff), /* full client load */
673 0, /* min RMA percentage of total RAM */
674 48, /* max log_2(hash table size) */
676 /* option vector 3: processor options supported */
678 0, /* don't ignore, don't halt */
679 OV3_FP | OV3_VMX | OV3_DFP,
681 /* option vector 4: IBM PAPR implementation */
685 /* option vector 5: PAPR/OF options */
687 0, /* don't ignore, don't halt */
688 OV5_LPAR | OV5_SPLPAR | OV5_LARGE_PAGES | OV5_DRCONF_MEMORY | OV5_MSI,
691 /* Old method - ELF header with PT_NOTE sections */
692 static struct fake_elf {
699 char name[8]; /* "PowerPC" */
713 char name[24]; /* "IBM,RPA-Client-Config" */
727 .e_ident = { 0x7f, 'E', 'L', 'F',
728 ELFCLASS32, ELFDATA2MSB, EV_CURRENT },
729 .e_type = ET_EXEC, /* yeah right */
731 .e_version = EV_CURRENT,
732 .e_phoff = offsetof(struct fake_elf, phdr),
733 .e_phentsize = sizeof(Elf32_Phdr),
739 .p_offset = offsetof(struct fake_elf, chrpnote),
740 .p_filesz = sizeof(struct chrpnote)
743 .p_offset = offsetof(struct fake_elf, rpanote),
744 .p_filesz = sizeof(struct rpanote)
748 .namesz = sizeof("PowerPC"),
749 .descsz = sizeof(struct chrpdesc),
753 .real_mode = ~0U, /* ~0 means "don't care" */
762 .namesz = sizeof("IBM,RPA-Client-Config"),
763 .descsz = sizeof(struct rpadesc),
765 .name = "IBM,RPA-Client-Config",
768 .min_rmo_size = 64, /* in megabytes */
769 .min_rmo_percent = 0,
770 .max_pft_size = 48, /* 2^48 bytes max PFT size */
778 static void __init prom_send_capabilities(void)
780 ihandle elfloader, root;
783 root = call_prom("open", 1, 1, ADDR("/"));
785 /* try calling the ibm,client-architecture-support method */
786 if (call_prom_ret("call-method", 3, 2, &ret,
787 ADDR("ibm,client-architecture-support"),
789 ADDR(ibm_architecture_vec)) == 0) {
790 /* the call exists... */
792 prom_printf("WARNING: ibm,client-architecture"
793 "-support call FAILED!\n");
794 call_prom("close", 1, 0, root);
797 call_prom("close", 1, 0, root);
800 /* no ibm,client-architecture-support call, try the old way */
801 elfloader = call_prom("open", 1, 1, ADDR("/packages/elf-loader"));
802 if (elfloader == 0) {
803 prom_printf("couldn't open /packages/elf-loader\n");
806 call_prom("call-method", 3, 1, ADDR("process-elf-header"),
807 elfloader, ADDR(&fake_elf));
808 call_prom("close", 1, 0, elfloader);
813 * Memory allocation strategy... our layout is normally:
815 * at 14Mb or more we have vmlinux, then a gap and initrd. In some
816 * rare cases, initrd might end up being before the kernel though.
817 * We assume this won't override the final kernel at 0, we have no
818 * provision to handle that in this version, but it should hopefully
821 * alloc_top is set to the top of RMO, eventually shrink down if the
824 * alloc_bottom is set to the top of kernel/initrd
826 * from there, allocations are done this way : rtas is allocated
827 * topmost, and the device-tree is allocated from the bottom. We try
828 * to grow the device-tree allocation as we progress. If we can't,
829 * then we fail, we don't currently have a facility to restart
830 * elsewhere, but that shouldn't be necessary.
832 * Note that calls to reserve_mem have to be done explicitly, memory
833 * allocated with either alloc_up or alloc_down isn't automatically
839 * Allocates memory in the RMO upward from the kernel/initrd
841 * When align is 0, this is a special case, it means to allocate in place
842 * at the current location of alloc_bottom or fail (that is basically
843 * extending the previous allocation). Used for the device-tree flattening
845 static unsigned long __init alloc_up(unsigned long size, unsigned long align)
847 unsigned long base = RELOC(alloc_bottom);
848 unsigned long addr = 0;
851 base = _ALIGN_UP(base, align);
852 prom_debug("alloc_up(%x, %x)\n", size, align);
853 if (RELOC(ram_top) == 0)
854 prom_panic("alloc_up() called with mem not initialized\n");
857 base = _ALIGN_UP(RELOC(alloc_bottom), align);
859 base = RELOC(alloc_bottom);
861 for(; (base + size) <= RELOC(alloc_top);
862 base = _ALIGN_UP(base + 0x100000, align)) {
863 prom_debug(" trying: 0x%x\n\r", base);
864 addr = (unsigned long)prom_claim(base, size, 0);
865 if (addr != PROM_ERROR && addr != 0)
873 RELOC(alloc_bottom) = addr;
875 prom_debug(" -> %x\n", addr);
876 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom));
877 prom_debug(" alloc_top : %x\n", RELOC(alloc_top));
878 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
879 prom_debug(" rmo_top : %x\n", RELOC(rmo_top));
880 prom_debug(" ram_top : %x\n", RELOC(ram_top));
886 * Allocates memory downward, either from top of RMO, or if highmem
887 * is set, from the top of RAM. Note that this one doesn't handle
888 * failures. It does claim memory if highmem is not set.
890 static unsigned long __init alloc_down(unsigned long size, unsigned long align,
893 unsigned long base, addr = 0;
895 prom_debug("alloc_down(%x, %x, %s)\n", size, align,
896 highmem ? RELOC("(high)") : RELOC("(low)"));
897 if (RELOC(ram_top) == 0)
898 prom_panic("alloc_down() called with mem not initialized\n");
901 /* Carve out storage for the TCE table. */
902 addr = _ALIGN_DOWN(RELOC(alloc_top_high) - size, align);
903 if (addr <= RELOC(alloc_bottom))
905 /* Will we bump into the RMO ? If yes, check out that we
906 * didn't overlap existing allocations there, if we did,
907 * we are dead, we must be the first in town !
909 if (addr < RELOC(rmo_top)) {
910 /* Good, we are first */
911 if (RELOC(alloc_top) == RELOC(rmo_top))
912 RELOC(alloc_top) = RELOC(rmo_top) = addr;
916 RELOC(alloc_top_high) = addr;
920 base = _ALIGN_DOWN(RELOC(alloc_top) - size, align);
921 for (; base > RELOC(alloc_bottom);
922 base = _ALIGN_DOWN(base - 0x100000, align)) {
923 prom_debug(" trying: 0x%x\n\r", base);
924 addr = (unsigned long)prom_claim(base, size, 0);
925 if (addr != PROM_ERROR && addr != 0)
931 RELOC(alloc_top) = addr;
934 prom_debug(" -> %x\n", addr);
935 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom));
936 prom_debug(" alloc_top : %x\n", RELOC(alloc_top));
937 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
938 prom_debug(" rmo_top : %x\n", RELOC(rmo_top));
939 prom_debug(" ram_top : %x\n", RELOC(ram_top));
947 static unsigned long __init prom_next_cell(int s, cell_t **cellp)
952 /* Ignore more than 2 cells */
953 while (s > sizeof(unsigned long) / 4) {
969 * Very dumb function for adding to the memory reserve list, but
970 * we don't need anything smarter at this point
972 * XXX Eventually check for collisions. They should NEVER happen.
973 * If problems seem to show up, it would be a good start to track
976 static void __init reserve_mem(u64 base, u64 size)
978 u64 top = base + size;
979 unsigned long cnt = RELOC(mem_reserve_cnt);
984 /* We need to always keep one empty entry so that we
985 * have our terminator with "size" set to 0 since we are
986 * dumb and just copy this entire array to the boot params
988 base = _ALIGN_DOWN(base, PAGE_SIZE);
989 top = _ALIGN_UP(top, PAGE_SIZE);
992 if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))
993 prom_panic("Memory reserve map exhausted !\n");
994 RELOC(mem_reserve_map)[cnt].base = base;
995 RELOC(mem_reserve_map)[cnt].size = size;
996 RELOC(mem_reserve_cnt) = cnt + 1;
1000 * Initialize memory allocation mechanism, parse "memory" nodes and
1001 * obtain that way the top of memory and RMO to setup out local allocator
1003 static void __init prom_init_mem(void)
1006 char *path, type[64];
1009 struct prom_t *_prom = &RELOC(prom);
1013 * We iterate the memory nodes to find
1014 * 1) top of RMO (first node)
1018 prom_getprop(_prom->root, "#address-cells", &rac, sizeof(rac));
1020 prom_getprop(_prom->root, "#size-cells", &rsc, sizeof(rsc));
1021 prom_debug("root_addr_cells: %x\n", (unsigned long) rac);
1022 prom_debug("root_size_cells: %x\n", (unsigned long) rsc);
1024 prom_debug("scanning memory:\n");
1025 path = RELOC(prom_scratch);
1027 for (node = 0; prom_next_node(&node); ) {
1029 prom_getprop(node, "device_type", type, sizeof(type));
1033 * CHRP Longtrail machines have no device_type
1034 * on the memory node, so check the name instead...
1036 prom_getprop(node, "name", type, sizeof(type));
1038 if (strcmp(type, RELOC("memory")))
1041 plen = prom_getprop(node, "reg", RELOC(regbuf), sizeof(regbuf));
1042 if (plen > sizeof(regbuf)) {
1043 prom_printf("memory node too large for buffer !\n");
1044 plen = sizeof(regbuf);
1047 endp = p + (plen / sizeof(cell_t));
1050 memset(path, 0, PROM_SCRATCH_SIZE);
1051 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
1052 prom_debug(" node %s :\n", path);
1053 #endif /* DEBUG_PROM */
1055 while ((endp - p) >= (rac + rsc)) {
1056 unsigned long base, size;
1058 base = prom_next_cell(rac, &p);
1059 size = prom_next_cell(rsc, &p);
1063 prom_debug(" %x %x\n", base, size);
1064 if (base == 0 && (RELOC(of_platform) & PLATFORM_LPAR))
1065 RELOC(rmo_top) = size;
1066 if ((base + size) > RELOC(ram_top))
1067 RELOC(ram_top) = base + size;
1071 RELOC(alloc_bottom) = PAGE_ALIGN((unsigned long)&RELOC(_end) + 0x4000);
1073 /* Check if we have an initrd after the kernel, if we do move our bottom
1076 if (RELOC(prom_initrd_start)) {
1077 if (RELOC(prom_initrd_end) > RELOC(alloc_bottom))
1078 RELOC(alloc_bottom) = PAGE_ALIGN(RELOC(prom_initrd_end));
1082 * Setup our top alloc point, that is top of RMO or top of
1083 * segment 0 when running non-LPAR.
1084 * Some RS64 machines have buggy firmware where claims up at
1085 * 1GB fail. Cap at 768MB as a workaround.
1086 * Since 768MB is plenty of room, and we need to cap to something
1087 * reasonable on 32-bit, cap at 768MB on all machines.
1089 if (!RELOC(rmo_top))
1090 RELOC(rmo_top) = RELOC(ram_top);
1091 RELOC(rmo_top) = min(0x30000000ul, RELOC(rmo_top));
1092 RELOC(alloc_top) = RELOC(rmo_top);
1093 RELOC(alloc_top_high) = RELOC(ram_top);
1095 prom_printf("memory layout at init:\n");
1096 prom_printf(" alloc_bottom : %x\n", RELOC(alloc_bottom));
1097 prom_printf(" alloc_top : %x\n", RELOC(alloc_top));
1098 prom_printf(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
1099 prom_printf(" rmo_top : %x\n", RELOC(rmo_top));
1100 prom_printf(" ram_top : %x\n", RELOC(ram_top));
1105 * Allocate room for and instantiate RTAS
1107 static void __init prom_instantiate_rtas(void)
1111 u32 base, entry = 0;
1114 prom_debug("prom_instantiate_rtas: start...\n");
1116 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1117 prom_debug("rtas_node: %x\n", rtas_node);
1118 if (!PHANDLE_VALID(rtas_node))
1121 prom_getprop(rtas_node, "rtas-size", &size, sizeof(size));
1125 base = alloc_down(size, PAGE_SIZE, 0);
1127 prom_printf("RTAS allocation failed !\n");
1131 rtas_inst = call_prom("open", 1, 1, ADDR("/rtas"));
1132 if (!IHANDLE_VALID(rtas_inst)) {
1133 prom_printf("opening rtas package failed (%x)\n", rtas_inst);
1137 prom_printf("instantiating rtas at 0x%x ...", base);
1139 if (call_prom_ret("call-method", 3, 2, &entry,
1140 ADDR("instantiate-rtas"),
1141 rtas_inst, base) != 0
1143 prom_printf(" failed\n");
1146 prom_printf(" done\n");
1148 reserve_mem(base, size);
1150 prom_setprop(rtas_node, "/rtas", "linux,rtas-base",
1151 &base, sizeof(base));
1152 prom_setprop(rtas_node, "/rtas", "linux,rtas-entry",
1153 &entry, sizeof(entry));
1155 prom_debug("rtas base = 0x%x\n", base);
1156 prom_debug("rtas entry = 0x%x\n", entry);
1157 prom_debug("rtas size = 0x%x\n", (long)size);
1159 prom_debug("prom_instantiate_rtas: end...\n");
1164 * Allocate room for and initialize TCE tables
1166 static void __init prom_initialize_tce_table(void)
1170 char compatible[64], type[64], model[64];
1171 char *path = RELOC(prom_scratch);
1173 u32 minalign, minsize;
1174 u64 tce_entry, *tce_entryp;
1175 u64 local_alloc_top, local_alloc_bottom;
1178 if (RELOC(prom_iommu_off))
1181 prom_debug("starting prom_initialize_tce_table\n");
1183 /* Cache current top of allocs so we reserve a single block */
1184 local_alloc_top = RELOC(alloc_top_high);
1185 local_alloc_bottom = local_alloc_top;
1187 /* Search all nodes looking for PHBs. */
1188 for (node = 0; prom_next_node(&node); ) {
1192 prom_getprop(node, "compatible",
1193 compatible, sizeof(compatible));
1194 prom_getprop(node, "device_type", type, sizeof(type));
1195 prom_getprop(node, "model", model, sizeof(model));
1197 if ((type[0] == 0) || (strstr(type, RELOC("pci")) == NULL))
1200 /* Keep the old logic in tack to avoid regression. */
1201 if (compatible[0] != 0) {
1202 if ((strstr(compatible, RELOC("python")) == NULL) &&
1203 (strstr(compatible, RELOC("Speedwagon")) == NULL) &&
1204 (strstr(compatible, RELOC("Winnipeg")) == NULL))
1206 } else if (model[0] != 0) {
1207 if ((strstr(model, RELOC("ython")) == NULL) &&
1208 (strstr(model, RELOC("peedwagon")) == NULL) &&
1209 (strstr(model, RELOC("innipeg")) == NULL))
1213 if (prom_getprop(node, "tce-table-minalign", &minalign,
1214 sizeof(minalign)) == PROM_ERROR)
1216 if (prom_getprop(node, "tce-table-minsize", &minsize,
1217 sizeof(minsize)) == PROM_ERROR)
1218 minsize = 4UL << 20;
1221 * Even though we read what OF wants, we just set the table
1222 * size to 4 MB. This is enough to map 2GB of PCI DMA space.
1223 * By doing this, we avoid the pitfalls of trying to DMA to
1224 * MMIO space and the DMA alias hole.
1226 * On POWER4, firmware sets the TCE region by assuming
1227 * each TCE table is 8MB. Using this memory for anything
1228 * else will impact performance, so we always allocate 8MB.
1231 if (__is_processor(PV_POWER4) || __is_processor(PV_POWER4p))
1232 minsize = 8UL << 20;
1234 minsize = 4UL << 20;
1236 /* Align to the greater of the align or size */
1237 align = max(minalign, minsize);
1238 base = alloc_down(minsize, align, 1);
1240 prom_panic("ERROR, cannot find space for TCE table.\n");
1241 if (base < local_alloc_bottom)
1242 local_alloc_bottom = base;
1244 /* It seems OF doesn't null-terminate the path :-( */
1245 memset(path, 0, sizeof(path));
1246 /* Call OF to setup the TCE hardware */
1247 if (call_prom("package-to-path", 3, 1, node,
1248 path, PROM_SCRATCH_SIZE-1) == PROM_ERROR) {
1249 prom_printf("package-to-path failed\n");
1252 /* Save away the TCE table attributes for later use. */
1253 prom_setprop(node, path, "linux,tce-base", &base, sizeof(base));
1254 prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize));
1256 prom_debug("TCE table: %s\n", path);
1257 prom_debug("\tnode = 0x%x\n", node);
1258 prom_debug("\tbase = 0x%x\n", base);
1259 prom_debug("\tsize = 0x%x\n", minsize);
1261 /* Initialize the table to have a one-to-one mapping
1262 * over the allocated size.
1264 tce_entryp = (unsigned long *)base;
1265 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) {
1266 tce_entry = (i << PAGE_SHIFT);
1268 *tce_entryp = tce_entry;
1271 prom_printf("opening PHB %s", path);
1272 phb_node = call_prom("open", 1, 1, path);
1274 prom_printf("... failed\n");
1276 prom_printf("... done\n");
1278 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
1279 phb_node, -1, minsize,
1280 (u32) base, (u32) (base >> 32));
1281 call_prom("close", 1, 0, phb_node);
1284 reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);
1286 /* These are only really needed if there is a memory limit in
1287 * effect, but we don't know so export them always. */
1288 RELOC(prom_tce_alloc_start) = local_alloc_bottom;
1289 RELOC(prom_tce_alloc_end) = local_alloc_top;
1291 /* Flag the first invalid entry */
1292 prom_debug("ending prom_initialize_tce_table\n");
1297 * With CHRP SMP we need to use the OF to start the other processors.
1298 * We can't wait until smp_boot_cpus (the OF is trashed by then)
1299 * so we have to put the processors into a holding pattern controlled
1300 * by the kernel (not OF) before we destroy the OF.
1302 * This uses a chunk of low memory, puts some holding pattern
1303 * code there and sends the other processors off to there until
1304 * smp_boot_cpus tells them to do something. The holding pattern
1305 * checks that address until its cpu # is there, when it is that
1306 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care
1307 * of setting those values.
1309 * We also use physical address 0x4 here to tell when a cpu
1310 * is in its holding pattern code.
1314 extern void __secondary_hold(void);
1315 extern unsigned long __secondary_hold_spinloop;
1316 extern unsigned long __secondary_hold_acknowledge;
1319 * We want to reference the copy of __secondary_hold_* in the
1320 * 0 - 0x100 address range
1322 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff)
1324 static void __init prom_hold_cpus(void)
1331 unsigned int interrupt_server[MAX_CPU_THREADS];
1332 unsigned int cpu_threads, hw_cpu_num;
1334 struct prom_t *_prom = &RELOC(prom);
1335 unsigned long *spinloop
1336 = (void *) LOW_ADDR(__secondary_hold_spinloop);
1337 unsigned long *acknowledge
1338 = (void *) LOW_ADDR(__secondary_hold_acknowledge);
1340 /* __secondary_hold is actually a descriptor, not the text address */
1341 unsigned long secondary_hold
1342 = __pa(*PTRRELOC((unsigned long *)__secondary_hold));
1344 unsigned long secondary_hold = LOW_ADDR(__secondary_hold);
1347 prom_debug("prom_hold_cpus: start...\n");
1348 prom_debug(" 1) spinloop = 0x%x\n", (unsigned long)spinloop);
1349 prom_debug(" 1) *spinloop = 0x%x\n", *spinloop);
1350 prom_debug(" 1) acknowledge = 0x%x\n",
1351 (unsigned long)acknowledge);
1352 prom_debug(" 1) *acknowledge = 0x%x\n", *acknowledge);
1353 prom_debug(" 1) secondary_hold = 0x%x\n", secondary_hold);
1355 /* Set the common spinloop variable, so all of the secondary cpus
1356 * will block when they are awakened from their OF spinloop.
1357 * This must occur for both SMP and non SMP kernels, since OF will
1358 * be trashed when we move the kernel.
1363 for (node = 0; prom_next_node(&node); ) {
1365 prom_getprop(node, "device_type", type, sizeof(type));
1366 if (strcmp(type, RELOC("cpu")) != 0)
1369 /* Skip non-configured cpus. */
1370 if (prom_getprop(node, "status", type, sizeof(type)) > 0)
1371 if (strcmp(type, RELOC("okay")) != 0)
1375 prom_getprop(node, "reg", ®, sizeof(reg));
1377 prom_debug("\ncpuid = 0x%x\n", cpuid);
1378 prom_debug("cpu hw idx = 0x%x\n", reg);
1380 /* Init the acknowledge var which will be reset by
1381 * the secondary cpu when it awakens from its OF
1384 *acknowledge = (unsigned long)-1;
1386 propsize = prom_getprop(node, "ibm,ppc-interrupt-server#s",
1388 sizeof(interrupt_server));
1390 /* no property. old hardware has no SMT */
1392 interrupt_server[0] = reg; /* fake it with phys id */
1394 /* We have a threaded processor */
1395 cpu_threads = propsize / sizeof(u32);
1396 if (cpu_threads > MAX_CPU_THREADS) {
1397 prom_printf("SMT: too many threads!\n"
1398 "SMT: found %x, max is %x\n",
1399 cpu_threads, MAX_CPU_THREADS);
1400 cpu_threads = 1; /* ToDo: panic? */
1404 hw_cpu_num = interrupt_server[0];
1405 if (hw_cpu_num != _prom->cpu) {
1406 /* Primary Thread of non-boot cpu */
1407 prom_printf("%x : starting cpu hw idx %x... ", cpuid, reg);
1408 call_prom("start-cpu", 3, 0, node,
1409 secondary_hold, reg);
1411 for (i = 0; (i < 100000000) &&
1412 (*acknowledge == ((unsigned long)-1)); i++ )
1415 if (*acknowledge == reg)
1416 prom_printf("done\n");
1418 prom_printf("failed: %x\n", *acknowledge);
1422 prom_printf("%x : boot cpu %x\n", cpuid, reg);
1423 #endif /* CONFIG_SMP */
1425 /* Reserve cpu #s for secondary threads. They start later. */
1426 cpuid += cpu_threads;
1429 if (cpuid > NR_CPUS)
1430 prom_printf("WARNING: maximum CPUs (" __stringify(NR_CPUS)
1431 ") exceeded: ignoring extras\n");
1433 prom_debug("prom_hold_cpus: end...\n");
1437 static void __init prom_init_client_services(unsigned long pp)
1439 struct prom_t *_prom = &RELOC(prom);
1441 /* Get a handle to the prom entry point before anything else */
1442 RELOC(prom_entry) = pp;
1444 /* get a handle for the stdout device */
1445 _prom->chosen = call_prom("finddevice", 1, 1, ADDR("/chosen"));
1446 if (!PHANDLE_VALID(_prom->chosen))
1447 prom_panic("cannot find chosen"); /* msg won't be printed :( */
1449 /* get device tree root */
1450 _prom->root = call_prom("finddevice", 1, 1, ADDR("/"));
1451 if (!PHANDLE_VALID(_prom->root))
1452 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
1459 * For really old powermacs, we need to map things we claim.
1460 * For that, we need the ihandle of the mmu.
1461 * Also, on the longtrail, we need to work around other bugs.
1463 static void __init prom_find_mmu(void)
1465 struct prom_t *_prom = &RELOC(prom);
1469 oprom = call_prom("finddevice", 1, 1, ADDR("/openprom"));
1470 if (!PHANDLE_VALID(oprom))
1472 if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0)
1474 version[sizeof(version) - 1] = 0;
1475 /* XXX might need to add other versions here */
1476 if (strcmp(version, "Open Firmware, 1.0.5") == 0)
1477 of_workarounds = OF_WA_CLAIM;
1478 else if (strncmp(version, "FirmWorks,3.", 12) == 0) {
1479 of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL;
1480 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
1483 _prom->memory = call_prom("open", 1, 1, ADDR("/memory"));
1484 prom_getprop(_prom->chosen, "mmu", &_prom->mmumap,
1485 sizeof(_prom->mmumap));
1486 if (!IHANDLE_VALID(_prom->memory) || !IHANDLE_VALID(_prom->mmumap))
1487 of_workarounds &= ~OF_WA_CLAIM; /* hmmm */
1490 #define prom_find_mmu()
1493 static void __init prom_init_stdout(void)
1495 struct prom_t *_prom = &RELOC(prom);
1496 char *path = RELOC(of_stdout_device);
1500 if (prom_getprop(_prom->chosen, "stdout", &val, sizeof(val)) <= 0)
1501 prom_panic("cannot find stdout");
1503 _prom->stdout = val;
1505 /* Get the full OF pathname of the stdout device */
1506 memset(path, 0, 256);
1507 call_prom("instance-to-path", 3, 1, _prom->stdout, path, 255);
1508 val = call_prom("instance-to-package", 1, 1, _prom->stdout);
1509 prom_setprop(_prom->chosen, "/chosen", "linux,stdout-package",
1511 prom_printf("OF stdout device is: %s\n", RELOC(of_stdout_device));
1512 prom_setprop(_prom->chosen, "/chosen", "linux,stdout-path",
1513 path, strlen(path) + 1);
1515 /* If it's a display, note it */
1516 memset(type, 0, sizeof(type));
1517 prom_getprop(val, "device_type", type, sizeof(type));
1518 if (strcmp(type, RELOC("display")) == 0)
1519 prom_setprop(val, path, "linux,boot-display", NULL, 0);
1522 static void __init prom_close_stdin(void)
1524 struct prom_t *_prom = &RELOC(prom);
1527 if (prom_getprop(_prom->chosen, "stdin", &val, sizeof(val)) > 0)
1528 call_prom("close", 1, 0, val);
1531 static int __init prom_find_machine_type(void)
1533 struct prom_t *_prom = &RELOC(prom);
1541 /* Look for a PowerMac */
1542 len = prom_getprop(_prom->root, "compatible",
1543 compat, sizeof(compat)-1);
1547 char *p = &compat[i];
1551 if (strstr(p, RELOC("Power Macintosh")) ||
1552 strstr(p, RELOC("MacRISC")))
1553 return PLATFORM_POWERMAC;
1555 /* We must make sure we don't detect the IBM Cell
1556 * blades as pSeries due to some firmware issues,
1559 if (strstr(p, RELOC("IBM,CBEA")) ||
1560 strstr(p, RELOC("IBM,CPBW-1.0")))
1561 return PLATFORM_GENERIC;
1562 #endif /* CONFIG_PPC64 */
1567 /* If not a mac, try to figure out if it's an IBM pSeries or any other
1568 * PAPR compliant platform. We assume it is if :
1569 * - /device_type is "chrp" (please, do NOT use that for future
1573 len = prom_getprop(_prom->root, "device_type",
1574 compat, sizeof(compat)-1);
1576 return PLATFORM_GENERIC;
1577 if (strcmp(compat, RELOC("chrp")))
1578 return PLATFORM_GENERIC;
1580 /* Default to pSeries. We need to know if we are running LPAR */
1581 rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1582 if (!PHANDLE_VALID(rtas))
1583 return PLATFORM_GENERIC;
1584 x = prom_getproplen(rtas, "ibm,hypertas-functions");
1585 if (x != PROM_ERROR) {
1586 prom_printf("Hypertas detected, assuming LPAR !\n");
1587 return PLATFORM_PSERIES_LPAR;
1589 return PLATFORM_PSERIES;
1591 return PLATFORM_GENERIC;
1595 static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
1597 return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);
1601 * If we have a display that we don't know how to drive,
1602 * we will want to try to execute OF's open method for it
1603 * later. However, OF will probably fall over if we do that
1604 * we've taken over the MMU.
1605 * So we check whether we will need to open the display,
1606 * and if so, open it now.
1608 static void __init prom_check_displays(void)
1610 char type[16], *path;
1615 static unsigned char default_colors[] = {
1633 const unsigned char *clut;
1635 prom_printf("Looking for displays\n");
1636 for (node = 0; prom_next_node(&node); ) {
1637 memset(type, 0, sizeof(type));
1638 prom_getprop(node, "device_type", type, sizeof(type));
1639 if (strcmp(type, RELOC("display")) != 0)
1642 /* It seems OF doesn't null-terminate the path :-( */
1643 path = RELOC(prom_scratch);
1644 memset(path, 0, PROM_SCRATCH_SIZE);
1647 * leave some room at the end of the path for appending extra
1650 if (call_prom("package-to-path", 3, 1, node, path,
1651 PROM_SCRATCH_SIZE-10) == PROM_ERROR)
1653 prom_printf("found display : %s, opening ... ", path);
1655 ih = call_prom("open", 1, 1, path);
1657 prom_printf("failed\n");
1662 prom_printf("done\n");
1663 prom_setprop(node, path, "linux,opened", NULL, 0);
1665 /* Setup a usable color table when the appropriate
1666 * method is available. Should update this to set-colors */
1667 clut = RELOC(default_colors);
1668 for (i = 0; i < 32; i++, clut += 3)
1669 if (prom_set_color(ih, i, clut[0], clut[1],
1673 #ifdef CONFIG_LOGO_LINUX_CLUT224
1674 clut = PTRRELOC(RELOC(logo_linux_clut224.clut));
1675 for (i = 0; i < RELOC(logo_linux_clut224.clutsize); i++, clut += 3)
1676 if (prom_set_color(ih, i + 32, clut[0], clut[1],
1679 #endif /* CONFIG_LOGO_LINUX_CLUT224 */
1684 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */
1685 static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end,
1686 unsigned long needed, unsigned long align)
1690 *mem_start = _ALIGN(*mem_start, align);
1691 while ((*mem_start + needed) > *mem_end) {
1692 unsigned long room, chunk;
1694 prom_debug("Chunk exhausted, claiming more at %x...\n",
1695 RELOC(alloc_bottom));
1696 room = RELOC(alloc_top) - RELOC(alloc_bottom);
1697 if (room > DEVTREE_CHUNK_SIZE)
1698 room = DEVTREE_CHUNK_SIZE;
1699 if (room < PAGE_SIZE)
1700 prom_panic("No memory for flatten_device_tree (no room)");
1701 chunk = alloc_up(room, 0);
1703 prom_panic("No memory for flatten_device_tree (claim failed)");
1704 *mem_end = RELOC(alloc_top);
1707 ret = (void *)*mem_start;
1708 *mem_start += needed;
1713 #define dt_push_token(token, mem_start, mem_end) \
1714 do { *((u32 *)make_room(mem_start, mem_end, 4, 4)) = token; } while(0)
1716 static unsigned long __init dt_find_string(char *str)
1720 s = os = (char *)RELOC(dt_string_start);
1722 while (s < (char *)RELOC(dt_string_end)) {
1723 if (strcmp(s, str) == 0)
1731 * The Open Firmware 1275 specification states properties must be 31 bytes or
1732 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
1734 #define MAX_PROPERTY_NAME 64
1736 static void __init scan_dt_build_strings(phandle node,
1737 unsigned long *mem_start,
1738 unsigned long *mem_end)
1740 char *prev_name, *namep, *sstart;
1744 sstart = (char *)RELOC(dt_string_start);
1746 /* get and store all property names */
1747 prev_name = RELOC("");
1749 /* 64 is max len of name including nul. */
1750 namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1);
1751 if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) {
1752 /* No more nodes: unwind alloc */
1753 *mem_start = (unsigned long)namep;
1758 if (strcmp(namep, RELOC("name")) == 0) {
1759 *mem_start = (unsigned long)namep;
1760 prev_name = RELOC("name");
1763 /* get/create string entry */
1764 soff = dt_find_string(namep);
1766 *mem_start = (unsigned long)namep;
1767 namep = sstart + soff;
1769 /* Trim off some if we can */
1770 *mem_start = (unsigned long)namep + strlen(namep) + 1;
1771 RELOC(dt_string_end) = *mem_start;
1776 /* do all our children */
1777 child = call_prom("child", 1, 1, node);
1778 while (child != 0) {
1779 scan_dt_build_strings(child, mem_start, mem_end);
1780 child = call_prom("peer", 1, 1, child);
1784 static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
1785 unsigned long *mem_end)
1788 char *namep, *prev_name, *sstart, *p, *ep, *lp, *path;
1790 unsigned char *valp;
1791 static char pname[MAX_PROPERTY_NAME];
1794 dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);
1796 /* get the node's full name */
1797 namep = (char *)*mem_start;
1798 room = *mem_end - *mem_start;
1801 l = call_prom("package-to-path", 3, 1, node, namep, room);
1803 /* Didn't fit? Get more room. */
1805 if (l >= *mem_end - *mem_start)
1806 namep = make_room(mem_start, mem_end, l+1, 1);
1807 call_prom("package-to-path", 3, 1, node, namep, l);
1811 /* Fixup an Apple bug where they have bogus \0 chars in the
1812 * middle of the path in some properties, and extract
1813 * the unit name (everything after the last '/').
1815 for (lp = p = namep, ep = namep + l; p < ep; p++) {
1822 *mem_start = _ALIGN((unsigned long)lp + 1, 4);
1825 /* get it again for debugging */
1826 path = RELOC(prom_scratch);
1827 memset(path, 0, PROM_SCRATCH_SIZE);
1828 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
1830 /* get and store all properties */
1831 prev_name = RELOC("");
1832 sstart = (char *)RELOC(dt_string_start);
1834 if (call_prom("nextprop", 3, 1, node, prev_name,
1839 if (strcmp(RELOC(pname), RELOC("name")) == 0) {
1840 prev_name = RELOC("name");
1844 /* find string offset */
1845 soff = dt_find_string(RELOC(pname));
1847 prom_printf("WARNING: Can't find string index for"
1848 " <%s>, node %s\n", RELOC(pname), path);
1851 prev_name = sstart + soff;
1854 l = call_prom("getproplen", 2, 1, node, RELOC(pname));
1857 if (l == PROM_ERROR)
1859 if (l > MAX_PROPERTY_LENGTH) {
1860 prom_printf("WARNING: ignoring large property ");
1861 /* It seems OF doesn't null-terminate the path :-( */
1862 prom_printf("[%s] ", path);
1863 prom_printf("%s length 0x%x\n", RELOC(pname), l);
1867 /* push property head */
1868 dt_push_token(OF_DT_PROP, mem_start, mem_end);
1869 dt_push_token(l, mem_start, mem_end);
1870 dt_push_token(soff, mem_start, mem_end);
1872 /* push property content */
1873 valp = make_room(mem_start, mem_end, l, 4);
1874 call_prom("getprop", 4, 1, node, RELOC(pname), valp, l);
1875 *mem_start = _ALIGN(*mem_start, 4);
1878 /* Add a "linux,phandle" property. */
1879 soff = dt_find_string(RELOC("linux,phandle"));
1881 prom_printf("WARNING: Can't find string index for"
1882 " <linux-phandle> node %s\n", path);
1884 dt_push_token(OF_DT_PROP, mem_start, mem_end);
1885 dt_push_token(4, mem_start, mem_end);
1886 dt_push_token(soff, mem_start, mem_end);
1887 valp = make_room(mem_start, mem_end, 4, 4);
1888 *(u32 *)valp = node;
1891 /* do all our children */
1892 child = call_prom("child", 1, 1, node);
1893 while (child != 0) {
1894 scan_dt_build_struct(child, mem_start, mem_end);
1895 child = call_prom("peer", 1, 1, child);
1898 dt_push_token(OF_DT_END_NODE, mem_start, mem_end);
1901 static void __init flatten_device_tree(void)
1904 unsigned long mem_start, mem_end, room;
1905 struct boot_param_header *hdr;
1906 struct prom_t *_prom = &RELOC(prom);
1911 * Check how much room we have between alloc top & bottom (+/- a
1912 * few pages), crop to 4Mb, as this is our "chuck" size
1914 room = RELOC(alloc_top) - RELOC(alloc_bottom) - 0x4000;
1915 if (room > DEVTREE_CHUNK_SIZE)
1916 room = DEVTREE_CHUNK_SIZE;
1917 prom_debug("starting device tree allocs at %x\n", RELOC(alloc_bottom));
1919 /* Now try to claim that */
1920 mem_start = (unsigned long)alloc_up(room, PAGE_SIZE);
1922 prom_panic("Can't allocate initial device-tree chunk\n");
1923 mem_end = RELOC(alloc_top);
1925 /* Get root of tree */
1926 root = call_prom("peer", 1, 1, (phandle)0);
1927 if (root == (phandle)0)
1928 prom_panic ("couldn't get device tree root\n");
1930 /* Build header and make room for mem rsv map */
1931 mem_start = _ALIGN(mem_start, 4);
1932 hdr = make_room(&mem_start, &mem_end,
1933 sizeof(struct boot_param_header), 4);
1934 RELOC(dt_header_start) = (unsigned long)hdr;
1935 rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8);
1937 /* Start of strings */
1938 mem_start = PAGE_ALIGN(mem_start);
1939 RELOC(dt_string_start) = mem_start;
1940 mem_start += 4; /* hole */
1942 /* Add "linux,phandle" in there, we'll need it */
1943 namep = make_room(&mem_start, &mem_end, 16, 1);
1944 strcpy(namep, RELOC("linux,phandle"));
1945 mem_start = (unsigned long)namep + strlen(namep) + 1;
1947 /* Build string array */
1948 prom_printf("Building dt strings...\n");
1949 scan_dt_build_strings(root, &mem_start, &mem_end);
1950 RELOC(dt_string_end) = mem_start;
1952 /* Build structure */
1953 mem_start = PAGE_ALIGN(mem_start);
1954 RELOC(dt_struct_start) = mem_start;
1955 prom_printf("Building dt structure...\n");
1956 scan_dt_build_struct(root, &mem_start, &mem_end);
1957 dt_push_token(OF_DT_END, &mem_start, &mem_end);
1958 RELOC(dt_struct_end) = PAGE_ALIGN(mem_start);
1961 hdr->boot_cpuid_phys = _prom->cpu;
1962 hdr->magic = OF_DT_HEADER;
1963 hdr->totalsize = RELOC(dt_struct_end) - RELOC(dt_header_start);
1964 hdr->off_dt_struct = RELOC(dt_struct_start) - RELOC(dt_header_start);
1965 hdr->off_dt_strings = RELOC(dt_string_start) - RELOC(dt_header_start);
1966 hdr->dt_strings_size = RELOC(dt_string_end) - RELOC(dt_string_start);
1967 hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - RELOC(dt_header_start);
1968 hdr->version = OF_DT_VERSION;
1969 /* Version 16 is not backward compatible */
1970 hdr->last_comp_version = 0x10;
1972 /* Copy the reserve map in */
1973 memcpy(rsvmap, RELOC(mem_reserve_map), sizeof(mem_reserve_map));
1978 prom_printf("reserved memory map:\n");
1979 for (i = 0; i < RELOC(mem_reserve_cnt); i++)
1980 prom_printf(" %x - %x\n",
1981 RELOC(mem_reserve_map)[i].base,
1982 RELOC(mem_reserve_map)[i].size);
1985 /* Bump mem_reserve_cnt to cause further reservations to fail
1986 * since it's too late.
1988 RELOC(mem_reserve_cnt) = MEM_RESERVE_MAP_SIZE;
1990 prom_printf("Device tree strings 0x%x -> 0x%x\n",
1991 RELOC(dt_string_start), RELOC(dt_string_end));
1992 prom_printf("Device tree struct 0x%x -> 0x%x\n",
1993 RELOC(dt_struct_start), RELOC(dt_struct_end));
1997 #ifdef CONFIG_PPC_MAPLE
1998 /* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property.
1999 * The values are bad, and it doesn't even have the right number of cells. */
2000 static void __init fixup_device_tree_maple(void)
2003 u32 rloc = 0x01002000; /* IO space; PCI device = 4 */
2007 name = "/ht@0/isa@4";
2008 isa = call_prom("finddevice", 1, 1, ADDR(name));
2009 if (!PHANDLE_VALID(isa)) {
2010 name = "/ht@0/isa@6";
2011 isa = call_prom("finddevice", 1, 1, ADDR(name));
2012 rloc = 0x01003000; /* IO space; PCI device = 6 */
2014 if (!PHANDLE_VALID(isa))
2017 if (prom_getproplen(isa, "ranges") != 12)
2019 if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges))
2023 if (isa_ranges[0] != 0x1 ||
2024 isa_ranges[1] != 0xf4000000 ||
2025 isa_ranges[2] != 0x00010000)
2028 prom_printf("Fixing up bogus ISA range on Maple/Apache...\n");
2030 isa_ranges[0] = 0x1;
2031 isa_ranges[1] = 0x0;
2032 isa_ranges[2] = rloc;
2033 isa_ranges[3] = 0x0;
2034 isa_ranges[4] = 0x0;
2035 isa_ranges[5] = 0x00010000;
2036 prom_setprop(isa, name, "ranges",
2037 isa_ranges, sizeof(isa_ranges));
2040 #define fixup_device_tree_maple()
2043 #ifdef CONFIG_PPC_CHRP
2045 * Pegasos and BriQ lacks the "ranges" property in the isa node
2046 * Pegasos needs decimal IRQ 14/15, not hexadecimal
2048 static void __init fixup_device_tree_chrp(void)
2052 u32 rloc = 0x01006000; /* IO space; PCI device = 12 */
2056 name = "/pci@80000000/isa@c";
2057 ph = call_prom("finddevice", 1, 1, ADDR(name));
2058 if (!PHANDLE_VALID(ph)) {
2059 name = "/pci@ff500000/isa@6";
2060 ph = call_prom("finddevice", 1, 1, ADDR(name));
2061 rloc = 0x01003000; /* IO space; PCI device = 6 */
2063 if (PHANDLE_VALID(ph)) {
2064 rc = prom_getproplen(ph, "ranges");
2065 if (rc == 0 || rc == PROM_ERROR) {
2066 prom_printf("Fixing up missing ISA range on Pegasos...\n");
2073 prop[5] = 0x00010000;
2074 prom_setprop(ph, name, "ranges", prop, sizeof(prop));
2078 name = "/pci@80000000/ide@C,1";
2079 ph = call_prom("finddevice", 1, 1, ADDR(name));
2080 if (PHANDLE_VALID(ph)) {
2081 prom_printf("Fixing up IDE interrupt on Pegasos...\n");
2086 prom_setprop(ph, name, "interrupts", prop, 4*sizeof(u32));
2090 #define fixup_device_tree_chrp()
2093 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
2094 static void __init fixup_device_tree_pmac(void)
2096 phandle u3, i2c, mpic;
2101 /* Some G5s have a missing interrupt definition, fix it up here */
2102 u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
2103 if (!PHANDLE_VALID(u3))
2105 i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
2106 if (!PHANDLE_VALID(i2c))
2108 mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
2109 if (!PHANDLE_VALID(mpic))
2112 /* check if proper rev of u3 */
2113 if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev))
2116 if (u3_rev < 0x35 || u3_rev > 0x39)
2118 /* does it need fixup ? */
2119 if (prom_getproplen(i2c, "interrupts") > 0)
2122 prom_printf("fixing up bogus interrupts for u3 i2c...\n");
2124 /* interrupt on this revision of u3 is number 0 and level */
2127 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts",
2128 &interrupts, sizeof(interrupts));
2130 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
2131 &parent, sizeof(parent));
2134 #define fixup_device_tree_pmac()
2137 #ifdef CONFIG_PPC_EFIKA
2138 /* The current fw of the Efika has a device tree needs quite a few
2139 * fixups to be compliant with the mpc52xx bindings. It's currently
2140 * unknown if it will ever be compliant (come on bPlan ...) so we do fixups.
2141 * NOTE that we (barely) tolerate it because the EFIKA was out before
2142 * the bindings were finished, for any new boards -> RTFM ! */
2144 struct subst_entry {
2151 static void __init fixup_device_tree_efika(void)
2153 /* Substitution table */
2154 #define prop_cstr(x) x, sizeof(x)
2155 int prop_sound_irq[3] = { 2, 2, 0 };
2156 int prop_bcomm_irq[3*16] = { 3,0,0, 3,1,0, 3,2,0, 3,3,0,
2157 3,4,0, 3,5,0, 3,6,0, 3,7,0,
2158 3,8,0, 3,9,0, 3,10,0, 3,11,0,
2159 3,12,0, 3,13,0, 3,14,0, 3,15,0 };
2160 struct subst_entry efika_subst_table[] = {
2161 { "/", "device_type", prop_cstr("efika") },
2162 { "/builtin", "device_type", prop_cstr("soc") },
2163 { "/builtin/ata", "compatible", prop_cstr("mpc5200b-ata\0mpc5200-ata"), },
2164 { "/builtin/bestcomm", "compatible", prop_cstr("mpc5200b-bestcomm\0mpc5200-bestcomm") },
2165 { "/builtin/bestcomm", "interrupts", prop_bcomm_irq, sizeof(prop_bcomm_irq) },
2166 { "/builtin/ethernet", "compatible", prop_cstr("mpc5200b-fec\0mpc5200-fec") },
2167 { "/builtin/pic", "compatible", prop_cstr("mpc5200b-pic\0mpc5200-pic") },
2168 { "/builtin/serial", "compatible", prop_cstr("mpc5200b-psc-uart\0mpc5200-psc-uart") },
2169 { "/builtin/sound", "compatible", prop_cstr("mpc5200b-psc-ac97\0mpc5200-psc-ac97") },
2170 { "/builtin/sound", "interrupts", prop_sound_irq, sizeof(prop_sound_irq) },
2171 { "/builtin/sram", "compatible", prop_cstr("mpc5200b-sram\0mpc5200-sram") },
2172 { "/builtin/sram", "device_type", prop_cstr("sram") },
2182 /* Check if we're really running on a EFIKA */
2183 node = call_prom("finddevice", 1, 1, ADDR("/"));
2184 if (!PHANDLE_VALID(node))
2187 rv = prom_getprop(node, "model", prop, sizeof(prop));
2188 if (rv == PROM_ERROR)
2190 if (strcmp(prop, "EFIKA5K2"))
2193 prom_printf("Applying EFIKA device tree fixups\n");
2195 /* Process substitution table */
2196 for (i=0; efika_subst_table[i].path; i++) {
2197 struct subst_entry *se = &efika_subst_table[i];
2199 node = call_prom("finddevice", 1, 1, ADDR(se->path));
2200 if (!PHANDLE_VALID(node)) {
2201 prom_printf("fixup_device_tree_efika: ",
2202 "skipped entry %x - not found\n", i);
2206 rv = prom_setprop(node, se->path, se->property,
2207 se->value, se->value_len );
2208 if (rv == PROM_ERROR)
2209 prom_printf("fixup_device_tree_efika: ",
2210 "skipped entry %x - setprop error\n", i);
2214 #define fixup_device_tree_efika()
2217 static void __init fixup_device_tree(void)
2219 fixup_device_tree_maple();
2220 fixup_device_tree_chrp();
2221 fixup_device_tree_pmac();
2222 fixup_device_tree_efika();
2225 static void __init prom_find_boot_cpu(void)
2227 struct prom_t *_prom = &RELOC(prom);
2233 if (prom_getprop(_prom->chosen, "cpu", &prom_cpu, sizeof(prom_cpu)) <= 0)
2236 cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);
2238 prom_getprop(cpu_pkg, "reg", &getprop_rval, sizeof(getprop_rval));
2239 _prom->cpu = getprop_rval;
2241 prom_debug("Booting CPU hw index = 0x%x\n", _prom->cpu);
2244 static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
2246 #ifdef CONFIG_BLK_DEV_INITRD
2247 struct prom_t *_prom = &RELOC(prom);
2249 if (r3 && r4 && r4 != 0xdeadbeef) {
2252 RELOC(prom_initrd_start) = is_kernel_addr(r3) ? __pa(r3) : r3;
2253 RELOC(prom_initrd_end) = RELOC(prom_initrd_start) + r4;
2255 val = RELOC(prom_initrd_start);
2256 prom_setprop(_prom->chosen, "/chosen", "linux,initrd-start",
2258 val = RELOC(prom_initrd_end);
2259 prom_setprop(_prom->chosen, "/chosen", "linux,initrd-end",
2262 reserve_mem(RELOC(prom_initrd_start),
2263 RELOC(prom_initrd_end) - RELOC(prom_initrd_start));
2265 prom_debug("initrd_start=0x%x\n", RELOC(prom_initrd_start));
2266 prom_debug("initrd_end=0x%x\n", RELOC(prom_initrd_end));
2268 #endif /* CONFIG_BLK_DEV_INITRD */
2272 * We enter here early on, when the Open Firmware prom is still
2273 * handling exceptions and the MMU hash table for us.
2276 unsigned long __init prom_init(unsigned long r3, unsigned long r4,
2278 unsigned long r6, unsigned long r7)
2280 struct prom_t *_prom;
2282 unsigned long offset = reloc_offset();
2288 _prom = &RELOC(prom);
2291 * First zero the BSS
2293 memset(&RELOC(__bss_start), 0, __bss_stop - __bss_start);
2296 * Init interface to Open Firmware, get some node references,
2299 prom_init_client_services(pp);
2302 * See if this OF is old enough that we need to do explicit maps
2303 * and other workarounds
2308 * Init prom stdout device
2313 * Get default machine type. At this point, we do not differentiate
2314 * between pSeries SMP and pSeries LPAR
2316 RELOC(of_platform) = prom_find_machine_type();
2318 /* Bail if this is a kdump kernel. */
2319 if (PHYSICAL_START > 0)
2320 prom_panic("Error: You can't boot a kdump kernel from OF!\n");
2323 * Check for an initrd
2325 prom_check_initrd(r3, r4);
2327 #ifdef CONFIG_PPC_PSERIES
2329 * On pSeries, inform the firmware about our capabilities
2331 if (RELOC(of_platform) == PLATFORM_PSERIES ||
2332 RELOC(of_platform) == PLATFORM_PSERIES_LPAR)
2333 prom_send_capabilities();
2337 * Copy the CPU hold code
2339 if (RELOC(of_platform) != PLATFORM_POWERMAC)
2340 copy_and_flush(0, KERNELBASE + offset, 0x100, 0);
2343 * Do early parsing of command line
2345 early_cmdline_parse();
2348 * Initialize memory management within prom_init
2353 * Determine which cpu is actually running right _now_
2355 prom_find_boot_cpu();
2358 * Initialize display devices
2360 prom_check_displays();
2364 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
2365 * that uses the allocator, we need to make sure we get the top of memory
2366 * available for us here...
2368 if (RELOC(of_platform) == PLATFORM_PSERIES)
2369 prom_initialize_tce_table();
2373 * On non-powermacs, try to instantiate RTAS and puts all CPUs
2374 * in spin-loops. PowerMacs don't have a working RTAS and use
2375 * a different way to spin CPUs
2377 if (RELOC(of_platform) != PLATFORM_POWERMAC) {
2378 prom_instantiate_rtas();
2383 * Fill in some infos for use by the kernel later on
2386 if (RELOC(prom_iommu_off))
2387 prom_setprop(_prom->chosen, "/chosen", "linux,iommu-off",
2390 if (RELOC(prom_iommu_force_on))
2391 prom_setprop(_prom->chosen, "/chosen", "linux,iommu-force-on",
2394 if (RELOC(prom_tce_alloc_start)) {
2395 prom_setprop(_prom->chosen, "/chosen", "linux,tce-alloc-start",
2396 &RELOC(prom_tce_alloc_start),
2397 sizeof(prom_tce_alloc_start));
2398 prom_setprop(_prom->chosen, "/chosen", "linux,tce-alloc-end",
2399 &RELOC(prom_tce_alloc_end),
2400 sizeof(prom_tce_alloc_end));
2405 * Fixup any known bugs in the device-tree
2407 fixup_device_tree();
2410 * Now finally create the flattened device-tree
2412 prom_printf("copying OF device tree ...\n");
2413 flatten_device_tree();
2416 * in case stdin is USB and still active on IBM machines...
2417 * Unfortunately quiesce crashes on some powermacs if we have
2418 * closed stdin already (in particular the powerbook 101).
2420 if (RELOC(of_platform) != PLATFORM_POWERMAC)
2424 * Call OF "quiesce" method to shut down pending DMA's from
2427 prom_printf("Calling quiesce ...\n");
2428 call_prom("quiesce", 0, 0);
2431 * And finally, call the kernel passing it the flattened device
2432 * tree and NULL as r5, thus triggering the new entry point which
2433 * is common to us and kexec
2435 hdr = RELOC(dt_header_start);
2436 prom_printf("returning from prom_init\n");
2437 prom_debug("->dt_header_start=0x%x\n", hdr);
2440 reloc_got2(-offset);
2443 __start(hdr, KERNELBASE + offset, 0);