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/config.h>
20 #include <linux/kernel.h>
21 #include <linux/string.h>
22 #include <linux/init.h>
23 #include <linux/threads.h>
24 #include <linux/spinlock.h>
25 #include <linux/types.h>
26 #include <linux/pci.h>
27 #include <linux/proc_fs.h>
28 #include <linux/stringify.h>
29 #include <linux/delay.h>
30 #include <linux/initrd.h>
31 #include <linux/bitops.h>
35 #include <asm/processor.h>
39 #include <asm/system.h>
41 #include <asm/pgtable.h>
43 #include <asm/iommu.h>
44 #include <asm/btext.h>
45 #include <asm/sections.h>
46 #include <asm/machdep.h>
48 #ifdef CONFIG_LOGO_LINUX_CLUT224
49 #include <linux/linux_logo.h>
50 extern const struct linux_logo logo_linux_clut224
;
54 * Properties whose value is longer than this get excluded from our
55 * copy of the device tree. This value does need to be big enough to
56 * ensure that we don't lose things like the interrupt-map property
57 * on a PCI-PCI bridge.
59 #define MAX_PROPERTY_LENGTH (1UL * 1024 * 1024)
62 * Eventually bump that one up
64 #define DEVTREE_CHUNK_SIZE 0x100000
67 * This is the size of the local memory reserve map that gets copied
68 * into the boot params passed to the kernel. That size is totally
69 * flexible as the kernel just reads the list until it encounters an
70 * entry with size 0, so it can be changed without breaking binary
73 #define MEM_RESERVE_MAP_SIZE 8
76 * prom_init() is called very early on, before the kernel text
77 * and data have been mapped to KERNELBASE. At this point the code
78 * is running at whatever address it has been loaded at.
79 * On ppc32 we compile with -mrelocatable, which means that references
80 * to extern and static variables get relocated automatically.
81 * On ppc64 we have to relocate the references explicitly with
82 * RELOC. (Note that strings count as static variables.)
84 * Because OF may have mapped I/O devices into the area starting at
85 * KERNELBASE, particularly on CHRP machines, we can't safely call
86 * OF once the kernel has been mapped to KERNELBASE. Therefore all
87 * OF calls must be done within prom_init().
89 * ADDR is used in calls to call_prom. The 4th and following
90 * arguments to call_prom should be 32-bit values.
91 * On ppc64, 64 bit values are truncated to 32 bits (and
92 * fortunately don't get interpreted as two arguments).
95 #define RELOC(x) (*PTRRELOC(&(x)))
96 #define ADDR(x) (u32) add_reloc_offset((unsigned long)(x))
97 #define OF_WORKAROUNDS 0
100 #define ADDR(x) (u32) (x)
101 #define OF_WORKAROUNDS of_workarounds
105 #define OF_WA_CLAIM 1 /* do phys/virt claim separately, then map */
106 #define OF_WA_LONGTRAIL 2 /* work around longtrail bugs */
108 #define PROM_BUG() do { \
109 prom_printf("kernel BUG at %s line 0x%x!\n", \
110 RELOC(__FILE__), __LINE__); \
111 __asm__ __volatile__(".long " BUG_ILLEGAL_INSTR); \
115 #define prom_debug(x...) prom_printf(x)
117 #define prom_debug(x...)
121 typedef u32 prom_arg_t
;
139 struct mem_map_entry
{
146 extern void __start(unsigned long r3
, unsigned long r4
, unsigned long r5
);
149 extern int enter_prom(struct prom_args
*args
, unsigned long entry
);
151 static inline int enter_prom(struct prom_args
*args
, unsigned long entry
)
153 return ((int (*)(struct prom_args
*))entry
)(args
);
157 extern void copy_and_flush(unsigned long dest
, unsigned long src
,
158 unsigned long size
, unsigned long offset
);
161 static struct prom_t __initdata prom
;
163 static unsigned long prom_entry __initdata
;
165 #define PROM_SCRATCH_SIZE 256
167 static char __initdata of_stdout_device
[256];
168 static char __initdata prom_scratch
[PROM_SCRATCH_SIZE
];
170 static unsigned long __initdata dt_header_start
;
171 static unsigned long __initdata dt_struct_start
, dt_struct_end
;
172 static unsigned long __initdata dt_string_start
, dt_string_end
;
174 static unsigned long __initdata prom_initrd_start
, prom_initrd_end
;
177 static int __initdata iommu_force_on
;
178 static int __initdata ppc64_iommu_off
;
179 static unsigned long __initdata prom_tce_alloc_start
;
180 static unsigned long __initdata prom_tce_alloc_end
;
183 static int __initdata of_platform
;
185 static char __initdata prom_cmd_line
[COMMAND_LINE_SIZE
];
187 static unsigned long __initdata prom_memory_limit
;
189 static unsigned long __initdata alloc_top
;
190 static unsigned long __initdata alloc_top_high
;
191 static unsigned long __initdata alloc_bottom
;
192 static unsigned long __initdata rmo_top
;
193 static unsigned long __initdata ram_top
;
196 static unsigned long __initdata prom_crashk_base
;
197 static unsigned long __initdata prom_crashk_size
;
200 static struct mem_map_entry __initdata mem_reserve_map
[MEM_RESERVE_MAP_SIZE
];
201 static int __initdata mem_reserve_cnt
;
203 static cell_t __initdata regbuf
[1024];
206 #define MAX_CPU_THREADS 2
212 unsigned int threadid
;
213 } hmt_thread_data
[NR_CPUS
];
214 #endif /* CONFIG_HMT */
217 * Error results ... some OF calls will return "-1" on error, some
218 * will return 0, some will return either. To simplify, here are
219 * macros to use with any ihandle or phandle return value to check if
223 #define PROM_ERROR (-1u)
224 #define PHANDLE_VALID(p) ((p) != 0 && (p) != PROM_ERROR)
225 #define IHANDLE_VALID(i) ((i) != 0 && (i) != PROM_ERROR)
228 /* This is the one and *ONLY* place where we actually call open
232 static int __init
call_prom(const char *service
, int nargs
, int nret
, ...)
235 struct prom_args args
;
238 args
.service
= ADDR(service
);
242 va_start(list
, nret
);
243 for (i
= 0; i
< nargs
; i
++)
244 args
.args
[i
] = va_arg(list
, prom_arg_t
);
247 for (i
= 0; i
< nret
; i
++)
248 args
.args
[nargs
+i
] = 0;
250 if (enter_prom(&args
, RELOC(prom_entry
)) < 0)
253 return (nret
> 0) ? args
.args
[nargs
] : 0;
256 static int __init
call_prom_ret(const char *service
, int nargs
, int nret
,
257 prom_arg_t
*rets
, ...)
260 struct prom_args args
;
263 args
.service
= ADDR(service
);
267 va_start(list
, rets
);
268 for (i
= 0; i
< nargs
; i
++)
269 args
.args
[i
] = va_arg(list
, prom_arg_t
);
272 for (i
= 0; i
< nret
; i
++)
273 args
.args
[nargs
+i
] = 0;
275 if (enter_prom(&args
, RELOC(prom_entry
)) < 0)
279 for (i
= 1; i
< nret
; ++i
)
280 rets
[i
-1] = args
.args
[nargs
+i
];
282 return (nret
> 0) ? args
.args
[nargs
] : 0;
286 static void __init
prom_print(const char *msg
)
289 struct prom_t
*_prom
= &RELOC(prom
);
291 if (_prom
->stdout
== 0)
294 for (p
= msg
; *p
!= 0; p
= q
) {
295 for (q
= p
; *q
!= 0 && *q
!= '\n'; ++q
)
298 call_prom("write", 3, 1, _prom
->stdout
, p
, q
- p
);
302 call_prom("write", 3, 1, _prom
->stdout
, ADDR("\r\n"), 2);
307 static void __init
prom_print_hex(unsigned long val
)
309 int i
, nibbles
= sizeof(val
)*2;
310 char buf
[sizeof(val
)*2+1];
311 struct prom_t
*_prom
= &RELOC(prom
);
313 for (i
= nibbles
-1; i
>= 0; i
--) {
314 buf
[i
] = (val
& 0xf) + '0';
316 buf
[i
] += ('a'-'0'-10);
320 call_prom("write", 3, 1, _prom
->stdout
, buf
, nibbles
);
324 static void __init
prom_printf(const char *format
, ...)
326 const char *p
, *q
, *s
;
329 struct prom_t
*_prom
= &RELOC(prom
);
331 va_start(args
, format
);
333 format
= PTRRELOC(format
);
335 for (p
= format
; *p
!= 0; p
= q
) {
336 for (q
= p
; *q
!= 0 && *q
!= '\n' && *q
!= '%'; ++q
)
339 call_prom("write", 3, 1, _prom
->stdout
, p
, q
- p
);
344 call_prom("write", 3, 1, _prom
->stdout
,
354 s
= va_arg(args
, const char *);
359 v
= va_arg(args
, unsigned long);
367 static unsigned int __init
prom_claim(unsigned long virt
, unsigned long size
,
370 struct prom_t
*_prom
= &RELOC(prom
);
372 if (align
== 0 && (OF_WORKAROUNDS
& OF_WA_CLAIM
)) {
374 * Old OF requires we claim physical and virtual separately
375 * and then map explicitly (assuming virtual mode)
380 ret
= call_prom_ret("call-method", 5, 2, &result
,
381 ADDR("claim"), _prom
->memory
,
383 if (ret
!= 0 || result
== -1)
385 ret
= call_prom_ret("call-method", 5, 2, &result
,
386 ADDR("claim"), _prom
->mmumap
,
389 call_prom("call-method", 4, 1, ADDR("release"),
390 _prom
->memory
, size
, virt
);
393 /* the 0x12 is M (coherence) + PP == read/write */
394 call_prom("call-method", 6, 1,
395 ADDR("map"), _prom
->mmumap
, 0x12, size
, virt
, virt
);
398 return call_prom("claim", 3, 1, (prom_arg_t
)virt
, (prom_arg_t
)size
,
402 static void __init
__attribute__((noreturn
)) prom_panic(const char *reason
)
405 reason
= PTRRELOC(reason
);
408 /* ToDo: should put up an SRC here on p/iSeries */
409 call_prom("exit", 0, 0);
411 for (;;) /* should never get here */
416 static int __init
prom_next_node(phandle
*nodep
)
420 if ((node
= *nodep
) != 0
421 && (*nodep
= call_prom("child", 1, 1, node
)) != 0)
423 if ((*nodep
= call_prom("peer", 1, 1, node
)) != 0)
426 if ((node
= call_prom("parent", 1, 1, node
)) == 0)
428 if ((*nodep
= call_prom("peer", 1, 1, node
)) != 0)
433 static int inline prom_getprop(phandle node
, const char *pname
,
434 void *value
, size_t valuelen
)
436 return call_prom("getprop", 4, 1, node
, ADDR(pname
),
437 (u32
)(unsigned long) value
, (u32
) valuelen
);
440 static int inline prom_getproplen(phandle node
, const char *pname
)
442 return call_prom("getproplen", 2, 1, node
, ADDR(pname
));
445 static void add_string(char **str
, const char *q
)
455 static char *tohex(unsigned int x
)
457 static char digits
[] = "0123456789abcdef";
458 static char result
[9];
465 result
[i
] = digits
[x
& 0xf];
467 } while (x
!= 0 && i
> 0);
471 static int __init
prom_setprop(phandle node
, const char *nodename
,
472 const char *pname
, void *value
, size_t valuelen
)
476 if (!(OF_WORKAROUNDS
& OF_WA_LONGTRAIL
))
477 return call_prom("setprop", 4, 1, node
, ADDR(pname
),
478 (u32
)(unsigned long) value
, (u32
) valuelen
);
480 /* gah... setprop doesn't work on longtrail, have to use interpret */
482 add_string(&p
, "dev");
483 add_string(&p
, nodename
);
484 add_string(&p
, tohex((u32
)(unsigned long) value
));
485 add_string(&p
, tohex(valuelen
));
486 add_string(&p
, tohex(ADDR(pname
)));
487 add_string(&p
, tohex(strlen(RELOC(pname
))));
488 add_string(&p
, "property");
490 return call_prom("interpret", 1, 1, (u32
)(unsigned long) cmd
);
493 /* We can't use the standard versions because of RELOC headaches. */
494 #define isxdigit(c) (('0' <= (c) && (c) <= '9') \
495 || ('a' <= (c) && (c) <= 'f') \
496 || ('A' <= (c) && (c) <= 'F'))
498 #define isdigit(c) ('0' <= (c) && (c) <= '9')
499 #define islower(c) ('a' <= (c) && (c) <= 'z')
500 #define toupper(c) (islower(c) ? ((c) - 'a' + 'A') : (c))
502 unsigned long prom_strtoul(const char *cp
, const char **endp
)
504 unsigned long result
= 0, base
= 10, value
;
509 if (toupper(*cp
) == 'X') {
515 while (isxdigit(*cp
) &&
516 (value
= isdigit(*cp
) ? *cp
- '0' : toupper(*cp
) - 'A' + 10) < base
) {
517 result
= result
* base
+ value
;
527 unsigned long prom_memparse(const char *ptr
, const char **retptr
)
529 unsigned long ret
= prom_strtoul(ptr
, retptr
);
533 * We can't use a switch here because GCC *may* generate a
534 * jump table which won't work, because we're not running at
535 * the address we're linked at.
537 if ('G' == **retptr
|| 'g' == **retptr
)
540 if ('M' == **retptr
|| 'm' == **retptr
)
543 if ('K' == **retptr
|| 'k' == **retptr
)
555 * Early parsing of the command line passed to the kernel, used for
556 * "mem=x" and the options that affect the iommu
558 static void __init
early_cmdline_parse(void)
560 struct prom_t
*_prom
= &RELOC(prom
);
565 RELOC(prom_cmd_line
[0]) = 0;
566 p
= RELOC(prom_cmd_line
);
567 if ((long)_prom
->chosen
> 0)
568 l
= prom_getprop(_prom
->chosen
, "bootargs", p
, COMMAND_LINE_SIZE
-1);
569 #ifdef CONFIG_CMDLINE
570 if (l
== 0) /* dbl check */
571 strlcpy(RELOC(prom_cmd_line
),
572 RELOC(CONFIG_CMDLINE
), sizeof(prom_cmd_line
));
573 #endif /* CONFIG_CMDLINE */
574 prom_printf("command line: %s\n", RELOC(prom_cmd_line
));
577 opt
= strstr(RELOC(prom_cmd_line
), RELOC("iommu="));
579 prom_printf("iommu opt is: %s\n", opt
);
581 while (*opt
&& *opt
== ' ')
583 if (!strncmp(opt
, RELOC("off"), 3))
584 RELOC(ppc64_iommu_off
) = 1;
585 else if (!strncmp(opt
, RELOC("force"), 5))
586 RELOC(iommu_force_on
) = 1;
590 opt
= strstr(RELOC(prom_cmd_line
), RELOC("mem="));
593 RELOC(prom_memory_limit
) = prom_memparse(opt
, (const char **)&opt
);
595 /* Align to 16 MB == size of ppc64 large page */
596 RELOC(prom_memory_limit
) = ALIGN(RELOC(prom_memory_limit
), 0x1000000);
602 * crashkernel=size@addr specifies the location to reserve for
605 opt
= strstr(RELOC(prom_cmd_line
), RELOC("crashkernel="));
608 RELOC(prom_crashk_size
) =
609 prom_memparse(opt
, (const char **)&opt
);
611 if (ALIGN(RELOC(prom_crashk_size
), 0x1000000) !=
612 RELOC(prom_crashk_size
)) {
613 prom_printf("Warning: crashkernel size is not "
614 "aligned to 16MB\n");
618 * At present, the crash kernel always run at 32MB.
619 * Just ignore whatever user passed.
621 RELOC(prom_crashk_base
) = 0x2000000;
623 prom_printf("Warning: PPC64 kdump kernel always runs "
630 #ifdef CONFIG_PPC_PSERIES
632 * To tell the firmware what our capabilities are, we have to pass
633 * it a fake 32-bit ELF header containing a couple of PT_NOTE sections
634 * that contain structures that contain the actual values.
636 static struct fake_elf
{
643 char name
[8]; /* "PowerPC" */
657 char name
[24]; /* "IBM,RPA-Client-Config" */
671 .e_ident
= { 0x7f, 'E', 'L', 'F',
672 ELFCLASS32
, ELFDATA2MSB
, EV_CURRENT
},
673 .e_type
= ET_EXEC
, /* yeah right */
675 .e_version
= EV_CURRENT
,
676 .e_phoff
= offsetof(struct fake_elf
, phdr
),
677 .e_phentsize
= sizeof(Elf32_Phdr
),
683 .p_offset
= offsetof(struct fake_elf
, chrpnote
),
684 .p_filesz
= sizeof(struct chrpnote
)
687 .p_offset
= offsetof(struct fake_elf
, rpanote
),
688 .p_filesz
= sizeof(struct rpanote
)
692 .namesz
= sizeof("PowerPC"),
693 .descsz
= sizeof(struct chrpdesc
),
697 .real_mode
= ~0U, /* ~0 means "don't care" */
706 .namesz
= sizeof("IBM,RPA-Client-Config"),
707 .descsz
= sizeof(struct rpadesc
),
709 .name
= "IBM,RPA-Client-Config",
712 .min_rmo_size
= 64, /* in megabytes */
713 .min_rmo_percent
= 0,
714 .max_pft_size
= 48, /* 2^48 bytes max PFT size */
722 static void __init
prom_send_capabilities(void)
726 elfloader
= call_prom("open", 1, 1, ADDR("/packages/elf-loader"));
727 if (elfloader
== 0) {
728 prom_printf("couldn't open /packages/elf-loader\n");
731 call_prom("call-method", 3, 1, ADDR("process-elf-header"),
732 elfloader
, ADDR(&fake_elf
));
733 call_prom("close", 1, 0, elfloader
);
738 * Memory allocation strategy... our layout is normally:
740 * at 14Mb or more we have vmlinux, then a gap and initrd. In some
741 * rare cases, initrd might end up being before the kernel though.
742 * We assume this won't override the final kernel at 0, we have no
743 * provision to handle that in this version, but it should hopefully
746 * alloc_top is set to the top of RMO, eventually shrink down if the
749 * alloc_bottom is set to the top of kernel/initrd
751 * from there, allocations are done this way : rtas is allocated
752 * topmost, and the device-tree is allocated from the bottom. We try
753 * to grow the device-tree allocation as we progress. If we can't,
754 * then we fail, we don't currently have a facility to restart
755 * elsewhere, but that shouldn't be necessary.
757 * Note that calls to reserve_mem have to be done explicitly, memory
758 * allocated with either alloc_up or alloc_down isn't automatically
764 * Allocates memory in the RMO upward from the kernel/initrd
766 * When align is 0, this is a special case, it means to allocate in place
767 * at the current location of alloc_bottom or fail (that is basically
768 * extending the previous allocation). Used for the device-tree flattening
770 static unsigned long __init
alloc_up(unsigned long size
, unsigned long align
)
772 unsigned long base
= RELOC(alloc_bottom
);
773 unsigned long addr
= 0;
776 base
= _ALIGN_UP(base
, align
);
777 prom_debug("alloc_up(%x, %x)\n", size
, align
);
778 if (RELOC(ram_top
) == 0)
779 prom_panic("alloc_up() called with mem not initialized\n");
782 base
= _ALIGN_UP(RELOC(alloc_bottom
), align
);
784 base
= RELOC(alloc_bottom
);
786 for(; (base
+ size
) <= RELOC(alloc_top
);
787 base
= _ALIGN_UP(base
+ 0x100000, align
)) {
788 prom_debug(" trying: 0x%x\n\r", base
);
789 addr
= (unsigned long)prom_claim(base
, size
, 0);
790 if (addr
!= PROM_ERROR
&& addr
!= 0)
798 RELOC(alloc_bottom
) = addr
;
800 prom_debug(" -> %x\n", addr
);
801 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom
));
802 prom_debug(" alloc_top : %x\n", RELOC(alloc_top
));
803 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high
));
804 prom_debug(" rmo_top : %x\n", RELOC(rmo_top
));
805 prom_debug(" ram_top : %x\n", RELOC(ram_top
));
811 * Allocates memory downward, either from top of RMO, or if highmem
812 * is set, from the top of RAM. Note that this one doesn't handle
813 * failures. It does claim memory if highmem is not set.
815 static unsigned long __init
alloc_down(unsigned long size
, unsigned long align
,
818 unsigned long base
, addr
= 0;
820 prom_debug("alloc_down(%x, %x, %s)\n", size
, align
,
821 highmem
? RELOC("(high)") : RELOC("(low)"));
822 if (RELOC(ram_top
) == 0)
823 prom_panic("alloc_down() called with mem not initialized\n");
826 /* Carve out storage for the TCE table. */
827 addr
= _ALIGN_DOWN(RELOC(alloc_top_high
) - size
, align
);
828 if (addr
<= RELOC(alloc_bottom
))
830 /* Will we bump into the RMO ? If yes, check out that we
831 * didn't overlap existing allocations there, if we did,
832 * we are dead, we must be the first in town !
834 if (addr
< RELOC(rmo_top
)) {
835 /* Good, we are first */
836 if (RELOC(alloc_top
) == RELOC(rmo_top
))
837 RELOC(alloc_top
) = RELOC(rmo_top
) = addr
;
841 RELOC(alloc_top_high
) = addr
;
845 base
= _ALIGN_DOWN(RELOC(alloc_top
) - size
, align
);
846 for (; base
> RELOC(alloc_bottom
);
847 base
= _ALIGN_DOWN(base
- 0x100000, align
)) {
848 prom_debug(" trying: 0x%x\n\r", base
);
849 addr
= (unsigned long)prom_claim(base
, size
, 0);
850 if (addr
!= PROM_ERROR
&& addr
!= 0)
856 RELOC(alloc_top
) = addr
;
859 prom_debug(" -> %x\n", addr
);
860 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom
));
861 prom_debug(" alloc_top : %x\n", RELOC(alloc_top
));
862 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high
));
863 prom_debug(" rmo_top : %x\n", RELOC(rmo_top
));
864 prom_debug(" ram_top : %x\n", RELOC(ram_top
));
872 static unsigned long __init
prom_next_cell(int s
, cell_t
**cellp
)
877 /* Ignore more than 2 cells */
878 while (s
> sizeof(unsigned long) / 4) {
894 * Very dumb function for adding to the memory reserve list, but
895 * we don't need anything smarter at this point
897 * XXX Eventually check for collisions. They should NEVER happen.
898 * If problems seem to show up, it would be a good start to track
901 static void reserve_mem(u64 base
, u64 size
)
903 u64 top
= base
+ size
;
904 unsigned long cnt
= RELOC(mem_reserve_cnt
);
909 /* We need to always keep one empty entry so that we
910 * have our terminator with "size" set to 0 since we are
911 * dumb and just copy this entire array to the boot params
913 base
= _ALIGN_DOWN(base
, PAGE_SIZE
);
914 top
= _ALIGN_UP(top
, PAGE_SIZE
);
917 if (cnt
>= (MEM_RESERVE_MAP_SIZE
- 1))
918 prom_panic("Memory reserve map exhausted !\n");
919 RELOC(mem_reserve_map
)[cnt
].base
= base
;
920 RELOC(mem_reserve_map
)[cnt
].size
= size
;
921 RELOC(mem_reserve_cnt
) = cnt
+ 1;
925 * Initialize memory allocation mecanism, parse "memory" nodes and
926 * obtain that way the top of memory and RMO to setup out local allocator
928 static void __init
prom_init_mem(void)
931 char *path
, type
[64];
934 struct prom_t
*_prom
= &RELOC(prom
);
938 * We iterate the memory nodes to find
939 * 1) top of RMO (first node)
943 prom_getprop(_prom
->root
, "#address-cells", &rac
, sizeof(rac
));
945 prom_getprop(_prom
->root
, "#size-cells", &rsc
, sizeof(rsc
));
946 prom_debug("root_addr_cells: %x\n", (unsigned long) rac
);
947 prom_debug("root_size_cells: %x\n", (unsigned long) rsc
);
949 prom_debug("scanning memory:\n");
950 path
= RELOC(prom_scratch
);
952 for (node
= 0; prom_next_node(&node
); ) {
954 prom_getprop(node
, "device_type", type
, sizeof(type
));
958 * CHRP Longtrail machines have no device_type
959 * on the memory node, so check the name instead...
961 prom_getprop(node
, "name", type
, sizeof(type
));
963 if (strcmp(type
, RELOC("memory")))
966 plen
= prom_getprop(node
, "reg", RELOC(regbuf
), sizeof(regbuf
));
967 if (plen
> sizeof(regbuf
)) {
968 prom_printf("memory node too large for buffer !\n");
969 plen
= sizeof(regbuf
);
972 endp
= p
+ (plen
/ sizeof(cell_t
));
975 memset(path
, 0, PROM_SCRATCH_SIZE
);
976 call_prom("package-to-path", 3, 1, node
, path
, PROM_SCRATCH_SIZE
-1);
977 prom_debug(" node %s :\n", path
);
978 #endif /* DEBUG_PROM */
980 while ((endp
- p
) >= (rac
+ rsc
)) {
981 unsigned long base
, size
;
983 base
= prom_next_cell(rac
, &p
);
984 size
= prom_next_cell(rsc
, &p
);
988 prom_debug(" %x %x\n", base
, size
);
990 RELOC(rmo_top
) = size
;
991 if ((base
+ size
) > RELOC(ram_top
))
992 RELOC(ram_top
) = base
+ size
;
996 RELOC(alloc_bottom
) = PAGE_ALIGN((unsigned long)&RELOC(_end
) + 0x4000);
998 /* Check if we have an initrd after the kernel, if we do move our bottom
1001 if (RELOC(prom_initrd_start
)) {
1002 if (RELOC(prom_initrd_end
) > RELOC(alloc_bottom
))
1003 RELOC(alloc_bottom
) = PAGE_ALIGN(RELOC(prom_initrd_end
));
1007 * If prom_memory_limit is set we reduce the upper limits *except* for
1008 * alloc_top_high. This must be the real top of RAM so we can put
1012 RELOC(alloc_top_high
) = RELOC(ram_top
);
1014 if (RELOC(prom_memory_limit
)) {
1015 if (RELOC(prom_memory_limit
) <= RELOC(alloc_bottom
)) {
1016 prom_printf("Ignoring mem=%x <= alloc_bottom.\n",
1017 RELOC(prom_memory_limit
));
1018 RELOC(prom_memory_limit
) = 0;
1019 } else if (RELOC(prom_memory_limit
) >= RELOC(ram_top
)) {
1020 prom_printf("Ignoring mem=%x >= ram_top.\n",
1021 RELOC(prom_memory_limit
));
1022 RELOC(prom_memory_limit
) = 0;
1024 RELOC(ram_top
) = RELOC(prom_memory_limit
);
1025 RELOC(rmo_top
) = min(RELOC(rmo_top
), RELOC(prom_memory_limit
));
1030 * Setup our top alloc point, that is top of RMO or top of
1031 * segment 0 when running non-LPAR.
1032 * Some RS64 machines have buggy firmware where claims up at
1033 * 1GB fail. Cap at 768MB as a workaround.
1034 * Since 768MB is plenty of room, and we need to cap to something
1035 * reasonable on 32-bit, cap at 768MB on all machines.
1037 if (!RELOC(rmo_top
))
1038 RELOC(rmo_top
) = RELOC(ram_top
);
1039 RELOC(rmo_top
) = min(0x30000000ul
, RELOC(rmo_top
));
1040 RELOC(alloc_top
) = RELOC(rmo_top
);
1042 prom_printf("memory layout at init:\n");
1043 prom_printf(" memory_limit : %x (16 MB aligned)\n", RELOC(prom_memory_limit
));
1044 prom_printf(" alloc_bottom : %x\n", RELOC(alloc_bottom
));
1045 prom_printf(" alloc_top : %x\n", RELOC(alloc_top
));
1046 prom_printf(" alloc_top_hi : %x\n", RELOC(alloc_top_high
));
1047 prom_printf(" rmo_top : %x\n", RELOC(rmo_top
));
1048 prom_printf(" ram_top : %x\n", RELOC(ram_top
));
1050 if (RELOC(prom_crashk_base
)) {
1051 prom_printf(" crashk_base : %x\n", RELOC(prom_crashk_base
));
1052 prom_printf(" crashk_size : %x\n", RELOC(prom_crashk_size
));
1059 * Allocate room for and instantiate RTAS
1061 static void __init
prom_instantiate_rtas(void)
1065 u32 base
, entry
= 0;
1068 prom_debug("prom_instantiate_rtas: start...\n");
1070 rtas_node
= call_prom("finddevice", 1, 1, ADDR("/rtas"));
1071 prom_debug("rtas_node: %x\n", rtas_node
);
1072 if (!PHANDLE_VALID(rtas_node
))
1075 prom_getprop(rtas_node
, "rtas-size", &size
, sizeof(size
));
1079 base
= alloc_down(size
, PAGE_SIZE
, 0);
1081 prom_printf("RTAS allocation failed !\n");
1085 rtas_inst
= call_prom("open", 1, 1, ADDR("/rtas"));
1086 if (!IHANDLE_VALID(rtas_inst
)) {
1087 prom_printf("opening rtas package failed (%x)\n", rtas_inst
);
1091 prom_printf("instantiating rtas at 0x%x ...", base
);
1093 if (call_prom_ret("call-method", 3, 2, &entry
,
1094 ADDR("instantiate-rtas"),
1095 rtas_inst
, base
) != 0
1097 prom_printf(" failed\n");
1100 prom_printf(" done\n");
1102 reserve_mem(base
, size
);
1104 prom_setprop(rtas_node
, "/rtas", "linux,rtas-base",
1105 &base
, sizeof(base
));
1106 prom_setprop(rtas_node
, "/rtas", "linux,rtas-entry",
1107 &entry
, sizeof(entry
));
1109 prom_debug("rtas base = 0x%x\n", base
);
1110 prom_debug("rtas entry = 0x%x\n", entry
);
1111 prom_debug("rtas size = 0x%x\n", (long)size
);
1113 prom_debug("prom_instantiate_rtas: end...\n");
1118 * Allocate room for and initialize TCE tables
1120 static void __init
prom_initialize_tce_table(void)
1124 char compatible
[64], type
[64], model
[64];
1125 char *path
= RELOC(prom_scratch
);
1127 u32 minalign
, minsize
;
1128 u64 tce_entry
, *tce_entryp
;
1129 u64 local_alloc_top
, local_alloc_bottom
;
1132 if (RELOC(ppc64_iommu_off
))
1135 prom_debug("starting prom_initialize_tce_table\n");
1137 /* Cache current top of allocs so we reserve a single block */
1138 local_alloc_top
= RELOC(alloc_top_high
);
1139 local_alloc_bottom
= local_alloc_top
;
1141 /* Search all nodes looking for PHBs. */
1142 for (node
= 0; prom_next_node(&node
); ) {
1146 prom_getprop(node
, "compatible",
1147 compatible
, sizeof(compatible
));
1148 prom_getprop(node
, "device_type", type
, sizeof(type
));
1149 prom_getprop(node
, "model", model
, sizeof(model
));
1151 if ((type
[0] == 0) || (strstr(type
, RELOC("pci")) == NULL
))
1154 /* Keep the old logic in tack to avoid regression. */
1155 if (compatible
[0] != 0) {
1156 if ((strstr(compatible
, RELOC("python")) == NULL
) &&
1157 (strstr(compatible
, RELOC("Speedwagon")) == NULL
) &&
1158 (strstr(compatible
, RELOC("Winnipeg")) == NULL
))
1160 } else if (model
[0] != 0) {
1161 if ((strstr(model
, RELOC("ython")) == NULL
) &&
1162 (strstr(model
, RELOC("peedwagon")) == NULL
) &&
1163 (strstr(model
, RELOC("innipeg")) == NULL
))
1167 if (prom_getprop(node
, "tce-table-minalign", &minalign
,
1168 sizeof(minalign
)) == PROM_ERROR
)
1170 if (prom_getprop(node
, "tce-table-minsize", &minsize
,
1171 sizeof(minsize
)) == PROM_ERROR
)
1172 minsize
= 4UL << 20;
1175 * Even though we read what OF wants, we just set the table
1176 * size to 4 MB. This is enough to map 2GB of PCI DMA space.
1177 * By doing this, we avoid the pitfalls of trying to DMA to
1178 * MMIO space and the DMA alias hole.
1180 * On POWER4, firmware sets the TCE region by assuming
1181 * each TCE table is 8MB. Using this memory for anything
1182 * else will impact performance, so we always allocate 8MB.
1185 if (__is_processor(PV_POWER4
) || __is_processor(PV_POWER4p
))
1186 minsize
= 8UL << 20;
1188 minsize
= 4UL << 20;
1190 /* Align to the greater of the align or size */
1191 align
= max(minalign
, minsize
);
1192 base
= alloc_down(minsize
, align
, 1);
1194 prom_panic("ERROR, cannot find space for TCE table.\n");
1195 if (base
< local_alloc_bottom
)
1196 local_alloc_bottom
= base
;
1198 /* It seems OF doesn't null-terminate the path :-( */
1199 memset(path
, 0, sizeof(path
));
1200 /* Call OF to setup the TCE hardware */
1201 if (call_prom("package-to-path", 3, 1, node
,
1202 path
, PROM_SCRATCH_SIZE
-1) == PROM_ERROR
) {
1203 prom_printf("package-to-path failed\n");
1206 /* Save away the TCE table attributes for later use. */
1207 prom_setprop(node
, path
, "linux,tce-base", &base
, sizeof(base
));
1208 prom_setprop(node
, path
, "linux,tce-size", &minsize
, sizeof(minsize
));
1210 prom_debug("TCE table: %s\n", path
);
1211 prom_debug("\tnode = 0x%x\n", node
);
1212 prom_debug("\tbase = 0x%x\n", base
);
1213 prom_debug("\tsize = 0x%x\n", minsize
);
1215 /* Initialize the table to have a one-to-one mapping
1216 * over the allocated size.
1218 tce_entryp
= (unsigned long *)base
;
1219 for (i
= 0; i
< (minsize
>> 3) ;tce_entryp
++, i
++) {
1220 tce_entry
= (i
<< PAGE_SHIFT
);
1222 *tce_entryp
= tce_entry
;
1225 prom_printf("opening PHB %s", path
);
1226 phb_node
= call_prom("open", 1, 1, path
);
1228 prom_printf("... failed\n");
1230 prom_printf("... done\n");
1232 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
1233 phb_node
, -1, minsize
,
1234 (u32
) base
, (u32
) (base
>> 32));
1235 call_prom("close", 1, 0, phb_node
);
1238 reserve_mem(local_alloc_bottom
, local_alloc_top
- local_alloc_bottom
);
1240 if (RELOC(prom_memory_limit
)) {
1242 * We align the start to a 16MB boundary so we can map
1243 * the TCE area using large pages if possible.
1244 * The end should be the top of RAM so no need to align it.
1246 RELOC(prom_tce_alloc_start
) = _ALIGN_DOWN(local_alloc_bottom
,
1248 RELOC(prom_tce_alloc_end
) = local_alloc_top
;
1251 /* Flag the first invalid entry */
1252 prom_debug("ending prom_initialize_tce_table\n");
1257 * With CHRP SMP we need to use the OF to start the other processors.
1258 * We can't wait until smp_boot_cpus (the OF is trashed by then)
1259 * so we have to put the processors into a holding pattern controlled
1260 * by the kernel (not OF) before we destroy the OF.
1262 * This uses a chunk of low memory, puts some holding pattern
1263 * code there and sends the other processors off to there until
1264 * smp_boot_cpus tells them to do something. The holding pattern
1265 * checks that address until its cpu # is there, when it is that
1266 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care
1267 * of setting those values.
1269 * We also use physical address 0x4 here to tell when a cpu
1270 * is in its holding pattern code.
1274 extern void __secondary_hold(void);
1275 extern unsigned long __secondary_hold_spinloop
;
1276 extern unsigned long __secondary_hold_acknowledge
;
1279 * We want to reference the copy of __secondary_hold_* in the
1280 * 0 - 0x100 address range
1282 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff)
1284 static void __init
prom_hold_cpus(void)
1291 unsigned int interrupt_server
[MAX_CPU_THREADS
];
1292 unsigned int cpu_threads
, hw_cpu_num
;
1294 struct prom_t
*_prom
= &RELOC(prom
);
1295 unsigned long *spinloop
1296 = (void *) LOW_ADDR(__secondary_hold_spinloop
);
1297 unsigned long *acknowledge
1298 = (void *) LOW_ADDR(__secondary_hold_acknowledge
);
1300 /* __secondary_hold is actually a descriptor, not the text address */
1301 unsigned long secondary_hold
1302 = __pa(*PTRRELOC((unsigned long *)__secondary_hold
));
1304 unsigned long secondary_hold
= LOW_ADDR(__secondary_hold
);
1307 prom_debug("prom_hold_cpus: start...\n");
1308 prom_debug(" 1) spinloop = 0x%x\n", (unsigned long)spinloop
);
1309 prom_debug(" 1) *spinloop = 0x%x\n", *spinloop
);
1310 prom_debug(" 1) acknowledge = 0x%x\n",
1311 (unsigned long)acknowledge
);
1312 prom_debug(" 1) *acknowledge = 0x%x\n", *acknowledge
);
1313 prom_debug(" 1) secondary_hold = 0x%x\n", secondary_hold
);
1315 /* Set the common spinloop variable, so all of the secondary cpus
1316 * will block when they are awakened from their OF spinloop.
1317 * This must occur for both SMP and non SMP kernels, since OF will
1318 * be trashed when we move the kernel.
1323 for (i
= 0; i
< NR_CPUS
; i
++)
1324 RELOC(hmt_thread_data
)[i
].pir
= 0xdeadbeef;
1327 for (node
= 0; prom_next_node(&node
); ) {
1329 prom_getprop(node
, "device_type", type
, sizeof(type
));
1330 if (strcmp(type
, RELOC("cpu")) != 0)
1333 /* Skip non-configured cpus. */
1334 if (prom_getprop(node
, "status", type
, sizeof(type
)) > 0)
1335 if (strcmp(type
, RELOC("okay")) != 0)
1339 prom_getprop(node
, "reg", ®
, sizeof(reg
));
1341 prom_debug("\ncpuid = 0x%x\n", cpuid
);
1342 prom_debug("cpu hw idx = 0x%x\n", reg
);
1344 /* Init the acknowledge var which will be reset by
1345 * the secondary cpu when it awakens from its OF
1348 *acknowledge
= (unsigned long)-1;
1350 propsize
= prom_getprop(node
, "ibm,ppc-interrupt-server#s",
1352 sizeof(interrupt_server
));
1354 /* no property. old hardware has no SMT */
1356 interrupt_server
[0] = reg
; /* fake it with phys id */
1358 /* We have a threaded processor */
1359 cpu_threads
= propsize
/ sizeof(u32
);
1360 if (cpu_threads
> MAX_CPU_THREADS
) {
1361 prom_printf("SMT: too many threads!\n"
1362 "SMT: found %x, max is %x\n",
1363 cpu_threads
, MAX_CPU_THREADS
);
1364 cpu_threads
= 1; /* ToDo: panic? */
1368 hw_cpu_num
= interrupt_server
[0];
1369 if (hw_cpu_num
!= _prom
->cpu
) {
1370 /* Primary Thread of non-boot cpu */
1371 prom_printf("%x : starting cpu hw idx %x... ", cpuid
, reg
);
1372 call_prom("start-cpu", 3, 0, node
,
1373 secondary_hold
, reg
);
1375 for (i
= 0; (i
< 100000000) &&
1376 (*acknowledge
== ((unsigned long)-1)); i
++ )
1379 if (*acknowledge
== reg
)
1380 prom_printf("done\n");
1382 prom_printf("failed: %x\n", *acknowledge
);
1386 prom_printf("%x : boot cpu %x\n", cpuid
, reg
);
1387 #endif /* CONFIG_SMP */
1389 /* Reserve cpu #s for secondary threads. They start later. */
1390 cpuid
+= cpu_threads
;
1393 /* Only enable HMT on processors that provide support. */
1394 if (__is_processor(PV_PULSAR
) ||
1395 __is_processor(PV_ICESTAR
) ||
1396 __is_processor(PV_SSTAR
)) {
1397 prom_printf(" starting secondary threads\n");
1399 for (i
= 0; i
< NR_CPUS
; i
+= 2) {
1404 unsigned long pir
= mfspr(SPRN_PIR
);
1405 if (__is_processor(PV_PULSAR
)) {
1406 RELOC(hmt_thread_data
)[i
].pir
=
1409 RELOC(hmt_thread_data
)[i
].pir
=
1415 prom_printf("Processor is not HMT capable\n");
1419 if (cpuid
> NR_CPUS
)
1420 prom_printf("WARNING: maximum CPUs (" __stringify(NR_CPUS
)
1421 ") exceeded: ignoring extras\n");
1423 prom_debug("prom_hold_cpus: end...\n");
1427 static void __init
prom_init_client_services(unsigned long pp
)
1429 struct prom_t
*_prom
= &RELOC(prom
);
1431 /* Get a handle to the prom entry point before anything else */
1432 RELOC(prom_entry
) = pp
;
1434 /* get a handle for the stdout device */
1435 _prom
->chosen
= call_prom("finddevice", 1, 1, ADDR("/chosen"));
1436 if (!PHANDLE_VALID(_prom
->chosen
))
1437 prom_panic("cannot find chosen"); /* msg won't be printed :( */
1439 /* get device tree root */
1440 _prom
->root
= call_prom("finddevice", 1, 1, ADDR("/"));
1441 if (!PHANDLE_VALID(_prom
->root
))
1442 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
1449 * For really old powermacs, we need to map things we claim.
1450 * For that, we need the ihandle of the mmu.
1451 * Also, on the longtrail, we need to work around other bugs.
1453 static void __init
prom_find_mmu(void)
1455 struct prom_t
*_prom
= &RELOC(prom
);
1459 oprom
= call_prom("finddevice", 1, 1, ADDR("/openprom"));
1460 if (!PHANDLE_VALID(oprom
))
1462 if (prom_getprop(oprom
, "model", version
, sizeof(version
)) <= 0)
1464 version
[sizeof(version
) - 1] = 0;
1465 /* XXX might need to add other versions here */
1466 if (strcmp(version
, "Open Firmware, 1.0.5") == 0)
1467 of_workarounds
= OF_WA_CLAIM
;
1468 else if (strncmp(version
, "FirmWorks,3.", 12) == 0) {
1469 of_workarounds
= OF_WA_CLAIM
| OF_WA_LONGTRAIL
;
1470 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
1473 _prom
->memory
= call_prom("open", 1, 1, ADDR("/memory"));
1474 prom_getprop(_prom
->chosen
, "mmu", &_prom
->mmumap
,
1475 sizeof(_prom
->mmumap
));
1476 if (!IHANDLE_VALID(_prom
->memory
) || !IHANDLE_VALID(_prom
->mmumap
))
1477 of_workarounds
&= ~OF_WA_CLAIM
; /* hmmm */
1480 #define prom_find_mmu()
1483 static void __init
prom_init_stdout(void)
1485 struct prom_t
*_prom
= &RELOC(prom
);
1486 char *path
= RELOC(of_stdout_device
);
1490 if (prom_getprop(_prom
->chosen
, "stdout", &val
, sizeof(val
)) <= 0)
1491 prom_panic("cannot find stdout");
1493 _prom
->stdout
= val
;
1495 /* Get the full OF pathname of the stdout device */
1496 memset(path
, 0, 256);
1497 call_prom("instance-to-path", 3, 1, _prom
->stdout
, path
, 255);
1498 val
= call_prom("instance-to-package", 1, 1, _prom
->stdout
);
1499 prom_setprop(_prom
->chosen
, "/chosen", "linux,stdout-package",
1501 prom_printf("OF stdout device is: %s\n", RELOC(of_stdout_device
));
1502 prom_setprop(_prom
->chosen
, "/chosen", "linux,stdout-path",
1503 path
, strlen(path
) + 1);
1505 /* If it's a display, note it */
1506 memset(type
, 0, sizeof(type
));
1507 prom_getprop(val
, "device_type", type
, sizeof(type
));
1508 if (strcmp(type
, RELOC("display")) == 0)
1509 prom_setprop(val
, path
, "linux,boot-display", NULL
, 0);
1512 static void __init
prom_close_stdin(void)
1514 struct prom_t
*_prom
= &RELOC(prom
);
1517 if (prom_getprop(_prom
->chosen
, "stdin", &val
, sizeof(val
)) > 0)
1518 call_prom("close", 1, 0, val
);
1521 static int __init
prom_find_machine_type(void)
1523 struct prom_t
*_prom
= &RELOC(prom
);
1529 len
= prom_getprop(_prom
->root
, "compatible",
1530 compat
, sizeof(compat
)-1);
1534 char *p
= &compat
[i
];
1538 if (strstr(p
, RELOC("Power Macintosh")) ||
1539 strstr(p
, RELOC("MacRISC")))
1540 return PLATFORM_POWERMAC
;
1542 if (strstr(p
, RELOC("Momentum,Maple")))
1543 return PLATFORM_MAPLE
;
1544 if (strstr(p
, RELOC("IBM,CPB")))
1545 return PLATFORM_CELL
;
1551 /* Default to pSeries. We need to know if we are running LPAR */
1552 rtas
= call_prom("finddevice", 1, 1, ADDR("/rtas"));
1553 if (PHANDLE_VALID(rtas
)) {
1554 int x
= prom_getproplen(rtas
, "ibm,hypertas-functions");
1555 if (x
!= PROM_ERROR
) {
1556 prom_printf("Hypertas detected, assuming LPAR !\n");
1557 return PLATFORM_PSERIES_LPAR
;
1560 return PLATFORM_PSERIES
;
1562 return PLATFORM_CHRP
;
1566 static int __init
prom_set_color(ihandle ih
, int i
, int r
, int g
, int b
)
1568 return call_prom("call-method", 6, 1, ADDR("color!"), ih
, i
, b
, g
, r
);
1572 * If we have a display that we don't know how to drive,
1573 * we will want to try to execute OF's open method for it
1574 * later. However, OF will probably fall over if we do that
1575 * we've taken over the MMU.
1576 * So we check whether we will need to open the display,
1577 * and if so, open it now.
1579 static void __init
prom_check_displays(void)
1581 char type
[16], *path
;
1586 static unsigned char default_colors
[] = {
1604 const unsigned char *clut
;
1606 prom_printf("Looking for displays\n");
1607 for (node
= 0; prom_next_node(&node
); ) {
1608 memset(type
, 0, sizeof(type
));
1609 prom_getprop(node
, "device_type", type
, sizeof(type
));
1610 if (strcmp(type
, RELOC("display")) != 0)
1613 /* It seems OF doesn't null-terminate the path :-( */
1614 path
= RELOC(prom_scratch
);
1615 memset(path
, 0, PROM_SCRATCH_SIZE
);
1618 * leave some room at the end of the path for appending extra
1621 if (call_prom("package-to-path", 3, 1, node
, path
,
1622 PROM_SCRATCH_SIZE
-10) == PROM_ERROR
)
1624 prom_printf("found display : %s, opening ... ", path
);
1626 ih
= call_prom("open", 1, 1, path
);
1628 prom_printf("failed\n");
1633 prom_printf("done\n");
1634 prom_setprop(node
, path
, "linux,opened", NULL
, 0);
1636 /* Setup a usable color table when the appropriate
1637 * method is available. Should update this to set-colors */
1638 clut
= RELOC(default_colors
);
1639 for (i
= 0; i
< 32; i
++, clut
+= 3)
1640 if (prom_set_color(ih
, i
, clut
[0], clut
[1],
1644 #ifdef CONFIG_LOGO_LINUX_CLUT224
1645 clut
= PTRRELOC(RELOC(logo_linux_clut224
.clut
));
1646 for (i
= 0; i
< RELOC(logo_linux_clut224
.clutsize
); i
++, clut
+= 3)
1647 if (prom_set_color(ih
, i
+ 32, clut
[0], clut
[1],
1650 #endif /* CONFIG_LOGO_LINUX_CLUT224 */
1655 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */
1656 static void __init
*make_room(unsigned long *mem_start
, unsigned long *mem_end
,
1657 unsigned long needed
, unsigned long align
)
1661 *mem_start
= _ALIGN(*mem_start
, align
);
1662 while ((*mem_start
+ needed
) > *mem_end
) {
1663 unsigned long room
, chunk
;
1665 prom_debug("Chunk exhausted, claiming more at %x...\n",
1666 RELOC(alloc_bottom
));
1667 room
= RELOC(alloc_top
) - RELOC(alloc_bottom
);
1668 if (room
> DEVTREE_CHUNK_SIZE
)
1669 room
= DEVTREE_CHUNK_SIZE
;
1670 if (room
< PAGE_SIZE
)
1671 prom_panic("No memory for flatten_device_tree (no room)");
1672 chunk
= alloc_up(room
, 0);
1674 prom_panic("No memory for flatten_device_tree (claim failed)");
1675 *mem_end
= RELOC(alloc_top
);
1678 ret
= (void *)*mem_start
;
1679 *mem_start
+= needed
;
1684 #define dt_push_token(token, mem_start, mem_end) \
1685 do { *((u32 *)make_room(mem_start, mem_end, 4, 4)) = token; } while(0)
1687 static unsigned long __init
dt_find_string(char *str
)
1691 s
= os
= (char *)RELOC(dt_string_start
);
1693 while (s
< (char *)RELOC(dt_string_end
)) {
1694 if (strcmp(s
, str
) == 0)
1702 * The Open Firmware 1275 specification states properties must be 31 bytes or
1703 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
1705 #define MAX_PROPERTY_NAME 64
1707 static void __init
scan_dt_build_strings(phandle node
,
1708 unsigned long *mem_start
,
1709 unsigned long *mem_end
)
1711 char *prev_name
, *namep
, *sstart
;
1715 sstart
= (char *)RELOC(dt_string_start
);
1717 /* get and store all property names */
1718 prev_name
= RELOC("");
1720 /* 64 is max len of name including nul. */
1721 namep
= make_room(mem_start
, mem_end
, MAX_PROPERTY_NAME
, 1);
1722 if (call_prom("nextprop", 3, 1, node
, prev_name
, namep
) != 1) {
1723 /* No more nodes: unwind alloc */
1724 *mem_start
= (unsigned long)namep
;
1729 if (strcmp(namep
, RELOC("name")) == 0) {
1730 *mem_start
= (unsigned long)namep
;
1731 prev_name
= RELOC("name");
1734 /* get/create string entry */
1735 soff
= dt_find_string(namep
);
1737 *mem_start
= (unsigned long)namep
;
1738 namep
= sstart
+ soff
;
1740 /* Trim off some if we can */
1741 *mem_start
= (unsigned long)namep
+ strlen(namep
) + 1;
1742 RELOC(dt_string_end
) = *mem_start
;
1747 /* do all our children */
1748 child
= call_prom("child", 1, 1, node
);
1749 while (child
!= 0) {
1750 scan_dt_build_strings(child
, mem_start
, mem_end
);
1751 child
= call_prom("peer", 1, 1, child
);
1755 static void __init
scan_dt_build_struct(phandle node
, unsigned long *mem_start
,
1756 unsigned long *mem_end
)
1759 char *namep
, *prev_name
, *sstart
, *p
, *ep
, *lp
, *path
;
1761 unsigned char *valp
;
1762 static char pname
[MAX_PROPERTY_NAME
];
1765 dt_push_token(OF_DT_BEGIN_NODE
, mem_start
, mem_end
);
1767 /* get the node's full name */
1768 namep
= (char *)*mem_start
;
1769 room
= *mem_end
- *mem_start
;
1772 l
= call_prom("package-to-path", 3, 1, node
, namep
, room
);
1774 /* Didn't fit? Get more room. */
1776 if (l
>= *mem_end
- *mem_start
)
1777 namep
= make_room(mem_start
, mem_end
, l
+1, 1);
1778 call_prom("package-to-path", 3, 1, node
, namep
, l
);
1782 /* Fixup an Apple bug where they have bogus \0 chars in the
1783 * middle of the path in some properties, and extract
1784 * the unit name (everything after the last '/').
1786 for (lp
= p
= namep
, ep
= namep
+ l
; p
< ep
; p
++) {
1793 *mem_start
= _ALIGN((unsigned long)lp
+ 1, 4);
1796 /* get it again for debugging */
1797 path
= RELOC(prom_scratch
);
1798 memset(path
, 0, PROM_SCRATCH_SIZE
);
1799 call_prom("package-to-path", 3, 1, node
, path
, PROM_SCRATCH_SIZE
-1);
1801 /* get and store all properties */
1802 prev_name
= RELOC("");
1803 sstart
= (char *)RELOC(dt_string_start
);
1805 if (call_prom("nextprop", 3, 1, node
, prev_name
,
1810 if (strcmp(RELOC(pname
), RELOC("name")) == 0) {
1811 prev_name
= RELOC("name");
1815 /* find string offset */
1816 soff
= dt_find_string(RELOC(pname
));
1818 prom_printf("WARNING: Can't find string index for"
1819 " <%s>, node %s\n", RELOC(pname
), path
);
1822 prev_name
= sstart
+ soff
;
1825 l
= call_prom("getproplen", 2, 1, node
, RELOC(pname
));
1828 if (l
== PROM_ERROR
)
1830 if (l
> MAX_PROPERTY_LENGTH
) {
1831 prom_printf("WARNING: ignoring large property ");
1832 /* It seems OF doesn't null-terminate the path :-( */
1833 prom_printf("[%s] ", path
);
1834 prom_printf("%s length 0x%x\n", RELOC(pname
), l
);
1838 /* push property head */
1839 dt_push_token(OF_DT_PROP
, mem_start
, mem_end
);
1840 dt_push_token(l
, mem_start
, mem_end
);
1841 dt_push_token(soff
, mem_start
, mem_end
);
1843 /* push property content */
1844 valp
= make_room(mem_start
, mem_end
, l
, 4);
1845 call_prom("getprop", 4, 1, node
, RELOC(pname
), valp
, l
);
1846 *mem_start
= _ALIGN(*mem_start
, 4);
1849 /* Add a "linux,phandle" property. */
1850 soff
= dt_find_string(RELOC("linux,phandle"));
1852 prom_printf("WARNING: Can't find string index for"
1853 " <linux-phandle> node %s\n", path
);
1855 dt_push_token(OF_DT_PROP
, mem_start
, mem_end
);
1856 dt_push_token(4, mem_start
, mem_end
);
1857 dt_push_token(soff
, mem_start
, mem_end
);
1858 valp
= make_room(mem_start
, mem_end
, 4, 4);
1859 *(u32
*)valp
= node
;
1862 /* do all our children */
1863 child
= call_prom("child", 1, 1, node
);
1864 while (child
!= 0) {
1865 scan_dt_build_struct(child
, mem_start
, mem_end
);
1866 child
= call_prom("peer", 1, 1, child
);
1869 dt_push_token(OF_DT_END_NODE
, mem_start
, mem_end
);
1872 static void __init
flatten_device_tree(void)
1875 unsigned long mem_start
, mem_end
, room
;
1876 struct boot_param_header
*hdr
;
1877 struct prom_t
*_prom
= &RELOC(prom
);
1882 * Check how much room we have between alloc top & bottom (+/- a
1883 * few pages), crop to 4Mb, as this is our "chuck" size
1885 room
= RELOC(alloc_top
) - RELOC(alloc_bottom
) - 0x4000;
1886 if (room
> DEVTREE_CHUNK_SIZE
)
1887 room
= DEVTREE_CHUNK_SIZE
;
1888 prom_debug("starting device tree allocs at %x\n", RELOC(alloc_bottom
));
1890 /* Now try to claim that */
1891 mem_start
= (unsigned long)alloc_up(room
, PAGE_SIZE
);
1893 prom_panic("Can't allocate initial device-tree chunk\n");
1894 mem_end
= RELOC(alloc_top
);
1896 /* Get root of tree */
1897 root
= call_prom("peer", 1, 1, (phandle
)0);
1898 if (root
== (phandle
)0)
1899 prom_panic ("couldn't get device tree root\n");
1901 /* Build header and make room for mem rsv map */
1902 mem_start
= _ALIGN(mem_start
, 4);
1903 hdr
= make_room(&mem_start
, &mem_end
,
1904 sizeof(struct boot_param_header
), 4);
1905 RELOC(dt_header_start
) = (unsigned long)hdr
;
1906 rsvmap
= make_room(&mem_start
, &mem_end
, sizeof(mem_reserve_map
), 8);
1908 /* Start of strings */
1909 mem_start
= PAGE_ALIGN(mem_start
);
1910 RELOC(dt_string_start
) = mem_start
;
1911 mem_start
+= 4; /* hole */
1913 /* Add "linux,phandle" in there, we'll need it */
1914 namep
= make_room(&mem_start
, &mem_end
, 16, 1);
1915 strcpy(namep
, RELOC("linux,phandle"));
1916 mem_start
= (unsigned long)namep
+ strlen(namep
) + 1;
1918 /* Build string array */
1919 prom_printf("Building dt strings...\n");
1920 scan_dt_build_strings(root
, &mem_start
, &mem_end
);
1921 RELOC(dt_string_end
) = mem_start
;
1923 /* Build structure */
1924 mem_start
= PAGE_ALIGN(mem_start
);
1925 RELOC(dt_struct_start
) = mem_start
;
1926 prom_printf("Building dt structure...\n");
1927 scan_dt_build_struct(root
, &mem_start
, &mem_end
);
1928 dt_push_token(OF_DT_END
, &mem_start
, &mem_end
);
1929 RELOC(dt_struct_end
) = PAGE_ALIGN(mem_start
);
1932 hdr
->boot_cpuid_phys
= _prom
->cpu
;
1933 hdr
->magic
= OF_DT_HEADER
;
1934 hdr
->totalsize
= RELOC(dt_struct_end
) - RELOC(dt_header_start
);
1935 hdr
->off_dt_struct
= RELOC(dt_struct_start
) - RELOC(dt_header_start
);
1936 hdr
->off_dt_strings
= RELOC(dt_string_start
) - RELOC(dt_header_start
);
1937 hdr
->dt_strings_size
= RELOC(dt_string_end
) - RELOC(dt_string_start
);
1938 hdr
->off_mem_rsvmap
= ((unsigned long)rsvmap
) - RELOC(dt_header_start
);
1939 hdr
->version
= OF_DT_VERSION
;
1940 /* Version 16 is not backward compatible */
1941 hdr
->last_comp_version
= 0x10;
1943 /* Reserve the whole thing and copy the reserve map in, we
1944 * also bump mem_reserve_cnt to cause further reservations to
1945 * fail since it's too late.
1947 reserve_mem(RELOC(dt_header_start
), hdr
->totalsize
);
1948 memcpy(rsvmap
, RELOC(mem_reserve_map
), sizeof(mem_reserve_map
));
1953 prom_printf("reserved memory map:\n");
1954 for (i
= 0; i
< RELOC(mem_reserve_cnt
); i
++)
1955 prom_printf(" %x - %x\n",
1956 RELOC(mem_reserve_map
)[i
].base
,
1957 RELOC(mem_reserve_map
)[i
].size
);
1960 RELOC(mem_reserve_cnt
) = MEM_RESERVE_MAP_SIZE
;
1962 prom_printf("Device tree strings 0x%x -> 0x%x\n",
1963 RELOC(dt_string_start
), RELOC(dt_string_end
));
1964 prom_printf("Device tree struct 0x%x -> 0x%x\n",
1965 RELOC(dt_struct_start
), RELOC(dt_struct_end
));
1970 static void __init
fixup_device_tree(void)
1972 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
1973 phandle u3
, i2c
, mpic
;
1978 /* Some G5s have a missing interrupt definition, fix it up here */
1979 u3
= call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
1980 if (!PHANDLE_VALID(u3
))
1982 i2c
= call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
1983 if (!PHANDLE_VALID(i2c
))
1985 mpic
= call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
1986 if (!PHANDLE_VALID(mpic
))
1989 /* check if proper rev of u3 */
1990 if (prom_getprop(u3
, "device-rev", &u3_rev
, sizeof(u3_rev
))
1993 if (u3_rev
< 0x35 || u3_rev
> 0x39)
1995 /* does it need fixup ? */
1996 if (prom_getproplen(i2c
, "interrupts") > 0)
1999 prom_printf("fixing up bogus interrupts for u3 i2c...\n");
2001 /* interrupt on this revision of u3 is number 0 and level */
2004 prom_setprop(i2c
, "/u3@0,f8000000/i2c@f8001000", "interrupts",
2005 &interrupts
, sizeof(interrupts
));
2007 prom_setprop(i2c
, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
2008 &parent
, sizeof(parent
));
2013 static void __init
prom_find_boot_cpu(void)
2015 struct prom_t
*_prom
= &RELOC(prom
);
2021 if (prom_getprop(_prom
->chosen
, "cpu", &prom_cpu
, sizeof(prom_cpu
)) <= 0)
2024 cpu_pkg
= call_prom("instance-to-package", 1, 1, prom_cpu
);
2026 prom_getprop(cpu_pkg
, "reg", &getprop_rval
, sizeof(getprop_rval
));
2027 _prom
->cpu
= getprop_rval
;
2029 prom_debug("Booting CPU hw index = 0x%x\n", _prom
->cpu
);
2032 static void __init
prom_check_initrd(unsigned long r3
, unsigned long r4
)
2034 #ifdef CONFIG_BLK_DEV_INITRD
2035 struct prom_t
*_prom
= &RELOC(prom
);
2037 if (r3
&& r4
&& r4
!= 0xdeadbeef) {
2040 RELOC(prom_initrd_start
) = is_kernel_addr(r3
) ? __pa(r3
) : r3
;
2041 RELOC(prom_initrd_end
) = RELOC(prom_initrd_start
) + r4
;
2043 val
= RELOC(prom_initrd_start
);
2044 prom_setprop(_prom
->chosen
, "/chosen", "linux,initrd-start",
2046 val
= RELOC(prom_initrd_end
);
2047 prom_setprop(_prom
->chosen
, "/chosen", "linux,initrd-end",
2050 reserve_mem(RELOC(prom_initrd_start
),
2051 RELOC(prom_initrd_end
) - RELOC(prom_initrd_start
));
2053 prom_debug("initrd_start=0x%x\n", RELOC(prom_initrd_start
));
2054 prom_debug("initrd_end=0x%x\n", RELOC(prom_initrd_end
));
2056 #endif /* CONFIG_BLK_DEV_INITRD */
2060 * We enter here early on, when the Open Firmware prom is still
2061 * handling exceptions and the MMU hash table for us.
2064 unsigned long __init
prom_init(unsigned long r3
, unsigned long r4
,
2066 unsigned long r6
, unsigned long r7
)
2068 struct prom_t
*_prom
;
2071 unsigned long offset
= reloc_offset();
2077 _prom
= &RELOC(prom
);
2080 * First zero the BSS
2082 memset(&RELOC(__bss_start
), 0, __bss_stop
- __bss_start
);
2085 * Init interface to Open Firmware, get some node references,
2088 prom_init_client_services(pp
);
2091 * See if this OF is old enough that we need to do explicit maps
2092 * and other workarounds
2097 * Init prom stdout device
2102 * Check for an initrd
2104 prom_check_initrd(r3
, r4
);
2107 * Get default machine type. At this point, we do not differentiate
2108 * between pSeries SMP and pSeries LPAR
2110 RELOC(of_platform
) = prom_find_machine_type();
2111 getprop_rval
= RELOC(of_platform
);
2112 prom_setprop(_prom
->chosen
, "/chosen", "linux,platform",
2113 &getprop_rval
, sizeof(getprop_rval
));
2115 #ifdef CONFIG_PPC_PSERIES
2117 * On pSeries, inform the firmware about our capabilities
2119 if (RELOC(of_platform
) == PLATFORM_PSERIES
||
2120 RELOC(of_platform
) == PLATFORM_PSERIES_LPAR
)
2121 prom_send_capabilities();
2125 * Copy the CPU hold code
2127 if (RELOC(of_platform
) != PLATFORM_POWERMAC
)
2128 copy_and_flush(0, KERNELBASE
+ offset
, 0x100, 0);
2131 * Do early parsing of command line
2133 early_cmdline_parse();
2136 * Initialize memory management within prom_init
2141 if (RELOC(prom_crashk_base
))
2142 reserve_mem(RELOC(prom_crashk_base
), RELOC(prom_crashk_size
));
2145 * Determine which cpu is actually running right _now_
2147 prom_find_boot_cpu();
2150 * Initialize display devices
2152 prom_check_displays();
2156 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
2157 * that uses the allocator, we need to make sure we get the top of memory
2158 * available for us here...
2160 if (RELOC(of_platform
) == PLATFORM_PSERIES
)
2161 prom_initialize_tce_table();
2165 * On non-powermacs, try to instantiate RTAS and puts all CPUs
2166 * in spin-loops. PowerMacs don't have a working RTAS and use
2167 * a different way to spin CPUs
2169 if (RELOC(of_platform
) != PLATFORM_POWERMAC
) {
2170 prom_instantiate_rtas();
2175 * Fill in some infos for use by the kernel later on
2177 if (RELOC(prom_memory_limit
))
2178 prom_setprop(_prom
->chosen
, "/chosen", "linux,memory-limit",
2179 &RELOC(prom_memory_limit
),
2180 sizeof(prom_memory_limit
));
2182 if (RELOC(ppc64_iommu_off
))
2183 prom_setprop(_prom
->chosen
, "/chosen", "linux,iommu-off",
2186 if (RELOC(iommu_force_on
))
2187 prom_setprop(_prom
->chosen
, "/chosen", "linux,iommu-force-on",
2190 if (RELOC(prom_tce_alloc_start
)) {
2191 prom_setprop(_prom
->chosen
, "/chosen", "linux,tce-alloc-start",
2192 &RELOC(prom_tce_alloc_start
),
2193 sizeof(prom_tce_alloc_start
));
2194 prom_setprop(_prom
->chosen
, "/chosen", "linux,tce-alloc-end",
2195 &RELOC(prom_tce_alloc_end
),
2196 sizeof(prom_tce_alloc_end
));
2201 if (RELOC(prom_crashk_base
)) {
2202 prom_setprop(_prom
->chosen
, "/chosen", "linux,crashkernel-base",
2203 PTRRELOC(&prom_crashk_base
),
2204 sizeof(RELOC(prom_crashk_base
)));
2205 prom_setprop(_prom
->chosen
, "/chosen", "linux,crashkernel-size",
2206 PTRRELOC(&prom_crashk_size
),
2207 sizeof(RELOC(prom_crashk_size
)));
2211 * Fixup any known bugs in the device-tree
2213 fixup_device_tree();
2216 * Now finally create the flattened device-tree
2218 prom_printf("copying OF device tree ...\n");
2219 flatten_device_tree();
2222 * in case stdin is USB and still active on IBM machines...
2223 * Unfortunately quiesce crashes on some powermacs if we have
2224 * closed stdin already (in particular the powerbook 101).
2226 if (RELOC(of_platform
) != PLATFORM_POWERMAC
)
2230 * Call OF "quiesce" method to shut down pending DMA's from
2233 prom_printf("Calling quiesce ...\n");
2234 call_prom("quiesce", 0, 0);
2237 * And finally, call the kernel passing it the flattened device
2238 * tree and NULL as r5, thus triggering the new entry point which
2239 * is common to us and kexec
2241 hdr
= RELOC(dt_header_start
);
2242 prom_printf("returning from prom_init\n");
2243 prom_debug("->dt_header_start=0x%x\n", hdr
);
2246 reloc_got2(-offset
);
2249 __start(hdr
, KERNELBASE
+ offset
, 0);