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))
99 #define ADDR(x) (u32) (x)
102 #define PROM_BUG() do { \
103 prom_printf("kernel BUG at %s line 0x%x!\n", \
104 RELOC(__FILE__), __LINE__); \
105 __asm__ __volatile__(".long " BUG_ILLEGAL_INSTR); \
109 #define prom_debug(x...) prom_printf(x)
111 #define prom_debug(x...)
115 #define PLATFORM_POWERMAC _MACH_Pmac
116 #define PLATFORM_CHRP _MACH_chrp
120 typedef u32 prom_arg_t
;
137 struct mem_map_entry
{
144 extern void __start(unsigned long r3
, unsigned long r4
, unsigned long r5
);
147 extern int enter_prom(struct prom_args
*args
, unsigned long entry
);
149 static inline int enter_prom(struct prom_args
*args
, unsigned long entry
)
151 return ((int (*)(struct prom_args
*))entry
)(args
);
155 extern void copy_and_flush(unsigned long dest
, unsigned long src
,
156 unsigned long size
, unsigned long offset
);
159 static struct prom_t __initdata prom
;
161 static unsigned long prom_entry __initdata
;
163 #define PROM_SCRATCH_SIZE 256
165 static char __initdata of_stdout_device
[256];
166 static char __initdata prom_scratch
[PROM_SCRATCH_SIZE
];
168 static unsigned long __initdata dt_header_start
;
169 static unsigned long __initdata dt_struct_start
, dt_struct_end
;
170 static unsigned long __initdata dt_string_start
, dt_string_end
;
172 static unsigned long __initdata prom_initrd_start
, prom_initrd_end
;
175 static int __initdata iommu_force_on
;
176 static int __initdata ppc64_iommu_off
;
177 static unsigned long __initdata prom_tce_alloc_start
;
178 static unsigned long __initdata prom_tce_alloc_end
;
181 static int __initdata of_platform
;
183 static char __initdata prom_cmd_line
[COMMAND_LINE_SIZE
];
185 static unsigned long __initdata prom_memory_limit
;
187 static unsigned long __initdata alloc_top
;
188 static unsigned long __initdata alloc_top_high
;
189 static unsigned long __initdata alloc_bottom
;
190 static unsigned long __initdata rmo_top
;
191 static unsigned long __initdata ram_top
;
193 static struct mem_map_entry __initdata mem_reserve_map
[MEM_RESERVE_MAP_SIZE
];
194 static int __initdata mem_reserve_cnt
;
196 static cell_t __initdata regbuf
[1024];
199 #define MAX_CPU_THREADS 2
205 unsigned int threadid
;
206 } hmt_thread_data
[NR_CPUS
];
207 #endif /* CONFIG_HMT */
210 * Error results ... some OF calls will return "-1" on error, some
211 * will return 0, some will return either. To simplify, here are
212 * macros to use with any ihandle or phandle return value to check if
216 #define PROM_ERROR (-1u)
217 #define PHANDLE_VALID(p) ((p) != 0 && (p) != PROM_ERROR)
218 #define IHANDLE_VALID(i) ((i) != 0 && (i) != PROM_ERROR)
221 /* This is the one and *ONLY* place where we actually call open
225 static int __init
call_prom(const char *service
, int nargs
, int nret
, ...)
228 struct prom_args args
;
231 args
.service
= ADDR(service
);
235 va_start(list
, nret
);
236 for (i
= 0; i
< nargs
; i
++)
237 args
.args
[i
] = va_arg(list
, prom_arg_t
);
240 for (i
= 0; i
< nret
; i
++)
241 args
.args
[nargs
+i
] = 0;
243 if (enter_prom(&args
, RELOC(prom_entry
)) < 0)
246 return (nret
> 0) ? args
.args
[nargs
] : 0;
249 static int __init
call_prom_ret(const char *service
, int nargs
, int nret
,
250 prom_arg_t
*rets
, ...)
253 struct prom_args args
;
256 args
.service
= ADDR(service
);
260 va_start(list
, rets
);
261 for (i
= 0; i
< nargs
; i
++)
262 args
.args
[i
] = va_arg(list
, prom_arg_t
);
265 for (i
= 0; i
< nret
; i
++)
268 if (enter_prom(&args
, RELOC(prom_entry
)) < 0)
272 for (i
= 1; i
< nret
; ++i
)
273 rets
[i
-1] = args
.args
[nargs
+i
];
275 return (nret
> 0) ? args
.args
[nargs
] : 0;
279 static void __init
prom_print(const char *msg
)
282 struct prom_t
*_prom
= &RELOC(prom
);
284 if (_prom
->stdout
== 0)
287 for (p
= msg
; *p
!= 0; p
= q
) {
288 for (q
= p
; *q
!= 0 && *q
!= '\n'; ++q
)
291 call_prom("write", 3, 1, _prom
->stdout
, p
, q
- p
);
295 call_prom("write", 3, 1, _prom
->stdout
, ADDR("\r\n"), 2);
300 static void __init
prom_print_hex(unsigned long val
)
302 int i
, nibbles
= sizeof(val
)*2;
303 char buf
[sizeof(val
)*2+1];
304 struct prom_t
*_prom
= &RELOC(prom
);
306 for (i
= nibbles
-1; i
>= 0; i
--) {
307 buf
[i
] = (val
& 0xf) + '0';
309 buf
[i
] += ('a'-'0'-10);
313 call_prom("write", 3, 1, _prom
->stdout
, buf
, nibbles
);
317 static void __init
prom_printf(const char *format
, ...)
319 const char *p
, *q
, *s
;
322 struct prom_t
*_prom
= &RELOC(prom
);
324 va_start(args
, format
);
326 format
= PTRRELOC(format
);
328 for (p
= format
; *p
!= 0; p
= q
) {
329 for (q
= p
; *q
!= 0 && *q
!= '\n' && *q
!= '%'; ++q
)
332 call_prom("write", 3, 1, _prom
->stdout
, p
, q
- p
);
337 call_prom("write", 3, 1, _prom
->stdout
,
347 s
= va_arg(args
, const char *);
352 v
= va_arg(args
, unsigned long);
360 static unsigned int __init
prom_claim(unsigned long virt
, unsigned long size
,
364 struct prom_t
*_prom
= &RELOC(prom
);
366 ret
= call_prom("claim", 3, 1, (prom_arg_t
)virt
, (prom_arg_t
)size
,
368 if (ret
!= -1 && _prom
->mmumap
!= 0)
369 /* old pmacs need us to map as well */
370 call_prom("call-method", 6, 1,
371 ADDR("map"), _prom
->mmumap
, 0, size
, virt
, virt
);
375 static void __init
__attribute__((noreturn
)) prom_panic(const char *reason
)
378 reason
= PTRRELOC(reason
);
381 /* ToDo: should put up an SRC here on p/iSeries */
382 call_prom("exit", 0, 0);
384 for (;;) /* should never get here */
389 static int __init
prom_next_node(phandle
*nodep
)
393 if ((node
= *nodep
) != 0
394 && (*nodep
= call_prom("child", 1, 1, node
)) != 0)
396 if ((*nodep
= call_prom("peer", 1, 1, node
)) != 0)
399 if ((node
= call_prom("parent", 1, 1, node
)) == 0)
401 if ((*nodep
= call_prom("peer", 1, 1, node
)) != 0)
406 static int inline prom_getprop(phandle node
, const char *pname
,
407 void *value
, size_t valuelen
)
409 return call_prom("getprop", 4, 1, node
, ADDR(pname
),
410 (u32
)(unsigned long) value
, (u32
) valuelen
);
413 static int inline prom_getproplen(phandle node
, const char *pname
)
415 return call_prom("getproplen", 2, 1, node
, ADDR(pname
));
418 static int inline prom_setprop(phandle node
, const char *pname
,
419 void *value
, size_t valuelen
)
421 return call_prom("setprop", 4, 1, node
, ADDR(pname
),
422 (u32
)(unsigned long) value
, (u32
) valuelen
);
425 /* We can't use the standard versions because of RELOC headaches. */
426 #define isxdigit(c) (('0' <= (c) && (c) <= '9') \
427 || ('a' <= (c) && (c) <= 'f') \
428 || ('A' <= (c) && (c) <= 'F'))
430 #define isdigit(c) ('0' <= (c) && (c) <= '9')
431 #define islower(c) ('a' <= (c) && (c) <= 'z')
432 #define toupper(c) (islower(c) ? ((c) - 'a' + 'A') : (c))
434 unsigned long prom_strtoul(const char *cp
, const char **endp
)
436 unsigned long result
= 0, base
= 10, value
;
441 if (toupper(*cp
) == 'X') {
447 while (isxdigit(*cp
) &&
448 (value
= isdigit(*cp
) ? *cp
- '0' : toupper(*cp
) - 'A' + 10) < base
) {
449 result
= result
* base
+ value
;
459 unsigned long prom_memparse(const char *ptr
, const char **retptr
)
461 unsigned long ret
= prom_strtoul(ptr
, retptr
);
465 * We can't use a switch here because GCC *may* generate a
466 * jump table which won't work, because we're not running at
467 * the address we're linked at.
469 if ('G' == **retptr
|| 'g' == **retptr
)
472 if ('M' == **retptr
|| 'm' == **retptr
)
475 if ('K' == **retptr
|| 'k' == **retptr
)
487 * Early parsing of the command line passed to the kernel, used for
488 * "mem=x" and the options that affect the iommu
490 static void __init
early_cmdline_parse(void)
492 struct prom_t
*_prom
= &RELOC(prom
);
496 RELOC(prom_cmd_line
[0]) = 0;
497 p
= RELOC(prom_cmd_line
);
498 if ((long)_prom
->chosen
> 0)
499 l
= prom_getprop(_prom
->chosen
, "bootargs", p
, COMMAND_LINE_SIZE
-1);
500 #ifdef CONFIG_CMDLINE
501 if (l
== 0) /* dbl check */
502 strlcpy(RELOC(prom_cmd_line
),
503 RELOC(CONFIG_CMDLINE
), sizeof(prom_cmd_line
));
504 #endif /* CONFIG_CMDLINE */
505 prom_printf("command line: %s\n", RELOC(prom_cmd_line
));
508 opt
= strstr(RELOC(prom_cmd_line
), RELOC("iommu="));
510 prom_printf("iommu opt is: %s\n", opt
);
512 while (*opt
&& *opt
== ' ')
514 if (!strncmp(opt
, RELOC("off"), 3))
515 RELOC(ppc64_iommu_off
) = 1;
516 else if (!strncmp(opt
, RELOC("force"), 5))
517 RELOC(iommu_force_on
) = 1;
521 opt
= strstr(RELOC(prom_cmd_line
), RELOC("mem="));
524 RELOC(prom_memory_limit
) = prom_memparse(opt
, (const char **)&opt
);
526 /* Align to 16 MB == size of ppc64 large page */
527 RELOC(prom_memory_limit
) = ALIGN(RELOC(prom_memory_limit
), 0x1000000);
532 #ifdef CONFIG_PPC_PSERIES
534 * To tell the firmware what our capabilities are, we have to pass
535 * it a fake 32-bit ELF header containing a couple of PT_NOTE sections
536 * that contain structures that contain the actual values.
538 static struct fake_elf
{
545 char name
[8]; /* "PowerPC" */
559 char name
[24]; /* "IBM,RPA-Client-Config" */
573 .e_ident
= { 0x7f, 'E', 'L', 'F',
574 ELFCLASS32
, ELFDATA2MSB
, EV_CURRENT
},
575 .e_type
= ET_EXEC
, /* yeah right */
577 .e_version
= EV_CURRENT
,
578 .e_phoff
= offsetof(struct fake_elf
, phdr
),
579 .e_phentsize
= sizeof(Elf32_Phdr
),
585 .p_offset
= offsetof(struct fake_elf
, chrpnote
),
586 .p_filesz
= sizeof(struct chrpnote
)
589 .p_offset
= offsetof(struct fake_elf
, rpanote
),
590 .p_filesz
= sizeof(struct rpanote
)
594 .namesz
= sizeof("PowerPC"),
595 .descsz
= sizeof(struct chrpdesc
),
599 .real_mode
= ~0U, /* ~0 means "don't care" */
608 .namesz
= sizeof("IBM,RPA-Client-Config"),
609 .descsz
= sizeof(struct rpadesc
),
611 .name
= "IBM,RPA-Client-Config",
614 .min_rmo_size
= 64, /* in megabytes */
615 .min_rmo_percent
= 0,
616 .max_pft_size
= 48, /* 2^48 bytes max PFT size */
624 static void __init
prom_send_capabilities(void)
628 elfloader
= call_prom("open", 1, 1, ADDR("/packages/elf-loader"));
629 if (elfloader
== 0) {
630 prom_printf("couldn't open /packages/elf-loader\n");
633 call_prom("call-method", 3, 1, ADDR("process-elf-header"),
634 elfloader
, ADDR(&fake_elf
));
635 call_prom("close", 1, 0, elfloader
);
640 * Memory allocation strategy... our layout is normally:
642 * at 14Mb or more we have vmlinux, then a gap and initrd. In some
643 * rare cases, initrd might end up being before the kernel though.
644 * We assume this won't override the final kernel at 0, we have no
645 * provision to handle that in this version, but it should hopefully
648 * alloc_top is set to the top of RMO, eventually shrink down if the
651 * alloc_bottom is set to the top of kernel/initrd
653 * from there, allocations are done this way : rtas is allocated
654 * topmost, and the device-tree is allocated from the bottom. We try
655 * to grow the device-tree allocation as we progress. If we can't,
656 * then we fail, we don't currently have a facility to restart
657 * elsewhere, but that shouldn't be necessary.
659 * Note that calls to reserve_mem have to be done explicitly, memory
660 * allocated with either alloc_up or alloc_down isn't automatically
666 * Allocates memory in the RMO upward from the kernel/initrd
668 * When align is 0, this is a special case, it means to allocate in place
669 * at the current location of alloc_bottom or fail (that is basically
670 * extending the previous allocation). Used for the device-tree flattening
672 static unsigned long __init
alloc_up(unsigned long size
, unsigned long align
)
674 unsigned long base
= RELOC(alloc_bottom
);
675 unsigned long addr
= 0;
678 base
= _ALIGN_UP(base
, align
);
679 prom_debug("alloc_up(%x, %x)\n", size
, align
);
680 if (RELOC(ram_top
) == 0)
681 prom_panic("alloc_up() called with mem not initialized\n");
684 base
= _ALIGN_UP(RELOC(alloc_bottom
), align
);
686 base
= RELOC(alloc_bottom
);
688 for(; (base
+ size
) <= RELOC(alloc_top
);
689 base
= _ALIGN_UP(base
+ 0x100000, align
)) {
690 prom_debug(" trying: 0x%x\n\r", base
);
691 addr
= (unsigned long)prom_claim(base
, size
, 0);
692 if (addr
!= PROM_ERROR
&& addr
!= 0)
700 RELOC(alloc_bottom
) = addr
;
702 prom_debug(" -> %x\n", addr
);
703 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom
));
704 prom_debug(" alloc_top : %x\n", RELOC(alloc_top
));
705 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high
));
706 prom_debug(" rmo_top : %x\n", RELOC(rmo_top
));
707 prom_debug(" ram_top : %x\n", RELOC(ram_top
));
713 * Allocates memory downward, either from top of RMO, or if highmem
714 * is set, from the top of RAM. Note that this one doesn't handle
715 * failures. It does claim memory if highmem is not set.
717 static unsigned long __init
alloc_down(unsigned long size
, unsigned long align
,
720 unsigned long base
, addr
= 0;
722 prom_debug("alloc_down(%x, %x, %s)\n", size
, align
,
723 highmem
? RELOC("(high)") : RELOC("(low)"));
724 if (RELOC(ram_top
) == 0)
725 prom_panic("alloc_down() called with mem not initialized\n");
728 /* Carve out storage for the TCE table. */
729 addr
= _ALIGN_DOWN(RELOC(alloc_top_high
) - size
, align
);
730 if (addr
<= RELOC(alloc_bottom
))
732 /* Will we bump into the RMO ? If yes, check out that we
733 * didn't overlap existing allocations there, if we did,
734 * we are dead, we must be the first in town !
736 if (addr
< RELOC(rmo_top
)) {
737 /* Good, we are first */
738 if (RELOC(alloc_top
) == RELOC(rmo_top
))
739 RELOC(alloc_top
) = RELOC(rmo_top
) = addr
;
743 RELOC(alloc_top_high
) = addr
;
747 base
= _ALIGN_DOWN(RELOC(alloc_top
) - size
, align
);
748 for (; base
> RELOC(alloc_bottom
);
749 base
= _ALIGN_DOWN(base
- 0x100000, align
)) {
750 prom_debug(" trying: 0x%x\n\r", base
);
751 addr
= (unsigned long)prom_claim(base
, size
, 0);
752 if (addr
!= PROM_ERROR
&& addr
!= 0)
758 RELOC(alloc_top
) = addr
;
761 prom_debug(" -> %x\n", addr
);
762 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom
));
763 prom_debug(" alloc_top : %x\n", RELOC(alloc_top
));
764 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high
));
765 prom_debug(" rmo_top : %x\n", RELOC(rmo_top
));
766 prom_debug(" ram_top : %x\n", RELOC(ram_top
));
774 static unsigned long __init
prom_next_cell(int s
, cell_t
**cellp
)
779 /* Ignore more than 2 cells */
780 while (s
> sizeof(unsigned long) / 4) {
796 * Very dumb function for adding to the memory reserve list, but
797 * we don't need anything smarter at this point
799 * XXX Eventually check for collisions. They should NEVER happen.
800 * If problems seem to show up, it would be a good start to track
803 static void reserve_mem(unsigned long base
, unsigned long size
)
805 unsigned long top
= base
+ size
;
806 unsigned long cnt
= RELOC(mem_reserve_cnt
);
811 /* We need to always keep one empty entry so that we
812 * have our terminator with "size" set to 0 since we are
813 * dumb and just copy this entire array to the boot params
815 base
= _ALIGN_DOWN(base
, PAGE_SIZE
);
816 top
= _ALIGN_UP(top
, PAGE_SIZE
);
819 if (cnt
>= (MEM_RESERVE_MAP_SIZE
- 1))
820 prom_panic("Memory reserve map exhausted !\n");
821 RELOC(mem_reserve_map
)[cnt
].base
= base
;
822 RELOC(mem_reserve_map
)[cnt
].size
= size
;
823 RELOC(mem_reserve_cnt
) = cnt
+ 1;
827 * Initialize memory allocation mecanism, parse "memory" nodes and
828 * obtain that way the top of memory and RMO to setup out local allocator
830 static void __init
prom_init_mem(void)
833 char *path
, type
[64];
836 struct prom_t
*_prom
= &RELOC(prom
);
840 * We iterate the memory nodes to find
841 * 1) top of RMO (first node)
845 prom_getprop(_prom
->root
, "#address-cells", &rac
, sizeof(rac
));
847 prom_getprop(_prom
->root
, "#size-cells", &rsc
, sizeof(rsc
));
848 prom_debug("root_addr_cells: %x\n", (unsigned long) rac
);
849 prom_debug("root_size_cells: %x\n", (unsigned long) rsc
);
851 prom_debug("scanning memory:\n");
852 path
= RELOC(prom_scratch
);
854 for (node
= 0; prom_next_node(&node
); ) {
856 prom_getprop(node
, "device_type", type
, sizeof(type
));
860 * CHRP Longtrail machines have no device_type
861 * on the memory node, so check the name instead...
863 prom_getprop(node
, "name", type
, sizeof(type
));
865 if (strcmp(type
, RELOC("memory")))
868 plen
= prom_getprop(node
, "reg", RELOC(regbuf
), sizeof(regbuf
));
869 if (plen
> sizeof(regbuf
)) {
870 prom_printf("memory node too large for buffer !\n");
871 plen
= sizeof(regbuf
);
874 endp
= p
+ (plen
/ sizeof(cell_t
));
877 memset(path
, 0, PROM_SCRATCH_SIZE
);
878 call_prom("package-to-path", 3, 1, node
, path
, PROM_SCRATCH_SIZE
-1);
879 prom_debug(" node %s :\n", path
);
880 #endif /* DEBUG_PROM */
882 while ((endp
- p
) >= (rac
+ rsc
)) {
883 unsigned long base
, size
;
885 base
= prom_next_cell(rac
, &p
);
886 size
= prom_next_cell(rsc
, &p
);
890 prom_debug(" %x %x\n", base
, size
);
892 RELOC(rmo_top
) = size
;
893 if ((base
+ size
) > RELOC(ram_top
))
894 RELOC(ram_top
) = base
+ size
;
898 RELOC(alloc_bottom
) = PAGE_ALIGN((unsigned long)&RELOC(_end
) + 0x4000);
900 /* Check if we have an initrd after the kernel, if we do move our bottom
903 if (RELOC(prom_initrd_start
)) {
904 if (RELOC(prom_initrd_end
) > RELOC(alloc_bottom
))
905 RELOC(alloc_bottom
) = PAGE_ALIGN(RELOC(prom_initrd_end
));
909 * If prom_memory_limit is set we reduce the upper limits *except* for
910 * alloc_top_high. This must be the real top of RAM so we can put
914 RELOC(alloc_top_high
) = RELOC(ram_top
);
916 if (RELOC(prom_memory_limit
)) {
917 if (RELOC(prom_memory_limit
) <= RELOC(alloc_bottom
)) {
918 prom_printf("Ignoring mem=%x <= alloc_bottom.\n",
919 RELOC(prom_memory_limit
));
920 RELOC(prom_memory_limit
) = 0;
921 } else if (RELOC(prom_memory_limit
) >= RELOC(ram_top
)) {
922 prom_printf("Ignoring mem=%x >= ram_top.\n",
923 RELOC(prom_memory_limit
));
924 RELOC(prom_memory_limit
) = 0;
926 RELOC(ram_top
) = RELOC(prom_memory_limit
);
927 RELOC(rmo_top
) = min(RELOC(rmo_top
), RELOC(prom_memory_limit
));
932 * Setup our top alloc point, that is top of RMO or top of
933 * segment 0 when running non-LPAR.
934 * Some RS64 machines have buggy firmware where claims up at
935 * 1GB fail. Cap at 768MB as a workaround.
936 * Since 768MB is plenty of room, and we need to cap to something
937 * reasonable on 32-bit, cap at 768MB on all machines.
940 RELOC(rmo_top
) = RELOC(ram_top
);
941 RELOC(rmo_top
) = min(0x30000000ul
, RELOC(rmo_top
));
942 RELOC(alloc_top
) = RELOC(rmo_top
);
944 prom_printf("memory layout at init:\n");
945 prom_printf(" memory_limit : %x (16 MB aligned)\n", RELOC(prom_memory_limit
));
946 prom_printf(" alloc_bottom : %x\n", RELOC(alloc_bottom
));
947 prom_printf(" alloc_top : %x\n", RELOC(alloc_top
));
948 prom_printf(" alloc_top_hi : %x\n", RELOC(alloc_top_high
));
949 prom_printf(" rmo_top : %x\n", RELOC(rmo_top
));
950 prom_printf(" ram_top : %x\n", RELOC(ram_top
));
955 * Allocate room for and instantiate RTAS
957 static void __init
prom_instantiate_rtas(void)
964 prom_debug("prom_instantiate_rtas: start...\n");
966 rtas_node
= call_prom("finddevice", 1, 1, ADDR("/rtas"));
967 prom_debug("rtas_node: %x\n", rtas_node
);
968 if (!PHANDLE_VALID(rtas_node
))
971 prom_getprop(rtas_node
, "rtas-size", &size
, sizeof(size
));
975 base
= alloc_down(size
, PAGE_SIZE
, 0);
977 prom_printf("RTAS allocation failed !\n");
981 rtas_inst
= call_prom("open", 1, 1, ADDR("/rtas"));
982 if (!IHANDLE_VALID(rtas_inst
)) {
983 prom_printf("opening rtas package failed");
987 prom_printf("instantiating rtas at 0x%x ...", base
);
989 if (call_prom_ret("call-method", 3, 2, &entry
,
990 ADDR("instantiate-rtas"),
991 rtas_inst
, base
) == PROM_ERROR
993 prom_printf(" failed\n");
996 prom_printf(" done\n");
998 reserve_mem(base
, size
);
1000 prom_setprop(rtas_node
, "linux,rtas-base", &base
, sizeof(base
));
1001 prom_setprop(rtas_node
, "linux,rtas-entry", &entry
, sizeof(entry
));
1003 prom_debug("rtas base = 0x%x\n", base
);
1004 prom_debug("rtas entry = 0x%x\n", entry
);
1005 prom_debug("rtas size = 0x%x\n", (long)size
);
1007 prom_debug("prom_instantiate_rtas: end...\n");
1012 * Allocate room for and initialize TCE tables
1014 static void __init
prom_initialize_tce_table(void)
1018 char compatible
[64], type
[64], model
[64];
1019 char *path
= RELOC(prom_scratch
);
1021 u32 minalign
, minsize
;
1022 u64 tce_entry
, *tce_entryp
;
1023 u64 local_alloc_top
, local_alloc_bottom
;
1026 if (RELOC(ppc64_iommu_off
))
1029 prom_debug("starting prom_initialize_tce_table\n");
1031 /* Cache current top of allocs so we reserve a single block */
1032 local_alloc_top
= RELOC(alloc_top_high
);
1033 local_alloc_bottom
= local_alloc_top
;
1035 /* Search all nodes looking for PHBs. */
1036 for (node
= 0; prom_next_node(&node
); ) {
1040 prom_getprop(node
, "compatible",
1041 compatible
, sizeof(compatible
));
1042 prom_getprop(node
, "device_type", type
, sizeof(type
));
1043 prom_getprop(node
, "model", model
, sizeof(model
));
1045 if ((type
[0] == 0) || (strstr(type
, RELOC("pci")) == NULL
))
1048 /* Keep the old logic in tack to avoid regression. */
1049 if (compatible
[0] != 0) {
1050 if ((strstr(compatible
, RELOC("python")) == NULL
) &&
1051 (strstr(compatible
, RELOC("Speedwagon")) == NULL
) &&
1052 (strstr(compatible
, RELOC("Winnipeg")) == NULL
))
1054 } else if (model
[0] != 0) {
1055 if ((strstr(model
, RELOC("ython")) == NULL
) &&
1056 (strstr(model
, RELOC("peedwagon")) == NULL
) &&
1057 (strstr(model
, RELOC("innipeg")) == NULL
))
1061 if (prom_getprop(node
, "tce-table-minalign", &minalign
,
1062 sizeof(minalign
)) == PROM_ERROR
)
1064 if (prom_getprop(node
, "tce-table-minsize", &minsize
,
1065 sizeof(minsize
)) == PROM_ERROR
)
1066 minsize
= 4UL << 20;
1069 * Even though we read what OF wants, we just set the table
1070 * size to 4 MB. This is enough to map 2GB of PCI DMA space.
1071 * By doing this, we avoid the pitfalls of trying to DMA to
1072 * MMIO space and the DMA alias hole.
1074 * On POWER4, firmware sets the TCE region by assuming
1075 * each TCE table is 8MB. Using this memory for anything
1076 * else will impact performance, so we always allocate 8MB.
1079 if (__is_processor(PV_POWER4
) || __is_processor(PV_POWER4p
))
1080 minsize
= 8UL << 20;
1082 minsize
= 4UL << 20;
1084 /* Align to the greater of the align or size */
1085 align
= max(minalign
, minsize
);
1086 base
= alloc_down(minsize
, align
, 1);
1088 prom_panic("ERROR, cannot find space for TCE table.\n");
1089 if (base
< local_alloc_bottom
)
1090 local_alloc_bottom
= base
;
1092 /* Save away the TCE table attributes for later use. */
1093 prom_setprop(node
, "linux,tce-base", &base
, sizeof(base
));
1094 prom_setprop(node
, "linux,tce-size", &minsize
, sizeof(minsize
));
1096 /* It seems OF doesn't null-terminate the path :-( */
1097 memset(path
, 0, sizeof(path
));
1098 /* Call OF to setup the TCE hardware */
1099 if (call_prom("package-to-path", 3, 1, node
,
1100 path
, PROM_SCRATCH_SIZE
-1) == PROM_ERROR
) {
1101 prom_printf("package-to-path failed\n");
1104 prom_debug("TCE table: %s\n", path
);
1105 prom_debug("\tnode = 0x%x\n", node
);
1106 prom_debug("\tbase = 0x%x\n", base
);
1107 prom_debug("\tsize = 0x%x\n", minsize
);
1109 /* Initialize the table to have a one-to-one mapping
1110 * over the allocated size.
1112 tce_entryp
= (unsigned long *)base
;
1113 for (i
= 0; i
< (minsize
>> 3) ;tce_entryp
++, i
++) {
1114 tce_entry
= (i
<< PAGE_SHIFT
);
1116 *tce_entryp
= tce_entry
;
1119 prom_printf("opening PHB %s", path
);
1120 phb_node
= call_prom("open", 1, 1, path
);
1122 prom_printf("... failed\n");
1124 prom_printf("... done\n");
1126 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
1127 phb_node
, -1, minsize
,
1128 (u32
) base
, (u32
) (base
>> 32));
1129 call_prom("close", 1, 0, phb_node
);
1132 reserve_mem(local_alloc_bottom
, local_alloc_top
- local_alloc_bottom
);
1134 if (RELOC(prom_memory_limit
)) {
1136 * We align the start to a 16MB boundary so we can map
1137 * the TCE area using large pages if possible.
1138 * The end should be the top of RAM so no need to align it.
1140 RELOC(prom_tce_alloc_start
) = _ALIGN_DOWN(local_alloc_bottom
,
1142 RELOC(prom_tce_alloc_end
) = local_alloc_top
;
1145 /* Flag the first invalid entry */
1146 prom_debug("ending prom_initialize_tce_table\n");
1151 * With CHRP SMP we need to use the OF to start the other processors.
1152 * We can't wait until smp_boot_cpus (the OF is trashed by then)
1153 * so we have to put the processors into a holding pattern controlled
1154 * by the kernel (not OF) before we destroy the OF.
1156 * This uses a chunk of low memory, puts some holding pattern
1157 * code there and sends the other processors off to there until
1158 * smp_boot_cpus tells them to do something. The holding pattern
1159 * checks that address until its cpu # is there, when it is that
1160 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care
1161 * of setting those values.
1163 * We also use physical address 0x4 here to tell when a cpu
1164 * is in its holding pattern code.
1168 extern void __secondary_hold(void);
1169 extern unsigned long __secondary_hold_spinloop
;
1170 extern unsigned long __secondary_hold_acknowledge
;
1173 * We want to reference the copy of __secondary_hold_* in the
1174 * 0 - 0x100 address range
1176 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff)
1178 static void __init
prom_hold_cpus(void)
1185 unsigned int interrupt_server
[MAX_CPU_THREADS
];
1186 unsigned int cpu_threads
, hw_cpu_num
;
1188 struct prom_t
*_prom
= &RELOC(prom
);
1189 unsigned long *spinloop
1190 = (void *) LOW_ADDR(__secondary_hold_spinloop
);
1191 unsigned long *acknowledge
1192 = (void *) LOW_ADDR(__secondary_hold_acknowledge
);
1194 /* __secondary_hold is actually a descriptor, not the text address */
1195 unsigned long secondary_hold
1196 = __pa(*PTRRELOC((unsigned long *)__secondary_hold
));
1198 unsigned long secondary_hold
= LOW_ADDR(__secondary_hold
);
1201 prom_debug("prom_hold_cpus: start...\n");
1202 prom_debug(" 1) spinloop = 0x%x\n", (unsigned long)spinloop
);
1203 prom_debug(" 1) *spinloop = 0x%x\n", *spinloop
);
1204 prom_debug(" 1) acknowledge = 0x%x\n",
1205 (unsigned long)acknowledge
);
1206 prom_debug(" 1) *acknowledge = 0x%x\n", *acknowledge
);
1207 prom_debug(" 1) secondary_hold = 0x%x\n", secondary_hold
);
1209 /* Set the common spinloop variable, so all of the secondary cpus
1210 * will block when they are awakened from their OF spinloop.
1211 * This must occur for both SMP and non SMP kernels, since OF will
1212 * be trashed when we move the kernel.
1217 for (i
= 0; i
< NR_CPUS
; i
++)
1218 RELOC(hmt_thread_data
)[i
].pir
= 0xdeadbeef;
1221 for (node
= 0; prom_next_node(&node
); ) {
1223 prom_getprop(node
, "device_type", type
, sizeof(type
));
1224 if (strcmp(type
, RELOC("cpu")) != 0)
1227 /* Skip non-configured cpus. */
1228 if (prom_getprop(node
, "status", type
, sizeof(type
)) > 0)
1229 if (strcmp(type
, RELOC("okay")) != 0)
1233 prom_getprop(node
, "reg", ®
, sizeof(reg
));
1235 prom_debug("\ncpuid = 0x%x\n", cpuid
);
1236 prom_debug("cpu hw idx = 0x%x\n", reg
);
1238 /* Init the acknowledge var which will be reset by
1239 * the secondary cpu when it awakens from its OF
1242 *acknowledge
= (unsigned long)-1;
1244 propsize
= prom_getprop(node
, "ibm,ppc-interrupt-server#s",
1246 sizeof(interrupt_server
));
1248 /* no property. old hardware has no SMT */
1250 interrupt_server
[0] = reg
; /* fake it with phys id */
1252 /* We have a threaded processor */
1253 cpu_threads
= propsize
/ sizeof(u32
);
1254 if (cpu_threads
> MAX_CPU_THREADS
) {
1255 prom_printf("SMT: too many threads!\n"
1256 "SMT: found %x, max is %x\n",
1257 cpu_threads
, MAX_CPU_THREADS
);
1258 cpu_threads
= 1; /* ToDo: panic? */
1262 hw_cpu_num
= interrupt_server
[0];
1263 if (hw_cpu_num
!= _prom
->cpu
) {
1264 /* Primary Thread of non-boot cpu */
1265 prom_printf("%x : starting cpu hw idx %x... ", cpuid
, reg
);
1266 call_prom("start-cpu", 3, 0, node
,
1267 secondary_hold
, reg
);
1269 for (i
= 0; (i
< 100000000) &&
1270 (*acknowledge
== ((unsigned long)-1)); i
++ )
1273 if (*acknowledge
== reg
)
1274 prom_printf("done\n");
1276 prom_printf("failed: %x\n", *acknowledge
);
1280 prom_printf("%x : boot cpu %x\n", cpuid
, reg
);
1281 #endif /* CONFIG_SMP */
1283 /* Reserve cpu #s for secondary threads. They start later. */
1284 cpuid
+= cpu_threads
;
1287 /* Only enable HMT on processors that provide support. */
1288 if (__is_processor(PV_PULSAR
) ||
1289 __is_processor(PV_ICESTAR
) ||
1290 __is_processor(PV_SSTAR
)) {
1291 prom_printf(" starting secondary threads\n");
1293 for (i
= 0; i
< NR_CPUS
; i
+= 2) {
1298 unsigned long pir
= mfspr(SPRN_PIR
);
1299 if (__is_processor(PV_PULSAR
)) {
1300 RELOC(hmt_thread_data
)[i
].pir
=
1303 RELOC(hmt_thread_data
)[i
].pir
=
1309 prom_printf("Processor is not HMT capable\n");
1313 if (cpuid
> NR_CPUS
)
1314 prom_printf("WARNING: maximum CPUs (" __stringify(NR_CPUS
)
1315 ") exceeded: ignoring extras\n");
1317 prom_debug("prom_hold_cpus: end...\n");
1321 static void __init
prom_init_client_services(unsigned long pp
)
1323 struct prom_t
*_prom
= &RELOC(prom
);
1325 /* Get a handle to the prom entry point before anything else */
1326 RELOC(prom_entry
) = pp
;
1328 /* get a handle for the stdout device */
1329 _prom
->chosen
= call_prom("finddevice", 1, 1, ADDR("/chosen"));
1330 if (!PHANDLE_VALID(_prom
->chosen
))
1331 prom_panic("cannot find chosen"); /* msg won't be printed :( */
1333 /* get device tree root */
1334 _prom
->root
= call_prom("finddevice", 1, 1, ADDR("/"));
1335 if (!PHANDLE_VALID(_prom
->root
))
1336 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
1343 * For really old powermacs, we need to map things we claim.
1344 * For that, we need the ihandle of the mmu.
1346 static void __init
prom_find_mmu(void)
1348 struct prom_t
*_prom
= &RELOC(prom
);
1352 oprom
= call_prom("finddevice", 1, 1, ADDR("/openprom"));
1353 if (!PHANDLE_VALID(oprom
))
1355 if (prom_getprop(oprom
, "model", version
, sizeof(version
)) <= 0)
1357 version
[sizeof(version
) - 1] = 0;
1358 prom_printf("OF version is '%s'\n", version
);
1359 /* XXX might need to add other versions here */
1360 if (strcmp(version
, "Open Firmware, 1.0.5") != 0)
1362 prom_getprop(_prom
->chosen
, "mmu", &_prom
->mmumap
,
1363 sizeof(_prom
->mmumap
));
1366 #define prom_find_mmu()
1369 static void __init
prom_init_stdout(void)
1371 struct prom_t
*_prom
= &RELOC(prom
);
1372 char *path
= RELOC(of_stdout_device
);
1376 if (prom_getprop(_prom
->chosen
, "stdout", &val
, sizeof(val
)) <= 0)
1377 prom_panic("cannot find stdout");
1379 _prom
->stdout
= val
;
1381 /* Get the full OF pathname of the stdout device */
1382 memset(path
, 0, 256);
1383 call_prom("instance-to-path", 3, 1, _prom
->stdout
, path
, 255);
1384 val
= call_prom("instance-to-package", 1, 1, _prom
->stdout
);
1385 prom_setprop(_prom
->chosen
, "linux,stdout-package", &val
, sizeof(val
));
1386 prom_printf("OF stdout device is: %s\n", RELOC(of_stdout_device
));
1387 prom_setprop(_prom
->chosen
, "linux,stdout-path",
1388 RELOC(of_stdout_device
), strlen(RELOC(of_stdout_device
))+1);
1390 /* If it's a display, note it */
1391 memset(type
, 0, sizeof(type
));
1392 prom_getprop(val
, "device_type", type
, sizeof(type
));
1393 if (strcmp(type
, RELOC("display")) == 0)
1394 prom_setprop(val
, "linux,boot-display", NULL
, 0);
1397 static void __init
prom_close_stdin(void)
1399 struct prom_t
*_prom
= &RELOC(prom
);
1402 if (prom_getprop(_prom
->chosen
, "stdin", &val
, sizeof(val
)) > 0)
1403 call_prom("close", 1, 0, val
);
1406 static int __init
prom_find_machine_type(void)
1408 struct prom_t
*_prom
= &RELOC(prom
);
1414 len
= prom_getprop(_prom
->root
, "compatible",
1415 compat
, sizeof(compat
)-1);
1419 char *p
= &compat
[i
];
1423 if (strstr(p
, RELOC("Power Macintosh")) ||
1424 strstr(p
, RELOC("MacRISC")))
1425 return PLATFORM_POWERMAC
;
1427 if (strstr(p
, RELOC("Momentum,Maple")))
1428 return PLATFORM_MAPLE
;
1434 /* Default to pSeries. We need to know if we are running LPAR */
1435 rtas
= call_prom("finddevice", 1, 1, ADDR("/rtas"));
1436 if (PHANDLE_VALID(rtas
)) {
1437 int x
= prom_getproplen(rtas
, "ibm,hypertas-functions");
1438 if (x
!= PROM_ERROR
) {
1439 prom_printf("Hypertas detected, assuming LPAR !\n");
1440 return PLATFORM_PSERIES_LPAR
;
1443 return PLATFORM_PSERIES
;
1445 return PLATFORM_CHRP
;
1449 static int __init
prom_set_color(ihandle ih
, int i
, int r
, int g
, int b
)
1451 return call_prom("call-method", 6, 1, ADDR("color!"), ih
, i
, b
, g
, r
);
1455 * If we have a display that we don't know how to drive,
1456 * we will want to try to execute OF's open method for it
1457 * later. However, OF will probably fall over if we do that
1458 * we've taken over the MMU.
1459 * So we check whether we will need to open the display,
1460 * and if so, open it now.
1462 static void __init
prom_check_displays(void)
1464 char type
[16], *path
;
1469 static unsigned char default_colors
[] = {
1487 const unsigned char *clut
;
1489 prom_printf("Looking for displays\n");
1490 for (node
= 0; prom_next_node(&node
); ) {
1491 memset(type
, 0, sizeof(type
));
1492 prom_getprop(node
, "device_type", type
, sizeof(type
));
1493 if (strcmp(type
, RELOC("display")) != 0)
1496 /* It seems OF doesn't null-terminate the path :-( */
1497 path
= RELOC(prom_scratch
);
1498 memset(path
, 0, PROM_SCRATCH_SIZE
);
1501 * leave some room at the end of the path for appending extra
1504 if (call_prom("package-to-path", 3, 1, node
, path
,
1505 PROM_SCRATCH_SIZE
-10) == PROM_ERROR
)
1507 prom_printf("found display : %s, opening ... ", path
);
1509 ih
= call_prom("open", 1, 1, path
);
1511 prom_printf("failed\n");
1516 prom_printf("done\n");
1517 prom_setprop(node
, "linux,opened", NULL
, 0);
1519 /* Setup a usable color table when the appropriate
1520 * method is available. Should update this to set-colors */
1521 clut
= RELOC(default_colors
);
1522 for (i
= 0; i
< 32; i
++, clut
+= 3)
1523 if (prom_set_color(ih
, i
, clut
[0], clut
[1],
1527 #ifdef CONFIG_LOGO_LINUX_CLUT224
1528 clut
= PTRRELOC(RELOC(logo_linux_clut224
.clut
));
1529 for (i
= 0; i
< RELOC(logo_linux_clut224
.clutsize
); i
++, clut
+= 3)
1530 if (prom_set_color(ih
, i
+ 32, clut
[0], clut
[1],
1533 #endif /* CONFIG_LOGO_LINUX_CLUT224 */
1538 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */
1539 static void __init
*make_room(unsigned long *mem_start
, unsigned long *mem_end
,
1540 unsigned long needed
, unsigned long align
)
1544 *mem_start
= _ALIGN(*mem_start
, align
);
1545 while ((*mem_start
+ needed
) > *mem_end
) {
1546 unsigned long room
, chunk
;
1548 prom_debug("Chunk exhausted, claiming more at %x...\n",
1549 RELOC(alloc_bottom
));
1550 room
= RELOC(alloc_top
) - RELOC(alloc_bottom
);
1551 if (room
> DEVTREE_CHUNK_SIZE
)
1552 room
= DEVTREE_CHUNK_SIZE
;
1553 if (room
< PAGE_SIZE
)
1554 prom_panic("No memory for flatten_device_tree (no room)");
1555 chunk
= alloc_up(room
, 0);
1557 prom_panic("No memory for flatten_device_tree (claim failed)");
1558 *mem_end
= RELOC(alloc_top
);
1561 ret
= (void *)*mem_start
;
1562 *mem_start
+= needed
;
1567 #define dt_push_token(token, mem_start, mem_end) \
1568 do { *((u32 *)make_room(mem_start, mem_end, 4, 4)) = token; } while(0)
1570 static unsigned long __init
dt_find_string(char *str
)
1574 s
= os
= (char *)RELOC(dt_string_start
);
1576 while (s
< (char *)RELOC(dt_string_end
)) {
1577 if (strcmp(s
, str
) == 0)
1585 * The Open Firmware 1275 specification states properties must be 31 bytes or
1586 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
1588 #define MAX_PROPERTY_NAME 64
1590 static void __init
scan_dt_build_strings(phandle node
,
1591 unsigned long *mem_start
,
1592 unsigned long *mem_end
)
1594 char *prev_name
, *namep
, *sstart
;
1598 sstart
= (char *)RELOC(dt_string_start
);
1600 /* get and store all property names */
1601 prev_name
= RELOC("");
1603 /* 64 is max len of name including nul. */
1604 namep
= make_room(mem_start
, mem_end
, MAX_PROPERTY_NAME
, 1);
1605 if (call_prom("nextprop", 3, 1, node
, prev_name
, namep
) != 1) {
1606 /* No more nodes: unwind alloc */
1607 *mem_start
= (unsigned long)namep
;
1612 if (strcmp(namep
, RELOC("name")) == 0) {
1613 *mem_start
= (unsigned long)namep
;
1614 prev_name
= RELOC("name");
1617 /* get/create string entry */
1618 soff
= dt_find_string(namep
);
1620 *mem_start
= (unsigned long)namep
;
1621 namep
= sstart
+ soff
;
1623 /* Trim off some if we can */
1624 *mem_start
= (unsigned long)namep
+ strlen(namep
) + 1;
1625 RELOC(dt_string_end
) = *mem_start
;
1630 /* do all our children */
1631 child
= call_prom("child", 1, 1, node
);
1632 while (child
!= 0) {
1633 scan_dt_build_strings(child
, mem_start
, mem_end
);
1634 child
= call_prom("peer", 1, 1, child
);
1638 static void __init
scan_dt_build_struct(phandle node
, unsigned long *mem_start
,
1639 unsigned long *mem_end
)
1642 char *namep
, *prev_name
, *sstart
, *p
, *ep
, *lp
, *path
;
1644 unsigned char *valp
;
1645 static char pname
[MAX_PROPERTY_NAME
];
1648 dt_push_token(OF_DT_BEGIN_NODE
, mem_start
, mem_end
);
1650 /* get the node's full name */
1651 namep
= (char *)*mem_start
;
1652 room
= *mem_end
- *mem_start
;
1655 l
= call_prom("package-to-path", 3, 1, node
, namep
, room
);
1657 /* Didn't fit? Get more room. */
1659 if (l
>= *mem_end
- *mem_start
)
1660 namep
= make_room(mem_start
, mem_end
, l
+1, 1);
1661 call_prom("package-to-path", 3, 1, node
, namep
, l
);
1665 /* Fixup an Apple bug where they have bogus \0 chars in the
1666 * middle of the path in some properties, and extract
1667 * the unit name (everything after the last '/').
1669 for (lp
= p
= namep
, ep
= namep
+ l
; p
< ep
; p
++) {
1676 *mem_start
= _ALIGN((unsigned long)lp
+ 1, 4);
1679 /* get it again for debugging */
1680 path
= RELOC(prom_scratch
);
1681 memset(path
, 0, PROM_SCRATCH_SIZE
);
1682 call_prom("package-to-path", 3, 1, node
, path
, PROM_SCRATCH_SIZE
-1);
1684 /* get and store all properties */
1685 prev_name
= RELOC("");
1686 sstart
= (char *)RELOC(dt_string_start
);
1688 if (call_prom("nextprop", 3, 1, node
, prev_name
,
1693 if (strcmp(RELOC(pname
), RELOC("name")) == 0) {
1694 prev_name
= RELOC("name");
1698 /* find string offset */
1699 soff
= dt_find_string(RELOC(pname
));
1701 prom_printf("WARNING: Can't find string index for"
1702 " <%s>, node %s\n", RELOC(pname
), path
);
1705 prev_name
= sstart
+ soff
;
1708 l
= call_prom("getproplen", 2, 1, node
, RELOC(pname
));
1711 if (l
== PROM_ERROR
)
1713 if (l
> MAX_PROPERTY_LENGTH
) {
1714 prom_printf("WARNING: ignoring large property ");
1715 /* It seems OF doesn't null-terminate the path :-( */
1716 prom_printf("[%s] ", path
);
1717 prom_printf("%s length 0x%x\n", RELOC(pname
), l
);
1721 /* push property head */
1722 dt_push_token(OF_DT_PROP
, mem_start
, mem_end
);
1723 dt_push_token(l
, mem_start
, mem_end
);
1724 dt_push_token(soff
, mem_start
, mem_end
);
1726 /* push property content */
1727 valp
= make_room(mem_start
, mem_end
, l
, 4);
1728 call_prom("getprop", 4, 1, node
, RELOC(pname
), valp
, l
);
1729 *mem_start
= _ALIGN(*mem_start
, 4);
1732 /* Add a "linux,phandle" property. */
1733 soff
= dt_find_string(RELOC("linux,phandle"));
1735 prom_printf("WARNING: Can't find string index for"
1736 " <linux-phandle> node %s\n", path
);
1738 dt_push_token(OF_DT_PROP
, mem_start
, mem_end
);
1739 dt_push_token(4, mem_start
, mem_end
);
1740 dt_push_token(soff
, mem_start
, mem_end
);
1741 valp
= make_room(mem_start
, mem_end
, 4, 4);
1742 *(u32
*)valp
= node
;
1745 /* do all our children */
1746 child
= call_prom("child", 1, 1, node
);
1747 while (child
!= 0) {
1748 scan_dt_build_struct(child
, mem_start
, mem_end
);
1749 child
= call_prom("peer", 1, 1, child
);
1752 dt_push_token(OF_DT_END_NODE
, mem_start
, mem_end
);
1755 static void __init
flatten_device_tree(void)
1758 unsigned long mem_start
, mem_end
, room
;
1759 struct boot_param_header
*hdr
;
1760 struct prom_t
*_prom
= &RELOC(prom
);
1765 * Check how much room we have between alloc top & bottom (+/- a
1766 * few pages), crop to 4Mb, as this is our "chuck" size
1768 room
= RELOC(alloc_top
) - RELOC(alloc_bottom
) - 0x4000;
1769 if (room
> DEVTREE_CHUNK_SIZE
)
1770 room
= DEVTREE_CHUNK_SIZE
;
1771 prom_debug("starting device tree allocs at %x\n", RELOC(alloc_bottom
));
1773 /* Now try to claim that */
1774 mem_start
= (unsigned long)alloc_up(room
, PAGE_SIZE
);
1776 prom_panic("Can't allocate initial device-tree chunk\n");
1777 mem_end
= RELOC(alloc_top
);
1779 /* Get root of tree */
1780 root
= call_prom("peer", 1, 1, (phandle
)0);
1781 if (root
== (phandle
)0)
1782 prom_panic ("couldn't get device tree root\n");
1784 /* Build header and make room for mem rsv map */
1785 mem_start
= _ALIGN(mem_start
, 4);
1786 hdr
= make_room(&mem_start
, &mem_end
,
1787 sizeof(struct boot_param_header
), 4);
1788 RELOC(dt_header_start
) = (unsigned long)hdr
;
1789 rsvmap
= make_room(&mem_start
, &mem_end
, sizeof(mem_reserve_map
), 8);
1791 /* Start of strings */
1792 mem_start
= PAGE_ALIGN(mem_start
);
1793 RELOC(dt_string_start
) = mem_start
;
1794 mem_start
+= 4; /* hole */
1796 /* Add "linux,phandle" in there, we'll need it */
1797 namep
= make_room(&mem_start
, &mem_end
, 16, 1);
1798 strcpy(namep
, RELOC("linux,phandle"));
1799 mem_start
= (unsigned long)namep
+ strlen(namep
) + 1;
1801 /* Build string array */
1802 prom_printf("Building dt strings...\n");
1803 scan_dt_build_strings(root
, &mem_start
, &mem_end
);
1804 RELOC(dt_string_end
) = mem_start
;
1806 /* Build structure */
1807 mem_start
= PAGE_ALIGN(mem_start
);
1808 RELOC(dt_struct_start
) = mem_start
;
1809 prom_printf("Building dt structure...\n");
1810 scan_dt_build_struct(root
, &mem_start
, &mem_end
);
1811 dt_push_token(OF_DT_END
, &mem_start
, &mem_end
);
1812 RELOC(dt_struct_end
) = PAGE_ALIGN(mem_start
);
1815 hdr
->boot_cpuid_phys
= _prom
->cpu
;
1816 hdr
->magic
= OF_DT_HEADER
;
1817 hdr
->totalsize
= RELOC(dt_struct_end
) - RELOC(dt_header_start
);
1818 hdr
->off_dt_struct
= RELOC(dt_struct_start
) - RELOC(dt_header_start
);
1819 hdr
->off_dt_strings
= RELOC(dt_string_start
) - RELOC(dt_header_start
);
1820 hdr
->dt_strings_size
= RELOC(dt_string_end
) - RELOC(dt_string_start
);
1821 hdr
->off_mem_rsvmap
= ((unsigned long)rsvmap
) - RELOC(dt_header_start
);
1822 hdr
->version
= OF_DT_VERSION
;
1823 /* Version 16 is not backward compatible */
1824 hdr
->last_comp_version
= 0x10;
1826 /* Reserve the whole thing and copy the reserve map in, we
1827 * also bump mem_reserve_cnt to cause further reservations to
1828 * fail since it's too late.
1830 reserve_mem(RELOC(dt_header_start
), hdr
->totalsize
);
1831 memcpy(rsvmap
, RELOC(mem_reserve_map
), sizeof(mem_reserve_map
));
1836 prom_printf("reserved memory map:\n");
1837 for (i
= 0; i
< RELOC(mem_reserve_cnt
); i
++)
1838 prom_printf(" %x - %x\n",
1839 RELOC(mem_reserve_map
)[i
].base
,
1840 RELOC(mem_reserve_map
)[i
].size
);
1843 RELOC(mem_reserve_cnt
) = MEM_RESERVE_MAP_SIZE
;
1845 prom_printf("Device tree strings 0x%x -> 0x%x\n",
1846 RELOC(dt_string_start
), RELOC(dt_string_end
));
1847 prom_printf("Device tree struct 0x%x -> 0x%x\n",
1848 RELOC(dt_struct_start
), RELOC(dt_struct_end
));
1853 static void __init
fixup_device_tree(void)
1855 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
1856 phandle u3
, i2c
, mpic
;
1861 /* Some G5s have a missing interrupt definition, fix it up here */
1862 u3
= call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
1863 if (!PHANDLE_VALID(u3
))
1865 i2c
= call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
1866 if (!PHANDLE_VALID(i2c
))
1868 mpic
= call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
1869 if (!PHANDLE_VALID(mpic
))
1872 /* check if proper rev of u3 */
1873 if (prom_getprop(u3
, "device-rev", &u3_rev
, sizeof(u3_rev
))
1876 if (u3_rev
< 0x35 || u3_rev
> 0x39)
1878 /* does it need fixup ? */
1879 if (prom_getproplen(i2c
, "interrupts") > 0)
1882 prom_printf("fixing up bogus interrupts for u3 i2c...\n");
1884 /* interrupt on this revision of u3 is number 0 and level */
1887 prom_setprop(i2c
, "interrupts", &interrupts
, sizeof(interrupts
));
1889 prom_setprop(i2c
, "interrupt-parent", &parent
, sizeof(parent
));
1894 static void __init
prom_find_boot_cpu(void)
1896 struct prom_t
*_prom
= &RELOC(prom
);
1902 if (prom_getprop(_prom
->chosen
, "cpu", &prom_cpu
, sizeof(prom_cpu
)) <= 0)
1905 cpu_pkg
= call_prom("instance-to-package", 1, 1, prom_cpu
);
1907 prom_getprop(cpu_pkg
, "reg", &getprop_rval
, sizeof(getprop_rval
));
1908 _prom
->cpu
= getprop_rval
;
1910 prom_debug("Booting CPU hw index = 0x%x\n", _prom
->cpu
);
1913 static void __init
prom_check_initrd(unsigned long r3
, unsigned long r4
)
1915 #ifdef CONFIG_BLK_DEV_INITRD
1916 struct prom_t
*_prom
= &RELOC(prom
);
1918 if (r3
&& r4
&& r4
!= 0xdeadbeef) {
1921 RELOC(prom_initrd_start
) = (r3
>= KERNELBASE
) ? __pa(r3
) : r3
;
1922 RELOC(prom_initrd_end
) = RELOC(prom_initrd_start
) + r4
;
1924 val
= RELOC(prom_initrd_start
);
1925 prom_setprop(_prom
->chosen
, "linux,initrd-start", &val
,
1927 val
= RELOC(prom_initrd_end
);
1928 prom_setprop(_prom
->chosen
, "linux,initrd-end", &val
,
1931 reserve_mem(RELOC(prom_initrd_start
),
1932 RELOC(prom_initrd_end
) - RELOC(prom_initrd_start
));
1934 prom_debug("initrd_start=0x%x\n", RELOC(prom_initrd_start
));
1935 prom_debug("initrd_end=0x%x\n", RELOC(prom_initrd_end
));
1937 #endif /* CONFIG_BLK_DEV_INITRD */
1941 * We enter here early on, when the Open Firmware prom is still
1942 * handling exceptions and the MMU hash table for us.
1945 unsigned long __init
prom_init(unsigned long r3
, unsigned long r4
,
1947 unsigned long r6
, unsigned long r7
)
1949 struct prom_t
*_prom
;
1952 unsigned long offset
= reloc_offset();
1958 _prom
= &RELOC(prom
);
1961 * First zero the BSS
1963 memset(&RELOC(__bss_start
), 0, __bss_stop
- __bss_start
);
1966 * Init interface to Open Firmware, get some node references,
1969 prom_init_client_services(pp
);
1972 * Init prom stdout device
1977 * See if this OF is old enough that we need to do explicit maps
1982 * Check for an initrd
1984 prom_check_initrd(r3
, r4
);
1987 * Get default machine type. At this point, we do not differentiate
1988 * between pSeries SMP and pSeries LPAR
1990 RELOC(of_platform
) = prom_find_machine_type();
1991 getprop_rval
= RELOC(of_platform
);
1992 prom_setprop(_prom
->chosen
, "linux,platform",
1993 &getprop_rval
, sizeof(getprop_rval
));
1995 #ifdef CONFIG_PPC_PSERIES
1997 * On pSeries, inform the firmware about our capabilities
1999 if (RELOC(of_platform
) & PLATFORM_PSERIES
)
2000 prom_send_capabilities();
2004 * Copy the CPU hold code
2006 if (RELOC(of_platform
) != PLATFORM_POWERMAC
)
2007 copy_and_flush(0, KERNELBASE
+ offset
, 0x100, 0);
2010 * Do early parsing of command line
2012 early_cmdline_parse();
2015 * Initialize memory management within prom_init
2020 * Determine which cpu is actually running right _now_
2022 prom_find_boot_cpu();
2025 * Initialize display devices
2027 prom_check_displays();
2031 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
2032 * that uses the allocator, we need to make sure we get the top of memory
2033 * available for us here...
2035 if (RELOC(of_platform
) == PLATFORM_PSERIES
)
2036 prom_initialize_tce_table();
2040 * On non-powermacs, try to instantiate RTAS and puts all CPUs
2041 * in spin-loops. PowerMacs don't have a working RTAS and use
2042 * a different way to spin CPUs
2044 if (RELOC(of_platform
) != PLATFORM_POWERMAC
) {
2045 prom_instantiate_rtas();
2050 * Fill in some infos for use by the kernel later on
2052 if (RELOC(prom_memory_limit
))
2053 prom_setprop(_prom
->chosen
, "linux,memory-limit",
2054 &RELOC(prom_memory_limit
),
2055 sizeof(prom_memory_limit
));
2057 if (RELOC(ppc64_iommu_off
))
2058 prom_setprop(_prom
->chosen
, "linux,iommu-off", NULL
, 0);
2060 if (RELOC(iommu_force_on
))
2061 prom_setprop(_prom
->chosen
, "linux,iommu-force-on", NULL
, 0);
2063 if (RELOC(prom_tce_alloc_start
)) {
2064 prom_setprop(_prom
->chosen
, "linux,tce-alloc-start",
2065 &RELOC(prom_tce_alloc_start
),
2066 sizeof(prom_tce_alloc_start
));
2067 prom_setprop(_prom
->chosen
, "linux,tce-alloc-end",
2068 &RELOC(prom_tce_alloc_end
),
2069 sizeof(prom_tce_alloc_end
));
2074 * Fixup any known bugs in the device-tree
2076 fixup_device_tree();
2079 * Now finally create the flattened device-tree
2081 prom_printf("copying OF device tree ...\n");
2082 flatten_device_tree();
2085 * in case stdin is USB and still active on IBM machines...
2086 * Unfortunately quiesce crashes on some powermacs if we have
2087 * closed stdin already (in particular the powerbook 101).
2089 if (RELOC(of_platform
) != PLATFORM_POWERMAC
)
2093 * Call OF "quiesce" method to shut down pending DMA's from
2096 prom_printf("Calling quiesce ...\n");
2097 call_prom("quiesce", 0, 0);
2100 * And finally, call the kernel passing it the flattened device
2101 * tree and NULL as r5, thus triggering the new entry point which
2102 * is common to us and kexec
2104 hdr
= RELOC(dt_header_start
);
2105 prom_printf("returning from prom_init\n");
2106 prom_debug("->dt_header_start=0x%x\n", hdr
);
2109 reloc_got2(-offset
);
2112 __start(hdr
, KERNELBASE
+ offset
, 0);