2 * Procedures for creating, accessing and interpreting the device tree.
4 * Paul Mackerras August 1996.
5 * Copyright (C) 1996-2005 Paul Mackerras.
7 * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
8 * {engebret|bergner}@us.ibm.com
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
19 #include <linux/kernel.h>
20 #include <linux/string.h>
21 #include <linux/init.h>
22 #include <linux/threads.h>
23 #include <linux/spinlock.h>
24 #include <linux/types.h>
25 #include <linux/pci.h>
26 #include <linux/stringify.h>
27 #include <linux/delay.h>
28 #include <linux/initrd.h>
29 #include <linux/bitops.h>
30 #include <linux/export.h>
31 #include <linux/kexec.h>
32 #include <linux/irq.h>
33 #include <linux/memblock.h>
35 #include <linux/of_fdt.h>
36 #include <linux/libfdt.h>
37 #include <linux/cpu.h>
42 #include <asm/processor.h>
45 #include <asm/kdump.h>
49 #include <asm/pgtable.h>
50 #include <asm/iommu.h>
51 #include <asm/btext.h>
52 #include <asm/sections.h>
53 #include <asm/machdep.h>
54 #include <asm/pci-bridge.h>
55 #include <asm/kexec.h>
57 #include <asm/fadump.h>
58 #include <asm/epapr_hcalls.h>
59 #include <asm/firmware.h>
60 #include <asm/dt_cpu_ftrs.h>
62 #include <mm/mmu_decl.h>
65 #define DBG(fmt...) printk(KERN_ERR fmt)
71 int __initdata iommu_is_off
;
72 int __initdata iommu_force_on
;
73 unsigned long tce_alloc_start
, tce_alloc_end
;
76 static phys_addr_t first_memblock_size
;
77 static int __initdata boot_cpu_count
;
79 static int __init
early_parse_mem(char *p
)
84 memory_limit
= PAGE_ALIGN(memparse(p
, &p
));
85 DBG("memory limit = 0x%llx\n", memory_limit
);
89 early_param("mem", early_parse_mem
);
92 * overlaps_initrd - check for overlap with page aligned extension of
95 static inline int overlaps_initrd(unsigned long start
, unsigned long size
)
97 #ifdef CONFIG_BLK_DEV_INITRD
101 return (start
+ size
) > _ALIGN_DOWN(initrd_start
, PAGE_SIZE
) &&
102 start
<= _ALIGN_UP(initrd_end
, PAGE_SIZE
);
109 * move_device_tree - move tree to an unused area, if needed.
111 * The device tree may be allocated beyond our memory limit, or inside the
112 * crash kernel region for kdump, or within the page aligned range of initrd.
113 * If so, move it out of the way.
115 static void __init
move_device_tree(void)
117 unsigned long start
, size
;
120 DBG("-> move_device_tree\n");
122 start
= __pa(initial_boot_params
);
123 size
= fdt_totalsize(initial_boot_params
);
125 if ((memory_limit
&& (start
+ size
) > PHYSICAL_START
+ memory_limit
) ||
126 overlaps_crashkernel(start
, size
) ||
127 overlaps_initrd(start
, size
)) {
128 p
= __va(memblock_alloc(size
, PAGE_SIZE
));
129 memcpy(p
, initial_boot_params
, size
);
130 initial_boot_params
= p
;
131 DBG("Moved device tree to 0x%p\n", p
);
134 DBG("<- move_device_tree\n");
138 * ibm,pa-features is a per-cpu property that contains a string of
139 * attribute descriptors, each of which has a 2 byte header plus up
140 * to 254 bytes worth of processor attribute bits. First header
141 * byte specifies the number of bytes following the header.
142 * Second header byte is an "attribute-specifier" type, of which
143 * zero is the only currently-defined value.
144 * Implementation: Pass in the byte and bit offset for the feature
145 * that we are interested in. The function will return -1 if the
146 * pa-features property is missing, or a 1/0 to indicate if the feature
147 * is supported/not supported. Note that the bit numbers are
148 * big-endian to match the definition in PAPR.
150 static struct ibm_pa_feature
{
151 unsigned long cpu_features
; /* CPU_FTR_xxx bit */
152 unsigned long mmu_features
; /* MMU_FTR_xxx bit */
153 unsigned int cpu_user_ftrs
; /* PPC_FEATURE_xxx bit */
154 unsigned int cpu_user_ftrs2
; /* PPC_FEATURE2_xxx bit */
155 unsigned char pabyte
; /* byte number in ibm,pa-features */
156 unsigned char pabit
; /* bit number (big-endian) */
157 unsigned char invert
; /* if 1, pa bit set => clear feature */
158 } ibm_pa_features
[] __initdata
= {
159 { .pabyte
= 0, .pabit
= 0, .cpu_user_ftrs
= PPC_FEATURE_HAS_MMU
},
160 { .pabyte
= 0, .pabit
= 1, .cpu_user_ftrs
= PPC_FEATURE_HAS_FPU
},
161 { .pabyte
= 0, .pabit
= 3, .cpu_features
= CPU_FTR_CTRL
},
162 { .pabyte
= 0, .pabit
= 6, .cpu_features
= CPU_FTR_NOEXECUTE
},
163 { .pabyte
= 1, .pabit
= 2, .mmu_features
= MMU_FTR_CI_LARGE_PAGE
},
164 #ifdef CONFIG_PPC_RADIX_MMU
165 { .pabyte
= 40, .pabit
= 0, .mmu_features
= MMU_FTR_TYPE_RADIX
},
167 { .pabyte
= 1, .pabit
= 1, .invert
= 1, .cpu_features
= CPU_FTR_NODSISRALIGN
},
168 { .pabyte
= 5, .pabit
= 0, .cpu_features
= CPU_FTR_REAL_LE
,
169 .cpu_user_ftrs
= PPC_FEATURE_TRUE_LE
},
171 * If the kernel doesn't support TM (ie CONFIG_PPC_TRANSACTIONAL_MEM=n),
172 * we don't want to turn on TM here, so we use the *_COMP versions
173 * which are 0 if the kernel doesn't support TM.
175 { .pabyte
= 22, .pabit
= 0, .cpu_features
= CPU_FTR_TM_COMP
,
176 .cpu_user_ftrs2
= PPC_FEATURE2_HTM_COMP
| PPC_FEATURE2_HTM_NOSC_COMP
},
179 static void __init
scan_features(unsigned long node
, const unsigned char *ftrs
,
180 unsigned long tablelen
,
181 struct ibm_pa_feature
*fp
,
182 unsigned long ft_size
)
184 unsigned long i
, len
, bit
;
186 /* find descriptor with type == 0 */
192 return; /* descriptor 0 not found */
199 /* loop over bits we know about */
200 for (i
= 0; i
< ft_size
; ++i
, ++fp
) {
201 if (fp
->pabyte
>= ftrs
[0])
203 bit
= (ftrs
[2 + fp
->pabyte
] >> (7 - fp
->pabit
)) & 1;
204 if (bit
^ fp
->invert
) {
205 cur_cpu_spec
->cpu_features
|= fp
->cpu_features
;
206 cur_cpu_spec
->cpu_user_features
|= fp
->cpu_user_ftrs
;
207 cur_cpu_spec
->cpu_user_features2
|= fp
->cpu_user_ftrs2
;
208 cur_cpu_spec
->mmu_features
|= fp
->mmu_features
;
210 cur_cpu_spec
->cpu_features
&= ~fp
->cpu_features
;
211 cur_cpu_spec
->cpu_user_features
&= ~fp
->cpu_user_ftrs
;
212 cur_cpu_spec
->cpu_user_features2
&= ~fp
->cpu_user_ftrs2
;
213 cur_cpu_spec
->mmu_features
&= ~fp
->mmu_features
;
218 static void __init
check_cpu_pa_features(unsigned long node
)
220 const unsigned char *pa_ftrs
;
223 pa_ftrs
= of_get_flat_dt_prop(node
, "ibm,pa-features", &tablelen
);
227 scan_features(node
, pa_ftrs
, tablelen
,
228 ibm_pa_features
, ARRAY_SIZE(ibm_pa_features
));
231 #ifdef CONFIG_PPC_STD_MMU_64
232 static void __init
init_mmu_slb_size(unsigned long node
)
234 const __be32
*slb_size_ptr
;
236 slb_size_ptr
= of_get_flat_dt_prop(node
, "slb-size", NULL
) ? :
237 of_get_flat_dt_prop(node
, "ibm,slb-size", NULL
);
240 mmu_slb_size
= be32_to_cpup(slb_size_ptr
);
243 #define init_mmu_slb_size(node) do { } while(0)
246 static struct feature_property
{
249 unsigned long cpu_feature
;
250 unsigned long cpu_user_ftr
;
251 } feature_properties
[] __initdata
= {
252 #ifdef CONFIG_ALTIVEC
253 {"altivec", 0, CPU_FTR_ALTIVEC
, PPC_FEATURE_HAS_ALTIVEC
},
254 {"ibm,vmx", 1, CPU_FTR_ALTIVEC
, PPC_FEATURE_HAS_ALTIVEC
},
255 #endif /* CONFIG_ALTIVEC */
257 /* Yes, this _really_ is ibm,vmx == 2 to enable VSX */
258 {"ibm,vmx", 2, CPU_FTR_VSX
, PPC_FEATURE_HAS_VSX
},
259 #endif /* CONFIG_VSX */
261 {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP
},
262 {"ibm,purr", 1, CPU_FTR_PURR
, 0},
263 {"ibm,spurr", 1, CPU_FTR_SPURR
, 0},
264 #endif /* CONFIG_PPC64 */
267 #if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU)
268 static inline void identical_pvr_fixup(unsigned long node
)
271 const char *model
= of_get_flat_dt_prop(node
, "model", NULL
);
274 * Since 440GR(x)/440EP(x) processors have the same pvr,
275 * we check the node path and set bit 28 in the cur_cpu_spec
276 * pvr for EP(x) processor version. This bit is always 0 in
277 * the "real" pvr. Then we call identify_cpu again with
278 * the new logical pvr to enable FPU support.
280 if (model
&& strstr(model
, "440EP")) {
281 pvr
= cur_cpu_spec
->pvr_value
| 0x8;
282 identify_cpu(0, pvr
);
283 DBG("Using logical pvr %x for %s\n", pvr
, model
);
287 #define identical_pvr_fixup(node) do { } while(0)
290 static void __init
check_cpu_feature_properties(unsigned long node
)
293 struct feature_property
*fp
= feature_properties
;
296 for (i
= 0; i
< ARRAY_SIZE(feature_properties
); ++i
, ++fp
) {
297 prop
= of_get_flat_dt_prop(node
, fp
->name
, NULL
);
298 if (prop
&& be32_to_cpup(prop
) >= fp
->min_value
) {
299 cur_cpu_spec
->cpu_features
|= fp
->cpu_feature
;
300 cur_cpu_spec
->cpu_user_features
|= fp
->cpu_user_ftr
;
306 * Adjust the logical id of a boot cpu to fall under nr_cpu_ids. Map it to
307 * last core slot in the allocated paca array.
309 * e.g. on SMT=8 system, kernel booted with nr_cpus=1 and boot cpu = 33,
310 * align nr_cpu_ids to MAX_SMT value 8. Allocate paca array to hold up-to
311 * MAX_SMT=8 cpus. Since boot cpu 33 is greater than nr_cpus (8), adjust
312 * its logical id so that new id becomes less than nr_cpu_ids. Make sure
313 * that boot cpu's new logical id is aligned to its thread id and falls
314 * under last nthreads slots available in paca array. In this case the
315 * boot cpu 33 is adjusted to new boot cpu id 1.
318 static inline void adjust_boot_cpuid(int nthreads
, int phys_id
)
320 boot_hw_cpuid
= phys_id
;
321 if (boot_cpuid
>= nr_cpu_ids
) {
322 boot_cpuid
= (boot_cpuid
% nthreads
) + (nr_cpu_ids
- nthreads
);
323 pr_info("Adjusted logical boot cpu id: logical %d physical %d\n",
324 boot_cpuid
, phys_id
);
328 static int __init
early_init_dt_scan_cpus(unsigned long node
,
329 const char *uname
, int depth
,
332 const char *type
= of_get_flat_dt_prop(node
, "device_type", NULL
);
334 const __be32
*intserv
;
338 int found_thread
= 0;
340 /* We are scanning "cpu" nodes only */
341 if (type
== NULL
|| strcmp(type
, "cpu") != 0)
344 /* Get physical cpuid */
345 intserv
= of_get_flat_dt_prop(node
, "ibm,ppc-interrupt-server#s", &len
);
347 intserv
= of_get_flat_dt_prop(node
, "reg", &len
);
349 nthreads
= len
/ sizeof(int);
353 * Now that we know threads per core lets align nr_cpu_ids to
356 if (nr_cpu_ids
% nthreads
) {
357 nr_cpu_ids
= _ALIGN_UP(nr_cpu_ids
, nthreads
);
358 pr_info("Aligned nr_cpus to SMT=%d, nr_cpu_ids = %d\n",
359 nthreads
, nr_cpu_ids
);
364 * Now see if any of these threads match our boot cpu.
365 * NOTE: This must match the parsing done in smp_setup_cpu_maps.
367 for (i
= 0; i
< nthreads
; i
++) {
369 * version 2 of the kexec param format adds the phys cpuid of
372 if (fdt_version(initial_boot_params
) >= 2) {
373 if (be32_to_cpu(intserv
[i
]) ==
374 fdt_boot_cpuid_phys(initial_boot_params
)) {
375 found
= boot_cpu_count
;
380 * Check if it's the boot-cpu, set it's hw index now,
381 * unfortunately this format did not support booting
382 * off secondary threads.
384 if (of_get_flat_dt_prop(node
,
385 "linux,boot-cpu", NULL
) != NULL
)
386 found
= boot_cpu_count
;
389 /* logical cpu id is always 0 on UP kernels */
394 /* Not the boot CPU */
398 DBG("boot cpu: logical %d physical %d\n", found
,
399 be32_to_cpu(intserv
[found_thread
]));
401 adjust_boot_cpuid(nthreads
, be32_to_cpu(intserv
[found_thread
]));
402 set_hard_smp_processor_id(boot_cpuid
,
403 be32_to_cpu(intserv
[found_thread
]));
406 * PAPR defines "logical" PVR values for cpus that
407 * meet various levels of the architecture:
408 * 0x0f000001 Architecture version 2.04
409 * 0x0f000002 Architecture version 2.05
410 * If the cpu-version property in the cpu node contains
411 * such a value, we call identify_cpu again with the
412 * logical PVR value in order to use the cpu feature
413 * bits appropriate for the architecture level.
415 * A POWER6 partition in "POWER6 architected" mode
416 * uses the 0x0f000002 PVR value; in POWER5+ mode
417 * it uses 0x0f000001.
419 * If we're using device tree CPU feature discovery then we don't
420 * support the cpu-version property, and it's the responsibility of the
421 * firmware/hypervisor to provide the correct feature set for the
422 * architecture level via the ibm,powerpc-cpu-features binding.
424 if (!dt_cpu_ftrs_in_use()) {
425 prop
= of_get_flat_dt_prop(node
, "cpu-version", NULL
);
426 if (prop
&& (be32_to_cpup(prop
) & 0xff000000) == 0x0f000000)
427 identify_cpu(0, be32_to_cpup(prop
));
429 check_cpu_feature_properties(node
);
430 check_cpu_pa_features(node
);
433 identical_pvr_fixup(node
);
434 init_mmu_slb_size(node
);
438 cur_cpu_spec
->cpu_features
&= ~CPU_FTR_SMT
;
439 else if (!dt_cpu_ftrs_in_use())
440 cur_cpu_spec
->cpu_features
|= CPU_FTR_SMT
;
446 static int __init
early_init_dt_scan_chosen_ppc(unsigned long node
,
448 int depth
, void *data
)
450 const unsigned long *lprop
; /* All these set by kernel, so no need to convert endian */
452 /* Use common scan routine to determine if this is the chosen node */
453 if (early_init_dt_scan_chosen(node
, uname
, depth
, data
) == 0)
457 /* check if iommu is forced on or off */
458 if (of_get_flat_dt_prop(node
, "linux,iommu-off", NULL
) != NULL
)
460 if (of_get_flat_dt_prop(node
, "linux,iommu-force-on", NULL
) != NULL
)
464 /* mem=x on the command line is the preferred mechanism */
465 lprop
= of_get_flat_dt_prop(node
, "linux,memory-limit", NULL
);
467 memory_limit
= *lprop
;
470 lprop
= of_get_flat_dt_prop(node
, "linux,tce-alloc-start", NULL
);
472 tce_alloc_start
= *lprop
;
473 lprop
= of_get_flat_dt_prop(node
, "linux,tce-alloc-end", NULL
);
475 tce_alloc_end
= *lprop
;
478 #ifdef CONFIG_KEXEC_CORE
479 lprop
= of_get_flat_dt_prop(node
, "linux,crashkernel-base", NULL
);
481 crashk_res
.start
= *lprop
;
483 lprop
= of_get_flat_dt_prop(node
, "linux,crashkernel-size", NULL
);
485 crashk_res
.end
= crashk_res
.start
+ *lprop
- 1;
492 #ifdef CONFIG_PPC_PSERIES
494 * Interpret the ibm,dynamic-memory property in the
495 * /ibm,dynamic-reconfiguration-memory node.
496 * This contains a list of memory blocks along with NUMA affinity
499 static int __init
early_init_dt_scan_drconf_memory(unsigned long node
)
501 const __be32
*dm
, *ls
, *usm
;
503 unsigned long n
, flags
;
504 u64 base
, size
, memblock_size
;
505 unsigned int is_kexec_kdump
= 0, rngs
;
507 ls
= of_get_flat_dt_prop(node
, "ibm,lmb-size", &l
);
508 if (ls
== NULL
|| l
< dt_root_size_cells
* sizeof(__be32
))
510 memblock_size
= dt_mem_next_cell(dt_root_size_cells
, &ls
);
512 dm
= of_get_flat_dt_prop(node
, "ibm,dynamic-memory", &l
);
513 if (dm
== NULL
|| l
< sizeof(__be32
))
516 n
= of_read_number(dm
++, 1); /* number of entries */
517 if (l
< (n
* (dt_root_addr_cells
+ 4) + 1) * sizeof(__be32
))
520 /* check if this is a kexec/kdump kernel. */
521 usm
= of_get_flat_dt_prop(node
, "linux,drconf-usable-memory",
526 for (; n
!= 0; --n
) {
527 base
= dt_mem_next_cell(dt_root_addr_cells
, &dm
);
528 flags
= of_read_number(&dm
[3], 1);
529 /* skip DRC index, pad, assoc. list index, flags */
531 /* skip this block if the reserved bit is set in flags
532 or if the block is not assigned to this partition */
533 if ((flags
& DRCONF_MEM_RESERVED
) ||
534 !(flags
& DRCONF_MEM_ASSIGNED
))
536 size
= memblock_size
;
538 if (is_kexec_kdump
) {
540 * For each memblock in ibm,dynamic-memory, a corresponding
541 * entry in linux,drconf-usable-memory property contains
542 * a counter 'p' followed by 'p' (base, size) duple.
543 * Now read the counter from
544 * linux,drconf-usable-memory property
546 rngs
= dt_mem_next_cell(dt_root_size_cells
, &usm
);
547 if (!rngs
) /* there are no (base, size) duple */
551 if (is_kexec_kdump
) {
552 base
= dt_mem_next_cell(dt_root_addr_cells
,
554 size
= dt_mem_next_cell(dt_root_size_cells
,
558 if (base
>= 0x80000000ul
)
560 if ((base
+ size
) > 0x80000000ul
)
561 size
= 0x80000000ul
- base
;
563 memblock_add(base
, size
);
570 #define early_init_dt_scan_drconf_memory(node) 0
571 #endif /* CONFIG_PPC_PSERIES */
573 static int __init
early_init_dt_scan_memory_ppc(unsigned long node
,
575 int depth
, void *data
)
578 strcmp(uname
, "ibm,dynamic-reconfiguration-memory") == 0)
579 return early_init_dt_scan_drconf_memory(node
);
581 return early_init_dt_scan_memory(node
, uname
, depth
, data
);
585 * For a relocatable kernel, we need to get the memstart_addr first,
586 * then use it to calculate the virtual kernel start address. This has
587 * to happen at a very early stage (before machine_init). In this case,
588 * we just want to get the memstart_address and would not like to mess the
589 * memblock at this stage. So introduce a variable to skip the memblock_add()
592 #ifdef CONFIG_RELOCATABLE
593 static int add_mem_to_memblock
= 1;
595 #define add_mem_to_memblock 1
598 void __init
early_init_dt_add_memory_arch(u64 base
, u64 size
)
602 if (base
>= 0x80000000ul
)
604 if ((base
+ size
) > 0x80000000ul
)
605 size
= 0x80000000ul
- base
;
608 /* Keep track of the beginning of memory -and- the size of
609 * the very first block in the device-tree as it represents
610 * the RMA on ppc64 server
612 if (base
< memstart_addr
) {
613 memstart_addr
= base
;
614 first_memblock_size
= size
;
617 /* Add the chunk to the MEMBLOCK list */
618 if (add_mem_to_memblock
)
619 memblock_add(base
, size
);
622 static void __init
early_reserve_mem_dt(void)
624 unsigned long i
, dt_root
;
628 early_init_fdt_reserve_self();
629 early_init_fdt_scan_reserved_mem();
631 dt_root
= of_get_flat_dt_root();
633 prop
= of_get_flat_dt_prop(dt_root
, "reserved-ranges", &len
);
638 DBG("Found new-style reserved-ranges\n");
640 /* Each reserved range is an (address,size) pair, 2 cells each,
641 * totalling 4 cells per range. */
642 for (i
= 0; i
< len
/ (sizeof(*prop
) * 4); i
++) {
645 base
= of_read_number(prop
+ (i
* 4) + 0, 2);
646 size
= of_read_number(prop
+ (i
* 4) + 2, 2);
649 DBG("reserving: %llx -> %llx\n", base
, size
);
650 memblock_reserve(base
, size
);
655 static void __init
early_reserve_mem(void)
659 reserve_map
= (__be64
*)(((unsigned long)initial_boot_params
) +
660 fdt_off_mem_rsvmap(initial_boot_params
));
662 /* Look for the new "reserved-regions" property in the DT */
663 early_reserve_mem_dt();
665 #ifdef CONFIG_BLK_DEV_INITRD
666 /* Then reserve the initrd, if any */
667 if (initrd_start
&& (initrd_end
> initrd_start
)) {
668 memblock_reserve(_ALIGN_DOWN(__pa(initrd_start
), PAGE_SIZE
),
669 _ALIGN_UP(initrd_end
, PAGE_SIZE
) -
670 _ALIGN_DOWN(initrd_start
, PAGE_SIZE
));
672 #endif /* CONFIG_BLK_DEV_INITRD */
676 * Handle the case where we might be booting from an old kexec
677 * image that setup the mem_rsvmap as pairs of 32-bit values
679 if (be64_to_cpup(reserve_map
) > 0xffffffffull
) {
680 u32 base_32
, size_32
;
681 __be32
*reserve_map_32
= (__be32
*)reserve_map
;
683 DBG("Found old 32-bit reserve map\n");
686 base_32
= be32_to_cpup(reserve_map_32
++);
687 size_32
= be32_to_cpup(reserve_map_32
++);
690 DBG("reserving: %x -> %x\n", base_32
, size_32
);
691 memblock_reserve(base_32
, size_32
);
698 void __init
early_init_devtree(void *params
)
702 DBG(" -> early_init_devtree(%p)\n", params
);
704 /* Too early to BUG_ON(), do it by hand */
705 if (!early_init_dt_verify(params
))
706 panic("BUG: Failed verifying flat device tree, bad version?");
708 #ifdef CONFIG_PPC_RTAS
709 /* Some machines might need RTAS info for debugging, grab it now. */
710 of_scan_flat_dt(early_init_dt_scan_rtas
, NULL
);
713 #ifdef CONFIG_PPC_POWERNV
714 /* Some machines might need OPAL info for debugging, grab it now. */
715 of_scan_flat_dt(early_init_dt_scan_opal
, NULL
);
718 #ifdef CONFIG_FA_DUMP
719 /* scan tree to see if dump is active during last boot */
720 of_scan_flat_dt(early_init_dt_scan_fw_dump
, NULL
);
723 /* Retrieve various informations from the /chosen node of the
724 * device-tree, including the platform type, initrd location and
725 * size, TCE reserve, and more ...
727 of_scan_flat_dt(early_init_dt_scan_chosen_ppc
, boot_command_line
);
729 /* Scan memory nodes and rebuild MEMBLOCKs */
730 of_scan_flat_dt(early_init_dt_scan_root
, NULL
);
731 of_scan_flat_dt(early_init_dt_scan_memory_ppc
, NULL
);
735 /* make sure we've parsed cmdline for mem= before this */
737 first_memblock_size
= min_t(u64
, first_memblock_size
, memory_limit
);
738 setup_initial_memory_limit(memstart_addr
, first_memblock_size
);
739 /* Reserve MEMBLOCK regions used by kernel, initrd, dt, etc... */
740 memblock_reserve(PHYSICAL_START
, __pa(klimit
) - PHYSICAL_START
);
741 /* If relocatable, reserve first 32k for interrupt vectors etc. */
742 if (PHYSICAL_START
> MEMORY_START
)
743 memblock_reserve(MEMORY_START
, 0x8000);
744 reserve_kdump_trampoline();
745 #ifdef CONFIG_FA_DUMP
747 * If we fail to reserve memory for firmware-assisted dump then
748 * fallback to kexec based kdump.
750 if (fadump_reserve_mem() == 0)
752 reserve_crashkernel();
755 /* Ensure that total memory size is page-aligned. */
756 limit
= ALIGN(memory_limit
?: memblock_phys_mem_size(), PAGE_SIZE
);
757 memblock_enforce_memory_limit(limit
);
759 memblock_allow_resize();
762 DBG("Phys. mem: %llx\n", memblock_phys_mem_size());
764 /* We may need to relocate the flat tree, do it now.
765 * FIXME .. and the initrd too? */
770 DBG("Scanning CPUs ...\n");
774 /* Retrieve CPU related informations from the flat tree
775 * (altivec support, boot CPU ID, ...)
777 of_scan_flat_dt(early_init_dt_scan_cpus
, NULL
);
778 if (boot_cpuid
< 0) {
779 printk("Failed to identify boot CPU !\n");
783 #if defined(CONFIG_SMP) && defined(CONFIG_PPC64)
784 /* We'll later wait for secondaries to check in; there are
785 * NCPUS-1 non-boot CPUs :-)
787 spinning_secondaries
= boot_cpu_count
- 1;
790 mmu_early_init_devtree();
792 #ifdef CONFIG_PPC_POWERNV
793 /* Scan and build the list of machine check recoverable ranges */
794 of_scan_flat_dt(early_init_dt_scan_recoverable_ranges
, NULL
);
796 epapr_paravirt_early_init();
798 /* Now try to figure out if we are running on LPAR and so on */
799 pseries_probe_fw_features();
801 #ifdef CONFIG_PPC_PS3
802 /* Identify PS3 firmware */
803 if (of_flat_dt_is_compatible(of_get_flat_dt_root(), "sony,ps3"))
804 powerpc_firmware_features
|= FW_FEATURE_PS3_POSSIBLE
;
807 DBG(" <- early_init_devtree()\n");
810 #ifdef CONFIG_RELOCATABLE
812 * This function run before early_init_devtree, so we have to init
813 * initial_boot_params.
815 void __init
early_get_first_memblock_info(void *params
, phys_addr_t
*size
)
817 /* Setup flat device-tree pointer */
818 initial_boot_params
= params
;
821 * Scan the memory nodes and set add_mem_to_memblock to 0 to avoid
824 add_mem_to_memblock
= 0;
825 of_scan_flat_dt(early_init_dt_scan_root
, NULL
);
826 of_scan_flat_dt(early_init_dt_scan_memory_ppc
, NULL
);
827 add_mem_to_memblock
= 1;
830 *size
= first_memblock_size
;
836 * New implementation of the OF "find" APIs, return a refcounted
837 * object, call of_node_put() when done. The device tree and list
838 * are protected by a rw_lock.
840 * Note that property management will need some locking as well,
841 * this isn't dealt with yet.
846 * of_get_ibm_chip_id - Returns the IBM "chip-id" of a device
847 * @np: device node of the device
849 * This looks for a property "ibm,chip-id" in the node or any
850 * of its parents and returns its content, or -1 if it cannot
853 int of_get_ibm_chip_id(struct device_node
*np
)
860 * Skiboot may produce memory nodes that contain more than one
861 * cell in chip-id, we only read the first one here.
863 if (!of_property_read_u32(np
, "ibm,chip-id", &chip_id
)) {
868 np
= of_get_next_parent(np
);
872 EXPORT_SYMBOL(of_get_ibm_chip_id
);
875 * cpu_to_chip_id - Return the cpus chip-id
876 * @cpu: The logical cpu number.
878 * Return the value of the ibm,chip-id property corresponding to the given
879 * logical cpu number. If the chip-id can not be found, returns -1.
881 int cpu_to_chip_id(int cpu
)
883 struct device_node
*np
;
885 np
= of_get_cpu_node(cpu
, NULL
);
890 return of_get_ibm_chip_id(np
);
892 EXPORT_SYMBOL(cpu_to_chip_id
);
894 bool arch_match_cpu_phys_id(int cpu
, u64 phys_id
)
896 return (int)phys_id
== get_hard_smp_processor_id(cpu
);