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/module.h>
31 #include <linux/kexec.h>
32 #include <linux/debugfs.h>
33 #include <linux/irq.h>
34 #include <linux/memblock.h>
39 #include <asm/processor.h>
42 #include <asm/kdump.h>
44 #include <asm/system.h>
47 #include <asm/pgtable.h>
49 #include <asm/iommu.h>
50 #include <asm/btext.h>
51 #include <asm/sections.h>
52 #include <asm/machdep.h>
53 #include <asm/pSeries_reconfig.h>
54 #include <asm/pci-bridge.h>
55 #include <asm/phyp_dump.h>
56 #include <asm/kexec.h>
57 #include <mm/mmu_decl.h>
60 #define DBG(fmt...) printk(KERN_ERR fmt)
66 int __initdata iommu_is_off;
67 int __initdata iommu_force_on;
68 unsigned long tce_alloc_start, tce_alloc_end;
72 static int __init early_parse_mem(char *p)
77 memory_limit = PAGE_ALIGN(memparse(p, &p));
78 DBG("memory limit = 0x%llx\n", (unsigned long long)memory_limit);
82 early_param("mem", early_parse_mem);
85 * move_device_tree - move tree to an unused area, if needed.
87 * The device tree may be allocated beyond our memory limit, or inside the
88 * crash kernel region for kdump. If so, move it out of the way.
90 static void __init move_device_tree(void)
92 unsigned long start, size;
95 DBG("-> move_device_tree\n");
97 start = __pa(initial_boot_params);
98 size = be32_to_cpu(initial_boot_params->totalsize);
100 if ((memory_limit && (start + size) > PHYSICAL_START + memory_limit) ||
101 overlaps_crashkernel(start, size)) {
102 p = __va(memblock_alloc(size, PAGE_SIZE));
103 memcpy(p, initial_boot_params, size);
104 initial_boot_params = (struct boot_param_header *)p;
105 DBG("Moved device tree to 0x%p\n", p);
108 DBG("<- move_device_tree\n");
112 * ibm,pa-features is a per-cpu property that contains a string of
113 * attribute descriptors, each of which has a 2 byte header plus up
114 * to 254 bytes worth of processor attribute bits. First header
115 * byte specifies the number of bytes following the header.
116 * Second header byte is an "attribute-specifier" type, of which
117 * zero is the only currently-defined value.
118 * Implementation: Pass in the byte and bit offset for the feature
119 * that we are interested in. The function will return -1 if the
120 * pa-features property is missing, or a 1/0 to indicate if the feature
121 * is supported/not supported. Note that the bit numbers are
122 * big-endian to match the definition in PAPR.
124 static struct ibm_pa_feature {
125 unsigned long cpu_features; /* CPU_FTR_xxx bit */
126 unsigned long mmu_features; /* MMU_FTR_xxx bit */
127 unsigned int cpu_user_ftrs; /* PPC_FEATURE_xxx bit */
128 unsigned char pabyte; /* byte number in ibm,pa-features */
129 unsigned char pabit; /* bit number (big-endian) */
130 unsigned char invert; /* if 1, pa bit set => clear feature */
131 } ibm_pa_features[] __initdata = {
132 {0, 0, PPC_FEATURE_HAS_MMU, 0, 0, 0},
133 {0, 0, PPC_FEATURE_HAS_FPU, 0, 1, 0},
134 {0, MMU_FTR_SLB, 0, 0, 2, 0},
135 {CPU_FTR_CTRL, 0, 0, 0, 3, 0},
136 {CPU_FTR_NOEXECUTE, 0, 0, 0, 6, 0},
137 {CPU_FTR_NODSISRALIGN, 0, 0, 1, 1, 1},
138 {0, MMU_FTR_CI_LARGE_PAGE, 0, 1, 2, 0},
139 {CPU_FTR_REAL_LE, PPC_FEATURE_TRUE_LE, 5, 0, 0},
142 static void __init scan_features(unsigned long node, unsigned char *ftrs,
143 unsigned long tablelen,
144 struct ibm_pa_feature *fp,
145 unsigned long ft_size)
147 unsigned long i, len, bit;
149 /* find descriptor with type == 0 */
155 return; /* descriptor 0 not found */
162 /* loop over bits we know about */
163 for (i = 0; i < ft_size; ++i, ++fp) {
164 if (fp->pabyte >= ftrs[0])
166 bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1;
167 if (bit ^ fp->invert) {
168 cur_cpu_spec->cpu_features |= fp->cpu_features;
169 cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs;
170 cur_cpu_spec->mmu_features |= fp->mmu_features;
172 cur_cpu_spec->cpu_features &= ~fp->cpu_features;
173 cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs;
174 cur_cpu_spec->mmu_features &= ~fp->mmu_features;
179 static void __init check_cpu_pa_features(unsigned long node)
181 unsigned char *pa_ftrs;
182 unsigned long tablelen;
184 pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen);
188 scan_features(node, pa_ftrs, tablelen,
189 ibm_pa_features, ARRAY_SIZE(ibm_pa_features));
192 #ifdef CONFIG_PPC_STD_MMU_64
193 static void __init check_cpu_slb_size(unsigned long node)
197 slb_size_ptr = of_get_flat_dt_prop(node, "slb-size", NULL);
198 if (slb_size_ptr != NULL) {
199 mmu_slb_size = *slb_size_ptr;
202 slb_size_ptr = of_get_flat_dt_prop(node, "ibm,slb-size", NULL);
203 if (slb_size_ptr != NULL) {
204 mmu_slb_size = *slb_size_ptr;
208 #define check_cpu_slb_size(node) do { } while(0)
211 static struct feature_property {
214 unsigned long cpu_feature;
215 unsigned long cpu_user_ftr;
216 } feature_properties[] __initdata = {
217 #ifdef CONFIG_ALTIVEC
218 {"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
219 {"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
220 #endif /* CONFIG_ALTIVEC */
222 /* Yes, this _really_ is ibm,vmx == 2 to enable VSX */
223 {"ibm,vmx", 2, CPU_FTR_VSX, PPC_FEATURE_HAS_VSX},
224 #endif /* CONFIG_VSX */
226 {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP},
227 {"ibm,purr", 1, CPU_FTR_PURR, 0},
228 {"ibm,spurr", 1, CPU_FTR_SPURR, 0},
229 #endif /* CONFIG_PPC64 */
232 #if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU)
233 static inline void identical_pvr_fixup(unsigned long node)
236 char *model = of_get_flat_dt_prop(node, "model", NULL);
239 * Since 440GR(x)/440EP(x) processors have the same pvr,
240 * we check the node path and set bit 28 in the cur_cpu_spec
241 * pvr for EP(x) processor version. This bit is always 0 in
242 * the "real" pvr. Then we call identify_cpu again with
243 * the new logical pvr to enable FPU support.
245 if (model && strstr(model, "440EP")) {
246 pvr = cur_cpu_spec->pvr_value | 0x8;
247 identify_cpu(0, pvr);
248 DBG("Using logical pvr %x for %s\n", pvr, model);
252 #define identical_pvr_fixup(node) do { } while(0)
255 static void __init check_cpu_feature_properties(unsigned long node)
258 struct feature_property *fp = feature_properties;
261 for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) {
262 prop = of_get_flat_dt_prop(node, fp->name, NULL);
263 if (prop && *prop >= fp->min_value) {
264 cur_cpu_spec->cpu_features |= fp->cpu_feature;
265 cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr;
270 static int __init early_init_dt_scan_cpus(unsigned long node,
271 const char *uname, int depth,
274 char *type = of_get_flat_dt_prop(node, "device_type", NULL);
281 /* We are scanning "cpu" nodes only */
282 if (type == NULL || strcmp(type, "cpu") != 0)
285 /* Get physical cpuid */
286 intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len);
288 nthreads = len / sizeof(int);
290 intserv = of_get_flat_dt_prop(node, "reg", NULL);
295 * Now see if any of these threads match our boot cpu.
296 * NOTE: This must match the parsing done in smp_setup_cpu_maps.
298 for (i = 0; i < nthreads; i++) {
300 * version 2 of the kexec param format adds the phys cpuid of
303 if (initial_boot_params && initial_boot_params->version >= 2) {
304 if (intserv[i] == initial_boot_params->boot_cpuid_phys)
305 found = boot_cpu_count;
308 * Check if it's the boot-cpu, set it's hw index now,
309 * unfortunately this format did not support booting
310 * off secondary threads.
312 if (of_get_flat_dt_prop(node,
313 "linux,boot-cpu", NULL) != NULL)
314 found = boot_cpu_count;
317 /* logical cpu id is always 0 on UP kernels */
323 DBG("boot cpu: logical %d physical %d\n", found,
326 set_hard_smp_processor_id(found, intserv[i]);
329 * PAPR defines "logical" PVR values for cpus that
330 * meet various levels of the architecture:
331 * 0x0f000001 Architecture version 2.04
332 * 0x0f000002 Architecture version 2.05
333 * If the cpu-version property in the cpu node contains
334 * such a value, we call identify_cpu again with the
335 * logical PVR value in order to use the cpu feature
336 * bits appropriate for the architecture level.
338 * A POWER6 partition in "POWER6 architected" mode
339 * uses the 0x0f000002 PVR value; in POWER5+ mode
340 * it uses 0x0f000001.
342 prop = of_get_flat_dt_prop(node, "cpu-version", NULL);
343 if (prop && (*prop & 0xff000000) == 0x0f000000)
344 identify_cpu(0, *prop);
346 identical_pvr_fixup(node);
349 check_cpu_feature_properties(node);
350 check_cpu_pa_features(node);
351 check_cpu_slb_size(node);
353 #ifdef CONFIG_PPC_PSERIES
355 cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
357 cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT;
363 int __init early_init_dt_scan_chosen_ppc(unsigned long node, const char *uname,
364 int depth, void *data)
366 unsigned long *lprop;
368 /* Use common scan routine to determine if this is the chosen node */
369 if (early_init_dt_scan_chosen(node, uname, depth, data) == 0)
373 /* check if iommu is forced on or off */
374 if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL)
376 if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL)
380 /* mem=x on the command line is the preferred mechanism */
381 lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL);
383 memory_limit = *lprop;
386 lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL);
388 tce_alloc_start = *lprop;
389 lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL);
391 tce_alloc_end = *lprop;
395 lprop = of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL);
397 crashk_res.start = *lprop;
399 lprop = of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL);
401 crashk_res.end = crashk_res.start + *lprop - 1;
408 #ifdef CONFIG_PPC_PSERIES
410 * Interpret the ibm,dynamic-memory property in the
411 * /ibm,dynamic-reconfiguration-memory node.
412 * This contains a list of memory blocks along with NUMA affinity
415 static int __init early_init_dt_scan_drconf_memory(unsigned long node)
417 __be32 *dm, *ls, *usm;
418 unsigned long l, n, flags;
419 u64 base, size, memblock_size;
420 unsigned int is_kexec_kdump = 0, rngs;
422 ls = of_get_flat_dt_prop(node, "ibm,lmb-size", &l);
423 if (ls == NULL || l < dt_root_size_cells * sizeof(__be32))
425 memblock_size = dt_mem_next_cell(dt_root_size_cells, &ls);
427 dm = of_get_flat_dt_prop(node, "ibm,dynamic-memory", &l);
428 if (dm == NULL || l < sizeof(__be32))
431 n = *dm++; /* number of entries */
432 if (l < (n * (dt_root_addr_cells + 4) + 1) * sizeof(__be32))
435 /* check if this is a kexec/kdump kernel. */
436 usm = of_get_flat_dt_prop(node, "linux,drconf-usable-memory",
441 for (; n != 0; --n) {
442 base = dt_mem_next_cell(dt_root_addr_cells, &dm);
444 /* skip DRC index, pad, assoc. list index, flags */
446 /* skip this block if the reserved bit is set in flags (0x80)
447 or if the block is not assigned to this partition (0x8) */
448 if ((flags & 0x80) || !(flags & 0x8))
450 size = memblock_size;
452 if (is_kexec_kdump) {
454 * For each memblock in ibm,dynamic-memory, a corresponding
455 * entry in linux,drconf-usable-memory property contains
456 * a counter 'p' followed by 'p' (base, size) duple.
457 * Now read the counter from
458 * linux,drconf-usable-memory property
460 rngs = dt_mem_next_cell(dt_root_size_cells, &usm);
461 if (!rngs) /* there are no (base, size) duple */
465 if (is_kexec_kdump) {
466 base = dt_mem_next_cell(dt_root_addr_cells,
468 size = dt_mem_next_cell(dt_root_size_cells,
472 if (base >= 0x80000000ul)
474 if ((base + size) > 0x80000000ul)
475 size = 0x80000000ul - base;
477 memblock_add(base, size);
484 #define early_init_dt_scan_drconf_memory(node) 0
485 #endif /* CONFIG_PPC_PSERIES */
487 static int __init early_init_dt_scan_memory_ppc(unsigned long node,
489 int depth, void *data)
492 strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0)
493 return early_init_dt_scan_drconf_memory(node);
495 return early_init_dt_scan_memory(node, uname, depth, data);
498 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
502 if (base >= 0x80000000ul)
504 if ((base + size) > 0x80000000ul)
505 size = 0x80000000ul - base;
509 /* First MEMBLOCK added, do some special initializations */
510 if (memstart_addr == ~(phys_addr_t)0)
511 setup_initial_memory_limit(base, size);
512 memstart_addr = min((u64)memstart_addr, base);
514 /* Add the chunk to the MEMBLOCK list */
515 memblock_add(base, size);
518 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
520 return __va(memblock_alloc(size, align));
523 #ifdef CONFIG_BLK_DEV_INITRD
524 void __init early_init_dt_setup_initrd_arch(unsigned long start,
527 initrd_start = (unsigned long)__va(start);
528 initrd_end = (unsigned long)__va(end);
529 initrd_below_start_ok = 1;
533 static void __init early_reserve_mem(void)
537 unsigned long self_base;
538 unsigned long self_size;
540 reserve_map = (u64 *)(((unsigned long)initial_boot_params) +
541 initial_boot_params->off_mem_rsvmap);
543 /* before we do anything, lets reserve the dt blob */
544 self_base = __pa((unsigned long)initial_boot_params);
545 self_size = initial_boot_params->totalsize;
546 memblock_reserve(self_base, self_size);
548 #ifdef CONFIG_BLK_DEV_INITRD
549 /* then reserve the initrd, if any */
550 if (initrd_start && (initrd_end > initrd_start))
551 memblock_reserve(__pa(initrd_start), initrd_end - initrd_start);
552 #endif /* CONFIG_BLK_DEV_INITRD */
556 * Handle the case where we might be booting from an old kexec
557 * image that setup the mem_rsvmap as pairs of 32-bit values
559 if (*reserve_map > 0xffffffffull) {
560 u32 base_32, size_32;
561 u32 *reserve_map_32 = (u32 *)reserve_map;
564 base_32 = *(reserve_map_32++);
565 size_32 = *(reserve_map_32++);
568 /* skip if the reservation is for the blob */
569 if (base_32 == self_base && size_32 == self_size)
571 DBG("reserving: %x -> %x\n", base_32, size_32);
572 memblock_reserve(base_32, size_32);
578 base = *(reserve_map++);
579 size = *(reserve_map++);
582 DBG("reserving: %llx -> %llx\n", base, size);
583 memblock_reserve(base, size);
587 #ifdef CONFIG_PHYP_DUMP
589 * phyp_dump_calculate_reserve_size() - reserve variable boot area 5% or arg
591 * Function to find the largest size we need to reserve
592 * during early boot process.
594 * It either looks for boot param and returns that OR
595 * returns larger of 256 or 5% rounded down to multiples of 256MB.
598 static inline unsigned long phyp_dump_calculate_reserve_size(void)
602 if (phyp_dump_info->reserve_bootvar)
603 return phyp_dump_info->reserve_bootvar;
605 /* divide by 20 to get 5% of value */
606 tmp = memblock_end_of_DRAM();
609 /* round it down in multiples of 256 */
610 tmp = tmp & ~0x0FFFFFFFUL;
612 return (tmp > PHYP_DUMP_RMR_END ? tmp : PHYP_DUMP_RMR_END);
616 * phyp_dump_reserve_mem() - reserve all not-yet-dumped mmemory
618 * This routine may reserve memory regions in the kernel only
619 * if the system is supported and a dump was taken in last
620 * boot instance or if the hardware is supported and the
621 * scratch area needs to be setup. In other instances it returns
622 * without reserving anything. The memory in case of dump being
623 * active is freed when the dump is collected (by userland tools).
625 static void __init phyp_dump_reserve_mem(void)
627 unsigned long base, size;
628 unsigned long variable_reserve_size;
630 if (!phyp_dump_info->phyp_dump_configured) {
631 printk(KERN_ERR "Phyp-dump not supported on this hardware\n");
635 if (!phyp_dump_info->phyp_dump_at_boot) {
636 printk(KERN_INFO "Phyp-dump disabled at boot time\n");
640 variable_reserve_size = phyp_dump_calculate_reserve_size();
642 if (phyp_dump_info->phyp_dump_is_active) {
643 /* Reserve *everything* above RMR.Area freed by userland tools*/
644 base = variable_reserve_size;
645 size = memblock_end_of_DRAM() - base;
647 /* XXX crashed_ram_end is wrong, since it may be beyond
648 * the memory_limit, it will need to be adjusted. */
649 memblock_reserve(base, size);
651 phyp_dump_info->init_reserve_start = base;
652 phyp_dump_info->init_reserve_size = size;
654 size = phyp_dump_info->cpu_state_size +
655 phyp_dump_info->hpte_region_size +
656 variable_reserve_size;
657 base = memblock_end_of_DRAM() - size;
658 memblock_reserve(base, size);
659 phyp_dump_info->init_reserve_start = base;
660 phyp_dump_info->init_reserve_size = size;
664 static inline void __init phyp_dump_reserve_mem(void) {}
665 #endif /* CONFIG_PHYP_DUMP && CONFIG_PPC_RTAS */
667 void __init early_init_devtree(void *params)
671 DBG(" -> early_init_devtree(%p)\n", params);
673 /* Setup flat device-tree pointer */
674 initial_boot_params = params;
676 #ifdef CONFIG_PPC_RTAS
677 /* Some machines might need RTAS info for debugging, grab it now. */
678 of_scan_flat_dt(early_init_dt_scan_rtas, NULL);
681 #ifdef CONFIG_PHYP_DUMP
682 /* scan tree to see if dump occurred during last boot */
683 of_scan_flat_dt(early_init_dt_scan_phyp_dump, NULL);
686 /* Retrieve various informations from the /chosen node of the
687 * device-tree, including the platform type, initrd location and
688 * size, TCE reserve, and more ...
690 of_scan_flat_dt(early_init_dt_scan_chosen_ppc, NULL);
692 /* Scan memory nodes and rebuild MEMBLOCKs */
695 of_scan_flat_dt(early_init_dt_scan_root, NULL);
696 of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
698 /* Save command line for /proc/cmdline and then parse parameters */
699 strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
702 /* Reserve MEMBLOCK regions used by kernel, initrd, dt, etc... */
703 memblock_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START);
704 /* If relocatable, reserve first 32k for interrupt vectors etc. */
705 if (PHYSICAL_START > MEMORY_START)
706 memblock_reserve(MEMORY_START, 0x8000);
707 reserve_kdump_trampoline();
708 reserve_crashkernel();
710 phyp_dump_reserve_mem();
712 limit = memory_limit;
716 /* Ensure that total memory size is page-aligned, because
717 * otherwise mark_bootmem() gets upset. */
719 memsize = memblock_phys_mem_size();
720 if ((memsize & PAGE_MASK) != memsize)
721 limit = memsize & PAGE_MASK;
723 memblock_enforce_memory_limit(limit);
728 DBG("Phys. mem: %llx\n", memblock_phys_mem_size());
730 /* We may need to relocate the flat tree, do it now.
731 * FIXME .. and the initrd too? */
736 DBG("Scanning CPUs ...\n");
738 /* Retrieve CPU related informations from the flat tree
739 * (altivec support, boot CPU ID, ...)
741 of_scan_flat_dt(early_init_dt_scan_cpus, NULL);
743 DBG(" <- early_init_devtree()\n");
748 * New implementation of the OF "find" APIs, return a refcounted
749 * object, call of_node_put() when done. The device tree and list
750 * are protected by a rw_lock.
752 * Note that property management will need some locking as well,
753 * this isn't dealt with yet.
758 * of_find_next_cache_node - Find a node's subsidiary cache
759 * @np: node of type "cpu" or "cache"
761 * Returns a node pointer with refcount incremented, use
762 * of_node_put() on it when done. Caller should hold a reference
765 struct device_node *of_find_next_cache_node(struct device_node *np)
767 struct device_node *child;
768 const phandle *handle;
770 handle = of_get_property(np, "l2-cache", NULL);
772 handle = of_get_property(np, "next-level-cache", NULL);
775 return of_find_node_by_phandle(*handle);
777 /* OF on pmac has nodes instead of properties named "l2-cache"
780 if (!strcmp(np->type, "cpu"))
781 for_each_child_of_node(np, child)
782 if (!strcmp(child->type, "cache"))
788 #ifdef CONFIG_PPC_PSERIES
790 * Fix up the uninitialized fields in a new device node:
791 * name, type and pci-specific fields
794 static int of_finish_dynamic_node(struct device_node *node)
796 struct device_node *parent = of_get_parent(node);
798 const phandle *ibm_phandle;
800 node->name = of_get_property(node, "name", NULL);
801 node->type = of_get_property(node, "device_type", NULL);
804 node->name = "<NULL>";
806 node->type = "<NULL>";
813 /* We don't support that function on PowerMac, at least
816 if (machine_is(powermac))
819 /* fix up new node's phandle field */
820 if ((ibm_phandle = of_get_property(node, "ibm,phandle", NULL)))
821 node->phandle = *ibm_phandle;
828 static int prom_reconfig_notifier(struct notifier_block *nb,
829 unsigned long action, void *node)
834 case PSERIES_RECONFIG_ADD:
835 err = of_finish_dynamic_node(node);
837 printk(KERN_ERR "finish_node returned %d\n", err);
848 static struct notifier_block prom_reconfig_nb = {
849 .notifier_call = prom_reconfig_notifier,
850 .priority = 10, /* This one needs to run first */
853 static int __init prom_reconfig_setup(void)
855 return pSeries_reconfig_notifier_register(&prom_reconfig_nb);
857 __initcall(prom_reconfig_setup);
860 /* Find the device node for a given logical cpu number, also returns the cpu
861 * local thread number (index in ibm,interrupt-server#s) if relevant and
862 * asked for (non NULL)
864 struct device_node *of_get_cpu_node(int cpu, unsigned int *thread)
867 struct device_node *np;
869 hardid = get_hard_smp_processor_id(cpu);
871 for_each_node_by_type(np, "cpu") {
873 unsigned int plen, t;
875 /* Check for ibm,ppc-interrupt-server#s. If it doesn't exist
876 * fallback to "reg" property and assume no threads
878 intserv = of_get_property(np, "ibm,ppc-interrupt-server#s",
880 if (intserv == NULL) {
881 const u32 *reg = of_get_property(np, "reg", NULL);
884 if (*reg == hardid) {
891 for (t = 0; t < plen; t++) {
892 if (hardid == intserv[t]) {
902 EXPORT_SYMBOL(of_get_cpu_node);
904 #if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
905 static struct debugfs_blob_wrapper flat_dt_blob;
907 static int __init export_flat_device_tree(void)
911 flat_dt_blob.data = initial_boot_params;
912 flat_dt_blob.size = initial_boot_params->totalsize;
914 d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
915 powerpc_debugfs_root, &flat_dt_blob);
921 __initcall(export_flat_device_tree);