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 int cpu_user_ftrs; /* PPC_FEATURE_xxx bit */
127 unsigned char pabyte; /* byte number in ibm,pa-features */
128 unsigned char pabit; /* bit number (big-endian) */
129 unsigned char invert; /* if 1, pa bit set => clear feature */
130 } ibm_pa_features[] __initdata = {
131 {0, PPC_FEATURE_HAS_MMU, 0, 0, 0},
132 {0, PPC_FEATURE_HAS_FPU, 0, 1, 0},
133 {CPU_FTR_SLB, 0, 0, 2, 0},
134 {CPU_FTR_CTRL, 0, 0, 3, 0},
135 {CPU_FTR_NOEXECUTE, 0, 0, 6, 0},
136 {CPU_FTR_NODSISRALIGN, 0, 1, 1, 1},
137 {CPU_FTR_CI_LARGE_PAGE, 0, 1, 2, 0},
138 {CPU_FTR_REAL_LE, PPC_FEATURE_TRUE_LE, 5, 0, 0},
141 static void __init scan_features(unsigned long node, unsigned char *ftrs,
142 unsigned long tablelen,
143 struct ibm_pa_feature *fp,
144 unsigned long ft_size)
146 unsigned long i, len, bit;
148 /* find descriptor with type == 0 */
154 return; /* descriptor 0 not found */
161 /* loop over bits we know about */
162 for (i = 0; i < ft_size; ++i, ++fp) {
163 if (fp->pabyte >= ftrs[0])
165 bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1;
166 if (bit ^ fp->invert) {
167 cur_cpu_spec->cpu_features |= fp->cpu_features;
168 cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs;
170 cur_cpu_spec->cpu_features &= ~fp->cpu_features;
171 cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs;
176 static void __init check_cpu_pa_features(unsigned long node)
178 unsigned char *pa_ftrs;
179 unsigned long tablelen;
181 pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen);
185 scan_features(node, pa_ftrs, tablelen,
186 ibm_pa_features, ARRAY_SIZE(ibm_pa_features));
189 #ifdef CONFIG_PPC_STD_MMU_64
190 static void __init check_cpu_slb_size(unsigned long node)
194 slb_size_ptr = of_get_flat_dt_prop(node, "slb-size", NULL);
195 if (slb_size_ptr != NULL) {
196 mmu_slb_size = *slb_size_ptr;
199 slb_size_ptr = of_get_flat_dt_prop(node, "ibm,slb-size", NULL);
200 if (slb_size_ptr != NULL) {
201 mmu_slb_size = *slb_size_ptr;
205 #define check_cpu_slb_size(node) do { } while(0)
208 static struct feature_property {
211 unsigned long cpu_feature;
212 unsigned long cpu_user_ftr;
213 } feature_properties[] __initdata = {
214 #ifdef CONFIG_ALTIVEC
215 {"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
216 {"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
217 #endif /* CONFIG_ALTIVEC */
219 /* Yes, this _really_ is ibm,vmx == 2 to enable VSX */
220 {"ibm,vmx", 2, CPU_FTR_VSX, PPC_FEATURE_HAS_VSX},
221 #endif /* CONFIG_VSX */
223 {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP},
224 {"ibm,purr", 1, CPU_FTR_PURR, 0},
225 {"ibm,spurr", 1, CPU_FTR_SPURR, 0},
226 #endif /* CONFIG_PPC64 */
229 #if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU)
230 static inline void identical_pvr_fixup(unsigned long node)
233 char *model = of_get_flat_dt_prop(node, "model", NULL);
236 * Since 440GR(x)/440EP(x) processors have the same pvr,
237 * we check the node path and set bit 28 in the cur_cpu_spec
238 * pvr for EP(x) processor version. This bit is always 0 in
239 * the "real" pvr. Then we call identify_cpu again with
240 * the new logical pvr to enable FPU support.
242 if (model && strstr(model, "440EP")) {
243 pvr = cur_cpu_spec->pvr_value | 0x8;
244 identify_cpu(0, pvr);
245 DBG("Using logical pvr %x for %s\n", pvr, model);
249 #define identical_pvr_fixup(node) do { } while(0)
252 static void __init check_cpu_feature_properties(unsigned long node)
255 struct feature_property *fp = feature_properties;
258 for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) {
259 prop = of_get_flat_dt_prop(node, fp->name, NULL);
260 if (prop && *prop >= fp->min_value) {
261 cur_cpu_spec->cpu_features |= fp->cpu_feature;
262 cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr;
267 static int __init early_init_dt_scan_cpus(unsigned long node,
268 const char *uname, int depth,
271 char *type = of_get_flat_dt_prop(node, "device_type", NULL);
278 /* We are scanning "cpu" nodes only */
279 if (type == NULL || strcmp(type, "cpu") != 0)
282 /* Get physical cpuid */
283 intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len);
285 nthreads = len / sizeof(int);
287 intserv = of_get_flat_dt_prop(node, "reg", NULL);
292 * Now see if any of these threads match our boot cpu.
293 * NOTE: This must match the parsing done in smp_setup_cpu_maps.
295 for (i = 0; i < nthreads; i++) {
297 * version 2 of the kexec param format adds the phys cpuid of
300 if (initial_boot_params && initial_boot_params->version >= 2) {
301 if (intserv[i] == initial_boot_params->boot_cpuid_phys)
302 found = boot_cpu_count;
305 * Check if it's the boot-cpu, set it's hw index now,
306 * unfortunately this format did not support booting
307 * off secondary threads.
309 if (of_get_flat_dt_prop(node,
310 "linux,boot-cpu", NULL) != NULL)
311 found = boot_cpu_count;
314 /* logical cpu id is always 0 on UP kernels */
320 DBG("boot cpu: logical %d physical %d\n", found,
323 set_hard_smp_processor_id(found, intserv[i]);
326 * PAPR defines "logical" PVR values for cpus that
327 * meet various levels of the architecture:
328 * 0x0f000001 Architecture version 2.04
329 * 0x0f000002 Architecture version 2.05
330 * If the cpu-version property in the cpu node contains
331 * such a value, we call identify_cpu again with the
332 * logical PVR value in order to use the cpu feature
333 * bits appropriate for the architecture level.
335 * A POWER6 partition in "POWER6 architected" mode
336 * uses the 0x0f000002 PVR value; in POWER5+ mode
337 * it uses 0x0f000001.
339 prop = of_get_flat_dt_prop(node, "cpu-version", NULL);
340 if (prop && (*prop & 0xff000000) == 0x0f000000)
341 identify_cpu(0, *prop);
343 identical_pvr_fixup(node);
346 check_cpu_feature_properties(node);
347 check_cpu_pa_features(node);
348 check_cpu_slb_size(node);
350 #ifdef CONFIG_PPC_PSERIES
352 cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
354 cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT;
360 int __init early_init_dt_scan_chosen_ppc(unsigned long node, const char *uname,
361 int depth, void *data)
363 unsigned long *lprop;
365 /* Use common scan routine to determine if this is the chosen node */
366 if (early_init_dt_scan_chosen(node, uname, depth, data) == 0)
370 /* check if iommu is forced on or off */
371 if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL)
373 if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL)
377 /* mem=x on the command line is the preferred mechanism */
378 lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL);
380 memory_limit = *lprop;
383 lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL);
385 tce_alloc_start = *lprop;
386 lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL);
388 tce_alloc_end = *lprop;
392 lprop = of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL);
394 crashk_res.start = *lprop;
396 lprop = of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL);
398 crashk_res.end = crashk_res.start + *lprop - 1;
405 #ifdef CONFIG_PPC_PSERIES
407 * Interpret the ibm,dynamic-memory property in the
408 * /ibm,dynamic-reconfiguration-memory node.
409 * This contains a list of memory blocks along with NUMA affinity
412 static int __init early_init_dt_scan_drconf_memory(unsigned long node)
414 __be32 *dm, *ls, *usm;
415 unsigned long l, n, flags;
416 u64 base, size, memblock_size;
417 unsigned int is_kexec_kdump = 0, rngs;
419 ls = of_get_flat_dt_prop(node, "ibm,lmb-size", &l);
420 if (ls == NULL || l < dt_root_size_cells * sizeof(__be32))
422 memblock_size = dt_mem_next_cell(dt_root_size_cells, &ls);
424 dm = of_get_flat_dt_prop(node, "ibm,dynamic-memory", &l);
425 if (dm == NULL || l < sizeof(__be32))
428 n = *dm++; /* number of entries */
429 if (l < (n * (dt_root_addr_cells + 4) + 1) * sizeof(__be32))
432 /* check if this is a kexec/kdump kernel. */
433 usm = of_get_flat_dt_prop(node, "linux,drconf-usable-memory",
438 for (; n != 0; --n) {
439 base = dt_mem_next_cell(dt_root_addr_cells, &dm);
441 /* skip DRC index, pad, assoc. list index, flags */
443 /* skip this block if the reserved bit is set in flags (0x80)
444 or if the block is not assigned to this partition (0x8) */
445 if ((flags & 0x80) || !(flags & 0x8))
447 size = memblock_size;
449 if (is_kexec_kdump) {
451 * For each memblock in ibm,dynamic-memory, a corresponding
452 * entry in linux,drconf-usable-memory property contains
453 * a counter 'p' followed by 'p' (base, size) duple.
454 * Now read the counter from
455 * linux,drconf-usable-memory property
457 rngs = dt_mem_next_cell(dt_root_size_cells, &usm);
458 if (!rngs) /* there are no (base, size) duple */
462 if (is_kexec_kdump) {
463 base = dt_mem_next_cell(dt_root_addr_cells,
465 size = dt_mem_next_cell(dt_root_size_cells,
469 if (base >= 0x80000000ul)
471 if ((base + size) > 0x80000000ul)
472 size = 0x80000000ul - base;
474 memblock_add(base, size);
481 #define early_init_dt_scan_drconf_memory(node) 0
482 #endif /* CONFIG_PPC_PSERIES */
484 static int __init early_init_dt_scan_memory_ppc(unsigned long node,
486 int depth, void *data)
489 strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0)
490 return early_init_dt_scan_drconf_memory(node);
492 return early_init_dt_scan_memory(node, uname, depth, data);
495 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
499 if (base >= 0x80000000ul)
501 if ((base + size) > 0x80000000ul)
502 size = 0x80000000ul - base;
506 /* First MEMBLOCK added, do some special initializations */
507 if (memstart_addr == ~(phys_addr_t)0)
508 setup_initial_memory_limit(base, size);
509 memstart_addr = min((u64)memstart_addr, base);
511 /* Add the chunk to the MEMBLOCK list */
512 memblock_add(base, size);
515 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
517 return __va(memblock_alloc(size, align));
520 #ifdef CONFIG_BLK_DEV_INITRD
521 void __init early_init_dt_setup_initrd_arch(unsigned long start,
524 initrd_start = (unsigned long)__va(start);
525 initrd_end = (unsigned long)__va(end);
526 initrd_below_start_ok = 1;
530 static void __init early_reserve_mem(void)
534 unsigned long self_base;
535 unsigned long self_size;
537 reserve_map = (u64 *)(((unsigned long)initial_boot_params) +
538 initial_boot_params->off_mem_rsvmap);
540 /* before we do anything, lets reserve the dt blob */
541 self_base = __pa((unsigned long)initial_boot_params);
542 self_size = initial_boot_params->totalsize;
543 memblock_reserve(self_base, self_size);
545 #ifdef CONFIG_BLK_DEV_INITRD
546 /* then reserve the initrd, if any */
547 if (initrd_start && (initrd_end > initrd_start))
548 memblock_reserve(__pa(initrd_start), initrd_end - initrd_start);
549 #endif /* CONFIG_BLK_DEV_INITRD */
553 * Handle the case where we might be booting from an old kexec
554 * image that setup the mem_rsvmap as pairs of 32-bit values
556 if (*reserve_map > 0xffffffffull) {
557 u32 base_32, size_32;
558 u32 *reserve_map_32 = (u32 *)reserve_map;
561 base_32 = *(reserve_map_32++);
562 size_32 = *(reserve_map_32++);
565 /* skip if the reservation is for the blob */
566 if (base_32 == self_base && size_32 == self_size)
568 DBG("reserving: %x -> %x\n", base_32, size_32);
569 memblock_reserve(base_32, size_32);
575 base = *(reserve_map++);
576 size = *(reserve_map++);
579 DBG("reserving: %llx -> %llx\n", base, size);
580 memblock_reserve(base, size);
584 #ifdef CONFIG_PHYP_DUMP
586 * phyp_dump_calculate_reserve_size() - reserve variable boot area 5% or arg
588 * Function to find the largest size we need to reserve
589 * during early boot process.
591 * It either looks for boot param and returns that OR
592 * returns larger of 256 or 5% rounded down to multiples of 256MB.
595 static inline unsigned long phyp_dump_calculate_reserve_size(void)
599 if (phyp_dump_info->reserve_bootvar)
600 return phyp_dump_info->reserve_bootvar;
602 /* divide by 20 to get 5% of value */
603 tmp = memblock_end_of_DRAM();
606 /* round it down in multiples of 256 */
607 tmp = tmp & ~0x0FFFFFFFUL;
609 return (tmp > PHYP_DUMP_RMR_END ? tmp : PHYP_DUMP_RMR_END);
613 * phyp_dump_reserve_mem() - reserve all not-yet-dumped mmemory
615 * This routine may reserve memory regions in the kernel only
616 * if the system is supported and a dump was taken in last
617 * boot instance or if the hardware is supported and the
618 * scratch area needs to be setup. In other instances it returns
619 * without reserving anything. The memory in case of dump being
620 * active is freed when the dump is collected (by userland tools).
622 static void __init phyp_dump_reserve_mem(void)
624 unsigned long base, size;
625 unsigned long variable_reserve_size;
627 if (!phyp_dump_info->phyp_dump_configured) {
628 printk(KERN_ERR "Phyp-dump not supported on this hardware\n");
632 if (!phyp_dump_info->phyp_dump_at_boot) {
633 printk(KERN_INFO "Phyp-dump disabled at boot time\n");
637 variable_reserve_size = phyp_dump_calculate_reserve_size();
639 if (phyp_dump_info->phyp_dump_is_active) {
640 /* Reserve *everything* above RMR.Area freed by userland tools*/
641 base = variable_reserve_size;
642 size = memblock_end_of_DRAM() - base;
644 /* XXX crashed_ram_end is wrong, since it may be beyond
645 * the memory_limit, it will need to be adjusted. */
646 memblock_reserve(base, size);
648 phyp_dump_info->init_reserve_start = base;
649 phyp_dump_info->init_reserve_size = size;
651 size = phyp_dump_info->cpu_state_size +
652 phyp_dump_info->hpte_region_size +
653 variable_reserve_size;
654 base = memblock_end_of_DRAM() - size;
655 memblock_reserve(base, size);
656 phyp_dump_info->init_reserve_start = base;
657 phyp_dump_info->init_reserve_size = size;
661 static inline void __init phyp_dump_reserve_mem(void) {}
662 #endif /* CONFIG_PHYP_DUMP && CONFIG_PPC_RTAS */
664 void __init early_init_devtree(void *params)
668 DBG(" -> early_init_devtree(%p)\n", params);
670 /* Setup flat device-tree pointer */
671 initial_boot_params = params;
673 #ifdef CONFIG_PPC_RTAS
674 /* Some machines might need RTAS info for debugging, grab it now. */
675 of_scan_flat_dt(early_init_dt_scan_rtas, NULL);
678 #ifdef CONFIG_PHYP_DUMP
679 /* scan tree to see if dump occurred during last boot */
680 of_scan_flat_dt(early_init_dt_scan_phyp_dump, NULL);
683 /* Retrieve various informations from the /chosen node of the
684 * device-tree, including the platform type, initrd location and
685 * size, TCE reserve, and more ...
687 of_scan_flat_dt(early_init_dt_scan_chosen_ppc, NULL);
689 /* Scan memory nodes and rebuild MEMBLOCKs */
692 of_scan_flat_dt(early_init_dt_scan_root, NULL);
693 of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
695 /* Save command line for /proc/cmdline and then parse parameters */
696 strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
699 /* Reserve MEMBLOCK regions used by kernel, initrd, dt, etc... */
700 memblock_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START);
701 /* If relocatable, reserve first 32k for interrupt vectors etc. */
702 if (PHYSICAL_START > MEMORY_START)
703 memblock_reserve(MEMORY_START, 0x8000);
704 reserve_kdump_trampoline();
705 reserve_crashkernel();
707 phyp_dump_reserve_mem();
709 limit = memory_limit;
713 /* Ensure that total memory size is page-aligned, because
714 * otherwise mark_bootmem() gets upset. */
716 memsize = memblock_phys_mem_size();
717 if ((memsize & PAGE_MASK) != memsize)
718 limit = memsize & PAGE_MASK;
720 memblock_enforce_memory_limit(limit);
725 DBG("Phys. mem: %llx\n", memblock_phys_mem_size());
727 /* We may need to relocate the flat tree, do it now.
728 * FIXME .. and the initrd too? */
733 DBG("Scanning CPUs ...\n");
735 /* Retrieve CPU related informations from the flat tree
736 * (altivec support, boot CPU ID, ...)
738 of_scan_flat_dt(early_init_dt_scan_cpus, NULL);
740 DBG(" <- early_init_devtree()\n");
745 * New implementation of the OF "find" APIs, return a refcounted
746 * object, call of_node_put() when done. The device tree and list
747 * are protected by a rw_lock.
749 * Note that property management will need some locking as well,
750 * this isn't dealt with yet.
755 * of_find_next_cache_node - Find a node's subsidiary cache
756 * @np: node of type "cpu" or "cache"
758 * Returns a node pointer with refcount incremented, use
759 * of_node_put() on it when done. Caller should hold a reference
762 struct device_node *of_find_next_cache_node(struct device_node *np)
764 struct device_node *child;
765 const phandle *handle;
767 handle = of_get_property(np, "l2-cache", NULL);
769 handle = of_get_property(np, "next-level-cache", NULL);
772 return of_find_node_by_phandle(*handle);
774 /* OF on pmac has nodes instead of properties named "l2-cache"
777 if (!strcmp(np->type, "cpu"))
778 for_each_child_of_node(np, child)
779 if (!strcmp(child->type, "cache"))
785 #ifdef CONFIG_PPC_PSERIES
787 * Fix up the uninitialized fields in a new device node:
788 * name, type and pci-specific fields
791 static int of_finish_dynamic_node(struct device_node *node)
793 struct device_node *parent = of_get_parent(node);
795 const phandle *ibm_phandle;
797 node->name = of_get_property(node, "name", NULL);
798 node->type = of_get_property(node, "device_type", NULL);
801 node->name = "<NULL>";
803 node->type = "<NULL>";
810 /* We don't support that function on PowerMac, at least
813 if (machine_is(powermac))
816 /* fix up new node's phandle field */
817 if ((ibm_phandle = of_get_property(node, "ibm,phandle", NULL)))
818 node->phandle = *ibm_phandle;
825 static int prom_reconfig_notifier(struct notifier_block *nb,
826 unsigned long action, void *node)
831 case PSERIES_RECONFIG_ADD:
832 err = of_finish_dynamic_node(node);
834 printk(KERN_ERR "finish_node returned %d\n", err);
845 static struct notifier_block prom_reconfig_nb = {
846 .notifier_call = prom_reconfig_notifier,
847 .priority = 10, /* This one needs to run first */
850 static int __init prom_reconfig_setup(void)
852 return pSeries_reconfig_notifier_register(&prom_reconfig_nb);
854 __initcall(prom_reconfig_setup);
857 /* Find the device node for a given logical cpu number, also returns the cpu
858 * local thread number (index in ibm,interrupt-server#s) if relevant and
859 * asked for (non NULL)
861 struct device_node *of_get_cpu_node(int cpu, unsigned int *thread)
864 struct device_node *np;
866 hardid = get_hard_smp_processor_id(cpu);
868 for_each_node_by_type(np, "cpu") {
870 unsigned int plen, t;
872 /* Check for ibm,ppc-interrupt-server#s. If it doesn't exist
873 * fallback to "reg" property and assume no threads
875 intserv = of_get_property(np, "ibm,ppc-interrupt-server#s",
877 if (intserv == NULL) {
878 const u32 *reg = of_get_property(np, "reg", NULL);
881 if (*reg == hardid) {
888 for (t = 0; t < plen; t++) {
889 if (hardid == intserv[t]) {
899 EXPORT_SYMBOL(of_get_cpu_node);
901 #if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
902 static struct debugfs_blob_wrapper flat_dt_blob;
904 static int __init export_flat_device_tree(void)
908 flat_dt_blob.data = initial_boot_params;
909 flat_dt_blob.size = initial_boot_params->totalsize;
911 d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
912 powerpc_debugfs_root, &flat_dt_blob);
918 __initcall(export_flat_device_tree);