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;
71 static phys_addr_t first_memblock_size;
73 static int __init early_parse_mem(char *p)
78 memory_limit = PAGE_ALIGN(memparse(p, &p));
79 DBG("memory limit = 0x%llx\n", (unsigned long long)memory_limit);
83 early_param("mem", early_parse_mem);
86 * move_device_tree - move tree to an unused area, if needed.
88 * The device tree may be allocated beyond our memory limit, or inside the
89 * crash kernel region for kdump. If so, move it out of the way.
91 static void __init move_device_tree(void)
93 unsigned long start, size;
96 DBG("-> move_device_tree\n");
98 start = __pa(initial_boot_params);
99 size = be32_to_cpu(initial_boot_params->totalsize);
101 if ((memory_limit && (start + size) > PHYSICAL_START + memory_limit) ||
102 overlaps_crashkernel(start, size)) {
103 p = __va(memblock_alloc(size, PAGE_SIZE));
104 memcpy(p, initial_boot_params, size);
105 initial_boot_params = (struct boot_param_header *)p;
106 DBG("Moved device tree to 0x%p\n", p);
109 DBG("<- move_device_tree\n");
113 * ibm,pa-features is a per-cpu property that contains a string of
114 * attribute descriptors, each of which has a 2 byte header plus up
115 * to 254 bytes worth of processor attribute bits. First header
116 * byte specifies the number of bytes following the header.
117 * Second header byte is an "attribute-specifier" type, of which
118 * zero is the only currently-defined value.
119 * Implementation: Pass in the byte and bit offset for the feature
120 * that we are interested in. The function will return -1 if the
121 * pa-features property is missing, or a 1/0 to indicate if the feature
122 * is supported/not supported. Note that the bit numbers are
123 * big-endian to match the definition in PAPR.
125 static struct ibm_pa_feature {
126 unsigned long cpu_features; /* CPU_FTR_xxx bit */
127 unsigned long mmu_features; /* MMU_FTR_xxx bit */
128 unsigned int cpu_user_ftrs; /* PPC_FEATURE_xxx bit */
129 unsigned char pabyte; /* byte number in ibm,pa-features */
130 unsigned char pabit; /* bit number (big-endian) */
131 unsigned char invert; /* if 1, pa bit set => clear feature */
132 } ibm_pa_features[] __initdata = {
133 {0, 0, PPC_FEATURE_HAS_MMU, 0, 0, 0},
134 {0, 0, PPC_FEATURE_HAS_FPU, 0, 1, 0},
135 {0, MMU_FTR_SLB, 0, 0, 2, 0},
136 {CPU_FTR_CTRL, 0, 0, 0, 3, 0},
137 {CPU_FTR_NOEXECUTE, 0, 0, 0, 6, 0},
138 {CPU_FTR_NODSISRALIGN, 0, 0, 1, 1, 1},
139 {0, MMU_FTR_CI_LARGE_PAGE, 0, 1, 2, 0},
140 {CPU_FTR_REAL_LE, PPC_FEATURE_TRUE_LE, 5, 0, 0},
143 static void __init scan_features(unsigned long node, unsigned char *ftrs,
144 unsigned long tablelen,
145 struct ibm_pa_feature *fp,
146 unsigned long ft_size)
148 unsigned long i, len, bit;
150 /* find descriptor with type == 0 */
156 return; /* descriptor 0 not found */
163 /* loop over bits we know about */
164 for (i = 0; i < ft_size; ++i, ++fp) {
165 if (fp->pabyte >= ftrs[0])
167 bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1;
168 if (bit ^ fp->invert) {
169 cur_cpu_spec->cpu_features |= fp->cpu_features;
170 cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs;
171 cur_cpu_spec->mmu_features |= fp->mmu_features;
173 cur_cpu_spec->cpu_features &= ~fp->cpu_features;
174 cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs;
175 cur_cpu_spec->mmu_features &= ~fp->mmu_features;
180 static void __init check_cpu_pa_features(unsigned long node)
182 unsigned char *pa_ftrs;
183 unsigned long tablelen;
185 pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen);
189 scan_features(node, pa_ftrs, tablelen,
190 ibm_pa_features, ARRAY_SIZE(ibm_pa_features));
193 #ifdef CONFIG_PPC_STD_MMU_64
194 static void __init check_cpu_slb_size(unsigned long node)
198 slb_size_ptr = of_get_flat_dt_prop(node, "slb-size", NULL);
199 if (slb_size_ptr != NULL) {
200 mmu_slb_size = *slb_size_ptr;
203 slb_size_ptr = of_get_flat_dt_prop(node, "ibm,slb-size", NULL);
204 if (slb_size_ptr != NULL) {
205 mmu_slb_size = *slb_size_ptr;
209 #define check_cpu_slb_size(node) do { } while(0)
212 static struct feature_property {
215 unsigned long cpu_feature;
216 unsigned long cpu_user_ftr;
217 } feature_properties[] __initdata = {
218 #ifdef CONFIG_ALTIVEC
219 {"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
220 {"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
221 #endif /* CONFIG_ALTIVEC */
223 /* Yes, this _really_ is ibm,vmx == 2 to enable VSX */
224 {"ibm,vmx", 2, CPU_FTR_VSX, PPC_FEATURE_HAS_VSX},
225 #endif /* CONFIG_VSX */
227 {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP},
228 {"ibm,purr", 1, CPU_FTR_PURR, 0},
229 {"ibm,spurr", 1, CPU_FTR_SPURR, 0},
230 #endif /* CONFIG_PPC64 */
233 #if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU)
234 static inline void identical_pvr_fixup(unsigned long node)
237 char *model = of_get_flat_dt_prop(node, "model", NULL);
240 * Since 440GR(x)/440EP(x) processors have the same pvr,
241 * we check the node path and set bit 28 in the cur_cpu_spec
242 * pvr for EP(x) processor version. This bit is always 0 in
243 * the "real" pvr. Then we call identify_cpu again with
244 * the new logical pvr to enable FPU support.
246 if (model && strstr(model, "440EP")) {
247 pvr = cur_cpu_spec->pvr_value | 0x8;
248 identify_cpu(0, pvr);
249 DBG("Using logical pvr %x for %s\n", pvr, model);
253 #define identical_pvr_fixup(node) do { } while(0)
256 static void __init check_cpu_feature_properties(unsigned long node)
259 struct feature_property *fp = feature_properties;
262 for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) {
263 prop = of_get_flat_dt_prop(node, fp->name, NULL);
264 if (prop && *prop >= fp->min_value) {
265 cur_cpu_spec->cpu_features |= fp->cpu_feature;
266 cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr;
271 static int __init early_init_dt_scan_cpus(unsigned long node,
272 const char *uname, int depth,
275 char *type = of_get_flat_dt_prop(node, "device_type", NULL);
282 /* We are scanning "cpu" nodes only */
283 if (type == NULL || strcmp(type, "cpu") != 0)
286 /* Get physical cpuid */
287 intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len);
289 nthreads = len / sizeof(int);
291 intserv = of_get_flat_dt_prop(node, "reg", NULL);
296 * Now see if any of these threads match our boot cpu.
297 * NOTE: This must match the parsing done in smp_setup_cpu_maps.
299 for (i = 0; i < nthreads; i++) {
301 * version 2 of the kexec param format adds the phys cpuid of
304 if (initial_boot_params && initial_boot_params->version >= 2) {
305 if (intserv[i] == initial_boot_params->boot_cpuid_phys)
306 found = boot_cpu_count;
309 * Check if it's the boot-cpu, set it's hw index now,
310 * unfortunately this format did not support booting
311 * off secondary threads.
313 if (of_get_flat_dt_prop(node,
314 "linux,boot-cpu", NULL) != NULL)
315 found = boot_cpu_count;
318 /* logical cpu id is always 0 on UP kernels */
324 DBG("boot cpu: logical %d physical %d\n", found,
327 set_hard_smp_processor_id(found, intserv[i]);
330 * PAPR defines "logical" PVR values for cpus that
331 * meet various levels of the architecture:
332 * 0x0f000001 Architecture version 2.04
333 * 0x0f000002 Architecture version 2.05
334 * If the cpu-version property in the cpu node contains
335 * such a value, we call identify_cpu again with the
336 * logical PVR value in order to use the cpu feature
337 * bits appropriate for the architecture level.
339 * A POWER6 partition in "POWER6 architected" mode
340 * uses the 0x0f000002 PVR value; in POWER5+ mode
341 * it uses 0x0f000001.
343 prop = of_get_flat_dt_prop(node, "cpu-version", NULL);
344 if (prop && (*prop & 0xff000000) == 0x0f000000)
345 identify_cpu(0, *prop);
347 identical_pvr_fixup(node);
350 check_cpu_feature_properties(node);
351 check_cpu_pa_features(node);
352 check_cpu_slb_size(node);
354 #ifdef CONFIG_PPC_PSERIES
356 cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
358 cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT;
364 int __init early_init_dt_scan_chosen_ppc(unsigned long node, const char *uname,
365 int depth, void *data)
367 unsigned long *lprop;
369 /* Use common scan routine to determine if this is the chosen node */
370 if (early_init_dt_scan_chosen(node, uname, depth, data) == 0)
374 /* check if iommu is forced on or off */
375 if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL)
377 if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL)
381 /* mem=x on the command line is the preferred mechanism */
382 lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL);
384 memory_limit = *lprop;
387 lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL);
389 tce_alloc_start = *lprop;
390 lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL);
392 tce_alloc_end = *lprop;
396 lprop = of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL);
398 crashk_res.start = *lprop;
400 lprop = of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL);
402 crashk_res.end = crashk_res.start + *lprop - 1;
409 #ifdef CONFIG_PPC_PSERIES
411 * Interpret the ibm,dynamic-memory property in the
412 * /ibm,dynamic-reconfiguration-memory node.
413 * This contains a list of memory blocks along with NUMA affinity
416 static int __init early_init_dt_scan_drconf_memory(unsigned long node)
418 __be32 *dm, *ls, *usm;
419 unsigned long l, n, flags;
420 u64 base, size, memblock_size;
421 unsigned int is_kexec_kdump = 0, rngs;
423 ls = of_get_flat_dt_prop(node, "ibm,lmb-size", &l);
424 if (ls == NULL || l < dt_root_size_cells * sizeof(__be32))
426 memblock_size = dt_mem_next_cell(dt_root_size_cells, &ls);
428 dm = of_get_flat_dt_prop(node, "ibm,dynamic-memory", &l);
429 if (dm == NULL || l < sizeof(__be32))
432 n = *dm++; /* number of entries */
433 if (l < (n * (dt_root_addr_cells + 4) + 1) * sizeof(__be32))
436 /* check if this is a kexec/kdump kernel. */
437 usm = of_get_flat_dt_prop(node, "linux,drconf-usable-memory",
442 for (; n != 0; --n) {
443 base = dt_mem_next_cell(dt_root_addr_cells, &dm);
445 /* skip DRC index, pad, assoc. list index, flags */
447 /* skip this block if the reserved bit is set in flags (0x80)
448 or if the block is not assigned to this partition (0x8) */
449 if ((flags & 0x80) || !(flags & 0x8))
451 size = memblock_size;
453 if (is_kexec_kdump) {
455 * For each memblock in ibm,dynamic-memory, a corresponding
456 * entry in linux,drconf-usable-memory property contains
457 * a counter 'p' followed by 'p' (base, size) duple.
458 * Now read the counter from
459 * linux,drconf-usable-memory property
461 rngs = dt_mem_next_cell(dt_root_size_cells, &usm);
462 if (!rngs) /* there are no (base, size) duple */
466 if (is_kexec_kdump) {
467 base = dt_mem_next_cell(dt_root_addr_cells,
469 size = dt_mem_next_cell(dt_root_size_cells,
473 if (base >= 0x80000000ul)
475 if ((base + size) > 0x80000000ul)
476 size = 0x80000000ul - base;
478 memblock_add(base, size);
485 #define early_init_dt_scan_drconf_memory(node) 0
486 #endif /* CONFIG_PPC_PSERIES */
488 static int __init early_init_dt_scan_memory_ppc(unsigned long node,
490 int depth, void *data)
493 strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0)
494 return early_init_dt_scan_drconf_memory(node);
496 return early_init_dt_scan_memory(node, uname, depth, data);
499 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
503 if (base >= 0x80000000ul)
505 if ((base + size) > 0x80000000ul)
506 size = 0x80000000ul - base;
509 /* Keep track of the beginning of memory -and- the size of
510 * the very first block in the device-tree as it represents
511 * the RMA on ppc64 server
513 if (base < memstart_addr) {
514 memstart_addr = base;
515 first_memblock_size = size;
518 /* Add the chunk to the MEMBLOCK list */
519 memblock_add(base, size);
522 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
524 return __va(memblock_alloc(size, align));
527 #ifdef CONFIG_BLK_DEV_INITRD
528 void __init early_init_dt_setup_initrd_arch(unsigned long start,
531 initrd_start = (unsigned long)__va(start);
532 initrd_end = (unsigned long)__va(end);
533 initrd_below_start_ok = 1;
537 static void __init early_reserve_mem(void)
541 unsigned long self_base;
542 unsigned long self_size;
544 reserve_map = (u64 *)(((unsigned long)initial_boot_params) +
545 initial_boot_params->off_mem_rsvmap);
547 /* before we do anything, lets reserve the dt blob */
548 self_base = __pa((unsigned long)initial_boot_params);
549 self_size = initial_boot_params->totalsize;
550 memblock_reserve(self_base, self_size);
552 #ifdef CONFIG_BLK_DEV_INITRD
553 /* then reserve the initrd, if any */
554 if (initrd_start && (initrd_end > initrd_start))
555 memblock_reserve(__pa(initrd_start), initrd_end - initrd_start);
556 #endif /* CONFIG_BLK_DEV_INITRD */
560 * Handle the case where we might be booting from an old kexec
561 * image that setup the mem_rsvmap as pairs of 32-bit values
563 if (*reserve_map > 0xffffffffull) {
564 u32 base_32, size_32;
565 u32 *reserve_map_32 = (u32 *)reserve_map;
568 base_32 = *(reserve_map_32++);
569 size_32 = *(reserve_map_32++);
572 /* skip if the reservation is for the blob */
573 if (base_32 == self_base && size_32 == self_size)
575 DBG("reserving: %x -> %x\n", base_32, size_32);
576 memblock_reserve(base_32, size_32);
582 base = *(reserve_map++);
583 size = *(reserve_map++);
586 DBG("reserving: %llx -> %llx\n", base, size);
587 memblock_reserve(base, size);
591 #ifdef CONFIG_PHYP_DUMP
593 * phyp_dump_calculate_reserve_size() - reserve variable boot area 5% or arg
595 * Function to find the largest size we need to reserve
596 * during early boot process.
598 * It either looks for boot param and returns that OR
599 * returns larger of 256 or 5% rounded down to multiples of 256MB.
602 static inline unsigned long phyp_dump_calculate_reserve_size(void)
606 if (phyp_dump_info->reserve_bootvar)
607 return phyp_dump_info->reserve_bootvar;
609 /* divide by 20 to get 5% of value */
610 tmp = memblock_end_of_DRAM();
613 /* round it down in multiples of 256 */
614 tmp = tmp & ~0x0FFFFFFFUL;
616 return (tmp > PHYP_DUMP_RMR_END ? tmp : PHYP_DUMP_RMR_END);
620 * phyp_dump_reserve_mem() - reserve all not-yet-dumped mmemory
622 * This routine may reserve memory regions in the kernel only
623 * if the system is supported and a dump was taken in last
624 * boot instance or if the hardware is supported and the
625 * scratch area needs to be setup. In other instances it returns
626 * without reserving anything. The memory in case of dump being
627 * active is freed when the dump is collected (by userland tools).
629 static void __init phyp_dump_reserve_mem(void)
631 unsigned long base, size;
632 unsigned long variable_reserve_size;
634 if (!phyp_dump_info->phyp_dump_configured) {
635 printk(KERN_ERR "Phyp-dump not supported on this hardware\n");
639 if (!phyp_dump_info->phyp_dump_at_boot) {
640 printk(KERN_INFO "Phyp-dump disabled at boot time\n");
644 variable_reserve_size = phyp_dump_calculate_reserve_size();
646 if (phyp_dump_info->phyp_dump_is_active) {
647 /* Reserve *everything* above RMR.Area freed by userland tools*/
648 base = variable_reserve_size;
649 size = memblock_end_of_DRAM() - base;
651 /* XXX crashed_ram_end is wrong, since it may be beyond
652 * the memory_limit, it will need to be adjusted. */
653 memblock_reserve(base, size);
655 phyp_dump_info->init_reserve_start = base;
656 phyp_dump_info->init_reserve_size = size;
658 size = phyp_dump_info->cpu_state_size +
659 phyp_dump_info->hpte_region_size +
660 variable_reserve_size;
661 base = memblock_end_of_DRAM() - size;
662 memblock_reserve(base, size);
663 phyp_dump_info->init_reserve_start = base;
664 phyp_dump_info->init_reserve_size = size;
668 static inline void __init phyp_dump_reserve_mem(void) {}
669 #endif /* CONFIG_PHYP_DUMP && CONFIG_PPC_RTAS */
671 void __init early_init_devtree(void *params)
675 DBG(" -> early_init_devtree(%p)\n", params);
677 /* Setup flat device-tree pointer */
678 initial_boot_params = params;
680 #ifdef CONFIG_PPC_RTAS
681 /* Some machines might need RTAS info for debugging, grab it now. */
682 of_scan_flat_dt(early_init_dt_scan_rtas, NULL);
685 #ifdef CONFIG_PHYP_DUMP
686 /* scan tree to see if dump occurred during last boot */
687 of_scan_flat_dt(early_init_dt_scan_phyp_dump, NULL);
690 /* Retrieve various informations from the /chosen node of the
691 * device-tree, including the platform type, initrd location and
692 * size, TCE reserve, and more ...
694 of_scan_flat_dt(early_init_dt_scan_chosen_ppc, NULL);
696 /* Scan memory nodes and rebuild MEMBLOCKs */
699 of_scan_flat_dt(early_init_dt_scan_root, NULL);
700 of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
701 setup_initial_memory_limit(memstart_addr, first_memblock_size);
703 /* Save command line for /proc/cmdline and then parse parameters */
704 strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
707 /* Reserve MEMBLOCK regions used by kernel, initrd, dt, etc... */
708 memblock_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START);
709 /* If relocatable, reserve first 32k for interrupt vectors etc. */
710 if (PHYSICAL_START > MEMORY_START)
711 memblock_reserve(MEMORY_START, 0x8000);
712 reserve_kdump_trampoline();
713 reserve_crashkernel();
715 phyp_dump_reserve_mem();
717 limit = memory_limit;
721 /* Ensure that total memory size is page-aligned, because
722 * otherwise mark_bootmem() gets upset. */
724 memsize = memblock_phys_mem_size();
725 if ((memsize & PAGE_MASK) != memsize)
726 limit = memsize & PAGE_MASK;
728 memblock_enforce_memory_limit(limit);
733 DBG("Phys. mem: %llx\n", memblock_phys_mem_size());
735 /* We may need to relocate the flat tree, do it now.
736 * FIXME .. and the initrd too? */
741 DBG("Scanning CPUs ...\n");
743 /* Retrieve CPU related informations from the flat tree
744 * (altivec support, boot CPU ID, ...)
746 of_scan_flat_dt(early_init_dt_scan_cpus, NULL);
748 DBG(" <- early_init_devtree()\n");
753 * New implementation of the OF "find" APIs, return a refcounted
754 * object, call of_node_put() when done. The device tree and list
755 * are protected by a rw_lock.
757 * Note that property management will need some locking as well,
758 * this isn't dealt with yet.
763 * of_find_next_cache_node - Find a node's subsidiary cache
764 * @np: node of type "cpu" or "cache"
766 * Returns a node pointer with refcount incremented, use
767 * of_node_put() on it when done. Caller should hold a reference
770 struct device_node *of_find_next_cache_node(struct device_node *np)
772 struct device_node *child;
773 const phandle *handle;
775 handle = of_get_property(np, "l2-cache", NULL);
777 handle = of_get_property(np, "next-level-cache", NULL);
780 return of_find_node_by_phandle(*handle);
782 /* OF on pmac has nodes instead of properties named "l2-cache"
785 if (!strcmp(np->type, "cpu"))
786 for_each_child_of_node(np, child)
787 if (!strcmp(child->type, "cache"))
793 #ifdef CONFIG_PPC_PSERIES
795 * Fix up the uninitialized fields in a new device node:
796 * name, type and pci-specific fields
799 static int of_finish_dynamic_node(struct device_node *node)
801 struct device_node *parent = of_get_parent(node);
803 const phandle *ibm_phandle;
805 node->name = of_get_property(node, "name", NULL);
806 node->type = of_get_property(node, "device_type", NULL);
809 node->name = "<NULL>";
811 node->type = "<NULL>";
818 /* We don't support that function on PowerMac, at least
821 if (machine_is(powermac))
824 /* fix up new node's phandle field */
825 if ((ibm_phandle = of_get_property(node, "ibm,phandle", NULL)))
826 node->phandle = *ibm_phandle;
833 static int prom_reconfig_notifier(struct notifier_block *nb,
834 unsigned long action, void *node)
839 case PSERIES_RECONFIG_ADD:
840 err = of_finish_dynamic_node(node);
842 printk(KERN_ERR "finish_node returned %d\n", err);
853 static struct notifier_block prom_reconfig_nb = {
854 .notifier_call = prom_reconfig_notifier,
855 .priority = 10, /* This one needs to run first */
858 static int __init prom_reconfig_setup(void)
860 return pSeries_reconfig_notifier_register(&prom_reconfig_nb);
862 __initcall(prom_reconfig_setup);
865 /* Find the device node for a given logical cpu number, also returns the cpu
866 * local thread number (index in ibm,interrupt-server#s) if relevant and
867 * asked for (non NULL)
869 struct device_node *of_get_cpu_node(int cpu, unsigned int *thread)
872 struct device_node *np;
874 hardid = get_hard_smp_processor_id(cpu);
876 for_each_node_by_type(np, "cpu") {
878 unsigned int plen, t;
880 /* Check for ibm,ppc-interrupt-server#s. If it doesn't exist
881 * fallback to "reg" property and assume no threads
883 intserv = of_get_property(np, "ibm,ppc-interrupt-server#s",
885 if (intserv == NULL) {
886 const u32 *reg = of_get_property(np, "reg", NULL);
889 if (*reg == hardid) {
896 for (t = 0; t < plen; t++) {
897 if (hardid == intserv[t]) {
907 EXPORT_SYMBOL(of_get_cpu_node);
909 #if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
910 static struct debugfs_blob_wrapper flat_dt_blob;
912 static int __init export_flat_device_tree(void)
916 flat_dt_blob.data = initial_boot_params;
917 flat_dt_blob.size = initial_boot_params->totalsize;
919 d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
920 powerpc_debugfs_root, &flat_dt_blob);
926 __initcall(export_flat_device_tree);