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/debugfs.h>
33 #include <linux/irq.h>
34 #include <linux/memblock.h>
40 #include <asm/processor.h>
43 #include <asm/kdump.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/pci-bridge.h>
54 #include <asm/kexec.h>
56 #include <asm/fadump.h>
57 #include <asm/debug.h>
59 #include <mm/mmu_decl.h>
62 #define DBG(fmt...) printk(KERN_ERR fmt)
68 int __initdata iommu_is_off;
69 int __initdata iommu_force_on;
70 unsigned long tce_alloc_start, tce_alloc_end;
73 static phys_addr_t first_memblock_size;
74 static int __initdata boot_cpu_count;
76 static int __init early_parse_mem(char *p)
81 memory_limit = PAGE_ALIGN(memparse(p, &p));
82 DBG("memory limit = 0x%llx\n", memory_limit);
86 early_param("mem", early_parse_mem);
89 * overlaps_initrd - check for overlap with page aligned extension of
92 static inline int overlaps_initrd(unsigned long start, unsigned long size)
94 #ifdef CONFIG_BLK_DEV_INITRD
98 return (start + size) > _ALIGN_DOWN(initrd_start, PAGE_SIZE) &&
99 start <= _ALIGN_UP(initrd_end, PAGE_SIZE);
106 * move_device_tree - move tree to an unused area, if needed.
108 * The device tree may be allocated beyond our memory limit, or inside the
109 * crash kernel region for kdump, or within the page aligned range of initrd.
110 * If so, move it out of the way.
112 static void __init move_device_tree(void)
114 unsigned long start, size;
117 DBG("-> move_device_tree\n");
119 start = __pa(initial_boot_params);
120 size = be32_to_cpu(initial_boot_params->totalsize);
122 if ((memory_limit && (start + size) > PHYSICAL_START + memory_limit) ||
123 overlaps_crashkernel(start, size) ||
124 overlaps_initrd(start, size)) {
125 p = __va(memblock_alloc(size, PAGE_SIZE));
126 memcpy(p, initial_boot_params, size);
127 initial_boot_params = (struct boot_param_header *)p;
128 DBG("Moved device tree to 0x%p\n", p);
131 DBG("<- move_device_tree\n");
135 * ibm,pa-features is a per-cpu property that contains a string of
136 * attribute descriptors, each of which has a 2 byte header plus up
137 * to 254 bytes worth of processor attribute bits. First header
138 * byte specifies the number of bytes following the header.
139 * Second header byte is an "attribute-specifier" type, of which
140 * zero is the only currently-defined value.
141 * Implementation: Pass in the byte and bit offset for the feature
142 * that we are interested in. The function will return -1 if the
143 * pa-features property is missing, or a 1/0 to indicate if the feature
144 * is supported/not supported. Note that the bit numbers are
145 * big-endian to match the definition in PAPR.
147 static struct ibm_pa_feature {
148 unsigned long cpu_features; /* CPU_FTR_xxx bit */
149 unsigned long mmu_features; /* MMU_FTR_xxx bit */
150 unsigned int cpu_user_ftrs; /* PPC_FEATURE_xxx bit */
151 unsigned char pabyte; /* byte number in ibm,pa-features */
152 unsigned char pabit; /* bit number (big-endian) */
153 unsigned char invert; /* if 1, pa bit set => clear feature */
154 } ibm_pa_features[] __initdata = {
155 {0, 0, PPC_FEATURE_HAS_MMU, 0, 0, 0},
156 {0, 0, PPC_FEATURE_HAS_FPU, 0, 1, 0},
157 {0, MMU_FTR_SLB, 0, 0, 2, 0},
158 {CPU_FTR_CTRL, 0, 0, 0, 3, 0},
159 {CPU_FTR_NOEXECUTE, 0, 0, 0, 6, 0},
160 {CPU_FTR_NODSISRALIGN, 0, 0, 1, 1, 1},
161 {0, MMU_FTR_CI_LARGE_PAGE, 0, 1, 2, 0},
162 {CPU_FTR_REAL_LE, PPC_FEATURE_TRUE_LE, 5, 0, 0},
165 static void __init scan_features(unsigned long node, const unsigned char *ftrs,
166 unsigned long tablelen,
167 struct ibm_pa_feature *fp,
168 unsigned long ft_size)
170 unsigned long i, len, bit;
172 /* find descriptor with type == 0 */
178 return; /* descriptor 0 not found */
185 /* loop over bits we know about */
186 for (i = 0; i < ft_size; ++i, ++fp) {
187 if (fp->pabyte >= ftrs[0])
189 bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1;
190 if (bit ^ fp->invert) {
191 cur_cpu_spec->cpu_features |= fp->cpu_features;
192 cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs;
193 cur_cpu_spec->mmu_features |= fp->mmu_features;
195 cur_cpu_spec->cpu_features &= ~fp->cpu_features;
196 cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs;
197 cur_cpu_spec->mmu_features &= ~fp->mmu_features;
202 static void __init check_cpu_pa_features(unsigned long node)
204 const unsigned char *pa_ftrs;
207 pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen);
211 scan_features(node, pa_ftrs, tablelen,
212 ibm_pa_features, ARRAY_SIZE(ibm_pa_features));
215 #ifdef CONFIG_PPC_STD_MMU_64
216 static void __init check_cpu_slb_size(unsigned long node)
218 const __be32 *slb_size_ptr;
220 slb_size_ptr = of_get_flat_dt_prop(node, "slb-size", NULL);
221 if (slb_size_ptr != NULL) {
222 mmu_slb_size = be32_to_cpup(slb_size_ptr);
225 slb_size_ptr = of_get_flat_dt_prop(node, "ibm,slb-size", NULL);
226 if (slb_size_ptr != NULL) {
227 mmu_slb_size = be32_to_cpup(slb_size_ptr);
231 #define check_cpu_slb_size(node) do { } while(0)
234 static struct feature_property {
237 unsigned long cpu_feature;
238 unsigned long cpu_user_ftr;
239 } feature_properties[] __initdata = {
240 #ifdef CONFIG_ALTIVEC
241 {"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
242 {"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
243 #endif /* CONFIG_ALTIVEC */
245 /* Yes, this _really_ is ibm,vmx == 2 to enable VSX */
246 {"ibm,vmx", 2, CPU_FTR_VSX, PPC_FEATURE_HAS_VSX},
247 #endif /* CONFIG_VSX */
249 {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP},
250 {"ibm,purr", 1, CPU_FTR_PURR, 0},
251 {"ibm,spurr", 1, CPU_FTR_SPURR, 0},
252 #endif /* CONFIG_PPC64 */
255 #if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU)
256 static inline void identical_pvr_fixup(unsigned long node)
259 const char *model = of_get_flat_dt_prop(node, "model", NULL);
262 * Since 440GR(x)/440EP(x) processors have the same pvr,
263 * we check the node path and set bit 28 in the cur_cpu_spec
264 * pvr for EP(x) processor version. This bit is always 0 in
265 * the "real" pvr. Then we call identify_cpu again with
266 * the new logical pvr to enable FPU support.
268 if (model && strstr(model, "440EP")) {
269 pvr = cur_cpu_spec->pvr_value | 0x8;
270 identify_cpu(0, pvr);
271 DBG("Using logical pvr %x for %s\n", pvr, model);
275 #define identical_pvr_fixup(node) do { } while(0)
278 static void __init check_cpu_feature_properties(unsigned long node)
281 struct feature_property *fp = feature_properties;
284 for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) {
285 prop = of_get_flat_dt_prop(node, fp->name, NULL);
286 if (prop && be32_to_cpup(prop) >= fp->min_value) {
287 cur_cpu_spec->cpu_features |= fp->cpu_feature;
288 cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr;
293 static int __init early_init_dt_scan_cpus(unsigned long node,
294 const char *uname, int depth,
297 const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
299 const __be32 *intserv;
303 int found_thread = 0;
305 /* We are scanning "cpu" nodes only */
306 if (type == NULL || strcmp(type, "cpu") != 0)
309 /* Get physical cpuid */
310 intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len);
312 nthreads = len / sizeof(int);
314 intserv = of_get_flat_dt_prop(node, "reg", NULL);
319 * Now see if any of these threads match our boot cpu.
320 * NOTE: This must match the parsing done in smp_setup_cpu_maps.
322 for (i = 0; i < nthreads; i++) {
324 * version 2 of the kexec param format adds the phys cpuid of
327 if (be32_to_cpu(initial_boot_params->version) >= 2) {
328 if (be32_to_cpu(intserv[i]) ==
329 be32_to_cpu(initial_boot_params->boot_cpuid_phys)) {
330 found = boot_cpu_count;
335 * Check if it's the boot-cpu, set it's hw index now,
336 * unfortunately this format did not support booting
337 * off secondary threads.
339 if (of_get_flat_dt_prop(node,
340 "linux,boot-cpu", NULL) != NULL)
341 found = boot_cpu_count;
344 /* logical cpu id is always 0 on UP kernels */
350 DBG("boot cpu: logical %d physical %d\n", found,
351 be32_to_cpu(intserv[found_thread]));
353 set_hard_smp_processor_id(found,
354 be32_to_cpu(intserv[found_thread]));
357 * PAPR defines "logical" PVR values for cpus that
358 * meet various levels of the architecture:
359 * 0x0f000001 Architecture version 2.04
360 * 0x0f000002 Architecture version 2.05
361 * If the cpu-version property in the cpu node contains
362 * such a value, we call identify_cpu again with the
363 * logical PVR value in order to use the cpu feature
364 * bits appropriate for the architecture level.
366 * A POWER6 partition in "POWER6 architected" mode
367 * uses the 0x0f000002 PVR value; in POWER5+ mode
368 * it uses 0x0f000001.
370 prop = of_get_flat_dt_prop(node, "cpu-version", NULL);
371 if (prop && (be32_to_cpup(prop) & 0xff000000) == 0x0f000000)
372 identify_cpu(0, be32_to_cpup(prop));
374 identical_pvr_fixup(node);
377 check_cpu_feature_properties(node);
378 check_cpu_pa_features(node);
379 check_cpu_slb_size(node);
381 #ifdef CONFIG_PPC_PSERIES
383 cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
385 cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT;
391 int __init early_init_dt_scan_chosen_ppc(unsigned long node, const char *uname,
392 int depth, void *data)
394 const unsigned long *lprop; /* All these set by kernel, so no need to convert endian */
396 /* Use common scan routine to determine if this is the chosen node */
397 if (early_init_dt_scan_chosen(node, uname, depth, data) == 0)
401 /* check if iommu is forced on or off */
402 if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL)
404 if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL)
408 /* mem=x on the command line is the preferred mechanism */
409 lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL);
411 memory_limit = *lprop;
414 lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL);
416 tce_alloc_start = *lprop;
417 lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL);
419 tce_alloc_end = *lprop;
423 lprop = of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL);
425 crashk_res.start = *lprop;
427 lprop = of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL);
429 crashk_res.end = crashk_res.start + *lprop - 1;
436 #ifdef CONFIG_PPC_PSERIES
438 * Interpret the ibm,dynamic-memory property in the
439 * /ibm,dynamic-reconfiguration-memory node.
440 * This contains a list of memory blocks along with NUMA affinity
443 static int __init early_init_dt_scan_drconf_memory(unsigned long node)
445 const __be32 *dm, *ls, *usm;
447 unsigned long n, flags;
448 u64 base, size, memblock_size;
449 unsigned int is_kexec_kdump = 0, rngs;
451 ls = of_get_flat_dt_prop(node, "ibm,lmb-size", &l);
452 if (ls == NULL || l < dt_root_size_cells * sizeof(__be32))
454 memblock_size = dt_mem_next_cell(dt_root_size_cells, &ls);
456 dm = of_get_flat_dt_prop(node, "ibm,dynamic-memory", &l);
457 if (dm == NULL || l < sizeof(__be32))
460 n = of_read_number(dm++, 1); /* number of entries */
461 if (l < (n * (dt_root_addr_cells + 4) + 1) * sizeof(__be32))
464 /* check if this is a kexec/kdump kernel. */
465 usm = of_get_flat_dt_prop(node, "linux,drconf-usable-memory",
470 for (; n != 0; --n) {
471 base = dt_mem_next_cell(dt_root_addr_cells, &dm);
472 flags = of_read_number(&dm[3], 1);
473 /* skip DRC index, pad, assoc. list index, flags */
475 /* skip this block if the reserved bit is set in flags (0x80)
476 or if the block is not assigned to this partition (0x8) */
477 if ((flags & 0x80) || !(flags & 0x8))
479 size = memblock_size;
481 if (is_kexec_kdump) {
483 * For each memblock in ibm,dynamic-memory, a corresponding
484 * entry in linux,drconf-usable-memory property contains
485 * a counter 'p' followed by 'p' (base, size) duple.
486 * Now read the counter from
487 * linux,drconf-usable-memory property
489 rngs = dt_mem_next_cell(dt_root_size_cells, &usm);
490 if (!rngs) /* there are no (base, size) duple */
494 if (is_kexec_kdump) {
495 base = dt_mem_next_cell(dt_root_addr_cells,
497 size = dt_mem_next_cell(dt_root_size_cells,
501 if (base >= 0x80000000ul)
503 if ((base + size) > 0x80000000ul)
504 size = 0x80000000ul - base;
506 memblock_add(base, size);
513 #define early_init_dt_scan_drconf_memory(node) 0
514 #endif /* CONFIG_PPC_PSERIES */
516 static int __init early_init_dt_scan_memory_ppc(unsigned long node,
518 int depth, void *data)
521 strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0)
522 return early_init_dt_scan_drconf_memory(node);
524 return early_init_dt_scan_memory(node, uname, depth, data);
528 * For a relocatable kernel, we need to get the memstart_addr first,
529 * then use it to calculate the virtual kernel start address. This has
530 * to happen at a very early stage (before machine_init). In this case,
531 * we just want to get the memstart_address and would not like to mess the
532 * memblock at this stage. So introduce a variable to skip the memblock_add()
535 #ifdef CONFIG_RELOCATABLE
536 static int add_mem_to_memblock = 1;
538 #define add_mem_to_memblock 1
541 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
545 if (base >= 0x80000000ul)
547 if ((base + size) > 0x80000000ul)
548 size = 0x80000000ul - base;
551 /* Keep track of the beginning of memory -and- the size of
552 * the very first block in the device-tree as it represents
553 * the RMA on ppc64 server
555 if (base < memstart_addr) {
556 memstart_addr = base;
557 first_memblock_size = size;
560 /* Add the chunk to the MEMBLOCK list */
561 if (add_mem_to_memblock)
562 memblock_add(base, size);
565 static void __init early_reserve_mem_dt(void)
567 unsigned long i, dt_root;
571 dt_root = of_get_flat_dt_root();
573 prop = of_get_flat_dt_prop(dt_root, "reserved-ranges", &len);
578 DBG("Found new-style reserved-ranges\n");
580 /* Each reserved range is an (address,size) pair, 2 cells each,
581 * totalling 4 cells per range. */
582 for (i = 0; i < len / (sizeof(*prop) * 4); i++) {
585 base = of_read_number(prop + (i * 4) + 0, 2);
586 size = of_read_number(prop + (i * 4) + 2, 2);
589 DBG("reserving: %llx -> %llx\n", base, size);
590 memblock_reserve(base, size);
595 static void __init early_reserve_mem(void)
599 unsigned long self_base;
600 unsigned long self_size;
602 reserve_map = (__be64 *)(((unsigned long)initial_boot_params) +
603 be32_to_cpu(initial_boot_params->off_mem_rsvmap));
605 /* before we do anything, lets reserve the dt blob */
606 self_base = __pa((unsigned long)initial_boot_params);
607 self_size = be32_to_cpu(initial_boot_params->totalsize);
608 memblock_reserve(self_base, self_size);
610 /* Look for the new "reserved-regions" property in the DT */
611 early_reserve_mem_dt();
613 #ifdef CONFIG_BLK_DEV_INITRD
614 /* Then reserve the initrd, if any */
615 if (initrd_start && (initrd_end > initrd_start)) {
616 memblock_reserve(_ALIGN_DOWN(__pa(initrd_start), PAGE_SIZE),
617 _ALIGN_UP(initrd_end, PAGE_SIZE) -
618 _ALIGN_DOWN(initrd_start, PAGE_SIZE));
620 #endif /* CONFIG_BLK_DEV_INITRD */
624 * Handle the case where we might be booting from an old kexec
625 * image that setup the mem_rsvmap as pairs of 32-bit values
627 if (be64_to_cpup(reserve_map) > 0xffffffffull) {
628 u32 base_32, size_32;
629 __be32 *reserve_map_32 = (__be32 *)reserve_map;
631 DBG("Found old 32-bit reserve map\n");
634 base_32 = be32_to_cpup(reserve_map_32++);
635 size_32 = be32_to_cpup(reserve_map_32++);
638 /* skip if the reservation is for the blob */
639 if (base_32 == self_base && size_32 == self_size)
641 DBG("reserving: %x -> %x\n", base_32, size_32);
642 memblock_reserve(base_32, size_32);
647 DBG("Processing reserve map\n");
649 /* Handle the reserve map in the fdt blob if it exists */
651 base = be64_to_cpup(reserve_map++);
652 size = be64_to_cpup(reserve_map++);
655 DBG("reserving: %llx -> %llx\n", base, size);
656 memblock_reserve(base, size);
660 void __init early_init_devtree(void *params)
664 DBG(" -> early_init_devtree(%p)\n", params);
666 /* Setup flat device-tree pointer */
667 initial_boot_params = params;
669 #ifdef CONFIG_PPC_RTAS
670 /* Some machines might need RTAS info for debugging, grab it now. */
671 of_scan_flat_dt(early_init_dt_scan_rtas, NULL);
674 #ifdef CONFIG_PPC_POWERNV
675 /* Some machines might need OPAL info for debugging, grab it now. */
676 of_scan_flat_dt(early_init_dt_scan_opal, NULL);
679 #ifdef CONFIG_FA_DUMP
680 /* scan tree to see if dump is active during last boot */
681 of_scan_flat_dt(early_init_dt_scan_fw_dump, NULL);
684 /* Pre-initialize the cmd_line with the content of boot_commmand_line,
685 * which will be empty except when the content of the variable has
686 * been overriden by a bootloading mechanism. This happens typically
689 strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
691 /* Retrieve various informations from the /chosen node of the
692 * device-tree, including the platform type, initrd location and
693 * size, TCE reserve, and more ...
695 of_scan_flat_dt(early_init_dt_scan_chosen_ppc, cmd_line);
697 /* Scan memory nodes and rebuild MEMBLOCKs */
698 of_scan_flat_dt(early_init_dt_scan_root, NULL);
699 of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
701 /* Save command line for /proc/cmdline and then parse parameters */
702 strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
705 /* make sure we've parsed cmdline for mem= before this */
707 first_memblock_size = min_t(u64, first_memblock_size, memory_limit);
708 setup_initial_memory_limit(memstart_addr, first_memblock_size);
709 /* Reserve MEMBLOCK regions used by kernel, initrd, dt, etc... */
710 memblock_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START);
711 /* If relocatable, reserve first 32k for interrupt vectors etc. */
712 if (PHYSICAL_START > MEMORY_START)
713 memblock_reserve(MEMORY_START, 0x8000);
714 reserve_kdump_trampoline();
715 #ifdef CONFIG_FA_DUMP
717 * If we fail to reserve memory for firmware-assisted dump then
718 * fallback to kexec based kdump.
720 if (fadump_reserve_mem() == 0)
722 reserve_crashkernel();
726 * Ensure that total memory size is page-aligned, because otherwise
727 * mark_bootmem() gets upset.
729 limit = ALIGN(memory_limit ?: memblock_phys_mem_size(), PAGE_SIZE);
730 memblock_enforce_memory_limit(limit);
732 memblock_allow_resize();
735 DBG("Phys. mem: %llx\n", memblock_phys_mem_size());
737 /* We may need to relocate the flat tree, do it now.
738 * FIXME .. and the initrd too? */
743 DBG("Scanning CPUs ...\n");
745 /* Retrieve CPU related informations from the flat tree
746 * (altivec support, boot CPU ID, ...)
748 of_scan_flat_dt(early_init_dt_scan_cpus, NULL);
750 #if defined(CONFIG_SMP) && defined(CONFIG_PPC64)
751 /* We'll later wait for secondaries to check in; there are
752 * NCPUS-1 non-boot CPUs :-)
754 spinning_secondaries = boot_cpu_count - 1;
757 DBG(" <- early_init_devtree()\n");
760 #ifdef CONFIG_RELOCATABLE
762 * This function run before early_init_devtree, so we have to init
763 * initial_boot_params.
765 void __init early_get_first_memblock_info(void *params, phys_addr_t *size)
767 /* Setup flat device-tree pointer */
768 initial_boot_params = params;
771 * Scan the memory nodes and set add_mem_to_memblock to 0 to avoid
774 add_mem_to_memblock = 0;
775 of_scan_flat_dt(early_init_dt_scan_root, NULL);
776 of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
777 add_mem_to_memblock = 1;
780 *size = first_memblock_size;
786 * New implementation of the OF "find" APIs, return a refcounted
787 * object, call of_node_put() when done. The device tree and list
788 * are protected by a rw_lock.
790 * Note that property management will need some locking as well,
791 * this isn't dealt with yet.
796 * of_get_ibm_chip_id - Returns the IBM "chip-id" of a device
797 * @np: device node of the device
799 * This looks for a property "ibm,chip-id" in the node or any
800 * of its parents and returns its content, or -1 if it cannot
803 int of_get_ibm_chip_id(struct device_node *np)
807 struct device_node *old = np;
810 prop = of_get_property(np, "ibm,chip-id", NULL);
813 return be32_to_cpup(prop);
815 np = of_get_parent(np);
822 * cpu_to_chip_id - Return the cpus chip-id
823 * @cpu: The logical cpu number.
825 * Return the value of the ibm,chip-id property corresponding to the given
826 * logical cpu number. If the chip-id can not be found, returns -1.
828 int cpu_to_chip_id(int cpu)
830 struct device_node *np;
832 np = of_get_cpu_node(cpu, NULL);
837 return of_get_ibm_chip_id(np);
839 EXPORT_SYMBOL(cpu_to_chip_id);
841 #ifdef CONFIG_PPC_PSERIES
843 * Fix up the uninitialized fields in a new device node:
844 * name, type and pci-specific fields
847 static int of_finish_dynamic_node(struct device_node *node)
849 struct device_node *parent = of_get_parent(node);
851 const phandle *ibm_phandle;
853 node->name = of_get_property(node, "name", NULL);
854 node->type = of_get_property(node, "device_type", NULL);
857 node->name = "<NULL>";
859 node->type = "<NULL>";
866 /* We don't support that function on PowerMac, at least
869 if (machine_is(powermac))
872 /* fix up new node's phandle field */
873 if ((ibm_phandle = of_get_property(node, "ibm,phandle", NULL)))
874 node->phandle = *ibm_phandle;
881 static int prom_reconfig_notifier(struct notifier_block *nb,
882 unsigned long action, void *node)
887 case OF_RECONFIG_ATTACH_NODE:
888 err = of_finish_dynamic_node(node);
890 printk(KERN_ERR "finish_node returned %d\n", err);
896 return notifier_from_errno(err);
899 static struct notifier_block prom_reconfig_nb = {
900 .notifier_call = prom_reconfig_notifier,
901 .priority = 10, /* This one needs to run first */
904 static int __init prom_reconfig_setup(void)
906 return of_reconfig_notifier_register(&prom_reconfig_nb);
908 __initcall(prom_reconfig_setup);
911 bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
913 return (int)phys_id == get_hard_smp_processor_id(cpu);
916 #if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
917 static struct debugfs_blob_wrapper flat_dt_blob;
919 static int __init export_flat_device_tree(void)
923 flat_dt_blob.data = initial_boot_params;
924 flat_dt_blob.size = be32_to_cpu(initial_boot_params->totalsize);
926 d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
927 powerpc_debugfs_root, &flat_dt_blob);
933 __initcall(export_flat_device_tree);