1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Procedures for creating, accessing and interpreting the device tree.
5 * Paul Mackerras August 1996.
6 * Copyright (C) 1996-2005 Paul Mackerras.
8 * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
9 * {engebret|bergner}@us.ibm.com
15 #include <linux/kernel.h>
16 #include <linux/string.h>
17 #include <linux/init.h>
18 #include <linux/threads.h>
19 #include <linux/spinlock.h>
20 #include <linux/types.h>
21 #include <linux/pci.h>
22 #include <linux/delay.h>
23 #include <linux/initrd.h>
24 #include <linux/bitops.h>
25 #include <linux/export.h>
26 #include <linux/kexec.h>
27 #include <linux/irq.h>
28 #include <linux/memblock.h>
30 #include <linux/of_fdt.h>
31 #include <linux/libfdt.h>
32 #include <linux/cpu.h>
33 #include <linux/pgtable.h>
38 #include <asm/processor.h>
41 #include <asm/kdump.h>
45 #include <asm/powernv.h>
46 #include <asm/iommu.h>
47 #include <asm/btext.h>
48 #include <asm/sections.h>
49 #include <asm/machdep.h>
50 #include <asm/pci-bridge.h>
51 #include <asm/kexec.h>
53 #include <asm/fadump.h>
54 #include <asm/epapr_hcalls.h>
55 #include <asm/firmware.h>
56 #include <asm/dt_cpu_ftrs.h>
57 #include <asm/drmem.h>
58 #include <asm/ultravisor.h>
60 #include <mm/mmu_decl.h>
63 #define DBG(fmt...) printk(KERN_ERR fmt)
69 int __initdata iommu_is_off;
70 int __initdata iommu_force_on;
71 unsigned long tce_alloc_start, tce_alloc_end;
74 static phys_addr_t first_memblock_size;
75 static int __initdata boot_cpu_count;
77 static int __init early_parse_mem(char *p)
82 memory_limit = PAGE_ALIGN(memparse(p, &p));
83 DBG("memory limit = 0x%llx\n", memory_limit);
87 early_param("mem", early_parse_mem);
90 * overlaps_initrd - check for overlap with page aligned extension of
93 static inline int overlaps_initrd(unsigned long start, unsigned long size)
95 #ifdef CONFIG_BLK_DEV_INITRD
99 return (start + size) > ALIGN_DOWN(initrd_start, PAGE_SIZE) &&
100 start <= ALIGN(initrd_end, PAGE_SIZE);
107 * move_device_tree - move tree to an unused area, if needed.
109 * The device tree may be allocated beyond our memory limit, or inside the
110 * crash kernel region for kdump, or within the page aligned range of initrd.
111 * If so, move it out of the way.
113 static void __init move_device_tree(void)
115 unsigned long start, size;
118 DBG("-> move_device_tree\n");
120 start = __pa(initial_boot_params);
121 size = fdt_totalsize(initial_boot_params);
123 if ((memory_limit && (start + size) > PHYSICAL_START + memory_limit) ||
124 !memblock_is_memory(start + size - 1) ||
125 overlaps_crashkernel(start, size) || overlaps_initrd(start, size)) {
126 p = memblock_alloc_raw(size, PAGE_SIZE);
128 panic("Failed to allocate %lu bytes to move device tree\n",
130 memcpy(p, initial_boot_params, size);
131 initial_boot_params = p;
132 DBG("Moved device tree to 0x%px\n", p);
135 DBG("<- move_device_tree\n");
139 * ibm,pa-features is a per-cpu property that contains a string of
140 * attribute descriptors, each of which has a 2 byte header plus up
141 * to 254 bytes worth of processor attribute bits. First header
142 * byte specifies the number of bytes following the header.
143 * Second header byte is an "attribute-specifier" type, of which
144 * zero is the only currently-defined value.
145 * Implementation: Pass in the byte and bit offset for the feature
146 * that we are interested in. The function will return -1 if the
147 * pa-features property is missing, or a 1/0 to indicate if the feature
148 * is supported/not supported. Note that the bit numbers are
149 * big-endian to match the definition in PAPR.
151 static struct ibm_pa_feature {
152 unsigned long cpu_features; /* CPU_FTR_xxx bit */
153 unsigned long mmu_features; /* MMU_FTR_xxx bit */
154 unsigned int cpu_user_ftrs; /* PPC_FEATURE_xxx bit */
155 unsigned int cpu_user_ftrs2; /* PPC_FEATURE2_xxx bit */
156 unsigned char pabyte; /* byte number in ibm,pa-features */
157 unsigned char pabit; /* bit number (big-endian) */
158 unsigned char invert; /* if 1, pa bit set => clear feature */
159 } ibm_pa_features[] __initdata = {
160 { .pabyte = 0, .pabit = 0, .cpu_user_ftrs = PPC_FEATURE_HAS_MMU },
161 { .pabyte = 0, .pabit = 1, .cpu_user_ftrs = PPC_FEATURE_HAS_FPU },
162 { .pabyte = 0, .pabit = 3, .cpu_features = CPU_FTR_CTRL },
163 { .pabyte = 0, .pabit = 6, .cpu_features = CPU_FTR_NOEXECUTE },
164 { .pabyte = 1, .pabit = 2, .mmu_features = MMU_FTR_CI_LARGE_PAGE },
165 #ifdef CONFIG_PPC_RADIX_MMU
166 { .pabyte = 40, .pabit = 0, .mmu_features = MMU_FTR_TYPE_RADIX },
168 { .pabyte = 1, .pabit = 1, .invert = 1, .cpu_features = CPU_FTR_NODSISRALIGN },
169 { .pabyte = 5, .pabit = 0, .cpu_features = CPU_FTR_REAL_LE,
170 .cpu_user_ftrs = PPC_FEATURE_TRUE_LE },
172 * If the kernel doesn't support TM (ie CONFIG_PPC_TRANSACTIONAL_MEM=n),
173 * we don't want to turn on TM here, so we use the *_COMP versions
174 * which are 0 if the kernel doesn't support TM.
176 { .pabyte = 22, .pabit = 0, .cpu_features = CPU_FTR_TM_COMP,
177 .cpu_user_ftrs2 = PPC_FEATURE2_HTM_COMP | PPC_FEATURE2_HTM_NOSC_COMP },
180 static void __init scan_features(unsigned long node, const unsigned char *ftrs,
181 unsigned long tablelen,
182 struct ibm_pa_feature *fp,
183 unsigned long ft_size)
185 unsigned long i, len, bit;
187 /* find descriptor with type == 0 */
193 return; /* descriptor 0 not found */
200 /* loop over bits we know about */
201 for (i = 0; i < ft_size; ++i, ++fp) {
202 if (fp->pabyte >= ftrs[0])
204 bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1;
205 if (bit ^ fp->invert) {
206 cur_cpu_spec->cpu_features |= fp->cpu_features;
207 cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs;
208 cur_cpu_spec->cpu_user_features2 |= fp->cpu_user_ftrs2;
209 cur_cpu_spec->mmu_features |= fp->mmu_features;
211 cur_cpu_spec->cpu_features &= ~fp->cpu_features;
212 cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs;
213 cur_cpu_spec->cpu_user_features2 &= ~fp->cpu_user_ftrs2;
214 cur_cpu_spec->mmu_features &= ~fp->mmu_features;
219 static void __init check_cpu_pa_features(unsigned long node)
221 const unsigned char *pa_ftrs;
224 pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen);
228 scan_features(node, pa_ftrs, tablelen,
229 ibm_pa_features, ARRAY_SIZE(ibm_pa_features));
232 #ifdef CONFIG_PPC_BOOK3S_64
233 static void __init init_mmu_slb_size(unsigned long node)
235 const __be32 *slb_size_ptr;
237 slb_size_ptr = of_get_flat_dt_prop(node, "slb-size", NULL) ? :
238 of_get_flat_dt_prop(node, "ibm,slb-size", NULL);
241 mmu_slb_size = be32_to_cpup(slb_size_ptr);
244 #define init_mmu_slb_size(node) do { } while(0)
247 static struct feature_property {
250 unsigned long cpu_feature;
251 unsigned long cpu_user_ftr;
252 } feature_properties[] __initdata = {
253 #ifdef CONFIG_ALTIVEC
254 {"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
255 {"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
256 #endif /* CONFIG_ALTIVEC */
258 /* Yes, this _really_ is ibm,vmx == 2 to enable VSX */
259 {"ibm,vmx", 2, CPU_FTR_VSX, PPC_FEATURE_HAS_VSX},
260 #endif /* CONFIG_VSX */
262 {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP},
263 {"ibm,purr", 1, CPU_FTR_PURR, 0},
264 {"ibm,spurr", 1, CPU_FTR_SPURR, 0},
265 #endif /* CONFIG_PPC64 */
268 #if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU)
269 static inline void identical_pvr_fixup(unsigned long node)
272 const char *model = of_get_flat_dt_prop(node, "model", NULL);
275 * Since 440GR(x)/440EP(x) processors have the same pvr,
276 * we check the node path and set bit 28 in the cur_cpu_spec
277 * pvr for EP(x) processor version. This bit is always 0 in
278 * the "real" pvr. Then we call identify_cpu again with
279 * the new logical pvr to enable FPU support.
281 if (model && strstr(model, "440EP")) {
282 pvr = cur_cpu_spec->pvr_value | 0x8;
283 identify_cpu(0, pvr);
284 DBG("Using logical pvr %x for %s\n", pvr, model);
288 #define identical_pvr_fixup(node) do { } while(0)
291 static void __init check_cpu_feature_properties(unsigned long node)
294 struct feature_property *fp = feature_properties;
297 for (i = 0; i < (int)ARRAY_SIZE(feature_properties); ++i, ++fp) {
298 prop = of_get_flat_dt_prop(node, fp->name, NULL);
299 if (prop && be32_to_cpup(prop) >= fp->min_value) {
300 cur_cpu_spec->cpu_features |= fp->cpu_feature;
301 cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr;
306 static int __init early_init_dt_scan_cpus(unsigned long node,
307 const char *uname, int depth,
310 const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
312 const __be32 *intserv;
316 int found_thread = 0;
318 /* We are scanning "cpu" nodes only */
319 if (type == NULL || strcmp(type, "cpu") != 0)
322 /* Get physical cpuid */
323 intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len);
325 intserv = of_get_flat_dt_prop(node, "reg", &len);
327 nthreads = len / sizeof(int);
330 * Now see if any of these threads match our boot cpu.
331 * NOTE: This must match the parsing done in smp_setup_cpu_maps.
333 for (i = 0; i < nthreads; i++) {
334 if (be32_to_cpu(intserv[i]) ==
335 fdt_boot_cpuid_phys(initial_boot_params)) {
336 found = boot_cpu_count;
340 /* logical cpu id is always 0 on UP kernels */
345 /* Not the boot CPU */
349 DBG("boot cpu: logical %d physical %d\n", found,
350 be32_to_cpu(intserv[found_thread]));
354 * PAPR defines "logical" PVR values for cpus that
355 * meet various levels of the architecture:
356 * 0x0f000001 Architecture version 2.04
357 * 0x0f000002 Architecture version 2.05
358 * If the cpu-version property in the cpu node contains
359 * such a value, we call identify_cpu again with the
360 * logical PVR value in order to use the cpu feature
361 * bits appropriate for the architecture level.
363 * A POWER6 partition in "POWER6 architected" mode
364 * uses the 0x0f000002 PVR value; in POWER5+ mode
365 * it uses 0x0f000001.
367 * If we're using device tree CPU feature discovery then we don't
368 * support the cpu-version property, and it's the responsibility of the
369 * firmware/hypervisor to provide the correct feature set for the
370 * architecture level via the ibm,powerpc-cpu-features binding.
372 if (!dt_cpu_ftrs_in_use()) {
373 prop = of_get_flat_dt_prop(node, "cpu-version", NULL);
374 if (prop && (be32_to_cpup(prop) & 0xff000000) == 0x0f000000)
375 identify_cpu(0, be32_to_cpup(prop));
377 check_cpu_feature_properties(node);
378 check_cpu_pa_features(node);
381 identical_pvr_fixup(node);
382 init_mmu_slb_size(node);
386 cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT;
387 else if (!dt_cpu_ftrs_in_use())
388 cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
389 allocate_paca(boot_cpuid);
391 set_hard_smp_processor_id(found, be32_to_cpu(intserv[found_thread]));
396 static int __init early_init_dt_scan_chosen_ppc(unsigned long node,
398 int depth, void *data)
400 const unsigned long *lprop; /* All these set by kernel, so no need to convert endian */
402 /* Use common scan routine to determine if this is the chosen node */
403 if (early_init_dt_scan_chosen(node, uname, depth, data) == 0)
407 /* check if iommu is forced on or off */
408 if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL)
410 if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL)
414 /* mem=x on the command line is the preferred mechanism */
415 lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL);
417 memory_limit = *lprop;
420 lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL);
422 tce_alloc_start = *lprop;
423 lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL);
425 tce_alloc_end = *lprop;
428 #ifdef CONFIG_KEXEC_CORE
429 lprop = of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL);
431 crashk_res.start = *lprop;
433 lprop = of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL);
435 crashk_res.end = crashk_res.start + *lprop - 1;
443 * Compare the range against max mem limit and update
444 * size if it cross the limit.
447 #ifdef CONFIG_SPARSEMEM
448 static bool validate_mem_limit(u64 base, u64 *size)
450 u64 max_mem = 1UL << (MAX_PHYSMEM_BITS);
454 if ((base + *size) > max_mem)
455 *size = max_mem - base;
459 static bool validate_mem_limit(u64 base, u64 *size)
465 #ifdef CONFIG_PPC_PSERIES
467 * Interpret the ibm dynamic reconfiguration memory LMBs.
468 * This contains a list of memory blocks along with NUMA affinity
471 static void __init early_init_drmem_lmb(struct drmem_lmb *lmb,
475 int is_kexec_kdump = 0, rngs;
477 base = lmb->base_addr;
478 size = drmem_lmb_size();
482 * Skip this block if the reserved bit is set in flags
483 * or if the block is not assigned to this partition.
485 if ((lmb->flags & DRCONF_MEM_RESERVED) ||
486 !(lmb->flags & DRCONF_MEM_ASSIGNED))
492 if (is_kexec_kdump) {
494 * For each memblock in ibm,dynamic-memory, a
495 * corresponding entry in linux,drconf-usable-memory
496 * property contains a counter 'p' followed by 'p'
497 * (base, size) duple. Now read the counter from
498 * linux,drconf-usable-memory property
500 rngs = dt_mem_next_cell(dt_root_size_cells, usm);
501 if (!rngs) /* there are no (base, size) duple */
506 if (is_kexec_kdump) {
507 base = dt_mem_next_cell(dt_root_addr_cells, usm);
508 size = dt_mem_next_cell(dt_root_size_cells, usm);
512 if (base >= 0x80000000ul)
514 if ((base + size) > 0x80000000ul)
515 size = 0x80000000ul - base;
518 if (!validate_mem_limit(base, &size))
521 DBG("Adding: %llx -> %llx\n", base, size);
522 memblock_add(base, size);
524 if (lmb->flags & DRCONF_MEM_HOTREMOVABLE)
525 memblock_mark_hotplug(base, size);
528 #endif /* CONFIG_PPC_PSERIES */
530 static int __init early_init_dt_scan_memory_ppc(unsigned long node,
532 int depth, void *data)
534 #ifdef CONFIG_PPC_PSERIES
536 strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0) {
537 walk_drmem_lmbs_early(node, early_init_drmem_lmb);
542 return early_init_dt_scan_memory(node, uname, depth, data);
546 * For a relocatable kernel, we need to get the memstart_addr first,
547 * then use it to calculate the virtual kernel start address. This has
548 * to happen at a very early stage (before machine_init). In this case,
549 * we just want to get the memstart_address and would not like to mess the
550 * memblock at this stage. So introduce a variable to skip the memblock_add()
553 #ifdef CONFIG_RELOCATABLE
554 static int add_mem_to_memblock = 1;
556 #define add_mem_to_memblock 1
559 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
563 if (base >= 0x80000000ul)
565 if ((base + size) > 0x80000000ul)
566 size = 0x80000000ul - base;
569 /* Keep track of the beginning of memory -and- the size of
570 * the very first block in the device-tree as it represents
571 * the RMA on ppc64 server
573 if (base < memstart_addr) {
574 memstart_addr = base;
575 first_memblock_size = size;
578 /* Add the chunk to the MEMBLOCK list */
579 if (add_mem_to_memblock) {
580 if (validate_mem_limit(base, &size))
581 memblock_add(base, size);
585 static void __init early_reserve_mem_dt(void)
587 unsigned long i, dt_root;
591 early_init_fdt_reserve_self();
592 early_init_fdt_scan_reserved_mem();
594 dt_root = of_get_flat_dt_root();
596 prop = of_get_flat_dt_prop(dt_root, "reserved-ranges", &len);
601 DBG("Found new-style reserved-ranges\n");
603 /* Each reserved range is an (address,size) pair, 2 cells each,
604 * totalling 4 cells per range. */
605 for (i = 0; i < len / (sizeof(*prop) * 4); i++) {
608 base = of_read_number(prop + (i * 4) + 0, 2);
609 size = of_read_number(prop + (i * 4) + 2, 2);
612 DBG("reserving: %llx -> %llx\n", base, size);
613 memblock_reserve(base, size);
618 static void __init early_reserve_mem(void)
622 reserve_map = (__be64 *)(((unsigned long)initial_boot_params) +
623 fdt_off_mem_rsvmap(initial_boot_params));
625 /* Look for the new "reserved-regions" property in the DT */
626 early_reserve_mem_dt();
628 #ifdef CONFIG_BLK_DEV_INITRD
629 /* Then reserve the initrd, if any */
630 if (initrd_start && (initrd_end > initrd_start)) {
631 memblock_reserve(ALIGN_DOWN(__pa(initrd_start), PAGE_SIZE),
632 ALIGN(initrd_end, PAGE_SIZE) -
633 ALIGN_DOWN(initrd_start, PAGE_SIZE));
635 #endif /* CONFIG_BLK_DEV_INITRD */
639 * Handle the case where we might be booting from an old kexec
640 * image that setup the mem_rsvmap as pairs of 32-bit values
642 if (be64_to_cpup(reserve_map) > 0xffffffffull) {
643 u32 base_32, size_32;
644 __be32 *reserve_map_32 = (__be32 *)reserve_map;
646 DBG("Found old 32-bit reserve map\n");
649 base_32 = be32_to_cpup(reserve_map_32++);
650 size_32 = be32_to_cpup(reserve_map_32++);
653 DBG("reserving: %x -> %x\n", base_32, size_32);
654 memblock_reserve(base_32, size_32);
661 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
662 static bool tm_disabled __initdata;
664 static int __init parse_ppc_tm(char *str)
668 if (kstrtobool(str, &res))
675 early_param("ppc_tm", parse_ppc_tm);
677 static void __init tm_init(void)
680 pr_info("Disabling hardware transactional memory (HTM)\n");
681 cur_cpu_spec->cpu_user_features2 &=
682 ~(PPC_FEATURE2_HTM_NOSC | PPC_FEATURE2_HTM);
683 cur_cpu_spec->cpu_features &= ~CPU_FTR_TM;
690 static void tm_init(void) { }
691 #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
694 static void __init save_fscr_to_task(void)
697 * Ensure the init_task (pid 0, aka swapper) uses the value of FSCR we
698 * have configured via the device tree features or via __init_FSCR().
699 * That value will then be propagated to pid 1 (init) and all future
702 if (early_cpu_has_feature(CPU_FTR_ARCH_207S))
703 init_task.thread.fscr = mfspr(SPRN_FSCR);
706 static inline void save_fscr_to_task(void) {};
710 void __init early_init_devtree(void *params)
714 DBG(" -> early_init_devtree(%px)\n", params);
716 /* Too early to BUG_ON(), do it by hand */
717 if (!early_init_dt_verify(params))
718 panic("BUG: Failed verifying flat device tree, bad version?");
720 #ifdef CONFIG_PPC_RTAS
721 /* Some machines might need RTAS info for debugging, grab it now. */
722 of_scan_flat_dt(early_init_dt_scan_rtas, NULL);
725 #ifdef CONFIG_PPC_POWERNV
726 /* Some machines might need OPAL info for debugging, grab it now. */
727 of_scan_flat_dt(early_init_dt_scan_opal, NULL);
729 /* Scan tree for ultravisor feature */
730 of_scan_flat_dt(early_init_dt_scan_ultravisor, NULL);
733 #if defined(CONFIG_FA_DUMP) || defined(CONFIG_PRESERVE_FA_DUMP)
734 /* scan tree to see if dump is active during last boot */
735 of_scan_flat_dt(early_init_dt_scan_fw_dump, NULL);
738 /* Retrieve various informations from the /chosen node of the
739 * device-tree, including the platform type, initrd location and
740 * size, TCE reserve, and more ...
742 of_scan_flat_dt(early_init_dt_scan_chosen_ppc, boot_command_line);
744 /* Scan memory nodes and rebuild MEMBLOCKs */
745 of_scan_flat_dt(early_init_dt_scan_root, NULL);
746 of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
750 /* make sure we've parsed cmdline for mem= before this */
752 first_memblock_size = min_t(u64, first_memblock_size, memory_limit);
753 setup_initial_memory_limit(memstart_addr, first_memblock_size);
754 /* Reserve MEMBLOCK regions used by kernel, initrd, dt, etc... */
755 memblock_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START);
756 /* If relocatable, reserve first 32k for interrupt vectors etc. */
757 if (PHYSICAL_START > MEMORY_START)
758 memblock_reserve(MEMORY_START, 0x8000);
759 reserve_kdump_trampoline();
760 #if defined(CONFIG_FA_DUMP) || defined(CONFIG_PRESERVE_FA_DUMP)
762 * If we fail to reserve memory for firmware-assisted dump then
763 * fallback to kexec based kdump.
765 if (fadump_reserve_mem() == 0)
767 reserve_crashkernel();
770 /* Ensure that total memory size is page-aligned. */
771 limit = ALIGN(memory_limit ?: memblock_phys_mem_size(), PAGE_SIZE);
772 memblock_enforce_memory_limit(limit);
774 memblock_allow_resize();
777 DBG("Phys. mem: %llx\n", (unsigned long long)memblock_phys_mem_size());
779 /* We may need to relocate the flat tree, do it now.
780 * FIXME .. and the initrd too? */
783 allocate_paca_ptrs();
785 DBG("Scanning CPUs ...\n");
789 /* Retrieve CPU related informations from the flat tree
790 * (altivec support, boot CPU ID, ...)
792 of_scan_flat_dt(early_init_dt_scan_cpus, NULL);
793 if (boot_cpuid < 0) {
794 printk("Failed to identify boot CPU !\n");
800 #if defined(CONFIG_SMP) && defined(CONFIG_PPC64)
801 /* We'll later wait for secondaries to check in; there are
802 * NCPUS-1 non-boot CPUs :-)
804 spinning_secondaries = boot_cpu_count - 1;
807 mmu_early_init_devtree();
809 #ifdef CONFIG_PPC_POWERNV
810 /* Scan and build the list of machine check recoverable ranges */
811 of_scan_flat_dt(early_init_dt_scan_recoverable_ranges, NULL);
813 epapr_paravirt_early_init();
815 /* Now try to figure out if we are running on LPAR and so on */
816 pseries_probe_fw_features();
818 #ifdef CONFIG_PPC_PS3
819 /* Identify PS3 firmware */
820 if (of_flat_dt_is_compatible(of_get_flat_dt_root(), "sony,ps3"))
821 powerpc_firmware_features |= FW_FEATURE_PS3_POSSIBLE;
826 DBG(" <- early_init_devtree()\n");
829 #ifdef CONFIG_RELOCATABLE
831 * This function run before early_init_devtree, so we have to init
832 * initial_boot_params.
834 void __init early_get_first_memblock_info(void *params, phys_addr_t *size)
836 /* Setup flat device-tree pointer */
837 initial_boot_params = params;
840 * Scan the memory nodes and set add_mem_to_memblock to 0 to avoid
843 add_mem_to_memblock = 0;
844 of_scan_flat_dt(early_init_dt_scan_root, NULL);
845 of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
846 add_mem_to_memblock = 1;
849 *size = first_memblock_size;
855 * New implementation of the OF "find" APIs, return a refcounted
856 * object, call of_node_put() when done. The device tree and list
857 * are protected by a rw_lock.
859 * Note that property management will need some locking as well,
860 * this isn't dealt with yet.
865 * of_get_ibm_chip_id - Returns the IBM "chip-id" of a device
866 * @np: device node of the device
868 * This looks for a property "ibm,chip-id" in the node or any
869 * of its parents and returns its content, or -1 if it cannot
872 int of_get_ibm_chip_id(struct device_node *np)
879 * Skiboot may produce memory nodes that contain more than one
880 * cell in chip-id, we only read the first one here.
882 if (!of_property_read_u32(np, "ibm,chip-id", &chip_id)) {
887 np = of_get_next_parent(np);
891 EXPORT_SYMBOL(of_get_ibm_chip_id);
894 * cpu_to_chip_id - Return the cpus chip-id
895 * @cpu: The logical cpu number.
897 * Return the value of the ibm,chip-id property corresponding to the given
898 * logical cpu number. If the chip-id can not be found, returns -1.
900 int cpu_to_chip_id(int cpu)
902 struct device_node *np;
904 np = of_get_cpu_node(cpu, NULL);
909 return of_get_ibm_chip_id(np);
911 EXPORT_SYMBOL(cpu_to_chip_id);
913 bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
917 * Early firmware scanning must use this rather than
918 * get_hard_smp_processor_id because we don't have pacas allocated
919 * until memory topology is discovered.
921 if (cpu_to_phys_id != NULL)
922 return (int)phys_id == cpu_to_phys_id[cpu];
925 return (int)phys_id == get_hard_smp_processor_id(cpu);