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Diffstat (limited to 'kernel/arch/powerpc/kernel/prom.c')
| -rw-r--r-- | kernel/arch/powerpc/kernel/prom.c | 827 |
1 files changed, 827 insertions, 0 deletions
diff --git a/kernel/arch/powerpc/kernel/prom.c b/kernel/arch/powerpc/kernel/prom.c new file mode 100644 index 000000000..308c5e156 --- /dev/null +++ b/kernel/arch/powerpc/kernel/prom.c @@ -0,0 +1,827 @@ +/* + * Procedures for creating, accessing and interpreting the device tree. + * + * Paul Mackerras August 1996. + * Copyright (C) 1996-2005 Paul Mackerras. + * + * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner. + * {engebret|bergner}@us.ibm.com + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#undef DEBUG + +#include <stdarg.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/init.h> +#include <linux/threads.h> +#include <linux/spinlock.h> +#include <linux/types.h> +#include <linux/pci.h> +#include <linux/stringify.h> +#include <linux/delay.h> +#include <linux/initrd.h> +#include <linux/bitops.h> +#include <linux/export.h> +#include <linux/kexec.h> +#include <linux/irq.h> +#include <linux/memblock.h> +#include <linux/of.h> +#include <linux/of_fdt.h> +#include <linux/libfdt.h> + +#include <asm/prom.h> +#include <asm/rtas.h> +#include <asm/page.h> +#include <asm/processor.h> +#include <asm/irq.h> +#include <asm/io.h> +#include <asm/kdump.h> +#include <asm/smp.h> +#include <asm/mmu.h> +#include <asm/paca.h> +#include <asm/pgtable.h> +#include <asm/pci.h> +#include <asm/iommu.h> +#include <asm/btext.h> +#include <asm/sections.h> +#include <asm/machdep.h> +#include <asm/pci-bridge.h> +#include <asm/kexec.h> +#include <asm/opal.h> +#include <asm/fadump.h> +#include <asm/debug.h> + +#include <mm/mmu_decl.h> + +#ifdef DEBUG +#define DBG(fmt...) printk(KERN_ERR fmt) +#else +#define DBG(fmt...) +#endif + +#ifdef CONFIG_PPC64 +int __initdata iommu_is_off; +int __initdata iommu_force_on; +unsigned long tce_alloc_start, tce_alloc_end; +u64 ppc64_rma_size; +#endif +static phys_addr_t first_memblock_size; +static int __initdata boot_cpu_count; + +static int __init early_parse_mem(char *p) +{ + if (!p) + return 1; + + memory_limit = PAGE_ALIGN(memparse(p, &p)); + DBG("memory limit = 0x%llx\n", memory_limit); + + return 0; +} +early_param("mem", early_parse_mem); + +/* + * overlaps_initrd - check for overlap with page aligned extension of + * initrd. + */ +static inline int overlaps_initrd(unsigned long start, unsigned long size) +{ +#ifdef CONFIG_BLK_DEV_INITRD + if (!initrd_start) + return 0; + + return (start + size) > _ALIGN_DOWN(initrd_start, PAGE_SIZE) && + start <= _ALIGN_UP(initrd_end, PAGE_SIZE); +#else + return 0; +#endif +} + +/** + * move_device_tree - move tree to an unused area, if needed. + * + * The device tree may be allocated beyond our memory limit, or inside the + * crash kernel region for kdump, or within the page aligned range of initrd. + * If so, move it out of the way. + */ +static void __init move_device_tree(void) +{ + unsigned long start, size; + void *p; + + DBG("-> move_device_tree\n"); + + start = __pa(initial_boot_params); + size = fdt_totalsize(initial_boot_params); + + if ((memory_limit && (start + size) > PHYSICAL_START + memory_limit) || + overlaps_crashkernel(start, size) || + overlaps_initrd(start, size)) { + p = __va(memblock_alloc(size, PAGE_SIZE)); + memcpy(p, initial_boot_params, size); + initial_boot_params = p; + DBG("Moved device tree to 0x%p\n", p); + } + + DBG("<- move_device_tree\n"); +} + +/* + * ibm,pa-features is a per-cpu property that contains a string of + * attribute descriptors, each of which has a 2 byte header plus up + * to 254 bytes worth of processor attribute bits. First header + * byte specifies the number of bytes following the header. + * Second header byte is an "attribute-specifier" type, of which + * zero is the only currently-defined value. + * Implementation: Pass in the byte and bit offset for the feature + * that we are interested in. The function will return -1 if the + * pa-features property is missing, or a 1/0 to indicate if the feature + * is supported/not supported. Note that the bit numbers are + * big-endian to match the definition in PAPR. + */ +static struct ibm_pa_feature { + unsigned long cpu_features; /* CPU_FTR_xxx bit */ + unsigned long mmu_features; /* MMU_FTR_xxx bit */ + unsigned int cpu_user_ftrs; /* PPC_FEATURE_xxx bit */ + unsigned char pabyte; /* byte number in ibm,pa-features */ + unsigned char pabit; /* bit number (big-endian) */ + unsigned char invert; /* if 1, pa bit set => clear feature */ +} ibm_pa_features[] __initdata = { + {0, 0, PPC_FEATURE_HAS_MMU, 0, 0, 0}, + {0, 0, PPC_FEATURE_HAS_FPU, 0, 1, 0}, + {CPU_FTR_CTRL, 0, 0, 0, 3, 0}, + {CPU_FTR_NOEXECUTE, 0, 0, 0, 6, 0}, + {CPU_FTR_NODSISRALIGN, 0, 0, 1, 1, 1}, + {0, MMU_FTR_CI_LARGE_PAGE, 0, 1, 2, 0}, + {CPU_FTR_REAL_LE, PPC_FEATURE_TRUE_LE, 5, 0, 0}, + /* + * If the kernel doesn't support TM (ie. CONFIG_PPC_TRANSACTIONAL_MEM=n), + * we don't want to turn on CPU_FTR_TM here, so we use CPU_FTR_TM_COMP + * which is 0 if the kernel doesn't support TM. + */ + {CPU_FTR_TM_COMP, 0, 0, 22, 0, 0}, +}; + +static void __init scan_features(unsigned long node, const unsigned char *ftrs, + unsigned long tablelen, + struct ibm_pa_feature *fp, + unsigned long ft_size) +{ + unsigned long i, len, bit; + + /* find descriptor with type == 0 */ + for (;;) { + if (tablelen < 3) + return; + len = 2 + ftrs[0]; + if (tablelen < len) + return; /* descriptor 0 not found */ + if (ftrs[1] == 0) + break; + tablelen -= len; + ftrs += len; + } + + /* loop over bits we know about */ + for (i = 0; i < ft_size; ++i, ++fp) { + if (fp->pabyte >= ftrs[0]) + continue; + bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1; + if (bit ^ fp->invert) { + cur_cpu_spec->cpu_features |= fp->cpu_features; + cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs; + cur_cpu_spec->mmu_features |= fp->mmu_features; + } else { + cur_cpu_spec->cpu_features &= ~fp->cpu_features; + cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs; + cur_cpu_spec->mmu_features &= ~fp->mmu_features; + } + } +} + +static void __init check_cpu_pa_features(unsigned long node) +{ + const unsigned char *pa_ftrs; + int tablelen; + + pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen); + if (pa_ftrs == NULL) + return; + + scan_features(node, pa_ftrs, tablelen, + ibm_pa_features, ARRAY_SIZE(ibm_pa_features)); +} + +#ifdef CONFIG_PPC_STD_MMU_64 +static void __init check_cpu_slb_size(unsigned long node) +{ + const __be32 *slb_size_ptr; + + slb_size_ptr = of_get_flat_dt_prop(node, "slb-size", NULL); + if (slb_size_ptr != NULL) { + mmu_slb_size = be32_to_cpup(slb_size_ptr); + return; + } + slb_size_ptr = of_get_flat_dt_prop(node, "ibm,slb-size", NULL); + if (slb_size_ptr != NULL) { + mmu_slb_size = be32_to_cpup(slb_size_ptr); + } +} +#else +#define check_cpu_slb_size(node) do { } while(0) +#endif + +static struct feature_property { + const char *name; + u32 min_value; + unsigned long cpu_feature; + unsigned long cpu_user_ftr; +} feature_properties[] __initdata = { +#ifdef CONFIG_ALTIVEC + {"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC}, + {"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC}, +#endif /* CONFIG_ALTIVEC */ +#ifdef CONFIG_VSX + /* Yes, this _really_ is ibm,vmx == 2 to enable VSX */ + {"ibm,vmx", 2, CPU_FTR_VSX, PPC_FEATURE_HAS_VSX}, +#endif /* CONFIG_VSX */ +#ifdef CONFIG_PPC64 + {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP}, + {"ibm,purr", 1, CPU_FTR_PURR, 0}, + {"ibm,spurr", 1, CPU_FTR_SPURR, 0}, +#endif /* CONFIG_PPC64 */ +}; + +#if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU) +static inline void identical_pvr_fixup(unsigned long node) +{ + unsigned int pvr; + const char *model = of_get_flat_dt_prop(node, "model", NULL); + + /* + * Since 440GR(x)/440EP(x) processors have the same pvr, + * we check the node path and set bit 28 in the cur_cpu_spec + * pvr for EP(x) processor version. This bit is always 0 in + * the "real" pvr. Then we call identify_cpu again with + * the new logical pvr to enable FPU support. + */ + if (model && strstr(model, "440EP")) { + pvr = cur_cpu_spec->pvr_value | 0x8; + identify_cpu(0, pvr); + DBG("Using logical pvr %x for %s\n", pvr, model); + } +} +#else +#define identical_pvr_fixup(node) do { } while(0) +#endif + +static void __init check_cpu_feature_properties(unsigned long node) +{ + unsigned long i; + struct feature_property *fp = feature_properties; + const __be32 *prop; + + for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) { + prop = of_get_flat_dt_prop(node, fp->name, NULL); + if (prop && be32_to_cpup(prop) >= fp->min_value) { + cur_cpu_spec->cpu_features |= fp->cpu_feature; + cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr; + } + } +} + +static int __init early_init_dt_scan_cpus(unsigned long node, + const char *uname, int depth, + void *data) +{ + const char *type = of_get_flat_dt_prop(node, "device_type", NULL); + const __be32 *prop; + const __be32 *intserv; + int i, nthreads; + int len; + int found = -1; + int found_thread = 0; + + /* We are scanning "cpu" nodes only */ + if (type == NULL || strcmp(type, "cpu") != 0) + return 0; + + /* Get physical cpuid */ + intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len); + if (!intserv) + intserv = of_get_flat_dt_prop(node, "reg", &len); + + nthreads = len / sizeof(int); + + /* + * Now see if any of these threads match our boot cpu. + * NOTE: This must match the parsing done in smp_setup_cpu_maps. + */ + for (i = 0; i < nthreads; i++) { + /* + * version 2 of the kexec param format adds the phys cpuid of + * booted proc. + */ + if (fdt_version(initial_boot_params) >= 2) { + if (be32_to_cpu(intserv[i]) == + fdt_boot_cpuid_phys(initial_boot_params)) { + found = boot_cpu_count; + found_thread = i; + } + } else { + /* + * Check if it's the boot-cpu, set it's hw index now, + * unfortunately this format did not support booting + * off secondary threads. + */ + if (of_get_flat_dt_prop(node, + "linux,boot-cpu", NULL) != NULL) + found = boot_cpu_count; + } +#ifdef CONFIG_SMP + /* logical cpu id is always 0 on UP kernels */ + boot_cpu_count++; +#endif + } + + /* Not the boot CPU */ + if (found < 0) + return 0; + + DBG("boot cpu: logical %d physical %d\n", found, + be32_to_cpu(intserv[found_thread])); + boot_cpuid = found; + set_hard_smp_processor_id(found, be32_to_cpu(intserv[found_thread])); + + /* + * PAPR defines "logical" PVR values for cpus that + * meet various levels of the architecture: + * 0x0f000001 Architecture version 2.04 + * 0x0f000002 Architecture version 2.05 + * If the cpu-version property in the cpu node contains + * such a value, we call identify_cpu again with the + * logical PVR value in order to use the cpu feature + * bits appropriate for the architecture level. + * + * A POWER6 partition in "POWER6 architected" mode + * uses the 0x0f000002 PVR value; in POWER5+ mode + * it uses 0x0f000001. + */ + prop = of_get_flat_dt_prop(node, "cpu-version", NULL); + if (prop && (be32_to_cpup(prop) & 0xff000000) == 0x0f000000) + identify_cpu(0, be32_to_cpup(prop)); + + identical_pvr_fixup(node); + + check_cpu_feature_properties(node); + check_cpu_pa_features(node); + check_cpu_slb_size(node); + +#ifdef CONFIG_PPC64 + if (nthreads > 1) + cur_cpu_spec->cpu_features |= CPU_FTR_SMT; + else + cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT; +#endif + return 0; +} + +static int __init early_init_dt_scan_chosen_ppc(unsigned long node, + const char *uname, + int depth, void *data) +{ + const unsigned long *lprop; /* All these set by kernel, so no need to convert endian */ + + /* Use common scan routine to determine if this is the chosen node */ + if (early_init_dt_scan_chosen(node, uname, depth, data) == 0) + return 0; + +#ifdef CONFIG_PPC64 + /* check if iommu is forced on or off */ + if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL) + iommu_is_off = 1; + if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL) + iommu_force_on = 1; +#endif + + /* mem=x on the command line is the preferred mechanism */ + lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL); + if (lprop) + memory_limit = *lprop; + +#ifdef CONFIG_PPC64 + lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL); + if (lprop) + tce_alloc_start = *lprop; + lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL); + if (lprop) + tce_alloc_end = *lprop; +#endif + +#ifdef CONFIG_KEXEC + lprop = of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL); + if (lprop) + crashk_res.start = *lprop; + + lprop = of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL); + if (lprop) + crashk_res.end = crashk_res.start + *lprop - 1; +#endif + + /* break now */ + return 1; +} + +#ifdef CONFIG_PPC_PSERIES +/* + * Interpret the ibm,dynamic-memory property in the + * /ibm,dynamic-reconfiguration-memory node. + * This contains a list of memory blocks along with NUMA affinity + * information. + */ +static int __init early_init_dt_scan_drconf_memory(unsigned long node) +{ + const __be32 *dm, *ls, *usm; + int l; + unsigned long n, flags; + u64 base, size, memblock_size; + unsigned int is_kexec_kdump = 0, rngs; + + ls = of_get_flat_dt_prop(node, "ibm,lmb-size", &l); + if (ls == NULL || l < dt_root_size_cells * sizeof(__be32)) + return 0; + memblock_size = dt_mem_next_cell(dt_root_size_cells, &ls); + + dm = of_get_flat_dt_prop(node, "ibm,dynamic-memory", &l); + if (dm == NULL || l < sizeof(__be32)) + return 0; + + n = of_read_number(dm++, 1); /* number of entries */ + if (l < (n * (dt_root_addr_cells + 4) + 1) * sizeof(__be32)) + return 0; + + /* check if this is a kexec/kdump kernel. */ + usm = of_get_flat_dt_prop(node, "linux,drconf-usable-memory", + &l); + if (usm != NULL) + is_kexec_kdump = 1; + + for (; n != 0; --n) { + base = dt_mem_next_cell(dt_root_addr_cells, &dm); + flags = of_read_number(&dm[3], 1); + /* skip DRC index, pad, assoc. list index, flags */ + dm += 4; + /* skip this block if the reserved bit is set in flags (0x80) + or if the block is not assigned to this partition (0x8) */ + if ((flags & 0x80) || !(flags & 0x8)) + continue; + size = memblock_size; + rngs = 1; + if (is_kexec_kdump) { + /* + * For each memblock in ibm,dynamic-memory, a corresponding + * entry in linux,drconf-usable-memory property contains + * a counter 'p' followed by 'p' (base, size) duple. + * Now read the counter from + * linux,drconf-usable-memory property + */ + rngs = dt_mem_next_cell(dt_root_size_cells, &usm); + if (!rngs) /* there are no (base, size) duple */ + continue; + } + do { + if (is_kexec_kdump) { + base = dt_mem_next_cell(dt_root_addr_cells, + &usm); + size = dt_mem_next_cell(dt_root_size_cells, + &usm); + } + if (iommu_is_off) { + if (base >= 0x80000000ul) + continue; + if ((base + size) > 0x80000000ul) + size = 0x80000000ul - base; + } + memblock_add(base, size); + } while (--rngs); + } + memblock_dump_all(); + return 0; +} +#else +#define early_init_dt_scan_drconf_memory(node) 0 +#endif /* CONFIG_PPC_PSERIES */ + +static int __init early_init_dt_scan_memory_ppc(unsigned long node, + const char *uname, + int depth, void *data) +{ + if (depth == 1 && + strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0) + return early_init_dt_scan_drconf_memory(node); + + return early_init_dt_scan_memory(node, uname, depth, data); +} + +/* + * For a relocatable kernel, we need to get the memstart_addr first, + * then use it to calculate the virtual kernel start address. This has + * to happen at a very early stage (before machine_init). In this case, + * we just want to get the memstart_address and would not like to mess the + * memblock at this stage. So introduce a variable to skip the memblock_add() + * for this reason. + */ +#ifdef CONFIG_RELOCATABLE +static int add_mem_to_memblock = 1; +#else +#define add_mem_to_memblock 1 +#endif + +void __init early_init_dt_add_memory_arch(u64 base, u64 size) +{ +#ifdef CONFIG_PPC64 + if (iommu_is_off) { + if (base >= 0x80000000ul) + return; + if ((base + size) > 0x80000000ul) + size = 0x80000000ul - base; + } +#endif + /* Keep track of the beginning of memory -and- the size of + * the very first block in the device-tree as it represents + * the RMA on ppc64 server + */ + if (base < memstart_addr) { + memstart_addr = base; + first_memblock_size = size; + } + + /* Add the chunk to the MEMBLOCK list */ + if (add_mem_to_memblock) + memblock_add(base, size); +} + +static void __init early_reserve_mem_dt(void) +{ + unsigned long i, dt_root; + int len; + const __be32 *prop; + + early_init_fdt_scan_reserved_mem(); + + dt_root = of_get_flat_dt_root(); + + prop = of_get_flat_dt_prop(dt_root, "reserved-ranges", &len); + + if (!prop) + return; + + DBG("Found new-style reserved-ranges\n"); + + /* Each reserved range is an (address,size) pair, 2 cells each, + * totalling 4 cells per range. */ + for (i = 0; i < len / (sizeof(*prop) * 4); i++) { + u64 base, size; + + base = of_read_number(prop + (i * 4) + 0, 2); + size = of_read_number(prop + (i * 4) + 2, 2); + + if (size) { + DBG("reserving: %llx -> %llx\n", base, size); + memblock_reserve(base, size); + } + } +} + +static void __init early_reserve_mem(void) +{ + __be64 *reserve_map; + + reserve_map = (__be64 *)(((unsigned long)initial_boot_params) + + fdt_off_mem_rsvmap(initial_boot_params)); + + /* Look for the new "reserved-regions" property in the DT */ + early_reserve_mem_dt(); + +#ifdef CONFIG_BLK_DEV_INITRD + /* Then reserve the initrd, if any */ + if (initrd_start && (initrd_end > initrd_start)) { + memblock_reserve(_ALIGN_DOWN(__pa(initrd_start), PAGE_SIZE), + _ALIGN_UP(initrd_end, PAGE_SIZE) - + _ALIGN_DOWN(initrd_start, PAGE_SIZE)); + } +#endif /* CONFIG_BLK_DEV_INITRD */ + +#ifdef CONFIG_PPC32 + /* + * Handle the case where we might be booting from an old kexec + * image that setup the mem_rsvmap as pairs of 32-bit values + */ + if (be64_to_cpup(reserve_map) > 0xffffffffull) { + u32 base_32, size_32; + __be32 *reserve_map_32 = (__be32 *)reserve_map; + + DBG("Found old 32-bit reserve map\n"); + + while (1) { + base_32 = be32_to_cpup(reserve_map_32++); + size_32 = be32_to_cpup(reserve_map_32++); + if (size_32 == 0) + break; + DBG("reserving: %x -> %x\n", base_32, size_32); + memblock_reserve(base_32, size_32); + } + return; + } +#endif +} + +void __init early_init_devtree(void *params) +{ + phys_addr_t limit; + + DBG(" -> early_init_devtree(%p)\n", params); + + /* Too early to BUG_ON(), do it by hand */ + if (!early_init_dt_verify(params)) + panic("BUG: Failed verifying flat device tree, bad version?"); + +#ifdef CONFIG_PPC_RTAS + /* Some machines might need RTAS info for debugging, grab it now. */ + of_scan_flat_dt(early_init_dt_scan_rtas, NULL); +#endif + +#ifdef CONFIG_PPC_POWERNV + /* Some machines might need OPAL info for debugging, grab it now. */ + of_scan_flat_dt(early_init_dt_scan_opal, NULL); +#endif + +#ifdef CONFIG_FA_DUMP + /* scan tree to see if dump is active during last boot */ + of_scan_flat_dt(early_init_dt_scan_fw_dump, NULL); +#endif + + /* Retrieve various informations from the /chosen node of the + * device-tree, including the platform type, initrd location and + * size, TCE reserve, and more ... + */ + of_scan_flat_dt(early_init_dt_scan_chosen_ppc, boot_command_line); + + /* Scan memory nodes and rebuild MEMBLOCKs */ + of_scan_flat_dt(early_init_dt_scan_root, NULL); + of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL); + + parse_early_param(); + + /* make sure we've parsed cmdline for mem= before this */ + if (memory_limit) + first_memblock_size = min_t(u64, first_memblock_size, memory_limit); + setup_initial_memory_limit(memstart_addr, first_memblock_size); + /* Reserve MEMBLOCK regions used by kernel, initrd, dt, etc... */ + memblock_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START); + /* If relocatable, reserve first 32k for interrupt vectors etc. */ + if (PHYSICAL_START > MEMORY_START) + memblock_reserve(MEMORY_START, 0x8000); + reserve_kdump_trampoline(); +#ifdef CONFIG_FA_DUMP + /* + * If we fail to reserve memory for firmware-assisted dump then + * fallback to kexec based kdump. + */ + if (fadump_reserve_mem() == 0) +#endif + reserve_crashkernel(); + early_reserve_mem(); + + /* Ensure that total memory size is page-aligned. */ + limit = ALIGN(memory_limit ?: memblock_phys_mem_size(), PAGE_SIZE); + memblock_enforce_memory_limit(limit); + + memblock_allow_resize(); + memblock_dump_all(); + + DBG("Phys. mem: %llx\n", memblock_phys_mem_size()); + + /* We may need to relocate the flat tree, do it now. + * FIXME .. and the initrd too? */ + move_device_tree(); + + allocate_pacas(); + + DBG("Scanning CPUs ...\n"); + + /* Retrieve CPU related informations from the flat tree + * (altivec support, boot CPU ID, ...) + */ + of_scan_flat_dt(early_init_dt_scan_cpus, NULL); + if (boot_cpuid < 0) { + printk("Failed to identify boot CPU !\n"); + BUG(); + } + +#if defined(CONFIG_SMP) && defined(CONFIG_PPC64) + /* We'll later wait for secondaries to check in; there are + * NCPUS-1 non-boot CPUs :-) + */ + spinning_secondaries = boot_cpu_count - 1; +#endif + +#ifdef CONFIG_PPC_POWERNV + /* Scan and build the list of machine check recoverable ranges */ + of_scan_flat_dt(early_init_dt_scan_recoverable_ranges, NULL); +#endif + + DBG(" <- early_init_devtree()\n"); +} + +#ifdef CONFIG_RELOCATABLE +/* + * This function run before early_init_devtree, so we have to init + * initial_boot_params. + */ +void __init early_get_first_memblock_info(void *params, phys_addr_t *size) +{ + /* Setup flat device-tree pointer */ + initial_boot_params = params; + + /* + * Scan the memory nodes and set add_mem_to_memblock to 0 to avoid + * mess the memblock. + */ + add_mem_to_memblock = 0; + of_scan_flat_dt(early_init_dt_scan_root, NULL); + of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL); + add_mem_to_memblock = 1; + + if (size) + *size = first_memblock_size; +} +#endif + +/******* + * + * New implementation of the OF "find" APIs, return a refcounted + * object, call of_node_put() when done. The device tree and list + * are protected by a rw_lock. + * + * Note that property management will need some locking as well, + * this isn't dealt with yet. + * + *******/ + +/** + * of_get_ibm_chip_id - Returns the IBM "chip-id" of a device + * @np: device node of the device + * + * This looks for a property "ibm,chip-id" in the node or any + * of its parents and returns its content, or -1 if it cannot + * be found. + */ +int of_get_ibm_chip_id(struct device_node *np) +{ + of_node_get(np); + while(np) { + struct device_node *old = np; + const __be32 *prop; + + prop = of_get_property(np, "ibm,chip-id", NULL); + if (prop) { + of_node_put(np); + return be32_to_cpup(prop); + } + np = of_get_parent(np); + of_node_put(old); + } + return -1; +} + +/** + * cpu_to_chip_id - Return the cpus chip-id + * @cpu: The logical cpu number. + * + * Return the value of the ibm,chip-id property corresponding to the given + * logical cpu number. If the chip-id can not be found, returns -1. + */ +int cpu_to_chip_id(int cpu) +{ + struct device_node *np; + + np = of_get_cpu_node(cpu, NULL); + if (!np) + return -1; + + of_node_put(np); + return of_get_ibm_chip_id(np); +} +EXPORT_SYMBOL(cpu_to_chip_id); + +bool arch_match_cpu_phys_id(int cpu, u64 phys_id) +{ + return (int)phys_id == get_hard_smp_processor_id(cpu); +} |