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linux/arch/powerpc/kernel/prom.c
Andy Fleming e16c876553 powerpc/e6500: Add support for hardware threads 
The general idea is that each core will release all of its
threads into the secondary thread startup code, which will
eventually wait in the secondary core holding area, for the
appropriate bit in the PACA to be set. The kick_cpu function
pointer will set that bit in the PACA, and thus "release"
the core/thread to boot. We also need to do a few things that
U-Boot normally does for CPUs (like enable branch prediction).

Signed-off-by: Andy Fleming <afleming@freescale.com>
[scottwood@freescale.com: various changes, including only enabling
 threads if Linux wants to kick them]
Signed-off-by: Scott Wood <scottwood@freescale.com>
2014-07-29 19:26:20 -05:00

903 lines
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/*
* 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},
{0, MMU_FTR_SLB, 0, 0, 2, 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},
};
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;
}
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);
/* Setup flat device-tree pointer */
initial_boot_params = params;
#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
/* Pre-initialize the cmd_line with the content of boot_commmand_line,
* which will be empty except when the content of the variable has
* been overriden by a bootloading mechanism. This happens typically
* with HAL takeover
*/
strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
/* 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, cmd_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);
/* Save command line for /proc/cmdline and then parse parameters */
strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
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, because otherwise
* mark_bootmem() gets upset.
*/
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 indentify 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);
#ifdef CONFIG_PPC_PSERIES
/*
* Fix up the uninitialized fields in a new device node:
* name, type and pci-specific fields
*/
static int of_finish_dynamic_node(struct device_node *node)
{
struct device_node *parent = of_get_parent(node);
int err = 0;
const phandle *ibm_phandle;
node->name = of_get_property(node, "name", NULL);
node->type = of_get_property(node, "device_type", NULL);
if (!node->name)
node->name = "<NULL>";
if (!node->type)
node->type = "<NULL>";
if (!parent) {
err = -ENODEV;
goto out;
}
/* We don't support that function on PowerMac, at least
* not yet
*/
if (machine_is(powermac))
return -ENODEV;
/* fix up new node's phandle field */
if ((ibm_phandle = of_get_property(node, "ibm,phandle", NULL)))
node->phandle = *ibm_phandle;
out:
of_node_put(parent);
return err;
}
static int prom_reconfig_notifier(struct notifier_block *nb,
unsigned long action, void *node)
{
int err;
switch (action) {
case OF_RECONFIG_ATTACH_NODE:
err = of_finish_dynamic_node(node);
if (err < 0)
printk(KERN_ERR "finish_node returned %d\n", err);
break;
default:
err = 0;
break;
}
return notifier_from_errno(err);
}
static struct notifier_block prom_reconfig_nb = {
.notifier_call = prom_reconfig_notifier,
.priority = 10, /* This one needs to run first */
};
static int __init prom_reconfig_setup(void)
{
return of_reconfig_notifier_register(&prom_reconfig_nb);
}
__initcall(prom_reconfig_setup);
#endif
bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
{
return (int)phys_id == get_hard_smp_processor_id(cpu);
}
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