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#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/percpu.h>
#include <asm/smp.h>
#include <asm/percpu.h>
#include <asm/sections.h>
#include <asm/processor.h>
#include <asm/setup.h>
#include <asm/topology.h>
#include <asm/mpspec.h>
#include <asm/apicdef.h>
unsigned int num_processors;
unsigned disabled_cpus __cpuinitdata;
/* Processor that is doing the boot up */
unsigned int boot_cpu_physical_apicid = -1U;
EXPORT_SYMBOL(boot_cpu_physical_apicid);
DEFINE_PER_CPU(u16, x86_cpu_to_apicid) = BAD_APICID;
EXPORT_PER_CPU_SYMBOL(x86_cpu_to_apicid);
/* Bitmask of physically existing CPUs */
physid_mask_t phys_cpu_present_map;
#if defined(CONFIG_HAVE_SETUP_PER_CPU_AREA) && defined(CONFIG_SMP)
/*
* Copy data used in early init routines from the initial arrays to the
* per cpu data areas. These arrays then become expendable and the
* *_early_ptr's are zeroed indicating that the static arrays are gone.
*/
static void __init setup_per_cpu_maps(void)
{
int cpu;
for_each_possible_cpu(cpu) {
per_cpu(x86_cpu_to_apicid, cpu) = x86_cpu_to_apicid_init[cpu];
per_cpu(x86_bios_cpu_apicid, cpu) =
x86_bios_cpu_apicid_init[cpu];
#ifdef CONFIG_NUMA
per_cpu(x86_cpu_to_node_map, cpu) =
x86_cpu_to_node_map_init[cpu];
#endif
}
/* indicate the early static arrays will soon be gone */
x86_cpu_to_apicid_early_ptr = NULL;
x86_bios_cpu_apicid_early_ptr = NULL;
#ifdef CONFIG_NUMA
x86_cpu_to_node_map_early_ptr = NULL;
#endif
}
#ifdef CONFIG_HAVE_CPUMASK_OF_CPU_MAP
cpumask_t *cpumask_of_cpu_map __read_mostly;
EXPORT_SYMBOL(cpumask_of_cpu_map);
/* requires nr_cpu_ids to be initialized */
static void __init setup_cpumask_of_cpu(void)
{
int i;
/* alloc_bootmem zeroes memory */
cpumask_of_cpu_map = alloc_bootmem_low(sizeof(cpumask_t) * nr_cpu_ids);
for (i = 0; i < nr_cpu_ids; i++)
cpu_set(i, cpumask_of_cpu_map[i]);
}
#else
static inline void setup_cpumask_of_cpu(void) { }
#endif
#ifdef CONFIG_X86_32
/*
* Great future not-so-futuristic plan: make i386 and x86_64 do it
* the same way
*/
unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
EXPORT_SYMBOL(__per_cpu_offset);
#endif
/*
* Great future plan:
* Declare PDA itself and support (irqstack,tss,pgd) as per cpu data.
* Always point %gs to its beginning
*/
void __init setup_per_cpu_areas(void)
{
int i, highest_cpu = 0;
unsigned long size;
#ifdef CONFIG_HOTPLUG_CPU
prefill_possible_map();
#endif
/* Copy section for each CPU (we discard the original) */
size = PERCPU_ENOUGH_ROOM;
printk(KERN_INFO "PERCPU: Allocating %zd bytes of per cpu data\n",
size);
for_each_possible_cpu(i) {
char *ptr;
#ifndef CONFIG_NEED_MULTIPLE_NODES
ptr = alloc_bootmem_pages(size);
#else
int node = early_cpu_to_node(i);
if (!node_online(node) || !NODE_DATA(node)) {
ptr = alloc_bootmem_pages(size);
printk(KERN_INFO
"cpu %d has no node or node-local memory\n", i);
}
else
ptr = alloc_bootmem_pages_node(NODE_DATA(node), size);
#endif
if (!ptr)
panic("Cannot allocate cpu data for CPU %d\n", i);
#ifdef CONFIG_X86_64
cpu_pda(i)->data_offset = ptr - __per_cpu_start;
#else
__per_cpu_offset[i] = ptr - __per_cpu_start;
#endif
memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
highest_cpu = i;
}
nr_cpu_ids = highest_cpu + 1;
printk(KERN_DEBUG "NR_CPUS: %d, nr_cpu_ids: %d\n", NR_CPUS, nr_cpu_ids);
/* Setup percpu data maps */
setup_per_cpu_maps();
/* Setup cpumask_of_cpu map */
setup_cpumask_of_cpu();
}
#endif
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