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[PATCH] insert IOAPIC(s) and Local APIC into resource map 

This patch places the IOAPIC(s) and the Local APIC specified by ACPI
tables into the resource map. The APICs will then be visible within
/proc/iomem

Signed-off-by: Aaron Durbin <adurbin@google.com>
Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
adurbin@google.com 2006-09-26 10:52:39 +02:00 committed by Andi Kleen
parent ec5c09269b
commit 54dbc0c9eb
1 changed files with 54 additions and 0 deletions
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54
arch/x86_64/kernel/apic.c
View File

@ -25,6 +25,7 @@
#include <linux/kernel_stat.h>
#include <linux/sysdev.h>
#include <linux/module.h>
#include <linux/ioport.h>
#include <asm/atomic.h>
#include <asm/smp.h>
@ -45,6 +46,11 @@ int apic_calibrate_pmtmr __initdata;
int disable_apic_timer __initdata;
static struct resource lapic_resource = {
.name = "Local APIC",
.flags = IORESOURCE_MEM | IORESOURCE_BUSY,
};
/*
* cpu_mask that denotes the CPUs that needs timer interrupt coming in as
* IPIs in place of local APIC timers
@ -585,6 +591,40 @@ static int __init detect_init_APIC (void)
return 0;
}
#ifdef CONFIG_X86_IO_APIC
static struct resource * __init ioapic_setup_resources(void)
{
#define IOAPIC_RESOURCE_NAME_SIZE 11
unsigned long n;
struct resource *res;
char *mem;
int i;
if (nr_ioapics <= 0)
return NULL;
n = IOAPIC_RESOURCE_NAME_SIZE + sizeof(struct resource);
n *= nr_ioapics;
res = alloc_bootmem(n);
if (!res)
return NULL;
memset(res, 0, n);
mem = (void *)&res[nr_ioapics];
for (i = 0; i < nr_ioapics; i++) {
res[i].name = mem;
res[i].flags = IORESOURCE_MEM | IORESOURCE_BUSY;
snprintf(mem, IOAPIC_RESOURCE_NAME_SIZE, "IOAPIC %u", i);
mem += IOAPIC_RESOURCE_NAME_SIZE;
}
return res;
}
#endif
void __init init_apic_mappings(void)
{
unsigned long apic_phys;
@ -604,6 +644,11 @@ void __init init_apic_mappings(void)
apic_mapped = 1;
apic_printk(APIC_VERBOSE,"mapped APIC to %16lx (%16lx)\n", APIC_BASE, apic_phys);
/* Put local APIC into the resource map. */
lapic_resource.start = apic_phys;
lapic_resource.end = lapic_resource.start + PAGE_SIZE - 1;
insert_resource(&iomem_resource, &lapic_resource);
/*
* Fetch the APIC ID of the BSP in case we have a
* default configuration (or the MP table is broken).
@ -613,7 +658,9 @@ void __init init_apic_mappings(void)
{
unsigned long ioapic_phys, idx = FIX_IO_APIC_BASE_0;
int i;
struct resource *ioapic_res;
ioapic_res = ioapic_setup_resources();
for (i = 0; i < nr_ioapics; i++) {
if (smp_found_config) {
ioapic_phys = mp_ioapics[i].mpc_apicaddr;
@ -625,6 +672,13 @@ void __init init_apic_mappings(void)
apic_printk(APIC_VERBOSE,"mapped IOAPIC to %016lx (%016lx)\n",
__fix_to_virt(idx), ioapic_phys);
idx++;
if (ioapic_res) {
ioapic_res->start = ioapic_phys;
ioapic_res->end = ioapic_phys + (4 * 1024) - 1;
insert_resource(&iomem_resource, ioapic_res);
ioapic_res++;
}
}
}
}