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Commit 54dbc0c9 authored by Aaron Durbin's avatar Aaron Durbin Committed by Andi Kleen
Browse files

[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: default avatarAaron Durbin <adurbin@google.com>
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
parent ec5c0926

arch/x86_64/kernel/apic.c

+54 −0
Original line number Diff line number Diff line
@@ -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++;

			}

		}

	}

}