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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,75 @@ | ||
/* | ||
* arch/i386/kernel/acpi/processor.c | ||
* | ||
* Copyright (C) 2005 Intel Corporation | ||
* Venkatesh Pallipadi <[email protected]> | ||
* - Added _PDC for platforms with Intel CPUs | ||
*/ | ||
|
||
#include <linux/kernel.h> | ||
#include <linux/module.h> | ||
#include <linux/init.h> | ||
#include <linux/acpi.h> | ||
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#include <acpi/processor.h> | ||
#include <asm/acpi.h> | ||
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static void init_intel_pdc(struct acpi_processor *pr, struct cpuinfo_x86 *c) | ||
{ | ||
struct acpi_object_list *obj_list; | ||
union acpi_object *obj; | ||
u32 *buf; | ||
|
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/* allocate and initialize pdc. It will be used later. */ | ||
obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL); | ||
if (!obj_list) { | ||
printk(KERN_ERR "Memory allocation error\n"); | ||
return; | ||
} | ||
|
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obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL); | ||
if (!obj) { | ||
printk(KERN_ERR "Memory allocation error\n"); | ||
kfree(obj_list); | ||
return; | ||
} | ||
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buf = kmalloc(12, GFP_KERNEL); | ||
if (!buf) { | ||
printk(KERN_ERR "Memory allocation error\n"); | ||
kfree(obj); | ||
kfree(obj_list); | ||
return; | ||
} | ||
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buf[0] = ACPI_PDC_REVISION_ID; | ||
buf[1] = 1; | ||
buf[2] = ACPI_PDC_C_CAPABILITY_SMP; | ||
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if (cpu_has(c, X86_FEATURE_EST)) | ||
buf[2] |= ACPI_PDC_EST_CAPABILITY_SMP; | ||
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obj->type = ACPI_TYPE_BUFFER; | ||
obj->buffer.length = 12; | ||
obj->buffer.pointer = (u8 *) buf; | ||
obj_list->count = 1; | ||
obj_list->pointer = obj; | ||
pr->pdc = obj_list; | ||
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return; | ||
} | ||
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/* Initialize _PDC data based on the CPU vendor */ | ||
void arch_acpi_processor_init_pdc(struct acpi_processor *pr) | ||
{ | ||
unsigned int cpu = pr->id; | ||
struct cpuinfo_x86 *c = cpu_data + cpu; | ||
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pr->pdc = NULL; | ||
if (c->x86_vendor == X86_VENDOR_INTEL) | ||
init_intel_pdc(pr, c); | ||
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return; | ||
} | ||
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EXPORT_SYMBOL(arch_acpi_processor_init_pdc); |
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