1/*
2 * arch/i386/kernel/acpi/processor.c
3 *
4 * Copyright (C) 2005 Intel Corporation
5 * 	Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
6 * 	- Added _PDC for platforms with Intel CPUs
7 */
8
9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/init.h>
12#include <linux/acpi.h>
13
14#include <acpi/processor.h>
15#include <asm/acpi.h>
16
17static void init_intel_pdc(struct acpi_processor *pr, struct cpuinfo_x86 *c)
18{
19	struct acpi_object_list *obj_list;
20	union acpi_object *obj;
21	u32 *buf;
22
23	/* allocate and initialize pdc. It will be used later. */
24	obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
25	if (!obj_list) {
26		printk(KERN_ERR "Memory allocation error\n");
27		return;
28	}
29
30	obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
31	if (!obj) {
32		printk(KERN_ERR "Memory allocation error\n");
33		kfree(obj_list);
34		return;
35	}
36
37	buf = kmalloc(12, GFP_KERNEL);
38	if (!buf) {
39		printk(KERN_ERR "Memory allocation error\n");
40		kfree(obj);
41		kfree(obj_list);
42		return;
43	}
44
45	buf[0] = ACPI_PDC_REVISION_ID;
46	buf[1] = 1;
47	buf[2] = ACPI_PDC_C_CAPABILITY_SMP;
48
49	if (cpu_has(c, X86_FEATURE_EST))
50		buf[2] |= ACPI_PDC_EST_CAPABILITY_SWSMP;
51
52	obj->type = ACPI_TYPE_BUFFER;
53	obj->buffer.length = 12;
54	obj->buffer.pointer = (u8 *) buf;
55	obj_list->count = 1;
56	obj_list->pointer = obj;
57	pr->pdc = obj_list;
58
59	return;
60}
61
62/* Initialize _PDC data based on the CPU vendor */
63void arch_acpi_processor_init_pdc(struct acpi_processor *pr)
64{
65	unsigned int cpu = pr->id;
66	struct cpuinfo_x86 *c = cpu_data + cpu;
67
68	pr->pdc = NULL;
69	if (c->x86_vendor == X86_VENDOR_INTEL)
70		init_intel_pdc(pr, c);
71
72	return;
73}
74
75EXPORT_SYMBOL(arch_acpi_processor_init_pdc);
76