3bdc2baa5bb190bb710286858f7ec14c1615a949
[sfrench/cifs-2.6.git] / arch / x86_64 / kernel / acpi / processor.c
1 /*
2  * arch/x86_64/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
17 static 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_EST_CAPABILITY_SMP;
48
49         obj->type = ACPI_TYPE_BUFFER;
50         obj->buffer.length = 12;
51         obj->buffer.pointer = (u8 *) buf;
52         obj_list->count = 1;
53         obj_list->pointer = obj;
54         pr->pdc = obj_list;
55
56         return;
57 }
58
59 /* Initialize _PDC data based on the CPU vendor */
60 void arch_acpi_processor_init_pdc(struct acpi_processor *pr)
61 {
62         unsigned int cpu = pr->id;
63         struct cpuinfo_x86 *c = cpu_data + cpu;
64
65         pr->pdc = NULL;
66         if (c->x86_vendor == X86_VENDOR_INTEL && cpu_has(c, X86_FEATURE_EST))
67                 init_intel_pdc(pr, c);
68
69         return;
70 }
71
72 EXPORT_SYMBOL(arch_acpi_processor_init_pdc);