Dear Brown & Pallipadi：
Attached is a patch to support _PDC object evaluate for VIA CPUs.
The routine "arch_acpi_processor_init_pdc" which is at
"arch/x86/kernel/acpi/processor.c" currently only supports INTEL CPUs.
The patch has been tested on the "VIA VX800"chipset + "VIA C7-M1.8G" CPU.
It should work for other VIA chipset / BIOS that implements the _PDC object.
Thanks
Louis
--------------------------------------------------------------------------------
[PATCH] ACPI: Add _PDC object evaluate for VIA.
Frome: Louis Qi <louisqi@xxxxxxxxxxxxxx>
The current routine "arch_acpi_processor_init_pdc" only supports INTEL CPUs.
This patch add support for VIA CPUs.
Signed-off-by: Louis Qi <louisqi@xxxxxxxxxxxxxx>
---
--- 2.6.26.5/arch/x86/kernel/acpi/processor.c.orig 2008-09-27 15:46:14.000000000
+0800
+++ 2.6.26.5/arch/x86/kernel/acpi/processor.c 2008-09-27 15:46:14.000000000 +0800
@@ -66,6 +66,55 @@ static void init_intel_pdc(struct acpi_p
return;
}
+static void init_via_pdc(struct acpi_processor *pr, struct cpuinfo_x86 *c)
+{
+ struct acpi_object_list *obj_list;
+ union acpi_object *obj;
+ u32 *buf;
+
+ /* 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;
+ }
+
+ obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
+ if (!obj) {
+ printk(KERN_ERR "Memory allocation error\n");
+ kfree(obj_list);
+ return;
+ }
+
+ buf = kmalloc(12, GFP_KERNEL);
+ if (!buf) {
+ printk(KERN_ERR "Memory allocation error\n");
+ kfree(obj);
+ kfree(obj_list);
+ return;
+ }
+
+ buf[0] = ACPI_PDC_REVISION_ID;
+ buf[1] = 1;
+ buf[2] = 0;
+
+ if (cpu_has(c, X86_FEATURE_EST))
+ buf[2] |= ACPI_PDC_P_FFH;
+
+ if (cpu_has(c, X86_FEATURE_ACPI))
+ buf[2] |= ACPI_PDC_T_FFH;
+
+ 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;
+
+ return;
+}
+
+
/* Initialize _PDC data based on the CPU vendor */
void arch_acpi_processor_init_pdc(struct acpi_processor *pr)
{
@@ -74,6 +123,8 @@ void arch_acpi_processor_init_pdc(struct
pr->pdc = NULL;
if (c->x86_vendor == X86_VENDOR_INTEL)
init_intel_pdc(pr, c);
+ else if (c->x86_vendor == X86_VENDOR_CENTAUR)
+ init_via_pdc(pr, c);
return;
}
--
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