[PATCH] ACPI: Add _PDC object evaluate for VIA.

[louisqi <louisqi@viatech.com.cn>]

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@viatech.com.cn>

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@viatech.com.cn>
---

--- 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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