Merge with /shiny/git/linux-2.6/.git

1 files changed, 37 insertions, 0 deletions

diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index 76156ac..d56a439 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -256,6 +256,43 @@ acpi_processor_errata (
 
 
 /* --------------------------------------------------------------------------
+                              Common ACPI processor fucntions
+   -------------------------------------------------------------------------- */
+
+/*
+ * _PDC is required for a BIOS-OS handshake for most of the newer
+ * ACPI processor features.
+ */
+
+int acpi_processor_set_pdc(struct acpi_processor *pr,
+				struct acpi_object_list *pdc_in)
+{
+	acpi_status		status = AE_OK;
+	u32			arg0_buf[3];
+	union acpi_object	arg0 = {ACPI_TYPE_BUFFER};
+	struct acpi_object_list	no_object = {1, &arg0};
+	struct acpi_object_list	*pdc;
+
+	ACPI_FUNCTION_TRACE("acpi_processor_set_pdc");
+
+	arg0.buffer.length = 12;
+	arg0.buffer.pointer = (u8 *) arg0_buf;
+	arg0_buf[0] = ACPI_PDC_REVISION_ID;
+	arg0_buf[1] = 0;
+	arg0_buf[2] = 0;
+
+	pdc = (pdc_in) ? pdc_in : &no_object;
+
+	status = acpi_evaluate_object(pr->handle, "_PDC", pdc, NULL);
+
+	if ((ACPI_FAILURE(status)) && (pdc_in))
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Error evaluating _PDC, using legacy perf. control...\n"));
+
+	return_VALUE(status);
+}
+
+
+/* --------------------------------------------------------------------------
                               FS Interface (/proc)
    -------------------------------------------------------------------------- */