Move xen-pm options from dom0 cmdline option to start info.

Thus to avoid xen-pm being manually enforced by end user in dom0 cmdline but without enabling them in xen.

signed-off-by: Wei Gang <gang.wei@intel.com>

diff -r 1102cbef43fd arch/i386/kernel/acpi/processor_extcntl_xen.c
--- a/arch/i386/kernel/acpi/processor_extcntl_xen.c	Mon Jul 28 12:57:09 2008 +0800
+++ b/arch/i386/kernel/acpi/processor_extcntl_xen.c	Mon Jul 28 16:34:35 2008 +0800
@@ -33,13 +33,6 @@
 #include <asm/hypercall.h>
 
 static int xen_processor_pmbits;
-static int __init set_xen_processor_pmbits(char *str)
-{
-	get_option(&str, &xen_processor_pmbits);
-
-	return 1;
-}
-__setup("xen_processor_pmbits=", set_xen_processor_pmbits);
 
 static int xen_cx_notifier(struct acpi_processor *pr, int action)
 {
@@ -222,6 +215,8 @@ static struct processor_extcntl_ops xen_
 
 void arch_acpi_processor_init_extcntl(const struct processor_extcntl_ops **ops)
 {
+	xen_processor_pmbits = (xen_start_info->flags & SIF_PM_MASK) >> 8;
+
 	if (xen_processor_pmbits & XEN_PROCESSOR_PM_CX)
 		xen_extcntl_ops.pm_ops[PM_TYPE_IDLE] = xen_cx_notifier;
 	if (xen_processor_pmbits & XEN_PROCESSOR_PM_PX)
diff -r 1102cbef43fd include/xen/interface/xen.h
--- a/include/xen/interface/xen.h	Mon Jul 28 12:57:09 2008 +0800
+++ b/include/xen/interface/xen.h	Mon Jul 28 16:34:35 2008 +0800
@@ -554,6 +554,7 @@ typedef struct start_info start_info_t;
 /* These flags are passed in the 'flags' field of start_info_t. */
 #define SIF_PRIVILEGED    (1<<0)  /* Is the domain privileged? */
 #define SIF_INITDOMAIN    (1<<1)  /* Is this the initial control domain? */
+#define SIF_PM_MASK       (0xFF<<8) /* reserve 1 byte for xen-pm options */
 
 typedef struct dom0_vga_console_info {
     uint8_t video_type; /* DOM0_VGA_CONSOLE_??? */