linux/arch/x86/realmode/rm/wakeup.h
H. Peter Anvin 73201dbec6 x86, suspend: On wakeup always initialize cr4 and EFER
We already have a flag word to indicate the existence of MISC_ENABLES,
so use the same flag word to indicate existence of cr4 and EFER, and
always restore them if they exist.  That way if something passes a
nonzero value when the value *should* be zero, we will still
initialize it.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Link: http://lkml.kernel.org/r/1348529239-17943-1-git-send-email-hpa@linux.intel.com
2012-09-26 15:06:22 -07:00

43 lines
1.2 KiB
C

/*
* Definitions for the wakeup data structure at the head of the
* wakeup code.
*/
#ifndef ARCH_X86_KERNEL_ACPI_RM_WAKEUP_H
#define ARCH_X86_KERNEL_ACPI_RM_WAKEUP_H
#ifndef __ASSEMBLY__
#include <linux/types.h>
/* This must match data at wakeup.S */
struct wakeup_header {
u16 video_mode; /* Video mode number */
u32 pmode_entry; /* Protected mode resume point, 32-bit only */
u16 pmode_cs;
u32 pmode_cr0; /* Protected mode cr0 */
u32 pmode_cr3; /* Protected mode cr3 */
u32 pmode_cr4; /* Protected mode cr4 */
u32 pmode_efer_low; /* Protected mode EFER */
u32 pmode_efer_high;
u64 pmode_gdt;
u32 pmode_misc_en_low; /* Protected mode MISC_ENABLE */
u32 pmode_misc_en_high;
u32 pmode_behavior; /* Wakeup routine behavior flags */
u32 realmode_flags;
u32 real_magic;
u32 signature; /* To check we have correct structure */
} __attribute__((__packed__));
extern struct wakeup_header wakeup_header;
#endif
#define WAKEUP_HEADER_OFFSET 8
#define WAKEUP_HEADER_SIGNATURE 0x51ee1111
/* Wakeup behavior bits */
#define WAKEUP_BEHAVIOR_RESTORE_MISC_ENABLE 0
#define WAKEUP_BEHAVIOR_RESTORE_CR4 1
#define WAKEUP_BEHAVIOR_RESTORE_EFER 2
#endif /* ARCH_X86_KERNEL_ACPI_RM_WAKEUP_H */