73201dbec6
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
42 lines
1.2 KiB
C
42 lines
1.2 KiB
C
/*
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* Definitions for the wakeup data structure at the head of the
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* wakeup code.
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*/
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#ifndef ARCH_X86_KERNEL_ACPI_RM_WAKEUP_H
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#define ARCH_X86_KERNEL_ACPI_RM_WAKEUP_H
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#ifndef __ASSEMBLY__
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#include <linux/types.h>
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/* This must match data at wakeup.S */
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struct wakeup_header {
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u16 video_mode; /* Video mode number */
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u32 pmode_entry; /* Protected mode resume point, 32-bit only */
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u16 pmode_cs;
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u32 pmode_cr0; /* Protected mode cr0 */
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u32 pmode_cr3; /* Protected mode cr3 */
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u32 pmode_cr4; /* Protected mode cr4 */
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u32 pmode_efer_low; /* Protected mode EFER */
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u32 pmode_efer_high;
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u64 pmode_gdt;
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u32 pmode_misc_en_low; /* Protected mode MISC_ENABLE */
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u32 pmode_misc_en_high;
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u32 pmode_behavior; /* Wakeup routine behavior flags */
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u32 realmode_flags;
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u32 real_magic;
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u32 signature; /* To check we have correct structure */
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} __attribute__((__packed__));
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extern struct wakeup_header wakeup_header;
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#endif
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#define WAKEUP_HEADER_OFFSET 8
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#define WAKEUP_HEADER_SIGNATURE 0x51ee1111
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/* Wakeup behavior bits */
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#define WAKEUP_BEHAVIOR_RESTORE_MISC_ENABLE 0
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#define WAKEUP_BEHAVIOR_RESTORE_CR4 1
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#define WAKEUP_BEHAVIOR_RESTORE_EFER 2
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#endif /* ARCH_X86_KERNEL_ACPI_RM_WAKEUP_H */
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