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https://github.com/torvalds/linux
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4b4f7280d7
Some Dell laptops enter resume with apparent garbage in the segment descriptor registers (almost certainly the result of a botched transition from protected to real mode.) The only way to clean that up is to enter protected mode ourselves and clean out the descriptor registers. This fixes resume on Dell XPS M1210 and Dell D620. Reference: http://bugzilla.kernel.org/show_bug.cgi?id=10927 Signed-off-by: H. Peter Anvin <hpa@zytor.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Pavel Machek <pavel@ucw.cz> Cc: pm list <linux-pm@lists.linux-foundation.org> Cc: Len Brown <lenb@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Tested-by: Kirill A. Shutemov <kirill@shutemov.name> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
42 lines
1.1 KiB
C
42 lines
1.1 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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u16 _jmp1; /* ljmpl opcode, 32-bit only */
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u32 pmode_entry; /* Protected mode resume point, 32-bit only */
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u16 _jmp2; /* CS value, 32-bit only */
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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 realmode_flags;
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u32 real_magic;
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u16 trampoline_segment; /* segment with trampoline code, 64-bit only */
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u8 _pad1;
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u8 wakeup_jmp;
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u16 wakeup_jmp_off;
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u16 wakeup_jmp_seg;
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u64 wakeup_gdt[3];
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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 HEADER_OFFSET 0x3f00
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#define WAKEUP_SIZE 0x4000
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#endif /* ARCH_X86_KERNEL_ACPI_RM_WAKEUP_H */
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