xref: /linux/arch/x86/realmode/rm/wakeup.h (revision 498495dba268b20e8eadd7fe93c140c68b6cc9d2)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Definitions for the wakeup data structure at the head of the
4  * wakeup code.
5  */
6 
7 #ifndef ARCH_X86_KERNEL_ACPI_RM_WAKEUP_H
8 #define ARCH_X86_KERNEL_ACPI_RM_WAKEUP_H
9 
10 #ifndef __ASSEMBLY__
11 #include <linux/types.h>
12 
13 /* This must match data at wakeup.S */
14 struct wakeup_header {
15 	u16 video_mode;		/* Video mode number */
16 	u32 pmode_entry;	/* Protected mode resume point, 32-bit only */
17 	u16 pmode_cs;
18 	u32 pmode_cr0;		/* Protected mode cr0 */
19 	u32 pmode_cr3;		/* Protected mode cr3 */
20 	u32 pmode_cr4;		/* Protected mode cr4 */
21 	u32 pmode_efer_low;	/* Protected mode EFER */
22 	u32 pmode_efer_high;
23 	u64 pmode_gdt;
24 	u32 pmode_misc_en_low;	/* Protected mode MISC_ENABLE */
25 	u32 pmode_misc_en_high;
26 	u32 pmode_behavior;	/* Wakeup routine behavior flags */
27 	u32 realmode_flags;
28 	u32 real_magic;
29 	u32 signature;		/* To check we have correct structure */
30 } __attribute__((__packed__));
31 
32 extern struct wakeup_header wakeup_header;
33 #endif
34 
35 #define WAKEUP_HEADER_OFFSET	8
36 #define WAKEUP_HEADER_SIGNATURE 0x51ee1111
37 
38 /* Wakeup behavior bits */
39 #define WAKEUP_BEHAVIOR_RESTORE_MISC_ENABLE     0
40 #define WAKEUP_BEHAVIOR_RESTORE_CR4		1
41 #define WAKEUP_BEHAVIOR_RESTORE_EFER		2
42 
43 #endif /* ARCH_X86_KERNEL_ACPI_RM_WAKEUP_H */
44