arch/x86/include/asm/realmode.h

#ifndef _ARCH_X86_REALMODE_H
#define _ARCH_X86_REALMODE_H

#include <linux/types.h>
#include <asm/io.h>

/* This must match data at realmode.S */
struct real_mode_header {
	u32	text_start;
	u32	ro_end;
	/* reboot */
#ifdef CONFIG_X86_32
	u32	machine_real_restart_asm;
#endif
	/* SMP trampoline */
	u32	trampoline_data;
	u32	trampoline_status;
#ifdef CONFIG_X86_32
	u32	startup_32_smp;
	u32	boot_gdt;
#else
	u32	startup_64_smp;
	u32	level3_ident_pgt;
	u32	level3_kernel_pgt;
#endif
#ifdef CONFIG_ACPI_SLEEP
	u32	wakeup_start;
	u32	wakeup_header;
#endif
} __attribute__((__packed__));

extern struct real_mode_header *real_mode_header;
extern unsigned char real_mode_blob_end[];

extern unsigned long init_rsp;
extern unsigned long initial_code;
extern unsigned long initial_gs;

extern unsigned char real_mode_blob[];
extern unsigned char real_mode_relocs[];

#ifdef CONFIG_X86_32
extern unsigned char startup_32_smp[];
extern unsigned char boot_gdt[];
#else
extern unsigned char secondary_startup_64[];
#endif

extern void __init setup_real_mode(void);

#endif /* _ARCH_X86_REALMODE_H */