arch/x86/include/asm/trampoline.h

#ifndef _ASM_X86_TRAMPOLINE_H
#define _ASM_X86_TRAMPOLINE_H

#ifndef __ASSEMBLY__

#ifdef CONFIG_X86_TRAMPOLINE
/*
 * Trampoline 80x86 program as an array.
 */
extern const unsigned char trampoline_data [];
extern const unsigned char trampoline_end  [];
extern unsigned char *trampoline_base;

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

#define TRAMPOLINE_SIZE roundup(trampoline_end - trampoline_data, PAGE_SIZE)
#define TRAMPOLINE_BASE 0x6000

extern unsigned long setup_trampoline(void);
extern void __init reserve_trampoline_memory(void);
#else
static inline void reserve_trampoline_memory(void) {};
#endif /* CONFIG_X86_TRAMPOLINE */

#endif /* __ASSEMBLY__ */

#endif /* _ASM_X86_TRAMPOLINE_H */