linux/arch/x86/include/asm/proto.h

#ifndef _ASM_X86_PROTO_H
#define _ASM_X86_PROTO_H

#include <asm/ldt.h>

/* misc architecture specific prototypes */

extern void early_idt_handler(void);

extern void system_call(void);
extern void syscall_init(void);

extern void ia32_syscall(void);
extern void ia32_cstar_target(void);
extern void ia32_sysenter_target(void);

extern void syscall32_cpu_init(void);

extern void x86_configure_nx(void);
extern void x86_report_nx(void);

extern int reboot_force;

long do_arch_prctl(struct task_struct *task, int code, unsigned long addr);

/*
 * This looks more complex than it should be. But we need to
 * get the type for the ~ right in round_down (it needs to be
 * as wide as the result!), and we want to evaluate the macro
 * arguments just once each.
 */
#define __round_mask(x,y) ((__typeof__(x))((y)-1))
#define round_up(x,y) ((((x)-1) | __round_mask(x,y))+1)
#define round_down(x,y) ((x) & ~__round_mask(x,y))

#endif /* _ASM_X86_PROTO_H */