1. 根目录:
2. arch
3. arm
4. include
5. asm
6. hwcap.h

#ifndef __ASMARM_HWCAP_H
#define __ASMARM_HWCAP_H

#include <uapi/asm/hwcap.h>

#if !defined(__ASSEMBLY__)
/*
 * This yields a mask that user programs can use to figure out what
 * instruction set this cpu supports.
 */
#define ELF_HWCAP	(elf_hwcap)
extern unsigned int elf_hwcap;
#endif
#endif