31 lines
963 B
C
31 lines
963 B
C
|
/* SPDX-License-Identifier: GPL-2.0 */
|
||
|
|
/*
|
||
|
|
* Module interface for CPU features
|
||
|
|
*
|
||
|
|
* Copyright IBM Corp. 2015
|
||
|
|
* Author(s): Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef __ASM_S390_CPUFEATURE_H
|
||
|
|
#define __ASM_S390_CPUFEATURE_H
|
||
|
|
|
||
|
|
#include <asm/elf.h>
|
||
|
|
|
||
|
|
/* Hardware features on Linux on z Systems are indicated by facility bits that
|
||
|
|
* are mapped to the so-called machine flags. Particular machine flags are
|
||
|
|
* then used to define ELF hardware capabilities; most notably hardware flags
|
||
|
|
* that are essential for user space / glibc.
|
||
|
|
*
|
||
|
|
* Restrict the set of exposed CPU features to ELF hardware capabilities for
|
||
|
|
* now. Additional machine flags can be indicated by values larger than
|
||
|
|
* MAX_ELF_HWCAP_FEATURES.
|
||
|
|
*/
|
||
|
|
#define MAX_ELF_HWCAP_FEATURES (8 * sizeof(elf_hwcap))
|
||
|
|
#define MAX_CPU_FEATURES MAX_ELF_HWCAP_FEATURES
|
||
|
|
|
||
|
|
#define cpu_feature(feat) ilog2(HWCAP_S390_ ## feat)
|
||
|
|
|
||
|
|
int cpu_have_feature(unsigned int nr);
|
||
|
|
|
||
|
|
#endif /* __ASM_S390_CPUFEATURE_H */
|