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TOMOYO Linux Cross Reference
Linux/arch/s390/include/asm/cpufeature.h

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  1 /*
  2  * Module interface for CPU features
  3  *
  4  * Copyright IBM Corp. 2015
  5  * Author(s): Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
  6  */
  7 
  8 #ifndef __ASM_S390_CPUFEATURE_H
  9 #define __ASM_S390_CPUFEATURE_H
 10 
 11 #include <asm/elf.h>
 12 
 13 /* Hardware features on Linux on z Systems are indicated by facility bits that
 14  * are mapped to the so-called machine flags.  Particular machine flags are
 15  * then used to define ELF hardware capabilities; most notably hardware flags
 16  * that are essential for user space / glibc.
 17  *
 18  * Restrict the set of exposed CPU features to ELF hardware capabilities for
 19  * now.  Additional machine flags can be indicated by values larger than
 20  * MAX_ELF_HWCAP_FEATURES.
 21  */
 22 #define MAX_ELF_HWCAP_FEATURES  (8 * sizeof(elf_hwcap))
 23 #define MAX_CPU_FEATURES        MAX_ELF_HWCAP_FEATURES
 24 
 25 #define cpu_feature(feat)       ilog2(HWCAP_S390_ ## feat)
 26 
 27 int cpu_have_feature(unsigned int nr);
 28 
 29 #endif /* __ASM_S390_CPUFEATURE_H */
 30 

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