diff options
| author |   Hendrik Brueckner <brueckner@linux.vnet.ibm.com> | 2015-02-19 12:22:02 +0100 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2015-07-22 09:58:02 +0200 |
| commit | 8f00b3e28f73e712a2f82a15f66acd852f60e3ba (patch) | |
| tree | 52fe46682c01970f8750a32dead49d7861b91e6c /arch/s390/include | |
| parent | cpufeature: correctly annotate the module init function (diff) | |
| download | linux-dev-8f00b3e28f73e712a2f82a15f66acd852f60e3ba.tar.xz linux-dev-8f00b3e28f73e712a2f82a15f66acd852f60e3ba.zip | |
s390/module: enable generic CPU feature modalias using s390 ELF hwcaps
Add support for the generic CPU feature modalias implementation that wires
up optional CPU features to udev-based module autoprobing.
The <asm/cpufeature.h> file provides definitions to map CPU features to
s390 ELF hardware capabilities.
Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include')
| -rw-r--r-- | arch/s390/include/asm/cpufeature.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/arch/s390/include/asm/cpufeature.h b/arch/s390/include/asm/cpufeature.h new file mode 100644 index 000000000000..fa7e69b7c299 --- /dev/null +++ b/arch/s390/include/asm/cpufeature.h @@ -0,0 +1,29 @@ +/* + * 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 */ |