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arm64: HWCAP: encapsulate elf_hwcap

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The introduction of AT_HWCAP2 introduced accessors which ensure that
hwcap features are set and tested appropriately.

Let's now mandate access to elf_hwcap via these accessors by making
elf_hwcap static within cpufeature.c.

Signed-off-by: Andrew Murray <andrew.murray@arm.com>
Reviewed-by: Dave Martin <Dave.Martin@arm.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Andrew Murray
2019-04-09 10:52:41 +01:00
committed by Will Deacon
parent aaba098fe6
commit aec0bff757
3 changed files with 38 additions and 17 deletions
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7
arch/arm64/include/asm/hwcap.h
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@@ -17,6 +17,7 @@
#define __ASM_HWCAP_H
#include <uapi/asm/hwcap.h>
#include <asm/cpufeature.h>
#define COMPAT_HWCAP_HALF (1 << 1)
#define COMPAT_HWCAP_THUMB (1 << 2)
@@ -40,7 +41,6 @@
#define COMPAT_HWCAP2_CRC32 (1 << 4)
#ifndef __ASSEMBLY__
#include <linux/kernel.h>
#include <linux/log2.h>
/*
@@ -93,8 +93,8 @@
* This yields a mask that user programs can use to figure out what
* instruction set this cpu supports.
*/
#define ELF_HWCAP lower_32_bits(elf_hwcap)
#define ELF_HWCAP2 upper_32_bits(elf_hwcap)
#define ELF_HWCAP cpu_get_elf_hwcap()
#define ELF_HWCAP2 cpu_get_elf_hwcap2()
#ifdef CONFIG_COMPAT
#define COMPAT_ELF_HWCAP (compat_elf_hwcap)
@@ -110,6 +110,5 @@ enum {
#endif
};
extern unsigned long elf_hwcap;
#endif
#endif