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author | 2015-08-04 12:17:53 -0700 | |
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committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/arm64/include/asm/cpufeature.h | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/arm64/include/asm/cpufeature.h')
-rw-r--r-- | kernel/arch/arm64/include/asm/cpufeature.h | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/kernel/arch/arm64/include/asm/cpufeature.h b/kernel/arch/arm64/include/asm/cpufeature.h new file mode 100644 index 000000000..82cb9f98b --- /dev/null +++ b/kernel/arch/arm64/include/asm/cpufeature.h @@ -0,0 +1,76 @@ +/* + * Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef __ASM_CPUFEATURE_H +#define __ASM_CPUFEATURE_H + +#include <asm/hwcap.h> + +/* + * In the arm64 world (as in the ARM world), elf_hwcap is used both internally + * in the kernel and for user space to keep track of which optional features + * are supported by the current system. So let's map feature 'x' to HWCAP_x. + * Note that HWCAP_x constants are bit fields so we need to take the log. + */ + +#define MAX_CPU_FEATURES (8 * sizeof(elf_hwcap)) +#define cpu_feature(x) ilog2(HWCAP_ ## x) + +#define ARM64_WORKAROUND_CLEAN_CACHE 0 +#define ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE 1 +#define ARM64_WORKAROUND_845719 2 + +#define ARM64_NCAPS 3 + +#ifndef __ASSEMBLY__ + +struct arm64_cpu_capabilities { + const char *desc; + u16 capability; + bool (*matches)(const struct arm64_cpu_capabilities *); + union { + struct { /* To be used for erratum handling only */ + u32 midr_model; + u32 midr_range_min, midr_range_max; + }; + }; +}; + +extern DECLARE_BITMAP(cpu_hwcaps, ARM64_NCAPS); + +static inline bool cpu_have_feature(unsigned int num) +{ + return elf_hwcap & (1UL << num); +} + +static inline bool cpus_have_cap(unsigned int num) +{ + if (num >= ARM64_NCAPS) + return false; + return test_bit(num, cpu_hwcaps); +} + +static inline void cpus_set_cap(unsigned int num) +{ + if (num >= ARM64_NCAPS) + pr_warn("Attempt to set an illegal CPU capability (%d >= %d)\n", + num, ARM64_NCAPS); + else + __set_bit(num, cpu_hwcaps); +} + +void check_cpu_capabilities(const struct arm64_cpu_capabilities *caps, + const char *info); +void check_local_cpu_errata(void); +void check_local_cpu_features(void); +bool cpu_supports_mixed_endian_el0(void); +bool system_supports_mixed_endian_el0(void); + +#endif /* __ASSEMBLY__ */ + +#endif |