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-rw-r--r--arch/arm64/include/asm/cpufeature.h20
-rw-r--r--arch/arm64/kernel/setup.c3
2 files changed, 23 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h
index cd4ac0516488..20b2b3d6b702 100644
--- a/arch/arm64/include/asm/cpufeature.h
+++ b/arch/arm64/include/asm/cpufeature.h
@@ -21,9 +21,29 @@
#define MAX_CPU_FEATURES (8 * sizeof(elf_hwcap))
#define cpu_feature(x) ilog2(HWCAP_ ## x)
+#define NCAPS 0
+
+extern DECLARE_BITMAP(cpu_hwcaps, 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 >= NCAPS)
+ return false;
+ return test_bit(num, cpu_hwcaps);
+}
+
+static inline void cpus_set_cap(unsigned int num)
+{
+ if (num >= NCAPS)
+ pr_warn("Attempt to set an illegal CPU capability (%d >= %d)\n",
+ num, NCAPS);
+ else
+ __set_bit(num, cpu_hwcaps);
+}
+
#endif
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 38eead12f35b..d502a86bed9f 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -50,6 +50,7 @@
#include <asm/cputype.h>
#include <asm/elf.h>
#include <asm/cputable.h>
+#include <asm/cpufeature.h>
#include <asm/cpu_ops.h>
#include <asm/sections.h>
#include <asm/setup.h>
@@ -79,6 +80,8 @@ unsigned int compat_elf_hwcap __read_mostly = COMPAT_ELF_HWCAP_DEFAULT;
unsigned int compat_elf_hwcap2 __read_mostly;
#endif
+DECLARE_BITMAP(cpu_hwcaps, NCAPS);
+
static const char *cpu_name;
phys_addr_t __fdt_pointer __initdata;