This is a preparation patch.
Signed-off-by: Liu Yuan <namei.u...@gmail.com>
---
include/compiler.h | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 58 insertions(+)
diff --git a/include/compiler.h b/include/compiler.h
index f495819..8277367 100644
--- a/include/compiler.h
+++ b/include/compiler.h
@@ -16,6 +16,7 @@
#include <unistd.h>
#include <time.h>
#include <signal.h>
+#include <stdint.h>
#include "config.h"
@@ -24,6 +25,8 @@
#define __packed __attribute((packed))
+#define asmlinkage __attribute__((regparm(0)))
+
#define __printf(a, b) __attribute__((format(printf, a, b)))
/* Force a compilation error if the condition is true */
@@ -107,4 +110,59 @@ static inline int fallocate(int fd, int mode, __off_t
offset, __off_t len)
}
#endif
+#define X86_FEATURE_SSSE3 (4 * 32 + 9) /* Supplemental SSE-3 */
+#define X86_FEATURE_OSXSAVE (4 * 32 + 27) /* "" XSAVE enabled in the OS */
+#define X86_FEATURE_AVX (4 * 32 + 28) /* Advanced Vector Extensions */
+
+#define XSTATE_FP 0x1
+#define XSTATE_SSE 0x2
+#define XSTATE_YMM 0x4
+
+#define XCR_XFEATURE_ENABLED_MASK 0x00000000
+
+#ifdef __x86_64__
+
+static inline int cpu_has(int flag)
+{
+ uint32_t eax, ebx, ecx, edx;
+
+ eax = (flag & 0x100) ? 7 :
+ (flag & 0x20) ? 0x80000001 : 1;
+ ecx = 0;
+
+ asm volatile("cpuid"
+ : "+a" (eax), "=b" (ebx), "=d" (edx), "+c" (ecx));
+
+ return ((flag & 0x100 ? ebx :
+ (flag & 0x80) ? ecx : edx) >> (flag & 31)) & 1;
+}
+
+static inline uint64_t xgetbv(uint32_t idx)
+{
+ uint32_t eax, edx;
+
+ asm volatile(".byte 0x0f,0x01,0xd0" /* xgetbv */
+ : "=a" (eax), "=d" (edx)
+ : "c" (idx));
+ return eax + ((uint64_t)edx << 32);
+}
+
+#else
+
+static inline int cpu_has(int flag)
+{
+ return 0;
+}
+
+static inline uint64_t xgetbv(uint32_t idx)
+{
+ return 0;
+}
+
+#endif /* __x86_64__ */
+
+#define cpu_has_ssse3 cpu_has(X86_FEATURE_SSSE3)
+#define cpu_has_avx cpu_has(X86_FEATURE_AVX)
+#define cpu_has_osxsave cpu_has(X86_FEATURE_OSXSAVE)
+
#endif /* SD_COMPILER_H */
--
1.7.9.5
--
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