lib; Add x86 cpuid based feature detection

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 169 insertions, 0 deletions

diff --git a/lib/igt_x86.c b/lib/igt_x86.c
new file mode 100644
index 00000000..f40b9a2f
--- /dev/null
+++ b/lib/igt_x86.c
@@ -0,0 +1,169 @@
+/*
+ * Copyright (c) 2013 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * Authors:
+ *    Chris Wilson <chris@chris-wilson.co.uk>
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#ifdef HAVE_CPUID_H
+#include <cpuid.h>
+#else
+#define __get_cpuid_max(x, y) 0
+#define __cpuid(level, a, b, c, d) a = b = c = d = 0
+#define __cpuid_count(level, count, a, b, c, d) a = b = c = d = 0
+#endif
+
+#include "igt_x86.h"
+#include <stdio.h>
+
+#define BASIC_CPUID 0x0
+#define EXTENDED_CPUID 0x80000000
+
+#ifndef bit_MMX
+#define bit_MMX		(1 << 23)
+#endif
+
+#ifndef bit_SSE
+#define bit_SSE		(1 << 25)
+#endif
+
+#ifndef bit_SSE2
+#define bit_SSE2	(1 << 26)
+#endif
+
+#ifndef bit_SSE3
+#define bit_SSE3	(1 << 0)
+#endif
+
+#ifndef bit_SSSE3
+#define bit_SSSE3	(1 << 9)
+#endif
+
+#ifndef bit_SSE4_1
+#define bit_SSE4_1	(1 << 19)
+#endif
+
+#ifndef bit_SSE4_2
+#define bit_SSE4_2	(1 << 20)
+#endif
+
+#ifndef bit_OSXSAVE
+#define bit_OSXSAVE	(1 << 27)
+#endif
+
+#ifndef bit_AVX
+#define bit_AVX		(1 << 28)
+#endif
+
+#ifndef bit_AVX2
+#define bit_AVX2	(1<<5)
+#endif
+
+#define xgetbv(index,eax,edx) \
+	__asm__ ("xgetbv" : "=a"(eax), "=d"(edx) : "c" (index))
+
+#define has_YMM 0x1
+
+unsigned igt_x86_features(void)
+{
+	unsigned max = __get_cpuid_max(BASIC_CPUID, 0);
+	unsigned eax, ebx, ecx, edx;
+	unsigned features = 0;
+	unsigned extra = 0;
+
+	if (max >= 1) {
+		__cpuid(1, eax, ebx, ecx, edx);
+
+		if (ecx & bit_SSE3)
+			features |= SSE3;
+
+		if (ecx & bit_SSSE3)
+			features |= SSSE3;
+
+		if (ecx & bit_SSE4_1)
+			features |= SSE4_1;
+
+		if (ecx & bit_SSE4_2)
+			features |= SSE4_2;
+
+		if (ecx & bit_OSXSAVE) {
+			unsigned int bv_eax, bv_ecx;
+			xgetbv(0, bv_eax, bv_ecx);
+			if ((bv_eax & 6) == 6)
+				extra |= has_YMM;
+		}
+
+		if ((extra & has_YMM) && (ecx & bit_AVX))
+			features |= AVX;
+
+		if (edx & bit_MMX)
+			features |= MMX;
+
+		if (edx & bit_SSE)
+			features |= SSE;
+
+		if (edx & bit_SSE2)
+			features |= SSE2;
+	}
+
+	if (max >= 7) {
+		__cpuid_count(7, 0, eax, ebx, ecx, edx);
+
+		if ((extra & has_YMM) && (ebx & bit_AVX2))
+			features |= AVX2;
+	}
+
+	return features;
+}
+
+char *igt_x86_features_to_string(unsigned features, char *line)
+{
+	char *ret = line;
+
+#ifdef __x86_64__
+	line += sprintf(line, "x86-64");
+#else
+	line += sprintf(line, "x86");
+#endif
+
+	if (features & SSE2)
+		line += sprintf(line, ", sse2");
+	if (features & SSE3)
+		line += sprintf(line, ", sse3");
+	if (features & SSSE3)
+		line += sprintf(line, ", ssse3");
+	if (features & SSE4_1)
+		line += sprintf(line, ", sse4.1");
+	if (features & SSE4_2)
+		line += sprintf(line, ", sse4.2");
+	if (features & AVX)
+		line += sprintf(line, ", avx");
+	if (features & AVX2)
+		line += sprintf(line, ", avx2");
+
+	return ret;
+}