diff options
Diffstat (limited to 'src/Crypto/cpu.c')
| -rw-r--r-- | src/Crypto/cpu.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/src/Crypto/cpu.c b/src/Crypto/cpu.c new file mode 100644 index 00000000..6896240c --- /dev/null +++ b/src/Crypto/cpu.c @@ -0,0 +1,198 @@ +/* cpu.c - written and placed in the public domain by Wei Dai */
+
+#include "cpu.h"
+#include "misc.h"
+
+#ifndef CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY
+#include <signal.h>
+#include <setjmp.h>
+#endif
+
+#if CRYPTOPP_BOOL_SSE2_INTRINSICS_AVAILABLE
+#include <emmintrin.h>
+#endif
+
+#ifdef CRYPTOPP_CPUID_AVAILABLE
+
+#if _MSC_VER >= 1400 && CRYPTOPP_BOOL_X64
+
+int CpuId(uint32 input, uint32 *output)
+{
+ __cpuid((int *)output, input);
+ return 1;
+}
+
+#else
+
+#ifndef CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+typedef void (*SigHandler)(int);
+
+static jmp_buf s_jmpNoCPUID;
+static void SigIllHandlerCPUID(int p)
+{
+ longjmp(s_jmpNoCPUID, 1);
+}
+
+#if CRYPTOPP_BOOL_X64 == 0
+static jmp_buf s_jmpNoSSE2;
+static void SigIllHandlerSSE2(int p)
+{
+ longjmp(s_jmpNoSSE2, 1);
+}
+#endif
+#if defined(__cplusplus)
+}
+#endif
+#endif
+
+int CpuId(uint32 input, uint32 *output)
+{
+#ifdef CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY
+ __try
+ {
+ __asm
+ {
+ mov eax, input
+ cpuid
+ mov edi, output
+ mov [edi], eax
+ mov [edi+4], ebx
+ mov [edi+8], ecx
+ mov [edi+12], edx
+ }
+ }
+ __except (1)
+ {
+ return 0;
+ }
+ return 1;
+#else
+ SigHandler oldHandler = signal(SIGILL, SigIllHandlerCPUID);
+ if (oldHandler == SIG_ERR)
+ return 0;
+
+ int result = 1;
+ if (setjmp(s_jmpNoCPUID))
+ result = 0;
+ else
+ {
+ asm
+ (
+ // save ebx in case -fPIC is being used
+#if CRYPTOPP_BOOL_X86
+ "push %%ebx; cpuid; mov %%ebx, %%edi; pop %%ebx"
+#else
+ "pushq %%rbx; cpuid; mov %%ebx, %%edi; popq %%rbx"
+#endif
+ : "=a" (output[0]), "=D" (output[1]), "=c" (output[2]), "=d" (output[3])
+ : "a" (input)
+ );
+ }
+
+ signal(SIGILL, oldHandler);
+ return result;
+#endif
+}
+
+#endif
+
+static int TrySSE2()
+{
+#if CRYPTOPP_BOOL_X64
+ return 1;
+#elif defined(CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY)
+ __try
+ {
+#if CRYPTOPP_BOOL_SSE2_ASM_AVAILABLE
+ AS2(por xmm0, xmm0) // executing SSE2 instruction
+#elif CRYPTOPP_BOOL_SSE2_INTRINSICS_AVAILABLE
+ __m128i x = _mm_setzero_si128();
+ return _mm_cvtsi128_si32(x) == 0;
+#endif
+ }
+ __except (1)
+ {
+ return 0;
+ }
+ return 1;
+#else
+ SigHandler oldHandler = signal(SIGILL, SigIllHandlerSSE2);
+ if (oldHandler == SIG_ERR)
+ return 0;
+
+ int result = 1;
+ if (setjmp(s_jmpNoSSE2))
+ result = 0;
+ else
+ {
+#if CRYPTOPP_BOOL_SSE2_ASM_AVAILABLE
+ __asm __volatile ("por %xmm0, %xmm0");
+#elif CRYPTOPP_BOOL_SSE2_INTRINSICS_AVAILABLE
+ __m128i x = _mm_setzero_si128();
+ result = _mm_cvtsi128_si32(x) == 0;
+#endif
+ }
+
+ signal(SIGILL, oldHandler);
+ return result;
+#endif
+}
+
+int g_x86DetectionDone = 0;
+int g_hasISSE = 0, g_hasSSE2 = 0, g_hasSSSE3 = 0, g_hasMMX = 0, g_hasAESNI = 0, g_hasCLMUL = 0, g_isP4 = 0;
+uint32 g_cacheLineSize = CRYPTOPP_L1_CACHE_LINE_SIZE;
+
+void DetectX86Features()
+{
+ uint32 cpuid[4], cpuid1[4], tmp;
+ if (!CpuId(0, cpuid))
+ return;
+ if (!CpuId(1, cpuid1))
+ return;
+
+ g_hasMMX = (cpuid1[3] & (1 << 23)) != 0;
+ if ((cpuid1[3] & (1 << 26)) != 0)
+ g_hasSSE2 = TrySSE2();
+ g_hasSSSE3 = g_hasSSE2 && (cpuid1[2] & (1<<9));
+ g_hasAESNI = g_hasSSE2 && (cpuid1[2] & (1<<25));
+ g_hasCLMUL = g_hasSSE2 && (cpuid1[2] & (1<<1));
+
+ if ((cpuid1[3] & (1 << 25)) != 0)
+ g_hasISSE = 1;
+ else
+ {
+ uint32 cpuid2[4];
+ CpuId(0x080000000, cpuid2);
+ if (cpuid2[0] >= 0x080000001)
+ {
+ CpuId(0x080000001, cpuid2);
+ g_hasISSE = (cpuid2[3] & (1 << 22)) != 0;
+ }
+ }
+
+ tmp = cpuid[2];
+ cpuid[2] = cpuid[3];
+ cpuid[3] = tmp;
+ if (memcmp(cpuid+1, "GenuineIntel", 12) == 0)
+ {
+ g_isP4 = ((cpuid1[0] >> 8) & 0xf) == 0xf;
+ g_cacheLineSize = 8 * GETBYTE(cpuid1[1], 1);
+ }
+ else if (memcmp(cpuid+1, "AuthenticAMD", 12) == 0)
+ {
+ CpuId(0x80000005, cpuid);
+ g_cacheLineSize = GETBYTE(cpuid[2], 0);
+ }
+
+ if (!g_cacheLineSize)
+ g_cacheLineSize = CRYPTOPP_L1_CACHE_LINE_SIZE;
+
+ g_x86DetectionDone = 1;
+}
+
+#endif
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