X-Git-Url: https://git.ozlabs.org/?a=blobdiff_plain;f=ccan%2Fcpuid%2Fcpuid.c;h=df9b4aafc530268f96280e9bf52260c7477765dc;hb=715de3cf272d057e176d032986db45d2270494fc;hp=cab887b16f9236c83148c9aee9ca6b1f91636e1d;hpb=55b3c66cb086067c9e1f41ef149cfd34bac86028;p=ccan

diff --git a/ccan/cpuid/cpuid.c b/ccan/cpuid/cpuid.c
index cab887b1..df9b4aaf 100644
--- a/ccan/cpuid/cpuid.c
+++ b/ccan/cpuid/cpuid.c
@@ -90,31 +90,21 @@ static struct {
 	{ CEF_XOP, 		1 << 11, 	false }
 };
 
-static bool has_feature(int feature, uint32_t ecx, uint32_t edx)
-{
-	int i;
-
-	for (i = 0; i < sizeof(features) / sizeof(features[0]); ++i) {
-		if (features[i].feature == feature) {
-			if (features[i].use_edx)
-				return (edx & features[i].mask);
-			else
-				return (ecx & features[i].mask);
-		}
-	}
-
-	return false;
-}
-
 bool cpuid_is_supported(void)
 {
+	int ret = 0;
+#if defined(__GNUC__) || defined(__clang__)
 	/* The following assembly code uses EAX as the return value,
 	 * but we store the value of EAX into ret since GCC uses EAX
 	 * as the return register for every C function.  That's a double
 	 * operation, but there's no other way to do this unless doing this
-	 * function entirely in assembly.  */
-
-	/* This check is to make sure that the compiler is actually compiling
+	 * function entirely in assembly.
+	 *
+	 * The following assembly code has been shamelessly stolen from:
+	 * 	http://wiki.osdev.org/CPUID
+	 * and converted to work with AT&T syntax.
+	 *
+	 * This check is to make sure that the compiler is actually compiling
 	 * for 64-bit.
 	 *
 	 * The compiler can be 32-bit and the system 64-bit so the 
@@ -127,16 +117,15 @@ bool cpuid_is_supported(void)
 #define ASM_POPF	"popfq\n\t"
 #define ASM_PUSHEAX 	"pushq %%rax\n\t"
 #define ASM_POPEAX 	"popq %%rax\n\t"
-#define ASM_PUSHECX 	"popq %%rcx\n\t"
+#define ASM_PUSHECX 	"pushq %%rcx\n\t"
 #elif UINTPTR_MAX == 0xffffffff
 #define ASM_PUSHF 	"pushfl\n\t"
 #define ASM_POPF	"popfl\n\t"
 #define ASM_PUSHEAX 	"pushl %%eax\n\t"
 #define ASM_POPEAX 	"popl %%eax\n\t"
-#define ASM_PUSHECX 	"popl %%ecx\n\t"
+#define ASM_PUSHECX 	"pushl %%ecx\n\t"
 #endif
 
-	int ret = 0;
 	asm volatile(
 		ASM_PUSHF
 		ASM_POPEAX
@@ -159,7 +148,26 @@ bool cpuid_is_supported(void)
 #undef ASM_PUSHEAX
 #undef ASM_POPEAX
 #undef ASM_PUSHECX
-
+#elif defined _MSC_VER
+	__asm {
+		pushfd
+		pop eax
+		mov ecx, eax
+		xor eax, 0x200000
+		push eax
+		popfd
+
+		pushfd
+		pop eax
+		xor eax, ecx
+		shr eax, 21
+		and eax, 1
+		push ecx
+		popfd
+
+		mov eax, ret
+	};
+#endif
 	return !!ret;
 }
 
@@ -173,14 +181,22 @@ bool cpuid_test_feature(cpuid_t feature)
 
 bool cpuid_has_feature(int feature, bool extended)
 {
-	uint32_t eax, ebx, ecx, edx;
+	uint32_t eax, ebx, ecx, edx, i;
 
 	if (!extended)
 		___cpuid(CPU_PROCINFO_AND_FEATUREBITS, &eax, &ebx, &ecx, &edx);
 	else
 		___cpuid(CPU_EXTENDED_PROC_INFO_FEATURE_BITS, &eax, &ebx, &ecx, &edx);
 
-	return has_feature(feature, ecx, edx);
+	for (i = 0; i < sizeof(features) / sizeof(features[0]); ++i) {
+		if (features[i].feature == feature) {
+			if (features[i].use_edx)
+				return (edx & features[i].mask);
+			else
+				return (ecx & features[i].mask);
+		}
+	}
+	return false;
 }
 
 static const char *const cpuids[] = {
@@ -213,8 +229,6 @@ cputype_t cpuid_get_cpu_type(void)
 		uint32_t i;
 
 		___cpuid(CPU_VENDORID, &i, &u.bufu32[0], &u.bufu32[2], &u.bufu32[1]);
-		u.buf[12] = '\0';
-
 		for (i = 0; i < sizeof(cpuids) / sizeof(cpuids[0]); ++i) {
 			if (strncmp(cpuids[i], u.buf, 12) == 0) {
 				cputype = (cputype_t)i;
@@ -226,9 +240,14 @@ cputype_t cpuid_get_cpu_type(void)
 	return cputype;
 }
 
-const char *cpuid_get_cpu_type_string(const cputype_t cputype)
+bool cpuid_sprintf_cputype(const cputype_t cputype, char *buf)
 {
-	return cpuids[(int)cputype];
+	if (cputype == CT_NONE)
+		return false;
+
+	memcpy(buf, cpuids[(int)cputype], 12);
+	buf[12] = '\0';
+	return true;
 }
 
 uint32_t cpuid_highest_ext_func_supported(void)
@@ -236,11 +255,19 @@ uint32_t cpuid_highest_ext_func_supported(void)
 	static uint32_t highest;
 
 	if (!highest) {
+#if defined(__GNUC__) || defined(__clang__)
 		asm volatile(
 			"cpuid\n\t"
 			: "=a" (highest)
 			: "a" (CPU_HIGHEST_EXTENDED_FUNCTION_SUPPORTED)
 		);
+#elif defined _MSC_VER
+		__asm {
+			mov eax, CPU_HIGHEST_EXTENDED_FUNCTION_SUPPORTED
+			cpuid
+			mov highest, eax
+		};
+#endif
 	}
 
 	return highest;
@@ -256,9 +283,16 @@ void cpuid(cpuid_t info, uint32_t *buf)
 		return;
 
 	if (info == CPU_PROC_BRAND_STRING) {
-		___cpuid(CPU_PROC_BRAND_STRING,  	  &buf[0], &buf[1], &buf[2],  &buf[3]);
-		___cpuid(CPU_PROC_BRAND_STRING_INTERNAL0, &buf[4], &buf[5], &buf[6],  &buf[7]);
-		___cpuid(CPU_PROC_BRAND_STRING_INTERNAL1, &buf[8], &buf[9], &buf[10], &buf[11]);
+		static char cached[48] = { 0 };
+		if (cached[0] == '\0') {
+			___cpuid(CPU_PROC_BRAND_STRING,		  &buf[0], &buf[1], &buf[2],  &buf[3]);
+			___cpuid(CPU_PROC_BRAND_STRING_INTERNAL0, &buf[4], &buf[5], &buf[6],  &buf[7]);
+			___cpuid(CPU_PROC_BRAND_STRING_INTERNAL1, &buf[8], &buf[9], &buf[10], &buf[11]);
+
+			memcpy(cached, buf, sizeof cached);
+		} else
+			buf = (uint32_t *)cached;
+
 		return;
 	} else if (info == CPU_HIGHEST_EXTENDED_FUNCTION_SUPPORTED) {
 		*buf = cpuid_highest_ext_func_supported();
@@ -275,10 +309,20 @@ void cpuid(cpuid_t info, uint32_t *buf)
 			buf[2] = ecx;
 			break;
 		case CPU_PROCINFO_AND_FEATUREBITS:
-			buf[0] = eax; 	/* The so called "signature" of the CPU.  */
-			buf[1] = edx; 	/* Feature flags #1.  */
-			buf[2] = ecx; 	/* Feature flags #2.  */
-			buf[3] = ebx; 	/* Additional feature information.  */
+			buf[0] = (eax & 0x0F);		/* Stepping  */
+			buf[1] = (eax >> 4)  & 0x0F; 	/* Model  */
+			buf[2] = (eax >> 8)  & 0x0F; 	/* Family  */
+			buf[3] = (eax >> 16) & 0x0F; 	/* Extended Model.  */
+			buf[4] = (eax >> 24) & 0x0F; 	/* Extended Family.  */
+
+			buf[5] = edx; 			/* Feature flags #1.  */
+			buf[6] = ecx; 			/* Feature flags #2.  */
+
+			/* Additional Feature information.  */
+			buf[7] = ebx & 0xFF;
+			buf[8] = (ebx >> 8) & 0xFF;
+			buf[9] = (ebx >> 16) & 0xFF;
+			buf[10] = (ebx >> 24) & 0xFF;
 			break;
 		case CPU_CACHE_AND_TLBD_INFO:
 			buf[0] = eax;
@@ -297,13 +341,16 @@ void cpuid(cpuid_t info, uint32_t *buf)
 			buf[3] = edx;
 			break;
 		case CPU_EXTENDED_L2_CACHE_FEATURES:
-			*buf = ecx;
+			buf[0] = ecx & 0xFF; 		/* Line size.  */
+			buf[1] = (ecx >> 12) & 0xFF; 	/* Associativity.  */
+			buf[2] = ecx >> 16; 		/* Cache size.  */
 			break;
 		case CPU_ADV_POWER_MGT_INFO:
 			*buf = edx;
 			break;
 		case CPU_VIRT_PHYS_ADDR_SIZES:
-			*buf = eax;
+			buf[0] = eax & 0xFF; 		/* physical.  */
+			buf[1] = (eax >> 8) & 0xFF; 	/* virtual.  */
 			break;
 		default:
 			*buf = 0xbaadf00d;
@@ -312,4 +359,3 @@ void cpuid(cpuid_t info, uint32_t *buf)
 }
 
 #endif
-