1 files changed, 78 insertions, 0 deletions
diff --git a/qemu/roms/ipxe/src/arch/x86/include/ipxe/cpuid.h b/qemu/roms/ipxe/src/arch/x86/include/ipxe/cpuid.h
new file mode 100644
index 000000000..2f78dfca1
--- /dev/null
+++ b/qemu/roms/ipxe/src/arch/x86/include/ipxe/cpuid.h
@@ -0,0 +1,78 @@
+#ifndef _IPXE_CPUID_H
+#define _IPXE_CPUID_H
+
+/** @file
+ *
+ * x86 CPU feature detection
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <stdint.h>
+
+/** An x86 CPU feature register set */
+struct x86_feature_registers {
+	/** Features returned via %ecx */
+	uint32_t ecx;
+	/** Features returned via %edx */
+	uint32_t edx;
+};
+
+/** x86 CPU features */
+struct x86_features {
+	/** Intel-defined features (%eax=0x00000001) */
+	struct x86_feature_registers intel;
+	/** AMD-defined features (%eax=0x80000001) */
+	struct x86_feature_registers amd;
+};
+
+/** CPUID support flag */
+#define CPUID_FLAG 0x00200000UL
+
+/** CPUID extended function */
+#define CPUID_EXTENDED 0x80000000UL
+
+/** Get vendor ID and largest standard function */
+#define CPUID_VENDOR_ID 0x00000000UL
+
+/** Get standard features */
+#define CPUID_FEATURES 0x00000001UL
+
+/** Get largest extended function */
+#define CPUID_AMD_MAX_FN 0x80000000UL
+
+/** Extended function existence check */
+#define CPUID_AMD_CHECK 0x80000000UL
+
+/** Extended function existence check mask */
+#define CPUID_AMD_CHECK_MASK 0xffff0000UL
+
+/** Get extended features */
+#define CPUID_AMD_FEATURES 0x80000001UL
+
+/** Get CPU model */
+#define CPUID_MODEL 0x80000002UL
+
+/**
+ * Issue CPUID instruction
+ *
+ * @v operation		CPUID operation
+ * @v eax		Output via %eax
+ * @v ebx		Output via %ebx
+ * @v ecx		Output via %ecx
+ * @v edx		Output via %edx
+ */
+static inline __attribute__ (( always_inline )) void
+cpuid ( uint32_t operation, uint32_t *eax, uint32_t *ebx, uint32_t *ecx,
+	uint32_t *edx ) {
+
+	__asm__ ( "cpuid"
+		  : "=a" ( *eax ), "=b" ( *ebx ), "=c" ( *ecx ), "=d" ( *edx )
+		  : "0" ( operation ) );
+}
+
+extern int cpuid_is_supported ( void );
+extern void x86_features ( struct x86_features *features );
+
+#endif /* _IPXE_CPUID_H */