1 files changed, 73 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/gpxe/src/arch/i386/core/cpu.c b/contrib/syslinux-4.02/gpxe/src/arch/i386/core/cpu.c
new file mode 100644
index 0000000..c24fa4e
--- /dev/null
+++ b/contrib/syslinux-4.02/gpxe/src/arch/i386/core/cpu.c
@@ -0,0 +1,73 @@
+#include <stdint.h>
+#include <string.h>
+#include <cpu.h>
+
+/** @file
+ *
+ * CPU identification
+ *
+ */
+
+/**
+ * Test to see if CPU flag is changeable
+ *
+ * @v flag		Flag to test
+ * @ret can_change	Flag is changeable
+ */
+static inline int flag_is_changeable ( unsigned int flag ) {
+	uint32_t f1, f2;
+
+	__asm__ ( "pushfl\n\t"
+		  "pushfl\n\t"
+		  "popl %0\n\t"
+		  "movl %0,%1\n\t"
+		  "xorl %2,%0\n\t"
+		  "pushl %0\n\t"
+		  "popfl\n\t"
+		  "pushfl\n\t"
+		  "popl %0\n\t"
+		  "popfl\n\t"
+		  : "=&r" ( f1 ), "=&r" ( f2 )
+		  : "ir" ( flag ) );
+
+	return ( ( ( f1 ^ f2 ) & flag ) != 0 );
+}
+
+/**
+ * Get CPU information
+ *
+ * @v cpu		CPU information structure to fill in
+ */
+void get_cpuinfo ( struct cpuinfo_x86 *cpu ) {
+	unsigned int cpuid_level;
+	unsigned int cpuid_extlevel;
+	unsigned int discard_1, discard_2, discard_3;
+
+	memset ( cpu, 0, sizeof ( *cpu ) );
+
+	/* Check for CPUID instruction */
+	if ( ! flag_is_changeable ( X86_EFLAGS_ID ) ) {
+		DBG ( "CPUID not supported\n" );
+		return;
+	}
+
+	/* Get features, if present */
+	cpuid ( 0x00000000, &cpuid_level, &discard_1,
+		&discard_2, &discard_3 );
+	if ( cpuid_level >= 0x00000001 ) {
+		cpuid ( 0x00000001, &discard_1, &discard_2,
+			&discard_3, &cpu->features );
+	} else {
+		DBG ( "CPUID cannot return capabilities\n" );
+	}
+
+	/* Get 64-bit features, if present */
+	cpuid ( 0x80000000, &cpuid_extlevel, &discard_1,
+		&discard_2, &discard_3 );
+	if ( ( cpuid_extlevel & 0xffff0000 ) == 0x80000000 ) {
+		if ( cpuid_extlevel >= 0x80000001 ) {
+			cpuid ( 0x80000001, &discard_1, &discard_2,
+				&discard_3, &cpu->amd_features );
+		}
+	}
+}