1 files changed, 60 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/nexgen.c b/arch/x86/kernel/cpu/nexgen.c
new file mode 100644
index 00000000000..961fbe1a748
--- /dev/null
+++ b/arch/x86/kernel/cpu/nexgen.c
@@ -0,0 +1,60 @@
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <asm/processor.h>
+
+#include "cpu.h"
+
+/*
+ *	Detect a NexGen CPU running without BIOS hypercode new enough
+ *	to have CPUID. (Thanks to Herbert Oppmann)
+ */
+ 
+static int __cpuinit deep_magic_nexgen_probe(void)
+{
+	int ret;
+	
+	__asm__ __volatile__ (
+		"	movw	$0x5555, %%ax\n"
+		"	xorw	%%dx,%%dx\n"
+		"	movw	$2, %%cx\n"
+		"	divw	%%cx\n"
+		"	movl	$0, %%eax\n"
+		"	jnz	1f\n"
+		"	movl	$1, %%eax\n"
+		"1:\n" 
+		: "=a" (ret) : : "cx", "dx" );
+	return  ret;
+}
+
+static void __cpuinit init_nexgen(struct cpuinfo_x86 * c)
+{
+	c->x86_cache_size = 256; /* A few had 1 MB... */
+}
+
+static void __cpuinit nexgen_identify(struct cpuinfo_x86 * c)
+{
+	/* Detect NexGen with old hypercode */
+	if ( deep_magic_nexgen_probe() ) {
+		strcpy(c->x86_vendor_id, "NexGenDriven");
+	}
+}
+
+static struct cpu_dev nexgen_cpu_dev __cpuinitdata = {
+	.c_vendor	= "Nexgen",
+	.c_ident	= { "NexGenDriven" },
+	.c_models = {
+			{ .vendor = X86_VENDOR_NEXGEN,
+			  .family = 5,
+			  .model_names = { [1] = "Nx586" }
+			},
+	},
+	.c_init		= init_nexgen,
+	.c_identify	= nexgen_identify,
+};
+
+int __init nexgen_init_cpu(void)
+{
+	cpu_devs[X86_VENDOR_NEXGEN] = &nexgen_cpu_dev;
+	return 0;
+}