1 files changed, 63 insertions, 0 deletions

diff --git a/arch/i386/kernel/cpu/nexgen.c b/arch/i386/kernel/cpu/nexgen.c
new file mode 100644
index 00000000000..30898a260a5
--- /dev/null
+++ b/arch/i386/kernel/cpu/nexgen.c
@@ -0,0 +1,63 @@
+#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 __init 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 __init init_nexgen(struct cpuinfo_x86 * c)
+{
+        c->x86_cache_size = 256; /* A few had 1 MB... */
+}
+
+static void __init nexgen_identify(struct cpuinfo_x86 * c)
+{
+        /* Detect NexGen with old hypercode */
+        if ( deep_magic_nexgen_probe() ) {
+                strcpy(c->x86_vendor_id, "NexGenDriven");
+        }
+        generic_identify(c);
+}
+
+static struct cpu_dev nexgen_cpu_dev __initdata = {
+        .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;
+}
+
+//early_arch_initcall(nexgen_init_cpu);