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Diffstat (limited to 'arch/i386/kernel/cpu/nexgen.c')
-rw-r--r--arch/i386/kernel/cpu/nexgen.c63
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 000000000000..30898a260a5c
--- /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);