1#include <linux/kernel.h>
2#include <linux/init.h>
3#include <linux/string.h>
4#include <asm/processor.h>
5
6#include "cpu.h"
7
8/*
9 *	Detect a NexGen CPU running without BIOS hypercode new enough
10 *	to have CPUID. (Thanks to Herbert Oppmann)
11 */
12
13static int __cpuinit deep_magic_nexgen_probe(void)
14{
15	int ret;
16
17	__asm__ __volatile__ (
18		"	movw	$0x5555, %%ax\n"
19		"	xorw	%%dx,%%dx\n"
20		"	movw	$2, %%cx\n"
21		"	divw	%%cx\n"
22		"	movl	$0, %%eax\n"
23		"	jnz	1f\n"
24		"	movl	$1, %%eax\n"
25		"1:\n"
26		: "=a" (ret) : : "cx", "dx" );
27	return  ret;
28}
29
30static void __cpuinit init_nexgen(struct cpuinfo_x86 * c)
31{
32	c->x86_cache_size = 256; /* A few had 1 MB... */
33}
34
35static void __cpuinit nexgen_identify(struct cpuinfo_x86 * c)
36{
37	/* Detect NexGen with old hypercode */
38	if ( deep_magic_nexgen_probe() ) {
39		strcpy(c->x86_vendor_id, "NexGenDriven");
40	}
41}
42
43static struct cpu_dev nexgen_cpu_dev __cpuinitdata = {
44	.c_vendor	= "Nexgen",
45	.c_ident	= { "NexGenDriven" },
46	.c_models = {
47			{ .vendor = X86_VENDOR_NEXGEN,
48			  .family = 5,
49			  .model_names = { [1] = "Nx586" }
50			},
51	},
52	.c_init		= init_nexgen,
53	.c_identify	= nexgen_identify,
54};
55
56int __init nexgen_init_cpu(void)
57{
58	cpu_devs[X86_VENDOR_NEXGEN] = &nexgen_cpu_dev;
59	return 0;
60}
61