transmeta.c

linux 内核源代码

#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <asm/processor.h>
#include <asm/msr.h>
#include "cpu.h"

static void __cpuinit init_transmeta(struct cpuinfo_x86 *c)
{
	unsigned int cap_mask, uk, max, dummy;
	unsigned int cms_rev1, cms_rev2;
	unsigned int cpu_rev, cpu_freq = 0, cpu_flags, new_cpu_rev;
	char cpu_info[65];

	get_model_name(c);	/* Same as AMD/Cyrix */
	display_cacheinfo(c);

	/* Print CMS and CPU revision */
	max = cpuid_eax(0x80860000);
	cpu_rev = 0;
	if ( max >= 0x80860001 ) {
		cpuid(0x80860001, &dummy, &cpu_rev, &cpu_freq, &cpu_flags); 
		if (cpu_rev != 0x02000000) {
			printk(KERN_INFO "CPU: Processor revision %u.%u.%u.%u, %u MHz\n",
				(cpu_rev >> 24) & 0xff,
				(cpu_rev >> 16) & 0xff,
				(cpu_rev >> 8) & 0xff,
				cpu_rev & 0xff,
				cpu_freq);
		}
	}
	if ( max >= 0x80860002 ) {
		cpuid(0x80860002, &new_cpu_rev, &cms_rev1, &cms_rev2, &dummy);
		if (cpu_rev == 0x02000000) {
			printk(KERN_INFO "CPU: Processor revision %08X, %u MHz\n",
				new_cpu_rev, cpu_freq);
		}
		printk(KERN_INFO "CPU: Code Morphing Software revision %u.%u.%u-%u-%u\n",
		       (cms_rev1 >> 24) & 0xff,
		       (cms_rev1 >> 16) & 0xff,
		       (cms_rev1 >> 8) & 0xff,
		       cms_rev1 & 0xff,
		       cms_rev2);
	}
	if ( max >= 0x80860006 ) {
		cpuid(0x80860003,
		      (void *)&cpu_info[0],
		      (void *)&cpu_info[4],
		      (void *)&cpu_info[8],
		      (void *)&cpu_info[12]);
		cpuid(0x80860004,
		      (void *)&cpu_info[16],
		      (void *)&cpu_info[20],
		      (void *)&cpu_info[24],
		      (void *)&cpu_info[28]);
		cpuid(0x80860005,
		      (void *)&cpu_info[32],
		      (void *)&cpu_info[36],
		      (void *)&cpu_info[40],
		      (void *)&cpu_info[44]);
		cpuid(0x80860006,
		      (void *)&cpu_info[48],
		      (void *)&cpu_info[52],
		      (void *)&cpu_info[56],
		      (void *)&cpu_info[60]);
		cpu_info[64] = '\0';
		printk(KERN_INFO "CPU: %s\n", cpu_info);
	}

	/* Unhide possibly hidden capability flags */
	rdmsr(0x80860004, cap_mask, uk);
	wrmsr(0x80860004, ~0, uk);
	c->x86_capability[0] = cpuid_edx(0x00000001);
	wrmsr(0x80860004, cap_mask, uk);

	/* All Transmeta CPUs have a constant TSC */
	set_bit(X86_FEATURE_CONSTANT_TSC, c->x86_capability);
	
	/* If we can run i686 user-space code, call us an i686 */
#define USER686 ((1 << X86_FEATURE_TSC)|\
		 (1 << X86_FEATURE_CX8)|\
		 (1 << X86_FEATURE_CMOV))
        if (c->x86 == 5 && (c->x86_capability[0] & USER686) == USER686)
		c->x86 = 6;

#ifdef CONFIG_SYSCTL
	/* randomize_va_space slows us down enormously;
	   it probably triggers retranslation of x86->native bytecode */
	randomize_va_space = 0;
#endif
}

static void __cpuinit transmeta_identify(struct cpuinfo_x86 * c)
{
	u32 xlvl;

	/* Transmeta-defined flags: level 0x80860001 */
	xlvl = cpuid_eax(0x80860000);
	if ( (xlvl & 0xffff0000) == 0x80860000 ) {
		if (  xlvl >= 0x80860001 )
			c->x86_capability[2] = cpuid_edx(0x80860001);
	}
}

static struct cpu_dev transmeta_cpu_dev __cpuinitdata = {
	.c_vendor	= "Transmeta",
	.c_ident	= { "GenuineTMx86", "TransmetaCPU" },
	.c_init		= init_transmeta,
	.c_identify	= transmeta_identify,
};

int __init transmeta_init_cpu(void)
{
	cpu_devs[X86_VENDOR_TRANSMETA] = &transmeta_cpu_dev;
	return 0;
}