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transmeta.c

#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;
}

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