arch/x86/kernel/cpu/transmeta.c

   1 #include <linux/kernel.h>
   2 #include <linux/sched.h>
   3 #include <linux/sched/clock.h>
   4 #include <linux/mm.h>
   5 #include <asm/cpufeature.h>
   6 #include <asm/msr.h>
   7 #include "cpu.h"
   8
   9 static void early_init_transmeta(struct cpuinfo_x86 *c)
  10 {
  11         u32 xlvl;
  12
  13         /* Transmeta-defined flags: level 0x80860001 */
  14         xlvl = cpuid_eax(0x80860000);
  15         if ((xlvl & 0xffff0000) == 0x80860000) {
  16                 if (xlvl >= 0x80860001)
  17                         c->x86_capability[CPUID_8086_0001_EDX] = cpuid_edx(0x80860001);
  18         }
  19 }
  20
  21 static void init_transmeta(struct cpuinfo_x86 *c)
  22 {
  23         unsigned int cap_mask, uk, max, dummy;
  24         unsigned int cms_rev1, cms_rev2;
  25         unsigned int cpu_rev, cpu_freq = 0, cpu_flags, new_cpu_rev;
  26         char cpu_info[65];
  27
  28         early_init_transmeta(c);
  29
  30         cpu_detect_cache_sizes(c);
  31
  32         /* Print CMS and CPU revision */
  33         max = cpuid_eax(0x80860000);
  34         cpu_rev = 0;
  35         if (max >= 0x80860001) {
  36                 cpuid(0x80860001, &dummy, &cpu_rev, &cpu_freq, &cpu_flags);
  37                 if (cpu_rev != 0x02000000) {
  38                         pr_info("CPU: Processor revision %u.%u.%u.%u, %u MHz\n",
  39                                 (cpu_rev >> 24) & 0xff,
  40                                 (cpu_rev >> 16) & 0xff,
  41                                 (cpu_rev >> 8) & 0xff,
  42                                 cpu_rev & 0xff,
  43                                 cpu_freq);
  44                 }
  45         }
  46         if (max >= 0x80860002) {
  47                 cpuid(0x80860002, &new_cpu_rev, &cms_rev1, &cms_rev2, &dummy);
  48                 if (cpu_rev == 0x02000000) {
  49                         pr_info("CPU: Processor revision %08X, %u MHz\n",
  50                                 new_cpu_rev, cpu_freq);
  51                 }
  52                 pr_info("CPU: Code Morphing Software revision %u.%u.%u-%u-%u\n",
  53                        (cms_rev1 >> 24) & 0xff,
  54                        (cms_rev1 >> 16) & 0xff,
  55                        (cms_rev1 >> 8) & 0xff,
  56                        cms_rev1 & 0xff,
  57                        cms_rev2);
  58         }
  59         if (max >= 0x80860006) {
  60                 cpuid(0x80860003,
  61                       (void *)&cpu_info[0],
  62                       (void *)&cpu_info[4],
  63                       (void *)&cpu_info[8],
  64                       (void *)&cpu_info[12]);
  65                 cpuid(0x80860004,
  66                       (void *)&cpu_info[16],
  67                       (void *)&cpu_info[20],
  68                       (void *)&cpu_info[24],
  69                       (void *)&cpu_info[28]);
  70                 cpuid(0x80860005,
  71                       (void *)&cpu_info[32],
  72                       (void *)&cpu_info[36],
  73                       (void *)&cpu_info[40],
  74                       (void *)&cpu_info[44]);
  75                 cpuid(0x80860006,
  76                       (void *)&cpu_info[48],
  77                       (void *)&cpu_info[52],
  78                       (void *)&cpu_info[56],
  79                       (void *)&cpu_info[60]);
  80                 cpu_info[64] = '\0';
  81                 pr_info("CPU: %s\n", cpu_info);
  82         }
  83
  84         /* Unhide possibly hidden capability flags */
  85         rdmsr(0x80860004, cap_mask, uk);
  86         wrmsr(0x80860004, ~0, uk);
  87         c->x86_capability[CPUID_1_EDX] = cpuid_edx(0x00000001);
  88         wrmsr(0x80860004, cap_mask, uk);
  89
  90         /* All Transmeta CPUs have a constant TSC */
  91         set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
  92
  93 #ifdef CONFIG_SYSCTL
  94         /*
  95          * randomize_va_space slows us down enormously;
  96          * it probably triggers retranslation of x86->native bytecode
  97          */
  98         randomize_va_space = 0;
  99 #endif
 100 }
 101
 102 static const struct cpu_dev transmeta_cpu_dev = {
 103         .c_vendor       = "Transmeta",
 104         .c_ident        = { "GenuineTMx86", "TransmetaCPU" },
 105         .c_early_init   = early_init_transmeta,
 106         .c_init         = init_transmeta,
 107         .c_x86_vendor   = X86_VENDOR_TRANSMETA,
 108 };
 109
 110 cpu_dev_register(transmeta_cpu_dev);