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         clear_sched_clock_stable();
  21 }
  22
  23 static void init_transmeta(struct cpuinfo_x86 *c)
  24 {
  25         unsigned int cap_mask, uk, max, dummy;
  26         unsigned int cms_rev1, cms_rev2;
  27         unsigned int cpu_rev, cpu_freq = 0, cpu_flags, new_cpu_rev;
  28         char cpu_info[65];
  29
  30         early_init_transmeta(c);
  31
  32         cpu_detect_cache_sizes(c);
  33
  34         /* Print CMS and CPU revision */
  35         max = cpuid_eax(0x80860000);
  36         cpu_rev = 0;
  37         if (max >= 0x80860001) {
  38                 cpuid(0x80860001, &dummy, &cpu_rev, &cpu_freq, &cpu_flags);
  39                 if (cpu_rev != 0x02000000) {
  40                         pr_info("CPU: Processor revision %u.%u.%u.%u, %u MHz\n",
  41                                 (cpu_rev >> 24) & 0xff,
  42                                 (cpu_rev >> 16) & 0xff,
  43                                 (cpu_rev >> 8) & 0xff,
  44                                 cpu_rev & 0xff,
  45                                 cpu_freq);
  46                 }
  47         }
  48         if (max >= 0x80860002) {
  49                 cpuid(0x80860002, &new_cpu_rev, &cms_rev1, &cms_rev2, &dummy);
  50                 if (cpu_rev == 0x02000000) {
  51                         pr_info("CPU: Processor revision %08X, %u MHz\n",
  52                                 new_cpu_rev, cpu_freq);
  53                 }
  54                 pr_info("CPU: Code Morphing Software revision %u.%u.%u-%u-%u\n",
  55                        (cms_rev1 >> 24) & 0xff,
  56                        (cms_rev1 >> 16) & 0xff,
  57                        (cms_rev1 >> 8) & 0xff,
  58                        cms_rev1 & 0xff,
  59                        cms_rev2);
  60         }
  61         if (max >= 0x80860006) {
  62                 cpuid(0x80860003,
  63                       (void *)&cpu_info[0],
  64                       (void *)&cpu_info[4],
  65                       (void *)&cpu_info[8],
  66                       (void *)&cpu_info[12]);
  67                 cpuid(0x80860004,
  68                       (void *)&cpu_info[16],
  69                       (void *)&cpu_info[20],
  70                       (void *)&cpu_info[24],
  71                       (void *)&cpu_info[28]);
  72                 cpuid(0x80860005,
  73                       (void *)&cpu_info[32],
  74                       (void *)&cpu_info[36],
  75                       (void *)&cpu_info[40],
  76                       (void *)&cpu_info[44]);
  77                 cpuid(0x80860006,
  78                       (void *)&cpu_info[48],
  79                       (void *)&cpu_info[52],
  80                       (void *)&cpu_info[56],
  81                       (void *)&cpu_info[60]);
  82                 cpu_info[64] = '\0';
  83                 pr_info("CPU: %s\n", cpu_info);
  84         }
  85
  86         /* Unhide possibly hidden capability flags */
  87         rdmsr(0x80860004, cap_mask, uk);
  88         wrmsr(0x80860004, ~0, uk);
  89         c->x86_capability[CPUID_1_EDX] = cpuid_edx(0x00000001);
  90         wrmsr(0x80860004, cap_mask, uk);
  91
  92         /* All Transmeta CPUs have a constant TSC */
  93         set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
  94
  95 #ifdef CONFIG_SYSCTL
  96         /*
  97          * randomize_va_space slows us down enormously;
  98          * it probably triggers retranslation of x86->native bytecode
  99          */
 100         randomize_va_space = 0;
 101 #endif
 102 }
 103
 104 static const struct cpu_dev transmeta_cpu_dev = {
 105         .c_vendor       = "Transmeta",
 106         .c_ident        = { "GenuineTMx86", "TransmetaCPU" },
 107         .c_early_init   = early_init_transmeta,
 108         .c_init         = init_transmeta,
 109         .c_x86_vendor   = X86_VENDOR_TRANSMETA,
 110 };
 111
 112 cpu_dev_register(transmeta_cpu_dev);