arch/x86/kernel/cpu/transmeta.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/kernel.h>
   3 #include <linux/sched.h>
   4 #include <linux/sched/clock.h>
   5 #include <linux/mm.h>
   6 #include <asm/cpufeature.h>
   7 #include <asm/msr.h>
   8 #include "cpu.h"
   9
  10 static void early_init_transmeta(struct cpuinfo_x86 *c)
  11 {
  12         u32 xlvl;
  13
  14         /* Transmeta-defined flags: level 0x80860001 */
  15         xlvl = cpuid_eax(0x80860000);
  16         if ((xlvl & 0xffff0000) == 0x80860000) {
  17                 if (xlvl >= 0x80860001)
  18                         c->x86_capability[CPUID_8086_0001_EDX] = cpuid_edx(0x80860001);
  19         }
  20 }
  21
  22 static void init_transmeta(struct cpuinfo_x86 *c)
  23 {
  24         unsigned int cap_mask, uk, max, dummy;
  25         unsigned int cms_rev1, cms_rev2;
  26         unsigned int cpu_rev, cpu_freq = 0, cpu_flags, new_cpu_rev;
  27         char cpu_info[65];
  28
  29         early_init_transmeta(c);
  30
  31         cpu_detect_cache_sizes(c);
  32
  33         /* Print CMS and CPU revision */
  34         max = cpuid_eax(0x80860000);
  35         cpu_rev = 0;
  36         if (max >= 0x80860001) {
  37                 cpuid(0x80860001, &dummy, &cpu_rev, &cpu_freq, &cpu_flags);
  38                 if (cpu_rev != 0x02000000) {
  39                         pr_info("CPU: Processor revision %u.%u.%u.%u, %u MHz\n",
  40                                 (cpu_rev >> 24) & 0xff,
  41                                 (cpu_rev >> 16) & 0xff,
  42                                 (cpu_rev >> 8) & 0xff,
  43                                 cpu_rev & 0xff,
  44                                 cpu_freq);
  45                 }
  46         }
  47         if (max >= 0x80860002) {
  48                 cpuid(0x80860002, &new_cpu_rev, &cms_rev1, &cms_rev2, &dummy);
  49                 if (cpu_rev == 0x02000000) {
  50                         pr_info("CPU: Processor revision %08X, %u MHz\n",
  51                                 new_cpu_rev, cpu_freq);
  52                 }
  53                 pr_info("CPU: Code Morphing Software revision %u.%u.%u-%u-%u\n",
  54                        (cms_rev1 >> 24) & 0xff,
  55                        (cms_rev1 >> 16) & 0xff,
  56                        (cms_rev1 >> 8) & 0xff,
  57                        cms_rev1 & 0xff,
  58                        cms_rev2);
  59         }
  60         if (max >= 0x80860006) {
  61                 cpuid(0x80860003,
  62                       (void *)&cpu_info[0],
  63                       (void *)&cpu_info[4],
  64                       (void *)&cpu_info[8],
  65                       (void *)&cpu_info[12]);
  66                 cpuid(0x80860004,
  67                       (void *)&cpu_info[16],
  68                       (void *)&cpu_info[20],
  69                       (void *)&cpu_info[24],
  70                       (void *)&cpu_info[28]);
  71                 cpuid(0x80860005,
  72                       (void *)&cpu_info[32],
  73                       (void *)&cpu_info[36],
  74                       (void *)&cpu_info[40],
  75                       (void *)&cpu_info[44]);
  76                 cpuid(0x80860006,
  77                       (void *)&cpu_info[48],
  78                       (void *)&cpu_info[52],
  79                       (void *)&cpu_info[56],
  80                       (void *)&cpu_info[60]);
  81                 cpu_info[64] = '\0';
  82                 pr_info("CPU: %s\n", cpu_info);
  83         }
  84
  85         /* Unhide possibly hidden capability flags */
  86         rdmsr(0x80860004, cap_mask, uk);
  87         wrmsr(0x80860004, ~0, uk);
  88         c->x86_capability[CPUID_1_EDX] = cpuid_edx(0x00000001);
  89         wrmsr(0x80860004, cap_mask, uk);
  90
  91         /* All Transmeta CPUs have a constant TSC */
  92         set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
  93
  94 #ifdef CONFIG_SYSCTL
  95         /*
  96          * randomize_va_space slows us down enormously;
  97          * it probably triggers retranslation of x86->native bytecode
  98          */
  99         randomize_va_space = 0;
 100 #endif
 101 }
 102
 103 static const struct cpu_dev transmeta_cpu_dev = {
 104         .c_vendor       = "Transmeta",
 105         .c_ident        = { "GenuineTMx86", "TransmetaCPU" },
 106         .c_early_init   = early_init_transmeta,
 107         .c_init         = init_transmeta,
 108         .c_x86_vendor   = X86_VENDOR_TRANSMETA,
 109 };
 110
 111 cpu_dev_register(transmeta_cpu_dev);