LXR linux/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
  10static 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
  22static 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
 103static 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
 111cpu_dev_register(transmeta_cpu_dev);
 112