arch/x86/kernel/cpu/centaur_64.c

   1 #include <linux/init.h>
   2 #include <linux/smp.h>
   3
   4 #include <asm/cpufeature.h>
   5 #include <asm/processor.h>
   6
   7 #include "cpu.h"
   8
   9 static void __cpuinit early_init_centaur(struct cpuinfo_x86 *c)
  10 {
  11         if (c->x86 == 0x6 && c->x86_model >= 0xf)
  12                 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
  13
  14         set_cpu_cap(c, X86_FEATURE_SYSENTER32);
  15 }
  16
  17 static void __cpuinit init_centaur(struct cpuinfo_x86 *c)
  18 {
  19         /* Cache sizes */
  20         unsigned n;
  21
  22         n = c->extended_cpuid_level;
  23         if (n >= 0x80000008) {
  24                 unsigned eax = cpuid_eax(0x80000008);
  25                 c->x86_virt_bits = (eax >> 8) & 0xff;
  26                 c->x86_phys_bits = eax & 0xff;
  27         }
  28
  29         if (c->x86 == 0x6 && c->x86_model >= 0xf) {
  30                 c->x86_cache_alignment = c->x86_clflush_size * 2;
  31                 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
  32                 set_cpu_cap(c, X86_FEATURE_REP_GOOD);
  33         }
  34         set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
  35 }
  36
  37 static struct cpu_dev centaur_cpu_dev __cpuinitdata = {
  38         .c_vendor       = "Centaur",
  39         .c_ident        = { "CentaurHauls" },
  40         .c_early_init   = early_init_centaur,
  41         .c_init         = init_centaur,
  42 };
  43
  44 cpu_vendor_dev_register(X86_VENDOR_CENTAUR, &centaur_cpu_dev);
  45