com32/include/sys/cpu.h

   1 #ifndef _CPU_H
   2 #define _CPU_H
   3
   4 #include <inttypes.h>
   5
   6 static inline uint64_t rdtsc(void)
   7 {
   8   uint64_t v;
   9   asm volatile("rdtsc" : "=A" (v));
  10   return v;
  11 }
  12
  13 static inline uint32_t rdtscl(void)
  14 {
  15   uint32_t v;
  16   asm volatile("rdtsc" : "=a" (v) : : "edx");
  17   return v;
  18 }
  19
  20 static inline uint32_t cpuid_eax(uint32_t level)
  21 {
  22   uint32_t v;
  23
  24   asm("cpuid" : "=a" (v) : "a" (level) : "ebx", "ecx", "edx");
  25   return v;
  26 }
  27 static inline uint32_t cpuid_ebx(uint32_t level)
  28 {
  29   uint32_t v;
  30
  31   asm("cpuid" : "=b" (v),  "+a" (level) : : "ecx", "edx");
  32   return v;
  33 }
  34 static inline uint32_t cpuid_ecx(uint32_t level)
  35 {
  36   uint32_t v;
  37
  38   asm("cpuid" : "=c" (v), "+a" (level) : : "ebx", "edx");
  39   return v;
  40 }
  41 static inline uint32_t cpuid_edx(uint32_t level)
  42 {
  43   uint32_t v;
  44
  45   asm("cpuid" : "=d" (v), "+a" (level) : : "ebx", "ecx");
  46   return v;
  47 }
  48
  49 static inline uint64_t rdmsr(uint32_t msr)
  50 {
  51   uint64_t v;
  52
  53   asm volatile("rdmsr" : "=A" (v) : "c" (msr));
  54   return v;
  55 }
  56 static inline void wrmsr(uint64_t v, uint32_t msr)
  57 {
  58   asm volatile("wrmsr" : : "A" (v), "c" (msr));
  59 }
  60
  61 static inline void cpu_relax(void)
  62 {
  63   asm volatile("rep ; nop");
  64 }
  65
  66 /* These are local cli/sti; not SMP-safe!!! */
  67
  68 static inline void cli(void)
  69 {
  70   asm volatile("cli");
  71 }
  72
  73 static inline void sti(void)
  74 {
  75   asm volatile("sti");
  76 }
  77
  78 #endif