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Diff for /src/sys/arch/x86/x86/tsc.c between version 1.37.4.2 and 1.38

version 1.37.4.2, 2020/04/21 18:42:12 version 1.38, 2020/02/21 00:26:22
Line 135  tsc_is_invariant(void)
Line 135  tsc_is_invariant(void)
                 x86_cpuid(0x80000000, descs);                  x86_cpuid(0x80000000, descs);
                 if (descs[0] >= 0x80000007) {                  if (descs[0] >= 0x80000007) {
                         x86_cpuid(0x80000007, descs);                          x86_cpuid(0x80000007, descs);
                         invariant = (descs[3] & CPUID_APM_ITSC) != 0;                          invariant = (descs[3] & CPUID_APM_TSC) != 0;
                 }                  }
         }          }
   
         return invariant;          return invariant;
 }  }
   
 /*  
  * Initialize timecounter(9) of TSC.  
  * This function is called after all secondary processors were up and  
  * calculated the drift.  
  */  
 void  void
 tsc_tc_init(void)  tsc_tc_init(void)
 {  {
Line 206  tsc_read_bp(struct cpu_info *ci, uint64_
Line 201  tsc_read_bp(struct cpu_info *ci, uint64_
   
         /* Flag it and read our TSC. */          /* Flag it and read our TSC. */
         atomic_or_uint(&ci->ci_flags, CPUF_SYNCTSC);          atomic_or_uint(&ci->ci_flags, CPUF_SYNCTSC);
         bptsc = (rdtsc() >> 1);          bptsc = cpu_counter_serializing() >> 1;
   
         /* Wait for remote to complete, and read ours again. */          /* Wait for remote to complete, and read ours again. */
         while ((ci->ci_flags & CPUF_SYNCTSC) != 0) {          while ((ci->ci_flags & CPUF_SYNCTSC) != 0) {
                 __insn_barrier();                  __insn_barrier();
         }          }
         bptsc += (rdtsc() >> 1);          bptsc += (cpu_counter_serializing() >> 1);
   
         /* Wait for the results to come in. */          /* Wait for the results to come in. */
         while (tsc_sync_cpu == ci) {          while (tsc_sync_cpu == ci) {
Line 251  tsc_post_ap(struct cpu_info *ci)
Line 246  tsc_post_ap(struct cpu_info *ci)
         while ((ci->ci_flags & CPUF_SYNCTSC) == 0) {          while ((ci->ci_flags & CPUF_SYNCTSC) == 0) {
                 __insn_barrier();                  __insn_barrier();
         }          }
         tsc = (rdtsc() >> 1);          tsc = (cpu_counter_serializing() >> 1);
   
         /* Instruct primary to read its counter. */          /* Instruct primary to read its counter. */
         atomic_and_uint(&ci->ci_flags, ~CPUF_SYNCTSC);          atomic_and_uint(&ci->ci_flags, ~CPUF_SYNCTSC);
         tsc += (rdtsc() >> 1);          tsc += (cpu_counter_serializing() >> 1);
   
         /* Post result.  Ensure the whole value goes out atomically. */          /* Post result.  Ensure the whole value goes out atomically. */
         (void)atomic_swap_64(&tsc_sync_val, tsc);          (void)atomic_swap_64(&tsc_sync_val, tsc);
Legend:
Removed from v.1.37.4.2  
changed lines
  Added in v.1.38
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