lib/librte_eal/common/include/arch/ppc_64/rte_cycles.h

   1 /*
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  * Copyright (C) IBM Corporation 2014.
   4  */
   5
   6 #ifndef _RTE_CYCLES_PPC_64_H_
   7 #define _RTE_CYCLES_PPC_64_H_
   8
   9 #ifdef __cplusplus
  10 extern "C" {
  11 #endif
  12
  13 #include "generic/rte_cycles.h"
  14
  15 #include <rte_byteorder.h>
  16 #include <rte_common.h>
  17
  18 /**
  19  * Read the time base register.
  20  *
  21  * @return
  22  *   The time base for this lcore.
  23  */
  24 static inline uint64_t
  25 rte_rdtsc(void)
  26 {
  27         union {
  28                 uint64_t tsc_64;
  29                 RTE_STD_C11
  30                 struct {
  31 #if RTE_BYTE_ORDER == RTE_BIG_ENDIAN
  32                         uint32_t hi_32;
  33                         uint32_t lo_32;
  34 #else
  35                         uint32_t lo_32;
  36                         uint32_t hi_32;
  37 #endif
  38                 };
  39         } tsc;
  40         uint32_t tmp;
  41
  42         asm volatile(
  43                         "0:\n"
  44                         "mftbu   %[hi32]\n"
  45                         "mftb    %[lo32]\n"
  46                         "mftbu   %[tmp]\n"
  47                         "cmpw    %[tmp],%[hi32]\n"
  48                         "bne     0b\n"
  49                         : [hi32] "=r"(tsc.hi_32), [lo32] "=r"(tsc.lo_32),
  50                         [tmp] "=r"(tmp)
  51                     );
  52         return tsc.tsc_64;
  53 }
  54
  55 static inline uint64_t
  56 rte_rdtsc_precise(void)
  57 {
  58         rte_mb();
  59         return rte_rdtsc();
  60 }
  61
  62 static inline uint64_t
  63 rte_get_tsc_cycles(void) { return rte_rdtsc(); }
  64
  65 #ifdef __cplusplus
  66 }
  67 #endif
  68
  69 #endif /* _RTE_CYCLES_PPC_64_H_ */