arch/riscv/include/asm/timex.h

   1 /*
   2  * Copyright (C) 2012 Regents of the University of California
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful,
   9  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  *   GNU General Public License for more details.
  12  */
  13
  14 #ifndef _ASM_RISCV_TIMEX_H
  15 #define _ASM_RISCV_TIMEX_H
  16
  17 #include <asm/param.h>
  18
  19 typedef unsigned long cycles_t;
  20
  21 static inline cycles_t get_cycles_inline(void)
  22 {
  23         cycles_t n;
  24
  25         __asm__ __volatile__ (
  26                 "rdtime %0"
  27                 : "=r" (n));
  28         return n;
  29 }
  30 #define get_cycles get_cycles_inline
  31
  32 #ifdef CONFIG_64BIT
  33 static inline uint64_t get_cycles64(void)
  34 {
  35         return get_cycles();
  36 }
  37 #else
  38 static inline uint64_t get_cycles64(void)
  39 {
  40         u32 lo, hi, tmp;
  41         __asm__ __volatile__ (
  42                 "1:\n"
  43                 "rdtimeh %0\n"
  44                 "rdtime %1\n"
  45                 "rdtimeh %2\n"
  46                 "bne %0, %2, 1b"
  47                 : "=&r" (hi), "=&r" (lo), "=&r" (tmp));
  48         return ((u64)hi << 32) | lo;
  49 }
  50 #endif
  51
  52 #define ARCH_HAS_READ_CURRENT_TIMER
  53
  54 static inline int read_current_timer(unsigned long *timer_val)
  55 {
  56         *timer_val = get_cycles();
  57         return 0;
  58 }
  59
  60 #endif /* _ASM_RISCV_TIMEX_H */