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#define _POSIX_MONOTONIC_CLOCK 200809L
#define _POSIX_TIMERS
#include <errno.h>
#include <metal/drivers/riscv_cpu.h>
#include <metal/machine.h>
#include <time.h>
#ifdef MTIME_RATE_HZ_DEF
#undef MTIME_RATE_HZ
#define MTIME_RATE_HZ MTIME_RATE_HZ_DEF
#endif
#ifndef MTIME_RATE_HZ
#define MTIME_RATE_HZ 32768
#endif
#if !defined(mtime_interrupt_controller) && \
defined(__METAL_DT_RISCV_CLINT0_HANDLE)
#define mtime_interrupt_controller __METAL_DT_RISCV_CLINT0_HANDLE
#endif
#if !defined(mtime_interrupt_controller) && \
defined(__METAL_DT_SIFIVE_CLIC0_HANDLE)
#define mtime_interrupt_controller __METAL_DT_SIFIVE_CLIC0_HANDLE
#endif
int clock_getres(clockid_t clk_id, struct timespec *res) {
switch (clk_id) {
case CLOCK_MONOTONIC:
res->tv_sec = 0;
res->tv_nsec = 1000000000 / MTIME_RATE_HZ;
return 0;
break;
default:
errno = EINVAL;
return -1;
}
}
int clock_gettime(clockid_t clk_id, struct timespec *tp) {
unsigned long long ticks;
switch (clk_id) {
case CLOCK_MONOTONIC:
mtime_interrupt_controller->vtable->command_request(
mtime_interrupt_controller, METAL_TIMER_MTIME_GET, &ticks);
tp->tv_sec = ticks / MTIME_RATE_HZ;
tp->tv_nsec = ((ticks % (MTIME_RATE_HZ)) * 1000000000) / MTIME_RATE_HZ;
return 0;
break;
default:
errno = EINVAL;
return -1;
}
}
int clock_settime(clockid_t clk_id, const struct timespec *tp) {
errno = EINVAL;
return -1;
}
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