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Code Issues Releases Wiki Activity

🆕 使用rdtsc进行精确定时

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This commit is contained in:
fslongjin 2022-07-27 21:19:59 +08:00
parent 4bc64de8f9
commit 90203803d3
2 changed files with 20 additions and 10 deletions
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1
kernel/process/process.c
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@ -5,6 +5,7 @@
#include <common/stdio.h>
#include <common/compiler.h>
#include <common/libELF/elf.h>
#include <common/time.h>
#include <driver/video/video.h>
#include <driver/usb/usb.h>
#include <exception/gate.h>

29
kernel/time/sleep.c
View File

@ -4,6 +4,9 @@
#include <process/process.h>
#include <sched/sched.h>
#include <mm/slab.h>
#include <common/cpu.h>
#include <common/glib.h>
/**
* @brief nanosleep定时事件到期后，唤醒指定的进程
*
@ -24,26 +27,32 @@ void nanosleep_handler(void *pcb)
int nanosleep(const struct timespec *rqtp, struct timespec *rmtp)
{
int64_t total_ns = rqtp->tv_nsec;
// kdebug("totalns = %ld", total_ns);
if (total_ns < 0 || total_ns >= 1000000000)
return -EINVAL;
// todo: 对于小于500us的时间，使用spin/rdtsc来进行定时
if (total_ns < 50000)
return 0;
// 对于小于500us的时间，使用spin/rdtsc来进行定时
if (total_ns < 500000)
total_ns = 500000;
{
kdebug("use rdtsc to nanosleep");
uint64_t expired_tsc = rdtsc() + (total_ns * Cpu_tsc_freq) / 1000000000;
while (rdtsc() < expired_tsc)
pause();
if (rmtp != NULL)
{
rmtp->tv_nsec = 0;
rmtp->tv_sec = 0;
}
return 0;
}
// 增加定时任务
struct timer_func_list_t *sleep_task = (struct timer_func_list_t *)kmalloc(sizeof(struct timer_func_list_t), 0);
memset(sleep_task, 0, sizeof(struct timer_func_list_t));
timer_func_init_us(sleep_task, &nanosleep_handler, (void *)current_pcb, total_ns / 1000);
timer_func_add(sleep_task);
current_pcb->state = PROC_INTERRUPTIBLE;