riscv-operating-system-mooc/code/os/11-syscall/user.c

#include "os.h"

#include "user_api.h"

#define DELAY 4000

void user_task0(void)
{
	uart_puts("Task 0: Created!\n");

	unsigned int hid = -1;

	/*
	 * if syscall is supported, this will trigger exception, 
	 * code = 2 (Illegal instruction)
	 */
	//hid = r_mhartid();
	//printf("hart id is %d\n", hid);

#ifdef CONFIG_SYSCALL
	int ret = -1;
	ret = gethid(&hid);
	//ret = gethid(NULL);
	if (!ret) {
		printf("system call returned!, hart id is %d\n", hid);
	} else {
		printf("gethid() failed, return: %d\n", ret);
	}
#endif

	while (1){
		uart_puts("Task 0: Running... \n");
		task_delay(DELAY);
	}
}

void user_task1(void)
{
	uart_puts("Task 1: Created!\n");
	while (1) {
		uart_puts("Task 1: Running... \n");
		task_delay(DELAY);
	}
}

/* NOTICE: DON'T LOOP INFINITELY IN main() */
void os_main(void)
{
	task_create(user_task0);
	task_create(user_task1);
}