arch/riscv64/kernel/cpu.c


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19

/**
 * @file cpu.c
 * riscv64 implementation of cpu handling.
 */

#include <apos/tcb.h>
#include <arch/cpu.h>

id_t cpu_id()
{
	/* yes, slightly weird situation where cur_tcb() call cpu_id() which
	 * gets the current tcb and returns the cpu id in the tcb, so that that
	 * id can be used to get the tcb we want. I might try to work out
	 * something slightly smarter, although this is likely not going to have
	 * basically any kind of importance for perfomance. */
	struct tcb *t;
	__asm__ volatile ("mv %0, tp\n" : "=r" (t) ::);
	return t->cpu_id;
}