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/* SPDX-License-Identifier: GPL-3.0-or-later */
/* Copyright 2021 - 2022, Kim Kuparinen < kimi.h.kuparinen@gmail.com > */
/**
* @file cpu.c
* riscv64 implementation of cpu handling.
*/
#include <apos/tcb.h>
#include <apos/atomic.h>
#include <arch/cpu.h>
/** Keeps track of initialized cpus. */
static atomic_long cpus = 0;
void cpu_assign(struct tcb *t)
{
/* bounce cpu id forward, or if first time here, get a cpu id */
struct tcb *c = cur_tcb();
if (likely(c))
t->cpu_id = c->cpu_id;
else
t->cpu_id = cpus++;
__asm__ volatile ("mv tp, %0\n" : : "r" (t) :);
}
id_t cpu_id()
{
struct tcb *t = cur_tcb();
return t->cpu_id;
}
/* override cur_tcb() in common/tcb.c since on risc-v this is apparently the
* optimal strategy. */
/* @todo should this be the default for all arches? */
struct tcb *cur_tcb()
{
register struct tcb *t __asm__ ("tp");
return t;
}
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