cpu_ops.c

 1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * Copyright (c) 2020 Western Digital Corporation or its affiliates.
 4 */
 5
 6#include <linux/errno.h>
 7#include <linux/mm.h>
 8#include <linux/of.h>
 9#include <linux/string.h>
10#include <linux/sched.h>
11#include <asm/cpu_ops.h>
12#include <asm/cpu_ops_sbi.h>
13#include <asm/sbi.h>
14#include <asm/smp.h>
15
16const struct cpu_operations *cpu_ops __ro_after_init = &cpu_ops_spinwait;
17
18extern const struct cpu_operations cpu_ops_sbi;
19#ifndef CONFIG_RISCV_BOOT_SPINWAIT
20const struct cpu_operations cpu_ops_spinwait = {
21	.cpu_start	= NULL,
22};
23#endif
24
25void __init cpu_set_ops(void)
26{
27#if IS_ENABLED(CONFIG_RISCV_SBI)
28	if (sbi_probe_extension(SBI_EXT_HSM)) {
29		pr_info("SBI HSM extension detected\n");
30		cpu_ops = &cpu_ops_sbi;
31	}
32#endif
33}