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[NR_CPUS] __ro_after_init;
17
18extern const struct cpu_operations cpu_ops_sbi;
19#ifndef CONFIG_RISCV_BOOT_SPINWAIT
20const struct cpu_operations cpu_ops_spinwait = {
21	.name		= "",
22	.cpu_prepare	= NULL,
23	.cpu_start	= NULL,
24};
25#endif
26
27void __init cpu_set_ops(int cpuid)
28{
29#if IS_ENABLED(CONFIG_RISCV_SBI)
30	if (sbi_probe_extension(SBI_EXT_HSM) > 0) {
31		if (!cpuid)
32			pr_info("SBI HSM extension detected\n");
33		cpu_ops[cpuid] = &cpu_ops_sbi;
34	} else
35#endif
36		cpu_ops[cpuid] = &cpu_ops_spinwait;
37}