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
16 const struct cpu_operations *cpu_ops __ro_after_init = &cpu_ops_spinwait;
17
18 extern const struct cpu_operations cpu_ops_sbi;
19 #ifndef CONFIG_RISCV_BOOT_SPINWAIT
20 const struct cpu_operations cpu_ops_spinwait = {
21 .cpu_start = NULL,
22 };
23 #endif
24
25 void __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 }
34
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