1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2020 Western Digital Corporation or its affiliates.
6 #include <linux/errno.h>
9 #include <linux/string.h>
10 #include <linux/sched.h>
11 #include <linux/sched/task_stack.h>
12 #include <asm/cpu_ops.h>
16 const struct cpu_operations *cpu_ops[NR_CPUS] __ro_after_init;
18 void *__cpu_up_stack_pointer[NR_CPUS] __section(".data");
19 void *__cpu_up_task_pointer[NR_CPUS] __section(".data");
21 extern const struct cpu_operations cpu_ops_sbi;
22 extern const struct cpu_operations cpu_ops_spinwait;
24 void cpu_update_secondary_bootdata(unsigned int cpuid,
25 struct task_struct *tidle)
27 int hartid = cpuid_to_hartid_map(cpuid);
29 /* Make sure tidle is updated */
31 WRITE_ONCE(__cpu_up_stack_pointer[hartid],
32 task_stack_page(tidle) + THREAD_SIZE);
33 WRITE_ONCE(__cpu_up_task_pointer[hartid], tidle);
36 void __init cpu_set_ops(int cpuid)
38 #if IS_ENABLED(CONFIG_RISCV_SBI)
39 if (sbi_probe_extension(SBI_EXT_HSM) > 0) {
41 pr_info("SBI v0.2 HSM extension detected\n");
42 cpu_ops[cpuid] = &cpu_ops_sbi;
45 cpu_ops[cpuid] = &cpu_ops_spinwait;