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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 <linux/sched/task_stack.h>
12 #include <asm/cpu_ops.h>
13 #include <asm/sbi.h>
14 #include <asm/smp.h>
15
16 const struct cpu_operations *cpu_ops[NR_CPUS] __ro_after_init;
17
18 void *__cpu_up_stack_pointer[NR_CPUS];
19 void *__cpu_up_task_pointer[NR_CPUS];
20
21 extern const struct cpu_operations cpu_ops_sbi;
22 extern const struct cpu_operations cpu_ops_spinwait;
23
24 void cpu_update_secondary_bootdata(unsigned int cpuid,
25 struct task_struct *tidle)
26 {
27 int hartid = cpuid_to_hartid_map(cpuid);
28
29 /* Make sure tidle is updated */
30 smp_mb();
31 WRITE_ONCE(__cpu_up_stack_pointer[hartid],
32 task_stack_page(tidle) + THREAD_SIZE);
33 WRITE_ONCE(__cpu_up_task_pointer[hartid], tidle);
34 }
35
36 void __init cpu_set_ops(int cpuid)
37 {
38 #if IS_ENABLED(CONFIG_RISCV_SBI)
39 if (sbi_probe_extension(SBI_EXT_HSM) > 0) {
40 if (!cpuid)
41 pr_info("SBI v0.2 HSM extension detected\n");
42 cpu_ops[cpuid] = &cpu_ops_sbi;
43 } else
44 #endif
45 cpu_ops[cpuid] = &cpu_ops_spinwait;
46 }