cpu_ops.c (2875fe0561569f82d0e63658ccf0d11ce7da8922) cpu_ops.c (cfafe260137418d0265d0df3bb18dc494af2b43e)
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>

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13#include <asm/sbi.h>
14#include <asm/smp.h>
15
16const struct cpu_operations *cpu_ops[NR_CPUS] __ro_after_init;
17
18void *__cpu_up_stack_pointer[NR_CPUS];
19void *__cpu_up_task_pointer[NR_CPUS];
20
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>

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13#include <asm/sbi.h>
14#include <asm/smp.h>
15
16const struct cpu_operations *cpu_ops[NR_CPUS] __ro_after_init;
17
18void *__cpu_up_stack_pointer[NR_CPUS];
19void *__cpu_up_task_pointer[NR_CPUS];
20
21extern const struct cpu_operations cpu_ops_sbi;
21extern const struct cpu_operations cpu_ops_spinwait;
22
23void cpu_update_secondary_bootdata(unsigned int cpuid,
24 struct task_struct *tidle)
25{
26 int hartid = cpuid_to_hartid_map(cpuid);
27
28 /* Make sure tidle is updated */
29 smp_mb();
30 WRITE_ONCE(__cpu_up_stack_pointer[hartid],
31 task_stack_page(tidle) + THREAD_SIZE);
32 WRITE_ONCE(__cpu_up_task_pointer[hartid], tidle);
33}
34
35void __init cpu_set_ops(int cpuid)
36{
22extern const struct cpu_operations cpu_ops_spinwait;
23
24void 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
36void __init cpu_set_ops(int cpuid)
37{
37 cpu_ops[cpuid] = &cpu_ops_spinwait;
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;
38}
46}