| 1 | // SPDX-License-Identifier: GPL-2.0-only |
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| 2 | /* |
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| 3 | * Copyright (c) 2020 Western Digital Corporation or its affiliates. |
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| 4 | */ |
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| 5 | |
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| 6 | #include <linux/errno.h> |
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| 7 | #include <linux/mm.h> |
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| 8 | #include <linux/of.h> |
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| 9 | #include <linux/string.h> |
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| 10 | #include <linux/sched.h> |
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| 11 | #include <asm/cpu_ops.h> |
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| 12 | #include <asm/cpu_ops_sbi.h> |
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| 13 | #include <asm/sbi.h> |
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| 14 | #include <asm/smp.h> |
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| 15 | |
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| 16 | const struct cpu_operations *cpu_ops __ro_after_init = &cpu_ops_spinwait; |
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| 17 | |
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| 18 | extern const struct cpu_operations cpu_ops_sbi; |
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| 19 | #ifndef CONFIG_RISCV_BOOT_SPINWAIT |
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| 20 | const struct cpu_operations cpu_ops_spinwait = { |
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| 21 | .cpu_start = NULL, |
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| 22 | }; |
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| 23 | #endif |
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| 24 | |
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| 25 | void __init cpu_set_ops(void) |
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| 26 | { |
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| 27 | #if IS_ENABLED(CONFIG_RISCV_SBI) |
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| 28 | if (sbi_probe_extension(SBI_EXT_HSM)) { |
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| 29 | pr_info("SBI HSM extension detected\n" ); |
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| 30 | cpu_ops = &cpu_ops_sbi; |
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| 31 | } |
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| 32 | #endif |
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| 33 | } |
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| 34 | |
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