arch/riscv/kernel/cpu_ops.c

   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 }