| // SPDX-License-Identifier: GPL-2.0-only |
| * Copyright (c) 2020 Western Digital Corporation or its affiliates. |
| #include <linux/string.h> |
| const struct cpu_operations cpu_ops_spinwait; |
| static int spinwait_cpu_prepare(unsigned int cpuid) |
| if (!cpu_ops_spinwait.cpu_start) { |
| pr_err("cpu start method not defined for CPU [%d]\n", cpuid); |
| static int spinwait_cpu_start(unsigned int cpuid, struct task_struct *tidle) |
| * In this protocol, all cpus boot on their own accord. _start |
| * selects the first cpu to boot the kernel and causes the remainder |
| * of the cpus to spin in a loop waiting for their stack pointer to be |
| * setup by that main cpu. Writing to bootdata |
| * (i.e __cpu_up_stack_pointer) signals to the spinning cpus that they |
| * can continue the boot process. |
| cpu_update_secondary_bootdata(cpuid, tidle); |
| const struct cpu_operations cpu_ops_spinwait = { |
| .cpu_prepare = spinwait_cpu_prepare, |
| .cpu_start = spinwait_cpu_start, |