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150 lines
4.1 KiB
150 lines
4.1 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 1996-2000 Russell King - Converted to ARM. |
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* Original Copyright (C) 1995 Linus Torvalds |
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*/ |
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#include <linux/cpu.h> |
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#include <linux/delay.h> |
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#include <linux/reboot.h> |
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#include <asm/cacheflush.h> |
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#include <asm/idmap.h> |
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#include <asm/virt.h> |
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#include "reboot.h" |
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typedef void (*phys_reset_t)(unsigned long, bool); |
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/* |
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* Function pointers to optional machine specific functions |
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*/ |
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void (*arm_pm_restart)(enum reboot_mode reboot_mode, const char *cmd); |
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void (*pm_power_off)(void); |
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EXPORT_SYMBOL(pm_power_off); |
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/* |
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* A temporary stack to use for CPU reset. This is static so that we |
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* don't clobber it with the identity mapping. When running with this |
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* stack, any references to the current task *will not work* so you |
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* should really do as little as possible before jumping to your reset |
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* code. |
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*/ |
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static u64 soft_restart_stack[16]; |
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static void __soft_restart(void *addr) |
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{ |
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phys_reset_t phys_reset; |
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/* Take out a flat memory mapping. */ |
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setup_mm_for_reboot(); |
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/* Clean and invalidate caches */ |
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flush_cache_all(); |
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/* Turn off caching */ |
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cpu_proc_fin(); |
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/* Push out any further dirty data, and ensure cache is empty */ |
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flush_cache_all(); |
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/* Switch to the identity mapping. */ |
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phys_reset = (phys_reset_t)virt_to_idmap(cpu_reset); |
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/* original stub should be restored by kvm */ |
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phys_reset((unsigned long)addr, is_hyp_mode_available()); |
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/* Should never get here. */ |
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BUG(); |
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} |
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void _soft_restart(unsigned long addr, bool disable_l2) |
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{ |
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u64 *stack = soft_restart_stack + ARRAY_SIZE(soft_restart_stack); |
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/* Disable interrupts first */ |
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raw_local_irq_disable(); |
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local_fiq_disable(); |
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/* Disable the L2 if we're the last man standing. */ |
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if (disable_l2) |
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outer_disable(); |
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/* Change to the new stack and continue with the reset. */ |
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call_with_stack(__soft_restart, (void *)addr, (void *)stack); |
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/* Should never get here. */ |
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BUG(); |
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} |
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void soft_restart(unsigned long addr) |
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{ |
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_soft_restart(addr, num_online_cpus() == 1); |
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} |
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/* |
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* Called by kexec, immediately prior to machine_kexec(). |
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* |
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* This must completely disable all secondary CPUs; simply causing those CPUs |
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* to execute e.g. a RAM-based pin loop is not sufficient. This allows the |
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* kexec'd kernel to use any and all RAM as it sees fit, without having to |
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* avoid any code or data used by any SW CPU pin loop. The CPU hotplug |
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* functionality embodied in smp_shutdown_nonboot_cpus() to achieve this. |
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*/ |
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void machine_shutdown(void) |
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{ |
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smp_shutdown_nonboot_cpus(reboot_cpu); |
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} |
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/* |
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* Halting simply requires that the secondary CPUs stop performing any |
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* activity (executing tasks, handling interrupts). smp_send_stop() |
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* achieves this. |
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*/ |
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void machine_halt(void) |
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{ |
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machine_power_off(); |
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} |
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/* |
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* Power-off simply requires that the secondary CPUs stop performing any |
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* activity (executing tasks, handling interrupts). smp_send_stop() |
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* achieves this. When the system power is turned off, it will take all CPUs |
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* with it. |
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*/ |
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void machine_power_off(void) |
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{ |
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local_irq_disable(); |
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smp_send_stop(); |
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if (pm_power_off) |
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pm_power_off(); |
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} |
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/* |
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* Restart requires that the secondary CPUs stop performing any activity |
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* while the primary CPU resets the system. Systems with a single CPU can |
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* use soft_restart() as their machine descriptor's .restart hook, since that |
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* will cause the only available CPU to reset. Systems with multiple CPUs must |
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* provide a HW restart implementation, to ensure that all CPUs reset at once. |
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* This is required so that any code running after reset on the primary CPU |
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* doesn't have to co-ordinate with other CPUs to ensure they aren't still |
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* executing pre-reset code, and using RAM that the primary CPU's code wishes |
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* to use. Implementing such co-ordination would be essentially impossible. |
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*/ |
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void machine_restart(char *cmd) |
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{ |
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local_irq_disable(); |
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smp_send_stop(); |
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if (arm_pm_restart) |
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arm_pm_restart(reboot_mode, cmd); |
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else |
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do_kernel_restart(cmd); |
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/* Give a grace period for failure to restart of 1s */ |
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mdelay(1000); |
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/* Whoops - the platform was unable to reboot. Tell the user! */ |
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printk("Reboot failed -- System halted\n"); |
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while (1); |
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}
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