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105 lines
2.8 KiB
105 lines
2.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Hibernation support specific for ARM |
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* |
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* Derived from work on ARM hibernation support by: |
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* |
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* Ubuntu project, hibernation support for mach-dove |
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* Copyright (C) 2010 Nokia Corporation (Hiroshi Doyu) |
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* Copyright (C) 2010 Texas Instruments, Inc. (Teerth Reddy et al.) |
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* https://lkml.org/lkml/2010/6/18/4 |
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* https://lists.linux-foundation.org/pipermail/linux-pm/2010-June/027422.html |
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* https://patchwork.kernel.org/patch/96442/ |
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* |
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* Copyright (C) 2006 Rafael J. Wysocki <[email protected]> |
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*/ |
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#include <linux/mm.h> |
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#include <linux/suspend.h> |
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#include <asm/system_misc.h> |
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#include <asm/idmap.h> |
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#include <asm/suspend.h> |
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#include <asm/memory.h> |
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#include <asm/sections.h> |
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#include "reboot.h" |
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int pfn_is_nosave(unsigned long pfn) |
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{ |
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unsigned long nosave_begin_pfn = virt_to_pfn(&__nosave_begin); |
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unsigned long nosave_end_pfn = virt_to_pfn(&__nosave_end - 1); |
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return (pfn >= nosave_begin_pfn) && (pfn <= nosave_end_pfn); |
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} |
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void notrace save_processor_state(void) |
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{ |
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WARN_ON(num_online_cpus() != 1); |
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local_fiq_disable(); |
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} |
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void notrace restore_processor_state(void) |
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{ |
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local_fiq_enable(); |
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} |
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/* |
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* Snapshot kernel memory and reset the system. |
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* |
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* swsusp_save() is executed in the suspend finisher so that the CPU |
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* context pointer and memory are part of the saved image, which is |
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* required by the resume kernel image to restart execution from |
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* swsusp_arch_suspend(). |
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* |
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* soft_restart is not technically needed, but is used to get success |
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* returned from cpu_suspend. |
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* |
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* When soft reboot completes, the hibernation snapshot is written out. |
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*/ |
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static int notrace arch_save_image(unsigned long unused) |
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{ |
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int ret; |
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ret = swsusp_save(); |
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if (ret == 0) |
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_soft_restart(virt_to_idmap(cpu_resume), false); |
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return ret; |
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} |
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/* |
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* Save the current CPU state before suspend / poweroff. |
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*/ |
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int notrace swsusp_arch_suspend(void) |
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{ |
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return cpu_suspend(0, arch_save_image); |
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} |
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/* |
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* Restore page contents for physical pages that were in use during loading |
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* hibernation image. Switch to idmap_pgd so the physical page tables |
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* are overwritten with the same contents. |
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*/ |
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static void notrace arch_restore_image(void *unused) |
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{ |
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struct pbe *pbe; |
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cpu_switch_mm(idmap_pgd, &init_mm); |
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for (pbe = restore_pblist; pbe; pbe = pbe->next) |
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copy_page(pbe->orig_address, pbe->address); |
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_soft_restart(virt_to_idmap(cpu_resume), false); |
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} |
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static u64 resume_stack[PAGE_SIZE/2/sizeof(u64)] __nosavedata; |
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/* |
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* Resume from the hibernation image. |
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* Due to the kernel heap / data restore, stack contents change underneath |
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* and that would make function calls impossible; switch to a temporary |
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* stack within the nosave region to avoid that problem. |
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*/ |
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int swsusp_arch_resume(void) |
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{ |
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call_with_stack(arch_restore_image, 0, |
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resume_stack + ARRAY_SIZE(resume_stack)); |
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return 0; |
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}
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