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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - arch/arm/kernel/hibernate.c
2 * Hibernation support specific for ARM
4 * Derived from work on ARM hibernation support by:
6 * Ubuntu project, hibernation support for mach-dove
7 * Copyright (C) 2010 Nokia Corporation (Hiroshi Doyu)
8 * Copyright (C) 2010 Texas Instruments, Inc. (Teerth Reddy et al.)
9 * https://lkml.org/lkml/2010/6/18/4
10 * https://lists.linux-foundation.org/pipermail/linux-pm/2010-June/027422.html
11 * https://patchwork.kernel.org/patch/96442/
13 * Copyright (C) 2006 Rafael J. Wysocki <rjw@sisk.pl>
15 * License terms: GNU General Public License (GPL) version 2
19 #include <linux/suspend.h>
20 #include <asm/system_misc.h>
21 #include <asm/idmap.h>
22 #include <asm/suspend.h>
23 #include <asm/memory.h>
24 #include <asm/sections.h>
27 int pfn_is_nosave(unsigned long pfn
)
29 unsigned long nosave_begin_pfn
= virt_to_pfn(&__nosave_begin
);
30 unsigned long nosave_end_pfn
= virt_to_pfn(&__nosave_end
- 1);
32 return (pfn
>= nosave_begin_pfn
) && (pfn
<= nosave_end_pfn
);
35 void notrace
save_processor_state(void)
37 WARN_ON(num_online_cpus() != 1);
41 void notrace
restore_processor_state(void)
47 * Snapshot kernel memory and reset the system.
49 * swsusp_save() is executed in the suspend finisher so that the CPU
50 * context pointer and memory are part of the saved image, which is
51 * required by the resume kernel image to restart execution from
52 * swsusp_arch_suspend().
54 * soft_restart is not technically needed, but is used to get success
55 * returned from cpu_suspend.
57 * When soft reboot completes, the hibernation snapshot is written out.
59 static int notrace
arch_save_image(unsigned long unused
)
65 _soft_restart(virt_to_phys(cpu_resume
), false);
70 * Save the current CPU state before suspend / poweroff.
72 int notrace
swsusp_arch_suspend(void)
74 return cpu_suspend(0, arch_save_image
);
78 * Restore page contents for physical pages that were in use during loading
79 * hibernation image. Switch to idmap_pgd so the physical page tables
80 * are overwritten with the same contents.
82 static void notrace
arch_restore_image(void *unused
)
86 cpu_switch_mm(idmap_pgd
, &init_mm
);
87 for (pbe
= restore_pblist
; pbe
; pbe
= pbe
->next
)
88 copy_page(pbe
->orig_address
, pbe
->address
);
90 _soft_restart(virt_to_phys(cpu_resume
), false);
93 static u64 resume_stack
[PAGE_SIZE
/2/sizeof(u64
)] __nosavedata
;
96 * Resume from the hibernation image.
97 * Due to the kernel heap / data restore, stack contents change underneath
98 * and that would make function calls impossible; switch to a temporary
99 * stack within the nosave region to avoid that problem.
101 int swsusp_arch_resume(void)
103 call_with_stack(arch_restore_image
, 0,
104 resume_stack
+ ARRAY_SIZE(resume_stack
));