1 /* Copyright 2004,2005 Pavel Machek <pavel@suse.cz>, Andi Kleen <ak@suse.de>, Rafael J. Wysocki <rjw@sisk.pl>
3 * Distribute under GPLv2.
5 * swsusp_arch_resume must not use any stack or any nonlocal variables while
8 * Its rewriting one kernel image with another. What is stack in "old"
9 * image could very well be data page in "new" image, and overwriting
10 * your own stack under you is bad idea.
14 #include <linux/linkage.h>
15 #include <asm/segment.h>
17 #include <asm/asm-offsets.h>
19 ENTRY(swsusp_arch_suspend)
21 movq %rsp, saved_context_esp(%rip)
22 movq %rax, saved_context_eax(%rip)
23 movq %rbx, saved_context_ebx(%rip)
24 movq %rcx, saved_context_ecx(%rip)
25 movq %rdx, saved_context_edx(%rip)
26 movq %rbp, saved_context_ebp(%rip)
27 movq %rsi, saved_context_esi(%rip)
28 movq %rdi, saved_context_edi(%rip)
29 movq %r8, saved_context_r08(%rip)
30 movq %r9, saved_context_r09(%rip)
31 movq %r10, saved_context_r10(%rip)
32 movq %r11, saved_context_r11(%rip)
33 movq %r12, saved_context_r12(%rip)
34 movq %r13, saved_context_r13(%rip)
35 movq %r14, saved_context_r14(%rip)
36 movq %r15, saved_context_r15(%rip)
37 pushfq ; popq saved_context_eflags(%rip)
39 /* save the address of restore_registers */
40 movq $restore_registers, %rax
41 movq %rax, restore_jump_address(%rip)
47 /* switch to temporary page tables */
48 movq $__PAGE_OFFSET, %rdx
49 movq temp_level4_pgt(%rip), %rax
53 movq mmu_cr4_features(%rip), %rax
55 andq $~(1<<7), %rdx # PGE
56 movq %rdx, %cr4; # turn off PGE
57 movq %cr3, %rcx; # flush TLB
59 movq %rax, %cr4; # turn PGE back on
61 /* prepare to jump to the image kernel */
62 movq restore_jump_address(%rip), %rax
64 /* prepare to copy image data to their original locations */
65 movq restore_pblist(%rip), %rdx
66 movq relocated_restore_code(%rip), %rcx
69 /* code below has been relocated to a safe page */
70 ENTRY(core_restore_code)
75 /* get addresses from the pbe and copy the page */
76 movq pbe_address(%rdx), %rsi
77 movq pbe_orig_address(%rdx), %rdi
78 movq $(PAGE_SIZE >> 3), %rcx
82 /* progress to the next pbe */
83 movq pbe_next(%rdx), %rdx
86 /* jump to the restore_registers address from the image header */
89 * NOTE: This assumes that the boot kernel's text mapping covers the
90 * image kernel's page containing restore_registers and the address of
91 * this page is the same as in the image kernel's text mapping (it
92 * should always be true, because the text mapping is linear, starting
93 * from 0, and is supposed to cover the entire kernel text for every
96 * code below belongs to the image kernel
99 ENTRY(restore_registers)
100 /* go back to the original page tables */
101 movq $(init_level4_pgt - __START_KERNEL_map), %rax
102 addq phys_base(%rip), %rax
105 /* Flush TLB, including "global" things (vmalloc) */
106 movq mmu_cr4_features(%rip), %rax
108 andq $~(1<<7), %rdx; # PGE
109 movq %rdx, %cr4; # turn off PGE
110 movq %cr3, %rcx; # flush TLB
112 movq %rax, %cr4; # turn PGE back on
114 movq saved_context_esp(%rip), %rsp
115 movq saved_context_ebp(%rip), %rbp
116 /* restore GPRs (we don't restore %rax, it must be 0 anyway) */
117 movq saved_context_ebx(%rip), %rbx
118 movq saved_context_ecx(%rip), %rcx
119 movq saved_context_edx(%rip), %rdx
120 movq saved_context_esi(%rip), %rsi
121 movq saved_context_edi(%rip), %rdi
122 movq saved_context_r08(%rip), %r8
123 movq saved_context_r09(%rip), %r9
124 movq saved_context_r10(%rip), %r10
125 movq saved_context_r11(%rip), %r11
126 movq saved_context_r12(%rip), %r12
127 movq saved_context_r13(%rip), %r13
128 movq saved_context_r14(%rip), %r14
129 movq saved_context_r15(%rip), %r15
130 pushq saved_context_eflags(%rip) ; popfq
134 /* tell the hibernation core that we've just restored the memory */
135 movq %rax, in_suspend(%rip)