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 may not use any stack, nor any variable that is
6 * not "NoSave" during copying pages:
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)
43 /* switch to temporary page tables */
44 movq $__PAGE_OFFSET, %rdx
45 movq temp_level4_pgt(%rip), %rax
49 movq mmu_cr4_features(%rip), %rax
51 andq $~(1<<7), %rdx # PGE
52 movq %rdx, %cr4; # turn off PGE
53 movq %cr3, %rcx; # flush TLB
55 movq %rax, %cr4; # turn PGE back on
57 movq pagedir_nosave(%rip), %rdx
62 /* get addresses from the pbe and copy the page */
63 movq pbe_address(%rdx), %rsi
64 movq pbe_orig_address(%rdx), %rdi
69 /* progress to the next pbe */
70 movq pbe_next(%rdx), %rdx
73 /* go back to the original page tables */
74 leaq init_level4_pgt(%rip), %rax
75 subq $__START_KERNEL_map, %rax
77 /* Flush TLB, including "global" things (vmalloc) */
78 movq mmu_cr4_features(%rip), %rax
80 andq $~(1<<7), %rdx; # PGE
81 movq %rdx, %cr4; # turn off PGE
82 movq %cr3, %rcx; # flush TLB
84 movq %rax, %cr4; # turn PGE back on
89 movq saved_context_esp(%rip), %rsp
90 movq saved_context_ebp(%rip), %rbp
91 /* Don't restore %rax, it must be 0 anyway */
92 movq saved_context_ebx(%rip), %rbx
93 movq saved_context_ecx(%rip), %rcx
94 movq saved_context_edx(%rip), %rdx
95 movq saved_context_esi(%rip), %rsi
96 movq saved_context_edi(%rip), %rdi
97 movq saved_context_r08(%rip), %r8
98 movq saved_context_r09(%rip), %r9
99 movq saved_context_r10(%rip), %r10
100 movq saved_context_r11(%rip), %r11
101 movq saved_context_r12(%rip), %r12
102 movq saved_context_r13(%rip), %r13
103 movq saved_context_r14(%rip), %r14
104 movq saved_context_r15(%rip), %r15
105 pushq saved_context_eflags(%rip) ; popfq