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)
42 ENTRY(swsusp_arch_resume)
44 leaq init_level4_pgt(%rip),%rax
45 subq $__START_KERNEL_map,%rax
48 movq mmu_cr4_features(%rip), %rax
50 andq $~(1<<7), %rdx # PGE
51 movq %rdx, %cr4; # turn off PGE
52 movq %cr3, %rcx; # flush TLB
54 movq %rax, %cr4; # turn PGE back on
56 movq pagedir_nosave(%rip), %rdx
61 /* get addresses from the pbe and copy the page */
62 movq pbe_address(%rdx), %rsi
63 movq pbe_orig_address(%rdx), %rdi
68 /* progress to the next pbe */
69 movq pbe_next(%rdx), %rdx
72 /* Flush TLB, including "global" things (vmalloc) */
73 movq mmu_cr4_features(%rip), %rax
75 andq $~(1<<7), %rdx; # PGE
76 movq %rdx, %cr4; # turn off PGE
77 movq %cr3, %rcx; # flush TLB
79 movq %rax, %cr4; # turn PGE back on
84 movq saved_context_esp(%rip), %rsp
85 movq saved_context_ebp(%rip), %rbp
86 /* Don't restore %rax, it must be 0 anyway */
87 movq saved_context_ebx(%rip), %rbx
88 movq saved_context_ecx(%rip), %rcx
89 movq saved_context_edx(%rip), %rdx
90 movq saved_context_esi(%rip), %rsi
91 movq saved_context_edi(%rip), %rdi
92 movq saved_context_r08(%rip), %r8
93 movq saved_context_r09(%rip), %r9
94 movq saved_context_r10(%rip), %r10
95 movq saved_context_r11(%rip), %r11
96 movq saved_context_r12(%rip), %r12
97 movq saved_context_r13(%rip), %r13
98 movq saved_context_r14(%rip), %r14
99 movq saved_context_r15(%rip), %r15
100 pushq saved_context_eflags(%rip) ; popfq