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)
20 movq $saved_context, %rax
21 movq %rsp, pt_regs_sp(%rax)
22 movq %rbp, pt_regs_bp(%rax)
23 movq %rsi, pt_regs_si(%rax)
24 movq %rdi, pt_regs_di(%rax)
25 movq %rbx, pt_regs_bx(%rax)
26 movq %rcx, pt_regs_cx(%rax)
27 movq %rdx, pt_regs_dx(%rax)
28 movq %r8, pt_regs_r8(%rax)
29 movq %r9, pt_regs_r9(%rax)
30 movq %r10, pt_regs_r10(%rax)
31 movq %r11, pt_regs_r11(%rax)
32 movq %r12, pt_regs_r12(%rax)
33 movq %r13, pt_regs_r13(%rax)
34 movq %r14, pt_regs_r14(%rax)
35 movq %r15, pt_regs_r15(%rax)
37 popq pt_regs_flags(%rax)
39 /* save the address of restore_registers */
40 movq $restore_registers, %rax
41 movq %rax, restore_jump_address(%rip)
44 movq %rax, restore_cr3(%rip)
50 /* switch to temporary page tables */
51 movq $__PAGE_OFFSET, %rdx
52 movq temp_level4_pgt(%rip), %rax
56 movq mmu_cr4_features(%rip), %rax
58 andq $~(1<<7), %rdx # PGE
59 movq %rdx, %cr4; # turn off PGE
60 movq %cr3, %rcx; # flush TLB
62 movq %rax, %cr4; # turn PGE back on
64 /* prepare to jump to the image kernel */
65 movq restore_jump_address(%rip), %rax
66 movq restore_cr3(%rip), %rbx
68 /* prepare to copy image data to their original locations */
69 movq restore_pblist(%rip), %rdx
70 movq relocated_restore_code(%rip), %rcx
73 /* code below has been relocated to a safe page */
74 ENTRY(core_restore_code)
79 /* get addresses from the pbe and copy the page */
80 movq pbe_address(%rdx), %rsi
81 movq pbe_orig_address(%rdx), %rdi
82 movq $(PAGE_SIZE >> 3), %rcx
86 /* progress to the next pbe */
87 movq pbe_next(%rdx), %rdx
90 /* jump to the restore_registers address from the image header */
93 * NOTE: This assumes that the boot kernel's text mapping covers the
94 * image kernel's page containing restore_registers and the address of
95 * this page is the same as in the image kernel's text mapping (it
96 * should always be true, because the text mapping is linear, starting
97 * from 0, and is supposed to cover the entire kernel text for every
100 * code below belongs to the image kernel
103 ENTRY(restore_registers)
104 /* go back to the original page tables */
107 /* Flush TLB, including "global" things (vmalloc) */
108 movq mmu_cr4_features(%rip), %rax
110 andq $~(1<<7), %rdx; # PGE
111 movq %rdx, %cr4; # turn off PGE
112 movq %cr3, %rcx; # flush TLB
114 movq %rax, %cr4; # turn PGE back on
116 /* We don't restore %rax, it must be 0 anyway */
117 movq $saved_context, %rax
118 movq pt_regs_sp(%rax), %rsp
119 movq pt_regs_bp(%rax), %rbp
120 movq pt_regs_si(%rax), %rsi
121 movq pt_regs_di(%rax), %rdi
122 movq pt_regs_bx(%rax), %rbx
123 movq pt_regs_cx(%rax), %rcx
124 movq pt_regs_dx(%rax), %rdx
125 movq pt_regs_r8(%rax), %r8
126 movq pt_regs_r9(%rax), %r9
127 movq pt_regs_r10(%rax), %r10
128 movq pt_regs_r11(%rax), %r11
129 movq pt_regs_r12(%rax), %r12
130 movq pt_regs_r13(%rax), %r13
131 movq pt_regs_r14(%rax), %r14
132 movq pt_regs_r15(%rax), %r15
133 pushq pt_regs_flags(%rax)
138 /* tell the hibernation core that we've just restored the memory */
139 movq %rax, in_suspend(%rip)