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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/x86_64/kernel/suspend_asm.S
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/x86_64/kernel/suspend_asm.S')
-rw-r--r--arch/x86_64/kernel/suspend_asm.S104
1 files changed, 104 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/suspend_asm.S b/arch/x86_64/kernel/suspend_asm.S
new file mode 100644
index 00000000000..53f8e165951
--- /dev/null
+++ b/arch/x86_64/kernel/suspend_asm.S
@@ -0,0 +1,104 @@
+/* Copyright 2004,2005 Pavel Machek <pavel@suse.cz>, Andi Kleen <ak@suse.de>, Rafael J. Wysocki <rjw@sisk.pl>
+ *
+ * Distribute under GPLv2.
+ *
+ * swsusp_arch_resume may not use any stack, nor any variable that is
+ * not "NoSave" during copying pages:
+ *
+ * Its rewriting one kernel image with another. What is stack in "old"
+ * image could very well be data page in "new" image, and overwriting
+ * your own stack under you is bad idea.
+ */
+
+ .text
+#include <linux/linkage.h>
+#include <asm/segment.h>
+#include <asm/page.h>
+#include <asm/offset.h>
+
+ENTRY(swsusp_arch_suspend)
+
+ movq %rsp, saved_context_esp(%rip)
+ movq %rax, saved_context_eax(%rip)
+ movq %rbx, saved_context_ebx(%rip)
+ movq %rcx, saved_context_ecx(%rip)
+ movq %rdx, saved_context_edx(%rip)
+ movq %rbp, saved_context_ebp(%rip)
+ movq %rsi, saved_context_esi(%rip)
+ movq %rdi, saved_context_edi(%rip)
+ movq %r8, saved_context_r08(%rip)
+ movq %r9, saved_context_r09(%rip)
+ movq %r10, saved_context_r10(%rip)
+ movq %r11, saved_context_r11(%rip)
+ movq %r12, saved_context_r12(%rip)
+ movq %r13, saved_context_r13(%rip)
+ movq %r14, saved_context_r14(%rip)
+ movq %r15, saved_context_r15(%rip)
+ pushfq ; popq saved_context_eflags(%rip)
+
+ call swsusp_save
+ ret
+
+ENTRY(swsusp_arch_resume)
+ /* set up cr3 */
+ leaq init_level4_pgt(%rip),%rax
+ subq $__START_KERNEL_map,%rax
+ movq %rax,%cr3
+
+ movq mmu_cr4_features(%rip), %rax
+ movq %rax, %rdx
+ andq $~(1<<7), %rdx # PGE
+ movq %rdx, %cr4; # turn off PGE
+ movq %cr3, %rcx; # flush TLB
+ movq %rcx, %cr3;
+ movq %rax, %cr4; # turn PGE back on
+
+ movq pagedir_nosave(%rip), %rdx
+loop:
+ testq %rdx, %rdx
+ jz done
+
+ /* get addresses from the pbe and copy the page */
+ movq pbe_address(%rdx), %rsi
+ movq pbe_orig_address(%rdx), %rdi
+ movq $512, %rcx
+ rep
+ movsq
+
+ /* progress to the next pbe */
+ movq pbe_next(%rdx), %rdx
+ jmp loop
+done:
+ /* Flush TLB, including "global" things (vmalloc) */
+ movq mmu_cr4_features(%rip), %rax
+ movq %rax, %rdx
+ andq $~(1<<7), %rdx; # PGE
+ movq %rdx, %cr4; # turn off PGE
+ movq %cr3, %rcx; # flush TLB
+ movq %rcx, %cr3
+ movq %rax, %cr4; # turn PGE back on
+
+ movl $24, %eax
+ movl %eax, %ds
+
+ movq saved_context_esp(%rip), %rsp
+ movq saved_context_ebp(%rip), %rbp
+ /* Don't restore %rax, it must be 0 anyway */
+ movq saved_context_ebx(%rip), %rbx
+ movq saved_context_ecx(%rip), %rcx
+ movq saved_context_edx(%rip), %rdx
+ movq saved_context_esi(%rip), %rsi
+ movq saved_context_edi(%rip), %rdi
+ movq saved_context_r08(%rip), %r8
+ movq saved_context_r09(%rip), %r9
+ movq saved_context_r10(%rip), %r10
+ movq saved_context_r11(%rip), %r11
+ movq saved_context_r12(%rip), %r12
+ movq saved_context_r13(%rip), %r13
+ movq saved_context_r14(%rip), %r14
+ movq saved_context_r15(%rip), %r15
+ pushq saved_context_eflags(%rip) ; popfq
+
+ xorq %rax, %rax
+
+ ret