1 files changed, 77 insertions, 0 deletions

diff --git a/arch/x86/power/hibernate_asm_32.S b/arch/x86/power/hibernate_asm_32.S
new file mode 100644
index 000000000000..b95aa6cfe3cb
--- /dev/null
+++ b/arch/x86/power/hibernate_asm_32.S
@@ -0,0 +1,77 @@
+.text
+
+/*
+ * This may not use any stack, nor any variable that is not "NoSave":
+ *
+ * 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.
+ */
+
+#include <linux/linkage.h>
+#include <asm/segment.h>
+#include <asm/page.h>
+#include <asm/asm-offsets.h>
+
+        .text
+
+ENTRY(swsusp_arch_suspend)
+
+        movl %esp, saved_context_esp
+        movl %ebx, saved_context_ebx
+        movl %ebp, saved_context_ebp
+        movl %esi, saved_context_esi
+        movl %edi, saved_context_edi
+        pushfl ; popl saved_context_eflags
+
+        call swsusp_save
+        ret
+
+ENTRY(restore_image)
+        movl    resume_pg_dir, %ecx
+        subl    $__PAGE_OFFSET, %ecx
+        movl    %ecx, %cr3
+
+        movl    restore_pblist, %edx
+        .p2align 4,,7
+
+copy_loop:
+        testl   %edx, %edx
+        jz      done
+
+        movl    pbe_address(%edx), %esi
+        movl    pbe_orig_address(%edx), %edi
+
+        movl    $1024, %ecx
+        rep
+        movsl
+
+        movl    pbe_next(%edx), %edx
+        jmp     copy_loop
+        .p2align 4,,7
+
+done:
+        /* go back to the original page tables */
+        movl    $swapper_pg_dir, %ecx
+        subl    $__PAGE_OFFSET, %ecx
+        movl    %ecx, %cr3
+        /* Flush TLB, including "global" things (vmalloc) */
+        movl    mmu_cr4_features, %eax
+        movl    %eax, %edx
+        andl    $~(1<<7), %edx;  # PGE
+        movl    %edx, %cr4;  # turn off PGE
+        movl    %cr3, %ecx;  # flush TLB
+        movl    %ecx, %cr3
+        movl    %eax, %cr4;  # turn PGE back on
+
+        movl saved_context_esp, %esp
+        movl saved_context_ebp, %ebp
+        movl saved_context_ebx, %ebx
+        movl saved_context_esi, %esi
+        movl saved_context_edi, %edi
+
+        pushl saved_context_eflags ; popfl
+
+        xorl    %eax, %eax
+
+        ret