Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / x86 / power / hibernate_asm_32.S

diff --git a/kernel/arch/x86/power/hibernate_asm_32.S b/kernel/arch/x86/power/hibernate_asm_32.S
new file mode 100644 (file)
index 0000000..1d0fa0e
--- /dev/null
+++ b/kernel/arch/x86/power/hibernate_asm_32.S
@@ -0,0 +1,84 @@
+/*
+ * 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_types.h>
+#include <asm/asm-offsets.h>
+#include <asm/processor-flags.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    mmu_cr4_features, %ecx
+       movl    resume_pg_dir, %eax
+       subl    $__PAGE_OFFSET, %eax
+       movl    %eax, %cr3
+
+       jecxz   1f      # cr4 Pentium and higher, skip if zero
+       andl    $~(X86_CR4_PGE), %ecx
+       movl    %ecx, %cr4;  # turn off PGE
+       movl    %cr3, %eax;  # flush TLB
+       movl    %eax, %cr3
+1:
+       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, %eax
+       subl    $__PAGE_OFFSET, %eax
+       movl    %eax, %cr3
+       movl    mmu_cr4_features, %ecx
+       jecxz   1f      # cr4 Pentium and higher, skip if zero
+       movl    %ecx, %cr4;  # turn PGE back on
+1:
+
+       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
+
+       /* Saved in save_processor_state. */
+       movl $saved_context, %eax
+       lgdt saved_context_gdt_desc(%eax)
+
+       xorl    %eax, %eax
+
+       ret