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Diffstat (limited to 'target/linux/olpc/files/arch/i386/kernel/olpc-wakeup.S')
-rw-r--r--target/linux/olpc/files/arch/i386/kernel/olpc-wakeup.S122
1 files changed, 122 insertions, 0 deletions
diff --git a/target/linux/olpc/files/arch/i386/kernel/olpc-wakeup.S b/target/linux/olpc/files/arch/i386/kernel/olpc-wakeup.S
new file mode 100644
index 0000000000..a92cc61e24
--- /dev/null
+++ b/target/linux/olpc/files/arch/i386/kernel/olpc-wakeup.S
@@ -0,0 +1,122 @@
+.text
+#include <linux/linkage.h>
+#include <asm/segment.h>
+#include <asm/page.h>
+
+ALIGN
+ .align 4096
+
+wakeup_start:
+# jmp wakeup_start
+
+ cli
+ cld
+
+ # Clear any dangerous flags
+
+ pushl $0
+ popfl
+
+ # Set up %cr3
+ movl $swsusp_pg_dir - __PAGE_OFFSET, %eax
+ movl %eax, %cr3
+
+ movl saved_cr4, %eax
+ movl %eax, %cr4
+
+ movl saved_cr0, %eax
+ movl %eax, %cr0
+
+ jmp 1f
+1:
+ ljmpl $__KERNEL_CS,$wakeup_return
+
+
+.org 0x1000
+
+wakeup_return:
+ movw $__KERNEL_DS, %ax
+ movw %ax, %ss
+ movw %ax, %ds
+ movw %ax, %es
+ movw %ax, %fs
+ movw %ax, %gs
+
+ lgdt saved_gdt
+ lidt saved_idt
+ lldt saved_ldt
+ ljmp $(__KERNEL_CS),$1f
+1:
+ movl %cr3, %eax
+ movl %eax, %cr3
+ wbinvd
+
+ # Go back to the return point
+ jmp ret_point
+
+save_registers:
+ sgdt saved_gdt
+ sidt saved_idt
+ sldt saved_ldt
+
+ pushl %edx
+ movl %cr4, %edx
+ movl %edx, saved_cr4
+
+ movl %cr0, %edx
+ movl %edx, saved_cr0
+
+ popl %edx
+
+
+ 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
+
+ ret
+
+
+restore_registers:
+ 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
+
+ ret
+
+
+ENTRY(do_olpc_suspend_lowlevel)
+ call save_processor_state
+ call save_registers
+
+ # This is the stack context we want to remember
+ movl %esp, saved_context_esp
+
+ pushl $3
+ call olpc_do_sleep
+
+ jmp wakeup_start
+ .p2align 4,,7
+ret_point:
+ movl saved_context_esp, %esp
+
+ call restore_registers
+ call restore_processor_state
+ ret
+
+.data
+ALIGN
+
+saved_gdt: .long 0,0
+saved_idt: .long 0,0
+saved_ldt: .long 0
+saved_cr4: .long 0
+saved_cr0: .long 0
+