arch: i386: move jump_userspace to its own file

Move the function that jumps to ring 3 to its own assembly file.

Signed-off-by: Danny Holman <dholman@gymli.org>

1 files changed, 29 insertions, 0 deletions

diff --git a/arch/i386/kernel/jump_userspace.s b/arch/i386/kernel/jump_userspace.s
new file mode 100644
index 0000000..fe69880
--- /dev/null
+++ b/arch/i386/kernel/jump_userspace.s
@@ -0,0 +1,29 @@
+.global jump_userspace
+.type jump_userspace, @function
+jump_userspace:
+        movw $0x23, %ax
+        movw %ax, %ds
+        movw %ax, %es
+        movw %ax, %fs
+        movw %ax, %gs
+
+        movl %esp, %eax
+        pushl $0x23
+        pushl %eax
+        pushf
+        push $0x1B
+        pushl $start_init
+
+        pushl %esp
+        call set_kernel_esp
+        addl $4, %esp
+
+        movl $0x0004, %eax
+        orl $0x0002, %eax
+        pushl %eax
+        call init_page_dir
+        addl $4, %esp
+
+        movl %eax, %cr3
+
+        iret