From 5d06824289868c5a345fbcfa8ed4d1e63af84fdb Mon Sep 17 00:00:00 2001
From: Danny Holman <dholman@gymli.org>
Date: Sat, 24 Feb 2024 06:41:48 -0600
Subject: 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>
---
 arch/i386/boot/boot.s             | 19 +------------------
 arch/i386/kernel/jump_userspace.s | 29 +++++++++++++++++++++++++++++
 2 files changed, 30 insertions(+), 18 deletions(-)
 create mode 100644 arch/i386/kernel/jump_userspace.s

(limited to 'arch/i386')

diff --git a/arch/i386/boot/boot.s b/arch/i386/boot/boot.s
index 005b07b..4b9106d 100644
--- a/arch/i386/boot/boot.s
+++ b/arch/i386/boot/boot.s
@@ -82,7 +82,7 @@ load_page_dir:
         pushl %ebp
         movl %esp, %ebp
 
-        movl 8(%ebp), %eax
+        movl 8(%esp), %eax
         movl %eax, %cr3
 
         movl %ebp, %esp
@@ -111,20 +111,3 @@ flush_gdt:
         jmp $0x08, $.flush
 .flush:
         ret
-
-.global jump_userspace
-.type jump_userspace, @function
-jump_userspace:
-        movw $0x23, %ax
-        movw %ax, %ds
-        movw %ax, %es
-        movw %ax, %fs
-        movw %ax, %gs
-
-        pushl $0x23
-        pushl %esp
-        pushf
-        orl $0x200, (%esp)
-        pushl $0x1B
-        pushl test_user_function
-        iret
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
-- 
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