From a99ca43066ba246475809a0e805bf52e8195debd Mon Sep 17 00:00:00 2001
From: Michal Idziorek <m.i@gmx.at>
Date: Tue, 24 Jun 2014 13:53:31 +0200
Subject: Initial commit of FoolOS

FoolOS - the most useless OS in history.
---
 boot/pm.asm | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 boot/pm.asm

(limited to 'boot/pm.asm')

diff --git a/boot/pm.asm b/boot/pm.asm
new file mode 100644
index 0000000..c66ab4f
--- /dev/null
+++ b/boot/pm.asm
@@ -0,0 +1,27 @@
+[bits 16]
+switch_to_pm:
+
+    cli				;switch off interrupts!
+    lgdt [gdt_descriptor]	;load descriptor table!
+
+    ;switch on 32-bit protected mode
+    mov eax, cr0
+    or eax,0x1 
+    mov cr0, eax
+
+    jmp CODE_SEG:init_pm
+
+[bits 32]
+init_pm:
+
+    mov ax, DATA_SEG
+    mov ds, ax
+    mov ss, ax
+    mov es, ax
+    mov fs, ax
+    mov gs, ax
+
+    mov ebp, 0x90000
+    mov esp, ebp
+
+    call boot_32_pm	    ;continue booting in 32-bit protected mode
-- 
cgit v1.2.3