switch video mode hack by dropping to real mode to call the video bios works!

[bootcensus] / src / vbioshack.s

diff --git a/src/vbioshack.s b/src/vbioshack.s
deleted file mode 100644 (file)
index 66ffa78..0000000
--- a/src/vbioshack.s
+++ /dev/null
@@ -1,67 +0,0 @@
-# pcboot - bootable PC demo/game kernel
-# Copyright (C) 2018  John Tsiombikas <nuclear@member.fsf.org>
-# 
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-# 
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY, without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-# 
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-       .text
-
-       .align 4
-       .short 0
-saved_idtr:
-idtlim:        .short 0
-idtaddr:.long 0
-
-       .short 0
-saved_gdtr:
-gdtlim:        .short 0
-gdtaddr:.long 0
-
-       .short 0
-rmidt: .short 0x3ff
-       .long 0
-
-       # drop back to real mode to set video mode hack
-       .global set_mode13h
-set_mode13h:
-       cli
-       #sgdt (saved_gdtr)
-       sidt (saved_idtr)
-       lidt (rmidt)
-
-       mov %cr0, %eax
-       and $0xfffe, %ax
-       mov %eax, %cr0
-       jmp 0f
-
-0:     xor %ax, %ax
-       mov %ax, %ds
-       mov %ax, %es
-       mov %ax, %ss
-
-       #mov $0x13, %ax
-       #int $0x10
-
-       mov %cr0, %eax
-       or $1, %ax
-       mov %eax, %cr0
-       jmp 0f
-
-0:     mov $0x10, %ax
-       mov %ax, %ds
-       mov %ax, %es
-       mov %ax, %ss
-
-       sidt (saved_idtr)
-       sti
-       ret