X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=src%2Fvideo_asm.s;fp=src%2Fvideo_asm.s;h=1f7995c6914524a1f5cf89a5d7ca5e217bea7781;hb=91fc6b749ad3a64c9a2686952eb30be517c6beb9;hp=0000000000000000000000000000000000000000;hpb=b3d12cd7ebb86b8fafbb3ef9d2aaa9a4797b4f00;p=bootcensus

diff --git a/src/video_asm.s b/src/video_asm.s
new file mode 100644
index 0000000..1f7995c
--- /dev/null
+++ b/src/video_asm.s
@@ -0,0 +1,27 @@
+# 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
+
+	.global wait_vsync
+wait_vsync:
+	mov $0x3da, %dx
+0:	in %dx, %al
+	and $8, %al
+	jnz 0b
+0:	in %dx, %al
+	and $8, %al
+	jz 0b
+	ret