backported fixes from 256boss

[bootcensus] / src / video_asm.s

diff --git a/src/video_asm.s b/src/video_asm.s
index 1f7995c..ac91fd0 100644 (file)
--- a/src/video_asm.s
+++ b/src/video_asm.s
@@ -25,3 +25,20 @@ wait_vsync:
        and $8, %al
        jz 0b
        ret
+
+       .global set_pal_entry
+set_pal_entry:
+       mov 4(%esp), %al
+       mov $0x3c8, %dx
+       out %al, %dx
+       inc %dx
+       mov 8(%esp), %al
+       shr $2, %al
+       out %al, %dx
+       mov 12(%esp), %al
+       shr $2, %al
+       out %al, %dx
+       mov 16(%esp), %al
+       shr $2, %al
+       out %al, %dx
+       ret