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diff runtime.S @ 149:139e5dcd6aa3

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Make writes to control and data port block when DMA is in progress
author Mike Pavone <pavone@retrodev.com>
date Tue, 01 Jan 2013 07:06:57 -0800
parents 15b8dce19cf4
children 3e68e517cc01
line wrap: on
line diff
--- a/runtime.S	Tue Jan 01 07:04:48 2013 -0800
+++ b/runtime.S	Tue Jan 01 07:06:57 2013 -0800
@@ -209,6 +209,9 @@
 	push %rbx
 	/* fetch VDP context pointer from 68K context */
 	mov 128(%rsi), %rdx
+	/* check DMA flag */
+	bt $6, 19(%rdx)
+	jc fifo_fallback
 	/* get fifo_cur and compare it to fifo_end */
 	mov (%rdx), %rbx
 	cmp %rbx, 8(%rdx)