From: Arne Welzel <arne.welzel@gmail.com>
Date: Wed, 14 Nov 2012 21:43:42 +0000 (+0100)
Subject: libaudiodriver: allocate mem lower 16 MB and 64K aligned
X-Git-Tag: v3.3.0~834
X-Git-Url: http://zhaoyanbai.com/repos/CHANGES?a=commitdiff_plain;h=refs%2Fchanges%2F52%2F752%2F2;p=minix.git

libaudiodriver: allocate mem lower 16 MB and 64K aligned

Righ now, the DMA controller will access some random memory below 16 MB,
as the physical address returned by alloc_contig() is simply truncated
when given to the DMA controller.

Yes, it's bad...
---

diff --git a/lib/libaudiodriver/audio_fw.c b/lib/libaudiodriver/audio_fw.c
index 5b9ea47e3..58ce03a4f 100644
--- a/lib/libaudiodriver/audio_fw.c
+++ b/lib/libaudiodriver/audio_fw.c
@@ -929,7 +929,7 @@ static int init_buffers(sub_dev_t *sub_dev_ptr)
 
 	/* allocate dma buffer space */
 	size= sub_dev_ptr->DmaSize + 64 * 1024;
-	base= alloc_contig(size, AC_ALIGN4K, &ph);
+	base= alloc_contig(size, AC_ALIGN64K|AC_LOWER16M, &ph);
 	if (!base) {
 		printf("%s: failed to allocate dma buffer for a channel\n", 
 				drv.DriverName);