2014-07-23 19:45:02 +02:00
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From 9054622c8f9f227773bc32403859e0072a1630a1 Mon Sep 17 00:00:00 2001
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2011-12-11 03:42:09 +01:00
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From: Alexander Graf <agraf@suse.de>
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2009-08-11 17:37:13 +02:00
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Date: Tue, 14 Apr 2009 16:24:15 +0200
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2012-02-01 00:10:40 +01:00
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Subject: [PATCH] qemu-cvs-alsa_mmap
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2009-08-11 17:37:13 +02:00
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Hack to prevent ALSA from using mmap() interface to simplify emulation.
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2011-12-11 03:42:09 +01:00
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Signed-off-by: Alexander Graf <agraf@suse.de>
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2009-08-11 17:37:13 +02:00
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Signed-off-by: Ulrich Hecht <uli@suse.de>
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---
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2014-01-17 23:04:30 +01:00
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linux-user/mmap.c | 14 ++++++++++++++
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1 file changed, 14 insertions(+)
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2009-08-11 17:37:13 +02:00
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diff --git a/linux-user/mmap.c b/linux-user/mmap.c
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2013-07-30 14:36:48 +02:00
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index a249f0c..34a5615 100644
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2009-08-11 17:37:13 +02:00
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--- a/linux-user/mmap.c
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+++ b/linux-user/mmap.c
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2013-07-30 14:36:48 +02:00
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@@ -366,6 +366,9 @@ abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size)
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2011-02-16 20:30:51 +01:00
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}
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2007-07-10 18:55:54 +02:00
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}
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+#define SNDRV_PCM_MMAP_OFFSET_STATUS 0x80000000
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+#define SNDRV_PCM_MMAP_OFFSET_CONTROL 0x81000000
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+
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/* NOTE: all the constants are the HOST ones */
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2007-11-13 21:32:02 +01:00
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abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
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int flags, int fd, abi_ulong offset)
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2013-07-30 14:36:48 +02:00
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@@ -400,6 +403,17 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
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2007-07-10 18:55:54 +02:00
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}
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#endif
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+ /* Alsa tries to communcate with the kernel via mmap. This usually
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2011-12-11 03:42:09 +01:00
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+ * is a good idea when user- and kernelspace are running on the
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2007-07-10 18:55:54 +02:00
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+ * same architecture but does not work out when not. To make alsa
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+ * not to use mmap, we can just have it fail on the mmap calls that
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+ * would initiate this.
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+ */
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+ if(offset == SNDRV_PCM_MMAP_OFFSET_STATUS || offset == SNDRV_PCM_MMAP_OFFSET_CONTROL) {
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+ errno = EINVAL;
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+ return -1;
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+ }
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+
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if (offset & ~TARGET_PAGE_MASK) {
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errno = EINVAL;
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2009-08-11 17:37:13 +02:00
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goto fail;
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