48 lines
1.5 KiB
Diff
48 lines
1.5 KiB
Diff
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From 8dc126f05ef5f8d0105d5d1b77493a27df8b4e30 Mon Sep 17 00:00:00 2001
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From: Ulrich Hecht <uli@suse.de>
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Date: Tue, 14 Apr 2009 16:24:15 +0200
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Subject: [PATCH 05/16] qemu-cvs-alsa_mmap
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Hack to prevent ALSA from using mmap() interface to simplify emulation.
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Signed-off-by: Ulrich Hecht <uli@suse.de>
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---
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linux-user/mmap.c | 14 ++++++++++++++
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1 files changed, 14 insertions(+), 0 deletions(-)
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diff --git a/linux-user/mmap.c b/linux-user/mmap.c
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index 144fb7c..1ea202b 100644
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--- a/linux-user/mmap.c
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+++ b/linux-user/mmap.c
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@@ -328,6 +328,9 @@ abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size)
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return h2g(ptr);
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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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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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@@ -363,6 +366,17 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
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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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+ * is a good idea when user- and kernelspace are running on the
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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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goto fail;
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--
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1.6.4.2
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