bdaf61259a
Update to v2.4.0 OBS-URL: https://build.opensuse.org/request/show/329598 OBS-URL: https://build.opensuse.org/package/show/Virtualization/qemu?expand=0&rev=271
46 lines
1.5 KiB
Diff
46 lines
1.5 KiB
Diff
From e467d93b8c067719e5f240096d85a2c72f025d8d Mon Sep 17 00:00:00 2001
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From: Alexander Graf <agraf@suse.de>
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Date: Tue, 14 Apr 2009 16:24:15 +0200
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Subject: [PATCH] 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: Alexander Graf <agraf@suse.de>
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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 file changed, 14 insertions(+)
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diff --git a/linux-user/mmap.c b/linux-user/mmap.c
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index 78e1b2d..5fd32f1 100644
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--- a/linux-user/mmap.c
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+++ b/linux-user/mmap.c
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@@ -367,6 +367,9 @@ abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size)
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}
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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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@@ -401,6 +404,17 @@ 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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