33 lines
1.1 KiB
Diff
33 lines
1.1 KiB
Diff
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Index: qemu/linux-user/mmap.c
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===================================================================
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--- qemu.orig/linux-user/mmap.c
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+++ qemu/linux-user/mmap.c
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@@ -152,6 +152,9 @@ static int mmap_frag(target_ulong real_s
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return 0;
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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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long target_mmap(target_ulong start, target_ulong len, int prot,
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int flags, int fd, target_ulong offset)
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@@ -192,6 +195,17 @@ long target_mmap(target_ulong start, tar
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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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return -1;
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