Write-combine framebuffer writes through user-space mappings, if possible.
Note that KVA mapping of the framebuffer already uses write-combining mode, so the change, besides improving speed of user mode writes, also satisfies requirement of the IA32 architecture of using consistent caching modes for multiple mappings of the same page. Reported and tested by: bde Sponsored by: The FreeBSD Foundation MFC after: 1 week
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@ -1643,6 +1643,9 @@ vesa_mmap(video_adapter_t *adp, vm_ooffset_t offset, vm_paddr_t *paddr,
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if (offset > adp->va_window_size - PAGE_SIZE)
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return (-1);
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*paddr = adp->va_info.vi_buffer + offset;
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#ifdef VM_MEMATTR_WRITE_COMBINING
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*memattr = VM_MEMATTR_WRITE_COMBINING;
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#endif
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return (0);
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}
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return ((*prevvidsw->mmap)(adp, offset, paddr, prot, memattr));
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