upstream/opnsense-src
1
0
Fork 0
mirror of https://github.com/opnsense/src.git synced 2026-05-28 04:12:45 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

Write-combine framebuffer writes through user-space mappings, if possible.

Browse source 
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
This commit is contained in:
Konstantin Belousov 2017-04-20 15:18:15 +00:00
parent 5d840968f8
commit be4bf62684
1 changed files with 3 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
sys/dev/fb/vesa.c
View file

@ -1643,6 +1643,9 @@ vesa_mmap(video_adapter_t *adp, vm_ooffset_t offset, vm_paddr_t *paddr,
if (offset > adp->va_window_size - PAGE_SIZE)
return (-1);
*paddr = adp->va_info.vi_buffer + offset;
#ifdef VM_MEMATTR_WRITE_COMBINING
*memattr = VM_MEMATTR_WRITE_COMBINING;
#endif
return (0);
}
return ((*prevvidsw->mmap)(adp, offset, paddr, prot, memattr));