Date: Fri, 26 Jan 1996 18:33:51 -0800 (PST) From: Bruce Evans <bde> To: CVS-committers, cvs-sys Subject: cvs commit: src/sys/i386/isa/sound dmabuf.c Message-ID: <199601270233.SAA16081@freefall.freebsd.org>
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bde 96/01/26 18:33:50
Modified: sys/i386/i386 machdep.c
sys/i386/include md_var.h
sys/i386/isa fd.c isa.c wt.c
sys/i386/isa/sound dmabuf.c
Log:
Allocate DMA bounce buffers only when requested by drivers. Only the
fd and wt drivers need bounce buffers, so this normally saves 32K-1K
of kernel memory.
Keep track of which DMA channels are busy. isa_dmadone() must now be
called when DMA has finished or been aborted.
Panic for unallocated and too-small (required) bounce buffers.
fd.c:
There will be new warnings about isa_dmadone() not being called after
DMA has been aborted.
sound/dmabuf.c:
isa_dmadone() needs more parameters than are available, so temporarily
use a new interface isa_dmadone_nobounce() to avoid having to worry
about panics for fake parameters. Untested.
Revision Changes Path
1.173 +1 -9 src/sys/i386/i386/machdep.c
1.6 +1 -2 src/sys/i386/include/md_var.h
1.78 +2 -1 src/sys/i386/isa/fd.c
1.63 +67 -17 src/sys/i386/isa/isa.c
1.29 +2 -1 src/sys/i386/isa/wt.c
1.22 +4 -1 src/sys/i386/isa/sound/dmabuf.c
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