diff options
Diffstat (limited to 'sys/amd64/isa/isa.c')
| -rw-r--r-- | sys/amd64/isa/isa.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/sys/amd64/isa/isa.c b/sys/amd64/isa/isa.c index f0fee05..89dd774 100644 --- a/sys/amd64/isa/isa.c +++ b/sys/amd64/isa/isa.c @@ -34,7 +34,7 @@ * SUCH DAMAGE. * * from: @(#)isa.c 7.2 (Berkeley) 5/13/91 - * $Id: isa.c,v 1.33 1994/10/25 23:06:15 se Exp $ + * $Id: isa.c,v 1.34 1994/10/26 00:16:20 phk Exp $ */ /* @@ -691,6 +691,15 @@ void isa_dmastart(int flags, caddr_t addr, unsigned nbytes, unsigned chan) * byte mode channels. */ /* set dma channel mode, and reset address ff */ + + /* If B_RAW flag is set, then use autoinitialise mode */ + if (flags & B_RAW) { + if (flags & B_READ) + outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_WRITE|chan); + else + outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_READ|chan); + } + else if (flags & B_READ) outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan); else @@ -715,6 +724,15 @@ void isa_dmastart(int flags, caddr_t addr, unsigned nbytes, unsigned chan) * word mode channels. */ /* set dma channel mode, and reset address ff */ + + /* If B_RAW flag is set, then use autoinitialise mode */ + if (flags & B_RAW) { + if (flags & B_READ) + outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_WRITE|(chan&3)); + else + outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_READ|(chan&3)); + } + else if (flags & B_READ) outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|(chan&3)); else |
