On Wed, Jan 12, 2000 at 12:56:27PM +0000, Tim Waugh wrote:
> This patch from Bert De Jonghe avoids a memcpy when it isn't needed.
> Since parport_pc.c is used by several architectures, should this be
> protected with #ifdef __i386__? I'm not sure if architectures like Sparc
> or Alpha have the same DMA limitation.
[...]
> + /* above 16 MB we use a bounce buffer as ISA-DMA is not possible */
> + if ((dma_addr + length) >= 0x1000000L) {
> + maxlen = PAGE_SIZE; /* sizeof(priv->dma_buf) */
> + dma_addr = virt_to_bus((volatile char *) priv->dma_buf);
> + }
> +
You can make this arch-independent by using ISA_DMA_THRESHOLD which is
defined in <asm/scatterlist.h>. This probably isn't a good place to keep
this definition, but it is there.
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