Messages in this thread | | | From | Bartlomiej Zolnierkiewicz <> | Subject | Re: Worrisome IDE PIO transfers... | Date | Sun, 29 Feb 2004 21:36:33 +0100 |
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On Sunday 29 of February 2004 20:23, Richard Zidlicky wrote: > On Sun, Feb 29, 2004 at 09:52:08AM +0100, Geert Uytterhoeven wrote: > > On Sun, 29 Feb 2004, Bartlomiej Zolnierkiewicz wrote: > > > On Sunday 29 of February 2004 01:58, Jeff Garzik wrote: > > > > > I like Alan's idea to use loopback instead of "bswap". > > > > > > > > Neat but no more zerocopy that way. I much prefer a > > > > swap-as-you-go... > > > > > > Okay, better solution: > > > > > > - on Atari/Q40: > > > if drive->bswap use insw/outsw instead of swapping variants > > > > Yep, that sounds the most logical. Richard? > > looks good. > > However it appears to fix only part of the problem - we need some > logic to ensure only disk data is swapped. > Bswapping WIN_DOWNLOAD_MICROCODE data would not be very > clever I guess.
Actually drive->bswap should die as I overlooked the fact that we are _not_ swapping disk data (byteswapped data is used for FS) on Atari/Q40.
Therefore the real solution is to use device-mapper instead of drive->bswap and on Atari/Q40 use standard insw/outs only if blk_fs_request(drive->rq), for everything else insw_swapw/outsw_swapw should be used.
Does it make any sense? :)
Bartlomiej
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