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blockdev: protect IX in routines
Sure, it's a bit slower, but it prevents a lot of hard to debug problems. I don't have to want to remember "don't use IX if you have any blk* calls". Let's optimize I/O later.
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@ -125,7 +125,11 @@ _blkInc:
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; Sets Z according to whether read was successful: Set if successful, unset
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; if not.
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blkGetC:
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push ix
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ld ix, BLOCKDEV_SEL
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call _blkGetC
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pop ix
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ret
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_blkGetC:
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push hl
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push de
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@ -138,7 +142,11 @@ _blkGetC:
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; Writes character in A in current position in the selected device. Sets Z
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; according to whether the operation was successful.
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blkPutC:
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push ix
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ld ix, BLOCKDEV_SEL
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call _blkPutC
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pop ix
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ret
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_blkPutC:
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push ix
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push hl
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@ -155,7 +163,11 @@ _blkPutC:
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; Reads B chars from blkGetC and copy them in (HL).
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; Sets Z if successful, unset Z if there was an error.
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blkRead:
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push ix
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ld ix, BLOCKDEV_SEL
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call _blkRead
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pop ix
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ret
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_blkRead:
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push hl
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push bc
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@ -174,7 +186,11 @@ _blkRead:
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; Writes B chars to blkPutC from (HL).
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; Sets Z if successful, unset Z if there was an error.
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blkWrite:
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push ix
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ld ix, BLOCKDEV_SEL
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call _blkWrite
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pop ix
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ret
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_blkWrite:
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push hl
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push bc
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@ -207,7 +223,11 @@ _blkWrite:
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; If the device is "growable", it's possible that seeking to end when calling
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; PutC doesn't necessarily result in a failure.
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blkSeek:
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push ix
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ld ix, BLOCKDEV_SEL
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call _blkSeek
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pop ix
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ret
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_blkSeek:
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cp BLOCKDEV_SEEK_FORWARD
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jr z, .forward
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@ -275,7 +295,11 @@ _blkSeek:
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; Returns the current position of the selected device in HL (low) and DE (high).
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blkTell:
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push ix
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ld ix, BLOCKDEV_SEL
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call _blkTell
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pop ix
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ret
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_blkTell:
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ld e, (ix+4)
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ld d, (ix+5)
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