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sdc: tidy up

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This commit is contained in:
Virgil Dupras 2019-06-19 09:24:16 -04:00
parent d9ae82c81e
commit 66fbd20e21
1 changed files with 11 additions and 16 deletions
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27
kernel/sdc.asm
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@ -356,11 +356,9 @@ sdcReadBlk:
; actual data, but at this point, we don't have any error conditions
; left, success is guaranteed. To avoid needlesssly INCing hl, let's
; set sector and dirty along the way
ld a, e ; sector number LSB
ld (hl), a
inc hl ; sector number MSB
ld a, d
ld (hl), a
ld (hl), e ; sector number LSB
inc hl
ld (hl), d ; sector number MSB
inc hl ; dirty flag
xor a ; unset
ld (hl), a
@ -425,24 +423,23 @@ sdcWriteBlk:
ld ix, (SDC_BUFPTR) ; HL points to sector LSB
xor a
cp (ix+2) ; dirty flag
jr z, .dontWrite ; A is already 0
pop ix
ret z ; don't write if dirst flag is zero
push bc
push de
push hl
call sdcCRC ; DE -> new CRC. HL -> pointer to buf CRC
ld a, d ; write computed CRC
ld (hl), a
ld (hl), d ; write computed CRC
inc hl
ld a, e
ld (hl), a
ld (hl), e
out (SDC_PORT_CSLOW), a
ld a, (ix) ; sector LSB
ld e, a
ld a, (ix+1) ; sector MSB
ld d, a
ld hl, (SDC_BUFPTR) ; sector LSB
ld e, (hl) ; sector LSB
inc hl
ld d, (hl) ; sector MSB
ld hl, 0 ; high addr word always zero, DE already set
ld a, 0b01011000 ; CMD24
call sdcCmd
@ -503,8 +500,6 @@ sdcWriteBlk:
pop hl
pop de
pop bc
.dontWrite:
pop ix
ret
; Considering the first 15 bits of EHL, select the most appropriate of our two