Mercurial > hg > Members > kono > nitros9-code
changeset 3063:c0bb75b72339
updated boot_ide.asm with deblocking code to be built with -DDEBLOCK
| author | David Ladd <drencor-xeen@users.sf.net> |
|---|---|
| date | Sun, 08 Feb 2015 17:44:00 -0600 |
| parents | ae77b55c1414 |
| children | ff6d97180a93 |
| files | level1/modules/boot_ide.asm |
| diffstat | 1 files changed, 32 insertions(+), 2 deletions(-) [+] |
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--- a/level1/modules/boot_ide.asm Sun Feb 08 15:39:29 2015 -0800 +++ b/level1/modules/boot_ide.asm Sun Feb 08 17:44:00 2015 -0600 @@ -55,6 +55,9 @@ bootloc RMB 3 sector pointer; not byte pointer bootsize RMB 2 size in bytes LSN0Ptr RMB 2 LSN0 pointer (used by boot_common.asm) + IFDEF DEBLOCK +HalfSect RMB 1 + ENDC size EQU . name FCS /Boot/ @@ -125,6 +128,14 @@ pshs x,b b@ tst Status,y bmi b@ if =1 then loop + IFDEF DEBLOCK + clra clear A so we can hold half sector flag + lsr ,s ok shift the 3 bytes on stack that + ror 1,s hold LSN to the right to create a + ror 2,s divide by 2. Then put last bit in + rola A for use as the half sector flag + sta HalfSect,u then store the flag on the stack + ENDC lda mode,u sta DevHead,y 0L0d/0hhh device=CHS r@ ldb Status,y is IDE ready for commands? @@ -185,6 +196,11 @@ ldx blockloc,u clr ,s + IFDEF DEBLOCK + lda HalfSect,u load half sector flag + cmpa #$01 check to see which routine we + beq Blk2Lp need and branch to it. + ENDC BlkLp lda DataReg,y A <- IDE ldb Latch,y @@ -195,13 +211,27 @@ dec ,s bne b@ +BlkEnx leax -256,x stx 1,s lda Status,y check for error-bit - clrb + clrb puls b,x,pc - + IFDEF DEBLOCK +Blk2Lp + lda DataReg,y A <- IDE + inc ,s Here we toss out the + bpl Blk2Lp first 256 bytes of the sector + clr ,s +b2@ + lda DataReg,y Now we read the second + ldb Latch,y half of the sector and put + std ,x++ into RAM + inc ,s + bpl b2@ go get the rest + bra BlkEnx + ENDC * ------------------------------------------