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driver.s
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IDE_DRIVER.Enter:
#Subject to change if necessary
MOV CS_HD INTO CHIP_SELECT
#Arrange our location table
MOV8 IDE_DRIVER.Cyl[2] INTO IDE_DRIVER.Cyl23
MOV8 IDE_DRIVER.Cyl[0] INTO IDE_DRIVER.Cyl01
#Setup our pointers for the location loop
MOVADDR IDE_DRIVER.RegTable INTO IDE_DRIVER.RegPtr[1]
MOVADDR IDE_DRIVER.LocTable INTO IDE_DRIVER.LocPtr1[1]
MOV N_[0] INTO IDE_DRIVER.LocationLoop
IDE_DRIVER.SetupLoop:
#Enter sector count - always 1
MOV N_[0b0100] INTO STATUS_BUS
IDE_DRIVER.RegPtr:
LOD 0x0000
STR DATA_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b0100] INTO STATUS_BUS
IDE_DRIVER.LocPtr1:
LOD 0x0000
STR DATA_BUS
MOV N_[0b0000] INTO STATUS_BUS
INC16 IDE_DRIVER.LocPtr1[1] INTO IDE_DRIVER.LocPtr2[1]
MOV N_[0b0100] INTO STATUS_BUS
IDE_DRIVER.LocPtr2:
LOD 0x0000
STR DATA_BUS
MOV N_[0b0000] INTO STATUS_BUS
INC16 IDE_DRIVER.LocPtr2[1] INTO IDE_DRIVER.LocPtr1[1]
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
INC16 IDE_DRIVER.RegPtr[1]
INC IDE_DRIVER.LocationLoop
#will never cause carry, and leaves value in acc
ADD N_[B]
LOGNOT ACC
JMP IDE_DRIVER.SetupLoop
#Repeat 5 times
#Control flow splits here:
#If they wrote zero to ZeroToWrite, skip
#ahead to the write driver
MOV N_[0] INTO IDE_DRIVER.LoopCount[0]
MOV N_[0] INTO IDE_DRIVER.LoopCount[1]
MOV N_[0] INTO IDE_DRIVER.LoopCount[2]
MOV N_[0] INTO IDE_DRIVER.LoopCount[3]
LOD IDE_DRIVER.ZeroToWrite
JMP IDE_DRIVER.Write
#-----------------------------------------------------------------
#Code to read:
#Tell it to start reading
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[F] INTO DATA_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[2] INTO DATA_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[0] INTO DATA_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
IDE_DRIVER.CheckReadLoop:
#Wait for ready
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[F] INTO DATA_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b1000] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b1000] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b1000] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b1000] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b1000] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b1000] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b1000] INTO STATUS_BUS
LOD DATA_BUS
STR IDE_DRIVER.Status[0]
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b1000] INTO STATUS_BUS
LOD DATA_BUS
STR IDE_DRIVER.Status[1]
MOV N_[0b0000] INTO STATUS_BUS
#Loop until MSB of .Status[1] is 1
LOD IDE_DRIVER.Status[1]
ADD N_[8]
GETCARR ACC
JMP IDE_DRIVER.CheckReadLoop
#Drive is ready, time to start reading
MOV16 IDE_DRIVER.DataPtr INTO IDE_DRIVER.RPtr1[1]
NOP 0d1000
IDE_DRIVER.ReadLoop:
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[8] INTO DATA_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b1000] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b1000] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b1000] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b1000] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
#When it starts presenting data,
#take that data and put it into memory.
#Increment the memory pointer each time;
#writing sixteen bits each time through
#this loop.
INC16 IDE_DRIVER.RPtr1[1] INTO IDE_DRIVER.RPtr2[1]
INC16 IDE_DRIVER.RPtr2[1] INTO IDE_DRIVER.RPtr3[1]
INC16 IDE_DRIVER.RPtr3[1] INTO IDE_DRIVER.RPtr4[1]
MOV N_[0b1000] INTO STATUS_BUS
LOD DATA_BUS
IDE_DRIVER.RPtr3:
STR 0x0000
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b1000] INTO STATUS_BUS
LOD DATA_BUS
IDE_DRIVER.RPtr4:
STR 0x0000
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b1000] INTO STATUS_BUS
LOD DATA_BUS
IDE_DRIVER.RPtr1:
STR 0x0000
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b1000] INTO STATUS_BUS
LOD DATA_BUS
IDE_DRIVER.RPtr2:
STR 0x0000
MOV N_[0b0000] INTO STATUS_BUS
INC16 IDE_DRIVER.RPtr4[1] INTO IDE_DRIVER.RPtr1[1]
#Control flow - this loop only goes around 256 times
INC8 IDE_DRIVER.LoopCount
JMPEQ8 IDE_DRIVER.LoopCount IDE_DRIVER.ZeroByte TO IDE_DRIVER.DoneReadLoop
LOD N_[0]
JMP IDE_DRIVER.ReadLoop
IDE_DRIVER.DoneReadLoop:
LOD N_[0]
JMP IDE_DRIVER.Done
#-----------------------------------------------------------------------------
IDE_DRIVER.Write:
#Tell it to start writing (0x30 to reg F)
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[F] INTO DATA_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[3] INTO DATA_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[0] INTO DATA_BUS
MOV N_[0b0000] INTO STATUS_BUS
#execute
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV16 IDE_DRIVER.DataPtr INTO IDE_DRIVER.WPtr4[1]
IDE_DRIVER.WriteLoop:
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[8] INTO DATA_BUS
MOV N_[0b0000] INTO STATUS_BUS
#This code self-modifies by inserting the data pointer
#provided into the LOD instructions below, then incrementing it
#and putting the result in the other LOD instruction
INC16 IDE_DRIVER.WPtr4[1] INTO IDE_DRIVER.WPtr3[1]
INC16 IDE_DRIVER.WPtr3[1] INTO IDE_DRIVER.WPtr2[1]
INC16 IDE_DRIVER.WPtr2[1] INTO IDE_DRIVER.WPtr1[1]
MOV N_[0b0100] INTO STATUS_BUS
IDE_DRIVER.WPtr1:
LOD 0x0000
STR DATA_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b0100] INTO STATUS_BUS
IDE_DRIVER.WPtr2:
LOD 0x0000
STR DATA_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b0100] INTO STATUS_BUS
IDE_DRIVER.WPtr3:
LOD 0x0000
STR DATA_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b0100] INTO STATUS_BUS
IDE_DRIVER.WPtr4:
LOD 0x0000
STR DATA_BUS
MOV N_[0b0000] INTO STATUS_BUS
INC16 IDE_DRIVER.WPtr1[1] INTO IDE_DRIVER.WPtr4[1]
#execute
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
#Control flow - this loop only goes around 256 times
INC8 IDE_DRIVER.LoopCount
JMPEQ8 IDE_DRIVER.LoopCount IDE_DRIVER.ZeroByte TO IDE_DRIVER.DoneWriteLoop
LOD N_[0]
JMP IDE_DRIVER.WriteLoop
IDE_DRIVER.DoneWriteLoop:
IDE_DRIVER.CheckWriteLoop:
#Check for error codes
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[F] INTO DATA_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b1000] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b1000] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b1000] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b1000] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b1000] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b1000] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
#execute
MOV N_[0b1000] INTO STATUS_BUS
LOD DATA_BUS
STR IDE_DRIVER.Status[0]
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b1000] INTO STATUS_BUS
LOD DATA_BUS
STR IDE_DRIVER.Status[1]
MOV N_[0b0000] INTO STATUS_BUS
#Loop until MSB of .Status[1] is 0
LOD IDE_DRIVER.Status[1]
ADD N_[8]
GETCARR ACC
LOGNOT ACC
JMP IDE_DRIVER.CheckWriteLoop
#Check the status register one last time,
#leaving the code for the higher-level coder.
MOV N_[0b0100] INTO STATUS_BUS
MOV N_[F] INTO DATA_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b1000] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b1000] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b1000] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b1000] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b1000] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b1000] INTO STATUS_BUS
MOV N_[0b0000] INTO STATUS_BUS
#execute
MOV N_[0b1000] INTO STATUS_BUS
LOD DATA_BUS
STR IDE_DRIVER.Status[0]
MOV N_[0b0000] INTO STATUS_BUS
MOV N_[0b1000] INTO STATUS_BUS
LOD DATA_BUS
STR IDE_DRIVER.Status[1]
MOV N_[0b0000] INTO STATUS_BUS
IDE_DRIVER.Done:
MOV N_[F] INTO CHIP_SELECT
#Exit - this needs the return address to be supplied
LOD N_[0]
IDE_DRIVER.Exit:
JMP 0x0000
IDE_DRIVER.Cyl: .data 4
IDE_DRIVER.ZeroToWrite: .data 1
IDE_DRIVER.RegTable: .data 5 0xABCDE
IDE_DRIVER.LocTable:
IDE_DRIVER.SecCount: .data 2 0x01
IDE_DRIVER.SecNum: .data 2
IDE_DRIVER.Cyl23: .data 2
IDE_DRIVER.Cyl01: .data 2
IDE_DRIVER.Head: .data 2 0xE0
IDE_DRIVER.DataPtr: .data 4
IDE_DRIVER.LoopCount: .data 2 0x0
IDE_DRIVER.LocationLoop: .data 1 0x0
IDE_DRIVER.Status: .data 2
IDE_DRIVER.ZeroByte: .data 2 0x00