583 lines
12 KiB
Plaintext
583 lines
12 KiB
Plaintext
; CP/M 3 BIOS for Z80-Simulator
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;
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; Copyright (C) 1989-2006 by Udo Munk
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;
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.Z80
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;
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; bdos functions
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;
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WARM EQU 0
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BDOS EQU 5
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PRINT EQU 9
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OPEN EQU 15
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READS EQU 20
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DMA EQU 26
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MULTI EQU 44
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;
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; i/o ports
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;
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CONSTA EQU 0 ;console status port
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CONDAT EQU 1 ;console data port
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PRTSTA EQU 2 ;printer status port
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PRTDAT EQU 3 ;printer data port
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AUXSTA EQU 4 ;auxilary status port
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AUXDAT EQU 5 ;auxilary data port
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FDCD EQU 10 ;fdc-port: # of drive
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FDCT EQU 11 ;fdc-port: # of track
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FDCS EQU 12 ;fdc-port: # of sector
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FDCOP EQU 13 ;fdc-port: command
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FDCST EQU 14 ;fdc-port: status
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DMAL EQU 15 ;dma-port: dma address low
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DMAH EQU 16 ;dma-port: dma address high
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MMUINI EQU 20 ;initialize mmu
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MMUSEL EQU 21 ;bank select mmu
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CLKCMD EQU 25 ;clock command
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CLKDAT EQU 26 ;clock data
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;
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; clock commands
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;
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GETSEC EQU 0 ;get seconds
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GETMIN EQU 1 ;get minutes
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GETHOU EQU 2 ;get hours
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GETDAL EQU 3 ;get days low
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GETDAH EQU 4 ;get days high
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;
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; character device mode byte fields
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;
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mb$input EQU 00000001B ;device may do input
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mb$output EQU 00000010B ;device may do output
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mb$in$out EQU mb$input+mb$output ;device may do both
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baud$none EQU 0
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;
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; external references in scb
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;
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EXTRN @civec, @covec, @aovec, @aivec, @lovec, @bnkbf
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EXTRN @crdma, @crdsk, @fx, @resel, @vinfo, @usrcd
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EXTRN @ermde, @date, @hour, @min, @sec, @mxtpa
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;
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CSEG
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;
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; cp/m 3 jump vector for individual subroutines
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;
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JP BOOT ;perform cold start initialization
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WBOOTE: JP WBOOT ;perform warm start initialization
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JP CONST ;check for console input char ready
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JP CONIN ;read console character in
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JP CONOUT ;write console character out
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JP LIST ;write list character out
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JP AUXOUT ;write auxiliary output char
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JP AUXIN ;read auxiliary input char
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JP HOME ;move head to track 0 on selcted disk
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JP SELDSK ;select disk drive
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JP SETTRK ;set track number
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JP SETSEC ;set sector number
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JP SETDMA ;set dma address
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JP READ ;read specified sector
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JP WRITE ;write specified sector
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JP LISTST ;return list status
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JP SECTRAN ;translate logical to physical sector
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JP CONOST ;return output status of console
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JP AUXIST ;return input status of aux. port
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JP AUXOST ;return output status of aux. port
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JP DEVTBL ;return address of character i/o table
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JP DEVINI ;initialize character i/o devices
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JP DRVTBL ;return address of disk drive table
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JP MULTIO ;set number of sectors to read/write
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JP FLUSH ;flush deblocking buffers
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JP MOVE ;memory to memory move
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JP TIME ;time set/get signal
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JP SELMEM ;select bank of memory
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JP SETBNK ;specify bank for dma operation
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JP XMOVE ;set bank for memory dma transfer
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JP 0 ;reserved for system implementor
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JP 0 ;reserved for future use
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JP 0 ;reserved for future use
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;
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; drive table
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;
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DRIVES: DW DPH0
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DW DPH1
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DW DPH2
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DW DPH3
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DW 0
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DW 0
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DW 0
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DW 0
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DW DPH8
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DW DPH9
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DW 0
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DW 0
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DW 0
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DW 0
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DW 0
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DW 0
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;
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; fixed data tables for IBM-compatible 8" disks
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;
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; disk parameter header
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;
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DPH0: DEFW TRANS ;sector translation table
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DB 0,0,0,0,0,0,0,0,0 ;bdos scratch area
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DB 0 ;media flag
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DEFW DPB0 ;disk parameter block
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DEFW 0FFFEH ;checksum vector
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DEFW 0FFFEH ;allocation vector
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DEFW 0FFFEH ;directory buffer control block
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DEFW 0FFFFH ;dtabcb not used
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DEFW 0FFFEH ;hashing
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DEFB 0 ;hash bank
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DPH1: DEFW TRANS ;sector translation table
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DB 0,0,0,0,0,0,0,0,0 ;bdos scratch area
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DB 0 ;media flag
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DEFW DPB0 ;disk parameter block
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DEFW 0FFFEH ;checksum vector
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DEFW 0FFFEH ;allocation vector
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DEFW 0FFFEH ;directory buffer control block
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DEFW 0FFFFH ;dtabcb not used
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DEFW 0FFFEH ;hashing
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DEFB 0 ;hash bank
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DPH2: DEFW TRANS ;sector translation table
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DB 0,0,0,0,0,0,0,0,0 ;bdos scratch area
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DB 0 ;media flag
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DEFW DPB0 ;disk parameter block
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DEFW 0FFFEH ;checksum vector
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DEFW 0FFFEH ;allocation vector
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DEFW 0FFFEH ;directory buffer control block
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DEFW 0FFFFH ;dtabcb not used
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DEFW 0FFFEH ;hashing
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DEFB 0 ;hash bank
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DPH3: DEFW TRANS ;sector translation table
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DB 0,0,0,0,0,0,0,0,0 ;bdos scratch area
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DB 0 ;media flag
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DEFW DPB0 ;disk parameter block
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DEFW 0FFFEH ;checksum vector
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DEFW 0FFFEH ;allocation vector
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DEFW 0FFFEH ;directory buffer control block
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DEFW 0FFFFH ;dtabcb not used
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DEFW 0FFFEH ;hashing
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DEFB 0 ;hash bank
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;
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; sector translate vector for the IBM 8" disk
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;
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TRANS: DEFB 1,7,13,19 ;sectors 1,2,3,4
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DEFB 25,5,11,17 ;sectors 5,6,7,8
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DEFB 23,3,9,15 ;sectors 9,10,11,12
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DEFB 21,2,8,14 ;sectors 13,14,15,16
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DEFB 20,26,6,12 ;sectors 17,18,19,20
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DEFB 18,24,4,10 ;sectors 21,22,23,24
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DEFB 16,22 ;sectors 25,26
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;
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; disk parameter block for the IBM 8" disk
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;
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DPB0: DEFW 26 ;sectors per track
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DEFB 3 ;block shift factor
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DEFB 7 ;block mask
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DEFB 0 ;extent mask
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DEFW 242 ;disk size-1
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DEFW 63 ;directory max
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DEFB 192 ;alloc 0
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DEFB 0 ;alloc 1
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DEFW 16 ;check size
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DEFW 2 ;track offset
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DEFB 0,0 ;physical sector size and shift
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;
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; fixed data tables for 4mb harddisks
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;
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; disk parameter header
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;
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DPH8: DEFW HDTRA ;sector translation table
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DB 0,0,0,0,0,0,0,0,0 ;bdos scratch area
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DB 0 ;media flag
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DEFW DPB1 ;disk parameter block
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DEFW 0FFFEH ;checksum vector
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DEFW 0FFFEH ;allocation vector
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DEFW 0FFFEH ;directory buffer control block
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DEFW 0FFFFH ;dtabcb not used
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DEFW 0FFFEH ;hashing
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DEFB 0 ;hash bank
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DPH9: DEFW HDTRA ;sector translation table
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DB 0,0,0,0,0,0,0,0,0 ;bdos scratch area
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DB 0 ;media flag
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DEFW DPB1 ;disk parameter block
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DEFW 0FFFEH ;checksum vector
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DEFW 0FFFEH ;allocation vector
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DEFW 0FFFEH ;directory buffer control block
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DEFW 0FFFFH ;dtabcb not used
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DEFW 0FFFEH ;hashing
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DEFB 0 ;hash bank
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;
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; sector translate vector for 4mb harddisk
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;
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HDTRA: DEFB 1,2,3,4,5,6,7,8,9,10
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DEFB 11,12,13,14,15,16,17,18,19,20
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DEFB 21,22,23,24,25,26,27,28,29,30
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DEFB 31,32,33,34,35,36,37,38,39,40
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DEFB 41,42,43,44,45,46,47,48,49,50
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DEFB 51,52,53,54,55,56,57,58,59,60
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DEFB 61,62,63,64,65,66,67,68,69,70
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DEFB 71,72,73,74,75,76,77,78,79,80
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DEFB 81,82,83,84,85,86,87,88,89,90
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DEFB 91,92,93,94,95,96,97,98,99,100
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DEFB 101,102,103,104,105,106,107,108,109,110
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DEFB 111,112,113,114,115,116,117,118,119,120
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DEFB 121,122,123,124,125,126,127,128
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;
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; disk parameter block for 4mb harddisk
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;
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DPB1: DEFW 128 ;sectors per track
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DEFB 4 ;block shift factor
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DEFB 15 ;block mask
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DEFB 0 ;extent mask
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DEFW 2039 ;disk size-1
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DEFW 1023 ;directory max
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DEFB 255 ;alloc 0
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DEFB 255 ;alloc 1
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DEFW 0 ;check size
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DEFW 0 ;track offset
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DEFB 0,0 ;physical sector size and shift
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;
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; character device table
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;
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CHRTBL: DEFB 'CRT '
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DEFB mb$in$out
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DEFB baud$none
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DEFB 'LPT '
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DEFB mb$output
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DEFB baud$none
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DEFB 'PTP '
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DEFB mb$output
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DEFB baud$none
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DEFB 'PTR '
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DEFB mb$input
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DEFB baud$none
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DEFB 0
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;
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; signon message
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;
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SIGNON: DEFB 13,10
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DEFM 'BANKED BIOS3 V1.4 for Z80SIM, '
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DEFM 'Copyright 1989-2006 by Udo Munk'
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DEFB 13,10
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DEFB 0
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;
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; small stack
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;
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DS 8
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STACK:
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;
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; fcb for loading ccp
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;
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CCPFCB: DEFB 1,'CCP COM',0,0,0,0
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DEFB 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
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CCPREC: DEFB 0,0,0
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;
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DSEG
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;
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; bios error messages
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;
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CCPOER: DEFB 13,10,'BIOS ERROR: cannot open CCP.COM',13,10,'$'
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CCPIOE: DEFB 13,10,'BIOS ERROR: reading CCP.COM',13,10,'$'
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;
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CSEG
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;
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DRIVE: DEFB 0 ;drive to select
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BANK: DEFB 0 ;bank to select for dma
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;
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; end of fixed tables
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;
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; individual subroutines to perform each function
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;
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DSEG
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;
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BOOT: LD B,1 ;indicate cold boot
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;
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LD HL,8000H
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LD (@civec),HL ;CONSOLE:=CON for input
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LD (@covec),HL ;CONSOLE:=CON for output
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LD HL,4000H
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LD (@lovec),HL ;LST:=LPT
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LD HL,2000H
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LD (@aovec),HL ;AUXOUT:=PTP
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LD HL,1000H
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LD (@aivec),HL ;AUXIN:=PTR
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;
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LD A,3 ;initialize 3 memory banks
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OUT (MMUINI),A
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JP WBOOT1
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;
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CSEG
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;
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WBOOT: LD B,0 ;indicate warm boot
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WBOOT1: LD SP,STACK
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;
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; initialize low memory jumps in bank 1
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;
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LD A,1
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CALL SELMEM
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;
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LD A,0C3H ;jmp instruction
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LD (WARM),A
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LD HL,WBOOTE ;warm boot enty point
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LD (WARM+1),HL
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LD (BDOS),A
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LD HL,(@mxtpa) ;bdos entry point
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LD (BDOS+1),HL
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;
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; print message on cold boot
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;
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LD A,B
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OR A
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JP Z,LDCCP
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LD HL,SIGNON ;print message
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WBOOT2: LD A,(HL)
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OR A
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JP Z,LDCCP
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LD C,A
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CALL CONOUT
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INC HL
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JP WBOOT2
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;
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; load ccp.com into tpa
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;
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LDCCP: XOR A ;initialize fcb
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LD (CCPFCB+15),A
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LD HL,0
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LD (CCPREC),HL
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LD DE,CCPFCB ;open file ccp.com
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LD C,OPEN
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CALL BDOS
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LD DE,CCPOER
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INC A
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JP Z,CCPERR ;print error if file not found
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LD DE,0100H ;setup DMA to tpa
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LD C,DMA
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CALL BDOS
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LD DE,128 ;read up to 16KB
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LD C,MULTI
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CALL BDOS
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LD DE,CCPFCB ;read the ccp into memory
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LD C,READS
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CALL BDOS
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LD DE,CCPIOE
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INC A
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JP NZ,0100H ;start ccp
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CCPERR: LD C,PRINT ;print error message
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CALL BDOS
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HALT
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;
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; character i/o drivers
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;
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DEVTBL: LD HL,CHRTBL
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RET
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;
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; character device initialization
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;
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DEVINI: RET
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;
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; console in status, return 0ffh if character ready, 00h if not
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;
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CONST: IN A,(CONSTA)
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RET
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;
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; console character input from register a
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;
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CONIN: IN A,(CONDAT)
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RET
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;
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; console out status, return 0ffh if ready, 00h if not
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CONOST: LD A,0FFH ;console out always ready
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RET
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;
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; console character output from register c
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;
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CONOUT: LD A,C ;get to accumulator
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OUT (CONDAT),A ;send character to console
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RET
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;
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; list out status, return 0ffh if ready, 00h if not
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;
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LISTST: LD A,0FFH ;list out always ready
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RET
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;
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; list character output from register C
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;
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LIST: LD A,C
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OUT (PRTDAT),A
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RET
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;
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; auxilary input status, 0ffh if ready, 00h if not
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;
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AUXIST: XOR A ;never ready, hardware not available yet
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RET
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;
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; auxilary output status, 0ffh if ready, 00h if not
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;
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AUXOST: XOR A ;never ready, hadware not available yet
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RET
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;
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; auxilary input
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;
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AUXIN: IN A,(AUXDAT)
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RET
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;
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; auxilary output from register c
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;
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AUXOUT: LD A,C
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OUT (AUXDAT),A
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RET
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;
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;
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; i/o drivers for the disks
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;
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DRVTBL: LD HL,DRIVES
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RET
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;
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DSEG
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;
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; move to the track 00 position of current drive
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; translate this call into a settrk call with parameter 00
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;
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HOME: LD C,0 ;select track 0
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JP SETTRK ;we will move to 00 on first read/write
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;
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; select disk given by register C
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;
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SELDSK: LD HL,0000H ;error return code
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LD A,C
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LD (DRIVE),A
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CP 4 ;disk drive 1-4?
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JP C,SEL1 ;go
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CP 8 ;harddisk 1?
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JP Z,SEL1 ;go
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CP 9 ;harddisk 2?
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RET NZ ;no, error
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; disk number is in the proper range
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; return proper disk parameter header address
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SEL1: LD L,C
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LD H,0
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ADD HL,HL ;drive index in hl
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LD BC,DRIVES
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ADD HL,BC ;get pointer to dph
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LD A,(HL)
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INC HL
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LD H,(HL)
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LD L,A
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LD A,(DRIVE)
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OUT (FDCD),A ;selekt disk drive
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RET
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;
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; set track given by register c
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;
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SETTRK: LD A,C
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OUT (FDCT),A
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RET
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;
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; set sector given by register c
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;
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SETSEC: LD A,C
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OUT (FDCS),A
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RET
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;
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; translate the sector given by bc using the
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; translate table given by de
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;
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SECTRAN:
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EX DE,HL ;hl=.trans
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ADD HL,BC ;hl=.trans(sector)
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LD L,(HL) ;l = trans(sector)
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LD H,0 ;hl= trans(sector)
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RET ;with value in HL
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;
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; set dma address given by registers b and c
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;
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SETDMA: LD A,C ;low order address
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OUT (DMAL),A
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LD A,B ;high order address
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OUT (DMAH),A
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RET
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;
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CSEG
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;
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; perform read operation
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;
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READ: LD A,(BANK) ;switch to saved bank
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OUT (MMUSEL),A
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XOR A ;read command -> A
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JP WAITIO ;to perform the actual i/o
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;
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; perform write operation
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;
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WRITE: LD A,(BANK) ;switch to saved bank
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OUT (MMUSEL),A
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LD A,1 ;write command -> A
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;
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; enter here from read and write to perform the actual i/o
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; operation. return 00h in register a if the operation completes
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; properly, and 01h if an error occurs during the read or write
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;
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WAITIO: OUT (FDCOP),A ;start i/o operation
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XOR A ;reselect bank 0
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OUT (MMUSEL),A
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IN A,(FDCST) ;status of i/o operation -> A
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RET
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;
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; nothing to do
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;
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MULTIO: XOR A
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RET
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;
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; nothing to do
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;
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FLUSH: XOR A
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RET
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;
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; memory move
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;
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MOVE: EX DE,HL
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LDIR
|
|
EX DE,HL
|
|
RET
|
|
;
|
|
; select memory bank
|
|
SELMEM: OUT (MMUSEL),A
|
|
RET
|
|
;
|
|
; specify memory bank for dma operation
|
|
SETBNK: LD (BANK),A
|
|
RET
|
|
;
|
|
; xmove not implemented yet, hardware missing
|
|
;
|
|
XMOVE: RET
|
|
;
|
|
; get/set time
|
|
;
|
|
TIME:
|
|
LD A,C
|
|
CP 0FFH
|
|
RET Z ;we cannot set the UNIX time from here
|
|
LD A,GETSEC ;get seconds
|
|
OUT (CLKCMD),A
|
|
IN A,(CLKDAT)
|
|
LD (@sec),A
|
|
LD A,GETMIN ;get minutes
|
|
OUT (CLKCMD),A
|
|
IN A,(CLKDAT)
|
|
LD (@min),A
|
|
LD A,GETHOU ;get hours
|
|
OUT (CLKCMD),A
|
|
IN A,(CLKDAT)
|
|
LD (@hour),A
|
|
LD A,GETDAL ;get day
|
|
OUT (CLKCMD),A
|
|
IN A,(CLKDAT)
|
|
LD (@date),A
|
|
LD A,GETDAH
|
|
OUT (CLKCMD),A
|
|
IN A,(CLKDAT)
|
|
LD (@date+1),A
|
|
RET
|
|
;
|
|
ENDDAT EQU $ ;end
|
|
END ;of BIOS
|