mirror of https://github.com/wwarthen/RomWBW.git
Wayne Warthen
6 years ago
14 changed files with 264 additions and 57 deletions
@ -1,14 +0,0 @@ |
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@echo off |
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setlocal |
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set TOOLS=../../Tools |
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set PATH=%TOOLS%\tasm32;%TOOLS%\zx;%PATH% |
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set TASMTABS=%TOOLS%\tasm32 |
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set ZXBINDIR=%TOOLS%/cpm/bin/ |
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set ZXLIBDIR=%TOOLS%/cpm/lib/ |
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set ZXINCDIR=%TOOLS%/cpm/include/ |
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tasm -t80 -g3 -fFF bl.asm bl.bin bl.lst |
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@ -1,6 +0,0 @@ |
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@echo off |
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setlocal |
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if exist *.bin del *.bin |
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if exist *.lst del *.lst |
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if exist *.sys del *.sys |
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@ -0,0 +1,228 @@ |
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;=============================================================================== |
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; BL.ASM |
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; |
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; BOOTLOADER FOR ROMWBW DISK OPERATING SYSTEMS. |
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; |
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; CP/M DISK FORMATS ALLOW FOR RESERVED TRACKS THAT CONTAIN AN IMAGE OF THE |
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; OPERATING SYSTEM TO BE LOADED WHEN THE DISK IS BOOTED. THE OPERATING SYSTEM |
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; IMAGE ITSELF IS NORMALLY PREFIXED BY A 1-N SECTORS CONTAINING OS BOOTSTRAP |
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; CODE AND DISK METADATA. |
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; |
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; THE RETROBREW COMPUTING GROUP HAS BEEN USING A CONVENTION OF PREFIXING THE |
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; OS IMAGE WITH 3 SECTORS (512 BYTES X 3 FOR A TOTAL OF 1536 BYTES): |
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; |
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; SECTOR 1: IBM-PC STYLE BOOT BLOCK CONTAINING BOOTSTRAP, |
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; PARTITION TABLE, AND BOOT SIGNATURE |
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; SECTOR 2: RESERVED |
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; SECTOR 3: METADATA |
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; |
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; THE HARDWARE BIOS IS EXPECTED TO READ AND LOAD THE FIRST TWO SECTORS FROM THE |
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; DISK TO MEMORY ADDRESS $8000 AND JUMP TO THAT LOCATION TO BEGIN THE BOOT |
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; PROCESS. THE BIOS IS EXPECTED TO VERIFY THAT A STANDARD BOOT SIGNATURE |
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; OF $55, $AA IS PRESENT AT OFFSET $1FE-$1FF. IF THE SIGNATURE IS NOT FOUND, |
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; THE BIOS SHOULD ASSUME THE DISK HAS NOT BEEN PROPERLY INITIALIZED AND SHOULD |
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; NOT JUMP TO THE LOAD ADDRESS. |
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; |
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;=============================================================================== |
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; |
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#INCLUDE "ver.inc" |
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; |
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SYS_ENT .EQU $E600 ; SYSTEM (OS) ENTRY POINT ADDRESS |
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SYS_LOC .EQU $D000 ; STARTING ADDRESS TO LOAD SYSTEM IMAGE |
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SYS_END .EQU $FE00 ; ENDING ADDRESS OF SYSTEM IMAGE |
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; |
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BYT .EQU 1 ; used to describe METADATA_SIZE below |
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WRD .EQU 2 |
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; |
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SECTOR_SIZE .EQU 512 |
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BLOCK_SIZE .EQU 128 |
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PREFIX_SIZE .EQU (3 * SECTOR_SIZE) ; 3 SECTORS |
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METADATA_SIZE .EQU BYT+WRD+(4*BYT)+16+BYT+WRD+WRD+WRD+WRD ; (as defined below) |
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; |
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PARTTBL_LOC .EQU $1BE |
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PARTTBL_SIZ .EQU $40 |
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BOOTSIG_LOC .EQU $1FE |
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; |
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;------------------------------------------------------------------------------- |
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; SECTOR 1 |
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; |
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; THIS SECTOR FOLLOWS THE CONVENTIONS OF AN IBM-PC MBR CONTAINING THE OS |
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; BOOTSTRAP CODE, PARTITION TABLE, AND BOOT SIGNATURE |
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; |
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;---------------------------------------------------------------------------- |
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; |
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; THE FOLLOWING BOOTSTRAP CODE IS BUILT TO ASSUME IT WILL BE EXECUTED AT A STARTING |
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; ADDRESS OF $8000. |
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; |
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.ORG $8000 |
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JR BOOT |
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; |
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BOOT: |
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LD DE,STR_LOAD ; LOADING STRING |
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CALL PRTSTR ; PRINT |
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CALL PRTDOT ; PROGRESS |
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; |
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LD BC,$00FC ; UNA FUNC: GET BOOTSTRAP HISTORY |
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CALL $FFFD ; CALL UNA |
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JR NZ,ERROR ; HANDLE ERROR |
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CALL PRTDOT ; PROGRESS |
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LD B,L ; MOVE BOOT UNIT ID TO B |
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; |
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LD C,$41 ; UNA FUNC: SET LBA |
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LD DE,0 ; HI WORD ALWAYS ZERO |
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LD HL,3 ; IMAGE STARTS AT FOURTH SECTOR |
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CALL $FFFD ; SET LBA |
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JR NZ,ERROR ; HANDLE ERROR |
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CALL PRTDOT ; PROGRESS |
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; |
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LD C,$42 ; UNA FUNC: READ SECTORS |
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LD DE,$D000 ; STARTING ADDRESS FOR IMAGE |
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LD L,22 ; READ 22 SECTORS |
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CALL $FFFD ; DO READ |
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JR NZ,ERROR ; HANDLE ERROR |
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CALL PRTDOT ; PROGRESS |
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; |
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LD DE,STR_DONE ; DONE MESSAGE |
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CALL PRTSTR ; PRINT IT |
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; |
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LD D,B ; PASS BOOT UNIT TO OS |
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LD E,0 ; ASSUME LU IS ZERO |
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JP SYS_ENT ; GO TO SYSTEM |
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; |
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PRTCHR: |
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PUSH BC |
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PUSH DE |
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LD BC,$0012 ; UNIT 0, WRITE CHAR |
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LD E,A ; CHAR TO PRINT |
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CALL $FFFD ; PRINT |
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POP DE |
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POP BC |
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RET |
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; |
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PRTSTR: |
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PUSH BC |
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PUSH HL |
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LD BC,$0015 ; UNIT 0, WRITE CHARS UNTIL TERMINATOR |
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LD L,0 ; TERMINATOR IS NULL |
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CALL $FFFD ; PRINT |
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POP HL |
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POP BC |
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RET |
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; |
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PRTDOT: |
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LD A,'.' ; DOT CHARACTER |
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JR PRTCHR ; PRINT AND RETURN |
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; |
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; PRINT THE HEX BYTE VALUE IN A |
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; |
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PRTHEXBYTE: |
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PUSH AF |
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PUSH DE |
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CALL HEXASCII |
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LD A,D |
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CALL PRTCHR |
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LD A,E |
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CALL PRTCHR |
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POP DE |
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POP AF |
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RET |
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; |
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; CONVERT BINARY VALUE IN A TO ASCII HEX CHARACTERS IN DE |
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; |
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HEXASCII: |
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LD D,A |
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CALL HEXCONV |
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LD E,A |
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LD A,D |
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RLCA |
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RLCA |
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RLCA |
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RLCA |
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CALL HEXCONV |
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LD D,A |
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RET |
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; |
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; CONVERT LOW NIBBLE OF A TO ASCII HEX |
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; |
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HEXCONV: |
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AND 0FH ;LOW NIBBLE ONLY |
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ADD A,90H |
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DAA |
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ADC A,40H |
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DAA |
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RET |
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; |
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ERROR: |
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LD DE,STR_ERR ; POINT TO ERROR STRING |
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CALL PRTSTR ; PRINT IT |
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HALT ; HALT |
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; |
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; DATA |
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; |
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STR_LOAD .DB "\r\nLoading",0 |
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STR_DONE .DB "\r\n",0 |
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STR_ERR .DB " Read Error!",0 |
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; |
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.ORG $ - $8000 ; RESTORE ORG |
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.FILL PARTTBL_LOC - $ ; FILL TO START OF PARTITION TABLE |
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; |
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; RESERVE SPACE FOR STANDARD IBM-PC PARTITION TABLE. ALTHOUGH A |
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; PARTITION TABLE IS NOT RELEVANT FOR A FLOPPY DISK, IT DOES NO HARM. |
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; THE CONTENTS OF THE PARTITION TABLE MUST BE MANAGED BY FDISK80. |
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; |
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PARTTBL .FILL PARTTBL_SIZ,$00 ; PARTITION TABLE, FILL WITH ZEROES |
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; |
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; THE END OF THE FIRST SECTOR MUST CONTAIN THE TWO BYTE BOOT |
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; SIGNATURE. |
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; |
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BOOTSIG .DB $55,$AA ; STANDARD BOOT SIGNATURE |
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; |
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;------------------------------------------------------------------------------- |
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; SECTOR 2 |
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; |
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; THIS SECTOR HAS NOT BEEN DEFINED AND IS RESERVED. |
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; |
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;---------------------------------------------------------------------------- |
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; |
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.FILL 512,0 ; JUST FILL SECTOR WITH ZEROES |
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; |
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;------------------------------------------------------------------------------- |
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; SECTOR 3 |
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; |
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; OS AND DISK METADATA |
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; |
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;---------------------------------------------------------------------------- |
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; |
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.FILL 128 * 3,0 ; FIRST 384 BYTES ARE NOT YET DEFINED |
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; |
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; THE FOLLOWING TWO BYTES ARE AN ADDITIONAL SIGNATURE THAT IS VERIFIED BY |
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; SOME HARDWARE BIOSES. |
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; |
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PR_SIG .DB $5A,$A5 ; SIGNATURE GOES HERE |
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; |
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; FIRST CHUNK OF METADATA IMMEDIATELY FOLLOWS THE SIGNATURE BYTES |
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; |
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PR_PLATFORM .DB 0 ; PLATFORM ID (SEE STD.ASM) |
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PR_DEVICE .DB 0 ; ? (PROBABLY UNUSED) |
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PR_FORMATTER .DB 0,0,0,0,0,0,0,0 ; ? (PROBABLY UNUSED) |
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PR_DRIVE .DB 0 ; ? (PROBABLY UNUSED) |
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PR_LOG_UNIT .DW 0 ; ? (PROBABLY UNUSED) |
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; |
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; FILLER TO PLACE SECOND CHUNK OF METADATA AT THE END OF THE SECTOR |
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; |
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.FILL ((PREFIX_SIZE - METADATA_SIZE) - $),00H |
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; |
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; SECOND CHUNK OF METADATA |
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; |
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PR_WP .DB 0 ; WRITE PROTECT BOOLEADN |
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PR_UPDSEQ .DW 0 ; PREFIX UPDATE SEQUENCE NUMBER (DEPRECATED?) |
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PR_VER .DB RMJ,RMN,RUP,RTP ; OS BUILD VERSION |
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PR_LABEL .DB "Unlabeled Drive ","$" ; DISK LABEL (EXACTLY 16 BYTES!!!) |
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.DW 0 ; DEPRECATED |
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PR_LDLOC .DW SYS_LOC ; ADDRESS TO START LOADING SYSTEM |
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PR_LDEND .DW SYS_END ; ADDRESS TO STOP LOADING SYSTEM |
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PR_ENTRY .DW SYS_ENT ; ADDRESS TO ENTER SYSTEM (OS) |
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; |
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; |
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; |
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.END |
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@ -0,0 +1,5 @@ |
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#DEFINE RMJ 2 |
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#DEFINE RMN 9 |
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#DEFINE RUP 2 |
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#DEFINE RTP 0 |
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#DEFINE BIOSVER "2.9.2-pre.28" |
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