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https://github.com/vivier/EMILE.git
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351 lines
7.2 KiB
ArmAsm
351 lines
7.2 KiB
ArmAsm
/*
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*
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* (c) 2004 Laurent Vivier <LaurentVivier@wanadoo.fr>
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*
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*/
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.equ sector_size, 512
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.equ first_level_size, 2 * sector_size
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.ifdef SCSI_SUPPORT
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/* SCSI constants */
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.equ _SCSIGet, 0x0001
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.equ _SCSISelect, 0x0002
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.equ _SCSICmd, 0x0003
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.equ _SCSIComplete, 0x0004
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.equ _SCSIRead, 0x0005
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.equ COMPLETION_TIMEOUT, 300
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/* SCSI macros */
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.macro SCSIDispatch selector
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move.w #\selector, -(%sp)
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dc.w 0xA815 /* _SCSIDispatch */
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move.w (%sp)+, %d0
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.endm
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.else /* SCSI_SUPPORT */
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/* floppy constants */
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.equ drive_num, 1
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.equ fsFromStart, 1
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.equ sectors_per_track, 18
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.equ sides, 2
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.equ track_size, sector_size * sectors_per_track
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.equ track_number, 80
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.equ floppy_size, sides * track_size * track_number
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.equ second_level_size, floppy_size - first_level_size
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/* floppy macros */
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.macro PBReadSync
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.short 0xA002
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.endm
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.endif /* SCSI_SUPPORT */
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.equ ROMBase, 0x2ae
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.macro StripAddress
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.short 0xA055
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.endm
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.macro ReadXPRam
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.short 0xA051
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.endm
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.macro WriteXPRam
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.short 0xA052
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.endm
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.macro NewPtr
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.short 0xA11E
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.endm
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.macro SysError
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.short 0xA9C9
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.endm
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/* Pascal string : length, string */
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.macro pString string
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pstring_begin_\@:
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.byte pstring_end_\@ - pstring_string_\@ - 1
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pstring_string_\@:
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.string "\string"
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pstring_end_\@:
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.fill 16 - (pstring_end_\@ - pstring_begin_\@) , 1, 0
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.endm
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/******************************************************************************
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*
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* Structure: "Inside Macintosh: Files", p. 2-57
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*
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*****************************************************************************/
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begin:
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ID: .short 0x4C4B /* boot blocks signature */
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Entry: bra start /* entry point to bootcode */
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Version: .short 0x4418 /* boot blocks version number */
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PageFlags: .short 0x00 /* used internally */
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SysName: pString "Mac Bootloader" /* System filename */
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ShellName: pstring "Copyright 2004" /* Finder filename */
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Dbg1Name: pString "Laurent Vivier" /* debugger filename */
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Dbg2Name: pString "Distributed " /* debugger filename */
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ScreenName: pString "under GNU GPL " /* name of startup screen */
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HelloName: pString "first level " /* name of startup program */
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ScrapName: pString "version 1.2 " /* name of system scrap file */
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CntFCBs: .short 10 /* number of FCBs to allocate */
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CntEvts: .short 20 /* number of event queue elements */
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Heap128K: .long 0x00004300 /* system heap size on 128K Mac */
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Heap256K: .long 0x00008000 /* used internally */
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SysHeapSize: .long 0x00020000 /* system heap size on all machines */
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.ifdef SCSI_SUPPORT
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.equ READ_10, 0x28
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.equ CDB_offset, 2
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.equ CDB_nb_blocks, 7
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.align 4
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CDB:
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.byte READ_10
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.byte 0
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.long 0 /* offset to read, big-endian, like m68k */
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.byte 0
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.short 0 /* number of blocks to read, big-endian */
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.byte 0
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.equ op_inc, 1
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.equ op_no_inc, 2
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.equ op_stop, 7
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.equ TIB_buffer, 2
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.equ TIB_size, 6
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.align 4
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TIB:
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.short op_inc
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.long 0
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.long 0
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.short op_stop
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.long 0
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.long 0
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/* SCSI complete result */
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stat: .short 0
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message: .short 0
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.else /* SCSI_SUPPORT */
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/******************************************************************************
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*
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* param block used to load second stage from floppy
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*
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*****************************************************************************/
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param_block:
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.long 0 /* qLink : next queue entry */
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.short 0 /* qType : queue type */
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.short 0 /* ioTrap : routine trap */
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.long 0 /* ioCmdAddr: routine address */
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.long 0 /* ioCompletion : pointer to completion routine */
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.short 0 /* ioResult : result code */
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.long 0 /* ioNamePtr : pointer to pathname */
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.short drive_num /* ioVRefNum : volume specification */
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.short -5 /* ioRefNum: file reference number */
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.byte 0 /* ioVersNum : version number */
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.byte 0 /* ioPermssn : read/write permission */
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.long 0 /* ioMisc : miscellaneaous */
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ioBuffer: /* ioBuffer : data buffer */
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.long 0
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ioReqCount: /* ioReqCount : requested number of bytes */
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.long second_level_size
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.long 0 /* ioActCount : actual number of bytes */
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.short fsFromStart /* ioPosMode : positioning mode and newline char */
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ioPosOffset: /* ioPosOffset : positionning offset */
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.long first_level_size
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.endif /* SCSI_SUPPORT */
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/******************************************************************************
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*
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* start : load the second stage
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*
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* start is called from the boot block header
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*
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* call PBReadSync() to read blocks from floppy
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* as described in param_block
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*
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*****************************************************************************/
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.align 4
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start:
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movea.l ROMBase,%a0
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move.w 8(%a0), %d1 /* read ROM id */
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cmp.w #0x0178, %d1 /* only 24bit ROM */
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bls.S bit32_ok
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/* test if we are in 32bit mode */
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move.l #-1, %d0
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StripAddress
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cmp.l #-1, %d0
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beq.S bit32_ok
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/* Switch to 32bit mode */
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lea PRAM_buffer(%pc), %a0 /* where to store data */
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move.w #1, %d0 /* size of data */
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swap %d0
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move.w #0x08A, %d0 /* offset in PRAM */
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ReadXPRam
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lea PRAM_buffer(%pc), %a0
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or.b #0x05, (%a0)
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move.w #1, %d0 /* size of data */
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swap %d0
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move.w #0x08A, %d0 /* offset in PRAM */
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WriteXPRam
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/* jump to reset function in ROM */
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movea.l ROMBase,%a0
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jmp 0x90(%a0)
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bit32_ok:
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/* Allocate Memory for second stage loader */
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.ifdef SCSI_SUPPORT
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/* buffer size to store second level booter */
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move.l second_size(%pc), %d0
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.else
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lea ioReqCount(%pc),%a0
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move.l (%a0), %d0
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.endif
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add.l #4, %d0
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NewPtr
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move.l %a0, %d0
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bne malloc_ok
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move.l #1, %d0
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SysError
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malloc_ok:
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add.l #3, %d0
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and.l #0xFFFFFFFC.l, %d0
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.ifdef SCSI_SUPPORT
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lea container_end(%pc), %a6
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lea TIB(%pc), %a0 /* TIB */
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move.l %d0, TIB_buffer(%a0)
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lea PRAM_buffer(%pc), %a0
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move.l %d0, (%a0)
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scsi_loop:
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/* prepare CDB */
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lea CDB(%pc), %a0
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move.w -(%a6), %d2
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beq exit_scsi
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move.w %d2, CDB_nb_blocks(%a0)
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move.l -(%a6), CDB_offset(%a0)
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/* compute # of bytes to transfer = block size * # of blocks */
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move.w block_size(%pc), %d1
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mulu %d2, %d1
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/* prepare TIB */
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lea TIB(%pc), %a0 /* TIB */
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move.l %d1, TIB_size(%a0)
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/* SCSI sequence */
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/* SCSIGet */
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clr.w -(%sp)
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SCSIDispatch(_SCSIGet)
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/* SCSISelect */
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clr.w -(%sp)
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move.w #0, -(%sp)
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SCSIDispatch(_SCSISelect)
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/* SCSICmd */
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clr.w -(%sp)
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pea CDB(%pc)
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move.w #10, -(%sp)
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SCSIDispatch(_SCSICmd)
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/* SCSIRead */
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clr.w -(%sp)
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pea TIB(%pc)
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SCSIDispatch(_SCSIRead)
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/* SCSIComplete */
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clr.w -(%sp)
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pea stat(%pc)
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pea message(%pc)
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move.l #COMPLETION_TIMEOUT, -(%sp)
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SCSIDispatch(_SCSIComplete)
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bra scsi_loop
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exit_scsi:
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lea PRAM_buffer(%pc), %a0
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move.l (%a0), %a0
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.else
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/* save result in the ParamBlockRec.ioBuffer */
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lea ioBuffer(%pc),%a0
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move.l %d0,(%a0)
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/* Now, we load the second stage loader */
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lea param_block(%pc),%a0
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PBReadSync
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tst.l %d0
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beq read_ok
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move.l #2, %d0
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SysError
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read_ok:
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move.l ioBuffer(%pc),%a0
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.endif /* SCSI_SUPPORT */
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/* call second stage bootloader */
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jmp (%a0)
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PRAM_buffer:
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.long 0
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end:
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/******************************************************************************
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*
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* Filler: the boot block is 2 floppy blocks
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* as seen on the disk of utilities of MacOS 7.6, we fill with 0xda
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*
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*****************************************************************************/
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.ifdef SCSI_SUPPORT
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.fill first_level_size - (end - begin) - 10, 1, 0xda
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container_end:
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block_size: .short 0
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unit_id: .short 0
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second_size: .long 0
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max_blocks: .short container_end - end
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.else
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.fill first_level_size - (end - begin), 1, 0xda
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.endif
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