2005-11-21 21:17:58 +00:00
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/*
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*
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2013-09-05 12:39:22 +00:00
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* (c) 2005 Laurent Vivier <Laurent@Vivier.EU>
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2005-11-21 21:17:58 +00:00
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*
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*/
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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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/******************************************************************************
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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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.macro get_second_size register
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lea ioReqCount(%pc),%a0
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move.l (%a0), \register
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.endm
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.macro load_second
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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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.endm
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