EMILE/first/floppy.i

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/*
*
* (c) 2005 Laurent Vivier <Laurent@Vivier.EU>
*
*/
/* floppy constants */
.equ drive_num, 1
.equ fsFromStart, 1
.equ sectors_per_track, 18
.equ sides, 2
.equ track_size, sector_size * sectors_per_track
.equ track_number, 80
.equ floppy_size, sides * track_size * track_number
.equ second_level_size, floppy_size - first_level_size
/* floppy macros */
.macro PBReadSync
.short 0xA002
.endm
/******************************************************************************
*
* param block used to load second stage from floppy
*
*****************************************************************************/
param_block:
.long 0 /* qLink : next queue entry */
.short 0 /* qType : queue type */
.short 0 /* ioTrap : routine trap */
.long 0 /* ioCmdAddr: routine address */
.long 0 /* ioCompletion : pointer to completion routine */
.short 0 /* ioResult : result code */
.long 0 /* ioNamePtr : pointer to pathname */
.short drive_num /* ioVRefNum : volume specification */
.short -5 /* ioRefNum: file reference number */
.byte 0 /* ioVersNum : version number */
.byte 0 /* ioPermssn : read/write permission */
.long 0 /* ioMisc : miscellaneaous */
ioBuffer: /* ioBuffer : data buffer */
.long 0
ioReqCount: /* ioReqCount : requested number of bytes */
.long second_level_size
.long 0 /* ioActCount : actual number of bytes */
.short fsFromStart /* ioPosMode : positioning mode and newline char */
ioPosOffset: /* ioPosOffset : positionning offset */
.long first_level_size
.macro get_second_size register
lea ioReqCount(%pc),%a0
move.l (%a0), \register
.endm
.macro load_second
/* save result in the ParamBlockRec.ioBuffer */
lea ioBuffer(%pc),%a0
move.l %d0,(%a0)
/* Now, we load the second stage loader */
lea param_block(%pc),%a0
PBReadSync
tst.l %d0
beq read_ok
move.l #2, %d0
SysError
read_ok:
move.l ioBuffer(%pc),%a0
.endm