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adjust to be more "Utilities disk" like, adjust structures to be easily tunable

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This commit is contained in:
Laurent Vivier 2004-05-21 10:18:49 +00:00
parent e839d9fc1f
commit 2bb05adaad
1 changed files with 53 additions and 25 deletions
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@ -4,7 +4,7 @@
*
*/
.include "config.h"
.include "config.h" /* defines base_address */
.equ drive_num, 1
.equ fsFromStart, 1
@ -30,14 +30,18 @@
.macro pString string
pstring_begin_\@:
.byte pstring_end_\@ - pstring_string_\@
.byte pstring_end_\@ - pstring_string_\@ - 1
pstring_string_\@:
.string "\string"
pstring_end_\@:
.fill 16 - (pstring_end_\@ - pstring_begin_\@) , 1, 0
.endm
/* Structure: "Inside Macintosh: Files", p. 2-57 */
/******************************************************************************
*
* Structure: "Inside Macintosh: Files", p. 2-57
*
*****************************************************************************/
begin:
.short 0x4C4B /* boot blocks signature */
@ -50,31 +54,18 @@ begin:
pString "Distributed " /* debugger filename */
pString "under GNU GPL " /* name of startup screen */
pString "first level " /* name of startup program */
pString "version 1.0 " /* name of system scrap file */
pString "version 1.1 " /* name of system scrap file */
.short 10 /* number of FCBs to allocate */
.short 20 /* number of event queue elements */
.long 0x00004300 /* system heap size on 128K Mac */
.long 0x00000000 /* used internally */
.long 0x00200000 /* system heap size on all machines */
.long 0x00008000 /* used internally */
.long 0x00020000 /* system heap size on all machines */
start:
move.l #base_address, %d0
/* save result in the ParamBlockRec.ioBuffer */
lea ioBuffer,%a0
move.l %d0,(%a0)
/* Now, we load the second stage loader */
lea param_block,%a0
PBReadSync
/* call second stage bootloader */
move.l ioBuffer,%a0
jmp (%a0)
/******************************************************************************
*
* param block used to load second stage
*
*****************************************************************************/
param_block:
.long 0 /* qLink : next queue entry */
@ -98,5 +89,42 @@ ioReqCount: /* ioReqCount : requested number of bytes */
ioPosOffset: /* ioPosOffset : positionning offset */
.long first_level_size
/******************************************************************************
*
* start : load the second stage
*
* start is called from the boot block header
*
* call PBReadSync() to read blocks from floppy
* as described in param_block
*
*****************************************************************************/
start:
move.l #base_address, %d0
/* save result in the ParamBlockRec.ioBuffer */
lea ioBuffer,%a0
move.l %d0,(%a0)
/* Now, we load the second stage loader */
lea param_block,%a0
PBReadSync
/* call second stage bootloader */
move.l ioBuffer,%a0
jmp (%a0)
end:
.fill 1024 - (end - begin), 1, 0xda
/******************************************************************************
*
* Filler: the boot block is 2 floppy blocks
* as seen on the disk of utilities of MacOS 7.6, we fill with 0xda
*
*****************************************************************************/
.fill first_level_size - (end - begin), 1, 0xda