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https://github.com/vivier/EMILE.git
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116 lines
2.8 KiB
ArmAsm
116 lines
2.8 KiB
ArmAsm
/*
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*
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* (c) 2004,2005 Laurent Vivier <Laurent@Vivier.EU>
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*
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*/
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.cpu 68000
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.equ sector_size, 512
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.equ first_level_size, 2 * sector_size
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.include "macos.i"
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.include "32bitmode.i"
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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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.include "scsi.i"
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.else
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.include "floppy.i"
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.endif
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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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moveal SysZone,%a0
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addal %pc@(SysHeapSize),%a0
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SetApplBase
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movel SysZone,TheZone
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/* test if we are in 32bit mode, otherwise reboot in 32bit mode */
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switch32bitmode
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/* buffer size to store second stage booter */
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get_second_size %d0
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/* Allocate Memory for second stage loader */
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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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/* load second stage */
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load_second
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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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