Add some amiga code from stage1.S.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@38919 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
François Revol
@@ -30,11 +30,35 @@
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/*
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* references :
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* http://ftp.netbsd.org/pub/NetBSD/NetBSD-release-3-0/src/sys/arch/atari/stand/xxboot/fdboot/fdboot.S
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* http://ftp.netbsd.org/pub/NetBSD/NetBSD-release-4-0/src/sys/arch/amiga/stand/bootblock/
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* http://wandel.ca/homepage/execdis/virus_disassembly.txt
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* http://ciarang.com/wiki/page/Minimal_Amiga_Boot_Code
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*
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*/
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#include "atari_memory_map.h"
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#include "toscalls.h"
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#include "amiga_memory_map.h"
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#include "amicalls.h"
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// AmigaDOS calls
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// exec.library
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#define _FindResident -0x60
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#define _OldOpenLibrary -0x198
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#define _CloseLibrary -0x19e
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// dos.library
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#define Old_mode 1005
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#define New_mode 1006
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#define _Open -0x1e
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#define _Close -0x24
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#define _Read -0x2a
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#define _Write -0x30
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#define _Input -0x36
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#define _Output -0x3c
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#define _IoErr -0x84
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#define _Delay -0xc6
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// intuition.library
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#define _DisplayAlert -90
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// 1 enabled verbose output
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//#define DEBUG 1
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@@ -51,65 +75,77 @@
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//.text
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_bs_entry:
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/* main entry point, both from the floppy boot and .prg */
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bra.s real_entry
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//FAT lookalike to avoid nasty things from happening
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// http://alive.atari.org/alive10/btmania.php
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// MS-DOS values :
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// http://support.microsoft.com/kb/75131/en
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// http://alumnus.caltech.edu/~pje/dosfiles.html
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.ascii "Haiku "
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.byte 0xbe, 0x50, 0x38 // id
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//LITTLE ENDIAN!
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.byte 0x00, 0x02 //BPS
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.byte 0x02 //SPC
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//.byte 0x00 //???
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.byte 0x00, 0x02 //RES - number of reserved sectors
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.byte 0x00 //NFATS
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.byte 0x00, 0x00 //NDIRS
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.byte 0x40, 0x0b //NSECTS
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.byte 0xf0 //MEDIA
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.byte 0x05, 0x00 //SPF
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_fat_spt:
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.byte 0x12, 0x00 //SPT
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.byte 0x02, 0x00 //NSIDES
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.byte 0x00, 0x00 //NHID
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// we're done
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sNumSectors:
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// this location will contain the length of the boot loader as
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// written by the "makeflop" command in 512 byte blocks
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// 0x180 is the allowed maximum, as the zipped TAR with the
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// kernel and the boot module might start at offset 192 kB
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//.word 0x0300 //0x0180
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.word BOOT_ARCHIVE_IMAGE_OFFSET*2
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real_entry:
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// save the regs to return safely, like the NetBSD loader does:
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// http://ftp.netbsd.org/pub/NetBSD/NetBSD-release-3-0/src/sys/arch/atari/stand/xxboot/fdboot/fdboot.S
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movem.l %d1-%d7/%a0-%a6,-(%sp)
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lea str,%a0
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bsr puts
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// first, determine if .prg (user) or bootsect (super)
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// Super()
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move.l #SUP_INQUIRE,-(%sp)
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move.w #0x20,-(%sp)
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trap #GEMDOS_TRAP
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addq.l #6,%sp
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cmp.l #SUP_USER,%d0
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bne floppy_start
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bra prg_start
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// Amiga boot sector
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_floppy_entry:
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.ascii "DOS"
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.byte 0
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_floppy_checksum:
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.long 0
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_floppy_osversion: // ??
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//.long 0x370
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.long 0x09D5A859 // dos private ???
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/*
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* floppy boot support code
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*/
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floppy_start:
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// save some regs just in case
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movem.l %d1-%d7/%a0-%a6,-(%sp)
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// seems like a6 is already set to ExecBase when called from the ROM ?
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// copy it
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move.l 4.w,%a6
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lea _execbase(%pc),%a2
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move.l %a6,(%a2)
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//
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//_continue:
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// lea dosname_boot(%pc),%a1
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// move.l 4.w,%a6 // exec base
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// jsr _FindResident(%a6)
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// lea _dosbase(%pc),%a2
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// tst.l %d0
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// beq.s _floppy_err
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// move.l %d0,(%a2)
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// // pop up saved regs
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// movem.l (%sp)+,%d1-%d7/%a0-%a6
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// move.l _dosbase,%a0
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// move.l 0x16(%a0),%a0
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// moveq #0,%d0
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// rts
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_floppy_err:
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// pop up saved regs
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movem.l (%sp)+,%d1-%d7/%a0-%a6
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moveq #-1,%d0
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rts
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_display_alert:
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move.l 4.w,%a6
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lea intname_boot(%pc),%a1
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jsr _OldOpenLibrary(%a6)
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tst.l %d0
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beq.s _floppy_err
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lea _intbase(%pc),%a2
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move.l %d0,(%a2)
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move.l %d0,%a6
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lea alert_data(%pc),%a0
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moveq #0,%d0
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move.l #30,%d1
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jsr _DisplayAlert(%a6)
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rts
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// ATARI
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#if 0
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lea label_floppy,%a0
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bsr puts
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//bra floppy_start
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@@ -403,6 +439,44 @@ shell_end:
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// this bumps the "start" label to offset 0x0200 as
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// expected by the BFS boot loader, and also marks
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// this block as valid boot block for the BIOS
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#endif
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sNumSectors:
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// this location will contain the length of the boot loader as
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// written by the "makeflop" command in 512 byte blocks
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// 0x180 is the allowed maximum, as the zipped TAR with the
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// kernel and the boot module might start at offset 192 kB
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//.word 0x0300 //0x0180
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.word BOOT_ARCHIVE_IMAGE_OFFSET*2
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dosname_boot:
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.ascii "dos.library"
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.byte 0
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intname_boot:
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.ascii "intuition.library"
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.byte 0
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alert_data:
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.word 10
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.byte 12
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.ascii "Welcome to Haiku\0"
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alert_extra:
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.ascii "\0\0"
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.byte 0
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_execbase:
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.long 0
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_dosbase:
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.long 0
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_intbase:
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.long 0
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end_buff:
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// equ *-_floppy_entry
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.dcb.b (1024)-(end_buff-_floppy_entry),0
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//XXX: put bfs_start here
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