/* * Copyright 2004-2005, Axel Dörfler, axeld@pinc-software.de. All rights reserved. * Copyright 2005, Ingo Weinhold, bonefish@users.sf.net. * Copyright 2007, Haiku, Inc. All Rights Reserved. * Distributed under the terms of the MIT license. * * Author: * François Revol, revol@free.fr. */ /** This file contains the boot floppy and BFS boot block entry points for * the stage 2 boot loader. * x86 ahead: * The floppy entry point is at offset 0. It's loaded at 0x07c0:0x000. It * will load the rest of the loader to 0x1000:0x0200 and execute it. * The BFS boot block will load the whole stage 2 loader to 0x1000:0x0000 * and will then jump to 0x1000:0x0200 as its entry point. * This code will then switch to protected mode and will directly call * the entry function of the embedded ELF part of the loader. */ /* * generate boot floppy: * cd src/system/boot/platform/atari_m68k/ ; make fixup_tos_floppy_chksum; cd - * dd if=generated/objects/haiku/m68k/release/system/boot/haiku_loader of=~/floppy.img bs=512 count=20 conv=notrunc * src/system/boot/platform/atari_m68k/fixup_tos_floppy_chksum ~/floppy.img * generate .prg: * generated.m68k/cross-tools/bin/m68k-unknown-haiku-ld -o haiku.prg -T src/system/ldscripts/m68k/boot_prg_atari_m68k.ld generated/objects/haiku/m68k/release/system/boot/boot_loader_atari_m68k */ /* * references : * http://ftp.netbsd.org/pub/NetBSD/NetBSD-release-4-0/src/sys/arch/amiga/stand/bootblock/ * http://wandel.ca/homepage/execdis/virus_disassembly.txt * http://ciarang.com/wiki/page/Minimal_Amiga_Boot_Code * */ #include "amiga_memory_map.h" #include "rom_calls.h" // 1 enabled verbose output //#define DEBUG 1 #define GLOBAL(x) .globl x ; x #define FUNCTION(x) .global x; .type x,@function; x #define DRIVE_RETRIES 3 // when the drive reading fails for some reason, it will // retry this many times until it will report a failure #define SECTSIZE 512 // .text _bs_entry: // Amiga boot sector _floppy_entry: .ascii "DOS" .byte 0 _floppy_checksum: .long 0 _floppy_osversion: // ?? //.long 0x370 .long 0x09D5A859 // dos private ??? /* * floppy boot support code */ floppy_start: // save some regs just in case movem.l %d1-%d7/%a0-%a6,-(%sp) // save the provided IOReq pointer lea sBootIOReq(%pc),%a2 move.l %a1,(%a2) // seems like a6 is already set to ExecBase when called from the ROM ? move.l 4.w,%a6 // exec base //jsr _LVOFindResident(%a6) lea SysBase(%pc),%a2 move.l %a6,(%a2) // lea dosname_boot(%pc),%a1 // move.l 4.w,%a6 // exec base // jsr _LVOFindResident(%a6) // lea DosBase(%pc),%a2 // tst.l %d0 // beq.s _floppy_err // move.l %d0,(%a2) // needed to display alerts lea intname_boot(%pc),%a1 jsr _LVOOldOpenLibrary(%a6) tst.l %d0 beq _floppy_err lea IntuitionBase(%pc),%a2 move.l %d0,(%a2) // allocate absolute memory to put the stack & bootloader at, // just to make sure AmigaOS won't write there. move.l #(AMIGA_ZBEOS_STACK_END-AMIGA_ZBEOS_STACK_BASE+AMIGA_ZBEOS_MAX),%d0 move.l #AMIGA_ZBEOS_STACK_BASE,%a1 jsr _LVOAllocAbs(%a6) tst.l %d0 beq.s _floppy_err_alert //lea alert_extra(%pc),%a2 //addq.b #1,(%a2) move.l #0xdeadbeef,%d0 bsr putx // copy haiku_loader to AMIGA_ZBEOS_BASE lea sBootIOReq,%a1 move.l (%a1),%a1 move #CMD_READ,28(%a1) //io_Command //move.l #0x200,%d0 //XXX //mulu sNumSectors,%d0 //move.l %d0,36(%a1) //io_Length move.l #0x200,36(%a1) //io_Length move.l #AMIGA_ZBEOS_BASE,40(%a1) //io_Data move.l #0,44(%a1) //io_Offset move.w sNumSectors,%d2 next_sector: move.w %d2,%d0 bsr putx move.l %a1,-(%sp) jsr _LVODoIO(%a6) move.l (%sp)+,%a1 tst.l %d0 bne _floppy_err_alert add.l #0x200,40(%a1) //io_Data add.l #0x200,44(%a1) //io_Offset //subq.w #1,sNumSectors subq.w #1,%d2 bne next_sector move.l #0xf100f100,%d0 bsr putx //lea alert_extra(%pc),%a2 //move.b #'F',(%a2) // move.l // cmp.l 32(%a1),36(%a1) // blt.s _floppy_err_alert //lea alert_extra(%pc),%a2 //addq.b #1,(%a2) bra.s floppy_done //_continue: // lea dosname_boot(%pc),%a1 // move.l 4.w,%a6 // exec base // jsr _LVOFindResident(%a6) // lea _dosbase(%pc),%a2 // tst.l %d0 // beq.s _floppy_err // move.l %d0,(%a2) // // pop up saved regs // movem.l (%sp)+,%d1-%d7/%a0-%a6 // move.l _dosbase,%a0 // move.l 0x16(%a0),%a0 // moveq #0,%d0 // rts GLOBAL(_floppy_err_alert): lea IntuitionBase(%pc),%a6 move.l (%a6),%a6 lea alert_data(%pc),%a0 moveq #0,%d0 move.l #30,%d1 jsr _LVODisplayAlert(%a6) _floppy_err: // pop up saved regs movem.l (%sp)+,%d1-%d7/%a0-%a6 moveq #-1,%d0 rts floppy_done: // setup stack move.l #AMIGA_ZBEOS_STACK_END,%sp //jmp AMIGA_ZBEOS_BASE+512 //move.w TOSVAR_bootdev,%d0 // XXX: use uint16 ?? //move.b %d0,AMIGA_ZBEOS_BASE + gBootDriveID - _bs_entry move.b #1,AMIGA_ZBEOS_BASE + gBootedFromImage - _bs_entry // XXX: copy the rest ! move.b #'S',AMIGA_ZBEOS_BASE + alert_extra - _bs_entry // Copy open library handles move.l SysBase(%pc),AMIGA_ZBEOS_BASE + SysBase - _bs_entry move.l IntuitionBase(%pc),AMIGA_ZBEOS_BASE + IntuitionBase - _bs_entry move.l #0,%d0 // jump to C++ code jmp _start putx: movem.l %d0-%d2/%a0-%a2,-(%sp) lea alert_extra(%pc),%a2 move.l #8-1,%d2 move.l %d0,%d1 putxloop: move.l %d1,%d0 lsl.l #4,%d1 //swap %d0 //lsr.l #8,%d0 //lsr.l #4,%d0 rol.l #4,%d0 and.l #0x0f,%d0 cmp.b #9,%d0 ble putx0 add.b #'a'-'0'-10,%d0 //bra putxdisp putx0: add.b #'0',%d0 putxdisp: move.b %d0,(%a2)+ dbf %d2,putxloop // bsr putcrlf movem.l (%sp)+,%d0-%d2/%a0-%a2 rts // ATARI #if 0 floppy_end: // .org FAILURE_STRING failure_string: // .string " Loading failed! Press key to reboot.\r\n" .string " Loading failed! Press key.\r\n" // .string "FAIL" // .org DOT_STRING // .string "." str: .string "Haiku!" msg_j1: .string "Jumping to haiku_loader." #endif sNumSectors: // this location will contain the length of the boot loader as // written by the "makeflop" command in 512 byte blocks // 0x180 is the allowed maximum, as the zipped TAR with the // kernel and the boot module might start at offset 192 kB //.word 0x0300 //0x0180 .word BOOT_ARCHIVE_IMAGE_OFFSET*2 sBootIOReq: .long 0 dosname_boot: .ascii "dos.library" .byte 0 intname_boot: .ascii "intuition.library" .byte 0 alert_data: .word 10 .byte 12 .ascii "Error loading Haiku: " alert_extra: .ascii "XXXXXXXX\0" .byte 0 GLOBAL(SysBase): .long 0 GLOBAL(DosBase): .long 0 GLOBAL(IntuitionBase): .long 0 end_buff: // equ *-_floppy_entry .dcb.b (1024)-(end_buff-_floppy_entry),0 //XXX: put bfs_start here /* * \AUTO\HAIKU.PRG and ARAnyM BOOTSTRAP() support code */ #if 0 super_done: // XXX: copy the rest ! move.b #AMIGA_BOOT_DRVAPI_FLOPPY,AMIGA_ZBEOS_BASE + gBootDriveAPI - _bs_entry move.b #0,AMIGA_ZBEOS_BASE + gBootDriveID - _bs_entry move.b #1,AMIGA_ZBEOS_BASE + gBootedFromImage - _bs_entry move.l #0,%d0 #endif //jmp AMIGA_ZBEOS_BASE+512 jmp _start saved_super_stack: .long 0 GLOBAL(gBootedFromImage): .byte 0 GLOBAL(gBootDriveID): .byte 0 GLOBAL(gBootPartitionOffset): .long 0
