diff options
Diffstat (limited to 'sys/arch/vax/stand/xxboot/start.s')
| -rw-r--r-- | sys/arch/vax/stand/xxboot/start.s | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/sys/arch/vax/stand/xxboot/start.s b/sys/arch/vax/stand/xxboot/start.s new file mode 100644 index 00000000000..d20753cf901 --- /dev/null +++ b/sys/arch/vax/stand/xxboot/start.s @@ -0,0 +1,200 @@ +/* $OpenBSD: start.s,v 1.1 2000/04/27 02:26:27 bjc Exp $ */ +/* $NetBSD: start.s,v 1.2 1999/10/23 14:40:38 ragge Exp $ */ +/* + * Copyright (c) 1995 Ludd, University of Lule}, Sweden. + * All rights reserved. + * + * This code is derived from software contributed to Ludd by + * Bertram Barth. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed at Ludd, University of + * Lule}, Sweden and its contributors. + * 4. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + + /* All bugs are subject to removal without further notice */ + + +#define _LOCORE + +#include "sys/disklabel.h" + +#include "../include/mtpr.h" +#include "../include/asm.h" + +_start: .globl _start # this is the symbolic name for the start + # of code to be relocated. We can use this + # to get the actual/real adress (pc-rel) + # or to get the relocated address (abs). + +.org 0x00 # uVAX booted from TK50 starts here + brb from_0x00 # continue behind dispatch-block + +.org 0x02 # information used by uVAX-ROM + .byte (LABELOFFSET + d_end_)/2 # offset in words to identification area + .byte 1 # this byte must be 1 + .word 0 # logical block number (word swapped) + .word 0 # of the secondary image + +.org 0x08 # + brb from_0x08 # skip ... + +.org 0x0A # uVAX booted from disk starts here + brb from_0x0A # skip ... + +.org 0x0C # 11/750 & 8200 starts here + brw cont_750 + + +from_0x00: # uVAX from TK50 +from_0x0A: # uVAX from disk + brw start_uvax # all(?) uVAXen continue there + +from_0x08: # What comes here??? + halt + +.org LABELOFFSET - 6 +regmask: .word 0x0fff # using a variable saves 3 bytes !!! +bootinfo: .long 0x0 # another 3 bytes if within byte-offset + +# the complete area reserved for label +# must be empty (i.e. filled with zeroes). +# disklabel(8) checks that before installing +# the bootblocks over existing label. + +/* + * Parameter block for uVAX boot. + */ +#define VOLINFO 0 /* 1=single-sided 81=double-sided volumes */ +#define SISIZE 16 /* size in blocks of secondary image */ +#define SILOAD 0 /* load offset (usually 0) from the default */ +#define SIOFF 0x0A /* byte offset into secondary image */ + +.org LABELOFFSET + d_end_ + .byte 0x18 # must be 0x18 + .byte 0x00 # must be 0x00 (MBZ) + .byte 0x00 # any value + .byte 0xFF - (0x18 + 0x00 + 0x00) + /* 4th byte holds 1s' complement of sum of previous 3 bytes */ + + .byte 0x00 # must be 0x00 (MBZ) + .byte VOLINFO + .byte 0x00 # any value + .byte 0x00 # any value + + .long SISIZE # size in blocks of secondary image + .long SILOAD # load offset (usually 0) + .long SIOFF # byte offset into secondary image + .long (SISIZE + SILOAD + SIOFF) # sum of previous 3 + +/* + * After bootblock (LBN0) has been loaded into the first page + * of good memory by 11/750's ROM-code (transfer address + * of bootblock-code is: base of good memory + 0x0C) registers + * are initialized as: + * R0: type of boot-device + * 0: Massbus device + * 1: RK06/RK07 + * 2: RL02 + * 17: UDA50 + * 35: TK50 + * 64: TU58 + * R1: (UBA) address of UNIBUS I/O-page + * (MBA) address of boot device's adapter + * R2: (UBA) address of the boot device's CSR + * (MBA) controller number of boot device + * R6: address of driver subroutine in ROM + * + * cont_750 reads in LBN1-15 for further execution. + */ + .align 2 +cont_750: + movl r0,r10 + movl r5, ap # ap not used here + clrl r5 + clrl r4 + movl $_start,sp +1: incl r4 + movl r4,r8 + addl2 $0x200,r5 + cmpl $16,r4 + beql 2f + pushl r5 + jsb (r6) + blbs r0,1b +2: movl r10, r0 + movl r11, r5 + brw start_all + + +start_uvax: + mtpr $0, $PR_MAPEN # Turn off MM, please. + movl $_start, sp + movl 48(r11), ap + brb start_all + +/* + * start_all: stack already at RELOC, we save registers, move ourself + * to RELOC and loads boot. + */ +start_all: + pushr $0xfff # save all regs, used later. + + subl3 $_start, $_edata, r0 # get size of text+data (w/o bss) + moval _start, r1 # get actual base-address of code + subl3 $_start, $_end, r2 # get complete size (incl. bss) + movl $_start, r3 # get relocated base-address of code + movc5 r0, (r1), $0, r2, (r3) # copy code to new location + + movl $relocated, -(sp) # return-address on top of stack + rsb # can be replaced with new address +relocated: # now relocation is done !!! + movl sp, _bootregs + movl ap, _boothowto + calls $0, _Xmain # call Xmain (gcc workaround)which is + halt # not intended to return ... + +/* + * hoppabort() is called when jumping to the newly loaded program. + */ +ENTRY(hoppabort, 0) + movl 4(ap),r6 + movl 8(ap),r11 + movl 0xc(ap),r10 + movl _memsz, r8 + mnegl $1, ap # Hack to figure out boot device. + jmp 2(r6) +# calls $0,(r6) + halt + +# A bunch of functions unwanted in boot blocks. +ENTRY(getchar, 0) + halt + +ENTRY(putchar, 0) + ret + +ENTRY(panic, 0) + halt |