188 lines
6.0 KiB
ArmAsm
188 lines
6.0 KiB
ArmAsm
/* $NetBSD: start.s,v 1.5 1995/10/20 13:35:41 ragge Exp $ */
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/*
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* Copyright (c) 1995 Ludd, University of Lule}, Sweden.
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* All rights reserved.
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*
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* This code is derived from software contributed to Ludd by
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* Bertram Barth.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed at Ludd, University of
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* Lule}, Sweden and its contributors.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* All bugs are subject to removal without further notice */
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#define LOCORE
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#include "sys/disklabel.h"
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#undef LOCORE
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#define ASSEMBLER
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#include "../include/mtpr.h"
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#include "../include/asm.h"
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_start: .globl _start # this is the symbolic name for the start
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# of code to be relocated. We can use this
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# to get the actual/real adress (pc-rel)
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# or to get the relocated address (abs).
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.org 0x00 # uVAX booted from TK50 starts here
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brb from_0x00 # continue behind dispatch-block
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.org 0x02 # information used by uVAX-ROM
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.byte (LABELOFFSET + d_end_)/2 # offset in words to identification area
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.byte 1 # this byte must be 1
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.word 0 # logical block number (word swapped)
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.word 0 # of the secondary image
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.org 0x08 #
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brb from_0x08 # skip ...
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.org 0x0A # uVAX booted from disk starts here
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brb from_0x0A # skip ...
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.org 0x0C # 11/750 & 8200 starts here
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brw cont_750
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from_0x00: # uVAX from TK50
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from_0x0A: # uVAX from disk
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brw start_uvax # all(?) uVAXen continue there
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from_0x08: # What comes here???
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halt
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.org LABELOFFSET - 6
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regmask: .word 0x0fff # using a variable saves 3 bytes !!!
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bootinfo: .long 0x0 # another 3 bytes if within byte-offset
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# the complete area reserved for label
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# must be empty (i.e. filled with zeroes).
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# disklabel(8) checks that before installing
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# the bootblocks over existing label.
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/*
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* Parameter block for uVAX boot.
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*/
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#define VOLINFO 0 /* 1=single-sided 81=double-sided volumes */
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#define SISIZE 16 /* size in blocks of secondary image */
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#define SILOAD 0 /* load offset (usually 0) from the default */
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#define SIOFF 0x0A /* byte offset into secondary image */
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.org LABELOFFSET + d_end_
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.byte 0x18 # must be 0x18
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.byte 0x00 # must be 0x00 (MBZ)
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.byte 0x00 # any value
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.byte 0xFF - (0x18 + 0x00 + 0x00)
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/* 4th byte holds 1s' complement of sum of previous 3 bytes */
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.byte 0x00 # must be 0x00 (MBZ)
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.byte VOLINFO
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.byte 0x00 # any value
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.byte 0x00 # any value
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.long SISIZE # size in blocks of secondary image
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.long SILOAD # load offset (usually 0)
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.long SIOFF # byte offset into secondary image
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.long (SISIZE + SILOAD + SIOFF) # sum of previous 3
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/*
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* After bootblock (LBN0) has been loaded into the first page
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* of good memory by 11/750's ROM-code (transfer address
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* of bootblock-code is: base of good memory + 0x0C) registers
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* are initialized as:
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* R0: type of boot-device
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* 0: Massbus device
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* 1: RK06/RK07
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* 2: RL02
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* 17: UDA50
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* 35: TK50
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* 64: TU58
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* R1: (UBA) address of UNIBUS I/O-page
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* (MBA) address of boot device's adapter
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* R2: (UBA) address of the boot device's CSR
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* (MBA) controller number of boot device
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* R6: address of driver subroutine in ROM
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*
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* cont_750 reads in LBN1-15 for further execution.
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*/
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.align 2
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cont_750:
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movl r0,r10
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movl r5, ap # ap not used here
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clrl r5
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clrl r4
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movl $_start,sp
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1: incl r4
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movl r4,r8
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addl2 $0x200,r5
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cmpl $16,r4
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beql 2f
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pushl r5
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jsb (r6)
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blbs r0,1b
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2: movl r10, r0
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movl r11, r5
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brw start_all
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start_uvax:
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mtpr $0, $PR_MAPEN # Turn off MM, please.
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movl $_start, sp
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movl 48(r11), ap
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brb start_all
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/*
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* start_all: stack already at RELOC, we save registers, move ourself
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* to RELOC and loads boot.
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*/
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start_all:
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pushr $0xfff # save all regs, used later.
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subl3 $_start, $_edata, r0 # get size of text+data (w/o bss)
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moval _start, r1 # get actual base-address of code
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subl3 $_start, $_end, r2 # get complete size (incl. bss)
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movl $_start, r3 # get relocated base-address of code
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movc5 r0, (r1), $0, r2, (r3) # copy code to new location
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movl $relocated, -(sp) # return-address on top of stack
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rsb # can be replaced with new address
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relocated: # now relocation is done !!!
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movl sp, _bootregs
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movl ap, _boothowto
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calls $0, _main # call main() which is
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halt # not intended to return ...
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/*
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* hoppabort() is called when jumping to the newly loaded program.
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*/
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ENTRY(hoppabort, 0)
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movl 4(ap),r6
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movl 8(ap),r11
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movl 0xc(ap),r10
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calls $0,(r6)
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halt
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