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Diffstat (limited to 'sys/arch/i386/stand/srt0.S')
| -rw-r--r-- | sys/arch/i386/stand/srt0.S | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/sys/arch/i386/stand/srt0.S b/sys/arch/i386/stand/srt0.S new file mode 100644 index 00000000000..b09415bc2b8 --- /dev/null +++ b/sys/arch/i386/stand/srt0.S @@ -0,0 +1,275 @@ +/* $NetBSD: srt0.c,v 1.3 1994/10/27 04:21:59 cgd Exp $ */ + +/*- + * Copyright (c) 1990 The Regents of the University of California. + * All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * William Jolitz. + * + * 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 by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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. + * + * @(#)srt0.c 5.3 (Berkeley) 4/28/91 + */ + +/* + * Startup code for standalone system + * Non-relocating version -- for programs which are loaded by boot + * Relocating version for boot + * Small relocating version for "micro" boot + */ + + .globl _end + .globl _edata + .globl _boot + .globl __rtt + .globl _exit + .globl _bootdev + .globl _cyloffset +#define NOP inb $0x84,%al ; inb $0x84,%al + +#ifdef SMALL + /* where the disklabel goes if we have one */ + .globl _disklabel +_disklabel: + .space 512 + #.set _scsisn, RELOC+0x60 + #.globl _scsisn +#endif + + .globl entry + .set entry,0 + .globl start + +#if defined(REL) && !defined(SMALL) + + /* relocate program and enter at symbol "start" */ + + #movl $entry-RELOC,%esi # from beginning of ram + movl $0,%esi + #movl $entry,%edi # to relocated area + movl RELOC,%edi # to relocated area + # movl $_edata-RELOC,%ecx # this much + movl $64*1024,%ecx + cld + rep + movsb + # relocate program counter to relocation base + pushl $start + ret +#endif + +start: + + /* setup stack pointer */ + +#ifdef REL + leal 4(%esp),%eax /* ignore old pc */ + movl RELOC-3*4,%ebx + /* copy boot parameters */ + pushl $3*4 + pushl %ebx + pushl %eax + call _bcopy + movl %ebx,%esp +#else + /* save old stack state */ + movl %esp,savearea + movl %ebp,savearea+4 + movl RELOC-0x2400,%esp +#endif + + /* clear memory as needed */ + + movl %esp,%esi +#ifdef REL + + /* + * Clear Bss and up to 64K heap + */ + movl $64*1024,%ebx + movl $_end,%eax # should be movl $_end-_edata but ... + subl $_edata,%eax + #addl %ebx,%eax + pushl %eax + pushl $_edata + call _bzero + + /* + * Clear 64K of stack + */ + movl %esi,%eax + subl %ebx,%eax + subl $5*4,%ebx + pushl %ebx + pushl %eax + call _bzero +#else + movl $_edata,%edx + movl %esp,%eax + subl %edx,%eax + pushl %edx + pushl %esp + call _bzero +#endif + + call _kbdreset /* resets keyboard and gatea20 brain damage */ + movl %esi,%esp + call _boot + jmp 1f + + .data +_bootdev: .long 0 +_cyloffset: .long 0 +savearea: .long 0,0 # sp & bp to return to + .text + .globl _wait + +__rtt: + pushl $1000000 + call _wait + popl %eax + movl $-7,%eax + jmp 1f + +_exit: + pushl $1000000 + call _wait + popl %eax + movl 4(%esp),%eax +1: +#ifdef REL +#ifndef SMALL + call _reset_cpu +#endif + movw $0x1234,%ax + movw %ax,0x472 # warm boot + movl $0,%esp # segment violation + ret +#else + movl savearea,%esp + movl savearea+4,%ebp + ret +#endif + + .globl _inb +_inb: movl 4(%esp),%edx + subl %eax,%eax # clr eax + NOP + inb %dx,%al + ret + + .globl _outb +_outb: movl 4(%esp),%edx + NOP + movl 8(%esp),%eax + outb %al,%dx + ret + + .globl ___udivsi3 +___udivsi3: + movl 4(%esp),%eax + xorl %edx,%edx + divl 8(%esp) + ret + + .globl ___divsi3 +___divsi3: + movl 4(%esp),%eax + xorl %edx,%edx + cltd + idivl 8(%esp) + ret + + # + # bzero (base,cnt) + # + + .globl _bzero +_bzero: + pushl %edi + movl 8(%esp),%edi + movl 12(%esp),%ecx + movb $0x00,%al + cld + rep + stosb + popl %edi + ret + + # + # bcopy (src,dst,cnt) + # NOTE: does not (yet) handle overlapped copies + # + + .globl _bcopy +_bcopy: + pushl %esi + pushl %edi + movl 12(%esp),%esi + movl 16(%esp),%edi + movl 20(%esp),%ecx + cld + rep + movsb + popl %edi + popl %esi + ret + + # insw(port,addr,cnt) + .globl _insw +_insw: + pushl %edi + movw 8(%esp),%dx + movl 12(%esp),%edi + movl 16(%esp),%ecx + NOP + cld + nop + .byte 0x66,0xf2,0x6d # rep insw + nop + movl %edi,%eax + popl %edi + ret + + # outsw(port,addr,cnt) + .globl _outsw +_outsw: + pushl %esi + movw 8(%esp),%dx + movl 12(%esp),%esi + movl 16(%esp),%ecx + NOP + cld + nop + .byte 0x66,0xf2,0x6f # rep outsw + nop + movl %esi,%eax + popl %esi + ret |