1994-10-27 07:14:23 +03:00
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/* $NetBSD: wdbootblk.c,v 1.3 1994/10/27 04:22:02 cgd Exp $ */
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1993-03-21 12:45:37 +03:00
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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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 by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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1994-10-27 07:14:23 +03:00
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* @(#)wdbootblk.c 7.1 (Berkeley) 4/28/91
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1993-03-21 12:45:37 +03:00
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*/
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/*
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* wdbootblk.s:
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* Written 7/6/90 by William F. Jolitz
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* Initial block boot for AT/386 with typical Western Digital
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* WD 1002-WA2 (or upwards compatable). Works either as
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* first and sole partition bootstrap, or as loaded by a
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* earlier BIOS boot when on an inner partition of the disk.
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*
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* Goal is to read in sucessive 7.5Kbytes of bootstrap to
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* execute.
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*
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* No attempt is made to handle disk errors.
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*/
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#include "i386/isa/isa.h"
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#include "i386/isa/wdreg.h"
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#define NOP inb $0x84,%al
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#define BIOSRELOC 0x7c00
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#define start RELOC+0x400
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/* step 0 force descriptors to bottom of address space */
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cli
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.byte 0xb8,0x30,0x00 /* mov $0x30,%ax */
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mov %ax, %ss
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.byte 0xbc,0x00,0x01 /* mov $0x100,%sp */
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xorl %eax,%eax
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movl %ax,%ds
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movl %ax,%es
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/* obtain BIOS parameters for hard disk XXX */
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movb $0x9f,%ah /* write to 0x9ff00 XXX */
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movb $0xf0,%al
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mov %ax,%es
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xor %edi,%edi
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.byte 0xf, 0xb4, 0x36 ; .word 0x41*4 /* lfs 0x41*4, %si */
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xorb %ch,%ch
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movb $0x10,%cl
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fs
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rep
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movsb
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.byte 0xf, 0xb4, 0x36 ; .word 0x46*4 /* lfs 0x46*4, %si */
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xorb %ch,%ch
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movb $0x10,%cl
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fs
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rep
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movsb
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xorl %eax,%eax
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movl %ax,%es
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/* step 1 load new descriptor table */
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.byte 0x3E,0x0F,1,0x16
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.word BIOSRELOC+0x6e #GDTptr
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# word aword cs lgdt GDTptr
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/* step 2 turn on protected mode */
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smsw %ax
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orb $1,%al
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lmsw %ax
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jmp 1f
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nop
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/* step 3 reload segment descriptors */
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1:
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xorl %eax,%eax
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movb $0x10,%al
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movl %ax,%ds
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movl %ax,%es
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movl %ax,%ss
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word
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ljmp $0x8,$ BIOSRELOC+0x74 /* would be nice if .-RELOC+0x7c00 worked */
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/* Global Descriptor Table contains three descriptors:
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* 0x00: Null: not used
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* 0x08: Code: code segment starts at 0 and extents for 4 gigabytes
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* 0x10: Data: data segment starts at 0 and extends for 4 gigabytes
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* (overlays code)
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*/
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GDT:
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NullDesc: .word 0,0,0,0 # null descriptor - not used
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CodeDesc: .word 0xFFFF # limit at maximum: (bits 15:0)
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.byte 0,0,0 # base at 0: (bits 23:0)
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.byte 0x9f # present/priv level 0/code/conforming/readable
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.byte 0xcf # page granular/default 32-bit/limit(bits 19:16)
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.byte 0 # base at 0: (bits 31:24)
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DataDesc: .word 0xFFFF # limit at maximum: (bits 15:0)
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.byte 0,0,0 # base at 0: (bits 23:0)
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.byte 0x93 # present/priv level 0/data/expand-up/writeable
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.byte 0xcf # page granular/default 32-bit/limit(bits 19:16)
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.byte 0 # base at 0: (bits 31:24)
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/* Global Descriptor Table pointer
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* contains 6-byte pointer information for LGDT
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*/
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GDTptr: .word 0x17 # limit to three 8 byte selectors(null,code,data)
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.long BIOSRELOC+0x56 # GDT -- arrgh, gas again!
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/* step 4 relocate to final bootstrap address. */
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reloc:
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movl $ BIOSRELOC,%esi
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movl $ RELOC,%edi
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movl $512,%ecx
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rep
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movsb
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movl $0xa0000, %esp
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pushl $dodisk
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ret
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/* step 5 load remaining 15 sectors off disk */
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dodisk:
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movl $ IO_WD1+wd_seccnt,%edx
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movb $ 15,%al
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outb %al,%dx
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NOP
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movl $ IO_WD1+wd_sector,%edx
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movb $ 2,%al
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outb %al,%dx
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NOP
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#outb(wdc+wd_cyl_lo, (cyloffset & 0xff));
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#outb(wdc+wd_cyl_hi, (cyloffset >> 8));
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#outb(wdc+wd_sdh, WDSD_IBM | (unit << 4));
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movl $ IO_WD1+wd_command,%edx
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movb $ WDCC_READ,%al
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outb %al,%dx
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NOP
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cld
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/* check to make sure controller is not busy and we have data ready */
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readblk:
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movl $ IO_WD1+wd_status,%edx
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NOP
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inb %dx,%al
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testb $ WDCS_BUSY,%al
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jnz readblk
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testb $ WDCS_DRQ,%al
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jz readblk
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/* read a block into final position in memory */
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movl $ IO_WD1+wd_data,%edx
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movl $ 256,%ecx
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.byte 0x66,0xf2,0x6d # rep insw
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NOP
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/* need more blocks to be read in? */
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cmpl $ RELOC+16*512-1,%edi
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jl readblk
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/* for clever bootstrap, dig out boot unit and cylinder */
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movl $ IO_WD1+wd_cyl_lo,%edx
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inb %dx,%al
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xorl %ecx,%ecx
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movb %al,%cl
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incl %edx
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NOP
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inb %dx,%al /* cyl_hi */
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movb %al,%ch
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pushl %ecx /* cyloffset */
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incl %edx
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xorl %eax,%eax
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NOP
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inb %dx,%al /* sdh */
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andb $0x10,%al /* isolate unit # bit */
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shrb $4,%al
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pushl %eax /* unit */
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/* wd controller is major device 0 */
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xorl %eax,%eax
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pushl %eax /* bootdev */
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/* sorry, no flags at this point! */
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movl $ start, %eax
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call %eax /* main (dev, unit, offset) */
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ebootblkcode:
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/* remaining space usable for a disk label */
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.org 0x1fe
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.word 0xaa55 /* signature -- used by BIOS ROM */
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ebootblk: /* MUST BE EXACTLY 0x200 BIG FOR SURE */
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