1994-10-27 07:14:23 +03:00
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/* $NetBSD: fdbootblk.c,v 1.6 1994/10/27 04:21:53 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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* @(#)fdbootblk.c 7.2 (Berkeley) 5/4/91
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1993-03-21 12:45:37 +03:00
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*/
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/*
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* fdbootblk.s:
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* Written 10/6/90 by William F. Jolitz
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* Initial block boot for AT/386 with typical stupid NEC controller
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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 "/sys/i386/isa/isa.h"
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#include "/sys/i386/isa/fdreg.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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/* mumbo-jumbo to pacify DOS, in the hope of getting diskcopy to work */
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jmp 1f
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1993-04-28 09:38:44 +04:00
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.asciz "NetBSD "
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1993-03-21 12:45:37 +03:00
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.byte 1 # sectors per allocation
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.word 15 # additional sectors for bootstrap
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.word 0 # number of DOS fat sectors
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.word 0 # number of DOS rootdir entries
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.byte 0xf0 # media descriptor
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.word 0 # number of sectors per a DOS fat entry
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.word 18 # number of sectors per track
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.word 2 # number of heads
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.long 0 # number of hidden sectors
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.long 2880-18 # logical sectors per volume
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.byte 0 # physical drive
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.byte 0x29 # ?
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.long 137 # binary id
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.ascii "Release 0.1" # volume label
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.space 5
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1:
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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 0x2E,0x0F,1,0x16 /* word aword cs lgdt GDTptr */
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.word BIOSRELOC+0xa4 #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+0xb3 /* 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+0x8c # GDT -- arrgh, gas again!
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readcmd: .byte 0xe6,0,0,0,0,2,18,0x1b,0xff
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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 $ RELOC+0x200, %edi
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xorl %ebx, %ebx
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incb %bl # shl $1,%bl
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incb %bl
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movb $0x20,%al # do a eoi
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outb %al,$0x20
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NOP
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1993-03-21 21:04:42 +03:00
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movb $0xbf,%al # enable floppy interrupt, mask out rest
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1993-03-21 12:45:37 +03:00
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outb %al,$0x21
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NOP
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8:
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movb %bl,readcmd+4
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movl %edi,%ecx
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/* Set read/write bytes */
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xorl %edx,%edx
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1993-03-21 21:04:42 +03:00
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movb $0x0c,%dl # outb(0xC,junk); outb(0xB,0x46);
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outb %al,%dx # reset DMA controller first/last flip-flop
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1993-03-21 12:45:37 +03:00
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NOP
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decb %dx
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1993-03-21 21:04:42 +03:00
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movb $0x46,%al # single mode, write mem, chan 2
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outb %al,%dx # output DMA controller mode byte
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1993-03-21 12:45:37 +03:00
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/* Send start address */
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movb $0x04,%dl # outb(0x4, addr);
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movb %cl,%al
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outb %al,%dx
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NOP
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movb %ch,%al # outb(0x4, addr>>8);
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outb %al,%dx
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NOP
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rorl $8,%ecx # outb(0x81, addr>>16);
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movb %ch,%al
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outb %al,$0x81
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NOP
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/* Send count */
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movb $0x05,%dl # outb(0x5, 0);
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xorl %eax,%eax
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outb %al,%dx
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NOP
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movb $2,%al # outb(0x5,2);
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outb %al,%dx
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NOP
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/* set channel 2 */
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movb $2,%al # outb(0x0A,2);
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outb %al,$0x0A
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NOP
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/* issue read command to fdc */
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movw $0x3f4,%dx
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movl $readcmd,%esi
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xorl %ecx,%ecx
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movb $9,%cl
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2: NOP
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inb %dx,%al
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testb $0x80,%al
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jz 2b
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incb %dx
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NOP
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movl (%esi),%al
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outb %al,%dx
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NOP
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incl %esi
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decb %dx
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loop 2b
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/* watch the icu looking for an interrupt signalling completion */
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xorl %edx,%edx
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movb $0x20,%dl
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2:
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NOP
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movb $0xc,%al
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outb %al,%dx
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NOP
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inb %dx,%al
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andb $0x7f,%al
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cmpb $6,%al
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jne 2b
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NOP
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movb $0x20,%al # do a eoi
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outb %al,%dx
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NOP
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movl $0x3f4,%edx
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xorl %ecx,%ecx
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movb $7,%cl
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2:
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NOP
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inb %dx,%al
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andb $0xC0,%al
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cmpb $0xc0,%al
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jne 2b
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incb %dx
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inb %dx,%al
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decb %dx
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loop 2b
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/* extract the status bytes after the read. must we do this? */
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addw $0x200,%edi # next addr to load to
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incb %bl
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cmpb $15,%bl
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jle 8b
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/* for clever bootstrap, dig out boot unit and cylinder */
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pushl $0
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pushl $0
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/* fd controller is major device 2 */
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pushl $2 /* dev */
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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, off) */
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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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