[i386] Kill off obsolete boot1a.s file

src/arch/i386/prefix/boot1a.s

@@ -1,410 +0,0 @@
-# This code is no longer used in Etherboot.  It is not maintained and
-# may not work.
-
-
-#
-# Copyright (c) 1998 Robert Nordier
-# All rights reserved.
-# Very small bootrom changes by Luigi Rizzo
-# <comment author="Luigi Rizzo">
-# I recently had the problem of downloading the etherboot code
-# from a hard disk partition instead of a floppy, and noticed that
-# floppyload.S does not do the job. With a bit of hacking to
-# the FreeBSD's boot1.s code, I managed to obtain a boot sector
-# which works both for floppies and hard disks -- basically you
-# do something like
-# 
-# 	cat boot1a bin32/<yourcard>.lzrom > /dev/ad0s4
-# 
-# (or whatever is the HD partition you are using, I am using slice
-# 4 on FreeBSD) and you are up and running.
-# Then with "fdisk" you have to mark your partition as having type "1"
-# (which is listed as DOS-- but basically it must be something matching
-# the variable PRT_BSD in the assembly source below).
-# </comment>
-#
-# Redistribution and use in source and binary forms are freely
-# permitted provided that the above copyright notice and this
-# paragraph and the following disclaimer are duplicated in all
-# such forms.
-#
-# This software is provided "AS IS" and without any express or
-# implied warranties, including, without limitation, the implied
-# warranties of merchantability and fitness for a particular
-# purpose.
-#
-# Makefile:
-#boot1a: boot1a.out
-#	objcopy -S -O binary boot1a.out boot1a
-#
-#boot1a.out: boot1a.o
-#	ld -nostdlib -static -N -e start -Ttext 0x7c00 -o boot1a.out boot1a.o
-#
-#boot1a.o: boot1a.s
-#	as --defsym FLAGS=0x80 boot1a.s -o boot1a.o
-#
-#
-
-# $FreeBSD: src/sys/boot/i386/boot2/boot1.s,v 1.10.2.2 2000/07/07 21:12:32 jhb Exp $
-
-# Memory Locations
-		.set MEM_REL,0x700		# Relocation address
-		.set MEM_ARG,0x900		# Arguments
-		.set MEM_ORG,0x7c00		# Origin
-		.set MEM_BUF,0x8c00		# Load area
-		.set MEM_BTX,0x9000		# BTX start
-		.set MEM_JMP,0x9010		# BTX entry point
-		.set MEM_USR,0xa000		# Client start
-		.set BDA_BOOT,0x472		# Boot howto flag
-	
-# Partition Constants 
-		.set PRT_OFF,0x1be		# Partition offset
-		.set PRT_NUM,0x4		# Partitions
-		.set PRT_BSD,0x1		# Partition type
-
-# Flag Bits
-		.set FL_PACKET,0x80		# Packet mode
-
-# Misc. Constants
-		.set SIZ_PAG,0x1000		# Page size
-		.set SIZ_SEC,0x200		# Sector size
-
-		.globl start
-		.globl xread
-		.code16
-
-start:		jmp main			# Start recognizably
-
-		.org 0x4,0x90
-# 
-# Trampoline used by boot2 to call read to read data from the disk via
-# the BIOS.  Call with:
-#
-# %cx:%ax	- long    - LBA to read in
-# %es:(%bx)	- caddr_t - buffer to read data into
-# %dl		- byte    - drive to read from
-# %dh		- byte    - num sectors to read
-# 
-
-xread:		push %ss			# Address
-		pop %ds				#  data
-#
-# Setup an EDD disk packet and pass it to read
-# 
-xread.1:					# Starting
-		pushl $0x0			#  absolute
-		push %cx			#  block
-		push %ax			#  number
-		push %es			# Address of
-		push %bx			#  transfer buffer
-		xor %ax,%ax			# Number of
-		movb %dh,%al			#  blocks to
-		push %ax			#  transfer
-		push $0x10			# Size of packet
-		mov %sp,%bp			# Packet pointer
-		callw read			# Read from disk
-		lea 0x10(%bp),%sp		# Clear stack
-		lret				# To far caller
-# 
-# Load the rest of boot2 and BTX up, copy the parts to the right locations,
-# and start it all up.
-#
-
-#
-# Setup the segment registers to flat addressing (segment 0) and setup the
-# stack to end just below the start of our code.
-# 
-main:		cld				# String ops inc
-		xor %cx,%cx			# Zero
-		mov %cx,%es			# Address
-		mov %cx,%ds			#  data
-		mov %cx,%ss			# Set up
-		mov $start,%sp			#  stack
-#
-# Relocate ourself to MEM_REL.  Since %cx == 0, the inc %ch sets
-# %cx == 0x100.
-# 
-		mov %sp,%si			# Source
-		mov $MEM_REL,%di		# Destination
-		incb %ch			# Word count
-		rep				# Copy
-		movsw				#  code
-#
-# If we are on a hard drive, then load the MBR and look for the first
-# FreeBSD slice.  We use the fake partition entry below that points to
-# the MBR when we call nread.  The first pass looks for the first active
-# FreeBSD slice.  The second pass looks for the first non-active FreeBSD
-# slice if the first one fails.
-# 
-		mov $part4,%si			# Partition
-		cmpb $0x80,%dl			# Hard drive?
-		jb main.4			# No
-		movb $0x1,%dh			# Block count
-		callw nread			# Read MBR
-		mov $0x1,%cx	 		# Two passes
-main.1: 	mov $MEM_BUF+PRT_OFF,%si	# Partition table
-		movb $0x1,%dh			# Partition
-main.2: 	cmpb $PRT_BSD,0x4(%si)		# Our partition type?
-		jne main.3			# No
-		jcxz main.5			# If second pass
-		testb $0x80,(%si)		# Active?
-		jnz main.5			# Yes
-main.3: 	add $0x10,%si	 		# Next entry
-		incb %dh			# Partition
-		cmpb $0x1+PRT_NUM,%dh		# In table?
-		jb main.2			# Yes
-		dec %cx				# Do two
-		jcxz main.1			#  passes
-#
-# If we get here, we didn't find any FreeBSD slices at all, so print an
-# error message and die.
-# 
-booterror:	mov $msg_part,%si		# Message
-		jmp error			# Error
-#
-# Floppies use partition 0 of drive 0.
-# 
-main.4: 	xor %dx,%dx			# Partition:drive
-#
-# Ok, we have a slice and drive in %dx now, so use that to locate and load
-# boot2.  %si references the start of the slice we are looking for, so go
-# ahead and load up the first 16 sectors (boot1 + boot2) from that.  When
-# we read it in, we conveniently use 0x8c00 as our transfer buffer.  Thus,
-# boot1 ends up at 0x8c00, and boot2 starts at 0x8c00 + 0x200 = 0x8e00.
-# The first part of boot2 is the disklabel, which is 0x200 bytes long.
-# The second part is BTX, which is thus loaded into 0x9000, which is where
-# it also runs from.  The boot2.bin binary starts right after the end of
-# BTX, so we have to figure out where the start of it is and then move the
-# binary to 0xb000.  Normally, BTX clients start at MEM_USR, or 0xa000, but
-# when we use btxld create boot2, we use an entry point of 0x1000.  That
-# entry point is relative to MEM_USR; thus boot2.bin starts at 0xb000.
-# 
-main.5:		mov %dx,MEM_ARG			# Save args
-		movb $0x2,%dh			# Sector count
-		mov $0x7e00, %bx
-		callw nreadbx			# Read disk
-		movb $0x40,%dh			# Sector count
-		movb %dh, %al
-		callw puthex
-		mov $0x7e00, %bx
-		callw nreadbx			# Read disk
-		push %si
-		mov $msg_r1,%si
-		callw putstr
-		pop %si
-		lcall $0x800,$0			# enter the rom code
-		int $0x19
-
-msg_r1:		.asciz " done\r\n"
-		
-.if 0
-		mov $MEM_BTX,%bx		# BTX
-		mov 0xa(%bx),%si		# Get BTX length and set
-		add %bx,%si			#  %si to start of boot2.bin
-		mov $MEM_USR+SIZ_PAG,%di	# Client page 1
-		mov $MEM_BTX+0xe*SIZ_SEC,%cx	# Byte
-		sub %si,%cx			#  count
-		rep				# Relocate
-		movsb				#  client
-		sub %di,%cx			# Byte count
-		xorb %al,%al			# Zero assumed bss from
-		rep				#  the end of boot2.bin
-		stosb				#  up to 0x10000
-		callw seta20			# Enable A20
-		jmp start+MEM_JMP-MEM_ORG	# Start BTX
-# 
-# Enable A20 so we can access memory above 1 meg.
-# 
-seta20: 	cli				# Disable interrupts
-seta20.1:	inb $0x64,%al			# Get status
-		testb $0x2,%al			# Busy?
-		jnz seta20.1			# Yes
-		movb $0xd1,%al			# Command: Write
-		outb %al,$0x64			#  output port
-seta20.2:	inb $0x64,%al			# Get status
-		testb $0x2,%al			# Busy?
-		jnz seta20.2			# Yes
-		movb $0xdf,%al			# Enable
-		outb %al,$0x60			#  A20
-		sti				# Enable interrupts
-		retw				# To caller
-.endif
-# 
-# Trampoline used to call read from within boot1.
-# 
-nread:		mov $MEM_BUF,%bx		# Transfer buffer
-nreadbx:					# same but address is in bx
-		mov 0x8(%si),%ax		# Get
-		mov 0xa(%si),%cx		#  LBA
-		push %bx
-		push %ax
-		callw putword
-		pop %ax
-		pop %bx
-		push %cs			# Read from
-		callw xread.1	 		#  disk
-		jnc return			# If success, return
-		mov $msg_read,%si		# Otherwise, set the error
-						#  message and fall through to
-						#  the error routine
-# 
-# Print out the error message pointed to by %ds:(%si) followed
-# by a prompt, wait for a keypress, and then reboot the machine.
-# 
-error:		callw putstr			# Display message
-		mov $prompt,%si			# Display
-		callw putstr			#  prompt
-		xorb %ah,%ah			# BIOS: Get
-		int $0x16			#  keypress
-		movw $0x1234, BDA_BOOT		# Do a warm boot
-		ljmp $0xffff,$0x0		# reboot the machine
-# 
-# Display a null-terminated string using the BIOS output.
-# 
-putstr.0:	call putchar
-putstr: 	lodsb				# Get char
-		testb %al,%al			# End of string?
-		jne putstr.0			# No
-		retw
-
-putword:	push %ax
-		movb $'.', %al
-		callw putchar
-		movb %ah, %al
-		callw puthex
-		pop %ax
-puthex:		push %ax
-		shr $4, %al
-		callw putdigit
-		pop %ax
-putdigit:
-		andb $0xf, %al
-		addb $0x30, %al
-		cmpb $0x39, %al
-		jbe putchar
-		addb $7, %al
-putchar:	push %ax
-		mov $0x7,%bx
-		movb $0xe,%ah
-		int $0x10
-		pop %ax
-		retw
-
-#
-# Overused return code.  ereturn is used to return an error from the
-# read function.  Since we assume putstr succeeds, we (ab)use the
-# same code when we return from putstr. 
-# 
-ereturn:	movb $0x1,%ah			# Invalid
-		stc				#  argument
-return: 	retw				# To caller
-# 
-# Reads sectors from the disk.  If EDD is enabled, then check if it is
-# installed and use it if it is.  If it is not installed or not enabled, then
-# fall back to using CHS.  Since we use a LBA, if we are using CHS, we have to
-# fetch the drive parameters from the BIOS and divide it out ourselves.
-# Call with:
-#
-# %dl	- byte     - drive number
-# stack - 10 bytes - EDD Packet
-#
-read:	 	push %dx			# Save
-		movb $0x8,%ah			# BIOS: Get drive
-		int $0x13			#  parameters
-		movb %dh,%ch			# Max head number
-		pop %dx				# Restore
-		jc return			# If error
-		andb $0x3f,%cl			# Sectors per track
-		jz ereturn			# If zero
-		cli				# Disable interrupts
-		mov 0x8(%bp),%eax		# Get LBA
-		push %dx			# Save
-		movzbl %cl,%ebx			# Divide by
-		xor %edx,%edx			#  sectors
-		div %ebx			#  per track
-		movb %ch,%bl			# Max head number
-		movb %dl,%ch			# Sector number
-		inc %bx				# Divide by
-		xorb %dl,%dl			#  number
-		div %ebx			#  of heads
-		movb %dl,%bh			# Head number
-		pop %dx				# Restore
-		cmpl $0x3ff,%eax		# Cylinder number supportable?
-		sti				# Enable interrupts
-		ja read.7			# No, try EDD
-		xchgb %al,%ah			# Set up cylinder
-		rorb $0x2,%al			#  number
-		orb %ch,%al			# Merge
-		inc %ax				#  sector
-		xchg %ax,%cx	 		#  number
-		movb %bh,%dh			# Head number
-		subb %ah,%al			# Sectors this track
-		mov 0x2(%bp),%ah		# Blocks to read
-		cmpb %ah,%al			# To read
-		jb read.2			#  this
-		movb %ah,%al			#  track
-read.2: 	mov $0x5,%di	 		# Try count
-read.3: 	les 0x4(%bp),%bx		# Transfer buffer
-		push %ax			# Save
-		movb $0x2,%ah			# BIOS: Read
-		int $0x13			#  from disk
-		pop %bx				# Restore
-		jnc read.4			# If success
-		dec %di				# Retry?
-		jz read.6			# No
-		xorb %ah,%ah			# BIOS: Reset
-		int $0x13			#  disk system
-		xchg %bx,%ax	 		# Block count
-		jmp read.3			# Continue
-read.4: 	movzbw %bl,%ax	 		# Sectors read
-		add %ax,0x8(%bp)		# Adjust
-		jnc read.5			#  LBA,
-		incw 0xa(%bp)	 		#  transfer
-read.5: 	shlb %bl			#  buffer
-		add %bl,0x5(%bp)		#  pointer,
-		sub %al,0x2(%bp)		#  block count
-		ja read				# If not done
-read.6: 	retw				# To caller
-read.7:		testb $FL_PACKET,%cs:MEM_REL+flags-start # LBA support enabled?
-		jz ereturn			# No, so return an error
-		mov $0x55aa,%bx			# Magic
-		push %dx			# Save
-		movb $0x41,%ah			# BIOS: Check
-		int $0x13			#  extensions present
-		pop %dx				# Restore
-		jc return			# If error, return an error
-		cmp $0xaa55,%bx			# Magic?
-		jne ereturn			# No, so return an error
-		testb $0x1,%cl			# Packet interface?
-		jz ereturn			# No, so return an error
-		mov %bp,%si			# Disk packet
-		movb $0x42,%ah			# BIOS: Extended
-		int $0x13			#  read
-		retw				# To caller
-
-# Messages
-
-msg_read:	.asciz "Rd"
-msg_part:	.asciz "Boot"
-
-prompt: 	.asciz " err\r\n"
-
-flags:		.byte FLAGS			# Flags
-
-		.org PRT_OFF,0x90
-
-# Partition table
-
-		.fill 0x30,0x1,0x0
-part4:		.byte 0x80
-		.byte 0x00	# start head
-		.byte 0x01	# start sector (6 bits) + start cyl (2 bit)
-		.byte 0x00	# start cyl (low 8 bits)
-		.byte 0x1	# part.type
-		.byte 0xff	# end head
-		.byte 0xff	# end sect (6) + end_cyl(2)
-		.byte 0xff	# end cyl
-		.byte 0x00, 0x00, 0x00, 0x00	# explicit start
-		.byte 0x50, 0xc3, 0x00, 0x00	# 50000 sectors long, bleh
-
-		.word 0xaa55			# Magic number