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more or less take traps/interrupts

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rtm 2006-06-13 15:50:06 +00:00
parent 70a895f63c
commit 0a70d042d0
7 changed files with 791 additions and 70 deletions
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5
Makefile
View file

@ -1,4 +1,4 @@
OBJS = main.o console.o string.o kalloc.o proc.o trapasm.o
OBJS = main.o console.o string.o kalloc.o proc.o trapasm.o trap.o vectors.o
CC = i386-jos-elf-gcc
LD = i386-jos-elf-ld
@ -23,5 +23,8 @@ kernel : $(OBJS)
$(LD) -Ttext 0x100000 -e main -o kernel $(OBJS)
$(OBJDUMP) -S kernel > kernel.asm
vectors.S : vectors.pl
perl vectors.pl > vectors.S
clean :
rm -f *.o bootblock kernel kernel.asm xv6.img

8
Notes
View file

@ -65,3 +65,11 @@ perhaps have fixed-size stack, put it in the data segment?
oops, if kernel stack is in contiguous user phys mem, then moving
users' memory (e.g. to expand it) will wreck any pointers into the
kernel stack.
do we need to set fs and gs? so user processes can't abuse them?
setupsegs() may modify current segment table, is that legal?
trap() ought to lgdt on return, since currently only done in swtch()
protect hardware interrupt vectors from user INT instructions?

782
dot-bochsrc
View file

@ -1,79 +1,737 @@
###############################################################
# bochsrc file for pragmalinux disk image.
# You may now use double quotes around pathnames, in case
# your pathname includes spaces.
#=======================================================================
# CONFIG_INTERFACE
#
# This file is provided both as .bochsrc and bochsrc so
# that it works on win32 and unix.
###############################################################
# how much memory the emulated machine will have
megs: 32
# filename of ROM images
romimage: file=/usr/local/BIOS-bochs-latest, address=0xf0000
vgaromimage: file=/usr/local/VGABIOS-lgpl-latest
# Use the parallel port as an alternate console,
# so that we can run Bochs without the GUI.
parport1: enabled=1, file="/dev/stdout"
#parport1: enabled=1, file="/dev/null"
# uncommenting one of the following lines can be used to specify your
# preferred display. (defaults to x11 for bochs-bin and to term for
# bochs-term)
# The configuration interface is a series of menus or dialog boxes that
# allows you to change all the settings that control Bochs's behavior.
# There are two choices of configuration interface: a text mode version
# called "textconfig" and a graphical version called "wx". The text
# mode version uses stdin/stdout and is always compiled in. The graphical
# version is only available when you use "--with-wx" on the configure
# command. If you do not write a config_interface line, Bochs will
# choose a default for you.
#
# NOTE: if you use the "wx" configuration interface, you must also use
# the "wx" display library.
#=======================================================================
#config_interface: textconfig
#config_interface: wx
#=======================================================================
# DISPLAY_LIBRARY
#
# The display library is the code that displays the Bochs VGA screen. Bochs
# has a selection of about 10 different display library implementations for
# different platforms. If you run configure with multiple --with-* options,
# the display_library command lets you choose which one you want to run with.
# If you do not write a display_library line, Bochs will choose a default for
# you.
#
# The choices are:
# x use X windows interface, cross platform
# win32 use native win32 libraries
# carbon use Carbon library (for MacOS X)
# beos use native BeOS libraries
# macintosh use MacOS pre-10
# amigaos use native AmigaOS libraries
# sdl use SDL library, cross platform
# svga use SVGALIB library for Linux, allows graphics without X11
# term text only, uses curses/ncurses library, cross platform
# rfb provides an interface to AT&T's VNC viewer, cross platform
# wx use wxWidgets library, cross platform
# nogui no display at all
#
# NOTE: if you use the "wx" configuration interface, you must also use
# the "wx" display library.
#
# Specific options:
# Some display libraries now support specific option to control their
# behaviour. See the examples below for currently supported options.
#=======================================================================
#display_library: amigaos
#display_library: beos
#display_library: carbon
#display_library: macintosh
#display_library: nogui
#display_library: rfb, options="timeout=60" # time to wait for client
#display_library: sdl, options="fullscreen" # startup in fullscreen mode
#display_library: term
#display_library: win32, options="legacyF12" # use F12 to toggle mouse
#display_library: wx
#display_library: x
# nogui can still be useful because you can see the output on the
# parport1 from above
#display_library: nogui
#=======================================================================
# ROMIMAGE:
# The ROM BIOS controls what the PC does when it first powers on.
# Normally, you can use a precompiled BIOS in the source or binary
# distribution called BIOS-bochs-latest. The ROM BIOS is usually loaded
# starting at address 0xf0000, and it is exactly 64k long.
# You can also use the environment variable $BXSHARE to specify the
# location of the BIOS.
# The usage of external large BIOS images (up to 512k) at memory top is
# now supported, but we still recommend to use the BIOS distributed with
# Bochs. Now the start address can be calculated from image size.
#=======================================================================
romimage: file=$BXSHARE/BIOS-bochs-latest, address=0xf0000
#romimage: file=mybios.bin, address=0xfff80000 # 512k at memory top
#romimage: file=mybios.bin # calculate start address from image size
# if using "term", you probably want to change the parport output to
# go to a file or /dev/null
#display_library: term
#=======================================================================
# CPU:
# This defines cpu-related parameters inside Bochs:
#
# COUNT:
# Set the number of processors when Bochs is compiled for SMP emulation.
# Bochs currently supports up to 8 processors. If Bochs is compiled
# without SMP support, it won't accept values different from 1.
#
# IPS:
# Emulated Instructions Per Second. This is the number of IPS that bochs
# is capable of running on your machine. You can recompile Bochs with
# --enable-show-ips option enabled, to find your workstation's capability.
# Measured IPS value will then be logged into your log file or status bar
# (if supported by the gui).
#
# IPS is used to calibrate many time-dependent events within the bochs
# simulation. For example, changing IPS affects the frequency of VGA
# updates, the duration of time before a key starts to autorepeat, and
# the measurement of BogoMips and other benchmarks.
#
# Examples:
# Machine Mips
# ________________________________________________________________
# 2.1Ghz Athlon XP with Linux 2.6/g++ 3.4 12 to 15 Mips
# 1.6Ghz Intel P4 with Win2000/g++ 3.3 5 to 7 Mips
# 650Mhz Athlon K-7 with Linux 2.4.4/egcs-2.91.66 2 to 2.5 Mips
# 400Mhz Pentium II with Linux 2.0.36/egcs-1.0.3 1 to 1.8 Mips
#=======================================================================
cpu: count=1, ips=10000000
# disk images
#=======================================================================
# MEGS
# Set the number of Megabytes of physical memory you want to emulate.
# The default is 32MB, most OS's won't need more than that.
# The maximum amount of memory supported is 2048Mb.
#=======================================================================
#megs: 256
#megs: 128
#megs: 64
megs: 32
#megs: 16
#megs: 8
#=======================================================================
# OPTROMIMAGE[1-4]:
# You may now load up to 4 optional ROM images. Be sure to use a
# read-only area, typically between C8000 and EFFFF. These optional
# ROM images should not overwrite the rombios (located at
# F0000-FFFFF) and the videobios (located at C0000-C7FFF).
# Those ROM images will be initialized by the bios if they contain
# the right signature (0x55AA) and a valid checksum.
# It can also be a convenient way to upload some arbitrary code/data
# in the simulation, that can be retrieved by the boot loader
#=======================================================================
#optromimage1: file=optionalrom.bin, address=0xd0000
#optromimage2: file=optionalrom.bin, address=0xd1000
#optromimage3: file=optionalrom.bin, address=0xd2000
#optromimage4: file=optionalrom.bin, address=0xd3000
#optramimage1: file=/path/file1.img, address=0x0010000
#optramimage2: file=/path/file2.img, address=0x0020000
#optramimage3: file=/path/file3.img, address=0x0030000
#optramimage4: file=/path/file4.img, address=0x0040000
#=======================================================================
# VGAROMIMAGE
# You now need to load a VGA ROM BIOS into C0000.
#=======================================================================
#vgaromimage: file=bios/VGABIOS-elpin-2.40
vgaromimage: file=$BXSHARE/VGABIOS-lgpl-latest
#vgaromimage: file=bios/VGABIOS-lgpl-latest-cirrus
#=======================================================================
# VGA:
# Here you can specify the display extension to be used. With the value
# 'none' you can use standard VGA with no extension. Other supported
# values are 'vbe' for Bochs VBE and 'cirrus' for Cirrus SVGA support.
#=======================================================================
#vga: extension=cirrus
#vga: extension=vbe
vga: extension=none
#=======================================================================
# FLOPPYA:
# Point this to pathname of floppy image file or device
# This should be of a bootable floppy(image/device) if you're
# booting from 'a' (or 'floppy').
#
# You can set the initial status of the media to 'ejected' or 'inserted'.
# floppya: 2_88=path, status=ejected (2.88M 3.5" floppy)
# floppya: 1_44=path, status=inserted (1.44M 3.5" floppy)
# floppya: 1_2=path, status=ejected (1.2M 5.25" floppy)
# floppya: 720k=path, status=inserted (720K 3.5" floppy)
# floppya: 360k=path, status=inserted (360K 5.25" floppy)
# floppya: 320k=path, status=inserted (320K 5.25" floppy)
# floppya: 180k=path, status=inserted (180K 5.25" floppy)
# floppya: 160k=path, status=inserted (160K 5.25" floppy)
# floppya: image=path, status=inserted (guess type from image size)
#
# The path should be the name of a disk image file. On Unix, you can use a raw
# device name such as /dev/fd0 on Linux. On win32 platforms, use drive letters
# such as a: or b: as the path. The parameter 'image' works with image files
# only. In that case the size must match one of the supported types.
#=======================================================================
floppya: 1_44=/dev/fd0, status=inserted
#floppya: image=../1.44, status=inserted
#floppya: 1_44=/dev/fd0H1440, status=inserted
#floppya: 1_2=../1_2, status=inserted
#floppya: 1_44=a:, status=inserted
#floppya: 1_44=a.img, status=inserted
#floppya: 1_44=/dev/rfd0a, status=inserted
#=======================================================================
# FLOPPYB:
# See FLOPPYA above for syntax
#=======================================================================
#floppyb: 1_44=b:, status=inserted
floppyb: 1_44=b.img, status=inserted
#=======================================================================
# ATA0, ATA1, ATA2, ATA3
# ATA controller for hard disks and cdroms
#
# ata[0-3]: enabled=[0|1], ioaddr1=addr, ioaddr2=addr, irq=number
#
# These options enables up to 4 ata channels. For each channel
# the two base io addresses and the irq must be specified.
#
# ata0 and ata1 are enabled by default with the values shown below
#
# Examples:
# ata0: enabled=1, ioaddr1=0x1f0, ioaddr2=0x3f0, irq=14
# ata1: enabled=1, ioaddr1=0x170, ioaddr2=0x370, irq=15
# ata2: enabled=1, ioaddr1=0x1e8, ioaddr2=0x3e0, irq=11
# ata3: enabled=1, ioaddr1=0x168, ioaddr2=0x360, irq=9
#=======================================================================
ata0: enabled=1, ioaddr1=0x1f0, ioaddr2=0x3f0, irq=14
# ata0-master: type=disk, mode=flat, path="./obj/kern/bochs.img", cylinders=200, heads=16, spt=63
ata0-master: type=disk, mode=flat, path="./xv6.img", cylinders=100, heads=10, spt=10
# ata0-slave: type=disk, mode=flat, path="./obj/fs/fs.img", cylinders=200, heads=16, spt=63
ata1: enabled=1, ioaddr1=0x170, ioaddr2=0x370, irq=15
ata2: enabled=0, ioaddr1=0x1e8, ioaddr2=0x3e0, irq=11
ata3: enabled=0, ioaddr1=0x168, ioaddr2=0x360, irq=9
# choose the boot disk.
boot: c
#=======================================================================
# ATA[0-3]-MASTER, ATA[0-3]-SLAVE
#
# This defines the type and characteristics of all attached ata devices:
# type= type of attached device [disk|cdrom]
# mode= only valid for disks [flat|concat|external|dll|sparse|vmware3]
# mode= only valid for disks [undoable|growing|volatile]
# path= path of the image
# cylinders= only valid for disks
# heads= only valid for disks
# spt= only valid for disks
# status= only valid for cdroms [inserted|ejected]
# biosdetect= type of biosdetection [none|auto], only for disks on ata0 [cmos]
# translation=type of translation of the bios, only for disks [none|lba|large|rechs|auto]
# model= string returned by identify device command
# journal= optional filename of the redolog for undoable and volatile disks
#
# Point this at a hard disk image file, cdrom iso file, or physical cdrom
# device. To create a hard disk image, try running bximage. It will help you
# choose the size and then suggest a line that works with it.
#
# In UNIX it may be possible to use a raw device as a Bochs hard disk,
# but WE DON'T RECOMMEND IT. In Windows there is no easy way.
#
# In windows, the drive letter + colon notation should be used for cdroms.
# Depending on versions of windows and drivers, you may only be able to
# access the "first" cdrom in the system. On MacOSX, use path="drive"
# to access the physical drive.
#
# The path is always mandatory. For flat hard disk images created with
# bximage geometry autodetection can be used (cylinders=0 -> cylinders are
# calculated using heads=16 and spt=63). For other hard disk images and modes
# the cylinders, heads, and spt are mandatory.
#
# Default values are:
# mode=flat, biosdetect=auto, translation=auto, model="Generic 1234"
#
# The biosdetect option has currently no effect on the bios
#
# Examples:
# ata0-master: type=disk, mode=flat, path=10M.sample, cylinders=306, heads=4, spt=17
# ata0-slave: type=disk, mode=flat, path=20M.sample, cylinders=615, heads=4, spt=17
# ata1-master: type=disk, mode=flat, path=30M.sample, cylinders=615, heads=6, spt=17
# ata1-slave: type=disk, mode=flat, path=46M.sample, cylinders=940, heads=6, spt=17
# ata2-master: type=disk, mode=flat, path=62M.sample, cylinders=940, heads=8, spt=17
# ata2-slave: type=disk, mode=flat, path=112M.sample, cylinders=900, heads=15, spt=17
# ata3-master: type=disk, mode=flat, path=483M.sample, cylinders=1024, heads=15, spt=63
# ata3-slave: type=cdrom, path=iso.sample, status=inserted
#=======================================================================
ata0-master: type=disk, mode=flat, path="xv6.img", cylinders=100, heads=10, spt=10
#ata0-slave: type=cdrom, path=D:, status=inserted
#ata0-slave: type=cdrom, path=/dev/cdrom, status=inserted
#ata0-slave: type=cdrom, path="drive", status=inserted
#ata0-slave: type=cdrom, path=/dev/rcd0d, status=inserted
# where do we send log messages?
log: bochs.log
#log: /dev/stdout
#=======================================================================
# BOOT:
# This defines the boot sequence. Now you can specify up to 3 boot drives.
# You can either boot from 'floppy', 'disk' or 'cdrom'
# legacy 'a' and 'c' are also supported
# Examples:
# boot: floppy
# boot: disk
# boot: cdrom
# boot: c
# boot: a
# boot: cdrom, floppy, disk
#=======================================================================
#boot: floppy
boot: disk
# disable the mouse
#=======================================================================
# CLOCK:
# This defines the parameters of the clock inside Bochs:
#
# SYNC:
# TO BE COMPLETED (see Greg explanation in feature request #536329)
#
# TIME0:
# Specifies the start (boot) time of the virtual machine. Use a time
# value as returned by the time(2) system call. If no time0 value is
# set or if time0 equal to 1 (special case) or if time0 equal 'local',
# the simulation will be started at the current local host time.
# If time0 equal to 2 (special case) or if time0 equal 'utc',
# the simulation will be started at the current utc time.
#
# Syntax:
# clock: sync=[none|slowdown|realtime|both], time0=[timeValue|local|utc]
#
# Example:
# clock: sync=none, time0=local # Now (localtime)
# clock: sync=slowdown, time0=315529200 # Tue Jan 1 00:00:00 1980
# clock: sync=none, time0=631148400 # Mon Jan 1 00:00:00 1990
# clock: sync=realtime, time0=938581955 # Wed Sep 29 07:12:35 1999
# clock: sync=realtime, time0=946681200 # Sat Jan 1 00:00:00 2000
# clock: sync=none, time0=1 # Now (localtime)
# clock: sync=none, time0=utc # Now (utc/gmt)
#
# Default value are sync=none, time0=local
#=======================================================================
#clock: sync=none, time0=local
#=======================================================================
# FLOPPY_BOOTSIG_CHECK: disabled=[0|1]
# Enables or disables the 0xaa55 signature check on boot floppies
# Defaults to disabled=0
# Examples:
# floppy_bootsig_check: disabled=0
# floppy_bootsig_check: disabled=1
#=======================================================================
#floppy_bootsig_check: disabled=1
floppy_bootsig_check: disabled=0
#=======================================================================
# LOG:
# Give the path of the log file you'd like Bochs debug and misc. verbiage
# to be written to. If you don't use this option or set the filename to
# '-' the output is written to the console. If you really don't want it,
# make it "/dev/null" (Unix) or "nul" (win32). :^(
#
# Examples:
# log: ./bochs.out
# log: /dev/tty
#=======================================================================
#log: /dev/null
log: bochsout.txt
#=======================================================================
# LOGPREFIX:
# This handles the format of the string prepended to each log line.
# You may use those special tokens :
# %t : 11 decimal digits timer tick
# %i : 8 hexadecimal digits of cpu current eip (ignored in SMP configuration)
# %e : 1 character event type ('i'nfo, 'd'ebug, 'p'anic, 'e'rror)
# %d : 5 characters string of the device, between brackets
#
# Default : %t%e%d
# Examples:
# logprefix: %t-%e-@%i-%d
# logprefix: %i%e%d
#=======================================================================
#logprefix: %t%e%d
#=======================================================================
# LOG CONTROLS
#
# Bochs now has four severity levels for event logging.
# panic: cannot proceed. If you choose to continue after a panic,
# don't be surprised if you get strange behavior or crashes.
# error: something went wrong, but it is probably safe to continue the
# simulation.
# info: interesting or useful messages.
# debug: messages useful only when debugging the code. This may
# spit out thousands per second.
#
# For events of each level, you can choose to crash, report, or ignore.
# TODO: allow choice based on the facility: e.g. crash on panics from
# everything except the cdrom, and only report those.
#
# If you are experiencing many panics, it can be helpful to change
# the panic action to report instead of fatal. However, be aware
# that anything executed after a panic is uncharted territory and can
# cause bochs to become unstable. The panic is a "graceful exit," so
# if you disable it you may get a spectacular disaster instead.
#=======================================================================
panic: action=ask
error: action=report
info: action=report
debug: action=ignore
#pass: action=fatal
#=======================================================================
# DEBUGGER_LOG:
# Give the path of the log file you'd like Bochs to log debugger output.
# If you really don't want it, make it /dev/null or '-'. :^(
#
# Examples:
# debugger_log: ./debugger.out
#=======================================================================
#debugger_log: /dev/null
#debugger_log: debugger.out
debugger_log: -
#=======================================================================
# COM1, COM2, COM3, COM4:
# This defines a serial port (UART type 16550A). In the 'term' you can specify
# a device to use as com1. This can be a real serial line, or a pty. To use
# a pty (under X/Unix), create two windows (xterms, usually). One of them will
# run bochs, and the other will act as com1. Find out the tty the com1
# window using the `tty' command, and use that as the `dev' parameter.
# Then do `sleep 1000000' in the com1 window to keep the shell from
# messing with things, and run bochs in the other window. Serial I/O to
# com1 (port 0x3f8) will all go to the other window.
# Other serial modes are 'null' (no input/output), 'file' (output to a file
# specified as the 'dev' parameter), 'raw' (use the real serial port - under
# construction for win32), 'mouse' (standard serial mouse - requires
# mouse option setting 'type=serial' or 'type=serial_wheel') and 'socket'
# (connect a networking socket).
#
# Examples:
# com1: enabled=1, mode=null
# com1: enabled=1, mode=mouse
# com2: enabled=1, mode=file, dev=serial.out
# com3: enabled=1, mode=raw, dev=com1
# com3: enabled=1, mode=socket, dev=localhost:8888
#=======================================================================
#com1: enabled=1, mode=term, dev=/dev/ttyp9
#=======================================================================
# PARPORT1, PARPORT2:
# This defines a parallel (printer) port. When turned on and an output file is
# defined the emulated printer port sends characters printed by the guest OS
# into the output file. On some platforms a device filename can be used to
# send the data to the real parallel port (e.g. "/dev/lp0" on Linux, "lpt1" on
# win32 platforms).
#
# Examples:
# parport1: enabled=1, file="parport.out"
# parport2: enabled=1, file="/dev/lp0"
# parport1: enabled=0
#=======================================================================
parport1: enabled=1, file="parport.out"
#=======================================================================
# SB16:
# This defines the SB16 sound emulation. It can have several of the
# following properties.
# All properties are in the format sb16: property=value
# midi: The filename is where the midi data is sent. This can be a
# device or just a file if you want to record the midi data.
# midimode:
# 0=no data
# 1=output to device (system dependent. midi denotes the device driver)
# 2=SMF file output, including headers
# 3=output the midi data stream to the file (no midi headers and no
# delta times, just command and data bytes)
# wave: This is the device/file where wave output is stored
# wavemode:
# 0=no data
# 1=output to device (system dependent. wave denotes the device driver)
# 2=VOC file output, incl. headers
# 3=output the raw wave stream to the file
# log: The file to write the sb16 emulator messages to.
# loglevel:
# 0=no log
# 1=resource changes, midi program and bank changes
# 2=severe errors
# 3=all errors
# 4=all errors plus all port accesses
# 5=all errors and port accesses plus a lot of extra info
# dmatimer:
# microseconds per second for a DMA cycle. Make it smaller to fix
# non-continuous sound. 750000 is usually a good value. This needs a
# reasonably correct setting for the IPS parameter of the CPU option.
#
# For an example look at the next line:
#=======================================================================
#sb16: midimode=1, midi=/dev/midi00, wavemode=1, wave=/dev/dsp, loglevel=2, log=sb16.log, dmatimer=600000
#=======================================================================
# VGA_UPDATE_INTERVAL:
# Video memory is scanned for updates and screen updated every so many
# virtual seconds. The default is 40000, about 25Hz. Keep in mind that
# you must tweak the 'cpu: ips=N' directive to be as close to the number
# of emulated instructions-per-second your workstation can do, for this
# to be accurate.
#
# Examples:
# vga_update_interval: 250000
#=======================================================================
vga_update_interval: 300000
# using for Winstone '98 tests
#vga_update_interval: 100000
#=======================================================================
# KEYBOARD_SERIAL_DELAY:
# Approximate time in microseconds that it takes one character to
# be transfered from the keyboard to controller over the serial path.
# Examples:
# keyboard_serial_delay: 200
#=======================================================================
keyboard_serial_delay: 250
#=======================================================================
# KEYBOARD_PASTE_DELAY:
# Approximate time in microseconds between attempts to paste
# characters to the keyboard controller. This leaves time for the
# guest os to deal with the flow of characters. The ideal setting
# depends on how your operating system processes characters. The
# default of 100000 usec (.1 seconds) was chosen because it works
# consistently in Windows.
#
# If your OS is losing characters during a paste, increase the paste
# delay until it stops losing characters.
#
# Examples:
# keyboard_paste_delay: 100000
#=======================================================================
keyboard_paste_delay: 100000
#=======================================================================
# MOUSE:
# This option prevents Bochs from creating mouse "events" unless a mouse
# is enabled. The hardware emulation itself is not disabled by this.
# You can turn the mouse on by setting enabled to 1, or turn it off by
# setting enabled to 0. Unless you have a particular reason for enabling
# the mouse by default, it is recommended that you leave it off.
# You can also toggle the mouse usage at runtime (control key + middle
# mouse button on X11, SDL, wxWidgets and Win32).
# With the mouse type option you can select the type of mouse to emulate.
# The default value is 'ps2'. The other choices are 'imps2' (wheel mouse
# on PS/2), 'serial', 'serial_wheel' (one com port requires setting
# 'mode=mouse') and 'usb' (3-button mouse - one of the USB ports must be
# connected with the 'mouse' device - requires PCI and USB support).
#
# Examples:
# mouse: enabled=1
# mouse: enabled=1, type=imps2
# mouse: enabled=1, type=serial
# mouse: enabled=0
#=======================================================================
mouse: enabled=0
#debug: action=ignore
info: action=ignore
error: action=report
panic: action=ask
#=======================================================================
# private_colormap: Request that the GUI create and use it's own
# non-shared colormap. This colormap will be used
# when in the bochs window. If not enabled, a
# shared colormap scheme may be used. Not implemented
# on all GUI's.
#
# Examples:
# private_colormap: enabled=1
# private_colormap: enabled=0
#=======================================================================
private_colormap: enabled=0
# this changes how often the screen is refreshed. Lowering it will
# make your screen update more often, which will slow down emulation,
# but will make the display respond faster. It can also be useful if
# you machine is panicing and the most recent screen changes are not
# displayed before it panics.
#=======================================================================
# fullscreen: ONLY IMPLEMENTED ON AMIGA
# Request that Bochs occupy the entire screen instead of a
# window.
#
# Examples:
# fullscreen: enabled=0
# fullscreen: enabled=1
#=======================================================================
#fullscreen: enabled=0
#screenmode: name="sample"
vga_update_interval: 100000
#=======================================================================
# ne2k: NE2000 compatible ethernet adapter
#
# Examples:
# ne2k: ioaddr=IOADDR, irq=IRQ, mac=MACADDR, ethmod=MODULE, ethdev=DEVICE, script=SCRIPT
#
# ioaddr, irq: You probably won't need to change ioaddr and irq, unless there
# are IRQ conflicts.
#
# mac: The MAC address MUST NOT match the address of any machine on the net.
# Also, the first byte must be an even number (bit 0 set means a multicast
# address), and you cannot use ff:ff:ff:ff:ff:ff because that's the broadcast
# address. For the ethertap module, you must use fe:fd:00:00:00:01. There may
# be other restrictions too. To be safe, just use the b0:c4... address.
#
# ethdev: The ethdev value is the name of the network interface on your host
# platform. On UNIX machines, you can get the name by running ifconfig. On
# Windows machines, you must run niclist to get the name of the ethdev.
# Niclist source code is in misc/niclist.c and it is included in Windows
# binary releases.
#
# script: The script value is optional, and is the name of a script that
# is executed after bochs initialize the network interface. You can use
# this script to configure this network interface, or enable masquerading.
# This is mainly useful for the tun/tap devices that only exist during
# Bochs execution. The network interface name is supplied to the script
# as first parameter
#
# If you don't want to make connections to any physical networks,
# you can use the following 'ethmod's to simulate a virtual network.
# null: All packets are discarded, but logged to a few files.
# arpback: ARP is simulated. Disabled by default.
# vde: Virtual Distributed Ethernet
# vnet: ARP, ICMP-echo(ping), DHCP and read/write TFTP are simulated.
# The virtual host uses 192.168.10.1.
# DHCP assigns 192.168.10.2 to the guest.
# TFTP uses the ethdev value for the root directory and doesn't
# overwrite files.
#
#=======================================================================
# ne2k: ioaddr=0x240, irq=9, mac=fe:fd:00:00:00:01, ethmod=fbsd, ethdev=en0 #macosx
# ne2k: ioaddr=0x240, irq=9, mac=b0:c4:20:00:00:00, ethmod=fbsd, ethdev=xl0
# ne2k: ioaddr=0x240, irq=9, mac=b0:c4:20:00:00:00, ethmod=linux, ethdev=eth0
# ne2k: ioaddr=0x240, irq=9, mac=b0:c4:20:00:00:01, ethmod=win32, ethdev=MYCARD
# ne2k: ioaddr=0x240, irq=9, mac=fe:fd:00:00:00:01, ethmod=tap, ethdev=tap0
# ne2k: ioaddr=0x240, irq=9, mac=fe:fd:00:00:00:01, ethmod=tuntap, ethdev=/dev/net/tun0, script=./tunconfig
# ne2k: ioaddr=0x240, irq=9, mac=b0:c4:20:00:00:01, ethmod=null, ethdev=eth0
# ne2k: ioaddr=0x240, irq=9, mac=b0:c4:20:00:00:01, ethmod=vde, ethdev="/tmp/vde.ctl"
# ne2k: ioaddr=0x240, irq=9, mac=b0:c4:20:00:00:01, ethmod=vnet, ethdev="c:/temp"
# changing ips can lead to dramatically different performance. It
# also affects how quickly time passes in the emulated machine.
# Setting it too low can cause clock interrupts to happen too rapidly.
# Setting it too high will make the whole machine feel sluggish.
# (Note: with using clock sync=realtime, the ips parameter is not
# really used, although it is still used for vga updates)
ips: 2000000
#=======================================================================
# KEYBOARD_MAPPING:
# This enables a remap of a physical localized keyboard to a
# virtualized us keyboard, as the PC architecture expects.
# If enabled, the keymap file must be specified.
#
# Examples:
# keyboard_mapping: enabled=1, map=gui/keymaps/x11-pc-de.map
#=======================================================================
keyboard_mapping: enabled=0, map=
# This means that time in the emulated machine is the same as
# realtime. This can be scary because running the same simulation
# twice in a row can lead to different results (because they started
# at different times, for instance). If you want to use non-real
# time, then use sync=none.
clock: sync=realtime, time0=local
# clock: sync=none, time0=946681200 # jan 1, 2000
#=======================================================================
# KEYBOARD_TYPE:
# Type of keyboard return by a "identify keyboard" command to the
# keyboard controler. It must be one of "xt", "at" or "mf".
# Defaults to "mf". It should be ok for almost everybody. A known
# exception is french macs, that do have a "at"-like keyboard.
#
# Examples:
# keyboard_type: mf
#=======================================================================
#keyboard_type: mf
keyboard_serial_delay: 10
#=======================================================================
# USER_SHORTCUT:
# This defines the keyboard shortcut to be sent when you press the "user"
# button in the headerbar. The shortcut string is a combination of maximum
# 3 key names (listed below) separated with a '-' character. The old-style
# syntax (without the '-') still works for the key combinations supported
# in Bochs 2.2.1.
# Valid key names:
# "alt", "bksl", "bksp", "ctrl", "del", "down", "end", "enter", "esc",
# "f1", ... "f12", "home", "ins", "left", "menu", "minus", "pgdwn", "pgup",
# "plus", "right", "shift", "space", "tab", "up", and "win".
#
# Example:
# user_shortcut: keys=ctrl-alt-del
#=======================================================================
#user_shortcut: keys=ctrl-alt-del
#=======================================================================
# I440FXSUPPORT:
# This option controls the presence of the i440FX PCI chipset. You can
# also specify the devices connected to PCI slots. Up to 5 slots are
# available now. These devices are currently supported: ne2k, pcivga,
# pcidev and pcipnic. If Bochs is compiled with Cirrus SVGA support
# you'll have the additional choice 'cirrus'.
#
# Example:
# i440fxsupport: enabled=1, slot1=pcivga, slot2=ne2k
#=======================================================================
#i440fxsupport: enabled=1
#=======================================================================
# USB1:
# This option controls the presence of the USB root hub which is a part
# of the i440FX PCI chipset. With the portX option you can connect devices
# to the hub (currently supported: 'mouse' and 'keypad'). If you connect
# the mouse to one of the ports and use the mouse option 'type=usb' you'll
# have a 3-button USB mouse.
#
# Example:
# usb1: enabled=1, port1=mouse, port2=keypad
#=======================================================================
#usb1: enabled=1
#=======================================================================
# CMOSIMAGE:
# This defines image file that can be loaded into the CMOS RAM at startup.
# The rtc_init parameter controls whether initialize the RTC with values stored
# in the image. By default the time0 argument given to the clock option is used.
# With 'rtc_init=image' the image is the source for the initial time.
#
# Example:
# cmosimage: file=cmos.img, rtc_init=image
#=======================================================================
#cmosimage: file=cmos.img, rtc_init=time0
#=======================================================================
# other stuff
#=======================================================================
#magic_break: enabled=1
#load32bitOSImage: os=nullkernel, path=../kernel.img, iolog=../vga_io.log
#load32bitOSImage: os=linux, path=../linux.img, iolog=../vga_io.log, initrd=../initrd.img
#text_snapshot_check: enable
#-------------------------
# PCI host device mapping
#-------------------------
#pcidev: vendor=0x1234, device=0x5678
#=======================================================================
# GDBSTUB:
# Enable GDB stub. See user documentation for details.
# Default value is enabled=0.
#=======================================================================
#gdbstub: enabled=0, port=1234, text_base=0, data_base=0, bss_base=0
#=======================================================================
# IPS:
# The IPS directive is DEPRECATED. Use the parameter IPS of the CPU
# directive instead.
#=======================================================================
#ips: 10000000
#=======================================================================
# for Macintosh, use the style of pathnames in the following
# examples.
#
# vgaromimage: :bios:VGABIOS-elpin-2.40
# romimage: file=:bios:BIOS-bochs-latest, address=0xf0000
# floppya: 1_44=[fd:], status=inserted
#=======================================================================

8
main.c
View file

@ -14,8 +14,8 @@ main()
cprintf("\nxV6\n\n");
// initialize physical memory allocator
kinit();
kinit(); // physical memory allocator
tinit(); // traps and interrupts
// create fake process zero
p = &proc[0];
@ -33,6 +33,10 @@ main()
p = newproc(&proc[0]);
// xxx copy instructions to p->mem
p->mem[0] = 0x90; // nop
p->mem[1] = 0x90; // nop
p->mem[2] = 0x42; // inc %edx
p->mem[3] = 0x42; // inc %edx
p->tf->tf_eip = 0;
p->tf->tf_esp = p->sz;

17
proc.c
View file

@ -20,7 +20,8 @@ setupsegs(struct proc *p)
p->ts.ts_ss0 = SEG_KDATA << 3;
p->ts.ts_esp0 = (unsigned)(p->kstack + KSTACKSIZE);
memset(&p->gdt, 0, sizeof(p->gdt));
// XXX it may be wrong to modify the current segment table!
p->gdt[0] = SEG_NULL;
p->gdt[SEG_KCODE] = SEG(STA_X|STA_R, 0, 0xffffffff, 0);
p->gdt[SEG_KDATA] = SEG(STA_W, 0, 0xffffffff, 0);
@ -73,7 +74,7 @@ newproc(struct proc *op)
np->esp = (unsigned) sp;
np->ebp = (unsigned) sp;
cprintf("esp %x ebp %x mem %x\n", np->esp, np->ebp, np->mem);
cprintf("newproc esp %x ebp %x mem %x\n", np->esp, np->ebp, np->mem);
return np;
}
@ -101,12 +102,18 @@ swtch(struct proc *op)
op->ebp = read_ebp();
op->esp = read_esp();
cprintf("switching\n");
// XXX callee-saved registers?
// this happens to work, but probably isn't safe:
// it's not clear that np->ebp will evaluate
// correctly after changing the stack pointer.
// XXX probably ought to lgdt on trap return too
asm volatile("lgdt %0" : : "g" (np->gdt_pd.pd_lim));
ltr(SEG_TSS << 3);
// this happens to work, but probably isn't safe:
// it's not clear that np->ebp is guaranteed to evaluate
// correctly after changing the stack pointer.
asm volatile("movl %0, %%esp" : : "g" (np->esp));
asm volatile("movl %0, %%ebp" : : "g" (np->ebp));
}

16
trapasm.S
View file

@ -1,4 +1,20 @@
#include "mmu.h"
.text
.globl alltraps
.globl trap
alltraps:
/* vectors.S sends all traps here */
pushl %ds # build
pushl %es # trap
pushal # frame
movl $16,%eax # SEG_KDATA << 3
movw %ax,%ds # kernel
movw %ax,%es # segments
pushl %esp # pass pointer to this trapframe
call trap # and call trap()
# return falls through to trapret...
.globl trapret
/*
* a forked process RETs here

25
vectors.pl Executable file
View file

@ -0,0 +1,25 @@
#!/usr/bin/perl -w
# generate vectors.S, the trap/interrupt entry points.
# there has to be one entry point per interrupt number
# since otherwise there's no way to tell the interrupt
# number.
print "/* generated by vectors.pl */\n";
print ".text\n";
print ".globl alltraps\n";
for(my $i = 0; $i < 256; $i++){
print ".globl vector$i\n";
print "vector$i:\n";
if(($i < 8 || $i > 14) && $i != 17){
print "\tpushl \$0\n";
}
print "\tpushl $i\n";
print "\tjmp alltraps\n";
}
print ".data\n";
print ".globl vectors\n";
print "vectors:\n";
for(my $i = 0; $i < 256; $i++){
print ".long vector$i\n";
}