Mathieu Maret
6 years ago
commit
c60f7450eb
@ -0,0 +1,131 @@
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SOS: A Simple Operating System
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Compilation/Installation/Test instructions
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Compilation
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===========
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IMPORTANT
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---------
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Don't forget to run 'make clean' before 'make' after you have modified
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any source or header file(s).
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On a x86 host where grub is correctly installed
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-----------------------------------------------
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Simply run 'make'
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On a non-x86 host (without grub of course !)
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--------------------------------------------
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See extra/README
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On an x86 host without Grub, or with a buggy Grub
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-------------------------------------------------
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See extra/README
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How do I know I have a buggy grub installation ? Answer: in the qemu
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PC emulator, Grub hangs while loading the kernel
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Installation
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============
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Nothing special to do besides compiling
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Test the SOS Kernel
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===================
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On a x86 real machine with Grub installed
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-----------------------------------------
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1st method
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=> Boot the sos.elf file (append 'kernel=<path_to>sos.elf' in the
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menu.lst or type it on Grub's command line) from a hard disk, a
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floppy, or from the network
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2nd method
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=> Copy the file 'fd.img' to a floppy and boot from it
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On a x86 real machine without Grub installed
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--------------------------------------------
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1st method
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=> see extra/README to compile with the grub floppy image we provide,
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copy the file 'fd.img' to a floppy, and boot from it
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2nd method
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=> see extra/README to compile with the boot sector we provide (up to
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article 2 only), copy the file 'extra/sos_bsect.img' to a floppy,
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and boot from it
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Inside a PC emulator (x86 and non-x86 hosts)
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--------------------------------------------
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Tested on both the bochs emulator (x86/linux, sparc/solaris and
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ppc/linux hosts, 'apt-get install bochs-x vgabios' on debian
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testing/unstable), and the qemu system emulator (with libsdl
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installed: 'apt-get install libsdl1.2-dev' on debian
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testing/unstable).
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1/ Grub is installed on the host (x86 hosts only)
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- - - - - - - - - - - - - - - - - - - - - - - - -
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bochs: boot from the file 'fd.img'. Example of a ~/.bochsrc:
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floppya: 1_44=/home/d2/sos/fd.img, status=inserted
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romimage: file=/usr/share/bochs/BIOS-bochs-latest, address=0xf0000
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vgaromimage: /usr/share/vgabios/vgabios.bin
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megs:63 # 63 Mo de RAM
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qemu: run 'qemu -fda fd.img'
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If grub hangs while loading the kernel, please go to method 2/
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2/ Grub is not installed (all hosts)
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- - - - - - - - - - - - - - - - - -
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See extra/README to generate a floppy image with the Grub floppy
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image we provide, and:
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bochs: boot from the file 'fd.img'
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qemu: run 'qemu -fda fd.img'
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3/ Bonus: boot with the bootsector we provide (all hosts, up to art. 2 ONLY !)
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- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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See extra/README to generate a floppy image with the boot sector we
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provide, and:
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bochs: boot from the file 'extra/sos_bsect.img'
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qemu: run 'qemu -fda extra/sos_qemu.img'
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NOTE: After article 2, this way of booting is not supported: please
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use the method 2/ above.
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NOTE : recommended versions of the tools
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----------------------------------------
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- OS : Linux 2.6.11.7-d2-1 i686
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- gcc : gcc (GCC) 3.3.5 (Debian 1:3.3.5-8)
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- GNU binutils : GNU ld version 2.15
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- GNU make : GNU Make 3.80
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Also tested with (on ppc/debian host):
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- OS : Linux 2.6.10-powerpc ppc
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- gcc : gcc (GCC) 3.2.2
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- GNU binutils : GNU ld version 2.13.2
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- GNU make : GNU Make 3.80
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--
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David Decotigny
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@ -0,0 +1,83 @@
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## Copyright (C) 2004,2005 The SOS Team
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##
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## This program is free software; you can redistribute it and/or
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## modify it under the terms of the GNU General Public License
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## as published by the Free Software Foundation; either version 2
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## of the License, or (at your option) any later version.
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##
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## This program is distributed in the hope that it will be useful,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU General Public License for more details.
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##
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## You should have received a copy of the GNU General Public License
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## along with this program; if not, write to the Free Software
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## Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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## USA.
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CC=gcc
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LD=ld
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CFLAGS = -Wall -nostdinc -ffreestanding -DKERNEL_SOS
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LIBGCC := $(shell $(CC) -print-libgcc-file-name) # To benefit from FP/64bits artihm.
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LDFLAGS = --warn-common -nostdlib
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OBJECTS = bootstrap/multiboot.o \
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hwcore/idt.o hwcore/gdt.o \
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hwcore/swintr.o hwcore/swintr_wrappers.o \
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hwcore/exception.o hwcore/exception_wrappers.o \
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hwcore/irq.o hwcore/irq_wrappers.o hwcore/i8259.o \
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hwcore/paging.o \
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hwcore/i8254.o drivers/x86_videomem.o drivers/bochs.o \
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hwcore/cpu_context.o hwcore/cpu_context_switch.o \
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hwcore/mm_context.o \
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sos/kmem_vmm.o sos/kmem_slab.o sos/kmalloc.o \
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sos/physmem.o sos/klibc.o \
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sos/thread.o sos/kwaitq.o \
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sos/time.o sos/sched.o sos/ksynch.o \
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sos/process.o sos/syscall.o \
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sos/assert.o sos/main.o sos/mouse_sim.o \
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sos/uaccess.o sos/calcload.o \
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userland/userprogs.kimg sos/test-art7.o
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KERNEL_OBJ = sos.elf
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MULTIBOOT_IMAGE = fd.img
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PWD := $(shell pwd)
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# Main target
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all: $(MULTIBOOT_IMAGE)
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$(MULTIBOOT_IMAGE): $(KERNEL_OBJ)
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./support/build_image.sh $@ $<
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$(KERNEL_OBJ): $(OBJECTS) ./support/sos.lds
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$(LD) $(LDFLAGS) -T ./support/sos.lds -o $@ $(OBJECTS) $(LIBGCC)
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-nm -C $@ | cut -d ' ' -f 1,3 > sos.map
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size $@
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-include .mkvars
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# Create the userland programs to include in the kernel image
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userland/userprogs.kimg: FORCE
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$(MAKE) -C userland
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# Create objects from C source code
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%.o: %.c
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$(CC) -I$(PWD) -c $< $(CFLAGS) -o $@
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# Create objects from assembler (.S) source code
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%.o: %.S
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$(CC) -I$(PWD) -c $< $(CFLAGS) -DASM_SOURCE=1 -o $@
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FORCE:
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@
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# Clean directory
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clean:
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$(RM) *.img *.o mtoolsrc *~ menu.txt *.img *.elf *.bin *.map
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$(RM) *.log *.out bochs*
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$(RM) bootstrap/*.o bootstrap/*~
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$(RM) drivers/*.o drivers/*~
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$(RM) hwcore/*.o hwcore/*~
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$(RM) sos/*.o sos/*~
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$(RM) support/*~
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$(RM) extra/*~
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$(MAKE) -C userland clean
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@ -0,0 +1,90 @@
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SOS: A Simple Operating System
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This is SOS, a Simple Operating System for i386-family
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processors. This is as simple as possible to show a way to program a
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basic Operating System on real common hardware (PC). The code should
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be easily readable and understandable thanks to frequent comments, and
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references to external documentation. We chose to implement the basic
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features of an OS, thus making design decisions targetting towards
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simplicity of understanding, covering most of the OS classical
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concepts, but not aiming at proposing yet another full-fledged
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competitive OS (Linux is quite good at it). However, for those who
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would like to propose some enhancements, we are open to any code
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suggestions (patches only, please). And yes, there might be bugs in
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the code, so please send us any bug report, and/or patches !
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The OS comes as a set of articles (in french) to be published in the
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journal "Linux Magazine France". Each month, the part of the code
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related to the current article's theme is released (see VERSION file),
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and the resulting OS can be successfully compiled and run, by booting
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it from a floppy on a real machine (tested AMD k7, Cyrix and Intel P4
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pentiums), or through an x86 emulator (bochs or qemu). The resulting
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OS is available as a multiboot compliant ELF kernel (sos.elf) and as a
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floppy image (fd.img). It provides a very very very basic demo whose
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aim is to understand how everything works, not to animate sprites on
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the screen with 5:1 dolby sound.
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The initial technical features and lack-of-features of the OS are:
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- monolithic kernel, fully interruptible, non-preemptible (big kernel
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lock), target machines = i386 PC or better
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- compiles on any host where the gcc/binutils toolchain (target
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i586-gnu) is available. Can be tested on real i486/pentium
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hardware, or on any host that can run an i486/pentium PC emulator
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(bochs or qemu)
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- kernel loaded by grub, or by a sample bootsector (up to article 2
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ONLY)
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- clear separation of physical memory and virtual memory concepts,
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even inside the kernel: no identity-mapping of the physical memory
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inside the kernel (allows to move virtual mappings of kernel pages
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at run-time, eg to free ISA DMA pages, and to avercome the 4G RAM
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barrier)
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- slab-type kernel memory allocation
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- no swap, no reverse mapping
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- VERY simple drivers: keyboard, x86 video memory, IDE disks
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- logical devices: partitions, FAT filesystem, "hard-coded"
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mountpoints only (~ MSDOS)
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- no network stack
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- user-level features: ELF loader (no shared libraries), processes,
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user threads (kernel-level scheduling only), mmap API, basic VFS
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To understand where to look at for what, here is a brief description:
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- Makefile: the (ONLY) makefile of the OS. Targets are basically
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'all' and 'clean'
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- bootstrap/ directory: code to load the kernel. Both the stuff
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needed for a multiboot-compliant loader (eg grub) AND a bootsector
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are provided. The bootsector may only be used up to article 2.
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- sos/ directory: the entry routine for the kernel (main.c), various
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systemwide header files, a set of common useful C routines
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("nano-klibc"), and kernel subsystems (kernel memory management,
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etc...)
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- hwcore/ directory: Low-level CPU- and kernel-related routines
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(interrupt/exception management, translation tables and segment
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registers, ...)
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- drivers/ directory: basic kernel drivers for various (non CPU)
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devices (keyboard, x86 video memory, bochs 0xe9 port, ...). Used
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mainly for debugging
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- support/ directory: scripts and configuration files to build the
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floppy images
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- extra/ directory: a set of configuration files to be customized for
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non-x86 host installations (yes, we primarily develop SOS on a ppc, for
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the x86 target of course), or for grub-less installations. See
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README file in this directory.
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The code is licensed under the terms of the GNU GPL version 2 (see
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LICENSE file).
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Enjoy !
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David Decotigny, Thomas Petazzoni, the Kos team
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http://sos.enix.org/
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http://david.decotigny.free.fr/
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http://kos.enix.org/~thomas/
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http://kos.enix.org/
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--
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David Decotigny
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PS: Made with a Mac.
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@ -0,0 +1,11 @@
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SOS -- Simple OS
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Copyright (C) 2003,2004,2005 The SOS Team (David Decotigny & Thomas Petazzoni)
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Version "Article 7 (1st part)" -- Basic user programs support
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This program is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU General Public License
|
||||
as published by the Free Software Foundation; either version 2
|
||||
of the License, or (at your option) any later version.
|
||||
|
||||
See the LICENSE file included in the distribution.
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@ -0,0 +1,85 @@
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/* Copyright (C) 1999 Free Software Foundation, Inc.
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|
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This program is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU General Public License
|
||||
as published by the Free Software Foundation; either version 2
|
||||
of the License, or (at your option) any later version.
|
||||
|
||||
This program is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
GNU General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU General Public License
|
||||
along with this program; if not, write to the Free Software
|
||||
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
|
||||
USA.
|
||||
*/
|
||||
|
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/* The operating system is booted by Grub, so we almost have nothing
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to do to boot it. We only have to conform to the Multiboot
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standard, as defined by the Grub documentation */
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#define ASM 1
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/* The multiboot.h header contains a lot of multiboot standard
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definitions */
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#include "multiboot.h"
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/* The multiboot header itself. It must come first. */
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.section ".multiboot"
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/* Multiboot header must be aligned on a 4-byte boundary */
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.align 4
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multiboot_header:
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/* magic= */ .long MULTIBOOT_HEADER_MAGIC
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/* flags= */ .long MULTIBOOT_HEADER_FLAGS
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/* checksum= */ .long -(MULTIBOOT_HEADER_MAGIC \
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+MULTIBOOT_HEADER_FLAGS)
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/* header_addr= */ .long multiboot_header
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/* load_addr= */ .long __b_load
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/* load_end_addr=*/ .long __e_load
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/* bss_end_addr= */ .long __e_kernel
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/* entry_addr= */ .long multiboot_entry
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/* Here is the beginning of the code of our operating system */
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.text
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.globl start, _start
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start:
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_start:
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multiboot_entry:
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/* Set up a stack */
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movl $(stack + MULTIBOOT_STACK_SIZE), %ebp
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movl %ebp, %esp
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|
||||
/* Set EFLAGS to 0 */
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pushl $0
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/* pop stack into the EFLAGS register */
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popf
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/* Push the magic and the address on the stack, so that they
|
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will be the parameters of the cmain function */
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pushl %ebx
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pushl %eax
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/* Call the cmain function (os.c) */
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call EXT_C(sos_main)
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|
||||
/* Should never get there */
|
||||
loop:
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||||
hlt
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||||
jmp loop
|
||||
|
||||
/* Here is the stack */
|
||||
.section ".init_stack", "aw", @nobits
|
||||
.size stack, MULTIBOOT_STACK_SIZE
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stack:
|
||||
.space MULTIBOOT_STACK_SIZE
|
||||
|
||||
/* Some data characterizing the stack addresses */
|
||||
.data
|
||||
.globl bootstrap_stack_bottom
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||||
bootstrap_stack_bottom: .long stack
|
||||
|
||||
.globl bootstrap_stack_size
|
||||
bootstrap_stack_size: .long MULTIBOOT_STACK_SIZE
|
||||
@ -0,0 +1,133 @@
|
||||
#ifndef __MULTIBOOT_H__
|
||||
#define __MULTIBOOT_H__
|
||||
|
||||
/* multiboot.h - the header for Multiboot */
|
||||
/* Copyright (C) 1999 Free Software Foundation, Inc.
|
||||
|
||||
This program is free software; you can redistribute it and/or modify
|
||||
it under the terms of the GNU General Public License as published by
|
||||
the Free Software Foundation; either version 2 of the License, or
|
||||
(at your option) any later version.
|
||||
|
||||
This program is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
GNU General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU General Public License
|
||||
along with this program; if not, write to the Free Software
|
||||
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
||||
|
||||
/* Macros. */
|
||||
|
||||
/* The magic number for the Multiboot header. */
|
||||
#define MULTIBOOT_HEADER_MAGIC 0x1BADB002
|
||||
|
||||
/* The flags for the Multiboot header. */
|
||||
#define MULTIBOOT_HEADER_FLAGS 0x00010003
|
||||
|
||||
/* The magic number passed by a Multiboot-compliant boot loader. */
|
||||
#define MULTIBOOT_BOOTLOADER_MAGIC 0x2BADB002
|
||||
|
||||
/* The size of our stack (16KB). */
|
||||
#define MULTIBOOT_STACK_SIZE 0x4000
|
||||
|
||||
#define MULTIBOOT_CMDLINE 4
|
||||
#define MULTIBOOT_MODS 8
|
||||
|
||||
/* C symbol format. HAVE_ASM_USCORE is defined by configure. */
|
||||
#ifdef HAVE_ASM_USCORE
|
||||
# define EXT_C(sym) _ ## sym
|
||||
#else
|
||||
# define EXT_C(sym) sym
|
||||
#endif
|
||||
|
||||
#ifndef ASM
|
||||
/* Do not include here in the assembler sources. */
|
||||
|
||||
#include <sos/types.h>
|
||||
|
||||
/* The address of the stack of the bootstrap thread */
|
||||
extern sos_vaddr_t bootstrap_stack_bottom;
|
||||
extern sos_size_t bootstrap_stack_size;
|
||||
|
||||
/* Types. */
|
||||
|
||||
/* The Multiboot header. */
|
||||
typedef struct multiboot_header
|
||||
{
|
||||
unsigned long magic;
|
||||
unsigned long flags;
|
||||
unsigned long checksum;
|
||||
unsigned long header_addr;
|
||||
unsigned long load_addr;
|
||||
unsigned long load_end_addr;
|
||||
unsigned long bss_end_addr;
|
||||
unsigned long entry_addr;
|
||||
} multiboot_header_t;
|
||||
|
||||
/* The symbol table for a.out. */
|
||||
typedef struct aout_symbol_table
|
||||
{
|
||||
unsigned long tabsize;
|
||||
unsigned long strsize;
|
||||
unsigned long addr;
|
||||
unsigned long reserved;
|
||||
} aout_symbol_table_t;
|
||||
|
||||
/* The section header table for ELF. */
|
||||
typedef struct elf_section_header_table
|
||||
{
|
||||
unsigned long num;
|
||||
unsigned long size;
|
||||
unsigned long addr;
|
||||
unsigned long shndx;
|
||||
} elf_section_header_table_t;
|
||||
|
||||
/* The Multiboot information. */
|
||||
typedef struct multiboot_info
|
||||
{
|
||||
unsigned long flags;
|
||||
unsigned long mem_lower;
|
||||
unsigned long mem_upper;
|
||||
unsigned long boot_device;
|
||||
unsigned long cmdline;
|
||||
unsigned long mods_count;
|
||||
unsigned long mods_addr;
|
||||
union
|
||||
{
|
||||
aout_symbol_table_t aout_sym;
|
||||
elf_section_header_table_t elf_sec;
|
||||
} u;
|
||||
unsigned long mmap_length;
|
||||
unsigned long mmap_addr;
|
||||
unsigned long drives_length;
|
||||
unsigned long drives_addr;
|
||||
} multiboot_info_t;
|
||||
|
||||
/* The module structure. */
|
||||
typedef struct module
|
||||
{
|
||||
unsigned long mod_start;
|
||||
unsigned long mod_end;
|
||||
unsigned long string;
|
||||
unsigned long reserved;
|
||||
} module_t;
|
||||
|
||||
/* The memory map. Be careful that the offset 0 is base_addr_low
|
||||
but no size. */
|
||||
typedef struct memory_map
|
||||
{
|
||||
unsigned long size;
|
||||
unsigned long base_addr_low;
|
||||
unsigned long base_addr_high;
|
||||
unsigned long length_low;
|
||||
unsigned long length_high;
|
||||
unsigned long type;
|
||||
} memory_map_t;
|
||||
|
||||
void dump_multiboot_info(multiboot_info_t *mbi);
|
||||
|
||||
#endif /* ! ASM */
|
||||
|
||||
#endif /* __MULTIBOOT_H__ */
|
||||
@ -0,0 +1,123 @@
|
||||
/* Copyright (C) 2004 David Decotigny
|
||||
|
||||
This program is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU General Public License
|
||||
as published by the Free Software Foundation; either version 2
|
||||
of the License, or (at your option) any later version.
|
||||
|
||||
This program is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
GNU General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU General Public License
|
||||
along with this program; if not, write to the Free Software
|
||||
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
|
||||
USA.
|
||||
*/
|
||||
#include <hwcore/ioports.h>
|
||||
#include <sos/klibc.h>
|
||||
|
||||
#include "bochs.h"
|
||||
|
||||
/* This is a special hack that is only useful when running the
|
||||
operating system under the Bochs emulator. */
|
||||
#define SOS_BOCHS_IOPORT 0xe9
|
||||
|
||||
sos_ret_t sos_bochs_setup(void)
|
||||
{
|
||||
return SOS_OK;
|
||||
}
|
||||
|
||||
#define _putchar(chr) \
|
||||
outb((chr), SOS_BOCHS_IOPORT)
|
||||
|
||||
sos_ret_t sos_bochs_putchar(char c)
|
||||
{
|
||||
_putchar(c);
|
||||
|
||||
return SOS_OK;
|
||||
}
|
||||
|
||||
sos_ret_t sos_bochs_putstring(const char* str)
|
||||
{
|
||||
for ( ; str && (*str != '\0') ; str++)
|
||||
_putchar(*str);
|
||||
|
||||
return SOS_OK;
|
||||
}
|
||||
|
||||
sos_ret_t sos_bochs_puthex(unsigned val, int nbytes)
|
||||
{
|
||||
unsigned c;
|
||||
|
||||
#define BOCHS_PRTHEX(q) \
|
||||
({ unsigned char r; if ((q) >= 10) r='a'+(q)-10; \
|
||||
else r='0'+(q); _putchar(r); })
|
||||
|
||||
switch (nbytes)
|
||||
{
|
||||
case 4:
|
||||
c = (val >> 24) & 0xff;
|
||||
BOCHS_PRTHEX((c >> 4)&0xf);
|
||||
BOCHS_PRTHEX(c&0xf);
|
||||
case 3:
|
||||
c = (val >> 16) & 0xff;
|
||||
BOCHS_PRTHEX((c >> 4)&0xf);
|
||||
BOCHS_PRTHEX(c&0xf);
|
||||
case 2:
|
||||
c = (val >> 8) & 0xff;
|
||||
BOCHS_PRTHEX((c >> 4)&0xf);
|
||||
BOCHS_PRTHEX(c&0xf);
|
||||
case 1:
|
||||
c = val & 0xff;
|
||||
BOCHS_PRTHEX((c >> 4)&0xf);
|
||||
BOCHS_PRTHEX(c&0xf);
|
||||
}
|
||||
|
||||
return SOS_OK;
|
||||
}
|
||||
|
||||
|
||||
sos_ret_t sos_bochs_hexdump(const void* addr, int nbytes)
|
||||
{
|
||||
int offs;
|
||||
for (offs = 0 ; offs < nbytes ; offs++)
|
||||
{
|
||||
const unsigned char *c;
|
||||
|
||||
if ((offs % 16) == 0)
|
||||
{
|
||||
sos_bochs_putstring("0x");
|
||||
sos_bochs_puthex(offs, 4);
|
||||
}
|
||||
|
||||
if ((offs % 8) == 0)
|
||||
sos_bochs_putstring(" ");
|
||||
|
||||
c = (const unsigned char*)(addr + offs);
|
||||
sos_bochs_puthex(*c, 1);
|
||||
sos_bochs_putstring(" ");
|
||||
|
||||
if (((offs + 1) % 16) == 0)
|
||||
sos_bochs_putstring("\n");
|
||||
}
|
||||
|
||||
if (offs % 16)
|
||||
sos_bochs_putstring("\n");
|
||||
|
||||
return SOS_OK;
|
||||
}
|
||||
|
||||
|
||||
sos_ret_t sos_bochs_printf(const char *format, /* args */...)
|
||||
{
|
||||
char buff[256];
|
||||
va_list ap;
|
||||
|
||||
va_start(ap, format);
|
||||
vsnprintf(buff, sizeof(buff), format, ap);
|
||||
va_end(ap);
|
||||
|
||||
return sos_bochs_putstring(buff);
|
||||
}
|
||||
@ -0,0 +1,55 @@
|
||||
/* Copyright (C) 2004 David Decotigny
|
||||
|
||||
This program is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU General Public License
|
||||
as published by the Free Software Foundation; either version 2
|
||||
of the License, or (at your option) any later version.
|
||||
|
||||
This program is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
GNU General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU General Public License
|
||||
along with this program; if not, write to the Free Software
|
||||
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
|
||||
USA.
|
||||
*/
|
||||
#ifndef _SOS_BOCHS_H_
|
||||
#define _SOS_BOCHS_H_
|
||||
|
||||
/**
|
||||
* @file bochs.h
|
||||
*
|
||||
* If you compiled Bochs with the --enable-e9-hack, then any character
|
||||
* printed to the 0xE9 I/O port is printed to the xterm that is
|
||||
* running Bochs. This may appear to be a detail, but in fact, this
|
||||
* functionnality is *VERY* precious for debugging purposes. This
|
||||
* """driver""" handles this feature.
|
||||
*/
|
||||
|
||||
#include <sos/errno.h>
|
||||
#include <sos/types.h>
|
||||
|
||||
sos_ret_t sos_bochs_setup(void);
|
||||
|
||||
sos_ret_t sos_bochs_putchar(char c);
|
||||
|
||||
sos_ret_t sos_bochs_putstring(const char* str);
|
||||
|
||||
/** Print the least signficant 32 (nbytes == 4), 24 (nbytes == 3), 16
|
||||
(nbytes == 2) or 8 (nbytes == 1) bits of val in hexadecimal. */
|
||||
sos_ret_t sos_bochs_puthex(unsigned val, int nbytes);
|
||||
|
||||
/** hexdump-style pretty printing */
|
||||
sos_ret_t sos_bochs_hexdump(const void* addr, int nbytes);
|
||||
|
||||
/**
|
||||
* Print the formatted string. Very restricted version of printf(3):
|
||||
* 1/ can print max 255 chars, 2/ supports only %d/%i, %c, %s, %x
|
||||
* without any support for flag charachters (eg %08x).
|
||||
*/
|
||||
sos_ret_t sos_bochs_printf(const char *format, /* args */...)
|
||||
__attribute__ ((format (printf, 1, 2)));
|
||||
|
||||
#endif
|
||||
@ -0,0 +1,127 @@
|
||||
/* Copyright (C) 2004 David Decotigny
|
||||
|
||||
This program is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU General Public License
|
||||
as published by the Free Software Foundation; either version 2
|
||||
of the License, or (at your option) any later version.
|
||||
|
||||
This program is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
GNU General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU General Public License
|
||||
along with this program; if not, write to the Free Software
|
||||
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
|
||||
USA.
|
||||
*/
|
||||
#include <sos/klibc.h>
|
||||
#include <hwcore/ioports.h>
|
||||
|
||||
#include "x86_videomem.h"
|
||||
|
||||
/* The text video memory starts at address 0xB8000. Odd bytes are the
|
||||
ASCII value of the character, even bytes are attribute for the
|
||||
preceding character. */
|
||||
#define VIDEO 0xb8000
|
||||
|
||||
|
||||
/* Console screen size */
|
||||
#define LINES 25
|
||||
#define COLUMNS 80
|
||||
|
||||
|
||||
/** The structure of a character element in the video memory. @see
|
||||
http://webster.cs.ucr.edu/AoA DOS edition chapter 23 */
|
||||
typedef struct {
|
||||
unsigned char character;
|
||||
unsigned char attribute;
|
||||
} __attribute__ ((packed)) x86_video_mem[LINES*COLUMNS];
|
||||
|
||||
|
||||
|
||||
/** The base pointer for the video memory */
|
||||
static volatile x86_video_mem *video = (volatile x86_video_mem*)VIDEO;
|
||||
|
||||
sos_ret_t sos_x86_videomem_setup(void)
|
||||
{
|
||||
/*
|
||||
* Hide cursor. @see Ralf Brown's interrupt (and port) list
|
||||
* http://www-2.cs.cmu.edu/~ralf/files.html
|
||||
*/
|
||||
#define CRT_REG_INDEX 0x3d4
|
||||
#define CRT_REG_DATA 0x3d5
|
||||
|
||||
/* CRT index port => ask for access to register 0xa ("cursor
|
||||
start") */
|
||||
outb(0x0a, CRT_REG_INDEX);
|
||||
|
||||
/* (RBIL Tables 708 & 654) CRT Register 0xa => bit 5 = cursor OFF */
|
||||
outb(1 << 5, CRT_REG_DATA);
|
||||
|
||||
return SOS_OK;
|
||||
}
|
||||
|
||||
|
||||
sos_ret_t sos_x86_videomem_cls(unsigned char attribute)
|
||||
{
|
||||
/* Clears the screen */
|
||||
int i;
|
||||
for(i = 0 ; i < LINES*COLUMNS ; i++)
|
||||
{
|
||||
(*video)[i].character = 0;
|
||||
(*video)[i].attribute = attribute;
|
||||
}
|
||||
|
||||
return SOS_OK;
|
||||
}
|
||||
|
||||
|
||||
sos_ret_t sos_x86_videomem_putstring(unsigned char row, unsigned char col,
|
||||
unsigned char attribute,
|
||||
const char *str)
|
||||
{
|
||||
unsigned video_offs = row*COLUMNS + col;
|
||||
|
||||
if (video_offs >= LINES*COLUMNS)
|
||||
return -SOS_EINVAL;
|
||||
|
||||
for ( ; str && *str && (video_offs < LINES*COLUMNS) ; str++, video_offs++)
|
||||
{
|
||||
(*video)[video_offs].character = (unsigned char)*str;
|
||||
(*video)[video_offs].attribute = attribute;
|
||||
}
|
||||
|
||||
return SOS_OK;
|
||||
}
|
||||
|
||||
|
||||
sos_ret_t sos_x86_videomem_putchar(unsigned char row, unsigned char col,
|
||||
unsigned char attribute,
|
||||
unsigned char c)
|
||||
{
|
||||
unsigned video_offs = row*COLUMNS + col;
|
||||
|
||||
if (video_offs >= LINES*COLUMNS)
|
||||
return -SOS_EINVAL;
|
||||
|
||||
(*video)[video_offs].character = c;
|
||||
(*video)[video_offs].attribute = attribute;
|
||||
|
||||
return SOS_OK;
|
||||
}
|
||||
|
||||
|
||||
sos_ret_t sos_x86_videomem_printf(unsigned char row, unsigned char col,
|
||||
unsigned char attribute,
|
||||
const char *format, /* args */...)
|
||||
{
|
||||
char buff[256];
|
||||
va_list ap;
|
||||
|
||||
va_start(ap, format);
|
||||
vsnprintf(buff, sizeof(buff), format, ap);
|
||||
va_end(ap);
|
||||
|
||||
return sos_x86_videomem_putstring(row, col, attribute, buff);
|
||||
}
|
||||
@ -0,0 +1,97 @@
|
||||
/* Copyright (C) 2004 David Decotigny
|
||||
|
||||
This program is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU General Public License
|
||||
as published by the Free Software Foundation; either version 2
|
||||
of the License, or (at your option) any later version.
|
||||
|
||||
This program is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
GNU General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU General Public License
|
||||
along with this program; if not, write to the Free Software
|
||||
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
|
||||
USA.
|
||||
*/
|
||||
#ifndef _SOS_X86_VIDEOMEM_H_
|
||||
#define _SOS_X86_VIDEOMEM_H_
|
||||
|
||||
/**
|
||||
* @file x86_videomem.h
|
||||
*
|
||||
* On x86 PC platforms, the text mode screen memory (and CGA/EGA/VGA
|
||||
* too) is mapped into physical memory. This file handles access to
|
||||
* this screen, supposed to be set in text-mode, through this memory
|
||||
* area. All the functions below print the characters directly to the
|
||||
* memory, without interpreting the escaped characters (such as \n,
|
||||
* \r...)
|
||||
*/
|
||||
|
||||
#include <sos/errno.h>
|
||||
|
||||
/**
|
||||
* x86 video attributes
|
||||
* See http://webster.cs.ucr.edu/AoA/DOS/ch23/CH23-1.html
|
||||
*/
|
||||
/* Normal and Dark/Light foreground */
|
||||
#define SOS_X86_VIDEO_FG_BLACK 0
|
||||
#define SOS_X86_VIDEO_FG_DKGRAY 8
|
||||
#define SOS_X86_VIDEO_FG_BLUE 1
|
||||
#define SOS_X86_VIDEO_FG_LTBLUE 9
|
||||
#define SOS_X86_VIDEO_FG_GREEN 2
|
||||
#define SOS_X86_VIDEO_FG_LTGREEN 10
|
||||
#define SOS_X86_VIDEO_FG_CYAN 3
|
||||
#define SOS_X86_VIDEO_FG_LTCYAN 11
|
||||
#define SOS_X86_VIDEO_FG_RED 4
|
||||
#define SOS_X86_VIDEO_FG_LTRED 12
|
||||
#define SOS_X86_VIDEO_FG_MAGENTA 5
|
||||
#define SOS_X86_VIDEO_FG_LTMAGENTA 13
|
||||
#define SOS_X86_VIDEO_FG_BROWN 6
|
||||
#define SOS_X86_VIDEO_FG_YELLOW 14
|
||||
#define SOS_X86_VIDEO_FG_LTGRAY 7
|
||||
#define SOS_X86_VIDEO_FG_WHITE 15
|
||||
/* Background */
|
||||
#define SOS_X86_VIDEO_BG_BLACK (0 << 4)
|
||||
#define SOS_X86_VIDEO_BG_BLUE (1 << 4)
|
||||
#define SOS_X86_VIDEO_BG_GREEN (2 << 4)
|
||||
#define SOS_X86_VIDEO_BG_CYAN (3 << 4)
|
||||
#define SOS_X86_VIDEO_BG_RED (4 << 4)
|
||||
#define SOS_X86_VIDEO_BG_MAGENTA (5 << 4)
|
||||
#define SOS_X86_VIDEO_BG_BROWN (6 << 4)
|
||||
#define SOS_X86_VIDEO_BG_LTGRAY (7 << 4)
|
||||
/* Blinking */
|
||||
#define SOS_X86_VIDEO_FG_BLINKING (1 << 7)
|
||||
|
||||
|
||||
/** Setup the video RAM mapping and clear the screen */
|
||||
sos_ret_t sos_x86_videomem_setup(void);
|
||||
|
||||
/** Clears the screen and set the background color as given by
|
||||
attribute */
|
||||
sos_ret_t sos_x86_videomem_cls(unsigned char attribute);
|
||||
|
||||
/** Print the string on the scren with the given attribute. Does not
|
||||
handle scrolling */
|
||||
sos_ret_t sos_x86_videomem_putstring(unsigned char row, unsigned char col,
|
||||
unsigned char attribute,
|
||||
const char *str);
|
||||
|
||||
/** Print the character on the scren with the given attribute. Does not
|
||||
handle scrolling */
|
||||
sos_ret_t sos_x86_videomem_putchar(unsigned char row, unsigned char col,
|
||||
unsigned char attribute,
|
||||
unsigned char c);
|
||||
|
||||
/**
|
||||
* Print the formatted string. Very restricted version of printf(3):
|
||||
* 1/ can print max 255 chars, 2/ supports only %d/%i, %c, %s, %x
|
||||
* without any support for flag charachters (eg %08x).
|
||||
*/
|
||||
sos_ret_t sos_x86_videomem_printf(unsigned char row, unsigned char col,
|
||||
unsigned char attribute,
|
||||
const char *format, /* args */...)
|
||||
__attribute__ ((format (printf, 4, 5)));
|
||||
|
||||
#endif /* _SOS_X86_VIDEOMEM_H_ */
|
||||
@ -0,0 +1,73 @@
|
||||
|
||||
Contents of the extra/ directory
|
||||
================================
|
||||
|
||||
Data and configuration files to support generation of sos on non-x86
|
||||
and/or grub-less hosts:
|
||||
- dot.mkvars: file to copy as .mkvars in the root directory to
|
||||
compile on a non-x86 host, and to generate the grub floppy image on
|
||||
a grub-less host
|
||||
- grub.img.gz: compressed image of a Grub floppy (without any
|
||||
kernel). Used by dot.mkvars.
|
||||
- mtoolsrc: file needed by .mkvars to compile a the floppy image
|
||||
|
||||
Support of a sos-specific boot sector:
|
||||
- Makefile: rules to compile sos_bsect.img, the floppy image with the
|
||||
boot sector and the Sos
|
||||
- bootsect.S: x86 Sos boot sector (GNU as). Depends on sos_bsect.lds
|
||||
- sos_bsect.lds: ld script to bind the boot sector with the remaining
|
||||
of the kernel
|
||||
|
||||
Misc:
|
||||
- qemu-port-e9.diff: patch over qemu to support the bochs "port 0xe9 hack"
|
||||
|
||||
|
||||
What you can do with these files
|
||||
================================
|
||||
|
||||
|
||||
*** Compile SOS from another architecture:
|
||||
------------------------------------------
|
||||
- compile a cross-compiler for the i586-gnu target. This involves
|
||||
compiling the binutils and gcc. Here are example configuration
|
||||
options for them:
|
||||
binutils (replace sparc-cun-solaris with your arch):
|
||||
../binutils-2.13/configure --prefix=/udd/ddecotig/temp_dd/xgcc/host-sparc-solaris7/stow/binutils-2.11 --host=sparc-sun-solaris2.7 i586-gnu
|
||||
make && make install
|
||||
gcc (ditto):
|
||||
CFLAGS="-O2 -Dinhibit_libc" ../gcc-3.2/configure --target=i586-gnu --prefix=/udd/ddecotig/temp_dd/xgcc/host-sparc-solaris7/stow/gcc-3.2 --with-as=/udd/ddecotig/temp_dd/xgcc/host-sparc-solaris7/bin/as --with-ld=/udd/ddecotig/temp_dd/xgcc/host-sparc-solaris7/bin/ld --with-gnu-as --with-gnu-ld --enable-languages=c --disable-shared --disable-multilib --disable-nls --enable-threads=single
|
||||
make && make install
|
||||
- compile the mtools
|
||||
- copy dot.mkvars to the root directory of SOS, as ".mkvars"
|
||||
- customize the CC/LD/... variables to suit your cross-compiler
|
||||
installatioon
|
||||
- now you may run make from the SOS root directory, it should
|
||||
generate the Grub boot floppy image. The following warning is
|
||||
normal:
|
||||
.mkvars:16: attention : รฉcrasement des commandes pour la cible ยซ grub-sos.img ยป
|
||||
Makefile:92: attention : anciennes commandes ignorรฉes pour la cible ยซ grub-sos.img ยป
|
||||
|
||||
|
||||
*** To compile SOS from an x86 where grub is not or incorrectly installed:
|
||||
--------------------------------------------------------------------------
|
||||
- copy dot.mkvars to the root directory of SOS, as ".mkvars"
|
||||
- customize the CC/LD/... variables to suit your cross-compiler
|
||||
installatioon
|
||||
- now you may run make from the SOS root directory, it should
|
||||
generate the Grub boot floppy image. The following warning is
|
||||
normal:
|
||||
.mkvars:16: attention : รฉcrasement des commandes pour la cible ยซ grub-sos.img ยป
|
||||
Makefile:92: attention : anciennes commandes ignorรฉes pour la cible ยซ grub-sos.img ยป
|
||||
|
||||
|
||||
*** To compile SOS with its own bootloader:
|
||||
-------------------------------------------
|
||||
- for cross-architecture compilation: see above
|
||||
- cd to this extra/ directory
|
||||
- run 'make'
|
||||
- the floppy image is: sos_bsect.img
|
||||
NOTE : SOS will not boot correctly this way after article 2 !
|
||||
|
||||
|
||||
--
|
||||
David Decotigny
|
||||
@ -0,0 +1,406 @@
|
||||
|
||||
/*
|
||||
* @(#) $Id: bootsect.S,v 1.8 2004/11/20 16:00:11 d2 Exp $
|
||||
* Description : Bootsecteur en syntaxe AT&T
|
||||
* Auteurs : Thomas Petazzoni & Fabrice Gautier & Emmanuel Marty
|
||||
* Jerome Petazzoni & Bernard Cassagne & coffeeman
|
||||
* David Decotigny
|
||||
* Bug reports to kos-misc@enix.org
|
||||
*/
|
||||
|
||||
/*
|
||||
* But global de ce bootsecteur :
|
||||
*
|
||||
* - Initialiser la becane
|
||||
* - Charger le kernel
|
||||
* - Passer en mode protege
|
||||
* - Executer le kernel
|
||||
*
|
||||
* Taille restante : Je vous rappelle qu'un bootsecteur ne peut faire
|
||||
* qu'au maximum 512 octets dont 2 octets obligatoires 0xAA55. Sur
|
||||
* les 510 octets reellement utilisables, il reste 3 octets dispo (60
|
||||
* si on decide d'enlever le BPB un jour) !!!
|
||||
*
|
||||
* thomas_petazzoni : - detection des codes d'erreurs de chargement
|
||||
* David_Decotigny : - Passage en GNU as
|
||||
* David_Decotigny : - Chargement du noyau au-dela du 1er Mega (taille
|
||||
* max = 0x9e000 octets = 632ko), pour avoir le
|
||||
* meme noyau sous grub et avec le bootsecteur
|
||||
*/
|
||||
|
||||
/*
|
||||
* Sequence d'operations :
|
||||
* - Le BIOS charge le bootsect en 0x7c00 (BOOT_ADRESS). On choisit
|
||||
* la representation 0x7c0:0000 pour que le .org 0 reste valide
|
||||
* - Le bootsect se deplace de lui-meme en 0x9f000 (COPY_ADRESS). On
|
||||
* choisit la representation 0x9f00:0000 pour que le .org 0 reste
|
||||
* valide
|
||||
* - Le bootsect verifie que le processeur est du type 386+
|
||||
* - Il charge le noyau depuis la disquette en memoire a partir de
|
||||
* 0x1000 (LOAD_ADRESS). Le noyau peut au max tenir sur
|
||||
* SECTORS_TO_LOAD secteurs
|
||||
* - Il passe en pmode flat (apres ouverture a20)
|
||||
* - Il recopie le noyau (situe en LOAD_ADRESS) vers son adresse
|
||||
* finale (FINAL_ADDRESS = 2Mo). La recopie se fait sur tout l'espace
|
||||
* LOAD_ADRESS ---> COPY_ADRESS, c'est a dire sur 0x9e000 octets =
|
||||
* 632ko. Le noyau peut donc au max faire 632ko. Le nombre max de
|
||||
* secteurs de disquette qu'on peut charger est donc 1264
|
||||
*/
|
||||
|
||||
|
||||
/* La taille de la pile */
|
||||
#define BOOT_STACK_SIZE 0x4000
|
||||
|
||||
.file "bootsect.S"
|
||||
|
||||
/* Tout est place dans une seule section */
|
||||
.section ".bootsect"
|
||||
|
||||
/* L'essentiel du bootsector (sauf les 1eres instructions)
|
||||
sont a un offset 0. On fait en sorte que le compilo soit
|
||||
d'accord la-dessus. Quand on a des adresse realm exotiques
|
||||
(0x7c00, 0x9f000, ...), on s'arrange toujours pour avoir un
|
||||
offset de 0 => on choisira le segment adapte (0x7c0,
|
||||
0x9f00, ...). Il ne faut pas oublier le ld -Ttext 0 */
|
||||
.org 0
|
||||
|
||||
/* Pour que gas genere du 16bits, afin que ca marche en realm */
|
||||
.code16
|
||||
|
||||
#define SECTORS_TO_LOAD 128 /* 64 ko */ /* MAX=1264 */
|
||||
|
||||
/*
|
||||
* Parametres de la disquette. Comme c'est chiant de faire une
|
||||
* procedure de detection auto, et que ca prend de la place, on fait
|
||||
* ca "a la main". Par exemple, une DD 720 Ko a 9 secteurs/piste, une
|
||||
* 1.44 Mo a 18 secteurs/pistes
|
||||
*/
|
||||
#define CYLS 80
|
||||
#define HEADS 1
|
||||
#define SECTS 18
|
||||
|
||||
#define BOOT_ADRESS 0x07C00 /* Adresse de demarrage (lineaire) */
|
||||
#define BOOT_SEG (BOOT_ADRESS>>4) /* Segment de Boot */
|
||||
#define BOOT_SIZE 512 /* Taille bu bootsecteur */
|
||||
#define COPY_ADRESS 0x9F000 /* La ou on va copier le
|
||||
bootsecteur (lineaire) */
|
||||
#define COPY_SEG (COPY_ADRESS>>4) /* Segment de la ou on va
|
||||
copier le bootsecteur */
|
||||
#define LOAD_ADRESS 0x01000 /* 1er chargement du systeme */
|
||||
#define LOAD_SEG (LOAD_ADRESS>>4) /* Segment du 1er chargement du */
|
||||
#define MAX_KERN_LEN COPY_ADRESS-LOAD_ADRESS /* Taille noyau maxi */
|
||||
|
||||
/* IMPORTANT : Cette valeur DOIT etre identique a l'adresse presente
|
||||
dans sos.lds ! */
|
||||
#define FINAL_ADDRESS 0x200000 /* Adresse finale (physique de 0 a 4G)
|
||||
ou est charge le noyau */
|
||||
|
||||
#define OP16 .byte 0x66 ;
|
||||
#define OP32 .byte 0x66 ;
|
||||
|
||||
/*
|
||||
* Procedure qui vide le buffer clavier.
|
||||
*/
|
||||
#define WAITKB \
|
||||
1: ;\
|
||||
.word 0xeb ;\
|
||||
.word 0xeb ;\
|
||||
inb $0x64, %al ;\
|
||||
andb $0x2, %al ;\
|
||||
jnz 1b
|
||||