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‎README.md

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# kernel_basic_system
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Kernel Basic System (C codes).
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================================================================================
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The README is used to introduce the tool and provide instructions on
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how to install the tool, any machine dependencies it may have (for
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example C compilers and installed libraries) and any other information
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that should be provided before the tool is installed.
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INSTALLATION
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To install this tool type the following:
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* Generate iso image file
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* Generate new Virtual Machine (by VirtualBox) and add iso file
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* Type command make run (testing)
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and follow instructions.
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DEPENDENCIES
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This tool requires these other modules and libraries:
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None
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COPYRIGHT AND LICENCE
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Copyright (C) 2017 by https://github.com/vroncevic/kernel_basic_system
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This tool is free software; you can redistribute it and/or modify it.
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![alt tag](https://raw.githubusercontent.com/vroncevic/kernel_basic_system/master/cc++_logo.jpg)
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![alt tag](https://raw.githubusercontent.com/vroncevic/kernel_basic_system/master/linux_logo.jpg)
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‎cc++_logo.jpg

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‎linux_logo.jpg

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‎src/.editorconfig

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[*]
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indent_style = tab
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tab_width = 4

‎src/Makefile

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#
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# @brief Main entry point of make process
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# @version ver.1.0
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# @date Sun May 21 22:11:00 CEST 2017
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# @company None, free software to use 2017
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# @author Vladimir Roncevic <elektron.ronca@gmail.com>
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#
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include compiler.mk
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include assembler.mk
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include linker.mk
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include objects.mk
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all: $(OBJECTS) kernel.bin kernel.iso
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%.o: %.c
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@echo
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@echo Compiling module $<
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gcc $(GCC_FLAGS) -o $@ -c $<
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loader.o: loader.asm
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@echo
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@echo Compiling module $<
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nasm $(NASM_FLAGS) -o $@ $<
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kernel.bin: link.ld
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@echo
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@echo Linking modules
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ld $(LD_FLAGS) -T $< -o $@ $(OBJECTS)
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kernel.iso: kernel.bin
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@echo
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@mkdir iso
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@mkdir iso/boot
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@mkdir iso/boot/grub
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@cp $< iso/boot/$<
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@echo 'set timeout=0' > iso/boot/grub/grub.cfg
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@echo 'set default=0' >> iso/boot/grub/grub.cfg
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@echo '' >> iso/boot/grub/grub.cfg
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@echo 'menuentry "MyOS" {' >> iso/boot/grub/grub.cfg
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@echo ' multiboot /boot/kernel.bin' >> iso/boot/grub/grub.cfg
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@echo ' boot' >> iso/boot/grub/grub.cfg
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@echo '}' >> iso/boot/grub/grub.cfg
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grub-mkrescue --output=$@ iso
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@chmod 755 $@
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@rm -rf iso
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run: kernel.iso
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@echo
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(killall VirtualBox && sleep 1) || true
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VirtualBox --startvm "MyOS" &
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@echo
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clean:
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@echo
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rm -f $(OBJECTS) *.bin *.iso
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@echo
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‎src/assembler.mk

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#
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# @brief Assembly flags
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# @version ver.1.0
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# @date Sun May 21 22:11:00 CEST 2017
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# @company None, free software to use 2017
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# @author Vladimir Roncevic <elektron.ronca@gmail.com>
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#
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NASM_FLAGS = -f elf32
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‎src/compiler.mk

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#
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# @brief Compiler flags
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# @version ver.1.0
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# @date Sun May 21 22:11:00 CEST 2017
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# @company None, free software to use 2017
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# @author Vladimir Roncevic <elektron.ronca@gmail.com>
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#
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GCC_FLAGS = \
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-m32 \
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-Wall \
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-O \
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-fleading-underscore \
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-fstrength-reduce \
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-fomit-frame-pointer \
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-finline-functions \
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-nostdinc \
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-fno-builtin
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‎src/gdt.h

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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*- */
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/*
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* gdt.h
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* Copyright (C) 2017 Vladimir Roncevic <elektron.ronca@gmail.com>
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*
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* kernel is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* kernel is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the 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 along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __GDT_H
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#define __GDT_H
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#include "types.h"
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struct gdt_entry {
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uint16_t limit_low;
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uint16_t base_low;
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uint8_t base_middle;
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uint8_t access;
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uint8_t granularity;
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uint8_t base_high;
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} __attribute__((packed));
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struct gdt_ptr {
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uint16_t limit;
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uint32_t base;
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} __attribute__((packed));
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extern struct gdt_entry gdt[3];
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extern struct gdt_ptr gp;
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extern void gdt_set_gate(int32_t num, uint64_t base, uint64_t limit, uint8_t access, uint8_t gran);
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extern void gdt_install(void);
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extern void gdt_flush();
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#endif
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‎src/gdt_install.c

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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*- */
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/*
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* gdt_install.c
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* Copyright (C) 2017 Vladimir Roncevic <elektron.ronca@gmail.com>
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*
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* kernel is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* kernel is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the 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 along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "gdt.h"
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void gdt_install(void) {
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gp.limit = (sizeof(struct gdt_entry) * 3) - 1;
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gp.base = (uint32_t)&gdt;
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gdt_set_gate(0, 0, 0, 0, 0);
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gdt_set_gate(1, 0, 0xFFFFFFFF, 0x9A, 0xCF);
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gdt_set_gate(2, 0, 0xFFFFFFFF, 0x92, 0xCF);
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gdt_flush();
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}
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‎src/gdt_set_gate.c

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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*- */
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/*
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* gdt_set_gate.c
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* Copyright (C) 2017 Vladimir Roncevic <elektron.ronca@gmail.com>
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*
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* kernel is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* kernel is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the 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 along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "gdt.h"
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struct gdt_entry gdt[3];
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struct gdt_ptr gp;
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void gdt_set_gate(int32_t num, uint64_t base, uint64_t limit, uint8_t access, uint8_t gran) {
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gdt[num].base_low = (base & 0xFFFF);
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gdt[num].base_middle = (base >> 16) & 0xFF;
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gdt[num].base_high = (base >> 24) & 0xFF;
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gdt[num].limit_low = (limit & 0xFFFF);
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gdt[num].granularity = ((limit >> 16) & 0x0F);
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gdt[num].granularity |= (gran & 0xF0);
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gdt[num].access = access;
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}
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‎src/idt.h

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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*- */
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/*
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* idt.h
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* Copyright (C) 2017 Vladimir Roncevic <elektron.ronca@gmail.com>
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*
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* kernel is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* kernel is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the 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 along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __IDT_H
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#define __IDT_H
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#include "types.h"
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struct idt_entry {
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uint16_t base_lo;
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uint16_t sel;
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uint8_t always0;
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uint8_t flags;
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uint16_t base_hi;
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} __attribute__((packed));
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struct idt_ptr {
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uint16_t limit;
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uint32_t base;
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} __attribute__((packed));
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extern struct idt_entry idt[256];
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extern struct idt_ptr idtp;
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extern void idt_set_gate(
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uint8_t num, uint64_t base, uint16_t sel, uint8_t flags
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);
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extern void idt_load(void);
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extern void idt_install(void);
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#endif
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‎src/idt_install.c

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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*- */
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/*
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* idt_install.c
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* Copyright (C) 2017 Vladimir Roncevic <elektron.ronca@gmail.com>
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*
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* kernel is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* kernel is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the 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 along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "idt.h"
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#include "memory.h"
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struct idt_entry idt[256];
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struct idt_ptr idtp;
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void idt_install(void) {
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idtp.limit = (sizeof(struct idt_entry) * 256) - 1;
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idtp.base = (uint32_t)&idt;
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memset(&idt, 0, sizeof(struct idt_entry) * 256);
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idt_load();
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}
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‎src/idt_set_gate.c

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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*- */
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/*
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* idt_set_gate.c
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* Copyright (C) 2017 Vladimir Roncevic <elektron.ronca@gmail.com>
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*
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* kernel is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* kernel is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the 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 along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "idt.h"
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void idt_set_gate(uint8_t num, uint64_t base, uint16_t sel, uint8_t flags) {
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idt[num].base_lo = (base & 0xFFFF);
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idt[num].base_hi = (base >> 16) & 0xFFFF;
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idt[num].sel = sel;
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idt[num].always0 = 0;
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idt[num].flags = flags;
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}
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‎src/inportb.c

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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*- */
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/*
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* inportb.c
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* Copyright (C) 2017 Vladimir Roncevic <elektron.ronca@gmail.com>
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*
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* kernel is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* kernel is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the 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 along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "port_io.h"
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uint8_t inportb(uint16_t _port) {
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uint8_t rv;
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__asm__ __volatile__ ("inb %1, %0" : "=a" (rv) : "dN" (_port));
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return rv;
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}
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