Initial commit

This commit is contained in:
Furkan Mudanyali 2022-07-18 09:59:04 +03:00
commit 9d6a8a3df4
35 changed files with 724 additions and 0 deletions

7
build.sh Executable file
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#!/bin/sh
set -e
. ./headers.sh
for PROJECT in $PROJECTS; do
(cd $PROJECT && DESTDIR="$SYSROOT" $MAKE install)
done

11
clean.sh Executable file
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#!/bin/sh
set -e
. ./config.sh
for PROJECT in $PROJECTS; do
(cd $PROJECT && $MAKE clean)
done
rm -rf sysroot
rm -rf isodir
rm -rf rockos.iso

28
config.sh Executable file
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SYSTEM_HEADER_PROJECTS="libc kernel"
PROJECTS="libc kernel"
export MAKE=${MAKE:-make}
export HOST=${HOST:-$(./default-host.sh)}
export AR=${HOST}-ar
export AS=${HOST}-as
export CC=${HOST}-gcc
export PREFIX=/usr
export EXEC_PREFIX=$PREFIX
export BOOTDIR=/boot
export LIBDIR=$EXEC_PREFIX/lib
export INCLUDEDIR=$PREFIX/include
export CFLAGS='-O3 -g'
export CPPFLAGS=''
# Configure the cross-compiler to use the desired system root.
export SYSROOT="$(pwd)/sysroot"
export CC="$CC --sysroot=$SYSROOT"
# Work around that the -elf gcc targets doesn't have a system include directory
# because it was configured with --without-headers rather than --with-sysroot.
if echo "$HOST" | grep -Eq -- '-elf($|-)'; then
export CC="$CC -isystem=$INCLUDEDIR"
fi

2
default-host.sh Executable file
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#!/bin/sh
echo i686-elf

9
headers.sh Executable file
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#!/bin/sh
set -e
. ./config.sh
mkdir -p "$SYSROOT"
for PROJECT in $SYSTEM_HEADER_PROJECTS; do
(cd $PROJECT && DESTDIR="$SYSROOT" $MAKE install-headers)
done

15
iso.sh Executable file
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#!/bin/sh
set -e
. ./build.sh
mkdir -p isodir
mkdir -p isodir/boot
mkdir -p isodir/boot/grub
cp sysroot/boot/rockos.kernel isodir/boot/rockos.kernel
cat > isodir/boot/grub/grub.cfg << EOF
menuentry "rockOS" {
multiboot /boot/rockos.kernel
}
EOF
grub2-mkrescue -o rockos.iso isodir

3
kernel/.gitignore vendored Normal file
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*.d
*.kernel
*.o

83
kernel/Makefile Normal file
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DEFAULT_HOST!=../default-host.sh
HOST?=DEFAULT_HOST
HOSTARCH!=../target-triplet-to-arch.sh $(HOST)
CFLAGS?=-O3 -g
CPPFLAGS?=
LDFLAGS?=
LIBS?=
DESTDIR?=
PREFIX?=/usr/local
EXEC_PREFIX?=$(PREFIX)
BOOTDIR?=$(EXEC_PREFIX)/boot
INCLUDEDIR?=$(PREFIX)/include
CFLAGS:=$(CFLAGS) -ffreestanding -Wall -Wextra
CPPFLAGS:=$(CPPFLAGS) -D__is_kernel -Iinclude
LDFLAGS:=$(LDFLAGS)
LIBS:=$(LIBS) -nostdlib -lk -lgcc
ARCHDIR=arch/$(HOSTARCH)
include $(ARCHDIR)/make.config
CFLAGS:=$(CFLAGS) $(KERNEL_ARCH_FLAGS)
CPPFLAGS:=$(CPPFLAGS) $(KERNEL_ARCH_CPPFLAGS)
LDFLAGS:=$(LDFLAGS) $(KERNEL_ARCH_LDFLAGS)
LIBS:=$(LIBS) $(KERNEL_ARCH_LIBS)
KERNEL_OBJS=\
$(KERNEL_ARCH_OBJS) \
kernel/kernel.o \
OBJS=\
$(ARCHDIR)/crti.o \
$(ARCHDIR)/crtbegin.o \
$(KERNEL_OBJS) \
$(ARCHDIR)/crtend.o \
$(ARCHDIR)/crtn.o \
LINK_LIST=\
$(LDFLAGS) \
$(ARCHDIR)/crti.o \
$(ARCHDIR)/crtbegin.o \
$(KERNEL_OBJS) \
$(LIBS) \
$(ARCHDIR)/crtend.o \
$(ARCHDIR)/crtn.o \
.PHONY: all clean install install-headers install-kernel
.SUFFIXES: .o .c .S
all: rockos.kernel
rockos.kernel: $(OBJS) $(ARCHDIR)/linker.ld
$(CC) -T $(ARCHDIR)/linker.ld -o $@ $(CFLAGS) $(LINK_LIST)
grub2-file --is-x86-multiboot rockos.kernel
$(ARCHDIR)/crtbegin.o $(ARCHDIR)/crtend.o:
OBJ=`$(CC) $(CFLAGS) $(LDFLAGS) -print-file-name=$(@F)` && cp "$$OBJ" $@
.c.o:
$(CC) -MD -c $< -o $@ -std=gnu11 $(CFLAGS) $(CPPFLAGS)
.S.o:
$(CC) -MD -c $< -o $@ $(CFLAGS) $(CPPFLAGS)
clean:
rm -f rockos.kernel
rm -f $(OBJS) *.o */*.o */*/*.o
rm -f $(OBJS:.o=.d) *.d */*.d */*/*.d
install: install-headers install-kernel
install-headers:
mkdir -p $(DESTDIR)$(INCLUDEDIR)
cp -R --preserve=timestamps include/. $(DESTDIR)$(INCLUDEDIR)/.
install-kernel: rockos.kernel
mkdir -p $(DESTDIR)$(BOOTDIR)
cp rockos.kernel $(DESTDIR)$(BOOTDIR)
-include $(OBJS:.o=.d)

34
kernel/arch/i386/boot.S Normal file
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# Declare constants for multiboot header
.set ALIGN, 1<<0 # align loaded modules on page boundaries
.set MEMINFO, 1<<1 # provide memory map
.set FLAGS, ALIGN | MEMINFO # multiboot flag field
.set MAGIC, 0x1BADB002 # magic number for bootloader to find header
.set CHECKSUM, -(MAGIC + FLAGS) # checksum of above
# Declare header in multiboot standard
.section .multiboot
.align 4
.long MAGIC
.long FLAGS
.long CHECKSUM
# Reserve a stack for initial thread
.section .bss
.align 16
stack_bottom:
.skip 16384 # 16 KiB
stack_top:
# kernel entry point
.section .text
.global _start
.type _start, @function
_start:
movl $stack_top, %esp
call _init # call global constructors
call kernel_main # transfer control to main kernel
# Hang if kernel_main unexpectedly returns
cli
1: hlt
jmp 1b
.size _start, . - _start

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kernel/arch/i386/crti.S Normal file
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.section .init
.global _init
.type _init, @function
_init:
push %ebp
movl %esp, %ebp
.section .fini
.global _fini
.type _fini, @function
_fini:
push %ebp
movl %esp, %ebp

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kernel/arch/i386/crtn.S Normal file
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.section .init
popl %ebp
ret
.section .fini
popl %ebp
ret

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ENTRY(_start)
SECTIONS
{
. = 1M;
.text BLOCK(4K) : ALIGN(4K)
{
*(.multiboot)
*(.text)
}
.rodata BLOCK(4K) : ALIGN(4K)
{
*(.rodata)
}
.data BLOCK(4K) : ALIGN(4K)
{
*(.data)
}
.bss BLOCK(4K) : ALIGN(4K)
{
*(COMMON)
*(.bss)
}
}

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KERNEL_ARCH_CFLAGS=
KERNEL_ARCH_CPPFLAGS=
KERNEL_ARCH_LDFLAGS=
KERNEL_ARCH_LIBS=
KERNEL_ARCH_OBJS=\
$(ARCHDIR)/boot.o \
$(ARCHDIR)/tty.o \

62
kernel/arch/i386/tty.c Normal file
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#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <kernel/tty.h>
#include "vga.h"
static const size_t VGA_WIDTH = 80;
static const size_t VGA_HEIGHT = 25;
static uint16_t* const VGA_MEMORY = (uint16_t*) 0xB8000;
static size_t terminal_row;
static size_t terminal_column;
static uint8_t terminal_color;
static uint16_t* terminal_buffer;
void terminal_initialize(void) {
terminal_row = 0;
terminal_column = 0;
terminal_color = vga_entry_color(VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK);
terminal_buffer = VGA_MEMORY;
for (size_t y = 0; y < VGA_HEIGHT; y++) {
for (size_t x = 0; x < VGA_WIDTH; x++) {
const size_t index = y * VGA_WIDTH + x;
terminal_buffer[index] = vga_entry(' ', terminal_color);
}
}
}
void terminal_setcolor(uint8_t color) {
terminal_color = color;
}
void terminal_putentryat(unsigned char c, uint8_t color, size_t x, size_t y) {
const size_t index = y * VGA_WIDTH + x;
terminal_buffer[index] = vga_entry(c, color);
}
void terminal_putchar(char c) {
unsigned char uc = c;
terminal_putentryat(uc, terminal_color, terminal_column, terminal_row);
if (++terminal_column == VGA_WIDTH) {
terminal_column = 0;
if (++terminal_row == VGA_HEIGHT) {
terminal_row = 0;
}
}
}
void terminal_write(const char* data, size_t size) {
for (size_t i = 0; i < size; i++) {
terminal_putchar(data[i]);
}
}
void terminal_writestring(const char* data) {
terminal_write(data, strlen(data));
}

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kernel/arch/i386/vga.h Normal file
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#ifndef ARCH_I386_VGA_H
#define ARCH_I386_VGA_H
#include <stdint.h>
enum vga_color {
VGA_COLOR_BLACK = 0,
VGA_COLOR_BLUE = 1,
VGA_COLOR_GREEN = 2,
VGA_COLOR_CYAN = 3,
VGA_COLOR_RED = 4,
VGA_COLOR_MAGENTA = 5,
VGA_COLOR_BROWN = 6,
VGA_COLOR_LIGHT_GREY = 7,
VGA_COLOR_DARK_GREY = 8,
VGA_COLOR_LIGHT_BLUE = 9,
VGA_COLOR_LIGHT_GREEN = 10,
VGA_COLOR_LIGHT_CYAN = 11,
VGA_COLOR_LIGHT_RED = 12,
VGA_COLOR_LIGHT_MAGENTA = 13,
VGA_COLOR_LIGHT_BROWN = 14,
VGA_COLOR_WHITE = 15,
};
static inline uint8_t vga_entry_color(enum vga_color fg, enum vga_color bg) {
return fg | bg << 4;
}
static inline uint16_t vga_entry(unsigned char uc, uint8_t color) {
return (uint16_t) uc | (uint16_t) color << 8;
}
#endif

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#ifndef _KERNEL_TTY_H
#define _KERNEL_TTY_H
#include <stddef.h>
void terminal_initialize(void);
void terminal_putchar(char c);
void terminal_write(const char* data, size_t size);
void terminal_writestring(const char* data);
#endif

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kernel/kernel/kernel.c Normal file
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#include <stdio.h>
#include <kernel/tty.h>
void kernel_main(void) {
terminal_initialize();
printf("Hello, kernel World!\n");
}

3
libc/.gitignore vendored Normal file
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*.a
*.d
*.o

93
libc/Makefile Normal file
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DEFAULT_HOST!=../default-host.sh
HOST?=DEFAULT_HOST
HOSTARCH!=../target-triplet-to-arch.sh $(HOST)
CFLAGS?=-O3 -g
CPPFLAGS?=
LDFLAGS?=
LIBS?=
DESTDIR?=
PREFIX?=/usr/local
EXEC_PREFIX?=$(PREFIX)
INCLUDEDIR?=$(PREFIX)/include
LIBDIR?=$(EXEC_PREFIX)/lib
CFLAGS:=$(CFLAGS) -ffreestanding -Wall -Wextra
CPPFLAGS:=$(CPPFLAGS) -D__is_libc -Iinclude
LIBK_CFLAGS:=$(CFLAGS)
LIBK_CPPFLAGS:=$(CPPFLAGS) -D__is_libk
ARCHDIR=arch/$(HOSTARCH)
include $(ARCHDIR)/make.config
CFLAGS:=$(CFLAGS) $(ARCH_CFLAGS)
CPPFLAGS:=$(CPPFLAGS) $(ARCH_CPPFLAGS)
LIBK_CFLAGS:=$(LIBK_CFLAGS) $(KERNEL_ARCH_CFLAGS)
LIBK_CPPFLAGS:=$(LIBK_CPPFLAGS) $(KERNEL_ARCH_CPPFLAGS)
FREEOBJS=\
$(ARCH_FREEOBJS) \
stdio/printf.o \
stdio/putchar.o \
stdio/puts.o \
stdlib/abort.o \
string/memcmp.o \
string/memcpy.o \
string/memmove.o \
string/memset.o \
string/strlen.o \
HOSTEDOBJS=\
$(ARCH_HOSTEDOBJS) \
OBJS=\
$(FREEOBJS) \
$(HOSTEDOBJS) \
LIBK_OBJS=$(FREEOBJS:.o=.libk.o)
#BINARIES=libc.a libk.a # Not ready for libc yet.
BINARIES=libk.a
.PHONY: all clean install install-headers install-libs
.SUFFIXES: .o .libk.o .c .S
all: $(BINARIES)
libc.a: $(OBJS)
$(AR) rcs $@ $(OBJS)
libk.a: $(LIBK_OBJS)
$(AR) rcs $@ $(LIBK_OBJS)
.c.o:
$(CC) -MD -c $< -o $@ -std=gnu11 $(CFLAGS) $(CPPFLAGS)
.c.S:
$(CC) -MD -c $< -o $@ $(CFLAGS) $(CPPFLAGS)
.c.libk.o:
$(CC) -MD -c $< -o $@ -std=gnu11 $(LIBK_CFLAGS) $(LIBK_CPPFLAGS)
.S.libk.o:
$(CC) -MD -c $< -o $@ $(LIBK_CFLAGS) $(LIBK_CPPFLAGS)
clean:
rm -f $(BINARIES) *.a
rm -f $(OBJS) $(LIBK_OBJS) *.o */*.o */*/*.o
rm -f $(OBJS:.o=.d) $(LIBK_OBJS:.o=.d) *.d */*.d */*/*.d
install: install-headers install-libs
install-headers:
mkdir -p $(DESTDIR)$(INCLUDEDIR)
cp -R --preserve=timestamps include/. $(DESTDIR)$(INCLUDEDIR)/.
install-libs: $(BINARIES)
mkdir -p $(DESTDIR)$(LIBDIR)
cp $(BINARIES) $(DESTDIR)$(LIBDIR)
-include $(OBJS:.o=.d)
-include $(LIBK_OBJS:.o=.d)

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ARCH_CFLAGS=
ARCH_CPPFLAGS=
KERNEL_ARCH_CFLAGS=
KERNEL_ARCH_CPPFLAGS=
ARCH_FREEOBJS=\
ARCH_HOSTEDOBJS=\

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libc/include/stdio.h Normal file
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#ifndef _STDIO_H
#define _STDIO_H 1
#include <sys/cdefs.h>
#define EOF (-1)
#ifdef __cplusplus
extern "C" {
#endif
int printf(const char* __restrict, ...);
int putchar(int);
int puts(const char*);
#ifdef __cplusplus
}
#endif
#endif

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libc/include/stdlib.h Normal file
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#ifndef _STDLIB_H
#define _STDLIB_H 1
#include <sys/cdefs.h>
#ifdef __cplusplus
extern "C" {
#endif
__attribute__((__noreturn__))
void abort(void);
#ifdef __cplusplus
}
#endif
#endif

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libc/include/string.h Normal file
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#ifndef _STRING_H
#define _STRING_H 1
#include <sys/cdefs.h>
#include <stddef.h>
#ifdef __cplusplus
extern "C" {
#endif
int memcmp(const void*, const void*, size_t);
void* memcpy(void* __restrict, const void* __restrict, size_t);
void* memmove(void*, const void*, size_t);
void* memset(void*, int, size_t);
size_t strlen(const char*);
#ifdef __cplusplus
}
#endif
#endif

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libc/include/sys/cdefs.h Normal file
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#ifndef _SYS_CDEFS_H
#define _SYS_CDEFS_H 1
#define __rockos_libc 1
#endif

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libc/stdio/printf.c Normal file
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#include <limits.h>
#include <stdbool.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
static bool print(const char* data, size_t length) {
const unsigned char* bytes = (const unsigned char*) data;
for (size_t i = 0; i < length; i++) {
if (putchar(bytes[i]) == EOF) {
return false;
}
}
return true;
}
int printf(const char* restrict format, ...) {
va_list parameters;
va_start(parameters, format);
int written = 0;
while (*format != '\0') {
size_t maxrem = INT_MAX - written;
if (format[0] != '%' || format[1] == '%') {
if (format[0] == '%') {
format++;
}
size_t amount = 1;
while (format[amount] && format[amount] != '%') {
amount++;
}
if (maxrem < amount) {
// TODO: Set errno to EOVERFLOW.
return -1;
}
if (!print(format, amount)) {
return -1;
}
format += amount;
written += amount;
continue;
}
const char* format_begun_at = format++;
if (*format == 'c') {
format++;
char c = (char) va_arg(parameters, int);
if (!maxrem) {
// TODO: Set errno to EOVERFLOW
return -1;
}
if (!print(&c, sizeof(c))) {
return -1;
}
written++;
} else if (*format == 's') {
format ++;
const char* str = va_arg(parameters, const char*);
size_t len = strlen(str);
if (maxrem < len) {
// TODO: Set errno to EOVERFLOW
return -1;
}
if (!print(str, len)) {
return -1;
}
written += len;
} else {
format = format_begun_at;
size_t len = strlen(format);
if (maxrem < len) {
// TODO: Set errno to EOVERFLOW
return -1;
}
if (!print(format, len)) {
return -1;
}
written += len;
format += len;
}
}
va_end(parameters);
return written;
}

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libc/stdio/putchar.c Normal file
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#include <stdio.h>
#if defined(__is_libk)
#include <kernel/tty.h>
#endif
int putchar(int ic) {
#if defined(__is_libk)
char c = (char) ic;
terminal_write(&c, sizeof(c));
#else
// TODO: Implement stdio and the write system call.
#endif
return ic;
}

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libc/stdio/puts.c Normal file
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#include <stdio.h>
int puts(const char* string) {
return printf("%s\n", string);
}

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libc/stdlib/abort.c Normal file
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#include <stdio.h>
#include <stdlib.h>
__attribute__((__noreturn__))
void abort(void) {
#if defined(__is_libk)
// TODO: Add proper kernel panic.
printf("kernel: panic: abort()\n");
asm volatile("hlt");
#else
// TODO: Abnormally terminate the process as if by SIGABRT.
printf("abort()\n");
#endif
while (1) {}
__builtin_unreachable();
}

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libc/string/memcmp.c Normal file
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#include <string.h>
int memcmp(const void* aptr, const void* bptr, size_t size) {
const unsigned char* a = (const unsigned char*) aptr;
const unsigned char* b = (const unsigned char*) bptr;
for (size_t i = 0; i < size; i++) {
if (a[i] < b[i]) {
return -1;
} else if (b[i] < a[i]) {
return 1;
}
}
return 0;
}

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libc/string/memcpy.c Normal file
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#include <string.h>
void* memcpy(void* restrict dstptr, const void* restrict srcptr, size_t size) {
unsigned char* dst = (unsigned char*) dstptr;
const unsigned char* src = (const unsigned char*) srcptr;
for (size_t i = 0; i < size; i++) {
dst[i] = src[i];
}
return dstptr;
}

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libc/string/memmove.c Normal file
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#include <string.h>
void* memmove (void* dstptr, const void* srcptr, size_t size) {
unsigned char* dst = (unsigned char*) dstptr;
const unsigned char* src = (const unsigned char*) srcptr;
if (dst < src) {
for (size_t i = 0; i < size; i++) {
dst[i] = src[i];
}
} else {
for (size_t i = size; i != 0; i--) {
dst[i-1] = src[i-1];
}
}
return dstptr;
}

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libc/string/memset.c Normal file
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#include <string.h>
void* memset(void* bufptr, int value, size_t size) {
unsigned char* buf = (unsigned char*) bufptr;
for (size_t i = 0; i < size; i++) {
buf[i] = (unsigned char) value;
}
return bufptr;
}

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libc/string/strlen.c Normal file
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#include <string.h>
size_t strlen(const char* str) {
size_t len = 0;
while (str[len]) {
len++;
}
return len;
}

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qemu.sh Executable file
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#!/bin/sh
set -e
. ./iso.sh
qemu-system-$(./target-triplet-to-arch.sh $HOST) -cdrom rockos.iso

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target-triplet-to-arch.sh Executable file
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#!/bin/sh
if echo "$1" | grep -Eq 'i[[:digit:]]86-'; then
echo i386
else
echo "$1" | grep -Eo '^[[:alnum:]_]*'
fi