]Hello guys, i have some problems with booting my os on my laptop.
I tried this basic tutorial to boot with grub: https://wiki.osdev.org/Bare_Bones#Booti ... ing_System
When I launched with qemu, all is good and no error appears but when I put my OS on a key and booting, it's perfectly starting GRUB
but when I'm selecting my OS it failed with error:
"error: no suitable video mode found"
So, if someone can help me with this I will be glad.
Here is all code that I used (code gave on the tutorial)
kernel.c
Code: Select all
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
/* Check if the compiler thinks you are targeting the wrong operating system. */
#if defined(__linux__)
#error "You are not using a cross-compiler, you will most certainly run into trouble"
#endif
/* This tutorial will only work for the 32-bit ix86 targets. */
#if !defined(__i386__)
#error "This tutorial needs to be compiled with a ix86-elf compiler"
#endif
/* Hardware text mode color constants. */
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;
}
size_t strlen(const char* str)
{
size_t len = 0;
while (str[len])
len++;
return len;
}
static const size_t VGA_WIDTH = 80;
static const size_t VGA_HEIGHT = 25;
size_t terminal_row;
size_t terminal_column;
uint8_t terminal_color;
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 = (uint16_t*) 0xB8000;
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(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)
{
terminal_putentryat(c, 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));
}
void kernel_main(void)
{
/* Initialize terminal interface */
terminal_initialize();
/* Newline support is left as an exercise. */
terminal_writestring("Hello, kernel World!");
}
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; constants for multiboot header
; See more tutorials for better comprehension
MALIGN equ 1<<0 ; Align all modules on page boudaries, (need) (more details) Also 1 << 0 == 1 (fucking tutorial)
MEMINFO equ 1<<1 ; provide memory map
FLAGS equ MALIGN | MEMINFO ; I think FLAGS = 11 ? It's multiboot flag field
MAGIC equ 0x1BADB002 ; magic number
CHECKSUM equ -(MAGIC + FLAGS) ; checksum of above, to prove we are multiboot
; set multiboot section
section .multiboot
align 4
dd MAGIC
dd FLAGS
dd CHECKSUM
section .data
align 4096
; initial stack
section .initial_stack, nobits
align 4
stack_bottom:
; 1 MB of uninitialized data for stack
resb 104856
stack_top:
; kernel entry, main text section
section .text
global _start
; define _start, aligned by linker.ld script
_start:
mov esp, stack_top
extern kernel_main
push ebx
call kernel_main
loop:
jmp loop
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ASM_SRC = boot.asm
NASM = nasm
ASM_FLAGS = -f elf32
CC = i386-elf-gcc
C_SRC = kernel.c
C_FLAGS = -W -std=gnu99 -ffreestanding -O2 -Wall -Wextra
OBJ = $(ASM_SRC:.asm=.o) $(C_SRC:.c=.o)
QEMU = qemu-system-i386
QEMU_FLAGS = -cdrom
LD = ld/linker.ld
GRUB = grub/grub.cfg
OS_NAME = myos
OS_BIN = $(OS_NAME).bin
OS_ISO = $(OS_NAME).iso
all: build
mkdir -p isodir/boot/grub
cp $(OS_BIN) isodir/boot/$(OS_BIN)
cp $(GRUB) isodir/boot/$(GRUB)
grub-mkrescue -o $(OS_ISO) isodir
build: $(OBJ)
$(CC) -T $(LD) -o $(OS_BIN) -ffreestanding -O2 -nostdlib $(OBJ) -lgcc
run:
$(QEMU) $(QEMU_FLAGS) $(OS_ISO)
clean:
$(RM) $(OBJ)
$(RM) *.bin
fclean: clean
$(RM) *.iso
re: fclean all
key:
sudo dd if=$(OS_ISO) of=/dev/sda && sync
%.o: %.c
$(CC) -c $(C_FLAGS) -o $@ $<
%.o: %.asm
$(NASM) $(ASM_FLAGS) -o $@ $<
