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This commit is contained in:
Robbe Van Herck 2019-12-28 17:25:29 +01:00
parent b308617ac8
commit 984ef385f1
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GPG key ID: A66F76F7B81BD784
4 changed files with 23 additions and 13 deletions
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7
Makefile
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@ -2,13 +2,12 @@ run_kernel: compile_kernel
qemu-system-i386 -kernel target/kernel.bin
compile_kernel:
nasm -f bin kernel/boot.asm -o target/kernel_boot.o
nasm -felf32 kernel/boot.asm -o target/boot.o
i686-elf-gcc -c kernel/kernel.c -o target/kernel.o -std=gnu99 -ffreestanding -O2 -Wall -Wextra
i686-elf-gcc -T kernel/linker.ld -o target/kernel.bin -ffreestanding -O2 -nostdlib target/kernel_boot.o target/kernel.o -lgcc
i686-elf-gcc -T kernel/linker.ld -o target/kernel.bin -ffreestanding -O2 -nostdlib target/boot.o target/kernel.o -lgcc
compile_bootloader:
compile_bootloader: compile_kernel
rm -rf target/boot.bin
nasm -f bin bootloader/test_kernel.asm -o target/kernel.bin
nasm -f bin -o target/boot.bin bootloader/main.asm
run_bootloader: compile_bootloader

14
bootloader/main.asm
View file

@ -219,7 +219,19 @@ mov ss, ax
; set up stack
mov esp, 0x090000
jmp 0x08:0x8000
; load offset from ELF file
; mind the differing endian
mov edx, 0x8018
mov ah, [ds:edx+2]
mov al, [ds:edx+3]
shl eax, 16
mov ah, [ds:edx]
mov al, [ds:edx+1]
; add the beginning 0x8000
add eax, 0x8000
jmp eax
.end:
jmp .end

10
kernel/kernel.c
View file

@ -110,9 +110,9 @@ void kernel_main(void)
terminal_initialize();
/* Newline support is left as an exercise. */
terminal_writestring("Hello, ");
terminal_setcolor(vga_entry_color(VGA_COLOR_GREEN, VGA_COLOR_BLACK));
terminal_writestring("kernel");
terminal_setcolor(vga_entry_color(VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK));
terminal_writestring(" World!\n");
// terminal_writestring("Hello, ");
// terminal_setcolor(vga_entry_color(VGA_COLOR_GREEN, VGA_COLOR_BLACK));
// terminal_writestring("kernel");
// terminal_setcolor(vga_entry_color(VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK));
// terminal_writestring(" World!\n");
}

5
kernel/linker.ld
View file

@ -6,9 +6,8 @@ ENTRY(_start)
kernel image. */
SECTIONS
{
/* Begin putting sections at 1 MiB, a conventional place for kernels to be
loaded at by the bootloader. */
. = 1M;
/* Set this to 0, so the program entry is the relative position to the start of the kernel */
. = 0;
/* First put the multiboot header, as it is required to be put very early
early in the image or the bootloader won't recognize the file format.