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C_SOURCES = $(wildcard kernel/*.c drivers/*.c)
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HEADERS = $(wildcard kernel/*.h drivers/*.h)
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OBJ = ${C_SOURCES:.c=.o}
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# Change this if your cross-compiler is somewhere else
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CC = /usr/local/i386elfgcc/bin/i386-elf-gcc
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GDB = /usr/local/i386elfgcc/bin/i386-elf-gdb
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# -g: Use debugging symbols
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CFLAGS = -g
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# First rule is run by default
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os-image.bin: boot/bootsect.bin kernel.bin
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cat $^ > os-image.bin
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kernel.bin: kernel.elf
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i386-elf-ld -o $@ -Ttext 0x1000 $^ --oformat binary
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run: os-image.bin
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qemu-system-i386 -fda os-image.bin
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debug: os-image.bin kernel.elf
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qemu-system-i386 -s -fda os-image.bin &
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${GDB} -ex "target remote localhost:1234" -ex "symbol-file kernel.elf"
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# To build the kernel: make all objects first
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kernel.elf: boot/kernel_entry.o ${OBJ}
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i386-elf-ld -o $@ -Ttext 0x1000 $^
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# To make an object, always compile from its .c
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%.o: %.c ${HEADERS}
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${CC} ${CFLAGS} -ffreestanding -c $< -o $@
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# Object files from asm files
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%.o: %.asm
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nasm $< -f elf -o $@
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%.bin: %.asm
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nasm $< -f bin -o $@
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clean:
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rm -rf *.bin *.dis *.o os-image.bin *.elf
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rm -rf kernel/*.o boot/*.bin drivers/*.o
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../../08-32bit-print/32bit-print.asm
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; Identical to lesson 13's boot sector, but the %included files have new paths
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[org 0x7c00]
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KERNEL_OFFSET equ 0x1000 ; The same one we used when linking the kernel
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mov [BOOT_DRIVE], dl ; Remember that the BIOS sets us the boot drive in 'dl' on boot
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mov bp, 0x9000
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mov sp, bp
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mov bx, MSG_REAL_MODE
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call print
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call print_nl
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call load_kernel ; read the kernel from disk
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call switch_to_pm ; disable interrupts, load GDT, etc. Finally jumps to 'BEGIN_PM'
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jmp $ ; Never executed
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%include "boot/print.asm"
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%include "boot/print_hex.asm"
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%include "boot/disk.asm"
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%include "boot/gdt.asm"
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%include "boot/32bit_print.asm"
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%include "boot/switch_pm.asm"
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[bits 16]
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load_kernel:
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mov bx, MSG_LOAD_KERNEL
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call print
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call print_nl
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mov bx, KERNEL_OFFSET ; Read from disk and store in 0x1000
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mov dh, 2
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mov dl, [BOOT_DRIVE]
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call disk_load
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ret
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[bits 32]
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BEGIN_PM:
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mov ebx, MSG_PROT_MODE
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call print_string_pm
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call KERNEL_OFFSET ; Give control to the kernel
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jmp $ ; Stay here when the kernel returns control to us (if ever)
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BOOT_DRIVE db 0 ; It is a good idea to store it in memory because 'dl' may get overwritten
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MSG_REAL_MODE db "Started in 16-bit Real Mode", 0
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MSG_PROT_MODE db "Landed in 32-bit Protected Mode", 0
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MSG_LOAD_KERNEL db "Loading kernel into memory", 0
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; padding
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times 510 - ($-$$) db 0
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dw 0xaa55
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../../07-bootsector-disk/boot_sect_disk.asm
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../../09-32bit-gdt/32bit-gdt.asm
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../../13-kernel-barebones/kernel_entry.asm
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../../10-32bit-enter/32bit-switch.asm
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/* This will force us to create a kernel entry function instead of jumping to kernel.c:0x00 */
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void dummy_test_entrypoint() {
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}
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void main() {
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char* video_memory = (char*) 0xb8000;
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*video_memory = 'X';
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}
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