diff options
| -rw-r--r-- | .gitignore | 7 | ||||
| -rw-r--r-- | Makefile | 37 | ||||
| -rw-r--r-- | build/.gitkeep | 0 | ||||
| -rw-r--r-- | linker.ld | 9 | ||||
| -rw-r--r-- | src/boot.asm | 31 | ||||
| -rw-r--r-- | src/kernel.c | 36 |
6 files changed, 120 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..44984ee --- /dev/null +++ b/.gitignore @@ -0,0 +1,7 @@ +/limine-binary +/limine-binary.tar.gz +/edk2-ovmf-bins +/edk2-ovmf-bins.tar.gz +/iso_root +*.iso +*.hdd diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..9779670 --- /dev/null +++ b/Makefile @@ -0,0 +1,37 @@ +.DEFAULT_GOAL := macaroni.iso + +LIMINE_SHARE = /opt/homebrew/share/limine/ + +BUILD_OUT = build +ASM = nasm +ASM_FLAGS = -felf32 +CFLAG = -std=c11 -ffreestanding -O0 -Wall -Wextra +CC = i686-elf-gcc +BINFLAG = -T linker.ld -ffreestanding -O0 -nostdlib -lgcc + +boot.o: src/boot.asm + ${ASM} ${ASM_FLAGS} src/boot.asm -o ${BUILD_OUT}/boot.o + +kernel.o: src/kernel.c + ${CC} -c src/kernel.c -o ${BUILD_OUT}/kernel.o ${CFLAG} + +macaroni.bin: boot.o kernel.o + ${CC} -o ${BUILD_OUT}/macaroni.bin ${BINFLAG} ${BUILD_OUT}/*.o + +macaroni.iso: macaroni.bin + mkdir -p ${BUILD_OUT}/iso + cp ${BUILD_OUT}/macaroni.bin ${BUILD_OUT}/iso/macaroni.bin + printf "timeout: 0\n/macaroni\n protocol: multiboot1\n kernel_path: boot():/macaroni.bin\n" > ${BUILD_OUT}/iso/limine.conf + cp ${LIMINE_SHARE}/limine-bios-cd.bin ${LIMINE_SHARE}/limine-bios.sys ${LIMINE_SHARE}/limine-uefi-cd.bin ${BUILD_OUT}/iso/ + xorriso -as mkisofs -R -r -J -b limine-bios-cd.bin -no-emul-boot -boot-load-size 4 -boot-info-table \ + --efi-boot limine-uefi-cd.bin -efi-boot-part --efi-boot-image --protective-msdos-label \ + ${BUILD_OUT}/iso -o ${BUILD_OUT}/macaroni.iso + limine bios-install ${BUILD_OUT}/macaroni.iso + +.PHONY: demo +demo: macaroni.iso + qemu-system-x86_64 -cdrom ${BUILD_OUT}/macaroni.iso + +.PHONY: clean +clean: + rm -rf ${BUILD_OUT}/** diff --git a/build/.gitkeep b/build/.gitkeep new file mode 100644 index 0000000..e69de29 --- /dev/null +++ b/build/.gitkeep diff --git a/linker.ld b/linker.ld new file mode 100644 index 0000000..29da3f9 --- /dev/null +++ b/linker.ld @@ -0,0 +1,9 @@ +ENTRY(_start) +SECTIONS +{ + . = 2M; + .text BLOCK(4K) : ALIGN(4K) { *(.multiboot_header) *(.text) } + .rodata BLOCK(4K) : ALIGN(4K) { *(.rodata) } + .data BLOCK(4K) : ALIGN(4K) { *(.data) } + .bss BLOCK(4K) : ALIGN(4K) { *(COMMON) *(.bss) } +} diff --git a/src/boot.asm b/src/boot.asm new file mode 100644 index 0000000..cbf57d6 --- /dev/null +++ b/src/boot.asm @@ -0,0 +1,31 @@ +;> The Multiboot header must be contained completely within the first 8192 bytes of the OS +;> image, and must be longword (32-bit) aligned. +MULTIBOOT_ALIGN_TO_PAGE: equ 1 << 0 +MULTIBOOT_MEMORY_DESCRIBE: equ 1 << 2 +MULTIBOOT_MAGIC: equ 0x1BADB002 +MULTIBOOT_FLAGS: equ (MULTIBOOT_ALIGN_TO_PAGE | MULTIBOOT_MEMORY_DESCRIBE) +MULTIBOOT_CHECKSUM: equ -(MULTIBOOT_MAGIC + MULTIBOOT_FLAGS) +section .multiboot_header +align 4 + dd MULTIBOOT_MAGIC + dd MULTIBOOT_FLAGS + dd MULTIBOOT_CHECKSUM + +STACK_SIZE: equ (1 << 14) +section .bss +align 16 +stack_bottom: + resb STACK_SIZE +stack_top: + +section .text +global _start:function (_start.end - _start) +_start: + mov esp, stack_top + extern cmain + call cmain + cli + +jmp $ + +.end: diff --git a/src/kernel.c b/src/kernel.c new file mode 100644 index 0000000..1459f73 --- /dev/null +++ b/src/kernel.c @@ -0,0 +1,36 @@ +#include <stddef.h> +#include <stdint.h> + +#define WIDTH 80 +#define HEIGHT 25 + +#define BLACK 0 +#define BLUE 1 +#define GREEN 2 +#define RED 4 +#define MAGENTA 13 +#define WHITE 15 + +int strlen(char* s) { + int n = 0; + char* s_ptr = s; + while (*(s_ptr++)) { + n++; + } + return n; +} + +void cmain(void) { + uint16_t* vgamem = (uint16_t*) 0xB8000; + uint16_t vgacolors[6] = {WHITE | RED << 4, WHITE | GREEN << 4, WHITE | BLUE << 4, BLACK | RED << 4, BLACK | GREEN << 4, BLACK | BLUE << 4}; + char* s = "Hello world!"; + int i,j,k; + for (k = 0; k >= 0; ++k) { + k = (k % 5); + j = 0; + while (j < 100000000) { j++; } // Since we don't have an interrupt descriptor table we can't use the PIC; this emulates "sleeping" + for (i = 0; i < WIDTH*HEIGHT; i++) { + vgamem[i] = s[i % strlen(s)] | vgacolors[(i+k) % 6] << 8; + } + } +}
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