From f394eb42b4de6cc47dafc1140d62a7be9522ea86 Mon Sep 17 00:00:00 2001 From: VinceAle7082 Date: Tue, 23 Jul 2024 21:13:15 +0200 Subject: [PATCH] Many things Renamed main.asm in boot.asm and moved it into the bootloader directory, created an empty kernel.asm file, edited Makefile and edited the bootloader (boot.asm). --- Makefile | 44 ++++++++-- build/main.bin | Bin 512 -> 0 bytes build/main_floppy.img | Bin 1474560 -> 0 bytes src/bootloader/boot.asm | 182 ++++++++++++++++++++++++++++++++++++++++ src/kernel/kernel.asm | 0 src/main.asm | 51 ----------- 6 files changed, 221 insertions(+), 56 deletions(-) delete mode 100644 build/main.bin delete mode 100644 build/main_floppy.img create mode 100644 src/bootloader/boot.asm create mode 100644 src/kernel/kernel.asm delete mode 100644 src/main.asm diff --git a/Makefile b/Makefile index 3d6e6d5..49d75cd 100644 --- a/Makefile +++ b/Makefile @@ -3,9 +3,43 @@ ASM=nasm SRC_DIR=src BUILD_DIR=build -$(BUILD_DIR)/main_floppy.img: $(BUILD_DIR)/main.bin - cp $(BUILD_DIR)/main.bin $(BUILD_DIR)/main_floppy.img - truncate -s 1440k $(BUILD_DIR)/main_floppy.img +.PHONY: all floppy_image kernel bootloader clean always -$(BUILD_DIR)/main.bin: $(SRC_DIR)/main.asm - $(ASM) $(SRC_DIR)/main.asm -f bin -o $(BUILD_DIR)/main.bin + +#Immagine floppy + +immagine_floppy: $(BUILD_DIR)/main_floppy.img + +$(BUILD_DIR)/main_floppy.img: bootloader kernel + dd if=/dev/zero of=$(BUILD_DIR)/main_floppy.img bs=512 count=2880 + mkfs.fat -F 12 -n "XanvOS" $(BUILD_DIR)/main_floppy.img + dd if=$(BUILD_DIR)/bootloader.bin of=$(BUILD_DIR)/main_floppy.img conv=notrunc + mcopy -i $(BUILD_DIR)/main_floppy.img $(BUILD_DIR)/kernel.bin "::kernel.bin" + + +#Kernel + +kernel: $(BUILD_DIR)/kernel.bin + +$(BUILD_DIR)/kernel.bin: always + $(ASM) $(SRC_DIR)/kernel/kernel.asm -f bin -o $(BUILD_DIR)/kernel.bin + + +#Bootloader + +bootloader: $(BUILD_DIR)/bootloader.bin + +$(BUILD_DIR)/bootloader.bin: always + $(ASM) $(SRC_DIR)/bootloader/boot.asm -f bin -o $(BUILD_DIR)/bootloader.bin + + +#Always + +always: + mkdir -p $(BUILD_DIR) + + +#Clean + +clean: + rm -rf $(BUILD_DIR)/* \ No newline at end of file diff --git a/build/main.bin b/build/main.bin deleted file mode 100644 index 85ce440610a4ac7a5e4fa5e174c5416da799cdab..0000000000000000000000000000000000000000 GIT binary patch literal 0 HcmV?d00001 literal 512 zcmaDY5*84=hT}j9#}>Zr3}*#ie~ylbJG_H|q3=fDfxZiS7;5%u*Sxs(|I6!t9;rDw W`3m9rML8*oyj%>UVCaWH=qdoA%^XPp diff --git a/build/main_floppy.img b/build/main_floppy.img deleted file mode 100644 index 51012aeb259ba42dbfeb2d7b8af53df9f3b40f7f..0000000000000000000000000000000000000000 GIT binary patch literal 0 HcmV?d00001 literal 1474560 zcmeIuO$q^F0D$3dIVrMm0M;&IspO}W6}zvdWI1P;gUC{`kfyAarJO*0OV+rCspq}H z`=rifIND{^Cfm0T;o45G`D}4HhEU$is=S>-aqbt-$M>B+gH?=qcbc!`ve#?`)n8z| zt^b1q0t5&UAV7cs0RjXF5FkK+009C72oNAZfB*pk1PBlyK!5-N0t5&UAV7cs0RjXF z5FkK+009C72oNAZfB*pk1PBlyK!5-N0t5&UAV7cs0RjXF5FkK+009C72oNAZfB*pk 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+bdb_oem: db 'MSWIN4.1' +bdb_bytes_per_sector: dw 512 +bdb_sectors_per_cluster: db 1 +bdb_reserved_sectors: dw 1 +bdb_fat_count: db 2 +bdb_dir_entries_count: dw 0E0h +bdb_total_sectors: dw 2880 +bdb_media_descriptor_type: db 0F0h +bdb_sectors_per_fat: dw 9 +bdb_sectors_per_track: dw 18 +bdb_heads: dw 2 +bdb_hidden_sectors: dd 0 +bdb_large_sector_count: dd 0 + +ebr_drive_number: db 0 + db 0 +ebr_signature: db 29h +ebr_volume_id: db 12h, 34h, 56h, 78h +ebr_volume_label: db 'XanvicOS ' +ebr_system_id: db 'FAT12 ' + +;Codice + +start: + jmp main + +puts: + push si + push ax + push bx + +.loop: + lodsb + or al, al + jz .fine + + mov ah, 0x0E + mov bh, 0 + int 0x10 + + jmp .loop + +.fine: + pop bx + pop ax + pop si + ret + +main: + mov ax, 0 + mov ds, ax + mov es, ax + + mov ss, ax + mov sp, 0x7C00 + + mov si, msg_helloworld + call puts + + ;Legge cose dal floppy + mov [ebr_drive_number], dl + + mov ax, 1 + mov cl, 1 + mov bx, 0x7E00 + call lettura_disco + + cli + hlt + +;Errori + +errore_floppy: + mov si, msg_errore_lettura + call puts + jmp premi_per_riavviare + +premi_per_riavviare: + mov ah, 0 + int 16h + jmp 0FFFFh:0 + +.halt: + cli + hlt + +;Trasforma/Converte un indirizzo LBA in uno CHS + +lba_to_chs: + push ax + push dx + + xor dx, dx + div word [bdb_sectors_per_track] + + inc dx + mov cx, dx + + xor dx, dx + div word [bdb_heads] + + mov dh, dl + mov ch, al + shl ah, 6 + or cl, ah + + pop ax + mov dl, al + pop ax + + ret + +;Legge i settori da un disco + +lettura_disco: +; push ax +; push bx + push cx +; push dx +; push di + + call lba_to_chs + pop ax + + mov ah, 02h + mov di, 3 + +.riprova: + pusha + stc + int 13h + jnc .fine + + ;Errore nella lettura del disco + popa + call disk_reset + + dec di + test di, di + jnz .riprova + +.errore: + jmp errore_floppy + +.fine: + popa + +; pop di +; pop dx +; pop cx +; pop bx +; pop ax + ret + +disk_reset: + pusha + mov ah, 0 + stc + int 13h + jc errore_floppy + popa + ret + +;Mostra una stringa sullo schermo + +msg_helloworld: + db 'Hello World!', ENDL, 0 +msg_errore_lettura: + db 'Errore nella lettura del disco!' + +times 510-($-$$) db 0 +dw 0AA55h diff --git a/src/kernel/kernel.asm b/src/kernel/kernel.asm new file mode 100644 index 0000000..e69de29 diff --git a/src/main.asm b/src/main.asm deleted file mode 100644 index 0d07405..0000000 --- a/src/main.asm +++ /dev/null @@ -1,51 +0,0 @@ -org 0x7C00 -bits 16 - -%define ENDL 0x0D, 0x0A - -start: - jmp main - -puts: - push si - push ax - push bx - -.loop: - lodsb - or al, al - jz .done - - mov ah, 0x0E - mov bh, 0 - int 0x10 - - jmp .loop - -.done: - pop bx - pop ax - pop si - ret - -main: - - mov ax, 0 - mov ds, ax - mov es, ax - - mov ss, ax - mov sp, 0x7C00 - - mov si, msg_hello - call puts - - hlt - -.halt: - jmp .halt - -msg_hello: db 'Hello World!', ENDL, 0 - -times 510-($-$$) db 0 -dw 0AA55h