mirror of
https://github.com/Tom-on64/kern.git
synced 2026-11-03 18:22:22 +00:00
Initial Commit
This commit is contained in:
@@ -0,0 +1,13 @@
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# Bootloader
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nasm -fbin src/boot.asm -o build/boot.bin
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nasm -fbin src/filetable.asm -o build/filetable.bin
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cat build/main.bin build/filetable.bin > build/bootloader.bin
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# Kernel
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nasm -fbin src/kernel.asm -o build/kernel.bin
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# Final binary
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cat build/bootloader.bin build/kernel.bin > build/os.bin
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# Run QEMU
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qemu-system-x86_64 -drive format=raw,file="./build/os.bin",index=0,media=disk -m 256M
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@@ -0,0 +1,60 @@
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[org 0x7c00]
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[bits 16]
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[global start]
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start:
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; Setup
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xor ax, ax
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mov es, ax
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mov ds, ax
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mov bp, 0x9000
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mov sp, bp
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; Read filetable from disk
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mov bx, FILETAB_LOC ; Filetable location in memory
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mov es, bx
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xor bx, bx
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mov ah, 2 ; Read from disk
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mov al, 1 ; Read 1 sector
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mov ch, 0 ; Cylinder
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mov dh, 0 ; Head
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mov cl, 2 ; Sector
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int 0x13 ; INT 0x13 - Disk operations
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jc readFail ; CF will be set if the read fails
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; Read filetable from disk
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mov bx, KERNEL_LOC ; Filetable location in memory
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mov es, bx
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xor bx, bx
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mov ah, 2 ; Read from disk
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mov al, 2 ; Read 2 sectors
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mov ch, 0 ; Cylinder
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mov dh, 0 ; Head
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mov cl, 3 ; Sector
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int 0x13 ; INT 0x13 - Disk operations
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jc readFail ; CF will be set if the read fails
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; Setup segmentation
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mov ax, KERNEL_LOC
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mov ds, ax
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mov es, ax
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mov fs, ax
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mov gs, ax
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mov ss, ax
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; Far jump to the kernel
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jmp KERNEL_LOC:0x0
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readFail:
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cli
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hlt
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FILETAB_LOC equ 0x1000
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KERNEL_LOC equ 0x2000
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times 510-($-$$) db 0
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dw 0xaa55
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@@ -0,0 +1,8 @@
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; Simple Filetable
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db "{" ; Start
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db "kernel.bin:03,"
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db "calc:05,"
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db "coolThing:07"
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db "}" ; End
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times 512-($-$$) db 0
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+185
@@ -0,0 +1,185 @@
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[bits 16]
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%define ENDL 0x0a, 0x0d
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start:
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call resetTextMode
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; Print start message
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mov si, startMsg
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call print
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; Runs prompt
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input:
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mov si, prompt
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call print
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mov di, userInput
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mov byte [inputLen], 0
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.loop:
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xor ax, ax ; Clear ax
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int 0x16 ; Get a character
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mov ah, 0x0e ; Echo back input
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mov bh, 0
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int 0x10
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cmp al, 0x0d ; Compare with CR
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je .enter
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mov [di], al ; Add the input to userInput
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inc di
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jmp .loop
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.enter:
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mov al, 0x0a ; Print LF
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int 0x10
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mov byte [di], 0; NULL terminate userInput (Replaces CR)
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mov al, [userInput]
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cmp al, 'H'
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je help
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cmp al, 'F'
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je fileBrowser
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cmp al, 'G'
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je graphicsTest
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cmp al, 'R'
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je reboot
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;
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; Load Program - Takes userInput and tries to run that file
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;
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loadProgram:
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mov ax, userInput
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; Get filetable into [es:di]
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mov bx, FILETAB_LOC
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mov es, bx
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xor bx, bx
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mov di, bx
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repne scasb ; Scan for string at ax, in string at di
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je .found
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mov si, notFoundMsg
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call print
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jmp input
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.found:
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jmp input
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;
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; Help - Prints the help message (helpMsg)
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;
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help:
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mov si, helpMsg
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call print
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jmp input
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;
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; File Browser
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;
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fileBrowser:
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mov si, browserMsg
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call print
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; Prints the filetable
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printFiletable:
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mov bx, FILETAB_LOC
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mov es, bx
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xor bx, bx
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xor cx, cx
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.filetableLoop:
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inc bx
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mov al, [es:bx] ; Get the filetable character
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cmp al, '}' ; Check for filetable end
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je .done
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cmp al, ':' ; Check for sector number
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je .sectorLoop
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cmp al, ',' ; Check for another entry
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je .entryLoop
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inc cx
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int 0x10
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jmp .filetableLoop
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.sectorLoop:
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cmp cx, 20
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je .filetableLoop
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mov al, ' '
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int 0x10
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inc cx
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jmp .sectorLoop
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.entryLoop:
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xor cx, cx
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mov si, newline
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call print
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jmp .filetableLoop
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.done:
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mov si, newline
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call print
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jmp input
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;
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; Graphics Mode Test
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;
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graphicsTest:
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call resetGraphicsMode
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; Test square
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mov ah, 0x0c ; Write gfx pixel
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mov al, 0x02 ; Green
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mov bh, 0 ; Page number
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mov cx, 100 ; Column number
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mov dx, 100 ; Row number
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int 0x10
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.colLoop:
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inc cx
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int 0x10
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cmp cx, 150
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jne .colLoop
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inc dx
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int 0x10
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mov cx, 99
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cmp dx, 150
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jne .colLoop
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.done:
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mov si, startMsg
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call print
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xor ax, ax
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int 0x16
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call resetTextMode
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jmp input
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;
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; Reboots the OS
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;
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reboot: jmp 0xffff:0x0000
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; ----------
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; Includes
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; ----------
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%include "./src/print.asm"
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%include "./src/screen.asm"
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; --------
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; Data
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; --------
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startMsg: db "kern.", ENDL, ENDL, 0 ; The bootup message
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prompt: db "> ", 0 ; Prompt for input
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newline: db ENDL, 0 ; CRLF
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notFoundMsg: db "File not found!", ENDL, 0
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browserMsg: db " Filename Sector ", ENDL, \
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"---------- --------", ENDL, 0
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helpMsg: db "Available Commands:", ENDL, \
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"F - List all files", ENDL, \
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"G - Graphics mode test", ENDL, \
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"H - Help", ENDL, \
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"R - Reboot", ENDL, 0
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userInput: db 0
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inputLen: db 0
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FILETAB_LOC equ 0x1000
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times 2*512-($-$$) db 0
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@@ -0,0 +1,49 @@
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;
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; Prints a string
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; si - Pointer to NULL terminated string
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;
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print:
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pusha
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mov ah, 0x0e
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mov bl, 0x0f
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mov bh, 0
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.loop:
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lodsb ; Load [si] into al; Increment si
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or al, al
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jz .done
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int 0x10
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jmp .loop
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.done:
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popa
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ret
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;
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; Prints a hex value
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; dx - Value to print in Hex
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;
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printHex:
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pusha
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xor cx, cx ; Init counter
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.loop:
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cmp cx, 4 ; Check for loop end
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je .done
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mov ax, dx ; Copy dx to ax
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and ax, 0x000f ; Get last nibble (4 bits) of ax
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add ax, '0' ; Convert number to an ASCII number (0-9)
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cmp ax, '9' ; Check if number was less than 9, meaning we can use it
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jle .addChar
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add ax, 0x07 ; Convert to letter (A-F)
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.addChar:
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mov bx, hexString + 5
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sub bx, cx ; Get position of current hex character
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mov [bx], al
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ror dx, 4 ; Rotate bits of dx (0x1a2b -> 0xb1a2)
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inc cx ; Increment the counter
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jmp .loop
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.done:
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mov si, hexString
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call print
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popa
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ret
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hexString: db "0x0000", 0
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@@ -0,0 +1,24 @@
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resetTextMode:
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pusha
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mov ah, 0 ; Set mode
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mov al, 0x03 ; 25x80, Text mode
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int 0x10
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mov ah, 0x0b ; Change color/palette
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mov bh, 0x00 ; Change BG color
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mov bl, 0x01 ; Blue BG
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int 0x10
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popa
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ret
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resetGraphicsMode:
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pusha
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mov ah, 0 ; Set mode
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mov al, 0x13 ; 320x200, 256 color graphics mode
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int 0x10
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popa
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ret
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