Starting point copied from guess-os
This commit is contained in:
commit
488b58b2d6
8 changed files with 419 additions and 0 deletions
0
README.md
Normal file
0
README.md
Normal file
57
input_util.asm
Normal file
57
input_util.asm
Normal file
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@ -0,0 +1,57 @@
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read_line:
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pusha
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mov bx, read_buffer
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.loop:
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mov ah, 0x00
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int 0x16 ; Read char
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cmp al, 0x0D ; Is enter?
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jne .enter_end
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jmp .end
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.enter_end:
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cmp al, 0x08 ; Is backspace?
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jne .backspace_end
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; Don't do anything if we're at col == 0
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cmp bx, read_buffer
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jle .backspace_end
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sub bx, 1
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mov ah, 0x0
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mov [bx], ah
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; Erase the character on screen
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mov ah, 0x0e
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mov al, 0x08 ; Back one
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int 0x10
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mov al, 0x20 ; Erase it
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int 0x10
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mov al, 0x08 ; Back one more
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int 0x10
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jmp .loop
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.backspace_end
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; Don't add any characters if over the limit
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cmp bx, read_buffer + 20
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jge .loop
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; Add char to bx and incr
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mov [bx], al
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add bx, 1
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; Display the character
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mov ah, 0x0e
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int 0x10
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jmp .loop
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.end:
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mov al, 0x0
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mov [bx], al ; Null terminater
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popa
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ret
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read_buffer: resb 20
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33
main.asm
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33
main.asm
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@ -0,0 +1,33 @@
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[org 0x7c00]
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main:
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; Video mode
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mov ax, 0x13
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int 0x10
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call mouse_initialize
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call mouse_enable
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lp:
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cli
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mov bx, [mouseX]
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call print_hex
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mov bx, [mouseY]
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sti
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jmp lp
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jmp $ ; Halt
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; Make sure includes are done last, otherwise the first include will become main
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%include "print_util.asm"
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;%include "input_util.asm"
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;%include "num_util.asm"
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%include "mouse_util.asm"
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; Make sure data is *inside* the boot sector, or it will not be copied to the right place
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; in memory.
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times 510-($-$$) db 0
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dw 0xaa55
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BIN
main.bin
Normal file
BIN
main.bin
Normal file
Binary file not shown.
163
mouse_util.asm
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163
mouse_util.asm
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@ -0,0 +1,163 @@
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; Adapted from https://stackoverflow.com/a/54367182
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HW_EQUIP_PS2 equ 4 ; PS2 mouse installed?
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MOUSE_PKT_BYTES equ 3 ; Number of bytes in mouse packet
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MOUSE_RESOLUTION equ 3 ; Mouse resolution 8 counts/mm
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VIDEO_MODE equ 0x13
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; Function: mouse_initialize
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; Initialize the mouse if present
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;
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; Inputs: None
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; Returns: CF = 1 if error, CF=0 success
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; Clobbers: AX
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mouse_initialize:
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push es
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push bx
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int 0x11 ; Get equipment list
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test ax, HW_EQUIP_PS2 ; Is a PS2 mouse installed?
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jz .no_mouse ; if not print error and end
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mov ax, 0xC205 ; Initialize mouse
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mov bh, MOUSE_PKT_BYTES ; 3 byte packets
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int 0x15 ; Call BIOS to initialize
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jc .no_mouse ; If not successful assume no mouse
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mov ax, 0xC203 ; Set resolution
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mov bh, MOUSE_RESOLUTION ; 8 counts / mm
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int 0x15 ; Call BIOS to set resolution
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jc .no_mouse ; If not successful assume no mouse
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push cs
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pop es ; ES = segment where code and mouse handler reside
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mov bx, mouse_callback_dummy
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mov ax, 0xC207 ; Install a default null handler (ES:BX)
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int 0x15 ; Call BIOS to set callback
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jc .no_mouse ; If not successful assume no mouse
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clc ; CF=0 is success
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jmp .finished
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.no_mouse:
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stc ; CF=1 is error
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.finished:
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pop bx
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pop es
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ret
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; Function: mouse_enable
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; Enable the mouse
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;
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; Inputs: None
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; Returns: None
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; Clobbers: AX
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mouse_enable:
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push es
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push bx
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call mouse_disable ; Disable mouse before enabling
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push cs
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pop es
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mov bx, mouse_callback
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mov ax, 0xC207 ; Set mouse callback function (ES:BX)
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int 0x15 ; Call BIOS to set callback
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mov ax, 0xC200 ; Enable/Disable mouse
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mov bh, 1 ; BH = Enable = 1
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int 0x15 ; Call BIOS to disable mouse
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pop bx
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pop es
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ret
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; Function: mouse_disable
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; Disable the mouse
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;
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; Inputs: None
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; Returns: None
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; Clobbers: AX
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mouse_disable:
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push es
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push bx
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mov ax, 0xC200 ; Enable/Disable mouse
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xor bx, bx ; BH = Disable = 0
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int 0x15 ; Call BIOS to disable mouse
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mov es, bx
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mov ax, 0xC207 ; Clear callback function (ES:BX=0:0)
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int 0x15 ; Call BIOS to set callback
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pop bx
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pop es
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ret
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; Function: mouse_callback (FAR)
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; called by the interrupt handler to process a mouse data packet
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; All registers that are modified must be saved and restored
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; Since we are polling manually this handler does nothing
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;
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; Inputs: SP+4 = Unused (0)
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; SP+6 = MovementY
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; SP+8 = MovementX
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; SP+10 = Mouse Status
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;
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; Returns: None
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; Clobbers: None
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ARG_OFFSETS equ 6 ; Offset of args from BP
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mouse_callback:
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push bp ; Function prologue
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mov bp, sp
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push ds ; Save registers we modify
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push ax
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push bx
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push cx
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push dx
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push cs
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pop ds ; DS = CS, CS = where our variables are stored
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mov al,[bp+ARG_OFFSETS+6]
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mov bl, al ; BX = copy of status byte
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mov cl, 3 ; Shift signY (bit 5) left 3 bits
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shl al, cl ; CF = signY
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; Sign bit of AL = SignX
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sbb dh, dh ; CH = SignY value set in all bits
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cbw ; AH = SignX value set in all bits
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mov dl, [bp+ARG_OFFSETS+2] ; CX = movementY
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mov al, [bp+ARG_OFFSETS+4] ; AX = movementX
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; new mouse X_coord = X_Coord + movementX
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; new mouse Y_coord = Y_Coord + (-movementY)
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neg dx
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mov cx, [mouseY]
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add dx, cx ; DX = new mouse Y_coord
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mov cx, [mouseX]
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add ax, cx ; AX = new mouse X_coord
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; Status
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mov [curStatus], bl ; Update the current status with the new bits
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mov [mouseX], ax ; Update current virtual mouseX coord
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mov [mouseY], dx ; Update current virtual mouseY coord
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pop dx ; Restore all modified registers
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pop cx
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pop bx
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pop ax
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pop ds
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pop bp ; Function epilogue
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mouse_callback_dummy:
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retf ; This routine was reached via FAR CALL. Need a FAR RET
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mouseX: dw 0 ; Current mouse X coordinate
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mouseY: dw 0 ; Current mouse Y coordinate
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curStatus: db 0 ; Current mouse status
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43
num_util.asm
Normal file
43
num_util.asm
Normal file
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@ -0,0 +1,43 @@
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; Loops over every character.
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; Multiplies current by 10
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; Adds [bx] - 0x30
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; add bx, 1
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parse_int:
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pusha
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; Contains the actual result
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mov ax, 0
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.loop:
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mov cl, [bx]
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cmp cl, 0x0 ; End on null
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je .end
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; If the character is invalid, stop here.
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cmp cl, 0x30
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jl .end
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cmp cl, 0x39
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jg .end
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; Multiply by 10
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mov cx, 10 ; NOT 0x10
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mul cx
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; Note: Has to be cx and not cl, otherwise it will be limited to 8-bits only
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mov cl, [bx]
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sub cl, 0x30
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mov ch, 0x0
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add ax, cx ; Use 16-bit addition
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add bx, 1 ; Next char
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jmp .loop
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.end:
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mov [result], ax
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popa
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ret
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result: dw 0
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121
print_util.asm
Normal file
121
print_util.asm
Normal file
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@ -0,0 +1,121 @@
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print:
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pusha
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.loop:
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mov al, [bx]
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cmp al, 0
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je .end ; go to end if char == 0
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mov ah, 0x0e
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int 0x10
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add bx, 1
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jmp .loop ; loop
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.end:
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popa
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ret
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print_nl:
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pusha
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mov ax, 0x0e0a
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int 0x10
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mov ax, 0x0e0d
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int 0x10
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popa
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ret
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println:
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pusha
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call print
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mov ax, 0x0e0a
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int 0x10
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mov ax, 0x0e0d
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int 0x10
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popa
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ret
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print_hex_digit:
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pusha
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mov al, bl
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mov bl, 0x0F
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and al, bl ; Get rid of all but the last nibble
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; If the value is >= 0xA, then we need to add to the alphabetical block of the ascii table
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cmp al, 0x0A
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jl .skip_alpha ; If the number is not at least 0xA, then skip this step
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add al, 0x07 ; 'A' == 0x41, '0' == 0x30, 0x41 - 0x30 == 0x11
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; Ignore ^^^^^^^ THIS ^^^^^^ actually.
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; It works and i've not got a clue why. Oh well. Such is life.
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.skip_alpha:
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add al, 0x30 ; Add ASCII '0'
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mov ah, 0x0e
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int 0x10
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popa
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ret
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print_hex:
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pusha
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mov ax, bx
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shr bx, 12
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call print_hex_digit
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mov bx, ax
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shr bx, 8
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call print_hex_digit
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mov bx, ax
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shr bx, 4
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call print_hex_digit
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mov bx, ax
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call print_hex_digit
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popa
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ret
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print_bin:
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pusha
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mov cx, 0
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.loop:
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cmp cx, 16
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je .end
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test bx, 0x8000
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jnz .one
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push bx
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mov bl, 0x02
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mov ah, 0x0e
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mov al, 0x30
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int 0x10
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pop bx
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jmp .continue
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.one:
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push bx
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mov bl, 0x03
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mov ah, 0x0e
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mov al, 0x31
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int 0x10
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pop bx
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.continue:
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shl bx, 1
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add cx, 1
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jmp .loop
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.end:
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popa
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ret
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2
run.sh
Executable file
2
run.sh
Executable file
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@ -0,0 +1,2 @@
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nasm -f bin main.asm -o main.bin
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qemu-system-x86_64 main.bin
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