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112 lines
2.9 KiB
112 lines
2.9 KiB
void print(string);
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void* dump_ax_return(input);
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void print(string)
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char* string;
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{
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#asm
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push bp
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mov bp,sp
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mov si,4[bp]
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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new_print_print:
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; Prints string in si
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; IN si: zero terminated string to print
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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mov ah, #0xE ; Specify 'int 0x10' 'teletype output' function
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; [AL = Character, BH = Page Number, BL = Colour (in graphics mode)]
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.new_print_printchar:
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lodsb ; Load byte at address SI into AL, and increment SI
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test al, al
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jz .new_print_done ; If the character is zero (NUL), stop writing the string
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int #0x10 ; Otherwise, print the character via 'int 0x10'
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jmp .new_print_printchar ; Repeat for the next character
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.new_print_done:
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pop bp
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#endasm
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}
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void print_stack(argument)
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{
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#asm
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push bp
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mov bp,sp
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push ds
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push ax
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mov ax, ss
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mov ds, ax
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mov si,4[bp]
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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print_stack_print:
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; Prints string in si
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; IN si: zero terminated string to print
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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mov ah, #0xE ; Specify 'int 0x10' 'teletype output' function
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; [AL = Character, BH = Page Number, BL = Colour (in graphics mode)]
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.print_stack_printchar:
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lodsb ; Load byte at address SI into AL, and increment SI
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test al, al
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jz .print_stack_done ; If the character is zero (NUL), stop writing the string
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int #0x10 ; Otherwise, print the character via 'int 0x10'
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jmp .print_stack_printchar ; Repeat for the next character
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.print_stack_done:
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pop ax
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pop ds
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pop bp
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#endasm
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}
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void* dump_ax_return(input)
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void* input;
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{
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return input;
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}
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void dump_ax(input)
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void* input;
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{
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dump_ax_return(input)
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#asm
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push bp
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mov bp,sp
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pusha ; save registers
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mov bx, ax
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mov ah, #0xE ; Teletype output
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mov cx, #4 ; 4 nipples in a 16 bit word
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.dump_ax_loop:
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rol bx, #4 ; rotate to next nipple
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mov al, bl ; we copy to al because we need to mask only the low 4 bits
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and al, #%1111 ; Do the masking
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add al, #48 ; convert to ASCII
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cmp al, #57 ; If we are greater than 9 ascii, we add 7 to make digit 10 be represented as 'A'
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jbe .dump_ax_skip ; -|-
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add al, #7 ; -|-
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.dump_ax_skip: ; -|-
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int #0x10 ; BIOS call 'output'
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loop .dump_ax_loop
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popa ; restore registers
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pop bp
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#endasm
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}
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void print_newline()
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{
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#asm
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printCRLF:
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mov ah, #0xE
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mov al, #13
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int #0x10
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mov al, #10
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int #0x10
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ret
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#endasm
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}
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