📄 startmenu.s

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BIOS call "INT 10H Function 03h" to get cursor position	Call with	%ah = 0x03			%bh = page        Returns         %ch = starting scan line                        %cl = ending scan line                        %dh = row (0 is top)                        %dl = column (0 is left)**************************************************************************/	.globl	console_getxyconsole_getxy:	pushl	%ebx	pushl	%esi	pushl	%edi	DO_REAL_CALL        xorb	%bh, %bh                /* set page to 0 */	movb	$0x3, %ah	int	$0x10			/* get cursor position */	DO_REAL_RETURN	xor	%eax, %eax	movb	%dl, %ah	movb	%dh, %al	popl	%edi	popl	%esi	popl	%ebx	ret/**************************************************************************console_gotoxy(x,y)BIOS call "INT 10H Function 02h" to set cursor position	Call with	%ah = 0x02			%bh = page                        %dh = row (0 is top)                        %dl = column (0 is left)**************************************************************************/	.globl	console_gotoxyconsole_gotoxy:	pushl	%ebp	movl	%esp,%ebp	pushl	%ebx	pushl	%esi	pushl	%edi	movb	0x8(%ebp), %dl           /* %dl = x */	movb	0xC(%ebp), %dh           /* %dh = y */	DO_REAL_CALL        xorb	%bh, %bh                /* set page to 0 */	movb	$0x2, %ah	int	$0x10			/* set cursor position */	DO_REAL_RETURN	popl	%edi	popl	%esi	popl	%ebx	popl	%ebp	ret/************************************************************************** * console_setattrib(attr) :  Sets the character attributes for character at *		current cursor position. * *  Bitfields for character's display attribute: *  Bit(s)	Description *   7		foreground blink *   6-4	background color *   3		foreground bright *   2-0	foreground color * *  Values for character color: *		Normal		Bright *   000b	black		dark gray *   001b	blue		light blue *   010b	green		light green *   011b	cyan		light cyan *   100b	red		light red *   101b	magenta		light magenta *   110b	brown		yellow *   111b	light gray	white * * BIOS call "INT 10H Function 08h" to read character and attribute data *	Call with	%ah = 0x08 *			%bh = page *	Returns		%ah = character attribute *			%al = character value * BIOS call "INT 10H Function 09h" to write character and attribute data *	Call with	%ah = 0x09 *			%al = character value *			%bh = page *			%bl = character attribute *			%cx = count to display (???, possible side-effects!!)**************************************************************************/	.globl	console_setattribconsole_setattrib:	pushl	%ebp	movl	%esp,%ebp	pushl	%ebx	pushl	%esi	pushl	%edi	movl	0x8(%ebp), %ecx	xorl	%ebx, %ebx	DO_REAL_CALL	movb	$0x8, %ah	int	$0x10	movb	$0x9, %ah	movb	%cl, %bl	movw	$1, %cx	int	$0x10	DO_REAL_RETURN	popl	%edi	popl	%esi	popl	%ebx	popl	%ebp	ret/**************************************************************************CONSOLE_PUTC - Print a character on console**************************************************************************/	.globl	console_putcconsole_putc:	pushl	%ebp	movl	%esp,%ebp	pushl	%ebx	pushl	%esi	pushl	%edi	movb	8(%ebp),%cl	DO_REAL_CALL	movl	$1,%ebx	movb	$0x0e,%ah	movb	%cl,%al	int	$0x10	DO_REAL_RETURN	popl	%edi	popl	%esi	popl	%ebx	popl	%ebp	ret/**************************************************************************CONSOLE_GETC - Get a character from console **************************************************************************/	.globl	console_getcconsole_getc:	pushl	%ebx	pushl	%esi	pushl	%edi	DO_REAL_CALL	movb	$0x0,%ah	int	$0x16	movb	%al,%bl	DO_REAL_RETURN	xor	%eax,%eax	movzbl	%bl,%eax	popl	%edi	popl	%esi	popl	%ebx	ret/**************************************************************************console_getkey()BIOS call "INT 16H Function 00H" to read character from keyboardCall with	%ah = 0x10Return:		%ah = keyboard scan code		%al = ASCII character **************************************************************************/	.globl	console_getkeyconsole_getkey:	pushl	%ebx	pushl	%esi	pushl	%edi	DO_REAL_CALL	movb	$0x0,%ah	int	$0x16	movw	%ax, %bx	DO_REAL_RETURN	movzwl	%bx, %eax	popl	%edi	popl	%esi	popl	%ebx	ret/**************************************************************************console_checkkey()if there is a character pending, return it; otherwise return -1BIOS call "INT 16H Function 01H" to check whether a character is pendingCall with	%ah = 0x1Return:		If key waiting to be input:		%ah = keyboard scan code		%al = ASCII character		Zero flag = clear	else		Zero flag = set **************************************************************************/	.globl	console_checkkeyconsole_checkkey:	pushl	%ebx	pushl	%esi	pushl	%edi	xorl	%ebx, %ebx	DO_REAL_CALL	movb	$0x1, %ah	int	$0x16	jz	1f	movw	%ax, %bx	jmp	2f1:	movl	$0xFFFFFFFF, %ebx2:	DO_REAL_RETURN	movzwl	%bx, %eax	popl	%edi	popl	%esi	popl	%ebx	ret/**************************************************************************ISCHAR - Check for keyboard interrupt**************************************************************************/	.globl	console_ischarconsole_ischar:	pushl	%ebx	pushl	%esi	pushl	%edi	DO_REAL_CALL	xorw	%bx,%bx	movb	$0x1,%ah	int	$0x16	jz	2f	movb	%al,%bl2:		DO_REAL_RETURN	movzbl	%bl,%eax	popl	%edi	popl	%esi	popl	%ebx	ret/**************************************************************************GETSHIFT - Get keyboard shift state**************************************************************************/	.globl	console_getshiftconsole_getshift:	pushl	%ebx	pushl	%esi	pushl	%edi	DO_REAL_CALL	movb	$2,%ah	int	$0x16	andb	$0xdf,%al	movw	%ax,%bx	DO_REAL_RETURN	movzbl	%bl,%eax	popl	%edi	popl	%esi	popl	%ebx	ret/**************************************************************************INT10 - Call Interrupt 0x10**************************************************************************/	.globl	_int10_int10:	push	%ebp	mov	%esp,%ebp	push	%ebx	push	%esi	push	%edi	movw	8(%ebp),%si	movw	10(%ebp),%bx	movw	12(%ebp),%cx	movw	14(%ebp),%dx	DO_REAL_CALL	movw	%si,%ax	int	$0x10	movw	%ax,%si	DO_REAL_RETURN	movl	%esi,%eax	andl	$0xFFFF,%eax	movw	%ax,int10ret	movw	%bx,int10ret+2	shl	$16,%ebx	orl	%ebx,%eax	movw	%cx,int10ret+4	movw	%dx,int10ret+6	pop	%edi	pop	%esi	pop	%ebx	pop	%ebp	ret	.globl	int10retint10ret:	.word	0,0,0,0/**************************************************************************CPU_NAP - Save power by halting the CPU until the next interrupt**************************************************************************/	.globl	cpu_napcpu_nap:	pushl	%ebx	pushl	%esi	pushl	%edi	DO_REAL_CALL	hlt	DO_REAL_RETURN	popl	%edi	popl	%esi	popl	%ebx	ret/**************************************************************************SETJMP - Save stack context for non-local goto**************************************************************************/	.globl	setjmpsetjmp:	movl	4(%esp),%ecx	movl	0(%esp),%edx	movl	%edx,0(%ecx)	movl	%ebx,4(%ecx)	movl	%esp,8(%ecx)	movl	%ebp,12(%ecx)	movl	%esi,16(%ecx)	movl	%edi,20(%ecx)	movl	%eax,24(%ecx)	movl	$0,%eax	ret/**************************************************************************LONGJMP - Non-local jump to a saved stack context**************************************************************************/	.globl	longjmplongjmp:	movl	4(%esp),%edx	movl	8(%esp),%eax	movl	0(%edx),%ecx	movl	4(%edx),%ebx	movl	8(%edx),%esp	movl	12(%edx),%ebp	movl	16(%edx),%esi	movl	20(%edx),%edi	cmpl	$0,%eax	jne	1f	movl	$1,%eax1:	movl	%ecx,0(%esp)	ret/**************************************************************************GLOBAL DESCRIPTOR TABLE**************************************************************************/	.align	4_gdt:gdtarg:	.word	0x27			/* limit */	.long	_gdt			/* addr */	.byte	0,0_pmcs:	/* 32 bit protected mode code segment */	.word	0xffff,0	.byte	0,0x9f,0xcf,0_pmds:	/* 32 bit protected mode data segment */	.word	0xffff,0	.byte	0,0x93,0xcf,0_rmcs:	/* 16 bit real mode code segment */	.word	0xffff,(0&0xffff)	.byte	(0>>16),0x9b,0x00,(0>>24)_rmds:	/* 16 bit real mode data segment */	.word	0xffff,(0&0xffff)	.byte	(0>>16),0x93,0x00,(0>>24)_gdt_end:gdtsave:	.long	0,0,0			/* previous GDT */virt_offset:	.long	0initsp:	.long	0days:	.long	0
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