iolib.s

别人的根据linux0.11改的一个小的操作系统

	.file	"iolib.c"
	.section .text
.globl _outportb
_outportb:
	pushl	%ebp
	movl	%esp, %ebp
	pushl	%ebx
	subl	$8, %esp
	movl	8(%ebp), %eax
	movl	12(%ebp), %edx
	movw	%ax, -8(%ebp)
	movb	%dl, -12(%ebp)
	movl	-8(%ebp), %ebx
	movb	-12(%ebp), %cl
/APP
	movw	%bx,%dx;movb	%cl,%al;outb	%al,%dx;
/NO_APP
	addl	$8, %esp
	popl	%ebx
	popl	%ebp
	ret
.globl _inportb
_inportb:
	pushl	%ebp
	movl	%esp, %ebp
	subl	$20, %esp
	movl	8(%ebp), %eax
	movw	%ax, -20(%ebp)
	movb	$0, -1(%ebp)
	movl	-20(%ebp), %ecx
/APP
	movw	%cx,%dx;inb	%dx,%al;movb	%al,%cl;
/NO_APP
	movb	%cl, -1(%ebp)
	movl	$0, %eax
	movb	-1(%ebp), %al
	leave
	ret
.globl _clrscr
_clrscr:
	pushl	%ebp
	movl	%esp, %ebp
/APP
	pushl	%eax;movl	$0x01,%eax;int	$0x80;popl	%eax;
/NO_APP
	popl	%ebp
	ret
.globl _scrup
_scrup:
	pushl	%ebp
	movl	%esp, %ebp
/APP
	pushl	%eax;movl	$0x03,%eax;int	$0x80;popl	%eax;
/NO_APP
	popl	%ebp
	ret
.globl _print
_print:
	pushl	%ebp
	movl	%esp, %ebp
	subl	$8, %esp
	jmp	L10
L11:
	movl	8(%ebp), %eax
	movb	(%eax), %al
	cmpb	$10, %al
	jne	L12
	movl	__scr_loc, %edx
	movl	$-858993459, -4(%ebp)
	movl	-4(%ebp), %eax
	mull	%edx
	movl	%edx, %eax
	shrl	$7, %eax
	leal	1(%eax), %edx
	movl	%edx, %eax
	sall	$2, %eax
	addl	%edx, %eax
	sall	$5, %eax
	movl	%eax, __scr_loc
	incl	8(%ebp)
	jmp	L10
L12:
	movl	8(%ebp), %eax
	movb	(%eax), %al
	movsbl	%al,%eax
	subl	$12, %esp
	pushl	%eax
	call	_putchar
	addl	$16, %esp
	incl	8(%ebp)
L10:
	movl	8(%ebp), %eax
	movb	(%eax), %al
	testb	%al, %al
	jne	L11
	leave
	ret
.globl _memcopy
_memcopy:
	pushl	%ebp
	movl	%esp, %ebp
	jmp	L17
L18:
	movl	12(%ebp), %eax
	movb	(%eax), %dl
	movl	8(%ebp), %eax
	movb	%dl, (%eax)
	incl	8(%ebp)
	incl	12(%ebp)
L17:
	decl	16(%ebp)
	cmpl	$-1, 16(%ebp)
	jne	L18
	popl	%ebp
	ret
.comm _desc,1008
.comm _task,1648
.comm _process_id,16
.comm _p_current,16
.comm _p_previous,16
.comm _p_ready,16
.comm _p_head,16
	.ident	"GCC: (GNU) 4.2.1"