klib.s

别人的根据linux0.11改的一个小的操作系统

	.file	"klib.c"
	.section .text
.globl _printk
_printk:
	pushl	%ebp
	movl	%esp, %ebp
	subl	$8, %esp
	jmp	L2
L3:
	movl	8(%ebp), %eax
	movb	(%eax), %al
	cmpb	$10, %al
	jne	L4
	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	L2
L4:
	movl	8(%ebp), %eax
	movb	(%eax), %al
	movsbl	%al,%eax
	subl	$12, %esp
	pushl	%eax
	call	_putchark
	addl	$16, %esp
	incl	8(%ebp)
L2:
	movl	8(%ebp), %eax
	movb	(%eax), %al
	testb	%al, %al
	jne	L3
	leave
	ret
.globl _getStartTime
_getStartTime:
	pushl	%ebp
	movl	%esp, %ebp
	movl	8(%ebp), %eax
	movl	20(%eax), %edx
	movl	%edx, %eax
	sall	$3, %eax
	addl	%edx, %eax
	sall	$3, %eax
	addl	%edx, %eax
	leal	0(,%eax,4), %edx
	leal	(%eax,%edx), %ecx
	movl	8(%ebp), %eax
	movl	16(%eax), %eax
	leal	(%eax,%eax), %edx
	movl	%edx, %eax
	sall	$4, %eax
	subl	%edx, %eax
	leal	(%ecx,%eax), %edx
	movl	8(%ebp), %eax
	movl	12(%eax), %eax
	addl	%eax, %edx
	movl	%edx, %eax
	addl	%eax, %eax
	addl	%edx, %eax
	sall	$3, %eax
	movl	%eax, %edx
	movl	8(%ebp), %eax
	movl	8(%eax), %eax
	leal	(%edx,%eax), %eax
	movl	%eax, %edx
	sall	$4, %edx
	movl	%edx, %eax
	sall	$4, %eax
	subl	%edx, %eax
	movl	%eax, %edx
	sall	$4, %edx
	movl	%edx, %ecx
	subl	%eax, %ecx
	movl	8(%ebp), %eax
	movl	4(%eax), %eax
	leal	0(,%eax,4), %edx
	movl	%edx, %eax
	sall	$4, %eax
	subl	%edx, %eax
	leal	(%ecx,%eax), %edx
	movl	8(%ebp), %eax
	movl	(%eax), %eax
	leal	(%edx,%eax), %eax
	popl	%ebp
	ret
.globl _set_tss_desc
_set_tss_desc:
	pushl	%ebp
	movl	%esp, %ebp
	subl	$16, %esp
	sall	8(%ebp)
	movl	12(%ebp), %eax
	movl	%eax, -4(%ebp)
	movl	8(%ebp), %ecx
	movl	__gdt, %eax
	leal	32(%eax), %edx
	movl	8(%ebp), %eax
	sall	$3, %eax
	leal	(%edx,%eax), %eax
	movl	%eax, _desc(,%ecx,4)
	movl	8(%ebp), %eax
	movl	_desc(,%eax,4), %eax
	movw	$103, (%eax)
	movl	8(%ebp), %eax
	movl	_desc(,%eax,4), %edx
	movl	-4(%ebp), %eax
	movw	%ax, 2(%edx)
	movl	8(%ebp), %eax
	movl	_desc(,%eax,4), %edx
	movl	-4(%ebp), %eax
	shrl	$16, %eax
	movb	%al, 4(%edx)
	movl	8(%ebp), %eax
	movl	_desc(,%eax,4), %eax
	movb	$-119, 5(%eax)
	movl	8(%ebp), %eax
	movl	_desc(,%eax,4), %eax
	movb	$0, 6(%eax)
	movl	8(%ebp), %eax
	movl	_desc(,%eax,4), %edx
	movl	-4(%ebp), %eax
	shrl	$24, %eax
	movb	%al, 7(%edx)
	leave
	ret
.globl _set_ldt_desc
_set_ldt_desc:
	pushl	%ebp
	movl	%esp, %ebp
	subl	$16, %esp
	sall	8(%ebp)
	incl	8(%ebp)
	movl	12(%ebp), %eax
	movl	%eax, -4(%ebp)
	movl	8(%ebp), %ecx
	movl	__gdt, %eax
	leal	32(%eax), %edx
	movl	8(%ebp), %eax
	sall	$3, %eax
	leal	(%edx,%eax), %eax
	movl	%eax, _desc(,%ecx,4)
	movl	8(%ebp), %eax
	movl	_desc(,%eax,4), %eax
	movw	$31, (%eax)
	movl	8(%ebp), %eax
	movl	_desc(,%eax,4), %edx
	movl	-4(%ebp), %eax
	movw	%ax, 2(%edx)
	movl	8(%ebp), %eax
	movl	_desc(,%eax,4), %edx
	movl	-4(%ebp), %eax
	shrl	$16, %eax
	movb	%al, 4(%edx)
	movl	8(%ebp), %eax
	movl	_desc(,%eax,4), %eax
	movb	$-126, 5(%eax)
	movl	8(%ebp), %eax
	movl	_desc(,%eax,4), %eax
	movb	$0, 6(%eax)
	movl	8(%ebp), %eax
	movl	_desc(,%eax,4), %edx
	movl	-4(%ebp), %eax
	shrl	$24, %eax
	movb	%al, 7(%edx)
	leave
	ret
.globl _set_ldt
_set_ldt:
	pushl	%ebp
	movl	%esp, %ebp
	subl	$16, %esp
	movl	8(%ebp), %eax
	movl	%eax, -8(%ebp)
	movl	16(%ebp), %eax
	movl	%eax, -4(%ebp)
	movl	-8(%ebp), %eax
	movw	$0, (%eax)
	movl	-8(%ebp), %eax
	movw	$0, 2(%eax)
	movl	-8(%ebp), %eax
	movb	$0, 4(%eax)
	movl	-8(%ebp), %eax
	movb	$0, 5(%eax)
	movl	-8(%ebp), %eax
	movb	$0, 6(%eax)
	movl	-8(%ebp), %eax
	movb	$0, 7(%eax)
	movl	-8(%ebp), %edx
	addl	$8, %edx
	movl	12(%ebp), %eax
	movw	%ax, (%edx)
	movl	-8(%ebp), %edx
	addl	$8, %edx
	movl	-4(%ebp), %eax
	movw	%ax, 2(%edx)
	movl	-8(%ebp), %edx
	addl	$8, %edx
	movl	-4(%ebp), %eax
	shrl	$16, %eax
	movb	%al, 4(%edx)
	movl	-8(%ebp), %eax
	addl	$8, %eax
	movb	$-6, 5(%eax)
	movl	-8(%ebp), %eax
	addl	$8, %eax
	movb	$-64, 6(%eax)
	movl	-8(%ebp), %edx
	addl	$8, %edx
	movl	-4(%ebp), %eax
	shrl	$24, %eax
	movb	%al, 7(%edx)
	movl	-8(%ebp), %edx
	addl	$16, %edx
	movl	12(%ebp), %eax
	movw	%ax, (%edx)
	movl	-8(%ebp), %edx
	addl	$16, %edx
	movl	-4(%ebp), %eax
	movw	%ax, 2(%edx)
	movl	-8(%ebp), %edx
	addl	$16, %edx
	movl	-4(%ebp), %eax
	shrl	$16, %eax
	movb	%al, 4(%edx)
	movl	-8(%ebp), %eax
	addl	$16, %eax
	movb	$-14, 5(%eax)
	movl	-8(%ebp), %eax
	addl	$16, %eax
	movb	$-64, 6(%eax)
	movl	-8(%ebp), %edx
	addl	$16, %edx
	movl	-4(%ebp), %eax
	shrl	$24, %eax
	movb	%al, 7(%edx)
	movl	-8(%ebp), %eax
	addl	$24, %eax
	movw	$0, (%eax)
	movl	-8(%ebp), %eax
	addl	$24, %eax
	movw	$0, 2(%eax)
	movl	-8(%ebp), %eax
	addl	$24, %eax
	movb	$0, 4(%eax)
	movl	-8(%ebp), %eax
	addl	$24, %eax
	movb	$0, 5(%eax)
	movl	-8(%ebp), %eax
	addl	$24, %eax
	movb	$0, 6(%eax)
	movl	-8(%ebp), %eax
	addl	$24, %eax
	movb	$0, 7(%eax)
	leave
	ret
.globl _set_trap
_set_trap:
	pushl	%ebp
	movl	%esp, %ebp
	subl	$16, %esp
	movl	12(%ebp), %eax
	movl	%eax, -4(%ebp)
	movl	__idt, %eax
	movl	%eax, -8(%ebp)
	movl	8(%ebp), %eax
	sall	$3, %eax
	addl	%eax, -8(%ebp)
	movl	-4(%ebp), %eax
	movl	%eax, %edx
	movl	-8(%ebp), %eax
	movw	%dx, (%eax)
	movl	-8(%ebp), %eax
	movw	$8, 2(%eax)
	movl	-8(%ebp), %eax
	movb	$0, 4(%eax)
	movl	-8(%ebp), %eax
	movb	$-114, 5(%eax)
	movl	-4(%ebp), %eax
	shrl	$16, %eax
	movl	%eax, %edx
	movl	-8(%ebp), %eax
	movw	%dx, 6(%eax)
	leave
	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"