con_drv.s

别人的根据linux0.11改的一个小的操作系统

	.file	"con_drv.c"
	.section .text
.globl _put_queue
_put_queue:
	pushl	%ebp
	movl	%esp, %ebp
	pushl	%ebx
	subl	$4, %esp
	movl	12(%ebp), %eax
	movb	%al, -8(%ebp)
	movl	8(%ebp), %eax
	movb	65(%eax), %dl
	movb	%dl, %al
	sarb	$7, %al
	movb	%al, %cl
	shrb	$2, %cl
	leal	(%edx,%ecx), %eax
	andl	$63, %eax
	subb	%cl, %al
	movsbl	%al,%ebx
	movl	8(%ebp), %eax
	movb	64(%eax), %dl
	movb	%dl, %al
	sarb	$7, %al
	movb	%al, %cl
	shrb	$2, %cl
	leal	(%edx,%ecx), %eax
	andl	$63, %eax
	subb	%cl, %al
	movsbl	%al,%eax
	movl	%ebx, %edx
	subl	%eax, %edx
	movl	%edx, %eax
	cmpl	$64, %eax
	je	L4
	movl	8(%ebp), %eax
	movb	65(%eax), %cl
	movb	%cl, %al
	sarb	$7, %al
	movb	%al, %dl
	shrb	$2, %dl
	leal	(%ecx,%edx), %eax
	andl	$63, %eax
	subb	%dl, %al
	movsbl	%al,%ebx
	movl	8(%ebp), %edx
	movb	-8(%ebp), %al
	movb	%al, (%edx,%ebx)
	leal	1(%ecx), %edx
	movl	8(%ebp), %eax
	movb	%dl, 65(%eax)
L4:
	addl	$4, %esp
	popl	%ebx
	popl	%ebp
	ret
.globl _get_queue
_get_queue:
	pushl	%ebp
	movl	%esp, %ebp
	pushl	%ebx
	subl	$4, %esp
	movl	8(%ebp), %eax
	movb	64(%eax), %dl
	movb	%dl, %al
	sarb	$7, %al
	movb	%al, %cl
	shrb	$2, %cl
	leal	(%edx,%ecx), %eax
	andl	$63, %eax
	subb	%cl, %al
	movb	%al, %bl
	movl	8(%ebp), %eax
	movb	65(%eax), %dl
	movb	%dl, %al
	sarb	$7, %al
	movb	%al, %cl
	shrb	$2, %cl
	leal	(%edx,%ecx), %eax
	andl	$63, %eax
	subb	%cl, %al
	cmpb	%al, %bl
	jne	L6
	movl	8(%ebp), %eax
	movb	$0, 64(%eax)
	movl	8(%ebp), %eax
	movb	$0, 65(%eax)
	jmp	L5
L6:
	movl	8(%ebp), %eax
	movb	64(%eax), %cl
	movb	%cl, %al
	sarb	$7, %al
	movb	%al, %dl
	shrb	$2, %dl
	leal	(%ecx,%edx), %eax
	andl	$63, %eax
	subb	%dl, %al
	movsbl	%al,%edx
	movl	8(%ebp), %eax
	movb	(%eax,%edx), %al
	movsbl	%al,%ebx
	leal	1(%ecx), %edx
	movl	8(%ebp), %eax
	movb	%dl, 64(%eax)
	movl	%ebx, -8(%ebp)
L5:
	movl	-8(%ebp), %eax
	addl	$4, %esp
	popl	%ebx
	popl	%ebp
	ret
.globl _tty_init
_tty_init:
	pushl	%ebp
	movl	%esp, %ebp
	movb	$1, _tty
	movb	$0, _tty+65
	movb	$0, _tty+66
	movb	$0, _tty+131
	movb	$0, _tty+132
	movl	$_con_write, _tty+136
	popl	%ebp
	ret
.globl _char_drv_init
_char_drv_init:
	pushl	%ebp
	movl	%esp, %ebp
	subl	$8, %esp
	call	_con_init
	call	_tty_init
	subl	$8, %esp
	pushl	$_kb_interrupt
	pushl	$33
	call	_set_trap
	addl	$16, %esp
	subl	$12, %esp
	pushl	$33
	call	_inportb
	addl	$16, %esp
	movl	$0, %edx
	movb	%al, %dl
	movl	$253, %eax
	andl	%edx, %eax
	subl	$8, %esp
	pushl	%eax
	pushl	$33
	call	_outportb
	addl	$16, %esp
	leave
	ret
	.section .data
	.p2align 4
_key_map:
	.byte	0
	.byte	27
	.byte	96
	.byte	33
	.byte	64
	.byte	35
	.byte	36
	.byte	37
	.byte	38
	.byte	47
	.byte	40
	.byte	41
	.byte	61
	.byte	63
	.byte	127
	.byte	9
	.byte	81
	.byte	87
	.byte	69
	.byte	82
	.byte	84
	.byte	89
	.byte	85
	.byte	73
	.byte	79
	.byte	80
	.byte	93
	.byte	94
	.byte	10
	.byte	0
	.byte	65
	.byte	83
	.byte	68
	.byte	70
	.byte	71
	.byte	72
	.byte	74
	.byte	75
	.byte	76
	.byte	92
	.byte	91
	.byte	0
	.byte	0
	.byte	42
	.byte	90
	.byte	88
	.byte	67
	.byte	86
	.byte	66
	.byte	78
	.byte	77
	.byte	59
	.byte	58
	.byte	95
	.byte	0
	.byte	42
	.byte	0
	.byte	32
	.byte	0
	.byte	0
	.byte	0
	.byte	0
	.byte	0
	.byte	0
	.byte	0
	.byte	0
	.byte	0
	.byte	0
	.byte	0
	.byte	0
	.byte	0
	.byte	0
	.byte	0
	.byte	0
	.byte	45
	.byte	0
	.byte	0
	.byte	0
	.byte	43
	.byte	0
	.byte	0
	.byte	0
	.byte	0
	.byte	0
	.byte	0
	.byte	0
	.byte	62
	.byte	0
	.byte	0
	.byte	0
	.byte	0
	.byte	0
	.byte	0
	.byte	0
	.byte	0
	.byte	0
	.byte	0
	.space 30
	.section .text
.globl _do_kb_interrupt
_do_kb_interrupt:
	pushl	%ebp
	movl	%esp, %ebp
	subl	$24, %esp
	movl	8(%ebp), %eax
	movb	%al, -20(%ebp)
	cmpb	$0, -20(%ebp)
	js	L16
	movsbl	-20(%ebp),%eax
	movb	_key_map(%eax), %al
	movb	%al, -1(%ebp)
	movsbl	-1(%ebp),%eax
	pushl	%eax
	pushl	$_tty+1
	call	_put_queue
	addl	$8, %esp
	pushl	$_tty+1
	call	_get_queue
	addl	$4, %esp
	movsbl	%al,%eax
	pushl	%eax
	pushl	$_tty+67
	call	_put_queue
	addl	$8, %esp
	movsbl	-1(%ebp),%eax
	subl	$12, %esp
	pushl	%eax
	call	_putchark
	addl	$16, %esp
L16:
	leave
	ret
.comm _tty,432
	.ident	"GCC: (GNU) 4.2.1"