Subversion Repositories HelenOS

Rev

Rev 3022 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
1018 decky 1
#
2071 jermar 2
# Copyright (c) 2006 Martin Decky
1018 decky 3
# All rights reserved.
4
#
5
# Redistribution and use in source and binary forms, with or without
6
# modification, are permitted provided that the following conditions
7
# are met:
8
#
9
# - Redistributions of source code must retain the above copyright
10
#   notice, this list of conditions and the following disclaimer.
11
# - Redistributions in binary form must reproduce the above copyright
12
#   notice, this list of conditions and the following disclaimer in the
13
#   documentation and/or other materials provided with the distribution.
14
# - The name of the author may not be used to endorse or promote products
15
#   derived from this software without specific prior written permission.
16
#
17
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
#
28
 
29
#include "regname.h"
30
 
31
.set noat
32
.set noreorder
33
.set nomacro
34
 
35
.text
36
 
37
.global halt
1685 decky 38
.global memcpy
1018 decky 39
.global jump_to_kernel
40
 
41
halt:
42
	b halt
43
	nop
1685 decky 44
 
45
memcpy:
46
	addiu	$v0,$a1,3
47
	li	$v1,-4			# 0xfffffffffffffffc
48
	and	$v0,$v0,$v1
49
	beq	$a1,$v0,3f
50
	move	$t0,$a0
4055 trochtova 51
	move	$t2,$a0			# save dst
1018 decky 52
 
1685 decky 53
0:
54
	beq	$a2,$zero,2f
55
	move	$a3,$zero
56
 
57
1:
58
	addu	$v0,$a1,$a3
59
	lbu	$a0,0($v0)
60
	addu	$v1,$t0,$a3
61
	addiu	$a3,$a3,1
62
	bne	$a3,$a2,1b
63
	sb	$a0,0($v1)
64
 
65
2:
66
	jr	$ra
4055 trochtova 67
	move	$v0,$t2
1685 decky 68
 
69
3:
70
	addiu	$v0,$a0,3
71
	and	$v0,$v0,$v1
72
	bne	$a0,$v0,0b
73
	srl	$t1,$a2,2
74
 
75
	beq	$t1,$zero,5f
76
	move	$a3,$zero
77
 
78
	move	$a3,$zero
79
	move	$a0,$zero
80
4:
81
	addu	$v0,$a1,$a0
82
	lw	$v1,0($v0)
83
	addiu	$a3,$a3,1
84
	addu	$v0,$t0,$a0
85
	sw	$v1,0($v0)
86
	bne	$a3,$t1,4b
87
	addiu	$a0,$a0,4
88
 
89
5:
90
	andi	$a2,$a2,0x3
91
	beq	$a2,$zero,2b
92
	nop
93
 
94
	sll	$v0,$a3,2
95
	addu	$t1,$v0,$t0
96
	move	$a3,$zero
97
	addu	$t0,$v0,$a1
98
6:
99
	addu	$v0,$t0,$a3
100
	lbu	$a0,0($v0)
101
	addu	$v1,$t1,$a3
102
	addiu	$a3,$a3,1
103
	bne	$a3,$a2,6b
104
	sb	$a0,0($v1)
105
 
106
	jr	$ra
4055 trochtova 107
	move	$v0,$t2
1685 decky 108
 
1018 decky 109
jump_to_kernel:
4055 trochtova 110
	#
111
	# TODO
112
	# Make sure that the I-cache, D-cache and memory are mutually coherent
113
	# before passing control to the copied code.
114
	#
1018 decky 115
	j $a0
116
	nop