Subversion Repositories HelenOS

Rev

Rev 1078 | Rev 1096 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
308 jermar 1
#
319 jermar 2
# Copyright (C) 2003-2004 Jakub Jermar
1 jermar 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
 
306 palkovsky 29
#include <arch/asm/regname.h>
30
#include <arch/mm/page.h>
31
#include <arch/asm/boot.h>
317 palkovsky 32
#include <arch/context_offset.h>
306 palkovsky 33
 
1 jermar 34
.text
35
 
36
.set noat
37
.set noreorder
38
.set nomacro
39
 
40
.global kernel_image_start
41
.global tlb_refill_entry
42
.global cache_error_entry
43
.global exception_entry
313 palkovsky 44
.global userspace_asm
1 jermar 45
 
313 palkovsky 46
# Save registers to space defined by \r
47
# We will change $at on the way
306 palkovsky 48
.macro REGISTERS_STORE r
49
	sw $at,EOFFSET_AT(\r)
50
	sw $v0,EOFFSET_V0(\r)
51
	sw $v1,EOFFSET_V1(\r)
52
	sw $a0,EOFFSET_A0(\r)
53
	sw $a1,EOFFSET_A1(\r)
54
	sw $a2,EOFFSET_A2(\r)
55
	sw $a3,EOFFSET_A3(\r)
317 palkovsky 56
	sw $t0,EOFFSET_T0(\r)
306 palkovsky 57
	sw $t1,EOFFSET_T1(\r)
58
	sw $t2,EOFFSET_T2(\r)
59
	sw $t3,EOFFSET_T3(\r)
60
	sw $t4,EOFFSET_T4(\r)
61
	sw $t5,EOFFSET_T5(\r)
62
	sw $t6,EOFFSET_T6(\r)
63
	sw $t7,EOFFSET_T7(\r)
64
	sw $t8,EOFFSET_T8(\r)
65
	sw $t9,EOFFSET_T9(\r)
313 palkovsky 66
 
67
	mflo $at
68
	sw $at, EOFFSET_LO(\r)
69
	mfhi $at
70
	sw $at, EOFFSET_HI(\r)
71
 
1094 palkovsky 72
#ifdef CONFIG_DEBUG_ALLREGS	
306 palkovsky 73
	sw $s0,EOFFSET_S0(\r)
74
	sw $s1,EOFFSET_S1(\r)
75
	sw $s2,EOFFSET_S2(\r)
76
	sw $s3,EOFFSET_S3(\r)
77
	sw $s4,EOFFSET_S4(\r)
78
	sw $s5,EOFFSET_S5(\r)
79
	sw $s6,EOFFSET_S6(\r)
80
	sw $s7,EOFFSET_S7(\r)
1094 palkovsky 81
	sw $s8,EOFFSET_S8(\r)
82
#endif
83
 
306 palkovsky 84
	sw $gp,EOFFSET_GP(\r)
85
	sw $ra,EOFFSET_RA(\r)
313 palkovsky 86
	sw $sp,EOFFSET_SP(\r)
87
 
88
	mfc0 $at, $status
89
	sw $at,EOFFSET_STATUS(\r)
317 palkovsky 90
	mfc0 $at, $epc
91
	sw $at,EOFFSET_EPC(\r)
306 palkovsky 92
.endm
93
 
94
.macro REGISTERS_LOAD r
95
	lw $v0,EOFFSET_V0(\r)
96
	lw $v1,EOFFSET_V1(\r)
97
	lw $a0,EOFFSET_A0(\r)
98
	lw $a1,EOFFSET_A1(\r)
99
	lw $a2,EOFFSET_A2(\r)
100
	lw $a3,EOFFSET_A3(\r)
317 palkovsky 101
	lw $t0,EOFFSET_T0(\r)
306 palkovsky 102
	lw $t1,EOFFSET_T1(\r)
103
	lw $t2,EOFFSET_T2(\r)
104
	lw $t3,EOFFSET_T3(\r)
105
	lw $t4,EOFFSET_T4(\r)
106
	lw $t5,EOFFSET_T5(\r)
107
	lw $t6,EOFFSET_T6(\r)
108
	lw $t7,EOFFSET_T7(\r)
109
	lw $t8,EOFFSET_T8(\r)
110
	lw $t9,EOFFSET_T9(\r)
1094 palkovsky 111
 
112
#ifdef CONFIG_DEBUG_ALLREGS	
306 palkovsky 113
	lw $s0,EOFFSET_S0(\r)
114
	lw $s1,EOFFSET_S1(\r)
115
	lw $s2,EOFFSET_S2(\r)
116
	lw $s3,EOFFSET_S3(\r)
117
	lw $s4,EOFFSET_S4(\r)
118
	lw $s5,EOFFSET_S5(\r)
119
	lw $s6,EOFFSET_S6(\r)
120
	lw $s7,EOFFSET_S7(\r)
121
	lw $s8,EOFFSET_S8(\r)
1094 palkovsky 122
#endif
306 palkovsky 123
	lw $gp,EOFFSET_GP(\r)
124
	lw $ra,EOFFSET_RA(\r)
125
 
313 palkovsky 126
	lw $at,EOFFSET_LO(\r)
127
	mtlo $at
128
	lw $at,EOFFSET_HI(\r)
129
	mthi $at
130
 
131
	lw $at,EOFFSET_STATUS(\r)
132
	mtc0 $at, $status
317 palkovsky 133
	lw $at,EOFFSET_EPC(\r)
134
	mtc0 $at, $epc
313 palkovsky 135
 
136
	lw $at,EOFFSET_AT(\r)
137
	lw $sp,EOFFSET_SP(\r)
306 palkovsky 138
.endm
139
 
313 palkovsky 140
# Move kernel stack pointer address to register K0
141
# - if we are in user mode, load the appropriate stack
142
# address
143
.macro KERNEL_STACK_TO_K0
144
	# If we are in user mode
145
	mfc0 $k0, $status
146
	andi $k0, 0x10
306 palkovsky 147
 
313 palkovsky 148
	beq $k0, $0, 1f
149
	add $k0, $sp, 0
150
 
151
	# Move $k0 pointer to kernel stack
152
	lui $k0, %hi(supervisor_sp)
320 palkovsky 153
	ori $k0, $k0, %lo(supervisor_sp)
313 palkovsky 154
	# Move $k0 (superveisor_sp)
155
	lw $k0, 0($k0)
156
1:		
157
.endm
158
 
1 jermar 159
.org 0x0
306 palkovsky 160
kernel_image_start:
161
	/* Load temporary stack */
313 palkovsky 162
	lui $sp, %hi(end_stack)
320 palkovsky 163
	ori $sp, $sp, %lo(end_stack)
306 palkovsky 164
 
165
	/* Not sure about this, but might be needed for PIC code???? */
166
	lui $gp, 0x8000
167
 
168
	jal main_bsp
169
	nop
170
 
313 palkovsky 171
 
306 palkovsky 172
	.space TEMP_STACK_SIZE
326 palkovsky 173
end_stack:
174
 
175
tlb_refill_entry:
176
	j tlb_refill_handler
177
	nop
178
 
179
cache_error_entry:
180
	j cache_error_handler
181
	nop
182
 
183
exception_entry:
184
	j exception_handler
185
	nop	
186
 
306 palkovsky 187
 
326 palkovsky 188
 
313 palkovsky 189
exception_handler:
190
	KERNEL_STACK_TO_K0
191
	sub $k0, REGISTER_SPACE
192
	REGISTERS_STORE $k0
193
	add $sp, $k0, 0
194
 
317 palkovsky 195
	add $a0, $sp, 0 
196
	jal exception /* exception(register_space) */
313 palkovsky 197
	nop
198
 
199
	REGISTERS_LOAD $sp
200
	# The $sp is automatically restored to former value
201
	eret
202
	nop
203
 
1 jermar 204
tlb_refill_handler:
313 palkovsky 205
	KERNEL_STACK_TO_K0
206
	sub $k0, REGISTER_SPACE
207
	REGISTERS_STORE $k0
208
	add $sp, $k0, 0
125 jermar 209
 
317 palkovsky 210
	add $a0, $sp, 0 
211
	jal tlb_refill /* tlb_refill(register_space) */
50 jermar 212
	nop
125 jermar 213
 
306 palkovsky 214
	REGISTERS_LOAD $sp
125 jermar 215
 
50 jermar 216
	eret
306 palkovsky 217
	nop
1 jermar 218
 
219
cache_error_handler:
313 palkovsky 220
	KERNEL_STACK_TO_K0
306 palkovsky 221
	sub $sp, REGISTER_SPACE
222
	REGISTERS_STORE $sp
313 palkovsky 223
	add $sp, $k0, 0
1 jermar 224
 
50 jermar 225
	jal cache_error
226
	nop
125 jermar 227
 
306 palkovsky 228
	REGISTERS_LOAD $sp
1 jermar 229
 
50 jermar 230
	eret
308 jermar 231
	nop
313 palkovsky 232
 
233
userspace_asm:
234
	add $sp, $a0, 0
1078 jermar 235
	add $v0, $a1, 0
313 palkovsky 236
	eret
237
	nop
238