Subversion Repositories HelenOS

Rev

Rev 319 | Rev 326 | 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
#define __ASM__
30
 
31
#include <arch/asm/regname.h>
32
#include <arch/mm/page.h>
33
#include <arch/asm/boot.h>
317 palkovsky 34
#include <arch/context_offset.h>
306 palkovsky 35
 
1 jermar 36
.text
37
 
38
.set noat
39
.set noreorder
40
.set nomacro
41
 
42
.global kernel_image_start
43
.global tlb_refill_entry
44
.global cache_error_entry
45
.global exception_entry
313 palkovsky 46
.global userspace_asm
1 jermar 47
 
313 palkovsky 48
# Save registers to space defined by \r
49
# We will change $at on the way
306 palkovsky 50
.macro REGISTERS_STORE r
51
	sw $at,EOFFSET_AT(\r)
52
	sw $v0,EOFFSET_V0(\r)
53
	sw $v1,EOFFSET_V1(\r)
54
	sw $a0,EOFFSET_A0(\r)
55
	sw $a1,EOFFSET_A1(\r)
56
	sw $a2,EOFFSET_A2(\r)
57
	sw $a3,EOFFSET_A3(\r)
317 palkovsky 58
	sw $t0,EOFFSET_T0(\r)
306 palkovsky 59
	sw $t1,EOFFSET_T1(\r)
60
	sw $t2,EOFFSET_T2(\r)
61
	sw $t3,EOFFSET_T3(\r)
62
	sw $t4,EOFFSET_T4(\r)
63
	sw $t5,EOFFSET_T5(\r)
64
	sw $t6,EOFFSET_T6(\r)
65
	sw $t7,EOFFSET_T7(\r)
66
	sw $t8,EOFFSET_T8(\r)
67
	sw $t9,EOFFSET_T9(\r)
313 palkovsky 68
 
69
	mflo $at
70
	sw $at, EOFFSET_LO(\r)
71
	mfhi $at
72
	sw $at, EOFFSET_HI(\r)
73
 
306 palkovsky 74
	sw $s0,EOFFSET_S0(\r)
75
	sw $s1,EOFFSET_S1(\r)
76
	sw $s2,EOFFSET_S2(\r)
77
	sw $s3,EOFFSET_S3(\r)
78
	sw $s4,EOFFSET_S4(\r)
79
	sw $s5,EOFFSET_S5(\r)
80
	sw $s6,EOFFSET_S6(\r)
81
	sw $s7,EOFFSET_S7(\r)
82
	sw $s8,EOFFSET_S8(\r)	
83
	sw $gp,EOFFSET_GP(\r)
84
	sw $ra,EOFFSET_RA(\r)
313 palkovsky 85
	sw $sp,EOFFSET_SP(\r)
86
 
87
	mfc0 $at, $status
88
	sw $at,EOFFSET_STATUS(\r)
317 palkovsky 89
	mfc0 $at, $epc
90
	sw $at,EOFFSET_EPC(\r)
306 palkovsky 91
.endm
92
 
93
.macro REGISTERS_LOAD r
94
	lw $v0,EOFFSET_V0(\r)
95
	lw $v1,EOFFSET_V1(\r)
96
	lw $a0,EOFFSET_A0(\r)
97
	lw $a1,EOFFSET_A1(\r)
98
	lw $a2,EOFFSET_A2(\r)
99
	lw $a3,EOFFSET_A3(\r)
317 palkovsky 100
	lw $t0,EOFFSET_T0(\r)
306 palkovsky 101
	lw $t1,EOFFSET_T1(\r)
102
	lw $t2,EOFFSET_T2(\r)
103
	lw $t3,EOFFSET_T3(\r)
104
	lw $t4,EOFFSET_T4(\r)
105
	lw $t5,EOFFSET_T5(\r)
106
	lw $t6,EOFFSET_T6(\r)
107
	lw $t7,EOFFSET_T7(\r)
108
	lw $t8,EOFFSET_T8(\r)
109
	lw $t9,EOFFSET_T9(\r)
110
	lw $s0,EOFFSET_S0(\r)
111
	lw $s1,EOFFSET_S1(\r)
112
	lw $s2,EOFFSET_S2(\r)
113
	lw $s3,EOFFSET_S3(\r)
114
	lw $s4,EOFFSET_S4(\r)
115
	lw $s5,EOFFSET_S5(\r)
116
	lw $s6,EOFFSET_S6(\r)
117
	lw $s7,EOFFSET_S7(\r)
118
	lw $s8,EOFFSET_S8(\r)
119
	lw $gp,EOFFSET_GP(\r)
120
	lw $ra,EOFFSET_RA(\r)
121
 
313 palkovsky 122
	lw $at,EOFFSET_LO(\r)
123
	mtlo $at
124
	lw $at,EOFFSET_HI(\r)
125
	mthi $at
126
 
127
	lw $at,EOFFSET_STATUS(\r)
128
	mtc0 $at, $status
317 palkovsky 129
	lw $at,EOFFSET_EPC(\r)
130
	mtc0 $at, $epc
313 palkovsky 131
 
132
	lw $at,EOFFSET_AT(\r)
133
	lw $sp,EOFFSET_SP(\r)
306 palkovsky 134
.endm
135
 
313 palkovsky 136
# Move kernel stack pointer address to register K0
137
# - if we are in user mode, load the appropriate stack
138
# address
139
.macro KERNEL_STACK_TO_K0
140
	# If we are in user mode
141
	mfc0 $k0, $status
142
	andi $k0, 0x10
306 palkovsky 143
 
313 palkovsky 144
	beq $k0, $0, 1f
145
	add $k0, $sp, 0
146
 
147
	# Move $k0 pointer to kernel stack
148
	lui $k0, %hi(supervisor_sp)
320 palkovsky 149
	ori $k0, $k0, %lo(supervisor_sp)
313 palkovsky 150
	# Move $k0 (superveisor_sp)
151
	lw $k0, 0($k0)
152
1:		
153
.endm
154
 
1 jermar 155
.org 0x0
156
tlb_refill_entry:
50 jermar 157
	j tlb_refill_handler
158
	nop
1 jermar 159
 
160
.org 0x100
161
cache_error_entry:
50 jermar 162
	j cache_error_handler
163
	nop
125 jermar 164
 
1 jermar 165
.org 0x180
313 palkovsky 166
norm_exception:	
167
	j exception_handler
168
	nop	
125 jermar 169
 
313 palkovsky 170
.org 0x200
171
iv_exception:	
172
	j exception_handler
173
	nop	
125 jermar 174
 
313 palkovsky 175
.org KA2PA(KERNEL_STARTUP_ADDRESS)
306 palkovsky 176
kernel_image_start:
177
	/* Load temporary stack */
313 palkovsky 178
	lui $sp, %hi(end_stack)
320 palkovsky 179
	ori $sp, $sp, %lo(end_stack)
306 palkovsky 180
 
181
	/* Not sure about this, but might be needed for PIC code???? */
182
	lui $gp, 0x8000
183
 
184
	jal main_bsp
185
	nop
186
 
313 palkovsky 187
 
306 palkovsky 188
	.space TEMP_STACK_SIZE
313 palkovsky 189
end_stack:	
306 palkovsky 190
 
313 palkovsky 191
exception_handler:
192
exception_entry:
193
	KERNEL_STACK_TO_K0
194
	sub $k0, REGISTER_SPACE
195
	REGISTERS_STORE $k0
196
	add $sp, $k0, 0
197
 
317 palkovsky 198
	add $a0, $sp, 0 
199
	jal exception /* exception(register_space) */
313 palkovsky 200
	nop
201
 
202
	REGISTERS_LOAD $sp
203
	# The $sp is automatically restored to former value
204
	eret
205
	nop
206
 
1 jermar 207
tlb_refill_handler:
313 palkovsky 208
	KERNEL_STACK_TO_K0
209
	sub $k0, REGISTER_SPACE
210
	REGISTERS_STORE $k0
211
	add $sp, $k0, 0
125 jermar 212
 
317 palkovsky 213
	add $a0, $sp, 0 
214
	jal tlb_refill /* tlb_refill(register_space) */
50 jermar 215
	nop
125 jermar 216
 
306 palkovsky 217
	REGISTERS_LOAD $sp
125 jermar 218
 
50 jermar 219
	eret
306 palkovsky 220
	nop
1 jermar 221
 
222
cache_error_handler:
313 palkovsky 223
	KERNEL_STACK_TO_K0
306 palkovsky 224
	sub $sp, REGISTER_SPACE
225
	REGISTERS_STORE $sp
313 palkovsky 226
	add $sp, $k0, 0
1 jermar 227
 
50 jermar 228
	jal cache_error
229
	nop
125 jermar 230
 
306 palkovsky 231
	REGISTERS_LOAD $sp
1 jermar 232
 
50 jermar 233
	eret
308 jermar 234
	nop
313 palkovsky 235
 
236
userspace_asm:
237
	add $sp, $a0, 0
238
	eret
239
	nop
240