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1 | # |
1 | # |
2 | # Copyright (C) 2001-2004 Jakub Jermar |
2 | # Copyright (C) 2001-2004 Jakub Jermar |
3 | # All rights reserved. |
3 | # All rights reserved. |
4 | # |
4 | # |
5 | # Redistribution and use in source and binary forms, with or without |
5 | # Redistribution and use in source and binary forms, with or without |
6 | # modification, are permitted provided that the following conditions |
6 | # modification, are permitted provided that the following conditions |
7 | # are met: |
7 | # are met: |
8 | # |
8 | # |
9 | # - Redistributions of source code must retain the above copyright |
9 | # - Redistributions of source code must retain the above copyright |
10 | # notice, this list of conditions and the following disclaimer. |
10 | # notice, this list of conditions and the following disclaimer. |
11 | # - Redistributions in binary form must reproduce the above copyright |
11 | # - Redistributions in binary form must reproduce the above copyright |
12 | # notice, this list of conditions and the following disclaimer in the |
12 | # notice, this list of conditions and the following disclaimer in the |
13 | # documentation and/or other materials provided with the distribution. |
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 |
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. |
15 | # derived from this software without specific prior written permission. |
16 | # |
16 | # |
17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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 |
18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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 |
23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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 |
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. |
26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | # |
27 | # |
28 | 28 | ||
29 | #define __ASM__ |
29 | #define __ASM__ |
30 | 30 | ||
31 | #include <arch/asm/regname.h> |
31 | #include <arch/asm/regname.h> |
32 | #include <arch/mm/page.h> |
32 | #include <arch/mm/page.h> |
33 | #include <arch/asm/boot.h> |
33 | #include <arch/asm/boot.h> |
34 | #include <arch/context.h> |
34 | #include <arch/context.h> |
35 | 35 | ||
36 | .text |
36 | .text |
37 | 37 | ||
38 | .set noat |
38 | .set noat |
39 | .set noreorder |
39 | .set noreorder |
40 | .set nomacro |
40 | .set nomacro |
41 | 41 | ||
42 | .global kernel_image_start |
42 | .global kernel_image_start |
43 | .global tlb_refill_entry |
43 | .global tlb_refill_entry |
44 | .global cache_error_entry |
44 | .global cache_error_entry |
45 | .global exception_entry |
45 | .global exception_entry |
46 | .global userspace_asm |
46 | .global userspace_asm |
47 | 47 | ||
48 | # Save registers to space defined by \r |
48 | # Save registers to space defined by \r |
49 | # We will change $at on the way |
49 | # We will change $at on the way |
50 | .macro REGISTERS_STORE r |
50 | .macro REGISTERS_STORE r |
51 | sw $at,EOFFSET_AT(\r) |
51 | sw $at,EOFFSET_AT(\r) |
52 | sw $v0,EOFFSET_V0(\r) |
52 | sw $v0,EOFFSET_V0(\r) |
53 | sw $v1,EOFFSET_V1(\r) |
53 | sw $v1,EOFFSET_V1(\r) |
54 | sw $a0,EOFFSET_A0(\r) |
54 | sw $a0,EOFFSET_A0(\r) |
55 | sw $a1,EOFFSET_A1(\r) |
55 | sw $a1,EOFFSET_A1(\r) |
56 | sw $a2,EOFFSET_A2(\r) |
56 | sw $a2,EOFFSET_A2(\r) |
57 | sw $a3,EOFFSET_A3(\r) |
57 | sw $a3,EOFFSET_A3(\r) |
58 | sw $t0,EOFFSET_A4(\r) |
58 | sw $t0,EOFFSET_A4(\r) |
59 | sw $t1,EOFFSET_T1(\r) |
59 | sw $t1,EOFFSET_T1(\r) |
60 | sw $t2,EOFFSET_T2(\r) |
60 | sw $t2,EOFFSET_T2(\r) |
61 | sw $t3,EOFFSET_T3(\r) |
61 | sw $t3,EOFFSET_T3(\r) |
62 | sw $t4,EOFFSET_T4(\r) |
62 | sw $t4,EOFFSET_T4(\r) |
63 | sw $t5,EOFFSET_T5(\r) |
63 | sw $t5,EOFFSET_T5(\r) |
64 | sw $t6,EOFFSET_T6(\r) |
64 | sw $t6,EOFFSET_T6(\r) |
65 | sw $t7,EOFFSET_T7(\r) |
65 | sw $t7,EOFFSET_T7(\r) |
66 | sw $t8,EOFFSET_T8(\r) |
66 | sw $t8,EOFFSET_T8(\r) |
67 | sw $t9,EOFFSET_T9(\r) |
67 | sw $t9,EOFFSET_T9(\r) |
68 | 68 | ||
69 | mflo $at |
69 | mflo $at |
70 | sw $at, EOFFSET_LO(\r) |
70 | sw $at, EOFFSET_LO(\r) |
71 | mfhi $at |
71 | mfhi $at |
72 | sw $at, EOFFSET_HI(\r) |
72 | sw $at, EOFFSET_HI(\r) |
73 | 73 | ||
74 | sw $s0,EOFFSET_S0(\r) |
74 | sw $s0,EOFFSET_S0(\r) |
75 | sw $s1,EOFFSET_S1(\r) |
75 | sw $s1,EOFFSET_S1(\r) |
76 | sw $s2,EOFFSET_S2(\r) |
76 | sw $s2,EOFFSET_S2(\r) |
77 | sw $s3,EOFFSET_S3(\r) |
77 | sw $s3,EOFFSET_S3(\r) |
78 | sw $s4,EOFFSET_S4(\r) |
78 | sw $s4,EOFFSET_S4(\r) |
79 | sw $s5,EOFFSET_S5(\r) |
79 | sw $s5,EOFFSET_S5(\r) |
80 | sw $s6,EOFFSET_S6(\r) |
80 | sw $s6,EOFFSET_S6(\r) |
81 | sw $s7,EOFFSET_S7(\r) |
81 | sw $s7,EOFFSET_S7(\r) |
82 | sw $s8,EOFFSET_S8(\r) |
82 | sw $s8,EOFFSET_S8(\r) |
83 | sw $gp,EOFFSET_GP(\r) |
83 | sw $gp,EOFFSET_GP(\r) |
84 | sw $ra,EOFFSET_RA(\r) |
84 | sw $ra,EOFFSET_RA(\r) |
85 | sw $sp,EOFFSET_SP(\r) |
85 | sw $sp,EOFFSET_SP(\r) |
86 | 86 | ||
87 | mfc0 $at, $status |
87 | mfc0 $at, $status |
88 | sw $at,EOFFSET_STATUS(\r) |
88 | sw $at,EOFFSET_STATUS(\r) |
89 | .endm |
89 | .endm |
90 | 90 | ||
91 | .macro REGISTERS_LOAD r |
91 | .macro REGISTERS_LOAD r |
92 | lw $v0,EOFFSET_V0(\r) |
92 | lw $v0,EOFFSET_V0(\r) |
93 | lw $v1,EOFFSET_V1(\r) |
93 | lw $v1,EOFFSET_V1(\r) |
94 | lw $a0,EOFFSET_A0(\r) |
94 | lw $a0,EOFFSET_A0(\r) |
95 | lw $a1,EOFFSET_A1(\r) |
95 | lw $a1,EOFFSET_A1(\r) |
96 | lw $a2,EOFFSET_A2(\r) |
96 | lw $a2,EOFFSET_A2(\r) |
97 | lw $a3,EOFFSET_A3(\r) |
97 | lw $a3,EOFFSET_A3(\r) |
98 | lw $t0,EOFFSET_A4(\r) |
98 | lw $t0,EOFFSET_A4(\r) |
99 | lw $t1,EOFFSET_T1(\r) |
99 | lw $t1,EOFFSET_T1(\r) |
100 | lw $t2,EOFFSET_T2(\r) |
100 | lw $t2,EOFFSET_T2(\r) |
101 | lw $t3,EOFFSET_T3(\r) |
101 | lw $t3,EOFFSET_T3(\r) |
102 | lw $t4,EOFFSET_T4(\r) |
102 | lw $t4,EOFFSET_T4(\r) |
103 | lw $t5,EOFFSET_T5(\r) |
103 | lw $t5,EOFFSET_T5(\r) |
104 | lw $t6,EOFFSET_T6(\r) |
104 | lw $t6,EOFFSET_T6(\r) |
105 | lw $t7,EOFFSET_T7(\r) |
105 | lw $t7,EOFFSET_T7(\r) |
106 | lw $t8,EOFFSET_T8(\r) |
106 | lw $t8,EOFFSET_T8(\r) |
107 | lw $t9,EOFFSET_T9(\r) |
107 | lw $t9,EOFFSET_T9(\r) |
108 | lw $s0,EOFFSET_S0(\r) |
108 | lw $s0,EOFFSET_S0(\r) |
109 | lw $s1,EOFFSET_S1(\r) |
109 | lw $s1,EOFFSET_S1(\r) |
110 | lw $s2,EOFFSET_S2(\r) |
110 | lw $s2,EOFFSET_S2(\r) |
111 | lw $s3,EOFFSET_S3(\r) |
111 | lw $s3,EOFFSET_S3(\r) |
112 | lw $s4,EOFFSET_S4(\r) |
112 | lw $s4,EOFFSET_S4(\r) |
113 | lw $s5,EOFFSET_S5(\r) |
113 | lw $s5,EOFFSET_S5(\r) |
114 | lw $s6,EOFFSET_S6(\r) |
114 | lw $s6,EOFFSET_S6(\r) |
115 | lw $s7,EOFFSET_S7(\r) |
115 | lw $s7,EOFFSET_S7(\r) |
116 | lw $s8,EOFFSET_S8(\r) |
116 | lw $s8,EOFFSET_S8(\r) |
117 | lw $gp,EOFFSET_GP(\r) |
117 | lw $gp,EOFFSET_GP(\r) |
118 | lw $ra,EOFFSET_RA(\r) |
118 | lw $ra,EOFFSET_RA(\r) |
119 | 119 | ||
120 | lw $at,EOFFSET_LO(\r) |
120 | lw $at,EOFFSET_LO(\r) |
121 | mtlo $at |
121 | mtlo $at |
122 | lw $at,EOFFSET_HI(\r) |
122 | lw $at,EOFFSET_HI(\r) |
123 | mthi $at |
123 | mthi $at |
124 | 124 | ||
125 | lw $at,EOFFSET_STATUS(\r) |
125 | lw $at,EOFFSET_STATUS(\r) |
126 | mtc0 $at, $status |
126 | mtc0 $at, $status |
127 | 127 | ||
128 | lw $at,EOFFSET_AT(\r) |
128 | lw $at,EOFFSET_AT(\r) |
129 | lw $sp,EOFFSET_SP(\r) |
129 | lw $sp,EOFFSET_SP(\r) |
130 | .endm |
130 | .endm |
131 | 131 | ||
132 | # Move kernel stack pointer address to register K0 |
132 | # Move kernel stack pointer address to register K0 |
133 | # - if we are in user mode, load the appropriate stack |
133 | # - if we are in user mode, load the appropriate stack |
134 | # address |
134 | # address |
135 | .macro KERNEL_STACK_TO_K0 |
135 | .macro KERNEL_STACK_TO_K0 |
136 | # If we are in user mode |
136 | # If we are in user mode |
137 | mfc0 $k0, $status |
137 | mfc0 $k0, $status |
138 | andi $k0, 0x10 |
138 | andi $k0, 0x10 |
139 | 139 | ||
140 | beq $k0, $0, 1f |
140 | beq $k0, $0, 1f |
141 | add $k0, $sp, 0 |
141 | add $k0, $sp, 0 |
142 | 142 | ||
143 | # Move $k0 pointer to kernel stack |
143 | # Move $k0 pointer to kernel stack |
144 | lui $k0, %hi(supervisor_sp) |
144 | lui $k0, %hi(supervisor_sp) |
145 | ori $k0, %lo(supervisor_sp) |
145 | ori $k0, %lo(supervisor_sp) |
146 | # Move $k0 (superveisor_sp) |
146 | # Move $k0 (superveisor_sp) |
147 | lw $k0, 0($k0) |
147 | lw $k0, 0($k0) |
148 | 1: |
148 | 1: |
149 | .endm |
149 | .endm |
150 | 150 | ||
151 | .org 0x0 |
151 | .org 0x0 |
152 | tlb_refill_entry: |
152 | tlb_refill_entry: |
153 | j tlb_refill_handler |
153 | j tlb_refill_handler |
154 | nop |
154 | nop |
155 | 155 | ||
156 | .org 0x100 |
156 | .org 0x100 |
157 | cache_error_entry: |
157 | cache_error_entry: |
158 | j cache_error_handler |
158 | j cache_error_handler |
159 | nop |
159 | nop |
160 | 160 | ||
161 | .org 0x180 |
161 | .org 0x180 |
162 | norm_exception: |
162 | norm_exception: |
163 | j exception_handler |
163 | j exception_handler |
164 | nop |
164 | nop |
165 | 165 | ||
166 | .org 0x200 |
166 | .org 0x200 |
167 | iv_exception: |
167 | iv_exception: |
168 | j exception_handler |
168 | j exception_handler |
169 | nop |
169 | nop |
170 | 170 | ||
171 | .org KA2PA(KERNEL_STARTUP_ADDRESS) |
171 | .org KA2PA(KERNEL_STARTUP_ADDRESS) |
172 | kernel_image_start: |
172 | kernel_image_start: |
173 | /* Load temporary stack */ |
173 | /* Load temporary stack */ |
174 | lui $sp, %hi(end_stack) |
174 | lui $sp, %hi(end_stack) |
175 | ori $sp, $0, %lo(end_stack) |
175 | ori $sp, $0, %lo(end_stack) |
176 | 176 | ||
177 | /* Not sure about this, but might be needed for PIC code???? */ |
177 | /* Not sure about this, but might be needed for PIC code???? */ |
178 | lui $gp, 0x8000 |
178 | lui $gp, 0x8000 |
179 | 179 | ||
180 | jal main_bsp |
180 | jal main_bsp |
181 | nop |
181 | nop |
182 | 182 | ||
183 | 183 | ||
184 | .space TEMP_STACK_SIZE |
184 | .space TEMP_STACK_SIZE |
185 | end_stack: |
185 | end_stack: |
186 | 186 | ||
187 | exception_handler: |
187 | exception_handler: |
188 | exception_entry: |
188 | exception_entry: |
189 | KERNEL_STACK_TO_K0 |
189 | KERNEL_STACK_TO_K0 |
190 | sub $k0, REGISTER_SPACE |
190 | sub $k0, REGISTER_SPACE |
191 | REGISTERS_STORE $k0 |
191 | REGISTERS_STORE $k0 |
192 | add $sp, $k0, 0 |
192 | add $sp, $k0, 0 |
193 | 193 | ||
194 | jal exception |
194 | jal exception |
195 | nop |
195 | nop |
196 | 196 | ||
197 | REGISTERS_LOAD $sp |
197 | REGISTERS_LOAD $sp |
198 | # The $sp is automatically restored to former value |
198 | # The $sp is automatically restored to former value |
199 | eret |
199 | eret |
200 | nop |
200 | nop |
201 | 201 | ||
202 | tlb_refill_handler: |
202 | tlb_refill_handler: |
203 | KERNEL_STACK_TO_K0 |
203 | KERNEL_STACK_TO_K0 |
204 | sub $k0, REGISTER_SPACE |
204 | sub $k0, REGISTER_SPACE |
205 | REGISTERS_STORE $k0 |
205 | REGISTERS_STORE $k0 |
206 | add $sp, $k0, 0 |
206 | add $sp, $k0, 0 |
207 | 207 | ||
208 | jal tlb_refill |
208 | jal tlb_refill |
209 | nop |
209 | nop |
210 | 210 | ||
211 | REGISTERS_LOAD $sp |
211 | REGISTERS_LOAD $sp |
212 | 212 | ||
213 | eret |
213 | eret |
214 | nop |
214 | nop |
215 | 215 | ||
216 | cache_error_handler: |
216 | cache_error_handler: |
217 | KERNEL_STACK_TO_K0 |
217 | KERNEL_STACK_TO_K0 |
218 | sub $sp, REGISTER_SPACE |
218 | sub $sp, REGISTER_SPACE |
219 | REGISTERS_STORE $sp |
219 | REGISTERS_STORE $sp |
220 | add $sp, $k0, 0 |
220 | add $sp, $k0, 0 |
221 | 221 | ||
222 | jal cache_error |
222 | jal cache_error |
223 | nop |
223 | nop |
224 | 224 | ||
225 | REGISTERS_LOAD $sp |
225 | REGISTERS_LOAD $sp |
226 | 226 | ||
227 | eret |
227 | eret |
228 | nop |
228 | nop |
229 | 229 | ||
230 | userspace_asm: |
230 | userspace_asm: |
231 | .word 0x29 |
- | |
232 | add $sp, $a0, 0 |
231 | add $sp, $a0, 0 |
233 | eret |
232 | eret |
234 | nop |
233 | nop |
235 | 234 | ||
236 | 235 |