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| 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 |
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| 46 | 47 | ||
| - | 48 | # Save registers to space defined by \r |
|
| - | 49 | # We will change $at on the way |
|
| 47 | .macro REGISTERS_STORE r |
50 | .macro REGISTERS_STORE r |
| 48 | sw $at,EOFFSET_AT(\r) |
51 | sw $at,EOFFSET_AT(\r) |
| 49 | sw $v0,EOFFSET_V0(\r) |
52 | sw $v0,EOFFSET_V0(\r) |
| 50 | sw $v1,EOFFSET_V1(\r) |
53 | sw $v1,EOFFSET_V1(\r) |
| 51 | sw $a0,EOFFSET_A0(\r) |
54 | sw $a0,EOFFSET_A0(\r) |
| Line 60... | Line 63... | ||
| 60 | sw $t5,EOFFSET_T5(\r) |
63 | sw $t5,EOFFSET_T5(\r) |
| 61 | sw $t6,EOFFSET_T6(\r) |
64 | sw $t6,EOFFSET_T6(\r) |
| 62 | sw $t7,EOFFSET_T7(\r) |
65 | sw $t7,EOFFSET_T7(\r) |
| 63 | sw $t8,EOFFSET_T8(\r) |
66 | sw $t8,EOFFSET_T8(\r) |
| 64 | sw $t9,EOFFSET_T9(\r) |
67 | sw $t9,EOFFSET_T9(\r) |
| - | 68 | ||
| - | 69 | mflo $at |
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| - | 70 | sw $at, EOFFSET_LO(\r) |
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| - | 71 | mfhi $at |
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| - | 72 | sw $at, EOFFSET_HI(\r) |
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| - | 73 | ||
| 65 | sw $s0,EOFFSET_S0(\r) |
74 | sw $s0,EOFFSET_S0(\r) |
| 66 | sw $s1,EOFFSET_S1(\r) |
75 | sw $s1,EOFFSET_S1(\r) |
| 67 | sw $s2,EOFFSET_S2(\r) |
76 | sw $s2,EOFFSET_S2(\r) |
| 68 | sw $s3,EOFFSET_S3(\r) |
77 | sw $s3,EOFFSET_S3(\r) |
| 69 | sw $s4,EOFFSET_S4(\r) |
78 | sw $s4,EOFFSET_S4(\r) |
| Line 71... | Line 80... | ||
| 71 | sw $s6,EOFFSET_S6(\r) |
80 | sw $s6,EOFFSET_S6(\r) |
| 72 | sw $s7,EOFFSET_S7(\r) |
81 | sw $s7,EOFFSET_S7(\r) |
| 73 | sw $s8,EOFFSET_S8(\r) |
82 | sw $s8,EOFFSET_S8(\r) |
| 74 | sw $gp,EOFFSET_GP(\r) |
83 | sw $gp,EOFFSET_GP(\r) |
| 75 | sw $ra,EOFFSET_RA(\r) |
84 | sw $ra,EOFFSET_RA(\r) |
| 76 | mflo $k0 |
- | |
| 77 | mfhi $k1 |
- | |
| 78 | sw $k0,EOFFSET_LO(\r) |
85 | sw $sp,EOFFSET_SP(\r) |
| - | 86 | ||
| - | 87 | mfc0 $at, $status |
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| 79 | sw $k1,EOFFSET_HI(\r) |
88 | sw $at,EOFFSET_STATUS(\r) |
| 80 | .endm |
89 | .endm |
| 81 | 90 | ||
| 82 | .macro REGISTERS_LOAD r |
91 | .macro REGISTERS_LOAD r |
| 83 | lw $at,EOFFSET_AT(\r) |
- | |
| 84 | lw $v0,EOFFSET_V0(\r) |
92 | lw $v0,EOFFSET_V0(\r) |
| 85 | lw $v1,EOFFSET_V1(\r) |
93 | lw $v1,EOFFSET_V1(\r) |
| 86 | lw $a0,EOFFSET_A0(\r) |
94 | lw $a0,EOFFSET_A0(\r) |
| 87 | lw $a1,EOFFSET_A1(\r) |
95 | lw $a1,EOFFSET_A1(\r) |
| 88 | lw $a2,EOFFSET_A2(\r) |
96 | lw $a2,EOFFSET_A2(\r) |
| Line 107... | Line 115... | ||
| 107 | lw $s7,EOFFSET_S7(\r) |
115 | lw $s7,EOFFSET_S7(\r) |
| 108 | lw $s8,EOFFSET_S8(\r) |
116 | lw $s8,EOFFSET_S8(\r) |
| 109 | lw $gp,EOFFSET_GP(\r) |
117 | lw $gp,EOFFSET_GP(\r) |
| 110 | lw $ra,EOFFSET_RA(\r) |
118 | lw $ra,EOFFSET_RA(\r) |
| 111 | 119 | ||
| 112 | lw $k0,EOFFSET_LO(\r) |
120 | lw $at,EOFFSET_LO(\r) |
| - | 121 | mtlo $at |
|
| 113 | lw $k1,EOFFSET_HI(\r) |
122 | lw $at,EOFFSET_HI(\r) |
| 114 | mtlo $k0 |
123 | mthi $at |
| - | 124 | ||
| - | 125 | lw $at,EOFFSET_STATUS(\r) |
|
| 115 | mthi $k1 |
126 | mtc0 $at, $status |
| - | 127 | ||
| - | 128 | lw $at,EOFFSET_AT(\r) |
|
| - | 129 | lw $sp,EOFFSET_SP(\r) |
|
| 116 | .endm |
130 | .endm |
| 117 | 131 | ||
| - | 132 | # Move kernel stack pointer address to register K0 |
|
| - | 133 | # - if we are in user mode, load the appropriate stack |
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| - | 134 | # address |
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| - | 135 | .macro KERNEL_STACK_TO_K0 |
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| - | 136 | # If we are in user mode |
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| - | 137 | mfc0 $k0, $status |
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| - | 138 | andi $k0, 0x10 |
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| - | 139 | ||
| - | 140 | beq $k0, $0, 1f |
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| - | 141 | add $k0, $sp, 0 |
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| 118 | 142 | ||
| - | 143 | # Move $k0 pointer to kernel stack |
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| - | 144 | lui $k0, %hi(supervisor_sp) |
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| - | 145 | ori $k0, %lo(supervisor_sp) |
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| - | 146 | # Move $k0 (superveisor_sp) |
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| - | 147 | lw $k0, 0($k0) |
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| - | 148 | 1: |
|
| - | 149 | .endm |
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| - | 150 | ||
| 119 | .org 0x0 |
151 | .org 0x0 |
| 120 | tlb_refill_entry: |
152 | tlb_refill_entry: |
| 121 | j tlb_refill_handler |
153 | j tlb_refill_handler |
| 122 | nop |
154 | nop |
| 123 | 155 | ||
| Line 125... | Line 157... | ||
| 125 | cache_error_entry: |
157 | cache_error_entry: |
| 126 | j cache_error_handler |
158 | j cache_error_handler |
| 127 | nop |
159 | nop |
| 128 | 160 | ||
| 129 | .org 0x180 |
161 | .org 0x180 |
| 130 | exception_entry: |
162 | norm_exception: |
| 131 | exception_handler: |
163 | j exception_handler |
| 132 | sub $sp, REGISTER_SPACE |
- | |
| 133 | REGISTERS_STORE $sp |
- | |
| 134 | - | ||
| 135 | jal exception |
- | |
| 136 | nop |
164 | nop |
| 137 | 165 | ||
| 138 | REGISTERS_LOAD $sp |
166 | .org 0x200 |
| 139 | add $sp, REGISTER_SPACE |
167 | iv_exception: |
| 140 | - | ||
| 141 | eret |
168 | j exception_handler |
| 142 | nop |
169 | nop |
| 143 | 170 | ||
| 144 | .org KA2PA(0x80000300) |
171 | .org KA2PA(KERNEL_STARTUP_ADDRESS) |
| 145 | kernel_image_start: |
172 | kernel_image_start: |
| 146 | /* Load temporary stack */ |
173 | /* Load temporary stack */ |
| 147 | lui $sp, (TEMP_STACK_START + TEMP_STACK_SIZE) >> 16 |
174 | lui $sp, %hi(end_stack) |
| 148 | ori $sp, (TEMP_STACK_START + TEMP_STACK_SIZE) & 0xffff |
175 | ori $sp, $0, %lo(end_stack) |
| 149 | 176 | ||
| 150 | /* Not sure about this, but might be needed for PIC code???? */ |
177 | /* Not sure about this, but might be needed for PIC code???? */ |
| 151 | lui $gp, 0x8000 |
178 | lui $gp, 0x8000 |
| 152 | 179 | ||
| 153 | jal main_bsp |
180 | jal main_bsp |
| 154 | nop |
181 | nop |
| 155 | 182 | ||
| 156 | .org KA2PA(TEMP_STACK_START) |
- | |
| - | 183 | ||
| 157 | .space TEMP_STACK_SIZE |
184 | .space TEMP_STACK_SIZE |
| - | 185 | end_stack: |
|
| - | 186 | ||
| - | 187 | exception_handler: |
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| - | 188 | exception_entry: |
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| - | 189 | KERNEL_STACK_TO_K0 |
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| - | 190 | sub $k0, REGISTER_SPACE |
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| - | 191 | REGISTERS_STORE $k0 |
|
| - | 192 | add $sp, $k0, 0 |
|
| - | 193 | ||
| - | 194 | jal exception |
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| - | 195 | nop |
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| - | 196 | ||
| - | 197 | REGISTERS_LOAD $sp |
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| - | 198 | # The $sp is automatically restored to former value |
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| - | 199 | eret |
|
| - | 200 | nop |
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| 158 | 201 | ||
| 159 | tlb_refill_handler: |
202 | tlb_refill_handler: |
| - | 203 | KERNEL_STACK_TO_K0 |
|
| 160 | sub $sp, REGISTER_SPACE |
204 | sub $k0, REGISTER_SPACE |
| 161 | REGISTERS_STORE $sp |
205 | REGISTERS_STORE $k0 |
| - | 206 | add $sp, $k0, 0 |
|
| 162 | 207 | ||
| 163 | jal tlb_refill |
208 | jal tlb_refill |
| 164 | nop |
209 | nop |
| 165 | 210 | ||
| 166 | REGISTERS_LOAD $sp |
211 | REGISTERS_LOAD $sp |
| 167 | add $sp, REGISTER_SPACE |
- | |
| 168 | 212 | ||
| 169 | eret |
213 | eret |
| 170 | nop |
214 | nop |
| 171 | 215 | ||
| 172 | cache_error_handler: |
216 | cache_error_handler: |
| - | 217 | KERNEL_STACK_TO_K0 |
|
| 173 | sub $sp, REGISTER_SPACE |
218 | sub $sp, REGISTER_SPACE |
| 174 | REGISTERS_STORE $sp |
219 | REGISTERS_STORE $sp |
| - | 220 | add $sp, $k0, 0 |
|
| 175 | 221 | ||
| 176 | jal cache_error |
222 | jal cache_error |
| 177 | nop |
223 | nop |
| 178 | 224 | ||
| 179 | REGISTERS_LOAD $sp |
225 | REGISTERS_LOAD $sp |
| 180 | add $sp, REGISTER_SPACE |
- | |
| 181 | 226 | ||
| 182 | eret |
227 | eret |
| 183 | nop |
228 | nop |
| - | 229 | ||
| - | 230 | userspace_asm: |
|
| - | 231 | .word 0x29 |
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| - | 232 | add $sp, $a0, 0 |
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| - | 233 | eret |
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| - | 234 | nop |
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| - | 235 | ||