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308 | jermar | 1 | # |
1 | jermar | 2 | # Copyright (C) 2001-2004 Jakub Jermar |
3 | # All rights reserved. |
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4 | # |
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5 | # Redistribution and use in source and binary forms, with or without |
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6 | # modification, are permitted provided that the following conditions |
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7 | # are met: |
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8 | # |
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9 | # - Redistributions of source code must retain the above copyright |
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10 | # notice, this list of conditions and the following disclaimer. |
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11 | # - Redistributions in binary form must reproduce the above copyright |
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12 | # notice, this list of conditions and the following disclaimer in the |
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13 | # documentation and/or other materials provided with the distribution. |
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14 | # - The name of the author may not be used to endorse or promote products |
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15 | # derived from this software without specific prior written permission. |
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16 | # |
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17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | # |
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28 | |||
306 | palkovsky | 29 | #define __ASM__ |
30 | |||
31 | #include <arch/asm/regname.h> |
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32 | #include <arch/mm/page.h> |
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33 | #include <arch/asm/boot.h> |
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317 | palkovsky | 34 | #include <arch/context_offset.h> |
306 | palkovsky | 35 | |
1 | jermar | 36 | .text |
37 | |||
38 | .set noat |
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39 | .set noreorder |
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40 | .set nomacro |
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41 | |||
42 | .global kernel_image_start |
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43 | .global tlb_refill_entry |
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44 | .global cache_error_entry |
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45 | .global exception_entry |
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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 |
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306 | palkovsky | 50 | .macro REGISTERS_STORE r |
51 | sw $at,EOFFSET_AT(\r) |
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52 | sw $v0,EOFFSET_V0(\r) |
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53 | sw $v1,EOFFSET_V1(\r) |
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54 | sw $a0,EOFFSET_A0(\r) |
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55 | sw $a1,EOFFSET_A1(\r) |
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56 | sw $a2,EOFFSET_A2(\r) |
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57 | sw $a3,EOFFSET_A3(\r) |
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317 | palkovsky | 58 | sw $t0,EOFFSET_T0(\r) |
306 | palkovsky | 59 | sw $t1,EOFFSET_T1(\r) |
60 | sw $t2,EOFFSET_T2(\r) |
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61 | sw $t3,EOFFSET_T3(\r) |
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62 | sw $t4,EOFFSET_T4(\r) |
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63 | sw $t5,EOFFSET_T5(\r) |
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64 | sw $t6,EOFFSET_T6(\r) |
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65 | sw $t7,EOFFSET_T7(\r) |
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66 | sw $t8,EOFFSET_T8(\r) |
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67 | sw $t9,EOFFSET_T9(\r) |
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313 | palkovsky | 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 | |||
306 | palkovsky | 74 | sw $s0,EOFFSET_S0(\r) |
75 | sw $s1,EOFFSET_S1(\r) |
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76 | sw $s2,EOFFSET_S2(\r) |
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77 | sw $s3,EOFFSET_S3(\r) |
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78 | sw $s4,EOFFSET_S4(\r) |
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79 | sw $s5,EOFFSET_S5(\r) |
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80 | sw $s6,EOFFSET_S6(\r) |
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81 | sw $s7,EOFFSET_S7(\r) |
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82 | sw $s8,EOFFSET_S8(\r) |
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83 | sw $gp,EOFFSET_GP(\r) |
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84 | sw $ra,EOFFSET_RA(\r) |
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313 | palkovsky | 85 | sw $sp,EOFFSET_SP(\r) |
86 | |||
87 | mfc0 $at, $status |
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88 | sw $at,EOFFSET_STATUS(\r) |
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317 | palkovsky | 89 | mfc0 $at, $epc |
90 | sw $at,EOFFSET_EPC(\r) |
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306 | palkovsky | 91 | .endm |
92 | |||
93 | .macro REGISTERS_LOAD r |
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94 | lw $v0,EOFFSET_V0(\r) |
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95 | lw $v1,EOFFSET_V1(\r) |
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96 | lw $a0,EOFFSET_A0(\r) |
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97 | lw $a1,EOFFSET_A1(\r) |
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98 | lw $a2,EOFFSET_A2(\r) |
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99 | lw $a3,EOFFSET_A3(\r) |
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317 | palkovsky | 100 | lw $t0,EOFFSET_T0(\r) |
306 | palkovsky | 101 | lw $t1,EOFFSET_T1(\r) |
102 | lw $t2,EOFFSET_T2(\r) |
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103 | lw $t3,EOFFSET_T3(\r) |
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104 | lw $t4,EOFFSET_T4(\r) |
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105 | lw $t5,EOFFSET_T5(\r) |
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106 | lw $t6,EOFFSET_T6(\r) |
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107 | lw $t7,EOFFSET_T7(\r) |
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108 | lw $t8,EOFFSET_T8(\r) |
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109 | lw $t9,EOFFSET_T9(\r) |
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110 | lw $s0,EOFFSET_S0(\r) |
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111 | lw $s1,EOFFSET_S1(\r) |
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112 | lw $s2,EOFFSET_S2(\r) |
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113 | lw $s3,EOFFSET_S3(\r) |
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114 | lw $s4,EOFFSET_S4(\r) |
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115 | lw $s5,EOFFSET_S5(\r) |
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116 | lw $s6,EOFFSET_S6(\r) |
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117 | lw $s7,EOFFSET_S7(\r) |
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118 | lw $s8,EOFFSET_S8(\r) |
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119 | lw $gp,EOFFSET_GP(\r) |
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120 | lw $ra,EOFFSET_RA(\r) |
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121 | |||
313 | palkovsky | 122 | lw $at,EOFFSET_LO(\r) |
123 | mtlo $at |
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124 | lw $at,EOFFSET_HI(\r) |
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125 | mthi $at |
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126 | |||
127 | lw $at,EOFFSET_STATUS(\r) |
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128 | mtc0 $at, $status |
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317 | palkovsky | 129 | lw $at,EOFFSET_EPC(\r) |
130 | mtc0 $at, $epc |
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313 | palkovsky | 131 | |
132 | lw $at,EOFFSET_AT(\r) |
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133 | lw $sp,EOFFSET_SP(\r) |
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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 |
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138 | # address |
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139 | .macro KERNEL_STACK_TO_K0 |
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140 | # If we are in user mode |
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141 | mfc0 $k0, $status |
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142 | andi $k0, 0x10 |
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306 | palkovsky | 143 | |
313 | palkovsky | 144 | beq $k0, $0, 1f |
145 | add $k0, $sp, 0 |
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146 | |||
147 | # Move $k0 pointer to kernel stack |
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148 | lui $k0, %hi(supervisor_sp) |
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149 | ori $k0, %lo(supervisor_sp) |
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150 | # Move $k0 (superveisor_sp) |
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151 | lw $k0, 0($k0) |
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152 | 1: |
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153 | .endm |
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154 | |||
1 | jermar | 155 | .org 0x0 |
156 | tlb_refill_entry: |
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50 | jermar | 157 | j tlb_refill_handler |
158 | nop |
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1 | jermar | 159 | |
160 | .org 0x100 |
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161 | cache_error_entry: |
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50 | jermar | 162 | j cache_error_handler |
163 | nop |
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125 | jermar | 164 | |
1 | jermar | 165 | .org 0x180 |
313 | palkovsky | 166 | norm_exception: |
167 | j exception_handler |
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168 | nop |
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125 | jermar | 169 | |
313 | palkovsky | 170 | .org 0x200 |
171 | iv_exception: |
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172 | j exception_handler |
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173 | nop |
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125 | jermar | 174 | |
313 | palkovsky | 175 | .org KA2PA(KERNEL_STARTUP_ADDRESS) |
306 | palkovsky | 176 | kernel_image_start: |
177 | /* Load temporary stack */ |
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313 | palkovsky | 178 | lui $sp, %hi(end_stack) |
179 | ori $sp, $0, %lo(end_stack) |
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306 | palkovsky | 180 | |
181 | /* Not sure about this, but might be needed for PIC code???? */ |
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182 | lui $gp, 0x8000 |
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183 | |||
184 | jal main_bsp |
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185 | nop |
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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: |
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193 | KERNEL_STACK_TO_K0 |
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194 | sub $k0, REGISTER_SPACE |
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195 | REGISTERS_STORE $k0 |
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196 | add $sp, $k0, 0 |
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197 | |||
317 | palkovsky | 198 | add $a0, $sp, 0 |
199 | jal exception /* exception(register_space) */ |
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313 | palkovsky | 200 | nop |
201 | |||
202 | REGISTERS_LOAD $sp |
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203 | # The $sp is automatically restored to former value |
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204 | eret |
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205 | nop |
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206 | |||
1 | jermar | 207 | tlb_refill_handler: |
313 | palkovsky | 208 | KERNEL_STACK_TO_K0 |
209 | sub $k0, REGISTER_SPACE |
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210 | REGISTERS_STORE $k0 |
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211 | add $sp, $k0, 0 |
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125 | jermar | 212 | |
317 | palkovsky | 213 | add $a0, $sp, 0 |
214 | jal tlb_refill /* tlb_refill(register_space) */ |
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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: |
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313 | palkovsky | 223 | KERNEL_STACK_TO_K0 |
306 | palkovsky | 224 | sub $sp, REGISTER_SPACE |
225 | REGISTERS_STORE $sp |
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313 | palkovsky | 226 | add $sp, $k0, 0 |
1 | jermar | 227 | |
50 | jermar | 228 | jal cache_error |
229 | nop |
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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: |
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237 | add $sp, $a0, 0 |
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238 | eret |
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239 | nop |
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240 |