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annotate packages/hal/mips/vrc437x/current/src/pmon.S @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
parents 9160a8005d76
children d2c90368aeef
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1 //========================================================================
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2 //
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3 // pmon.S
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4 //
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5 // Low-level entry points into PMON monitor.
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6 //
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7 //========================================================================
208
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8 //####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later version.
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16 //
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 // for more details.
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21 //
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22 // You should have received a copy of the GNU General Public License along
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23 // with eCos; if not, write to the Free Software Foundation, Inc.,
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 //
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26 // As a special exception, if other files instantiate templates or use macros
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27 // or inline functions from this file, or you compile this file and link it
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28 // with other works to produce a work based on this file, this file does not
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29 // by itself cause the resulting work to be covered by the GNU General Public
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30 // License. However the source code for this file must still be made available
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31 // in accordance with section (3) of the GNU General Public License.
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32 //
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33 // This exception does not invalidate any other reasons why a work based on
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34 // this file might be covered by the GNU General Public License.
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35 //
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 // at http://sources.redhat.com/ecos/ecos-license
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
183
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40 //========================================================================
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41 //#####DESCRIPTIONBEGIN####
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42 //
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43 // Author(s): Red Hat, nickg
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44 // Contributors: Red Hat, nickg
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45 // Date: 1999-04-21
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46 // Purpose:
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47 // Description: Low-level entry points into PMON monitor.
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48 // Usage:
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49 //
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50 //####DESCRIPTIONEND####
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51 //
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52 //========================================================================
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53
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54
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55 #ifdef __mips16
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56 /* This file contains 32 bit assembly code. */
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57 .set nomips16
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58 #endif
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59
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60 #if __mips < 3
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61 /* This machine does not support 64-bit operations. */
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62 #define ADDU addu
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63 #define SUBU subu
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64 #else
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65 /* This machine supports 64-bit operations. */
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66 #define ADDU daddu
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67 #define SUBU dsubu
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68 #endif
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69
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70
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71 /* Standard MIPS register names: */
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72 #define zero $0
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73 #define z0 $0
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74 #define v0 $2
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75 #define v1 $3
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76 #define a0 $4
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77 #define a1 $5
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78 #define a2 $6
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79 #define a3 $7
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80 #define t0 $8
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81 #define t1 $9
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82 #define t2 $10
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83 #define t3 $11
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84 #define t4 $12
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85 #define t5 $13
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86 #define t6 $14
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87 #define t7 $15
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88 #define s0 $16
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89 #define s1 $17
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90 #define s2 $18
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91 #define s3 $19
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92 #define s4 $20
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93 #define s5 $21
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94 #define s6 $22
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95 #define s7 $23
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96 #define t8 $24
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97 #define t9 $25
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98 #define k0 $26 /* kernel private register 0 */
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99 #define k1 $27 /* kernel private register 1 */
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100 #define gp $28 /* global data pointer */
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101 #define sp $29 /* stack-pointer */
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102 #define fp $30 /* frame-pointer */
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103 #define ra $31 /* return address */
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104 #define pc $pc /* pc, used on mips16 */
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105
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106 #define fp0 $f0
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107 #define fp1 $f1
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108
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109 /* Useful memory constants: */
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110 #define K0BASE 0x80000000
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111 #ifndef __mips64
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112 #define K1BASE 0xA0000000
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113 #else
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114 #define K1BASE 0xFFFFFFFFA0000000LL
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115 #endif
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116
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117 #define PHYS_TO_K1(a) ((unsigned)(a) | K1BASE)
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118
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119 /* Standard Co-Processor 0 register numbers: */
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120 #define C0_COUNT $9 /* Count Register */
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121 #define C0_SR $12 /* Status Register */
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122 #define C0_CAUSE $13 /* last exception description */
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123 #define C0_EPC $14 /* Exception error address */
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124 #define C0_CONFIG $16 /* CPU configuration */
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125
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126 /* Standard Status Register bitmasks: */
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127 #define SR_CU1 0x20000000 /* Mark CP1 as usable */
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128 #define SR_FR 0x04000000 /* Enable MIPS III FP registers */
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129 #define SR_BEV 0x00400000 /* Controls location of exception vectors */
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130 #define SR_PE 0x00100000 /* Mark soft reset (clear parity error) */
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131
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132 #define SR_KX 0x00000080 /* Kernel extended addressing enabled */
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133 #define SR_SX 0x00000040 /* Supervisor extended addressing enabled */
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134 #define SR_UX 0x00000020 /* User extended addressing enabled */
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135
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136 /* Standard (R4000) cache operations. Taken from "MIPS R4000
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137 Microprocessor User's Manual" 2nd edition: */
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138
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139 #define CACHE_I (0) /* primary instruction */
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140 #define CACHE_D (1) /* primary data */
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141 #define CACHE_SI (2) /* secondary instruction */
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142 #define CACHE_SD (3) /* secondary data (or combined instruction/data) */
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143
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144 #define INDEX_INVALIDATE (0) /* also encodes WRITEBACK if CACHE_D or CACHE_SD */
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145 #define INDEX_LOAD_TAG (1)
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146 #define INDEX_STORE_TAG (2)
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147 #define CREATE_DIRTY_EXCLUSIVE (3) /* CACHE_D and CACHE_SD only */
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148 #define HIT_INVALIDATE (4)
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149 #define CACHE_FILL (5) /* CACHE_I only */
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150 #define HIT_WRITEBACK_INVALIDATE (5) /* CACHE_D and CACHE_SD only */
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151 #define HIT_WRITEBACK (6) /* CACHE_I, CACHE_D and CACHE_SD only */
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152 #define HIT_SET_VIRTUAL (7) /* CACHE_SI and CACHE_SD only */
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153
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154 #define BUILD_CACHE_OP(o,c) (((o) << 2) | (c))
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155
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156 /* Individual cache operations: */
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157 #define INDEX_INVALIDATE_I BUILD_CACHE_OP(INDEX_INVALIDATE,CACHE_I)
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158 #define INDEX_WRITEBACK_INVALIDATE_D BUILD_CACHE_OP(INDEX_INVALIDATE,CACHE_D)
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159 #define INDEX_INVALIDATE_SI BUILD_CACHE_OP(INDEX_INVALIDATE,CACHE_SI)
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160 #define INDEX_WRITEBACK_INVALIDATE_SD BUILD_CACHE_OP(INDEX_INVALIDATE,CACHE_SD)
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161
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162 #define INDEX_LOAD_TAG_I BUILD_CACHE_OP(INDEX_LOAD_TAG,CACHE_I)
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163 #define INDEX_LOAD_TAG_D BUILD_CACHE_OP(INDEX_LOAD_TAG,CACHE_D)
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164 #define INDEX_LOAD_TAG_SI BUILD_CACHE_OP(INDEX_LOAD_TAG,CACHE_SI)
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165 #define INDEX_LOAD_TAG_SD BUILD_CACHE_OP(INDEX_LOAD_TAG,CACHE_SD)
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166
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167 #define INDEX_STORE_TAG_I BUILD_CACHE_OP(INDEX_STORE_TAG,CACHE_I)
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168 #define INDEX_STORE_TAG_D BUILD_CACHE_OP(INDEX_STORE_TAG,CACHE_D)
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169 #define INDEX_STORE_TAG_SI BUILD_CACHE_OP(INDEX_STORE_TAG,CACHE_SI)
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170 #define INDEX_STORE_TAG_SD BUILD_CACHE_OP(INDEX_STORE_TAG,CACHE_SD)
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171
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172 #define CREATE_DIRTY_EXCLUSIVE_D BUILD_CACHE_OP(CREATE_DIRTY_EXCLUSIVE,CACHE_D)
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173 #define CREATE_DIRTY_EXCLUSIVE_SD BUILD_CACHE_OP(CREATE_DIRTY_EXCLUSIVE,CACHE_SD)
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174
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175 #define HIT_INVALIDATE_I BUILD_CACHE_OP(HIT_INVALIDATE,CACHE_I)
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176 #define HIT_INVALIDATE_D BUILD_CACHE_OP(HIT_INVALIDATE,CACHE_D)
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177 #define HIT_INVALIDATE_SI BUILD_CACHE_OP(HIT_INVALIDATE,CACHE_SI)
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178 #define HIT_INVALIDATE_SD BUILD_CACHE_OP(HIT_INVALIDATE,CACHE_SD)
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179
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180 #define CACHE_FILL_I BUILD_CACHE_OP(CACHE_FILL,CACHE_I)
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181 #define HIT_WRITEBACK_INVALIDATE_D BUILD_CACHE_OP(HIT_WRITEBACK_INVALIDATE,CACHE_D)
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182 #define HIT_WRITEBACK_INVALIDATE_SD BUILD_CACHE_OP(HIT_WRITEBACK_INVALIDATE,CACHE_SD)
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183
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184 #define HIT_WRITEBACK_I BUILD_CACHE_OP(HIT_WRITEBACK,CACHE_I)
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185 #define HIT_WRITEBACK_D BUILD_CACHE_OP(HIT_WRITEBACK,CACHE_D)
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186 #define HIT_WRITEBACK_SD BUILD_CACHE_OP(HIT_WRITEBACK,CACHE_SD)
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187
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188 #define HIT_SET_VIRTUAL_SI BUILD_CACHE_OP(HIT_SET_VIRTUAL,CACHE_SI)
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189 #define HIT_SET_VIRTUAL_SD BUILD_CACHE_OP(HIT_SET_VIRTUAL,CACHE_SD)
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190
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191 .text
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192 .align 2
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193
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194 #ifdef LSI
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195 #define PMON_VECTOR 0xffffffffbfc00200
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196 #else
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197 #define PMON_VECTOR 0xffffffffbfc00500
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198 #endif
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199
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200 #ifndef __mips_eabi
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201 /* Provide named functions for entry into the monitor: */
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202 #define INDIRECT(name,index) \
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203 .globl name; \
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204 .ent name; \
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205 .set noreorder; \
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206 name: la $2,+(PMON_VECTOR+((index)*4)); \
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207 lw $2,0($2); \
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208 j $2; \
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209 nop; \
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210 .set reorder; \
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211 .end name
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212
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213 #else
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214 #define INDIRECT(name,index) \
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215 .globl name; \
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216 .ent name; \
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217 .set noreorder; \
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218 name: la $2,+(PMON_VECTOR+((index)*4)); \
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219 lw $2,0($2); \
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220 SUBU sp,sp,0x40; \
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221 sd ra,0x38(sp); \
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222 sd fp,0x30(sp); \
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223 jal $2; \
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224 move fp,sp; \
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225 ld ra,0x38(sp); \
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226 ld fp,0x30(sp); \
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227 j ra; \
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228 ADDU sp,sp,0x40; \
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229 .set reorder; \
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230 .end name
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231 #endif
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232
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233
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234 /* The following magic numbers are for the slots into the PMON monitor */
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235 /* The first are used as the lo-level library run-time: */
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236 INDIRECT(pmon_read,0)
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237 INDIRECT(pmon_write,1)
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238 INDIRECT(pmon_open,2)
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239 INDIRECT(pmon_close,3)
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240 /* The following are useful monitor routines: */
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241 INDIRECT(pmon_ioctl,4)
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242 INDIRECT(pmon_printf,5)
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243 INDIRECT(pmon_vsprintf,6)
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244 INDIRECT(pmon_ttctl,7)
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245 INDIRECT(pmon_cliexit,8)
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246 INDIRECT(pmon_getenv,9)
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247 INDIRECT(pmon_onintr,10)
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248 INDIRECT(pmon_flush_cache,11)
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249 INDIRECT(pmon_exception,12)
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250
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251 /* The following routine is required by the "print()" function: */
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252 .globl pmon_outbyte
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253 .ent pmon_outbyte
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254 .set noreorder
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255 pmon_outbyte:
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256 subu sp,sp,0x20 /* allocate stack space for string */
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257 sd ra,0x18(sp) /* stack return address */
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258 sd fp,0x10(sp) /* stack frame-pointer */
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259 move fp,sp /* take a copy of the stack pointer */
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260 /* We leave so much space on the stack for the string (16
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261 characters), since the call to mon_printf seems to corrupt
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262 the 8bytes at offset 8 into the string/stack. */
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263 sb a0,0x00(sp) /* character to print */
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264 sb z0,0x01(sp) /* NUL terminator */
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265 jal pmon_printf /* and output the string */
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266 move a0,sp /* take a copy of the string pointer {DELAY SLOT} */
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267
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268 move sp,fp /* recover stack pointer */
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269 ld ra,0x18(sp) /* recover return address */
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270 ld fp,0x10(sp) /* recover frame-pointer */
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271 j ra /* return to the caller */
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272 addu sp,sp,0x20 /* dump the stack space {DELAY SLOT} */
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273 .set reorder
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274 .end pmon_outbyte
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275
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276 /* EOF pmon.S */