1 | /* c4x.h |
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2 | * |
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3 | * This file is an example (i.e. "no CPU") of the file which is |
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4 | * created for each CPU family port of RTEMS. |
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5 | * |
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6 | * |
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7 | * COPYRIGHT (c) 1989-1999. |
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8 | * On-Line Applications Research Corporation (OAR). |
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9 | * |
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10 | * The license and distribution terms for this file may be |
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11 | * found in the file LICENSE in this distribution or at |
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12 | * http://www.OARcorp.com/rtems/license.html. |
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13 | * |
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14 | * $Id$ |
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15 | * |
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16 | */ |
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17 | |
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18 | #ifndef _INCLUDE_C4X_h |
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19 | #define _INCLUDE_C4X_h |
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20 | |
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21 | #ifdef __cplusplus |
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22 | extern "C" { |
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23 | #endif |
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24 | |
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25 | /* |
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26 | * This file contains the information required to build |
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27 | * RTEMS for a particular member of the "no cpu" |
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28 | * family when executing in protected mode. It does |
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29 | * this by setting variables to indicate which implementation |
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30 | * dependent features are present in a particular member |
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31 | * of the family. |
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32 | */ |
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33 | |
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34 | #if defined(_C30) |
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35 | #define CPU_MODEL_NAME "C30" |
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36 | |
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37 | #elif defined(_C31) |
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38 | #define CPU_MODEL_NAME "C31" |
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39 | |
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40 | #elif defined(_C32) |
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41 | #define CPU_MODEL_NAME "C32" |
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42 | |
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43 | #elif defined(_C33) |
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44 | #define CPU_MODEL_NAME "C33" |
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45 | |
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46 | #elif defined(_C40) |
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47 | #define CPU_MODEL_NAME "C40" |
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48 | |
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49 | #elif defined(_C44) |
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50 | #define CPU_MODEL_NAME "C44" |
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51 | |
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52 | #else |
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53 | |
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54 | #error "Unsupported CPU Model" |
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55 | |
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56 | #endif |
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57 | |
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58 | /* |
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59 | * Define the name of the CPU family. |
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60 | */ |
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61 | |
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62 | #define CPU_NAME "Texas Instruments C3x/C4x" |
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63 | |
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64 | /* |
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65 | * This port is a little unusual in that even though there are "floating |
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66 | * point registers", the notion of floating point is very inherent to |
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67 | * applications. In addition, the calling conventions require that |
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68 | * only a few extended registers be preserved across subroutine calls. |
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69 | * The overhead of including these few registers in the basic |
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70 | * context is small compared to the overhead of managing the notion |
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71 | * of separate floating point contexts. So we decided to pretend that |
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72 | * there is no FPU on the C3x or C4x. |
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73 | */ |
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74 | |
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75 | #define C4X_HAS_FPU 0 |
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76 | |
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77 | /* |
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78 | * Routines to manipulate the bits in the Status Word (ST). |
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79 | */ |
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80 | |
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81 | #define C4X_ST_C 0x0001 |
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82 | #define C4X_ST_V 0x0002 |
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83 | #define C4X_ST_Z 0x0004 |
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84 | #define C4X_ST_N 0x0008 |
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85 | #define C4X_ST_UF 0x0010 |
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86 | #define C4X_ST_LV 0x0020 |
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87 | #define C4X_ST_LUF 0x0040 |
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88 | #define C4X_ST_OVM 0x0080 |
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89 | #define C4X_ST_RM 0x0100 |
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90 | #define C4X_ST_CF 0x0400 |
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91 | #define C4X_ST_CE 0x0800 |
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92 | #define C4X_ST_CC 0x1000 |
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93 | #define C4X_ST_GIE 0x2000 |
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94 | |
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95 | #ifndef _TMS320C40 |
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96 | #define C3X_IE_INTERRUPT_MASK_BITS 0xffff |
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97 | #define C3x_IE_INTERRUPTS_ALL_ENABLED 0x0000 |
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98 | #define C3x_IE_INTERRUPTS_ALL_DISABLED 0xffff |
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99 | #endif |
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100 | |
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101 | #ifndef ASM |
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102 | |
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103 | /* |
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104 | * A nop macro. |
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105 | */ |
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106 | |
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107 | #define c4x_nop() \ |
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108 | __asm__("nop"); |
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109 | |
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110 | /* |
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111 | * Routines to set and clear individual bits in the ST (status word). |
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112 | * |
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113 | * cpu_st_bit_clear - clear bit in ST |
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114 | * cpu_st_bit_set - set bit in ST |
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115 | * cpu_st_get - obtain entire ST |
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116 | */ |
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117 | |
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118 | #ifdef _TMS320C40 |
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119 | #define c4x_gie_nop() |
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120 | #else |
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121 | #define c4x_gie_nop() { c4x_nop(); c4x_nop(); } |
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122 | #endif |
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123 | |
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124 | #define cpu_st_bit_clear(_st_bit) \ |
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125 | do { \ |
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126 | __asm__("andn %0,st" : : "g" (_st_bit) : "cc"); \ |
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127 | c4x_gie_nop(); \ |
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128 | } while (0) |
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129 | |
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130 | #define cpu_st_bit_set(_st_bit) \ |
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131 | do { \ |
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132 | __asm__("or %0,st" : : "g" (_st_bit) : "cc"); \ |
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133 | c4x_gie_nop(); \ |
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134 | } while (0) |
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135 | |
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136 | static inline unsigned int cpu_st_get(void) |
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137 | { |
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138 | register unsigned int st_value; |
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139 | __asm__("ldi st, %0" : "=r" (st_value)); |
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140 | return st_value; |
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141 | } |
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142 | |
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143 | /* |
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144 | * Routines to manipulate the Global Interrupt Enable (GIE) bit in |
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145 | * the Status Word (ST). |
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146 | * |
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147 | * c4x_global_interrupts_get - returns current GIE setting |
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148 | * c4x_global_interrupts_disable - disables global interrupts |
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149 | * c4x_global_interrupts_enable - enables global interrupts |
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150 | * c4x_global_interrupts_restore - restores GIE to pre-disable state |
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151 | * c4x_global_interrupts_flash - temporarily enable global interrupts |
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152 | */ |
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153 | |
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154 | #define c4x_global_interrupts_get() \ |
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155 | (cpu_st_get() & C4X_ST_GIE) |
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156 | |
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157 | #define c4x_global_interrupts_disable() \ |
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158 | cpu_st_bit_clear(C4X_ST_GIE) |
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159 | |
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160 | #define c4x_global_interrupts_enable() \ |
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161 | cpu_st_bit_set(C4X_ST_GIE) |
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162 | |
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163 | #define c4x_global_interrupts_restore(_old_level) \ |
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164 | cpu_st_bit_set(_old_level) |
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165 | |
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166 | #define c4x_global_interrupts_flash(_old_level) \ |
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167 | do { \ |
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168 | cpu_st_bit_set(_old_level); \ |
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169 | cpu_st_bit_clear(C4X_ST_GIE); \ |
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170 | } while (0) |
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171 | |
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172 | #ifndef _TMS320C40 |
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173 | |
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174 | /* |
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175 | * Routines to set and get the IF register |
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176 | * |
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177 | * c3x_get_if - obtains IF register |
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178 | * c3x_set_if - sets IF register |
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179 | */ |
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180 | |
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181 | static inline unsigned int c3x_get_if(void) |
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182 | { |
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183 | register unsigned int _if_value; |
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184 | |
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185 | __asm__( "ldi if, %0" : "=r" (_if_value) ); |
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186 | return _if_value; |
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187 | } |
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188 | |
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189 | static inline void c3x_set_if(unsigned int _if_value) |
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190 | { |
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191 | __asm__( "ldi %0, if" : : "g" (_if_value) : "if", "cc"); |
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192 | } |
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193 | |
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194 | /* |
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195 | * Routines to set and get the IE register |
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196 | * |
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197 | * c3x_get_ie - obtains IE register |
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198 | * c3x_set_ie - sets IE register |
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199 | */ |
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200 | |
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201 | static inline unsigned int c3x_get_ie(void) |
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202 | { |
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203 | register unsigned int _ie_value; |
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204 | |
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205 | __asm__ volatile ( "ldi ie, %0" : "=r" (_ie_value) ); |
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206 | return _ie_value; |
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207 | } |
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208 | |
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209 | static inline void c3x_set_ie(unsigned int _ie_value) |
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210 | { |
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211 | __asm__ volatile ( "ldi %0, ie" : : "g" (_ie_value) : "ie", "cc"); |
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212 | } |
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213 | |
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214 | /* |
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215 | * Routines to manipulates the mask portion of the IE register. |
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216 | * |
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217 | * c3x_ie_mask_all - returns previous IE mask |
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218 | * c3x_ie_mask_restore - restores previous IE mask |
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219 | * c3x_ie_mask_flash - temporarily restores previous IE mask |
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220 | * c3x_ie_mask_set - sets a specific set of the IE mask |
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221 | */ |
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222 | |
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223 | #define c3x_ie_mask_all( _isr_cookie ) \ |
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224 | do { \ |
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225 | __asm__("ldi ie,%0\n" \ |
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226 | "\tandn 0ffffh, ie" \ |
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227 | : "=r" (_isr_cookie): : "ie", "cc" ); \ |
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228 | } while (0) |
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229 | |
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230 | #define c3x_ie_mask_restore( _isr_cookie ) \ |
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231 | do { \ |
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232 | __asm__("or %0, ie" \ |
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233 | : : "g" (_isr_cookie) : "ie", "cc" ); \ |
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234 | } while (0) |
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235 | |
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236 | #define c3x_ie_mask_flash( _isr_cookie ) \ |
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237 | do { \ |
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238 | __asm__("or %0, ie\n" \ |
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239 | "\tandn 0ffffh, ie" \ |
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240 | : : "g" (_isr_cookie) : "ie", "cc" ); \ |
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241 | } while (0) |
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242 | |
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243 | #define c3x_ie_mask_set( _new_mask ) \ |
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244 | do { unsigned int _ie_mask; \ |
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245 | unsigned int _ie_value; \ |
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246 | \ |
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247 | if ( _new_mask == 0 ) _ie_mask = 0; \ |
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248 | else _ie_mask = 0xffff; \ |
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249 | _ie_value = c3x_get_ie(); \ |
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250 | _ie_value &= C4X_IE_INTERRUPT_MASK_BITS; \ |
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251 | _ie_value |= _ie_mask; \ |
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252 | c3x_set_ie(_ie_value); \ |
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253 | } while (0) |
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254 | #endif |
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255 | /* end of C3x specific interrupt flag routines */ |
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256 | |
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257 | /* |
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258 | * This is a section of C4x specific interrupt flag management routines. |
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259 | */ |
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260 | |
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261 | #ifdef _TMS320C40 |
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262 | |
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263 | /* |
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264 | * Routines to set and get the IIF register |
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265 | * |
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266 | * c4x_get_iif - obtains IIF register |
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267 | * c4x_set_iif - sets IIF register |
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268 | */ |
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269 | |
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270 | static inline unsigned int c4x_get_iif(void) |
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271 | { |
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272 | register unsigned int _iif_value; |
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273 | |
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274 | __asm__( "ldi iif, %0" : "=r" (_iif_value) ); |
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275 | return _iif_value; |
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276 | } |
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277 | |
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278 | static inline void c4x_set_iif(unsigned int _iif_value) |
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279 | { |
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280 | __asm__( "ldi %0, iif" : : "g" (_iif_value) : "iif", "cc"); |
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281 | } |
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282 | |
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283 | /* |
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284 | * Routines to set and get the IIE register |
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285 | * |
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286 | * c4x_get_iie - obtains IIE register |
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287 | * c4x_set_iie - sets IIE register |
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288 | */ |
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289 | |
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290 | static inline unsigned int c4x_get_iie(void) |
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291 | { |
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292 | register unsigned int _iie_value; |
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293 | |
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294 | __asm__( "ldi iie, %0" : "=r" (_iie_value) ); |
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295 | return _iie_value; |
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296 | } |
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297 | |
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298 | static inline void c4x_set_iie(unsigned int _iie_value) |
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299 | { |
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300 | __asm__( "ldi %0, iie" : : "g" (_iie_value) : "iie", "cc"); |
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301 | } |
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302 | |
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303 | /* |
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304 | * Routines to manipulates the mask portion of the IIE register. |
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305 | * |
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306 | * c4x_ie_mask_all - returns previous IIE mask |
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307 | * c4x_ie_mask_restore - restores previous IIE mask |
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308 | * c4x_ie_mask_flash - temporarily restores previous IIE mask |
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309 | * c4x_ie_mask_set - sets a specific set of the IIE mask |
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310 | */ |
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311 | |
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312 | #if 0 |
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313 | #warning "C4x IIE masking routines not implemented." |
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314 | #define c4x_iie_mask_all( _isr_cookie ) |
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315 | #define c4x_iie_mask_restore( _isr_cookie ) |
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316 | #define c4x_iie_mask_flash( _isr_cookie ) |
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317 | #define c4x_iie_mask_set( _new_mask ) |
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318 | #endif |
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319 | |
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320 | #endif |
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321 | /* end of C4x specific interrupt flag routines */ |
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322 | |
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323 | /* |
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324 | * Routines to access the Interrupt Trap Table Pointer |
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325 | * |
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326 | * c4x_get_ittp - get ITTP |
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327 | * c4x_set_ittp - set ITTP |
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328 | */ |
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329 | |
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330 | static inline void * c4x_get_ittp(void) |
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331 | { |
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332 | register unsigned int _if_value; |
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333 | |
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334 | __asm__( "ldi if, %0" : "=r" (_if_value) ); |
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335 | return (void *)((_if_value & 0xffff0000) >> 8); |
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336 | } |
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337 | |
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338 | static inline void c4x_set_ittp(void *_ittp_value) |
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339 | { |
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340 | unsigned int _if_value; |
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341 | unsigned int _ittp_field; |
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342 | |
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343 | #ifdef _TMS320C40 |
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344 | _if_value = c4x_get_iif(); |
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345 | #else |
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346 | _if_value = c3x_get_if(); |
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347 | #endif |
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348 | _if_value &= 0xffff; |
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349 | _ittp_field = (((unsigned int) _ittp_value) >> 8); |
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350 | _if_value |= _ittp_field << 16 ; |
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351 | #ifdef _TMS320C40 |
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352 | c4x_set_iif( _if_value ); |
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353 | #else |
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354 | c3x_set_if( _if_value ); |
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355 | #endif |
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356 | } |
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357 | |
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358 | #endif /* ifndef ASM */ |
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359 | |
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360 | #ifdef __cplusplus |
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361 | } |
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362 | #endif |
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363 | |
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364 | #endif /* ! _INCLUDE_C4X_h */ |
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365 | /* end of include file */ |
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