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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 11b54a94cf58
children d2c90368aeef
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1 #ifndef CYGONCE_HAL_ARCH_H
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2 #define CYGONCE_HAL_ARCH_H
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3
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4 //=============================================================================
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5 //
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6 // hal_arch.h
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7 //
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8 // Architecture specific abstractions
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9 //
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10 //=============================================================================
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11 //####ECOSGPLCOPYRIGHTBEGIN####
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12 // -------------------------------------------
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13 // This file is part of eCos, the Embedded Configurable Operating System.
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14 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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15 //
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16 // eCos is free software; you can redistribute it and/or modify it under
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17 // the terms of the GNU General Public License as published by the Free
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18 // Software Foundation; either version 2 or (at your option) any later version.
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19 //
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20 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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21 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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22 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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23 // for more details.
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24 //
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25 // You should have received a copy of the GNU General Public License along
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26 // with eCos; if not, write to the Free Software Foundation, Inc.,
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27 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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28 //
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29 // As a special exception, if other files instantiate templates or use macros
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30 // or inline functions from this file, or you compile this file and link it
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31 // with other works to produce a work based on this file, this file does not
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32 // by itself cause the resulting work to be covered by the GNU General Public
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33 // License. However the source code for this file must still be made available
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34 // in accordance with section (3) of the GNU General Public License.
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35 //
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36 // This exception does not invalidate any other reasons why a work based on
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37 // this file might be covered by the GNU General Public License.
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38 //
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39 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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40 // at http://sources.redhat.com/ecos/ecos-license
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41 // -------------------------------------------
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42 //####ECOSGPLCOPYRIGHTEND####
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43 //=============================================================================
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44 //#####DESCRIPTIONBEGIN####
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45 //
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46 // Author(s): jskov
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47 // Contributors:jskov
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48 // Date: 1999-04-24
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49 // Purpose: Define architecture abstractions
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50 // Usage: #include <cyg/hal/hal_arch.h>
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51
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52 //
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53 //####DESCRIPTIONEND####
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54 //
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55 //=============================================================================
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56
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57 #include <pkgconf/hal.h>
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58 #include <cyg/infra/cyg_type.h>
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59 #include CYGBLD_HAL_VAR_EXCEPTION_MODEL_H
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60
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61 //-----------------------------------------------------------------------------
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62 // Exception handling function.
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63 // This function is defined by the kernel according to this prototype. It is
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64 // invoked from the HAL to deal with any CPU exceptions that the HAL does
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65 // not want to deal with itself. It usually invokes the kernel's exception
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66 // delivery mechanism.
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67
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68 externC void cyg_hal_deliver_exception( CYG_WORD code, CYG_ADDRWORD data );
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69
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70 //--------------------------------------------------------------------------
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71 // Bit manipulation routines
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72
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73 externC cyg_uint32 hal_lsbit_index(cyg_uint32 mask);
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74 externC cyg_uint32 hal_msbit_index(cyg_uint32 mask);
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76 #define HAL_LSBIT_INDEX(index, mask) index = hal_lsbit_index(mask);
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78 #define HAL_MSBIT_INDEX(index, mask) index = hal_msbit_index(mask);
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81 //-----------------------------------------------------------------------------
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82 // Context switch macros.
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83 // The arguments are pointers to locations where the stack pointer
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84 // of the current thread is to be stored, and from where the sp of the
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85 // next thread is to be fetched.
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86
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87 externC void hal_thread_switch_context( CYG_ADDRESS to, CYG_ADDRESS from );
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88 externC void hal_thread_load_context( CYG_ADDRESS to )
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89 __attribute__ ((noreturn));
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90
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91 #define HAL_THREAD_SWITCH_CONTEXT(_fspptr_,_tspptr_) \
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92 hal_thread_switch_context((CYG_ADDRESS)_tspptr_,(CYG_ADDRESS)_fspptr_);
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93
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94 #define HAL_THREAD_LOAD_CONTEXT(_tspptr_) \
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95 hal_thread_load_context( (CYG_ADDRESS)_tspptr_ );
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96
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97 //-----------------------------------------------------------------------------
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98 // Execution reorder barrier.
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99 // When optimizing the compiler can reorder code. In multithreaded systems
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100 // where the order of actions is vital, this can sometimes cause problems.
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101 // This macro may be inserted into places where reordering should not happen.
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102
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103 #define HAL_REORDER_BARRIER() asm volatile ( "" : : : "memory" )
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104
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105 //-----------------------------------------------------------------------------
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106 // Breakpoint support
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107 // HAL_BREAKPOINT() is a code sequence that will cause a breakpoint to happen
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108 // if executed.
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109 // HAL_BREAKINST is the value of the breakpoint instruction and
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110 // HAL_BREAKINST_SIZE is its size in bytes.
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111
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112 // Enable interrupts before doing the trap, or the CPU will reset.
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113 #define HAL_BREAKPOINT(_label_) \
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114 CYG_MACRO_START \
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115 HAL_ENABLE_INTERRUPTS(); \
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116 asm volatile (" .globl " #_label_ ";" #_label_ ": " \
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117 " trapa #0x20;nop;nop;nop"); \
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118 CYG_MACRO_END
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119
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120 #define HAL_BREAKINST 0xc320
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121
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122 #define HAL_BREAKINST_SIZE 2
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123
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124 //-----------------------------------------------------------------------------
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125 // HAL setjmp
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126
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127 typedef struct {
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128 cyg_uint32 sp;
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129 cyg_uint32 pr;
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130 cyg_uint32 r8;
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131 cyg_uint32 r9;
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132 cyg_uint32 r10;
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133 cyg_uint32 r11;
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134 cyg_uint32 r12;
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135 cyg_uint32 r13;
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136 cyg_uint32 r14;
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137 } hal_jmp_buf_t;
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138
130
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139 #define CYGARC_JMP_BUF_SIZE (sizeof(hal_jmp_buf_t) / sizeof(cyg_uint32))
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140
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141 typedef cyg_uint32 hal_jmp_buf[ CYGARC_JMP_BUF_SIZE ];
76
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142
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143 externC int hal_setjmp(hal_jmp_buf env);
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144 externC void hal_longjmp(hal_jmp_buf env, int val);
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145
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146 //-----------------------------------------------------------------------------
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147 // Idle thread code.
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148 // This macro is called in the idle thread loop, and gives the HAL the
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149 // chance to insert code. Typical idle thread behaviour might be to halt the
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150 // processor.
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151
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152 externC void hal_idle_thread_action(cyg_uint32 loop_count);
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153
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154 #define HAL_IDLE_THREAD_ACTION(_count_) hal_idle_thread_action(_count_)
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155
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156 //-----------------------------------------------------------------------------
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157 // Minimal and sensible stack sizes: the intention is that applications
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158 // will use these to provide a stack size in the first instance prior to
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159 // proper analysis. Idle thread stack should be this big.
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160
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161 // THESE ARE NOT INTENDED TO BE MICROMETRICALLY ACCURATE FIGURES.
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162 // THEY ARE HOWEVER ENOUGH TO START PROGRAMMING.
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163 // YOU MUST MAKE YOUR STACKS LARGER IF YOU HAVE LARGE "AUTO" VARIABLES!
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164
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165 // This is not a config option because it should not be adjusted except
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166 // under "enough rope" sort of disclaimers.
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167
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168 // Stack frame overhead per call. Space to save FP, PR and 8 registers.
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169 #define CYGNUM_HAL_STACK_FRAME_SIZE (4 * 10)
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170
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171 // Stack needed for a context switch (shreg_context_size from sh.inc)
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172 #define CYGNUM_HAL_STACK_CONTEXT_SIZE (4 * 21)
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173
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174 // Interrupt + call to ISR, interrupt_end() and the DSR
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175 #define CYGNUM_HAL_STACK_INTERRUPT_SIZE \
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176 ((24*4 /* sizeof(HAL_SavedRegisters) */) + 2 * CYGNUM_HAL_STACK_FRAME_SIZE)
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177
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178 // We define a minimum stack size as the minimum any thread could ever
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179 // legitimately get away with. We can throw asserts if users ask for less
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180 // than this. Allow enough for three interrupt sources - clock, serial and
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181 // one other
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182
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183 #ifdef CYGIMP_HAL_COMMON_INTERRUPTS_USE_INTERRUPT_STACK
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184
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185 // An interrupt stack which is large enough for all possible interrupt
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186 // conditions (and only used for that purpose) exists. "User" stacks
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187 // can therefore be much smaller
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188
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189 # define CYGNUM_HAL_STACK_SIZE_MINIMUM \
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190 (16*CYGNUM_HAL_STACK_FRAME_SIZE + 2*CYGNUM_HAL_STACK_INTERRUPT_SIZE)
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191
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192 #else
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193
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194 // No separate interrupt stack exists. Make sure all threads contain
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195 // a stack sufficiently large
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196 # define CYGNUM_HAL_STACK_SIZE_MINIMUM \
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197 (((2+3)*CYGNUM_HAL_STACK_INTERRUPT_SIZE) + \
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198 (16*CYGNUM_HAL_STACK_FRAME_SIZE))
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199 #endif
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200
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201 // Now make a reasonable choice for a typical thread size. Pluck figures
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202 // from thin air and say 30 call frames with an average of 16 words of
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203 // automatic variables per call frame
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204 #define CYGNUM_HAL_STACK_SIZE_TYPICAL \
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205 (CYGNUM_HAL_STACK_SIZE_MINIMUM + \
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206 30 * (CYGNUM_HAL_STACK_FRAME_SIZE+(16*4)))
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207
101
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208 //--------------------------------------------------------------------------
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209 // Macros for switching context between two eCos instances (jump from
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210 // code in ROM to code in RAM or vice versa).
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211 #define CYGARC_HAL_SAVE_GP()
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212 #define CYGARC_HAL_RESTORE_GP()
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213
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214 //-----------------------------------------------------------------------------
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215 #endif // CYGONCE_HAL_ARCH_H
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216 // End of hal_arch.h