1 /*******************************************************************************
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2 // Copyright (c) 2003-2015 Cadence Design Systems, Inc.
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4 // Permission is hereby granted, free of charge, to any person obtaining
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5 // a copy of this software and associated documentation files (the
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6 // "Software"), to deal in the Software without restriction, including
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7 // without limitation the rights to use, copy, modify, merge, publish,
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8 // distribute, sublicense, and/or sell copies of the Software, and to
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9 // permit persons to whom the Software is furnished to do so, subject to
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10 // the following conditions:
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12 // The above copyright notice and this permission notice shall be included
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13 // in all copies or substantial portions of the Software.
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15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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16 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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17 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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18 // IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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19 // CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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20 // TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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21 // SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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22 --------------------------------------------------------------------------------
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24 Configuration-specific information for Xtensa build. This file must be
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25 included in FreeRTOSConfig.h to properly set up the config-dependent
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26 parameters correctly.
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28 NOTE: To enable thread-safe C library support, XT_USE_THREAD_SAFE_CLIB must
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29 be defined to be > 0 somewhere above or on the command line.
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31 *******************************************************************************/
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33 #ifndef XTENSA_CONFIG_H
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34 #define XTENSA_CONFIG_H
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40 #include <xtensa/hal.h>
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41 #include <xtensa/config/core.h>
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42 #include <xtensa/config/system.h> /* required for XSHAL_CLIB */
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44 #include "xtensa_context.h"
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47 /*-----------------------------------------------------------------------------
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48 * STACK REQUIREMENTS
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50 * This section defines the minimum stack size, and the extra space required to
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51 * be allocated for saving coprocessor state and/or C library state information
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52 * (if thread safety is enabled for the C library). The sizes are in bytes.
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54 * Stack sizes for individual tasks should be derived from these minima based on
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55 * the maximum call depth of the task and the maximum level of interrupt nesting.
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56 * A minimum stack size is defined by XT_STACK_MIN_SIZE. This minimum is based
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57 * on the requirement for a task that calls nothing else but can be interrupted.
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58 * This assumes that interrupt handlers do not call more than a few levels deep.
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59 * If this is not true, i.e. one or more interrupt handlers make deep calls then
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60 * the minimum must be increased.
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62 * If the Xtensa processor configuration includes coprocessors, then space is
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63 * allocated to save the coprocessor state on the stack.
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65 * If thread safety is enabled for the C runtime library, (XT_USE_THREAD_SAFE_CLIB
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66 * is defined) then space is allocated to save the C library context in the TCB.
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68 * Allocating insufficient stack space is a common source of hard-to-find errors.
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69 * During development, it is best to enable the FreeRTOS stack checking features.
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73 * XT_USE_THREAD_SAFE_CLIB -- Define this to a nonzero value to enable thread-safe
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74 * use of the C library. This will require extra stack
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75 * space to be allocated for tasks that use the C library
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76 * reentrant functions. See below for more information.
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78 * NOTE: The Xtensa toolchain supports multiple C libraries and not all of them
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79 * support thread safety. Check your core configuration to see which C library
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80 * was chosen for your system.
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82 * XT_STACK_MIN_SIZE -- The minimum stack size for any task. It is recommended
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83 * that you do not use a stack smaller than this for any
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84 * task. In case you want to use stacks smaller than this
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85 * size, you must verify that the smaller size(s) will work
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86 * under all operating conditions.
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88 * XT_STACK_EXTRA -- The amount of extra stack space to allocate for a task
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89 * that does not make C library reentrant calls. Add this
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90 * to the amount of stack space required by the task itself.
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92 * XT_STACK_EXTRA_CLIB -- The amount of space to allocate for C library state.
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94 -----------------------------------------------------------------------------*/
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96 /* Extra space required for interrupt/exception hooks. */
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97 #ifdef XT_INTEXC_HOOKS
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98 #ifdef __XTENSA_CALL0_ABI__
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99 #define STK_INTEXC_EXTRA 0x200
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101 #define STK_INTEXC_EXTRA 0x180
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104 #define STK_INTEXC_EXTRA 0
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107 /* Check C library thread safety support and compute size of C library save area.
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108 For the supported libraries, we enable thread safety by default, and this can
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109 be overridden from the compiler/make command line. */
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110 #if (XSHAL_CLIB == XTHAL_CLIB_NEWLIB) || (XSHAL_CLIB == XTHAL_CLIB_XCLIB)
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111 #ifndef XT_USE_THREAD_SAFE_CLIB
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112 #define XT_USE_THREAD_SAFE_CLIB 1
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115 #define XT_USE_THREAD_SAFE_CLIB 0
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118 #if XT_USE_THREAD_SAFE_CLIB > 0u
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119 #if XSHAL_CLIB == XTHAL_CLIB_XCLIB
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120 #define XT_HAVE_THREAD_SAFE_CLIB 1
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121 #if !defined __ASSEMBLER__
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122 #include <sys/reent.h>
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123 #define XT_CLIB_CONTEXT_AREA_SIZE ((sizeof(struct _reent) + 15) + (-16))
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124 #define XT_CLIB_GLOBAL_PTR _reent_ptr
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125 #define _REENT_INIT_PTR _init_reent
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126 #define _impure_ptr _reent_ptr
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128 void _reclaim_reent(void * ptr);
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130 #elif XSHAL_CLIB == XTHAL_CLIB_NEWLIB
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131 #define XT_HAVE_THREAD_SAFE_CLIB 1
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132 #if !defined __ASSEMBLER__
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133 #include <sys/reent.h>
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134 #define XT_CLIB_CONTEXT_AREA_SIZE ((sizeof(struct _reent) + 15) + (-16))
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135 #define XT_CLIB_GLOBAL_PTR _impure_ptr
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138 #define XT_HAVE_THREAD_SAFE_CLIB 0
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139 #error The selected C runtime library is not thread safe.
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142 #define XT_CLIB_CONTEXT_AREA_SIZE 0
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145 /*------------------------------------------------------------------------------
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146 Extra size -- interrupt frame plus coprocessor save area plus hook space.
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147 NOTE: Make sure XT_INTEXC_HOOKS is undefined unless you really need the hooks.
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148 ------------------------------------------------------------------------------*/
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149 #ifdef __XTENSA_CALL0_ABI__
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150 #define XT_XTRA_SIZE (XT_STK_FRMSZ + STK_INTEXC_EXTRA + 0x10 + XT_CP_SIZE)
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152 #define XT_XTRA_SIZE (XT_STK_FRMSZ + STK_INTEXC_EXTRA + 0x20 + XT_CP_SIZE)
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155 /*------------------------------------------------------------------------------
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156 Space allocated for user code -- function calls and local variables.
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157 NOTE: This number can be adjusted to suit your needs. You must verify that the
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158 amount of space you reserve is adequate for the worst-case conditions in your
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160 NOTE: The windowed ABI requires more stack, since space has to be reserved
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161 for spilling register windows.
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162 ------------------------------------------------------------------------------*/
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163 #ifdef __XTENSA_CALL0_ABI__
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164 #define XT_USER_SIZE 0x200
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166 #define XT_USER_SIZE 0x400
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169 /* Minimum recommended stack size. */
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170 #define XT_STACK_MIN_SIZE ((XT_XTRA_SIZE + XT_USER_SIZE) / sizeof(unsigned char))
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172 /* OS overhead with and without C library thread context. */
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173 #define XT_STACK_EXTRA (XT_XTRA_SIZE)
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174 #define XT_STACK_EXTRA_CLIB (XT_XTRA_SIZE + XT_CLIB_CONTEXT_AREA_SIZE)
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181 #endif /* XTENSA_CONFIG_H */
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