2 * FreeRTOS Kernel V10.4.4
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3 * Copyright (C) 2003-2015 Cadence Design Systems, Inc.
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4 * Copyright (C) 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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6 * SPDX-License-Identifier: MIT
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8 * Permission is hereby granted, free of charge, to any person obtaining a copy of
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9 * this software and associated documentation files (the "Software"), to deal in
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10 * the Software without restriction, including without limitation the rights to
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11 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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12 * the Software, and to permit persons to whom the Software is furnished to do so,
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13 * subject to the following conditions:
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15 * The above copyright notice and this permission notice shall be included in all
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16 * copies or substantial portions of the Software.
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18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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20 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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21 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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22 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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23 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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25 * https://www.FreeRTOS.org
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26 * https://github.com/FreeRTOS
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30 /*******************************************************************************
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32 * RTOS-SPECIFIC INFORMATION FOR XTENSA RTOS ASSEMBLER SOURCES
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35 * This header is the primary glue between generic Xtensa RTOS support
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36 * sources and a specific RTOS port for Xtensa. It contains definitions
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37 * and macros for use primarily by Xtensa assembly coded source files.
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39 * Macros in this header map callouts from generic Xtensa files to specific
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40 * RTOS functions. It may also be included in C source files.
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42 * Xtensa RTOS ports support all RTOS-compatible configurations of the Xtensa
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43 * architecture, using the Xtensa hardware abstraction layer (HAL) to deal
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44 * with configuration specifics.
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46 * Should be included by all Xtensa generic and RTOS port-specific sources.
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48 *******************************************************************************/
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50 #ifndef XTENSA_RTOS_H
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51 #define XTENSA_RTOS_H
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53 #ifdef __ASSEMBLER__
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54 #include <xtensa/coreasm.h>
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56 #include <xtensa/config/core.h>
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59 #include <xtensa/corebits.h>
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60 #include <xtensa/config/system.h>
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63 * Include any RTOS specific definitions that are needed by this header.
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65 #include "FreeRTOSConfig.h"
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68 * Convert FreeRTOSConfig definitions to XTENSA definitions.
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69 * However these can still be overridden from the command line.
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72 #ifndef XT_SIMULATOR
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73 #if configXT_SIMULATOR
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74 #define XT_SIMULATOR 1 /* Simulator mode */
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80 #define XT_BOARD 1 /* Board mode */
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84 #ifndef XT_TIMER_INDEX
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85 #if defined configXT_TIMER_INDEX
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86 #define XT_TIMER_INDEX configXT_TIMER_INDEX /* Index of hardware timer to be used */
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90 #ifndef XT_INTEXC_HOOKS
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91 #if configXT_INTEXC_HOOKS
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92 #define XT_INTEXC_HOOKS 1 /* Enables exception hooks */
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96 #if !defined( XT_SIMULATOR ) && !defined( XT_BOARD )
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97 #error Either XT_SIMULATOR or XT_BOARD must be defined.
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102 * Name of RTOS (for messages).
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104 #define XT_RTOS_NAME FreeRTOS
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107 * Check some Xtensa configuration requirements and report error if not met.
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108 * Error messages can be customize to the RTOS port.
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111 #if !XCHAL_HAVE_XEA2
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112 #error "FreeRTOS/Xtensa requires XEA2 (exception architecture 2)."
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116 /*******************************************************************************
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118 * RTOS CALLOUT MACROS MAPPED TO RTOS PORT-SPECIFIC FUNCTIONS.
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120 * Define callout macros used in generic Xtensa code to interact with the RTOS.
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121 * The macros are simply the function names for use in calls from assembler code.
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122 * Some of these functions may call back to generic functions in xtensa_context.h .
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124 *******************************************************************************/
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127 * Inform RTOS of entry into an interrupt handler that will affect it.
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128 * Allows RTOS to manage switch to any system stack and count nesting level.
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129 * Called after minimal context has been saved, with interrupts disabled.
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130 * RTOS port can call0 _xt_context_save to save the rest of the context.
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131 * May only be called from assembly code by the 'call0' instruction.
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133 /* void XT_RTOS_INT_ENTER(void) */
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134 #define XT_RTOS_INT_ENTER _frxt_int_enter
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137 * Inform RTOS of completion of an interrupt handler, and give control to
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138 * RTOS to perform thread/task scheduling, switch back from any system stack
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139 * and restore the context, and return to the exit dispatcher saved in the
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140 * stack frame at XT_STK_EXIT. RTOS port can call0 _xt_context_restore
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141 * to save the context saved in XT_RTOS_INT_ENTER via _xt_context_save,
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142 * leaving only a minimal part of the context to be restored by the exit
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143 * dispatcher. This function does not return to the place it was called from.
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144 * May only be called from assembly code by the 'call0' instruction.
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146 /* void XT_RTOS_INT_EXIT(void) */
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147 #define XT_RTOS_INT_EXIT _frxt_int_exit
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150 * Inform RTOS of the occurrence of a tick timer interrupt.
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151 * If RTOS has no tick timer, leave XT_RTOS_TIMER_INT undefined.
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152 * May be coded in or called from C or assembly, per ABI conventions.
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153 * RTOS may optionally define XT_TICK_PER_SEC in its own way (eg. macro).
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155 /* void XT_RTOS_TIMER_INT(void) */
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156 #define XT_RTOS_TIMER_INT _frxt_timer_int
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157 #define XT_TICK_PER_SEC configTICK_RATE_HZ
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160 * Return in a15 the base address of the co-processor state save area for the
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161 * thread that triggered a co-processor exception, or 0 if no thread was running.
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162 * The state save area is structured as defined in xtensa_context.h and has size
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163 * XT_CP_SIZE. Co-processor instructions should only be used in thread code, never
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164 * in interrupt handlers or the RTOS kernel. May only be called from assembly code
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165 * and by the 'call0' instruction. A result of 0 indicates an unrecoverable error.
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166 * The implementation may use only a2-4, a15 (all other regs must be preserved).
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168 /* void* XT_RTOS_CP_STATE(void) */
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169 #define XT_RTOS_CP_STATE _frxt_task_coproc_state
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172 /*******************************************************************************
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174 * HOOKS TO DYNAMICALLY INSTALL INTERRUPT AND EXCEPTION HANDLERS PER LEVEL.
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176 * This Xtensa RTOS port provides hooks for dynamically installing exception
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177 * and interrupt handlers to facilitate automated testing where each test
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178 * case can install its own handler for user exceptions and each interrupt
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179 * priority (level). This consists of an array of function pointers indexed
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180 * by interrupt priority, with index 0 being the user exception handler hook.
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181 * Each entry in the array is initially 0, and may be replaced by a function
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182 * pointer of type XT_INTEXC_HOOK. A handler may be uninstalled by installing 0.
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184 * The handler for low and medium priority obeys ABI conventions so may be coded
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185 * in C. For the exception handler, the cause is the contents of the EXCCAUSE
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186 * reg, and the result is -1 if handled, else the cause (still needs handling).
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187 * For interrupt handlers, the cause is a mask of pending enabled interrupts at
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188 * that level, and the result is the same mask with the bits for the handled
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189 * interrupts cleared (those not cleared still need handling). This allows a test
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190 * case to either pre-handle or override the default handling for the exception
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191 * or interrupt level (see xtensa_vectors.S).
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193 * High priority handlers (including NMI) must be coded in assembly, are always
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194 * called by 'call0' regardless of ABI, must preserve all registers except a0,
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195 * and must not use or modify the interrupted stack. The hook argument 'cause'
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196 * is not passed and the result is ignored, so as not to burden the caller with
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197 * saving and restoring a2 (it assumes only one interrupt per level - see the
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198 * discussion in high priority interrupts in xtensa_vectors.S). The handler
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199 * therefore should be coded to prototype 'void h(void)' even though it plugs
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200 * into an array of handlers of prototype 'unsigned h(unsigned)'.
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202 * To enable interrupt/exception hooks, compile the RTOS with '-DXT_INTEXC_HOOKS'.
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204 *******************************************************************************/
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206 #define XT_INTEXC_HOOK_NUM ( 1 + XCHAL_NUM_INTLEVELS + XCHAL_HAVE_NMI )
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208 #ifndef __ASSEMBLER__
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209 typedef unsigned (* XT_INTEXC_HOOK)( unsigned cause );
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210 extern volatile XT_INTEXC_HOOK _xt_intexc_hooks[ XT_INTEXC_HOOK_NUM ];
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214 /*******************************************************************************
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216 * CONVENIENCE INCLUSIONS.
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218 * Ensures RTOS specific files need only include this one Xtensa-generic header.
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219 * These headers are included last so they can use the RTOS definitions above.
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221 *******************************************************************************/
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223 #include "xtensa_context.h"
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225 #ifdef XT_RTOS_TIMER_INT
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226 #include "xtensa_timer.h"
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230 /*******************************************************************************
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232 * Xtensa Port Version.
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234 *******************************************************************************/
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236 #define XTENSA_PORT_VERSION 1.4 .2
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237 #define XTENSA_PORT_VERSION_STRING "1.4.2"
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239 #endif /* XTENSA_RTOS_H */
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