portable/ThirdParty/XCC/Xtensa/xtensa_rtos.h - third_party/github/FreeRTOS/FreeRTOS-Kernel - Git at Google


 /*
  * Copyright (c) 2015-2019 Cadence Design Systems, Inc.
  *
  * Permission is hereby granted, free of charge, to any person obtaining
  * a copy of this software and associated documentation files (the
  * "Software"), to deal in the Software without restriction, including
  * without limitation the rights to use, copy, modify, merge, publish,
  * distribute, sublicense, and/or sell copies of the Software, and to
  * permit persons to whom the Software is furnished to do so, subject to
  * the following conditions:
  *
  * The above copyright notice and this permission notice shall be included
  * in all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
  * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */

 /*
  * RTOS-SPECIFIC INFORMATION FOR XTENSA RTOS ASSEMBLER SOURCES
  *                       (FreeRTOS Port)
  *
  * This header is the primary glue between generic Xtensa RTOS support
  * sources and a specific RTOS port for Xtensa.  It contains definitions
  * and macros for use primarily by Xtensa assembly coded source files.
  *
  * Macros in this header map callouts from generic Xtensa files to specific
  * RTOS functions. It may also be included in C source files.
  *
  * Xtensa RTOS ports support all RTOS-compatible configurations of the Xtensa
  * architecture, using the Xtensa hardware abstraction layer (HAL) to deal
  * with configuration specifics.
  *
  * Should be included by all Xtensa generic and RTOS port-specific sources.
  */

 #ifndef XTENSA_RTOS_H
 #define XTENSA_RTOS_H

 #ifdef __ASSEMBLER__
 #include    <xtensa/coreasm.h>
 #else
 #include    <xtensa/config/core.h>
 #endif

 #include    <xtensa/corebits.h>
 #include    <xtensa/config/system.h>
 #include    <xtensa/simcall.h>

 /*
 Include any RTOS specific definitions that are needed by this header.
 */
 #include    <FreeRTOSConfig.h>

 /*
 Convert FreeRTOSConfig definitions to XTENSA definitions.
 However these can still be overridden from the command line.
 */

 #ifndef XT_SIMULATOR
   #if configXT_SIMULATOR
     #define XT_SIMULATOR             1  /* Simulator mode */
   #endif
 #endif

 #ifndef XT_BOARD
   #if configXT_BOARD
     #define XT_BOARD                 1  /* Board mode */
   #endif
 #endif

 #ifndef XT_TIMER_INDEX
   #if defined configXT_TIMER_INDEX
     #define XT_TIMER_INDEX           configXT_TIMER_INDEX  /* Index of hardware timer to be used */
   #endif
 #endif

 #ifndef XT_INTEXC_HOOKS
   #if configXT_INTEXC_HOOKS
     #define XT_INTEXC_HOOKS          1  /* Enables exception hooks */
   #endif
 #endif

 #if (!XT_SIMULATOR) && (!XT_BOARD)
   #error Either XT_SIMULATOR or XT_BOARD must be defined.
 #endif


 /*
 Name of RTOS (for messages).
 */
 #define XT_RTOS_NAME    FreeRTOS

 /*
 Check some Xtensa configuration requirements and report error if not met.
 Error messages can be customize to the RTOS port.
 */

 #if !XCHAL_HAVE_XEA2
 #error "FreeRTOS/Xtensa requires XEA2 (exception architecture 2)."
 #endif


 /*******************************************************************************

 RTOS CALLOUT MACROS MAPPED TO RTOS PORT-SPECIFIC FUNCTIONS.

 Define callout macros used in generic Xtensa code to interact with the RTOS.
 The macros are simply the function names for use in calls from assembler code.
 Some of these functions may call back to generic functions in xtensa_context.h .

 *******************************************************************************/

 /*
 Inform RTOS of entry into an interrupt handler that will affect it.
 Allows RTOS to manage switch to any system stack and count nesting level.
 Called after minimal context has been saved, with interrupts disabled.
 RTOS port can call0 _xt_context_save to save the rest of the context.
 May only be called from assembly code by the 'call0' instruction.
 */
 // void XT_RTOS_INT_ENTER(void)
 #define XT_RTOS_INT_ENTER   _frxt_int_enter

 /*
 Inform RTOS of completion of an interrupt handler, and give control to
 RTOS to perform thread/task scheduling, switch back from any system stack
 and restore the context, and return to the exit dispatcher saved in the
 stack frame at XT_STK_EXIT. RTOS port can call0 _xt_context_restore
 to save the context saved in XT_RTOS_INT_ENTER via _xt_context_save,
 leaving only a minimal part of the context to be restored by the exit
 dispatcher. This function does not return to the place it was called from.
 May only be called from assembly code by the 'call0' instruction.
 */
 // void XT_RTOS_INT_EXIT(void)
 #define XT_RTOS_INT_EXIT    _frxt_int_exit

 /*
 Inform RTOS of the occurrence of a tick timer interrupt.
 If RTOS has no tick timer, leave XT_RTOS_TIMER_INT undefined.
 May be coded in or called from C or assembly, per ABI conventions.
 RTOS may optionally define XT_TICK_PER_SEC in its own way (eg. macro).
 */
 // void XT_RTOS_TIMER_INT(void)
 #define XT_RTOS_TIMER_INT   _frxt_timer_int
 #define XT_TICK_PER_SEC     configTICK_RATE_HZ

 /*
 Return in a15 the base address of the co-processor state save area for the
 thread that triggered a co-processor exception, or 0 if no thread was running.
 The state save area is structured as defined in xtensa_context.h and has size
 XT_CP_SIZE. Co-processor instructions should only be used in thread code, never
 in interrupt handlers or the RTOS kernel. May only be called from assembly code
 and by the 'call0' instruction. A result of 0 indicates an unrecoverable error.
 The implementation may use only a2-4, a15 (all other regs must be preserved).
 */
 // void* XT_RTOS_CP_STATE(void)
 #define XT_RTOS_CP_STATE    _frxt_task_coproc_state


 /*******************************************************************************

 HOOKS TO DYNAMICALLY INSTALL INTERRUPT AND EXCEPTION HANDLERS PER LEVEL.

 This Xtensa RTOS port provides hooks for dynamically installing exception
 and interrupt handlers to facilitate automated testing where each test
 case can install its own handler for user exceptions and each interrupt
 priority (level). This consists of an array of function pointers indexed
 by interrupt priority, with index 0 being the user exception handler hook.
 Each entry in the array is initially 0, and may be replaced by a function
 pointer of type XT_INTEXC_HOOK. A handler may be uninstalled by installing 0.

 The handler for low and medium priority obeys ABI conventions so may be coded
 in C. For the exception handler, the cause is the contents of the EXCCAUSE
 reg, and the result is -1 if handled, else the cause (still needs handling).
 For interrupt handlers, the cause is a mask of pending enabled interrupts at
 that level, and the result is the same mask with the bits for the handled
 interrupts cleared (those not cleared still need handling). This allows a test
 case to either pre-handle or override the default handling for the exception
 or interrupt level (see xtensa_vectors.S).

 High priority handlers (including NMI) must be coded in assembly, are always
 called by 'call0' regardless of ABI, must preserve all registers except a0,
 and must not use or modify the interrupted stack. The hook argument 'cause'
 is not passed and the result is ignored, so as not to burden the caller with
 saving and restoring a2 (it assumes only one interrupt per level - see the
 discussion in high priority interrupts in xtensa_vectors.S). The handler
 therefore should be coded to prototype 'void h(void)' even though it plugs
 into an array of handlers of prototype 'unsigned h(unsigned)'.

 To enable interrupt/exception hooks, compile the RTOS with '-DXT_INTEXC_HOOKS'.

 *******************************************************************************/

 #define XT_INTEXC_HOOK_NUM  (1 + XCHAL_NUM_INTLEVELS + XCHAL_HAVE_NMI)

 #ifndef __ASSEMBLER__
 typedef unsigned (*XT_INTEXC_HOOK)(unsigned cause);
 extern  volatile XT_INTEXC_HOOK _xt_intexc_hooks[XT_INTEXC_HOOK_NUM];
 #endif


 /*******************************************************************************

 CONVENIENCE INCLUSIONS.

 Ensures RTOS specific files need only include this one Xtensa-generic header.
 These headers are included last so they can use the RTOS definitions above.

 *******************************************************************************/

 #include    "xtensa_context.h"

 #ifdef XT_RTOS_TIMER_INT
 #include    "xtensa_timer.h"
 #endif


 /*******************************************************************************

 Xtensa Port Version.

 *******************************************************************************/

 #define XTENSA_PORT_VERSION             1.7
 #define XTENSA_PORT_VERSION_STRING      "1.7"

 #endif /* XTENSA_RTOS_H */

	/*
	* Copyright (c) 2015-2019 Cadence Design Systems, Inc.
	*
	* Permission is hereby granted, free of charge, to any person obtaining
	* a copy of this software and associated documentation files (the
	* "Software"), to deal in the Software without restriction, including
	* without limitation the rights to use, copy, modify, merge, publish,
	* distribute, sublicense, and/or sell copies of the Software, and to
	* permit persons to whom the Software is furnished to do so, subject to
	* the following conditions:
	*
	* The above copyright notice and this permission notice shall be included
	* in all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
	* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
	* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
	* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
	* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
	*/

	/*
	* RTOS-SPECIFIC INFORMATION FOR XTENSA RTOS ASSEMBLER SOURCES
	* (FreeRTOS Port)
	*
	* This header is the primary glue between generic Xtensa RTOS support
	* sources and a specific RTOS port for Xtensa. It contains definitions
	* and macros for use primarily by Xtensa assembly coded source files.
	*
	* Macros in this header map callouts from generic Xtensa files to specific
	* RTOS functions. It may also be included in C source files.
	*
	* Xtensa RTOS ports support all RTOS-compatible configurations of the Xtensa
	* architecture, using the Xtensa hardware abstraction layer (HAL) to deal
	* with configuration specifics.
	*
	* Should be included by all Xtensa generic and RTOS port-specific sources.
	*/

	#ifndef XTENSA_RTOS_H
	#define XTENSA_RTOS_H

	#ifdef __ASSEMBLER__
	#include <xtensa/coreasm.h>
	#else
	#include <xtensa/config/core.h>
	#endif

	#include <xtensa/corebits.h>
	#include <xtensa/config/system.h>
	#include <xtensa/simcall.h>

	/*
	Include any RTOS specific definitions that are needed by this header.
	*/
	#include <FreeRTOSConfig.h>

	/*
	Convert FreeRTOSConfig definitions to XTENSA definitions.
	However these can still be overridden from the command line.
	*/

	#ifndef XT_SIMULATOR
	#if configXT_SIMULATOR
	#define XT_SIMULATOR 1 /* Simulator mode */
	#endif
	#endif

	#ifndef XT_BOARD
	#if configXT_BOARD
	#define XT_BOARD 1 /* Board mode */
	#endif
	#endif

	#ifndef XT_TIMER_INDEX
	#if defined configXT_TIMER_INDEX
	#define XT_TIMER_INDEX configXT_TIMER_INDEX /* Index of hardware timer to be used */
	#endif
	#endif

	#ifndef XT_INTEXC_HOOKS
	#if configXT_INTEXC_HOOKS
	#define XT_INTEXC_HOOKS 1 /* Enables exception hooks */
	#endif
	#endif

	#if (!XT_SIMULATOR) && (!XT_BOARD)
	#error Either XT_SIMULATOR or XT_BOARD must be defined.
	#endif


	/*
	Name of RTOS (for messages).
	*/
	#define XT_RTOS_NAME FreeRTOS

	/*
	Check some Xtensa configuration requirements and report error if not met.
	Error messages can be customize to the RTOS port.
	*/

	#if !XCHAL_HAVE_XEA2
	#error "FreeRTOS/Xtensa requires XEA2 (exception architecture 2)."
	#endif


	/*******************************************************************************

	RTOS CALLOUT MACROS MAPPED TO RTOS PORT-SPECIFIC FUNCTIONS.

	Define callout macros used in generic Xtensa code to interact with the RTOS.
	The macros are simply the function names for use in calls from assembler code.
	Some of these functions may call back to generic functions in xtensa_context.h .

	*******************************************************************************/

	/*
	Inform RTOS of entry into an interrupt handler that will affect it.
	Allows RTOS to manage switch to any system stack and count nesting level.
	Called after minimal context has been saved, with interrupts disabled.
	RTOS port can call0 _xt_context_save to save the rest of the context.
	May only be called from assembly code by the 'call0' instruction.
	*/
	// void XT_RTOS_INT_ENTER(void)
	#define XT_RTOS_INT_ENTER _frxt_int_enter

	/*
	Inform RTOS of completion of an interrupt handler, and give control to
	RTOS to perform thread/task scheduling, switch back from any system stack
	and restore the context, and return to the exit dispatcher saved in the
	stack frame at XT_STK_EXIT. RTOS port can call0 _xt_context_restore
	to save the context saved in XT_RTOS_INT_ENTER via _xt_context_save,
	leaving only a minimal part of the context to be restored by the exit
	dispatcher. This function does not return to the place it was called from.
	May only be called from assembly code by the 'call0' instruction.
	*/
	// void XT_RTOS_INT_EXIT(void)
	#define XT_RTOS_INT_EXIT _frxt_int_exit

	/*
	Inform RTOS of the occurrence of a tick timer interrupt.
	If RTOS has no tick timer, leave XT_RTOS_TIMER_INT undefined.
	May be coded in or called from C or assembly, per ABI conventions.
	RTOS may optionally define XT_TICK_PER_SEC in its own way (eg. macro).
	*/
	// void XT_RTOS_TIMER_INT(void)
	#define XT_RTOS_TIMER_INT _frxt_timer_int
	#define XT_TICK_PER_SEC configTICK_RATE_HZ

	/*
	Return in a15 the base address of the co-processor state save area for the
	thread that triggered a co-processor exception, or 0 if no thread was running.
	The state save area is structured as defined in xtensa_context.h and has size
	XT_CP_SIZE. Co-processor instructions should only be used in thread code, never
	in interrupt handlers or the RTOS kernel. May only be called from assembly code
	and by the 'call0' instruction. A result of 0 indicates an unrecoverable error.
	The implementation may use only a2-4, a15 (all other regs must be preserved).
	*/
	// void* XT_RTOS_CP_STATE(void)
	#define XT_RTOS_CP_STATE _frxt_task_coproc_state


	/*******************************************************************************

	HOOKS TO DYNAMICALLY INSTALL INTERRUPT AND EXCEPTION HANDLERS PER LEVEL.

	This Xtensa RTOS port provides hooks for dynamically installing exception
	and interrupt handlers to facilitate automated testing where each test
	case can install its own handler for user exceptions and each interrupt
	priority (level). This consists of an array of function pointers indexed
	by interrupt priority, with index 0 being the user exception handler hook.
	Each entry in the array is initially 0, and may be replaced by a function
	pointer of type XT_INTEXC_HOOK. A handler may be uninstalled by installing 0.

	The handler for low and medium priority obeys ABI conventions so may be coded
	in C. For the exception handler, the cause is the contents of the EXCCAUSE
	reg, and the result is -1 if handled, else the cause (still needs handling).
	For interrupt handlers, the cause is a mask of pending enabled interrupts at
	that level, and the result is the same mask with the bits for the handled
	interrupts cleared (those not cleared still need handling). This allows a test
	case to either pre-handle or override the default handling for the exception
	or interrupt level (see xtensa_vectors.S).

	High priority handlers (including NMI) must be coded in assembly, are always
	called by 'call0' regardless of ABI, must preserve all registers except a0,
	and must not use or modify the interrupted stack. The hook argument 'cause'
	is not passed and the result is ignored, so as not to burden the caller with
	saving and restoring a2 (it assumes only one interrupt per level - see the
	discussion in high priority interrupts in xtensa_vectors.S). The handler
	therefore should be coded to prototype 'void h(void)' even though it plugs
	into an array of handlers of prototype 'unsigned h(unsigned)'.

	To enable interrupt/exception hooks, compile the RTOS with '-DXT_INTEXC_HOOKS'.

	*******************************************************************************/

	#define XT_INTEXC_HOOK_NUM (1 + XCHAL_NUM_INTLEVELS + XCHAL_HAVE_NMI)

	#ifndef __ASSEMBLER__
	typedef unsigned (*XT_INTEXC_HOOK)(unsigned cause);
	extern volatile XT_INTEXC_HOOK _xt_intexc_hooks[XT_INTEXC_HOOK_NUM];
	#endif


	/*******************************************************************************

	CONVENIENCE INCLUSIONS.

	Ensures RTOS specific files need only include this one Xtensa-generic header.
	These headers are included last so they can use the RTOS definitions above.

	*******************************************************************************/

	#include "xtensa_context.h"

	#ifdef XT_RTOS_TIMER_INT
	#include "xtensa_timer.h"
	#endif


	/*******************************************************************************

	Xtensa Port Version.

	*******************************************************************************/

	#define XTENSA_PORT_VERSION 1.7
	#define XTENSA_PORT_VERSION_STRING "1.7"

	#endif /* XTENSA_RTOS_H */