/* FreeRTOS V8.2.0rc1 - Copyright (C) 2014 Real Time Engineers Ltd. All rights reserved VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION. This file is part of the FreeRTOS distribution. FreeRTOS is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License (version 2) as published by the Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception. >>! NOTE: The modification to the GPL is included to allow you to !<< >>! distribute a combined work that includes FreeRTOS without being !<< >>! obliged to provide the source code for proprietary components !<< >>! outside of the FreeRTOS kernel. !<< FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Full license text is available on the following link: http://www.freertos.org/a00114.html 1 tab == 4 spaces! *************************************************************************** * * * Having a problem? Start by reading the FAQ "My application does * * not run, what could be wrong?". Have you defined configASSERT()? * * * * http://www.FreeRTOS.org/FAQHelp.html * * * *************************************************************************** *************************************************************************** * * * FreeRTOS provides completely free yet professionally developed, * * robust, strictly quality controlled, supported, and cross * * platform software that is more than just the market leader, it * * is the industry's de facto standard. * * * * Help yourself get started quickly while simultaneously helping * * to support the FreeRTOS project by purchasing a FreeRTOS * * tutorial book, reference manual, or both: * * http://www.FreeRTOS.org/Documentation * * * *************************************************************************** *************************************************************************** * * * Investing in training allows your team to be as productive as * * possible as early as possible, lowering your overall development * * cost, and enabling you to bring a more robust product to market * * earlier than would otherwise be possible. Richard Barry is both * * the architect and key author of FreeRTOS, and so also the world's * * leading authority on what is the world's most popular real time * * kernel for deeply embedded MCU designs. Obtaining your training * * from Richard ensures your team will gain directly from his in-depth * * product knowledge and years of usage experience. Contact Real Time * * Engineers Ltd to enquire about the FreeRTOS Masterclass, presented * * by Richard Barry: http://www.FreeRTOS.org/contact * * *************************************************************************** *************************************************************************** * * * You are receiving this top quality software for free. Please play * * fair and reciprocate by reporting any suspected issues and * * participating in the community forum: * * http://www.FreeRTOS.org/support * * * * Thank you! * * * *************************************************************************** http://www.FreeRTOS.org - Documentation, books, training, latest versions, license and Real Time Engineers Ltd. contact details. http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products, including FreeRTOS+Trace - an indispensable productivity tool, a DOS compatible FAT file system, and our tiny thread aware UDP/IP stack. http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate. Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS. http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS licenses offer ticketed support, indemnification and commercial middleware. http://www.SafeRTOS.com - High Integrity Systems also provide a safety engineered and independently SIL3 certified version for use in safety and mission critical applications that require provable dependability. 1 tab == 4 spaces! */ typedef void TCB_t; extern volatile TCB_t * volatile pxCurrentTCB; extern void vTaskSwitchContext( void ); /* * Saves the stack pointer for one task into its TCB, calls * vTaskSwitchContext() to update the TCB being used, then restores the stack * from the new TCB read to run the task. */ void portSWITCH_CONTEXT( void ); /* * Load the stack pointer from the TCB of the task which is going to be first * to execute. Then force an IRET so the registers and IP are popped off the * stack. */ void portFIRST_CONTEXT( void ); /* There are slightly different versions depending on whether you are building to include debugger information. If debugger information is used then there are a couple of extra bytes left of the ISR stack (presumably for use by the debugger). The true stack pointer is then stored in the bp register. We add 2 to the stack pointer to remove the extra bytes before we restore our context. */ #ifdef DEBUG_BUILD #pragma aux portSWITCH_CONTEXT = "mov ax, seg pxCurrentTCB" \ "mov ds, ax" \ "les bx, pxCurrentTCB" /* Save the stack pointer into the TCB. */ \ "mov es:0x2[ bx ], ss" \ "mov es:[ bx ], sp" \ "call vTaskSwitchContext" /* Perform the switch. */ \ "mov ax, seg pxCurrentTCB" /* Restore the stack pointer from the TCB. */ \ "mov ds, ax" \ "les bx, dword ptr pxCurrentTCB" \ "mov ss, es:[ bx + 2 ]" \ "mov sp, es:[ bx ]" \ "mov bp, sp" /* Prepair the bp register for the restoration of the SP in the compiler generated portion of the ISR */ \ "add bp, 0x0002" #pragma aux portFIRST_CONTEXT = "mov ax, seg pxCurrentTCB" \ "mov ds, ax" \ "les bx, dword ptr pxCurrentTCB" \ "mov ss, es:[ bx + 2 ]" \ "mov sp, es:[ bx ]" \ "add sp, 0x0002" /* Remove the extra bytes that exist in debug builds before restoring the context. */ \ "pop ax" \ "pop ax" \ "pop es" \ "pop ds" \ "popa" \ "iret" #else #pragma aux portSWITCH_CONTEXT = "mov ax, seg pxCurrentTCB" \ "mov ds, ax" \ "les bx, pxCurrentTCB" /* Save the stack pointer into the TCB. */ \ "mov es:0x2[ bx ], ss" \ "mov es:[ bx ], sp" \ "call vTaskSwitchContext" /* Perform the switch. */ \ "mov ax, seg pxCurrentTCB" /* Restore the stack pointer from the TCB. */ \ "mov ds, ax" \ "les bx, dword ptr pxCurrentTCB" \ "mov ss, es:[ bx + 2 ]" \ "mov sp, es:[ bx ]" #pragma aux portFIRST_CONTEXT = "mov ax, seg pxCurrentTCB" \ "mov ds, ax" \ "les bx, dword ptr pxCurrentTCB" \ "mov ss, es:[ bx + 2 ]" \ "mov sp, es:[ bx ]" \ "pop ax" \ "pop ax" \ "pop es" \ "pop ds" \ "popa" \ "iret" #endif