git.sur5r.net Git - freertos/blob - FreeRTOS/Source/portable/Paradigm/Tern_EE/small/portasm.h

   1 /*\r
   2  * FreeRTOS Kernel V10.0.0\r
   3  * Copyright (C) 2017 Amazon.com, Inc. or its affiliates.  All Rights Reserved.\r
   4  *\r
   5  * Permission is hereby granted, free of charge, to any person obtaining a copy of\r
   6  * this software and associated documentation files (the "Software"), to deal in\r
   7  * the Software without restriction, including without limitation the rights to\r
   8  * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of\r
   9  * the Software, and to permit persons to whom the Software is furnished to do so,\r
  10  * subject to the following conditions:\r
  11  *\r
  12  * The above copyright notice and this permission notice shall be included in all\r
  13  * copies or substantial portions of the Software. If you wish to use our Amazon\r
  14  * FreeRTOS name, please do so in a fair use way that does not cause confusion.\r
  15  *\r
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS\r
  18  * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR\r
  19  * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER\r
  20  * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN\r
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.\r
  22  *\r
  23  * http://www.FreeRTOS.org\r
  24  * http://aws.amazon.com/freertos\r
  25  *\r
  26  * 1 tab == 4 spaces!\r
  27  */\r
  28 \r
  29 #ifndef PORT_ASM_H\r
  30 #define PORT_ASM_H\r
  31 \r
  32 typedef void TCB_t;\r
  33 extern volatile TCB_t * volatile pxCurrentTCB;\r
  34 extern void vTaskSwitchContext( void );\r
  35 \r
  36 /*\r
  37  * Saves the stack pointer for one task into its TCB, calls\r
  38  * vTaskSwitchContext() to update the TCB being used, then restores the stack\r
  39  * from the new TCB read to run the task.\r
  40  */\r
  41 void portEND_SWITCHING_ISR( void );\r
  42 \r
  43 /*\r
  44  * Load the stack pointer from the TCB of the task which is going to be first\r
  45  * to execute.  Then force an IRET so the registers and IP are popped off the\r
  46  * stack.\r
  47  */\r
  48 void portFIRST_CONTEXT( void );\r
  49 \r
  50 #define portEND_SWITCHING_ISR()                                                                                 \\r
  51                                                         asm { mov       bx, [pxCurrentTCB]                      }   \\r
  52                             asm { mov   word ptr [bx], sp                       }       \\r
  53                                                         asm { call  far ptr vTaskSwitchContext  }       \\r
  54                                                         asm { mov       bx, [pxCurrentTCB]                      }       \\r
  55                                                         asm { mov       sp, [bx]                                        }\r
  56 \r
  57 #define portFIRST_CONTEXT()                                                                                     \\r
  58                                                         asm { mov       bx, [pxCurrentTCB]                      }       \\r
  59                                                         asm { mov       sp, [bx]                                        }       \\r
  60                                                         asm { pop       bp                                                      }       \\r
  61                                                         asm { pop       di                                                      }       \\r
  62                                                         asm { pop       si                                                      }       \\r
  63                                                         asm { pop       ds                                                      }       \\r
  64                                                         asm { pop       es                                                      }       \\r
  65                                                         asm { pop       dx                                                      }       \\r
  66                                                         asm { pop       cx                                                      }       \\r
  67                                                         asm { pop       bx                                                      }       \\r
  68                                                         asm { pop       ax                                                      }       \\r
  69                                                         asm { iret                                                              }\r
  70 \r
  71 \r
  72 #endif\r
  73 \r