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1 /*\r
2     FreeRTOS V7.5.1 - Copyright (C) 2013 Real Time Engineers Ltd.\r
3 \r
4     VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.\r
5 \r
6     ***************************************************************************\r
7      *                                                                       *\r
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9      *    robust, strictly quality controlled, supported, and cross          *\r
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11      *                                                                       *\r
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16      *    Thank you!                                                         *\r
17      *                                                                       *\r
18     ***************************************************************************\r
19 \r
20     This file is part of the FreeRTOS distribution.\r
21 \r
22     FreeRTOS is free software; you can redistribute it and/or modify it under\r
23     the terms of the GNU General Public License (version 2) as published by the\r
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25 \r
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28     >>! the source code for proprietary components outside of the FreeRTOS\r
29     >>! kernel.\r
30 \r
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34     link: http://www.freertos.org/a00114.html\r
35 \r
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37 \r
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60     mission critical applications that require provable dependability.\r
61 \r
62     1 tab == 4 spaces!\r
63 */\r
64 \r
65 #ifndef PORT_ASM_H\r
66 #define PORT_ASM_H\r
67 \r
68 typedef void tskTCB;\r
69 extern volatile tskTCB * volatile pxCurrentTCB;\r
70 extern void vTaskSwitchContext( void );\r
71 \r
72 /*\r
73  * Saves the stack pointer for one task into its TCB, calls\r
74  * vTaskSwitchContext() to update the TCB being used, then restores the stack\r
75  * from the new TCB read to run the task.\r
76  */\r
77 void portEND_SWITCHING_ISR( void );\r
78 \r
79 /*\r
80  * Load the stack pointer from the TCB of the task which is going to be first\r
81  * to execute.  Then force an IRET so the registers and IP are popped off the\r
82  * stack.\r
83  */\r
84 void portFIRST_CONTEXT( void );\r
85 \r
86 #define portEND_SWITCHING_ISR()                                                                                 \\r
87                                                         asm { mov       bx, [pxCurrentTCB]                      }   \\r
88                             asm { mov   word ptr [bx], sp                       }       \\r
89                                                         asm { call  far ptr vTaskSwitchContext  }       \\r
90                                                         asm { mov       bx, [pxCurrentTCB]                      }       \\r
91                                                         asm { mov       sp, [bx]                                        }\r
92 \r
93 #define portFIRST_CONTEXT()                                                                                     \\r
94                                                         asm { mov       bx, [pxCurrentTCB]                      }       \\r
95                                                         asm { mov       sp, [bx]                                        }       \\r
96                                                         asm { pop       bp                                                      }       \\r
97                                                         asm { pop       di                                                      }       \\r
98                                                         asm { pop       si                                                      }       \\r
99                                                         asm { pop       ds                                                      }       \\r
100                                                         asm { pop       es                                                      }       \\r
101                                                         asm { pop       dx                                                      }       \\r
102                                                         asm { pop       cx                                                      }       \\r
103                                                         asm { pop       bx                                                      }       \\r
104                                                         asm { pop       ax                                                      }       \\r
105                                                         asm { iret                                                              }\r
106 \r
107 \r
108 #endif\r
109 \r