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Update version numbers in preparation for new release.
[freertos] / FreeRTOS / Source / portable / BCC / 16BitDOS / common / portasm.h
1 /*\r
2     FreeRTOS V8.2.2 - Copyright (C) 2015 Real Time Engineers Ltd.\r
3     All rights reserved\r
4 \r
5     VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.\r
6 \r
7     This file is part of the FreeRTOS distribution.\r
8 \r
9     FreeRTOS is free software; you can redistribute it and/or modify it under\r
10     the terms of the GNU General Public License (version 2) as published by the\r
11     Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.\r
12 \r
13     ***************************************************************************\r
14     >>!   NOTE: The modification to the GPL is included to allow you to     !<<\r
15     >>!   distribute a combined work that includes FreeRTOS without being   !<<\r
16     >>!   obliged to provide the source code for proprietary components     !<<\r
17     >>!   outside of the FreeRTOS kernel.                                   !<<\r
18     ***************************************************************************\r
19 \r
20     FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY\r
21     WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS\r
22     FOR A PARTICULAR PURPOSE.  Full license text is available on the following\r
23     link: http://www.freertos.org/a00114.html\r
24 \r
25     ***************************************************************************\r
26      *                                                                       *\r
27      *    FreeRTOS provides completely free yet professionally developed,    *\r
28      *    robust, strictly quality controlled, supported, and cross          *\r
29      *    platform software that is more than just the market leader, it     *\r
30      *    is the industry's de facto standard.                               *\r
31      *                                                                       *\r
32      *    Help yourself get started quickly while simultaneously helping     *\r
33      *    to support the FreeRTOS project by purchasing a FreeRTOS           *\r
34      *    tutorial book, reference manual, or both:                          *\r
35      *    http://www.FreeRTOS.org/Documentation                              *\r
36      *                                                                       *\r
37     ***************************************************************************\r
38 \r
39     http://www.FreeRTOS.org/FAQHelp.html - Having a problem?  Start by reading\r
40     the FAQ page "My application does not run, what could be wrong?".  Have you\r
41     defined configASSERT()?\r
42 \r
43     http://www.FreeRTOS.org/support - In return for receiving this top quality\r
44     embedded software for free we request you assist our global community by\r
45     participating in the support forum.\r
46 \r
47     http://www.FreeRTOS.org/training - Investing in training allows your team to\r
48     be as productive as possible as early as possible.  Now you can receive\r
49     FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers\r
50     Ltd, and the world's leading authority on the world's leading RTOS.\r
51 \r
52     http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,\r
53     including FreeRTOS+Trace - an indispensable productivity tool, a DOS\r
54     compatible FAT file system, and our tiny thread aware UDP/IP stack.\r
55 \r
56     http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.\r
57     Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.\r
58 \r
59     http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High\r
60     Integrity Systems ltd. to sell under the OpenRTOS brand.  Low cost OpenRTOS\r
61     licenses offer ticketed support, indemnification and commercial middleware.\r
62 \r
63     http://www.SafeRTOS.com - High Integrity Systems also provide a safety\r
64     engineered and independently SIL3 certified version for use in safety and\r
65     mission critical applications that require provable dependability.\r
66 \r
67     1 tab == 4 spaces!\r
68 */\r
69 \r
70 #ifndef PORT_ASM_H\r
71 #define PORT_ASM_H\r
72 \r
73 typedef void TCB_t;\r
74 extern volatile TCB_t * volatile pxCurrentTCB;\r
75 extern void vTaskSwitchContext( void );\r
76 \r
77 /*\r
78  * Saves the stack pointer for one task into its TCB, calls\r
79  * vTaskSwitchContext() to update the TCB being used, then restores the stack\r
80  * from the new TCB read to run the task.\r
81  */\r
82 void portSWITCH_CONTEXT( void );\r
83 \r
84 /*\r
85  * Load the stack pointer from the TCB of the task which is going to be first\r
86  * to execute.  Then force an IRET so the registers and IP are popped off the\r
87  * stack.\r
88  */\r
89 void portFIRST_CONTEXT( void );\r
90 \r
91 /* There are slightly different versions depending on whether you are building\r
92 to include debugger information.  If debugger information is used then there\r
93 are a couple of extra bytes left of the ISR stack (presumably for use by the\r
94 debugger).  The true stack pointer is then stored in the bp register.  We add\r
95 2 to the stack pointer to remove the extra bytes before we restore our context. */\r
96 \r
97 #define portSWITCH_CONTEXT()                                                                                    \\r
98                                                         asm { mov       ax, seg pxCurrentTCB            }       \\r
99                                                         asm { mov       ds, ax                                          }       \\r
100                                                         asm { les       bx, pxCurrentTCB                        }       /* Save the stack pointer into the TCB. */              \\r
101                                                         asm { mov       es:0x2[ bx ], ss                        }       \\r
102                                                         asm { mov       es:[ bx ], sp                           }       \\r
103                                                         asm { call  far ptr vTaskSwitchContext  }       /* Perform the switch. */                                               \\r
104                                                         asm { mov       ax, seg pxCurrentTCB            }       /* Restore the stack pointer from the TCB. */   \\r
105                                                         asm { mov       ds, ax                                          }       \\r
106                                                         asm { les       bx, dword ptr pxCurrentTCB      }       \\r
107                                                         asm { mov       ss, es:[ bx + 2 ]                       }       \\r
108                                                         asm { mov       sp, es:[ bx ]                           }\r
109 \r
110 #define portFIRST_CONTEXT()                                                                                             \\r
111                                                         __asm { mov     ax, seg pxCurrentTCB            }       \\r
112                                                         __asm { mov     ds, ax                                          }       \\r
113                                                         __asm { les     bx, dword ptr pxCurrentTCB      }       \\r
114                                                         __asm { mov     ss, es:[ bx + 2 ]                       }       \\r
115                                                         __asm { mov     sp, es:[ bx ]                           }       \\r
116                                                         __asm { pop     bp                                                      }       \\r
117                                                         __asm { pop     di                                                      }       \\r
118                                                         __asm { pop     si                                                      }       \\r
119                                                         __asm { pop     ds                                                      }       \\r
120                                                         __asm { pop     es                                                      }       \\r
121                                                         __asm { pop     dx                                                      }       \\r
122                                                         __asm { pop     cx                                                      }       \\r
123                                                         __asm { pop     bx                                                      }       \\r
124                                                         __asm { pop     ax                                                      }       \\r
125                                                         __asm { iret                                                    }\r
126 \r
127 \r
128 #endif\r
129 \r