📄 os_cpu_c.lst
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185 1 //INT16U *stk;
186 1 OS_STK *stk;
187 1
188 1 opt = opt; /* 'opt' is not used, prevent warning */
189 1 stk = (OS_STK *)ptos; /* Load stack pointer */
190 1 //装入堆栈指针ptos到stk
191 1 *--stk = ((INT16U)task) & 0x00ff; //保存任务地址底字节
192 1 *--stk = ((INT16U)task) >> 8; //保存任务地址高字节
193 1 // *--stk = 'S'; //保存堆栈指针SP
194 1 *--stk = 'A'; //入栈：ACC
195 1 *--stk = 'B'; //入栈：B
196 1 *--stk = 'H'; //入栈：DPH //暂时忽略第二指针
197 1 *--stk = 'L'; //入栈：DPL
198 1 *--stk = PSW; //入栈：PSW
199 1 *--stk = '0'; //入栈：R0
200 1 *--stk = (((INT16U)os_pdata) & 0x00ff); //偏移底位即R1
201 1 *--stk = (((INT16U)os_pdata) & 0xff00) >> 8;//偏移高位即R2
202 1 *--stk = 0x01; //空间编码
203 1 //用寄存器传递os_pdata
204 1 *--stk = '4'; //入栈：R4-R7
205 1 *--stk = '5';
206 1 *--stk = '6';
207 1 *--stk = '7';
208 1
209 1 //END
210 1 return ((OS_STK *)stk);
211 1 }
212
213 /*$PAGE*/
214
215 /*$PAGE*/
216 /*
217 *********************************************************************************************************
218 * INITIALIZE A TASK'S STACK FOR FLOATING POINT EMULATION
219 *
220 * Description: This function MUST be called BEFORE calling either OSTaskCreate() or OSTaskCreateExt() in
221 * order to initialize the task's stack to allow the task to use the Borland floating-point
222 * emulation. The returned pointer MUST be used in the task creation call.
223 *
224 * Ex.: OS_STK TaskStk[1000];
225 *
226 *
227 * void main (void)
228 * {
229 * OS_STK *ptos;
230 * OS_STK *pbos;
231 * INT32U size;
232 *
233 *
234 * OSInit();
235 * .
236 * .
237 * ptos = &TaskStk[999];
238 * pbos = &TaskStk[0];
239 * psize = 1000;
C51 COMPILER V7.20 OS_CPU_C 04/25/2005 23:03:52 PAGE 5
240 * OSTaskStkInit_FPE_x86(&ptos, &pbos, &size);
241 * OSTaskCreate(Task, (void *)0, ptos, 10);
242 * .
243 * .
244 * OSStart();
245 * }
246 *
247 * Arguments : pptos is the pointer to the task's top-of-stack pointer which would be passed to
248 * OSTaskCreate() or OSTaskCreateExt().
249 *
250 * ppbos is the pointer to the new bottom of stack pointer which would be passed to
251 * OSTaskCreateExt().
252 *
253 * psize is a pointer to the size of the stack (in number of stack elements). You
254 * MUST allocate sufficient stack space to leave at least 384 bytes for the
255 * floating-point emulation.
256 *
257 * Returns : The new size of the stack once memory is allocated to the floating-point emulation.
258 *
259 * Note(s) : 1) _SS is a Borland 'pseudo-register' and returns the contents of the Stack Segment (SS)
260 * 2) The pointer to the top-of-stack (pptos) will be modified so that it points to the new
261 * top-of-stack.
262 * 3) The pointer to the bottom-of-stack (ppbos) will be modified so that it points to the new
263 * bottom-of-stack.
264 * 4) The new size of the stack is adjusted to reflect the fact that memory was reserved on
265 * the stack for the floating-point emulation.
266 *********************************************************************************************************
267 */
268
269 /*$PAGE*/
270 //void OSTaskStkInit_FPE_x86 (OS_STK **pptos, OS_STK **ppbos, INT32U *psize)
271 //{
272 // INT32U lin_tos; /* 'Linear' version of top-of-stack address *
-/
273 // INT32U lin_bos; /* 'Linear' version of bottom-of-stack address *
-/
274 // INT16U seg;
275 // INT16U off;
276 // INT32U bytes;
277
278
279 // seg = FP_SEG(*pptos); /* Decompose top-of-stack pointer into seg:off *
-/
280 // off = FP_OFF(*pptos);
281 // lin_tos = ((INT32U)seg << 4) + (INT32U)off; /* Convert seg:off to linear address *
-/
282 // bytes = *psize * sizeof(OS_STK); /* Determine how many bytes for the stack *
-/
283 // lin_bos = (lin_tos - bytes + 15) & 0xFFFFFFF0L; /* Ensure paragraph alignment for BOS *
-/
284
285 // seg = (INT16U)(lin_bos >> 4); /* Get new 'normalized' segment *
-/
286 // *ppbos = (OS_STK *)MK_FP(seg, 0x0000); /* Create 'normalized' BOS pointer *
-/
287 // memcpy(*ppbos, MK_FP(_SS, 0), 384); /* Copy FP emulation memory to task's stack *
-/
288 // bytes = bytes - 16; /* Loose 16 bytes because of alignment *
-/
289 // *pptos = (OS_STK *)MK_FP(seg, (INT16U)bytes); /* Determine new top-of-stack *
-/
290 // *ppbos = (OS_STK *)MK_FP(seg, 384); /* Determine new bottom-of-stack *
C51 COMPILER V7.20 OS_CPU_C 04/25/2005 23:03:52 PAGE 6
-/
291 // bytes = bytes - 384;
292 // *psize = bytes / sizeof(OS_STK); /* Determine new stack size *
-/
293 //}
294
295 /*$PAGE*/
296 /*
297 *********************************************************************************************************
298 * TASK SWITCH HOOK
299 *
300 * Description: This function is called when a task switch is performed. This allows you to perform other
301 * operations during a context switch.
302 *
303 * Arguments : none
304 *
305 * Note(s) : 1) Interrupts are disabled during this call.
306 * 2) It is assumed that the global pointer 'OSTCBHighRdy' points to the TCB of the task that
307 * will be 'switched in' (i.e. the highest priority task) and, 'OSTCBCur' points to the
308 * task being switched out (i.e. the preempted task).
309 *********************************************************************************************************
310 */
311 #if OS_CPU_HOOKS_EN > 0
312 void OSTaskSwHook (void) LG_REENTRANT
313 {
314 1 }
315 #endif
316
317 /*
318 *********************************************************************************************************
319 * OSTCBInit() HOOK
320 *
321 * Description: This function is called by OS_TCBInit() after setting up most of the TCB.
322 *
323 * Arguments : ptcb is a pointer to the TCB of the task being created.
324 *
325 * Note(s) : 1) Interrupts may or may not be ENABLED during this call.
326 *********************************************************************************************************
327 */
328 #if OS_CPU_HOOKS_EN > 0 && OS_VERSION > 203
329 void OSTCBInitHook (OS_TCB *ptcb) LG_REENTRANT
330 {
331 1 ptcb = ptcb; /* Prevent Compiler warning */
332 1 }
333 #endif
334
335
336 /*
337 *********************************************************************************************************
338 * TICK HOOK
339 *
340 * Description: This function is called every tick.
341 *
342 * Arguments : none
343 *
344 * Note(s) : 1) Interrupts may or may not be ENABLED during this call.
345 *********************************************************************************************************
346 */
347 #if OS_CPU_HOOKS_EN > 0
348 void OSTimeTickHook (void) LG_REENTRANT
349 {
350 1 }
C51 COMPILER V7.20 OS_CPU_C 04/25/2005 23:03:52 PAGE 7
351 #endif
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 634 ----
CONSTANT SIZE = ---- ----
XDATA SIZE = ---- ----
PDATA SIZE = ---- ----
DATA SIZE = ---- ----
IDATA SIZE = ---- ----
BIT SIZE = ---- ----
END OF MODULE INFORMATION.
C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)
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