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/*
  ----------------------------------------------------------------------
  CHiPES Embedded RTR   Systems Copyright (c) Tim Oliver 2002-2004
  ----------------------------------------------------------------------
  File   :      os_cpu_c.c
  Author : Tim Oliver
  Email  : timtimoliver@yahoo.co.uk
  ---------------------------[Description]------------------------------
 
  uC/OS-II
  The Real-Time Kernel
 
  (c) Copyright 1992-2002, Jean J. Labrosse, Weston, FL
  All Rights Reserved
 
  OpenCores OpenRISC
 
  Inline NOP ORP simulator functions :
  void exit (int i) - simulator exit point
  void report(unsigned long value) - simulator report messaging
 
  Internal Routines :
  void mtspr(unsigned long spr, unsigned long vakye) -  Move To SPR
  unsigned long mfspr(unsigned long spr) -  Move From SPR
  OS_CPU_SR OSDisableInterrupts (void)
  void OSEnableInterrupts(OS_CPU_SR cpu_sr)
  void OSInitTick(void)
  void putc (char c) - standard output patch to UART
  int getc () - standard input patch to UART
  int testc () - check for character received by UART
  int ctrlc () - check for control-C received by UART
  For OS Routines see descriptions below
 
*/
 
/*
  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.
 
  This program 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.  See the
  GNU General Public License for more details.
 
  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
 
#define  OS_CPU_GLOBALS
#include "includes.h"
 
/* return value by making a syscall */
void exit (int i)
{
  asm("l.add r3,r0,%0": : "r" (i));
  asm("l.nop %0": :"K" (NOP_EXIT));
  while (1);
}
 
/* print long */
void report(unsigned long value)
{
  asm("l.addi\tr3,%0,0": :"r" (value));
  asm("l.nop %0": :"K" (NOP_REPORT));
}
 
/* For writing into SPR. */
void mtspr(unsigned long spr, unsigned long value)
{
  asm("l.mtspr\t\t%0,%1,0": : "r" (spr), "r" (value));
}
 
/* For reading SPR. */
unsigned long mfspr(unsigned long spr)
{
  unsigned long value;
  asm("l.mfspr\t\t%0,%1,0" : "=r" (value) : "r" (spr));
  return value;
}
 
#if      OS_CRITICAL_METHOD == 3
OS_CPU_SR OSDisableInterrupts (void)
{
  OS_CPU_SR cpu_sr;
 
  cpu_sr = mfspr(SPR_SR);
  mtspr(SPR_SR, cpu_sr & ~(SPR_SR_IEE | SPR_SR_TEE));
  return cpu_sr;
}
 
void OSEnableInterrupts(OS_CPU_SR cpu_sr)
{
  mtspr(SPR_SR, cpu_sr); /* | (SPR_SR_IEE | SPR_SR_TEE)*/
}
 
#endif
 
void OSInitTick(void)
{
  /* Enable tick interrupts in supervisor register */
  mtspr(SPR_SR, SPR_SR_TEE | mfspr(SPR_SR));
  /* Set tick timer to restart on match, and set interrupt enable, and set period depending on clock
     frequency and desired tick rate */
  mtspr(SPR_TTMR, SPR_TTMR_IE | SPR_TTMR_RT | ((IN_CLK/TICKS_PER_SEC) & SPR_TTMR_PERIOD));
}
 
/* stdio patches */
void putc (char c) {
  OS_CPU_SR cpu_sr;
 
  OS_ENTER_CRITICAL()
    uart_putc (c);
  OS_EXIT_CRITICAL()
}
 
int getc () {
 
  return uart_getc ();
}
 
 
int testc () {
 
  return uart_testc ();
}
 
int ctrlc ()
{
  if (testc ()) {
    switch (getc ()) {
    case 0x03:    /* ^C - Control C */
      return 1;
    default:
      break;
    }
  }
  return 0;
}
 
/*
*********************************************************************************************************
*                                       OS INITIALIZATION HOOK
*                                            (BEGINNING)
*
* Description: This function is called by OSInit() at the beginning of OSInit().
*
* Arguments  : none
*
* Note(s)    : 1) Interrupts should be disabled during this call.
*********************************************************************************************************
*/
#if OS_CPU_HOOKS_EN > 0 && OS_VERSION > 203
void  OSInitHookBegin (void)
{
 
  uart_init();
 
#ifdef __TFP_PRINTF__
  init_printf(NULL,putc);
#endif
 
  return;
 
}
#endif
 
/*
*********************************************************************************************************
*                                       OS INITIALIZATION HOOK
*                                               (END)
*
* Description: This function is called by OSInit() at the end of OSInit().
*
* Arguments  : none
*
* Note(s)    : 1) Interrupts should be disabled during this call.
*********************************************************************************************************
*/
#if OS_CPU_HOOKS_EN > 0 && OS_VERSION > 203
void  OSInitHookEnd (void)
{
}
#endif
 
/*$PAGE*/
/*
*********************************************************************************************************
*                                          TASK CREATION HOOK
*
* Description: This function is called when a task is created.
*
* Arguments  : ptcb   is a pointer to the task control block of the task being created.
*
* Note(s)    : 1) Interrupts are disabled during this call.
*********************************************************************************************************
*/
#if OS_CPU_HOOKS_EN > 0
void  OSTaskCreateHook (OS_TCB *ptcb)
{
  ptcb = ptcb;                       /* Prevent compiler warning                                     */
}
#endif
 
 
/*
*********************************************************************************************************
*                                           TASK DELETION HOOK
*
* Description: This function is called when a task is deleted.
*
* Arguments  : ptcb   is a pointer to the task control block of the task being deleted.
*
* Note(s)    : 1) Interrupts are disabled during this call.
*********************************************************************************************************
*/
#if OS_CPU_HOOKS_EN > 0
void  OSTaskDelHook (OS_TCB *ptcb)
{
  ptcb = ptcb;                       /* Prevent compiler warning                                     */
}
#endif
 
/*
*********************************************************************************************************
*                                             IDLE TASK HOOK
*
* Description: This function is called by the idle task.  This hook has been added to allow you to do
*              such things as STOP the CPU to conserve power.
*
* Arguments  : none
*
* Note(s)    : 1) Interrupts are enabled during this call.
*********************************************************************************************************
*/
#if OS_CPU_HOOKS_EN > 0 && OS_VERSION >= 251
void  OSTaskIdleHook (void)
{
  /* printf("\nEntering idle task"); */
}
#endif
 
/*
*********************************************************************************************************
*                                           STATISTIC TASK HOOK
*
* Description: This function is called every second by uC/OS-II's statistics task.  This allows your
*              application to add functionality to the statistics task.
*
* Arguments  : none
*********************************************************************************************************
*/
 
#if OS_CPU_HOOKS_EN > 0
void  OSTaskStatHook (void)
{
}
#endif
 
/*$PAGE*/
/*
*********************************************************************************************************
*                                        INITIALIZE A TASK'S STACK
*
* Description: This function is called by either OSTaskCreate() or OSTaskCreateExt() to initialize the
*              stack frame of the task being created.  This function is highly processor specific.
*
* Arguments  : task          is a pointer to the task code
*
*              pdata         is a pointer to a user supplied data area that will be passed to the task
*                            when the task first executes.
*
*              ptos          is a pointer to the top of stack.  It is assumed that 'ptos' points to
*                            a 'free' entry on the task stack.  If OS_STK_GROWTH is set to 1 then
*                            'ptos' will contain the HIGHEST valid address of the stack.  Similarly, if
*                            OS_STK_GROWTH is set to 0, the 'ptos' will contains the LOWEST valid address
*                            of the stack.
*
*              opt           specifies options that can be used to alter the behavior of OSTaskStkInit().
*                            (see uCOS_II.H for OS_TASK_OPT_???).
*
* Returns    : Always returns the location of the new top-of-stack' once the processor registers have
*              been placed on the stack in the proper order.
*
*********************************************************************************************************
*/
 
OS_STK  *OSTaskStkInit (void (*task)(void *pd), void *pdata, OS_STK *ptos, INT16U opt)
{
  OS_STK *stk;
  OS_STK *fp;
 
#ifdef DEBUG
  printf("\nCreating Stack at %x for task %x", ptos, task);
#endif
 
  opt    = opt;                           /* 'opt' is not used, prevent warning */
  stk    = ptos;                          /* Load stack pointer */
  stk--;
 
  *stk-- = (OS_STK)(pdata);               /* fp+0 -> parameter 0    */
  fp     = stk;
  *stk-- = (OS_STK)fp;                    /* sp+4 -> previous fp    */
  *stk-- = (INT32U)0;                     /* sp+0 -> return address */
 
  *stk-- = (INT32U)31;                     /* r31 = 0  */
  *stk-- = (INT32U)30;                     /* r30 = 0  */
  *stk-- = (INT32U)29;                     /* r29 = 0  */
  *stk-- = (INT32U)28;                     /* r28 = 0  */
  *stk-- = (INT32U)27;                     /* r27 = 0  */
  *stk-- = (INT32U)26;                     /* r26 = 0  */
  *stk-- = (INT32U)25;                     /* r25 = 0  */
  *stk-- = (INT32U)24;                     /* r24 = 0  */
  *stk-- = (INT32U)23;                     /* r23 = 0  */
  *stk-- = (INT32U)22;                     /* r22 = 0  */
  *stk-- = (INT32U)21;                     /* r21 = 0  */
  *stk-- = (INT32U)20;                     /* r20 = 0  */
  *stk-- = (INT32U)19;                     /* r19 = 0  */
  *stk-- = (INT32U)18;                     /* r18 = 0  */
  *stk-- = (INT32U)17;                     /* r17 = 0  */
  *stk-- = (INT32U)16;                     /* r16 = 0  */
  *stk-- = (INT32U)15;                     /* r15 = 0  */
  *stk-- = (INT32U)14;                     /* r14 = 0  */
  *stk-- = (INT32U)13;                     /* r13 = 0  */
  *stk-- = (INT32U)12;                     /* r12 = 0  */
  *stk-- = (INT32U)11;                     /* r11 = 0 return value      */
  *stk-- = (INT32U)10;                     /* r10 = 0                   */
  *stk-- = (INT32U)9;                     /* r09 = 0 link register     */
  *stk-- = (INT32U)8;                     /* r08 = 0 function paramters*/
  *stk-- = (INT32U)7;                     /* r07 = 0                   */
  *stk-- = (INT32U)6;                     /* r06 = 0                   */
  *stk-- = (INT32U)5;                     /* r05 = 0                   */
  *stk-- = (INT32U)4;                     /* r04 = 0                   */
  *stk-- = (OS_STK)(pdata);               /* r03 = arg0                */
  *stk-- = (OS_STK)fp;                    /* r02 = frame pointer       */
  *stk-- = (INT32U)(SPR_SR_IEE | SPR_SR_TEE | SPR_SR_SM);         /* status word               */
  *stk   = (OS_STK)(task);                /* program counter           */
 
  return ((OS_STK *)stk);                 /* sp gets saved in TCB      */
}
 
 
/*$PAGE*/
/*
*********************************************************************************************************
*                                           TASK SWITCH HOOK
*
* Description: This function is called when a task switch is performed.  This allows you to perform other
*              operations during a context switch.
*
* Arguments  : none
*
* Note(s)    : 1) Interrupts are disabled during this call.
*              2) It is assumed that the global pointer 'OSTCBHighRdy' points to the TCB of the task that
*                 will be 'switched in' (i.e. the highest priority task) and, 'OSTCBCur' points to the
*                 task being switched out (i.e. the preempted task).
*********************************************************************************************************
*/
#if OS_CPU_HOOKS_EN > 0
void  OSTaskSwHook (void)
{
  /* printf("\nTask Switching\n"); */
}
#endif
 
/*
*********************************************************************************************************
*                                           OSTCBInit() HOOK
*
* Description: This function is called by OS_TCBInit() after setting up most of the TCB.
*
* Arguments  : ptcb    is a pointer to the TCB of the task being created.
*
* Note(s)    : 1) Interrupts may or may not be ENABLED during this call.
*********************************************************************************************************
*/
#if OS_CPU_HOOKS_EN > 0 && OS_VERSION > 203
void  OSTCBInitHook (OS_TCB *ptcb)
{
  ptcb = ptcb;                                           /* Prevent Compiler warning                 */
}
#endif
 
 
/*
*********************************************************************************************************
*                                               TICK HOOK
*
* Description: This function is called every tick.
*
* Arguments  : none
*
* Note(s)    : 1) Interrupts may or may not be ENABLED during this call.
*********************************************************************************************************
*/
#if OS_CPU_HOOKS_EN > 0
void  OSTimeTickHook (void)
{
}
#endif
 
 
void          OSTaskReturnHook        (OS_TCB          *ptcb)
{
  /* do nothing for now */
  return;
}

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[/] [openrisc/] [trunk/] [rtos/] [ucos-ii/] [2.91/] [ucos-port/] [os_cpu_c.c] - Blame information for rev 471

Line No.	Rev	Author	Line
1	471	julius	`/*`
2			`----------------------------------------------------------------------`
3			`CHiPES Embedded RTR Systems Copyright (c) Tim Oliver 2002-2004`
4			`----------------------------------------------------------------------`
5			`File : os_cpu_c.c`
6			`Author : Tim Oliver`
7			`Email : timtimoliver@yahoo.co.uk`
8			`---------------------------[Description]------------------------------`
9
10			`uC/OS-II`
11			`The Real-Time Kernel`
12
13			`(c) Copyright 1992-2002, Jean J. Labrosse, Weston, FL`
14			`All Rights Reserved`
15
16			`OpenCores OpenRISC`
17
18			`Inline NOP ORP simulator functions :`
19			`void exit (int i) - simulator exit point`
20			`void report(unsigned long value) - simulator report messaging`
21
22			`Internal Routines :`
23			`void mtspr(unsigned long spr, unsigned long vakye) - Move To SPR`
24			`unsigned long mfspr(unsigned long spr) - Move From SPR`
25			`OS_CPU_SR OSDisableInterrupts (void)`
26			`void OSEnableInterrupts(OS_CPU_SR cpu_sr)`
27			`void OSInitTick(void)`
28			`void putc (char c) - standard output patch to UART`
29			`int getc () - standard input patch to UART`
30			`int testc () - check for character received by UART`
31			`int ctrlc () - check for control-C received by UART`
32			`For OS Routines see descriptions below`
33
34			`*/`
35
36			`/*`
37			`This program is free software; you can redistribute it and/or modify`
38			`it under the terms of the GNU General Public License as published by`
39			`the Free Software Foundation; either version 2 of the License, or`
40			`(at your option) any later version.`
41
42			`This program is distributed in the hope that it will be useful,`
43			`but WITHOUT ANY WARRANTY; without even the implied warranty of`
44			`MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the`
45			`GNU General Public License for more details.`
46
47			`You should have received a copy of the GNU General Public License`
48			`along with this program; if not, write to the Free Software`
49			`Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.`
50			`*/`
51
52			`#define OS_CPU_GLOBALS`
53			`#include "includes.h"`
54
55			`/* return value by making a syscall */`
56			`void exit (int i)`
57			`{`
58			`asm("l.add r3,r0,%0": : "r" (i));`
59			`asm("l.nop %0": :"K" (NOP_EXIT));`
60			`while (1);`
61			`}`
62
63			`/* print long */`
64			`void report(unsigned long value)`
65			`{`
66			`asm("l.addi\tr3,%0,0": :"r" (value));`
67			`asm("l.nop %0": :"K" (NOP_REPORT));`
68			`}`
69
70			`/* For writing into SPR. */`
71			`void mtspr(unsigned long spr, unsigned long value)`
72			`{`
73			`asm("l.mtspr\t\t%0,%1,0": : "r" (spr), "r" (value));`
74			`}`
75
76			`/* For reading SPR. */`
77			`unsigned long mfspr(unsigned long spr)`
78			`{`
79			`unsigned long value;`
80			`asm("l.mfspr\t\t%0,%1,0" : "=r" (value) : "r" (spr));`
81			`return value;`
82			`}`
83
84			`#if OS_CRITICAL_METHOD == 3`
85			`OS_CPU_SR OSDisableInterrupts (void)`
86			`{`
87			`OS_CPU_SR cpu_sr;`
88
89			`cpu_sr = mfspr(SPR_SR);`
90			`mtspr(SPR_SR, cpu_sr & ~(SPR_SR_IEE \| SPR_SR_TEE));`
91			`return cpu_sr;`
92			`}`
93
94			`void OSEnableInterrupts(OS_CPU_SR cpu_sr)`
95			`{`
96			`mtspr(SPR_SR, cpu_sr); /* \| (SPR_SR_IEE \| SPR_SR_TEE)*/`
97			`}`
98
99			`#endif`
100
101			`void OSInitTick(void)`
102			`{`
103			`/* Enable tick interrupts in supervisor register */`
104			`mtspr(SPR_SR, SPR_SR_TEE \| mfspr(SPR_SR));`
105			`/* Set tick timer to restart on match, and set interrupt enable, and set period depending on clock`
106			`frequency and desired tick rate */`
107			`mtspr(SPR_TTMR, SPR_TTMR_IE \| SPR_TTMR_RT \| ((IN_CLK/TICKS_PER_SEC) & SPR_TTMR_PERIOD));`
108			`}`
109
110			`/* stdio patches */`
111			`void putc (char c) {`
112			`OS_CPU_SR cpu_sr;`
113
114			`OS_ENTER_CRITICAL()`
115			`uart_putc (c);`
116			`OS_EXIT_CRITICAL()`
117			`}`
118
119			`int getc () {`
120
121			`return uart_getc ();`
122			`}`
123
124
125			`int testc () {`
126
127			`return uart_testc ();`
128			`}`
129
130			`int ctrlc ()`
131			`{`
132			`if (testc ()) {`
133			`switch (getc ()) {`
134			`case 0x03: /* ^C - Control C */`
135			`return 1;`
136			`default:`
137			`break;`
138			`}`
139			`}`
140			`return 0;`
141			`}`
142
143			`/*`
144			`*********************************************************************************************************`
145			`* OS INITIALIZATION HOOK`
146			`* (BEGINNING)`
147			`*`
148			`* Description: This function is called by OSInit() at the beginning of OSInit().`
149			`*`
150			`* Arguments : none`
151			`*`
152			`* Note(s) : 1) Interrupts should be disabled during this call.`
153			`*********************************************************************************************************`
154			`*/`
155			`#if OS_CPU_HOOKS_EN > 0 && OS_VERSION > 203`
156			`void OSInitHookBegin (void)`
157			`{`
158
159			`uart_init();`
160
161			`#ifdef __TFP_PRINTF__`
162			`init_printf(NULL,putc);`
163			`#endif`
164
165			`return;`
166
167			`}`
168			`#endif`
169
170			`/*`
171			`*********************************************************************************************************`
172			`* OS INITIALIZATION HOOK`
173			`* (END)`
174			`*`
175			`* Description: This function is called by OSInit() at the end of OSInit().`
176			`*`
177			`* Arguments : none`
178			`*`
179			`* Note(s) : 1) Interrupts should be disabled during this call.`
180			`*********************************************************************************************************`
181			`*/`
182			`#if OS_CPU_HOOKS_EN > 0 && OS_VERSION > 203`
183			`void OSInitHookEnd (void)`
184			`{`
185			`}`
186			`#endif`
187
188			`/$PAGE/`
189			`/*`
190			`*********************************************************************************************************`
191			`* TASK CREATION HOOK`
192			`*`
193			`* Description: This function is called when a task is created.`
194			`*`
195			`* Arguments : ptcb is a pointer to the task control block of the task being created.`
196			`*`
197			`* Note(s) : 1) Interrupts are disabled during this call.`
198			`*********************************************************************************************************`
199			`*/`
200			`#if OS_CPU_HOOKS_EN > 0`
201			`void OSTaskCreateHook (OS_TCB *ptcb)`
202			`{`
203			`ptcb = ptcb; /* Prevent compiler warning */`
204			`}`
205			`#endif`
206
207
208			`/*`
209			`*********************************************************************************************************`
210			`* TASK DELETION HOOK`
211			`*`
212			`* Description: This function is called when a task is deleted.`
213			`*`
214			`* Arguments : ptcb is a pointer to the task control block of the task being deleted.`
215			`*`
216			`* Note(s) : 1) Interrupts are disabled during this call.`
217			`*********************************************************************************************************`
218			`*/`
219			`#if OS_CPU_HOOKS_EN > 0`
220			`void OSTaskDelHook (OS_TCB *ptcb)`
221			`{`
222			`ptcb = ptcb; /* Prevent compiler warning */`
223			`}`
224			`#endif`
225
226			`/*`
227			`*********************************************************************************************************`
228			`* IDLE TASK HOOK`
229			`*`
230			`* Description: This function is called by the idle task. This hook has been added to allow you to do`
231			`* such things as STOP the CPU to conserve power.`
232			`*`
233			`* Arguments : none`
234			`*`
235			`* Note(s) : 1) Interrupts are enabled during this call.`
236			`*********************************************************************************************************`
237			`*/`
238			`#if OS_CPU_HOOKS_EN > 0 && OS_VERSION >= 251`
239			`void OSTaskIdleHook (void)`
240			`{`
241			`/* printf("\nEntering idle task"); */`
242			`}`
243			`#endif`
244
245			`/*`
246			`*********************************************************************************************************`
247			`* STATISTIC TASK HOOK`
248			`*`
249			`* Description: This function is called every second by uC/OS-II's statistics task. This allows your`
250			`* application to add functionality to the statistics task.`
251			`*`
252			`* Arguments : none`
253			`*********************************************************************************************************`
254			`*/`
255
256			`#if OS_CPU_HOOKS_EN > 0`
257			`void OSTaskStatHook (void)`
258			`{`
259			`}`
260			`#endif`
261
262			`/$PAGE/`
263			`/*`
264			`*********************************************************************************************************`
265			`* INITIALIZE A TASK'S STACK`
266			`*`
267			`* Description: This function is called by either OSTaskCreate() or OSTaskCreateExt() to initialize the`
268			`* stack frame of the task being created. This function is highly processor specific.`
269			`*`
270			`* Arguments : task is a pointer to the task code`
271			`*`
272			`* pdata is a pointer to a user supplied data area that will be passed to the task`
273			`* when the task first executes.`
274			`*`
275			`* ptos is a pointer to the top of stack. It is assumed that 'ptos' points to`
276			`* a 'free' entry on the task stack. If OS_STK_GROWTH is set to 1 then`
277			`* 'ptos' will contain the HIGHEST valid address of the stack. Similarly, if`
278			`* OS_STK_GROWTH is set to 0, the 'ptos' will contains the LOWEST valid address`
279			`* of the stack.`
280			`*`
281			`* opt specifies options that can be used to alter the behavior of OSTaskStkInit().`
282			`* (see uCOS_II.H for OS_TASK_OPT_???).`
283			`*`
284			`* Returns : Always returns the location of the new top-of-stack' once the processor registers have`
285			`* been placed on the stack in the proper order.`
286			`*`
287			`*********************************************************************************************************`
288			`*/`
289
290			`OS_STK OSTaskStkInit (void (task)(void pd), void pdata, OS_STK *ptos, INT16U opt)`
291			`{`
292			`OS_STK *stk;`
293			`OS_STK *fp;`
294
295			`#ifdef DEBUG`
296			`printf("\nCreating Stack at %x for task %x", ptos, task);`
297			`#endif`
298
299			`opt = opt; /* 'opt' is not used, prevent warning */`
300			`stk = ptos; /* Load stack pointer */`
301			`stk--;`
302
303			`stk-- = (OS_STK)(pdata); / fp+0 -> parameter 0 */`
304			`fp = stk;`
305			`stk-- = (OS_STK)fp; / sp+4 -> previous fp */`
306			`stk-- = (INT32U)0; / sp+0 -> return address */`
307
308			`stk-- = (INT32U)31; / r31 = 0 */`
309			`stk-- = (INT32U)30; / r30 = 0 */`
310			`stk-- = (INT32U)29; / r29 = 0 */`
311			`stk-- = (INT32U)28; / r28 = 0 */`
312			`stk-- = (INT32U)27; / r27 = 0 */`
313			`stk-- = (INT32U)26; / r26 = 0 */`
314			`stk-- = (INT32U)25; / r25 = 0 */`
315			`stk-- = (INT32U)24; / r24 = 0 */`
316			`stk-- = (INT32U)23; / r23 = 0 */`
317			`stk-- = (INT32U)22; / r22 = 0 */`
318			`stk-- = (INT32U)21; / r21 = 0 */`
319			`stk-- = (INT32U)20; / r20 = 0 */`
320			`stk-- = (INT32U)19; / r19 = 0 */`
321			`stk-- = (INT32U)18; / r18 = 0 */`
322			`stk-- = (INT32U)17; / r17 = 0 */`
323			`stk-- = (INT32U)16; / r16 = 0 */`
324			`stk-- = (INT32U)15; / r15 = 0 */`
325			`stk-- = (INT32U)14; / r14 = 0 */`
326			`stk-- = (INT32U)13; / r13 = 0 */`
327			`stk-- = (INT32U)12; / r12 = 0 */`
328			`stk-- = (INT32U)11; / r11 = 0 return value */`
329			`stk-- = (INT32U)10; / r10 = 0 */`
330			`stk-- = (INT32U)9; / r09 = 0 link register */`
331			`stk-- = (INT32U)8; / r08 = 0 function paramters*/`
332			`stk-- = (INT32U)7; / r07 = 0 */`
333			`stk-- = (INT32U)6; / r06 = 0 */`
334			`stk-- = (INT32U)5; / r05 = 0 */`
335			`stk-- = (INT32U)4; / r04 = 0 */`
336			`stk-- = (OS_STK)(pdata); / r03 = arg0 */`
337			`stk-- = (OS_STK)fp; / r02 = frame pointer */`
338			`stk-- = (INT32U)(SPR_SR_IEE \| SPR_SR_TEE \| SPR_SR_SM); / status word */`
339			`stk = (OS_STK)(task); / program counter */`
340
341			`return ((OS_STK )stk); / sp gets saved in TCB */`
342			`}`
343
344
345			`/$PAGE/`
346			`/*`
347			`*********************************************************************************************************`
348			`* TASK SWITCH HOOK`
349			`*`
350			`* Description: This function is called when a task switch is performed. This allows you to perform other`
351			`* operations during a context switch.`
352			`*`
353			`* Arguments : none`
354			`*`
355			`* Note(s) : 1) Interrupts are disabled during this call.`
356			`* 2) It is assumed that the global pointer 'OSTCBHighRdy' points to the TCB of the task that`
357			`* will be 'switched in' (i.e. the highest priority task) and, 'OSTCBCur' points to the`
358			`* task being switched out (i.e. the preempted task).`
359			`*********************************************************************************************************`
360			`*/`
361			`#if OS_CPU_HOOKS_EN > 0`
362			`void OSTaskSwHook (void)`
363			`{`
364			`/* printf("\nTask Switching\n"); */`
365			`}`
366			`#endif`
367
368			`/*`
369			`*********************************************************************************************************`
370			`* OSTCBInit() HOOK`
371			`*`
372			`* Description: This function is called by OS_TCBInit() after setting up most of the TCB.`
373			`*`
374			`* Arguments : ptcb is a pointer to the TCB of the task being created.`
375			`*`
376			`* Note(s) : 1) Interrupts may or may not be ENABLED during this call.`
377			`*********************************************************************************************************`
378			`*/`
379			`#if OS_CPU_HOOKS_EN > 0 && OS_VERSION > 203`
380			`void OSTCBInitHook (OS_TCB *ptcb)`
381			`{`
382			`ptcb = ptcb; /* Prevent Compiler warning */`
383			`}`
384			`#endif`
385
386
387			`/*`
388			`*********************************************************************************************************`
389			`* TICK HOOK`
390			`*`
391			`* Description: This function is called every tick.`
392			`*`
393			`* Arguments : none`
394			`*`
395			`* Note(s) : 1) Interrupts may or may not be ENABLED during this call.`
396			`*********************************************************************************************************`
397			`*/`
398			`#if OS_CPU_HOOKS_EN > 0`
399			`void OSTimeTickHook (void)`
400			`{`
401			`}`
402			`#endif`
403
404
405			`void OSTaskReturnHook (OS_TCB *ptcb)`
406			`{`
407			`/* do nothing for now */`
408			`return;`
409			`}`