?? hic.c
字號:
/* Application */
/* */
/* CALLS */
/* */
/* TCC_Current_HISR_Pointer Retrieve current HISR pointer*/
/* TCC_Current_Task_Pointer Retrieve current task pointer*/
/* TCT_Get_Current_Protect Pickup current protection */
/* TCT_Protect Protect history structures */
/* TCT_Set_Current_Protect Set current protection */
/* TCT_Unprotect Release history protection */
/* TCT_Unprotect_Specific Release history protection */
/* TMT_Retrieve_Clock Retrieve system clock */
/* */
/* INPUTS */
/* */
/* param1 First history parameter */
/* param2 Second history parameter */
/* param3 Third history parameter */
/* */
/* OUTPUTS */
/* */
/* None */
/* */
/* HISTORY */
/* */
/* DATE REMARKS */
/* */
/* 03-01-1993 Created initial version 1.0 */
/* 04-19-1993 Verified version 1.0 */
/* 03-01-1994 Modified protection logic, */
/* resulting in version 1.1 */
/* */
/* 03-18-1994 Verified version 1.1 */
/* */
/*************************************************************************/
VOID HIC_Make_History_Entry(DATA_ELEMENT id, UNSIGNED param1,
UNSIGNED param2, UNSIGNED param3)
{
TC_PROTECT *save_protect; /* Save protect pointer */
HI_HISTORY_ENTRY *pointer; /* Quick access pointer */
NU_SUPERV_USER_VARIABLES
/* Switch to supervisor mode */
NU_SUPERVISOR_MODE();
/* If we are not in initialization, get the current protection state */
if (INC_Initialize_State == INC_END_INITIALIZE)
/* Pickup current protection. */
save_protect = TCT_Get_Current_Protect();
else
/* we are in initialization, just clear save_protect */
save_protect = 0;
/* Protect the history data structures. */
TCT_Protect(&HID_History_Protect);
/* Determine if history saving is enabled. */
if (HID_History_Enable)
{
/* Yes, history saving is enabled. */
/* Build a pointer to the next location to write to in the table. */
pointer = &HIC_History_Table[HID_Write_Index];
/* Place the necessary information into the history table at the
current location. */
pointer -> hi_id = id;
pointer -> hi_param1 = param1;
pointer -> hi_param2 = param2;
pointer -> hi_param3 = param3;
pointer -> hi_time = TMT_Retrieve_Clock();
/* Now determine what thread we are currently in. */
if ((pointer -> hi_thread =
(VOID *) TCC_Current_Task_Pointer()) != NU_NULL)
/* Task thread. Set the caller flag accordingly. */
pointer -> hi_caller = HI_TASK;
else if ((pointer -> hi_thread =
(VOID *) TCC_Current_HISR_Pointer()) != NU_NULL)
/* HISR thread. Set the caller flag accordingly. */
pointer -> hi_caller = HI_HISR;
else
/* Neither a task or HISR, it caller must be initialization. */
pointer -> hi_caller = HI_INITIALIZE;
/* Move the write index. */
HID_Write_Index++;
/* Check for a wrap condition on the write index. */
if (HID_Write_Index >= HI_MAX_ENTRIES)
/* Wrap condition present, adjust the write index to the top of the
table. */
HID_Write_Index = 0;
/* Increment the entries counter, if the maximum has not yet been
reached. */
if (HID_Entry_Count < HI_MAX_ENTRIES)
/* Increment the total entries counter. */
HID_Entry_Count++;
else
/* Drag the read index along with the write index. */
HID_Read_Index = HID_Write_Index;
}
/* Determine if there was protection in force before call. */
if (save_protect)
{
/* Make saved protection the current again. */
TCT_Set_Current_Protect(save_protect);
/* Release the history protection. */
TCT_Unprotect_Specific(&HID_History_Protect);
}
else
/* Release protection. */
TCT_Unprotect();
/* Return to user mode */
NU_USER_MODE();
}
/*************************************************************************/
/* */
/* FUNCTION */
/* */
/* HIC_Retrieve_History_Entry */
/* */
/* DESCRIPTION */
/* */
/* This function retrieves the next oldest entry in the history */
/* table. If no more entries are available, an error status is */
/* returned. */
/* */
/* CALLED BY */
/* */
/* Application */
/* */
/* CALLS */
/* */
/* TCT_Protect Protect history structures */
/* TCT_Unprotect Release history protection */
/* */
/* INPUTS */
/* */
/* id Destination for entry id */
/* param1 Destination for parameter 1 */
/* param2 Destination for parameter 2 */
/* param3 Destination for parameter 3 */
/* time Destination for time of entry*/
/* task Destination of task pointer */
/* hisr Destination of hisr pointer */
/* */
/* OUTPUTS */
/* */
/* None */
/* */
/* HISTORY */
/* */
/* DATE REMARKS */
/* */
/* 03-01-1993 Created initial version 1.0 */
/* 04-19-1993 Verified version 1.0 */
/* */
/*************************************************************************/
STATUS HIC_Retrieve_History_Entry(DATA_ELEMENT *id, UNSIGNED *param1,
UNSIGNED *param2, UNSIGNED *param3,
UNSIGNED *time, NU_TASK **task,
NU_HISR **hisr)
{
STATUS status; /* Completion status */
HI_HISTORY_ENTRY *pointer; /* Quick access pointer */
NU_SUPERV_USER_VARIABLES
/* Switch to supervisor mode */
NU_SUPERVISOR_MODE();
/* Initialize status. */
status = NU_SUCCESS;
/* Protect the history data structures. */
TCT_Protect(&HID_History_Protect);
/* Determine if there is an entry in the history log. */
if (HID_Entry_Count)
{
/* Yes, there is at least one entry in the history log. */
/* Build a pointer to the next location to read from in the table. */
pointer = &HIC_History_Table[HID_Read_Index];
/* Place the necessary information into the history table at the
current location. */
*id = pointer -> hi_id;
*param1 = pointer -> hi_param1;
*param2 = pointer -> hi_param2;
*param3 = pointer -> hi_param3;
*time = pointer -> hi_time;
/* Now determine what thread the entry was made from. */
if (pointer -> hi_caller == HI_TASK)
{
/* Setup the task return parameter. */
*task = (NU_TASK *) pointer -> hi_thread;
*hisr = NU_NULL;
}
else
{
/* In either HISR or initialize case place the thread value
in the HISR return parameter. */
*hisr = (NU_HISR *) pointer -> hi_thread;
*task = NU_NULL;
}
/* Move the read index. */
HID_Read_Index++;
/* Check for a wrap condition on the read index. */
if (HID_Read_Index >= HI_MAX_ENTRIES)
/* Wrap condition present, adjust the read index to the top of the
table. */
HID_Read_Index = 0;
/* Decrement the entries counter. */
HID_Entry_Count--;
}
else
/* Return the end of history log status. */
status = NU_END_OF_LOG;
/* Release protection. */
TCT_Unprotect();
/* Return to user mode */
NU_USER_MODE();
/* Return completion status to the caller. */
return(status);
}
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