FreeCalypso > hg > fc-tourmaline
view src/nucleus/tcce.c @ 43:01a8b04242af
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| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Sat, 17 Oct 2020 10:04:54 +0000 |
| parents | 4e78acac3d88 |
| children |
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/*************************************************************************/ /* */ /* Copyright Mentor Graphics Corporation 2002 */ /* All Rights Reserved. */ /* */ /* THIS WORK CONTAINS TRADE SECRET AND PROPRIETARY INFORMATION WHICH IS */ /* THE PROPERTY OF MENTOR GRAPHICS CORPORATION OR ITS LICENSORS AND IS */ /* SUBJECT TO LICENSE TERMS. */ /* */ /*************************************************************************/ /*************************************************************************/ /* */ /* FILE NAME VERSION */ /* */ /* tcce.c Nucleus PLUS 1.14 */ /* */ /* COMPONENT */ /* */ /* TC - Thread Control */ /* */ /* DESCRIPTION */ /* */ /* This file contains error checking routines for the functions in */ /* the Thread Control component. This permits easy removal of */ /* error checking logic when it is not needed. */ /* */ /* DATA STRUCTURES */ /* */ /* None */ /* */ /* FUNCTIONS */ /* */ /* TCCE_Create_Task Create a task */ /* TCCE_Create_HISR Create HISR */ /* TCCE_Delete_HISR Delete HISR */ /* TCCE_Delete_Task Delete a task */ /* TCCE_Reset_Task Reset a task */ /* TCCE_Terminate_Task Terminate a task */ /* TCCE_Resume_Service Resume a task service call */ /* TCCE_Suspend_Service Suspend a task service call */ /* TCCE_Relinquish Relinquish task execution */ /* TCCE_Task_Sleep Task sleep request */ /* TCCE_Suspend_Error Check for suspend req error */ /* TCCE_Activate_HISR Activate an HISR */ /* TCCE_Validate_Resume Validates resume requests */ /* */ /* DEPENDENCIES */ /* */ /* tc_extr.h Thread Control functions */ /* */ /* HISTORY */ /* */ /* DATE REMARKS */ /* */ /* 03-01-1993 Created initial version 1.0 */ /* 04-19-1993 Verified version 1.0 */ /* 03-01-1994 Modified logic that checked task */ /* status without protection of */ /* scheduling structures, */ /* resulting in version 1.0a */ /* 03-01-1994 Verified version 1.0a */ /* 03-01-1994 Moved non-core error checking */ /* functions to a supplemental */ /* file, and modified function */ /* interfaces, added validate */ /* resume service, resulting in */ /* version 1.1 */ /* */ /* 03-18-1994 Verified version 1.1 */ /* 03-19-1996 Added error checking to */ /* TCCE_Task_Sleep, resulting */ /* in version 1.1+ (spr037) */ /* 04-17-1996 updated to version 1.2 */ /* 10-16-1996 Modified to save the current */ /* thread's protection rather */ /* than that of the task being */ /* resumed (SPR212)(SPR268) */ /* 03-24-1998 Released version 1.3. */ /* 04-17-2002 Released version 1.13m */ /* 11-07-2002 Released version 1.14 */ /*************************************************************************/ #define NU_SOURCE_FILE #include "tc_extr.h" /* Thread control functions */ /* Define external inner-component global data references. */ extern TC_TCB *TCD_Execute_Task; extern VOID *TCD_Current_Thread; /*************************************************************************/ /* */ /* FUNCTION */ /* */ /* TCCE_Create_Task */ /* */ /* DESCRIPTION */ /* */ /* This function performs error checking on the parameters supplied */ /* to the create task function. */ /* */ /* CALLED BY */ /* */ /* Application */ /* */ /* CALLS */ /* */ /* TCC_Create_Task Actual create task function */ /* */ /* INPUTS */ /* */ /* task_ptr Task control block pointer */ /* name Task name */ /* task_entry Entry function of the task */ /* argc Optional task parameter */ /* argv Optional task parameter */ /* stack_address Pointer to start of stack */ /* stack_size Size of task stack in bytes */ /* priority Task priority */ /* time_slice Task time slice */ /* preempt Task preemptability flag */ /* auto_start Automatic task start */ /* */ /* OUTPUTS */ /* */ /* NU_SUCCESS Successful request */ /* NU_INVALID_TASK Task control block pointer */ /* is NULL */ /* NU_INVALID_ENTRY Task entry function is NULL */ /* NU_INVALID_MEMORY Stack pointer is NULL */ /* NU_INVALID_SIZE Stack size is too small */ /* NU_INVALID_PRIORITY Invalid task priority */ /* NU_INVALID_PREEMPT Invalid preemption selection */ /* NU_INVALID_START Invalid start selection */ /* */ /* HISTORY */ /* */ /* DATE REMARKS */ /* */ /* 03-01-1993 Created initial version 1.0 */ /* 04-19-1993 Verified version 1.0 */ /* 03-01-1994 Modified function interface, */ /* added register optimizations, */ /* resulting in version 1.1 */ /* */ /* 03-18-1994 Verified version 1.1 */ /* */ /*************************************************************************/ STATUS TCCE_Create_Task(NU_TASK *task_ptr, CHAR *name, VOID (*task_entry)(UNSIGNED, VOID *), UNSIGNED argc, VOID *argv, VOID *stack_address, UNSIGNED stack_size, OPTION priority, UNSIGNED time_slice, OPTION preempt, OPTION auto_start) { TC_TCB *task; /* Task control block ptr */ STATUS status; /* Completion status */ /* Move input task control block pointer into internal pointer. */ task = (TC_TCB *) task_ptr; /* Check each parameter. */ if ((task == NU_NULL) || (task -> tc_id == TC_TASK_ID)) /* Invalid task control block pointer. */ status = NU_INVALID_TASK; else if (task_entry == NU_NULL) /* Invalid task entry function pointer. */ status = NU_INVALID_ENTRY; else if (stack_address == NU_NULL) /* Invalid stack starting address. */ status = NU_INVALID_MEMORY; else if (stack_size < NU_MIN_STACK_SIZE) /* Invalid stack size. */ status = NU_INVALID_SIZE; else if ((preempt != NU_PREEMPT) && (preempt != NU_NO_PREEMPT)) /* Invalid preemption. */ status = NU_INVALID_PREEMPT; else if ((auto_start != NU_START) && (auto_start != NU_NO_START)) /* Invalid start selection. */ status = NU_INVALID_START; else /* Call the actual function to create a task. All the parameters appear to be correct. */ status = TCC_Create_Task(task_ptr, name, task_entry, argc, argv, stack_address, stack_size, priority, time_slice, preempt, auto_start); /* Return completion status. */ return(status); } /*************************************************************************/ /* */ /* FUNCTION */ /* */ /* TCCE_Create_HISR */ /* */ /* DESCRIPTION */ /* */ /* This function performs error checking on the parameters supplied */ /* to the create HISR function. */ /* */ /* CALLED BY */ /* */ /* Application */ /* */ /* CALLS */ /* */ /* TCC_Create_HISR Actual create HISR function */ /* */ /* INPUTS */ /* */ /* hisr_ptr HISR control block pointer */ /* name HISR name */ /* hisr_entry Entry function of the HISR */ /* priority Task priority */ /* stack_address Pointer to start of stack */ /* stack_size Size of HISR stack in bytes */ /* */ /* OUTPUTS */ /* */ /* NU_INVALID_HISR Invalid HISR pointer */ /* NU_INVALID_ENTRY Invalid HISR entry point */ /* NU_INVALID_PRIORITY Invalid HISR priority */ /* NU_INVALID_MEMORY Indicates stack pointer NULL */ /* NU_INVALID_SIZE Indicates stack size is too */ /* small */ /* */ /* HISTORY */ /* */ /* DATE REMARKS */ /* */ /* 03-01-1993 Created initial version 1.0 */ /* 04-19-1993 Verified version 1.0 */ /* 03-01-1994 Modified function interface, */ /* added register optimizations, */ /* resulting in version 1.1 */ /* */ /* 03-18-1994 Verified version 1.1 */ /* */ /*************************************************************************/ STATUS TCCE_Create_HISR(NU_HISR *hisr_ptr, CHAR *name, VOID (*hisr_entry)(VOID), OPTION priority, VOID *stack_address, UNSIGNED stack_size) { TC_HCB *hisr; /* HISR control block ptr */ STATUS status; /* Completion status */ /* Move input HISR pointer into internal pointer. */ hisr = (TC_HCB *) hisr_ptr; /* Check each parameter. */ if ((hisr == NU_NULL) || (hisr -> tc_id == TC_HISR_ID)) /* Invalid HISR control block pointer. */ status = NU_INVALID_HISR; else if (hisr_entry == NU_NULL) /* Invalid HISR entry function pointer. */ status = NU_INVALID_ENTRY; else if (stack_address == NU_NULL) /* Invalid stack starting address. */ status = NU_INVALID_MEMORY; else if (stack_size < NU_MIN_STACK_SIZE) /* Invalid stack size. */ status = NU_INVALID_SIZE; else if (((INT) priority) >= TC_HISR_PRIORITIES) /* Invalid HISR priority. */ status = NU_INVALID_PRIORITY; else /* Call the actual function to create a HISR. All the parameters appear to be correct. */ status = TCC_Create_HISR(hisr_ptr, name, hisr_entry, priority, stack_address, stack_size); /* Return completion status. */ return(status); } /*************************************************************************/ /* */ /* FUNCTION */ /* */ /* TCCE_Delete_Task */ /* */ /* DESCRIPTION */ /* */ /* This function performs error checking on the parameters supplied */ /* to the delete task function. */ /* */ /* CALLED BY */ /* */ /* Application */ /* */ /* CALLS */ /* */ /* TCC_Delete_Task Actual delete task function */ /* */ /* INPUTS */ /* */ /* task_ptr Task control block pointer */ /* */ /* OUTPUTS */ /* */ /* NU_SUCCESS If successful completion */ /* NU_INVALID_TASK Task pointer is invalid */ /* NU_INVALID_DELETE Task not in a finished or */ /* terminated state */ /* */ /* HISTORY */ /* */ /* DATE REMARKS */ /* */ /* 03-01-1993 Created initial version 1.0 */ /* 04-19-1993 Verified version 1.0 */ /* 03-01-1994 Modified function interface, */ /* added register optimizations, */ /* resulting in version 1.1 */ /* */ /* 03-18-1994 Verified version 1.1 */ /* */ /*************************************************************************/ STATUS TCCE_Delete_Task(NU_TASK *task_ptr) { TC_TCB *task; /* Task control block ptr */ STATUS status; /* Completion status */ /* Move input task control block pointer into internal pointer. */ task = (TC_TCB *) task_ptr; /* Determine if the supplied task pointer is valid. */ if ((task == NU_NULL) || (task -> tc_id != TC_TASK_ID)) /* Invalid task pointer supplied. */ status = NU_INVALID_TASK; else if ((task -> tc_status != NU_FINISHED) && (task -> tc_status != NU_TERMINATED)) /* A task that is not in the finished or terminated state cannot be deleted. */ status = NU_INVALID_DELETE; else /* Valid task pointer, call the function to delete the task. */ status = TCC_Delete_Task(task_ptr); /* Return the completion status. */ return(status); } /*************************************************************************/ /* */ /* FUNCTION */ /* */ /* TCCE_Delete_HISR */ /* */ /* DESCRIPTION */ /* */ /* This function performs error checking on the parameters supplied */ /* to the delete HISR function. */ /* */ /* CALLED BY */ /* */ /* Application */ /* */ /* CALLS */ /* */ /* TCC_Delete_HISR Actual delete HISR function */ /* */ /* INPUTS */ /* */ /* hisr_ptr HISR control block pointer */ /* */ /* OUTPUTS */ /* */ /* NU_INVALID_HISR Indicates HISR pointer is */ /* invalid */ /* */ /* HISTORY */ /* */ /* DATE REMARKS */ /* */ /* 03-01-1993 Created initial version 1.0 */ /* 04-19-1993 Verified version 1.0 */ /* 03-01-1994 Modified function interface, */ /* added register optimizations, */ /* resulting in version 1.1 */ /* */ /* 03-18-1994 Verified version 1.1 */ /* */ /*************************************************************************/ STATUS TCCE_Delete_HISR(NU_HISR *hisr_ptr) { TC_HCB *hisr; /* HISR control block ptr */ STATUS status; /* Completion status */ /* Move input HISR control block pointer into internal pointer. */ hisr = (TC_HCB *) hisr_ptr; /* Determine if the supplied HISR pointer is valid. */ if ((hisr) && (hisr -> tc_id == TC_HISR_ID)) /* Valid HISR pointer, call the function to delete the HISR. */ status = TCC_Delete_HISR(hisr_ptr); else /* Invalid HISR pointer, indicate with the status. */ status = NU_INVALID_HISR; /* Return the completion status. */ return(status); } /*************************************************************************/ /* */ /* FUNCTION */ /* */ /* TCCE_Reset_Task */ /* */ /* DESCRIPTION */ /* */ /* This function performs error checking on the parameters supplied */ /* to the reset task function. */ /* */ /* CALLED BY */ /* */ /* Application */ /* */ /* CALLS */ /* */ /* TCC_Reset_Task Actual reset task function */ /* */ /* INPUTS */ /* */ /* task_ptr Task control block pointer */ /* argc Optional task parameter */ /* argv Optional task parameter */ /* */ /* OUTPUTS */ /* */ /* NU_INVALID_TASK Indicates task pointer is */ /* invalid */ /* */ /* HISTORY */ /* */ /* DATE REMARKS */ /* */ /* 03-01-1993 Created initial version 1.0 */ /* 04-19-1993 Verified version 1.0 */ /* 03-01-1994 Modified function interface, */ /* added register optimizations, */ /* resulting in version 1.1 */ /* */ /* 03-18-1994 Verified version 1.1 */ /* */ /*************************************************************************/ STATUS TCCE_Reset_Task(NU_TASK *task_ptr, UNSIGNED argc, VOID *argv) { TC_TCB *task; /* Task control block ptr */ STATUS status; /* Status of the request */ /* Move input task control block pointer into internal pointer. */ task = (TC_TCB *) task_ptr; /* Determine if the task pointer is valid. */ if ((task == NU_NULL) || (task -> tc_id != TC_TASK_ID)) /* Task pointer is invalid. */ status = NU_INVALID_TASK; else /* Call actual function to reset the task. */ status = TCC_Reset_Task(task_ptr, argc, argv); /* Return completion status. */ return(status); } /*************************************************************************/ /* */ /* FUNCTION */ /* */ /* TCCE_Terminate_Task */ /* */ /* DESCRIPTION */ /* */ /* This function performs error checking on the parameters supplied */ /* to the terminate task function. */ /* */ /* CALLED BY */ /* */ /* Application */ /* */ /* CALLS */ /* */ /* TCC_Terminate_Task Actual terminate task funct */ /* */ /* INPUTS */ /* */ /* task_ptr Task control block pointer */ /* */ /* OUTPUTS */ /* */ /* NU_INVALID_TASK Indicates task pointer is */ /* invalid */ /* */ /* HISTORY */ /* */ /* DATE REMARKS */ /* */ /* 03-01-1993 Created initial version 1.0 */ /* 04-19-1993 Verified version 1.0 */ /* 03-01-1994 Modified function interface, */ /* added register optimizations, */ /* resulting in version 1.1 */ /* */ /* 03-18-1994 Verified version 1.1 */ /* */ /*************************************************************************/ STATUS TCCE_Terminate_Task(NU_TASK *task_ptr) { TC_TCB *task; /* Task control block ptr */ STATUS status; /* Status return */ /* Move input task control block pointer into internal pointer. */ task = (TC_TCB *) task_ptr; /* Determine if the task pointer is valid. */ if ((task == NU_NULL) || (task -> tc_id != TC_TASK_ID)) /* Task pointer is invalid. */ status = NU_INVALID_TASK; else /* Call actual function to terminate the task. */ status = TCC_Terminate_Task(task_ptr); /* Return completion status. */ return(status); } /*************************************************************************/ /* */ /* FUNCTION */ /* */ /* TCCE_Resume_Service */ /* */ /* DESCRIPTION */ /* */ /* This function performs error checking on the parameters supplied */ /* to the resume task function. */ /* */ /* CALLED BY */ /* */ /* Application */ /* */ /* CALLS */ /* */ /* TCCE_Validate_Resume Function that checks the */ /* current task status for a */ /* valid resume request */ /* TCC_Resume_Service Actual task resume service */ /* */ /* INPUTS */ /* */ /* task_ptr Task control block pointer */ /* */ /* OUTPUTS */ /* */ /* NU_SUCCESS If successful completion */ /* NU_INVALID_TASK Task pointer is invalid */ /* NU_INVALID_RESUME Not previously suspended */ /* */ /* HISTORY */ /* */ /* DATE REMARKS */ /* */ /* 03-01-1993 Created initial version 1.0 */ /* 04-19-1993 Verified version 1.0 */ /* 03-01-1994 Modified logic that checked task */ /* status without protection of */ /* scheduling structures, */ /* resulting in version 1.0a */ /* 03-01-1994 Verified version 1.0a */ /* 03-01-1994 Modified function interface, */ /* added register optimizations, */ /* moved validate resume function */ /* to this file, resulting in */ /* version 1.1 */ /* 03-18-1994 Verified version 1.1 */ /* */ /*************************************************************************/ STATUS TCCE_Resume_Service(NU_TASK *task_ptr) { TC_TCB *task; /* Task control block ptr */ STATUS status; /* Completion status */ /* Move task control block pointer into internal pointer. */ task = (TC_TCB *) task_ptr; /* Determine if the task pointer is valid. */ if ((task == NU_NULL) || (task -> tc_id != TC_TASK_ID)) /* Task pointer is invalid. */ status = NU_INVALID_TASK; /* Make sure that the task is suspended in an identical manner. */ else if (TCCE_Validate_Resume(NU_PURE_SUSPEND, task_ptr)) /* Task is not unconditionally suspended, return error status. */ status = NU_INVALID_RESUME; else /* Call the actual resume service. */ status = TCC_Resume_Service(task_ptr); /* Return the completion status. */ return(status); } /*************************************************************************/ /* */ /* FUNCTION */ /* */ /* TCCE_Suspend_Service */ /* */ /* DESCRIPTION */ /* */ /* This function performs error checking on the suspend service. */ /* */ /* CALLED BY */ /* */ /* Application */ /* */ /* CALLS */ /* */ /* TCC_Suspend_Service Actual suspend service */ /* function */ /* */ /* INPUTS */ /* */ /* task_ptr Task control block pointer */ /* */ /* OUTPUTS */ /* */ /* NU_SUCCESS If successful completion */ /* NU_INVALID_TASK Task pointer is invalid */ /* */ /* HISTORY */ /* */ /* DATE REMARKS */ /* */ /* 03-01-1993 Created initial version 1.0 */ /* 04-19-1993 Verified version 1.0 */ /* 03-01-1994 Modified function interface, */ /* added register optimizations, */ /* resulting in version 1.1 */ /* */ /* 03-18-1994 Verified version 1.1 */ /* */ /*************************************************************************/ STATUS TCCE_Suspend_Service(NU_TASK *task_ptr) { TC_TCB *task; /* Task control block ptr */ STATUS status; /* Completion status */ /* Move task control block pointer into internal pointer. */ task = (TC_TCB *) task_ptr; /* Determine if the task pointer is valid. */ if ((task == NU_NULL) || (task -> tc_id != TC_TASK_ID)) /* Task pointer is invalid. */ status = NU_INVALID_TASK; else if ((task->tc_status == NU_FINISHED) || (task->tc_status == NU_TERMINATED)) /* Can't suspend a task in a finished or terminated state */ status = NU_INVALID_SUSPEND; else /* Call the actual service routine. */ status = TCC_Suspend_Service(task_ptr); /* Return completion status. */ return(status); } /*************************************************************************/ /* */ /* FUNCTION */ /* */ /* TCCE_Relinquish */ /* */ /* DESCRIPTION */ /* */ /* This function performs error checking for the relinquish */ /* function. If the current thread is not a task, this request */ /* is ignored. */ /* */ /* CALLED BY */ /* */ /* Application */ /* */ /* CALLS */ /* */ /* TCC_Relinquish Actual relinquish function */ /* */ /* INPUTS */ /* */ /* None */ /* */ /* OUTPUTS */ /* */ /* None */ /* */ /* HISTORY */ /* */ /* DATE REMARKS */ /* */ /* 03-01-1993 Created initial version 1.0 */ /* 04-19-1993 Verified version 1.0 */ /* */ /*************************************************************************/ VOID TCCE_Relinquish(VOID) { TC_TCB *task; /* Pointer to task */ /* Pickup the current thread and place it in the task pointer. */ task = (TC_TCB *) TCD_Current_Thread; /* Determine if the current thread is a task. If so, call the actual relinquish routine. Otherwise, ignore the request. */ if ((task) && (task -> tc_id == TC_TASK_ID)) /* Valid request, call the relinquish function. */ TCC_Relinquish(); } /*************************************************************************/ /* */ /* FUNCTION */ /* */ /* TCCE_Task_Sleep */ /* */ /* DESCRIPTION */ /* */ /* This function performs error checking for the task sleep */ /* function. If the current thread is not a task, this request */ /* is ignored. */ /* */ /* CALLED BY */ /* */ /* Application */ /* */ /* CALLS */ /* */ /* TCC_Task_Sleep Actual task sleep function */ /* */ /* INPUTS */ /* */ /* ticks Number of ticks to sleep for */ /* */ /* OUTPUTS */ /* */ /* None */ /* */ /* HISTORY */ /* */ /* DATE REMARKS */ /* */ /* 03-01-1993 Created initial version 1.0 */ /* 04-19-1993 Verified version 1.0 */ /* 03-19-1996 Added check for parameter of 0 */ /* or negative number, resulting */ /* in version 1.1+ (spr037) */ /* */ /*************************************************************************/ VOID TCCE_Task_Sleep(UNSIGNED ticks) { TC_TCB *task; /* Pointer to task */ /* If parameter is zero, return */ if (ticks == 0) return; /* Pickup the current thread and place it in the task pointer. */ task = (TC_TCB *) TCD_Current_Thread; /* Determine if the current thread is a task. If so, call the actual task sleep routine. Otherwise, ignore the request. */ if ((task) && (task -> tc_id == TC_TASK_ID)) /* Valid request, call the sleep function. */ TCC_Task_Sleep(ticks); } /*************************************************************************/ /* */ /* FUNCTION */ /* */ /* TCCE_Suspend_Error */ /* */ /* DESCRIPTION */ /* */ /* This function checks for a suspend request error. Suspension */ /* requests are only allowed from task threads. A suspend request */ /* from any other thread is an error. */ /* */ /* CALLED BY */ /* */ /* Other Components */ /* */ /* CALLS */ /* */ /* None */ /* */ /* INPUTS */ /* */ /* None */ /* */ /* OUTPUTS */ /* */ /* NU_TRUE If an error is detected */ /* NU_FALSE If no error is detected */ /* */ /* HISTORY */ /* */ /* DATE REMARKS */ /* */ /* 03-01-1993 Created initial version 1.0 */ /* 04-19-1993 Verified version 1.0 */ /* */ /*************************************************************************/ INT TCCE_Suspend_Error(VOID) { TC_TCB *task; /* Task pointer */ INT status = NU_FALSE; /* Initialize to no error */ /* Setup the task pointer. */ task = (TC_TCB *) TCD_Current_Thread; /* Check for suspension errors. */ if (task == NU_NULL) /* Error, suspend request probably from initialization. */ status = NU_TRUE; else if (task -> tc_id != TC_TASK_ID) /* Control block is probably an HISR not a task. */ status = NU_TRUE; else if (task -> tc_signal_active) /* Called from a signal handler. */ status = NU_TRUE; /* Return status to caller. */ return(status); } /*************************************************************************/ /* */ /* FUNCTION */ /* */ /* TCCE_Activate_HISR */ /* */ /* DESCRIPTION */ /* */ /* This function performs error checking on the parameters supplied */ /* to the activate HISR function. */ /* */ /* CALLED BY */ /* */ /* Application */ /* */ /* CALLS */ /* */ /* TCT_Activate_HISR Actual HISR activate call */ /* */ /* INPUTS */ /* */ /* hisr_ptr HISR control block pointer */ /* */ /* OUTPUTS */ /* */ /* NU_INVALID_HISR Invalid HISR pointer */ /* */ /* HISTORY */ /* */ /* DATE REMARKS */ /* */ /* 03-01-1993 Created initial version 1.0 */ /* 04-19-1993 Verified version 1.0 */ /* 03-01-1994 Modified function interface, */ /* added register optimizations, */ /* resulting in version 1.1 */ /* */ /* 03-18-1994 Verified version 1.1 */ /* */ /*************************************************************************/ STATUS TCCE_Activate_HISR(NU_HISR *hisr_ptr) { TC_HCB *hisr; /* HISR control block ptr */ STATUS status; /* Completion status */ NU_SUPERV_USER_VARIABLES NU_SUPERVISOR_MODE(); /* Move input HISR control block pointer into internal pointer. */ hisr = (TC_HCB *) hisr_ptr; /* Check each parameter. */ if (hisr == NU_NULL) /* Invalid HISR control block pointer. */ status = NU_INVALID_HISR; else if (hisr -> tc_id != TC_HISR_ID) /* Invalid HISR control block pointer. */ status = NU_INVALID_HISR; else /* Call the routine to activate the HISR. */ status = TCT_Activate_HISR(hisr_ptr); /* Return to user mode */ NU_USER_MODE(); /* Return completion status. */ return(status); } /*************************************************************************/ /* */ /* FUNCTION */ /* */ /* TCCE_Validate_Resume */ /* */ /* DESCRIPTION */ /* */ /* This function validates the resume service and resume driver */ /* calls with scheduling protection around the examination of the */ /* task status. */ /* */ /* CALLED BY */ /* */ /* IOCE_Resume_Driver Driver error checking funct. */ /* TCCE_Resume_Service Error checking function */ /* */ /* CALLS */ /* */ /* TCT_Set_Current_Protect Setup current protect pointer*/ /* TCT_System_Protect Protect from system access */ /* TCT_System_Unprotect Release system protection */ /* TCT_Unprotect Release current protection */ /* */ /* INPUTS */ /* */ /* resume_type Type of resume request */ /* task_ptr Task control block pointer */ /* */ /* OUTPUTS */ /* */ /* NU_TRUE Invalid resume */ /* NU_FALSE Valid resume */ /* */ /* HISTORY */ /* */ /* DATE REMARKS */ /* */ /* 03-01-1994 Created initial version of */ /* function for version 1.0g */ /* 03-01-1994 Verified version 1.0g */ /* 03-01-1994 Modified function interface, */ /* added register optimizations, */ /* added system protection logic, */ /* moved to TCCE since it is an */ /* error interface function, */ /* resulting in version 1.1 */ /* */ /* 03-18-1994 Verified version 1.1 */ /* 10-16-1996 Modified to save the current */ /* thread's protection rather */ /* than that of the task being */ /* resumed (SPR212)(SPR268) */ /* */ /*************************************************************************/ STATUS TCCE_Validate_Resume(OPTION resume_type, NU_TASK *task_ptr) { R1 TC_TCB *task; /* Task control block ptr */ TC_PROTECT *save_protect; /* Save current protection */ STATUS status; /* Return status variable */ NU_SUPERV_USER_VARIABLES NU_SUPERVISOR_MODE(); /* Move input task pointer into internal pointer. */ task = (TC_TCB *) task_ptr; /* Save current protection. */ if (TCD_Current_Thread != NU_NULL) { save_protect = TCT_Get_Current_Protect(); } else { save_protect = NU_NULL; } /* Protect the scheduling structures from multiple access. */ TCT_System_Protect(); /* Does the resume type match the current status? */ if (task -> tc_status == resume_type) /* Indicate that there is no error. */ status = NU_FALSE; /* Check for a resumption of a delayed pure suspend. */ else if ((resume_type == NU_PURE_SUSPEND) && (task -> tc_delayed_suspend)) /* Indicate that there is no error. */ status = NU_FALSE; /* Check for a signal active and the saved status the same as the resume request. */ else if ((resume_type == task -> tc_saved_status) && (task -> tc_signal_active)) /* Indicate that there is no error. */ status = NU_FALSE; else /* Indicate that there is an error. */ status = NU_TRUE; /* Determine how to get out of protection. */ if (save_protect) { /* Restore current protection. */ TCT_Set_Current_Protect(save_protect); /* Release system protect. */ TCT_System_Unprotect(); } else /* Release protection of system structures. */ TCT_Unprotect(); /* Return to user mode */ NU_USER_MODE(); /* Return status to caller. */ return(status); }