FreeCalypso > hg > fc-tourmaline
view src/nucleus/tmi.c @ 268:f2e52cab0a73
abb_inth.c: check all interrupt causes, not just one
The original code used if - else if - else if etc constructs, thus
the first detected interrupt was the only one handled. However,
Iota ITSTATREG is a clear-on-read register, thus if we only handle
the first detected interrupt and skip checking the others, then the
other interrupts will be lost, if more than one interrupt happened
to occur in one ABB interrupt handling cycle - a form of rare race
condition. Change the code to check all interrupts that were read
in this cycle.
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Sun, 13 Jun 2021 18:17:53 +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 */ /* */ /* tmi.c Nucleus PLUS 1.14 */ /* */ /* COMPONENT */ /* */ /* TM - Timer Management */ /* */ /* DESCRIPTION */ /* */ /* This file contains the initialization routine for the timer */ /* management component. */ /* */ /* DATA STRUCTURES */ /* */ /* None */ /* */ /* FUNCTIONS */ /* */ /* TMI_Initialize Timer Management Initialize */ /* */ /* DEPENDENCIES */ /* */ /* tc_extr.h Task function interfaces */ /* er_extr.h Error handling function */ /* tm_defs.h Timer component constants */ /* */ /* HISTORY */ /* */ /* DATE REMARKS */ /* */ /* 03-01-1993 Created initial version 1.0 */ /* 04-19-1993 Verified version 1.0 */ /* 08-09-1993 Removed timer task creation, */ /* cleared the ID of the HISR */ /* control block, and casted the */ /* HISR priority, resulting in */ /* version 1.0a */ /* 08-09-1993 Verified version 1.0a */ /* 03-01-1994 Changed names of HISR create */ /* function, removed reference to */ /* timer list protect since it */ /* was deleted, resulting in */ /* version 1.1 */ /* */ /* 03-18-1994 Verified version 1.1 */ /* 04-17-1996 updated to version 1.2 */ /* 03-24-1998 Released version 1.3 */ /* 03-26-1999 Released 1.11m (new release */ /* numbering scheme) */ /* 04-17-2002 Released version 1.13m */ /* 11-07-2002 Released version 1.14 */ /*************************************************************************/ #define NU_SOURCE_FILE #include "tc_extr.h" /* Task control functions */ #include "er_extr.h" /* Error handling function */ #include "tm_defs.h" /* Timer constants */ #include "tm_extr.h" /* Timer interfaces */ /* Define external inner-component global data references. */ extern CS_NODE *TMD_Created_Timers_List; extern UNSIGNED TMD_Total_Timers; extern TM_TCB *TMD_Active_Timers_List; extern INT TMD_Active_List_Busy; extern TC_PROTECT TMD_Created_List_Protect; extern UNSIGNED TMD_System_Clock; extern UNSIGNED TMD_Timer; extern INT TMD_Timer_State; extern UNSIGNED TMD_Time_Slice; extern TC_TCB *TMD_Time_Slice_Task; extern INT TMD_Time_Slice_State; extern TC_HCB TMD_HISR; extern VOID *TMD_HISR_Stack_Ptr; extern UNSIGNED TMD_HISR_Stack_Size; extern INT TMD_HISR_Priority; /* Define inner-component function prototypes. */ VOID TMC_Timer_HISR(VOID); /*************************************************************************/ /* */ /* FUNCTION */ /* */ /* TMI_Initialize */ /* */ /* DESCRIPTION */ /* */ /* This function initializes the data structures that control the */ /* operation of the timer component (TM). There are no application */ /* timers created initially. This routine must be called from */ /* Supervisor mode in Supervisor/User mode switching kernels. */ /* */ /* CALLED BY */ /* */ /* INC_Initialize System initialization */ /* */ /* CALLS */ /* */ /* ERC_System_Error System error handing function*/ /* TCC_Create_HISR Create timer HISR */ /* TCCE_Create_HISR Create timer HISR (error chk)*/ /* */ /* INPUTS */ /* */ /* (Indirect) */ /* TMD_HISR_Stack_Ptr Pointer to HISR stack area */ /* TMD_HISR_Stack_Size Size of HISR stack */ /* TMD_HISR_Priority Priority of timer HISR */ /* */ /* OUTPUTS */ /* */ /* TMD_Created_Timers_List Pointer to the linked-list */ /* of created application */ /* timers */ /* TMD_Total_Timers Total number of created */ /* application timers */ /* TMD_Active_Timers_List Pointer to the linked-list */ /* of active timers. */ /* TMD_Active_List_Busy Flag indicating that the */ /* active timer list is in use*/ /* TMD_Created_List_Protect Created timer list protect */ /* structure */ /* TMD_System_Clock System clock */ /* TMD_Timer Timer count-down value */ /* TMD_Timer_State State of timer */ /* TMD_Time_Slice Time slice count-down value */ /* TMD_Time_Slice_Task Pointer to task to time-slice*/ /* TMD_Time_Slice_State State of time slice */ /* TMD_HISR Timer HISR control block */ /* */ /* HISTORY */ /* */ /* DATE REMARKS */ /* */ /* 03-01-1993 Created initial version 1.0 */ /* 04-19-1993 Verified version 1.0 */ /* 08-09-1993 Removed timer task creation, */ /* cleared the ID of the HISR */ /* control block, and casted the */ /* HISR priority, resulting in */ /* version 1.0a */ /* 08-09-1993 Verified version 1.0a */ /* 03-01-1994 Modified HISR create function */ /* interface, removed reference */ /* to timer list protect since it */ /* was deleted, resulting in */ /* version 1.1 */ /* */ /* 03-18-1994 Verified version 1.1 */ /* */ /*************************************************************************/ VOID TMI_Initialize(VOID) { STATUS status; /* Return status of creates */ /* Initialize the created application timer's list to NU_NULL. */ TMD_Created_Timers_List = NU_NULL; /* Initialize the total number of created application timers to 0. */ TMD_Total_Timers = 0; /* Initialize the active timer's list to NU_NULL. */ TMD_Active_Timers_List = NU_NULL; /* Clear the active timer list busy flag. */ TMD_Active_List_Busy = NU_FALSE; /* Initialize the system clock to 0. */ TMD_System_Clock = 0; /* Initialize the timer to 0 and the timer state to "not active." */ TMD_Timer = 0; TMD_Timer_State = TM_NOT_ACTIVE; /* Initialize the time-slice timer, task pointer, and the associated state variable. */ TMD_Time_Slice = 0; TMD_Time_Slice_Task = NU_NULL; TMD_Time_Slice_State = TM_NOT_ACTIVE; /* Initialize the list protection structures. */ TMD_Created_List_Protect.tc_tcb_pointer = NU_NULL; /* Clear out the timer HISR control block. */ TMD_HISR.tc_id = 0; /* Create the timer HISR. The timer HISR is responsible for performing the time slice function and activating the timer task if necessary. */ #ifdef NU_NO_ERROR_CHECKING status = TCC_Create_HISR((NU_HISR *) &TMD_HISR, "SYSTEM H", TMC_Timer_HISR, (OPTION) TMD_HISR_Priority, TMD_HISR_Stack_Ptr, TMD_HISR_Stack_Size); #else status = TCCE_Create_HISR((NU_HISR *) &TMD_HISR, "SYSTEM H", TMC_Timer_HISR, (OPTION) TMD_HISR_Priority, TMD_HISR_Stack_Ptr, TMD_HISR_Stack_Size); #endif /* Check for a system error creating the timer HISR. */ if (status != NU_SUCCESS) /* Call the system error handler. */ ERC_System_Error(NU_ERROR_CREATING_TIMER_HISR); }