FreeCalypso > hg > fc-tourmaline
view src/nucleus/ioi.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 */ /* */ /* ioi.c Nucleus PLUS 1.14 */ /* */ /* COMPONENT */ /* */ /* IO - Input/Output Driver Management */ /* */ /* DESCRIPTION */ /* */ /* This file contains the initialization routine for the I/O Driver */ /* Management component. */ /* */ /* DATA STRUCTURES */ /* */ /* None */ /* */ /* FUNCTIONS */ /* */ /* IOI_Initialize I/O Driver Initialize */ /* */ /* DEPENDENCIES */ /* */ /* io_defs.h I/O Driver component consts */ /* tc_defs.h Thread control constants */ /* */ /* HISTORY */ /* */ /* DATE REMARKS */ /* */ /* 03-01-1993 Created initial version 1.0 */ /* 04-19-1993 Verified version 1.0 */ /* 03-01-1994 Updated copyright notice, */ /* changed "void" to VOID, */ /* 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 "io_defs.h" /* I/O driver constants */ #include "io_extr.h" /* I/O driver interfaces */ #include "tc_defs.h" /* Thread control constants */ /* Define external inner-component global data references. */ extern CS_NODE *IOD_Created_Drivers_List; extern UNSIGNED IOD_Total_Drivers; extern TC_PROTECT IOD_List_Protect; /*************************************************************************/ /* */ /* FUNCTION */ /* */ /* IOI_Initialize */ /* */ /* DESCRIPTION */ /* */ /* This function initializes the data structures that control the */ /* operation of the I/O driver component (IO). There are no I/O */ /* drivers initially. This routine must be called from Supervisor */ /* mode in Supervisor/User mode switched kernels. */ /* */ /* CALLED BY */ /* */ /* INC_Initialize System initialization */ /* */ /* CALLS */ /* */ /* None */ /* */ /* INPUTS */ /* */ /* None */ /* */ /* OUTPUTS */ /* */ /* IOD_Created_Drivers_List List of created I/O drivers */ /* IOD_Total_Drivers Number of created I/O drivers*/ /* IOD_List_Protect Protection for driver list */ /* */ /* HISTORY */ /* */ /* DATE REMARKS */ /* */ /* 03-01-1993 Created initial version 1.0 */ /* 04-19-1993 Verified version 1.0 */ /* 03-01-1994 Updated copyright notice, */ /* changed "void" to "VOID", */ /* resulting in version 1.1 */ /* */ /* 03-18-1994 Verified version 1.1 */ /* */ /*************************************************************************/ VOID IOI_Initialize(VOID) { /* Initialize the created I/O driver list to NU_NULL. */ IOD_Created_Drivers_List = NU_NULL; /* Initialize the total number of created I/O drivers to 0. */ IOD_Total_Drivers = 0; /* Initialize the list protection structure. */ IOD_List_Protect.tc_tcb_pointer = NU_NULL; }