FreeCalypso > hg > fc-tourmaline
view src/nucleus/hid.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 |
line wrap: on
line source
/*************************************************************************/ /* */ /* 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 */ /* */ /* hid.c Nucleus PLUS 1.14 */ /* */ /* COMPONENT */ /* */ /* HI - History Management */ /* */ /* DESCRIPTION */ /* */ /* This file contains global data structures for use within the */ /* History Management component. */ /* */ /* DATA STRUCTURES */ /* */ /* HID_History_Enable History saving enabled flag */ /* HID_Write_Index Current write index into */ /* history table */ /* HID_Read_Index Current read index into */ /* history table */ /* HID_Entry_Count Number of entries in the */ /* table counter */ /* HID_History_Protect History protection */ /* */ /* FUNCTIONS */ /* */ /* None */ /* */ /* DEPENDENCIES */ /* */ /* hi_defs.h History Management 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, */ /* 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 "hi_defs.h" /* History constants */ /* HID_History_Enable is a flag that indicates whether or not history saving is enabled. If this value is NU_FALSE, history saving is disabled. Otherwise, history saving is enabled. */ INT HID_History_Enable; /* HID_Write_Index is the index of the next available entry in the history table. */ INT HID_Write_Index; /* HID_Read_Index is the index of the oldest entry in the history table. */ INT HID_Read_Index; /* HID_Entry_Count keeps track of the number of entries currently in the history table. */ INT HID_Entry_Count; /* HID_History_Protect is a protection structure used to block any other thread from access to the history data structures. */ TC_PROTECT HID_History_Protect;