ae4f073c40
We handle many exceptions at EVT5 (hardware error level) so that we can catch exceptions in our exception handling code. Today - if the global interrupt enable bit (IPEND[4]) is set (interrupts disabled) our trap handling code goes into a infinite loop, since we need interrupts to be on to defer things to EVT5. Normal kernel code should not trigger this for any reason as IPEND[4] gets cleared early (when doing an interrupt context save) and the kernel stack there should be sane (or something much worse is happening in the system). But there have been a few times where this has happened, so this change makes sure we dump a proper crash message even when things have gone south. Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
/*
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* File: arch/blackfin/include/asm/pda.h
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* Author: Philippe Gerum <rpm@xenomai.org>
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*
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* Copyright 2007 Analog Devices Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _ASM_BLACKFIN_PDA_H
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#define _ASM_BLACKFIN_PDA_H
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#include <mach/anomaly.h>
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#ifndef __ASSEMBLY__
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struct blackfin_pda { /* Per-processor Data Area */
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struct blackfin_pda *next;
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unsigned long syscfg;
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#ifdef CONFIG_SMP
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unsigned long imask; /* Current IMASK value */
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#endif
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unsigned long *ipdt; /* Start of switchable I-CPLB table */
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unsigned long *ipdt_swapcount; /* Number of swaps in ipdt */
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unsigned long *dpdt; /* Start of switchable D-CPLB table */
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unsigned long *dpdt_swapcount; /* Number of swaps in dpdt */
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/*
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* Single instructions can have multiple faults, which
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* need to be handled by traps.c, in irq5. We store
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* the exception cause to ensure we don't miss a
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* double fault condition
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*/
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unsigned long ex_iptr;
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unsigned long ex_optr;
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unsigned long ex_buf[4];
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unsigned long ex_imask; /* Saved imask from exception */
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unsigned long ex_ipend; /* Saved IPEND from exception */
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unsigned long *ex_stack; /* Exception stack space */
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#ifdef ANOMALY_05000261
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unsigned long last_cplb_fault_retx;
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#endif
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unsigned long dcplb_fault_addr;
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unsigned long icplb_fault_addr;
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unsigned long retx;
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unsigned long seqstat;
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unsigned int __nmi_count; /* number of times NMI asserted on this CPU */
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};
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extern struct blackfin_pda cpu_pda[];
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_BLACKFIN_PDA_H */
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