51d69a1aea
If we handle an interrupt just before the 'wait' and the interrupt schedules some work, we need to skip the 'wait' call. The simple solution of calling sched_runnable() with interrupts disabled immediately before wait still leaves a window after the call and before 'wait' in which the same issue can occur. The solution implemented is to check the EPC in the interrupt handler, and if it is in a region before the 'wait' call, to fix up the EPC to skip the wait call. Reported/analysed by: adrian Fix suggested by: kib Reviewed by: jmallett, imp
86 lines
2.9 KiB
C
86 lines
2.9 KiB
C
/*-
|
|
* Copyright (c) 1995 Bruce D. Evans.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the author nor the names of contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* from: src/sys/i386/include/md_var.h,v 1.35 2000/02/20 20:51:23 bsd
|
|
* JNPR: md_var.h,v 1.4 2006/10/16 12:30:34 katta
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef _MACHINE_MD_VAR_H_
|
|
#define _MACHINE_MD_VAR_H_
|
|
|
|
#include <machine/reg.h>
|
|
|
|
/*
|
|
* Miscellaneous machine-dependent declarations.
|
|
*/
|
|
extern long Maxmem;
|
|
extern char sigcode[];
|
|
extern int szsigcode, szosigcode;
|
|
extern uint32_t *vm_page_dump;
|
|
extern int vm_page_dump_size;
|
|
|
|
extern vm_offset_t kstack0;
|
|
extern vm_offset_t kernel_kseg0_end;
|
|
|
|
void MipsSaveCurFPState(struct thread *);
|
|
void fork_trampoline(void);
|
|
void cpu_swapin(struct proc *);
|
|
uintptr_t MipsEmulateBranch(struct trapframe *, uintptr_t, int, uintptr_t);
|
|
void MipsSwitchFPState(struct thread *, struct trapframe *);
|
|
u_long kvtop(void *addr);
|
|
int is_cacheable_mem(vm_paddr_t addr);
|
|
void mips_generic_reset(void);
|
|
void mips_wait(void);
|
|
|
|
#define MIPS_DEBUG 0
|
|
|
|
#if MIPS_DEBUG
|
|
#define MIPS_DEBUG_PRINT(fmt, args...) printf("%s: " fmt "\n" , __FUNCTION__ , ## args)
|
|
#else
|
|
#define MIPS_DEBUG_PRINT(fmt, args...)
|
|
#endif
|
|
|
|
void mips_vector_init(void);
|
|
void mips_cpu_init(void);
|
|
void mips_pcpu0_init(void);
|
|
void mips_proc0_init(void);
|
|
void mips_postboot_fixup(void);
|
|
|
|
/* Platform call-downs. */
|
|
void platform_identify(void);
|
|
|
|
extern int busdma_swi_pending;
|
|
void busdma_swi(void);
|
|
|
|
struct dumperinfo;
|
|
void dump_add_page(vm_paddr_t);
|
|
void dump_drop_page(vm_paddr_t);
|
|
void minidumpsys(struct dumperinfo *);
|
|
#endif /* !_MACHINE_MD_VAR_H_ */
|