diff options
| author | Matthew Ogilvie <mmogilvi_qemu@miniinfo.net> | 2012-08-23 00:24:43 -0600 |
|---|---|---|
| committer | malc <av1474@comtv.ru> | 2012-08-24 07:44:39 +0400 |
| commit | f278d4947fff814dcde2ef2acad36d172ff8be35 (patch) | |
| tree | c483f5871bb83294728a3b3026206c56ad7485a9 /cpu-exec.c | |
| parent | 482f7bf86b43af9f6903c52726fedf82b28bf953 (diff) | |
i8259: add -no-spurious-interrupt-hack option
This patch provides a way to optionally suppress spurious interrupts,
as a workaround for systems described below:
Some old operating systems do not handle spurious interrupts well,
and qemu tends to generate them significantly more often than
real hardware.
Examples:
- Microport UNIX System V/386 v 2.1 (ca 1987)
(The main problem I'm fixing: Without this patch, it panics
sporadically when accessing the hard disk.)
- AT&T UNIX System V/386 Release 4.0 Version 2.1a (ca 1991)
See screenshot in "QEMU Official OS Support List":
http://www.claunia.com/qemu/objectManager.php?sClass=application&iId=9
(I don't have this system to test.)
- A report about OS/2 boot lockup from 2004 by Hampa Hug:
http://lists.nongnu.org/archive/html/qemu-devel/2004-09/msg00367.html
(My patch was partially inspired by his.)
Also: http://lists.nongnu.org/archive/html/qemu-devel/2005-06/msg00243.html
(I don't have this system to test.)
Signed-off-by: Matthew Ogilvie <mmogilvi_qemu@miniinfo.net>
Signed-off-by: malc <av1474@comtv.ru>
Diffstat (limited to 'cpu-exec.c')
| -rw-r--r-- | cpu-exec.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/cpu-exec.c b/cpu-exec.c index 134b3c4fcf..625fbb0e0f 100644 --- a/cpu-exec.c +++ b/cpu-exec.c @@ -329,11 +329,15 @@ int cpu_exec(CPUArchState *env) 0); env->interrupt_request &= ~(CPU_INTERRUPT_HARD | CPU_INTERRUPT_VIRQ); intno = cpu_get_pic_interrupt(env); - qemu_log_mask(CPU_LOG_TB_IN_ASM, "Servicing hardware INT=0x%02x\n", intno); - do_interrupt_x86_hardirq(env, intno, 1); - /* ensure that no TB jump will be modified as - the program flow was changed */ - next_tb = 0; + if (intno >= 0) { + qemu_log_mask(CPU_LOG_TB_IN_ASM, + "Servicing hardware INT=0x%02x\n", + intno); + do_interrupt_x86_hardirq(env, intno, 1); + /* ensure that no TB jump will be modified as + the program flow was changed */ + next_tb = 0; + } #if !defined(CONFIG_USER_ONLY) } else if ((interrupt_request & CPU_INTERRUPT_VIRQ) && (env->eflags & IF_MASK) && |