Bug #647 » vkhalt-HEAD.patch
| share/man/man7/vkernel.7 10 Jun 2007 23:09:02 -0000 | ||
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.Xr tap 4
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device.
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.Sh SIGNALS
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The virtual kernel enables all terminal signals while in
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.Xr ddb 4
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mode but only enables
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The virtual kernel only enables SIGQUIT and SIGTERM while operating in
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regular console mode. Sending
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.Ql \&^\e
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.Pq Dv SIGQUIT
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while operating as a console which causes the virtual kernel to enter its
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internal
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to the virtual kernel causes the virtual kernel to enter its internal
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.Xr ddb 4
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debugger.
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debugger and re-enable all other terminal signals. Sending SIGTERM to the
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virtual kernel triggers a clean shutdown by passing a SIGUSR2 to the
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virtual kernel's
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.Xr init 8
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process.
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.Sh DEBUGGING
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It is possible to directly gdb the virtual kernel's process.
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It is recommended that you do a
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| sys/platform/vkernel/i386/cpu_regs.c 10 Jun 2007 22:43:22 -0000 | ||
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if (cpu_idle_hlt && !lwkt_runnable() &&
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(td->td_flags & TDF_IDLE_NOHLT) == 0) {
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splz();
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if (mdcpu->gd_shutdown)
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exc_shutdown();
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signalmailbox(NULL);
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if (!lwkt_runnable()) {
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sigpause(0);
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| ... | ... | |
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} else {
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td->td_flags &= ~TDF_IDLE_NOHLT;
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splz();
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if (mdcpu->gd_shutdown)
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exc_shutdown();
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signalmailbox(NULL);
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#ifdef SMP
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/*__asm __volatile("sti; pause");*/
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| sys/platform/vkernel/i386/exception.c 10 Jun 2007 22:49:31 -0000 | ||
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#include <sys/types.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/reboot.h>
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#include <ddb/ddb.h>
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#include <sys/thread2.h>
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| ... | ... | |
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int _udatasel = LSEL(LUDATA_SEL, SEL_UPL);
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static void exc_segfault(int signo, siginfo_t *info, void *ctx);
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void exc_shutdown( void );
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#ifdef DDB
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static void exc_debugger(int signo, siginfo_t *info, void *ctx);
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#endif
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sigemptyset(&sa.sa_mask);
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sigaction(SIGSEGV, &sa, NULL);
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sigaction(SIGTRAP, &sa, NULL);
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#ifdef DDB
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sa.sa_sigaction = exc_debugger;
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sigaction(SIGQUIT, &sa, NULL);
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#endif
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bzero(&sa, sizeof(sa));
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sigemptyset(&sa.sa_mask);
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sa.sa_flags |= SA_MAILBOX | SA_NODEFER;
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sa.sa_mailbox = &mdcpu->gd_shutdown;
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sigaction(SIGTERM, &sa, NULL);
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}
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/*
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splz();
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}
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/*
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* This function handles external signals for shutdown.
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*
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* Currently, when a vkernel recieves a SIGTERM, either the VKERNEL init(8)
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* is signaled with SIGUSR2, or simply shuts down, preventing filesystem
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* checks from being needed upon reboot.
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*/
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void
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exc_shutdown( void )
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{
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mdcpu->gd_shutdown = 0;
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kprintf("Caught SIGTERM from host system. Shutting down...\n");
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if (initproc != NULL) {
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ksignal(initproc, SIGUSR2);
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}
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else {
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reboot(RB_POWEROFF);
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}
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}
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#ifdef DDB
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static void
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| sys/platform/vkernel/i386/trap.c 10 Jun 2007 22:43:41 -0000 | ||
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* user_trap() when we break out of it (usually due to a signal).
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*/
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for (;;) {
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/*
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* Handle shutdown requests before attempting anything
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*/
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if (mdcpu->gd_shutdown)
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exc_shutdown();
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/*
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* Tell the real kernel whether it is ok to use the FP
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* unit or not.
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| sys/platform/vkernel/include/globaldata.h 10 Jun 2007 21:10:26 -0000 | ||
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int gd_spending; /* software interrupt pending */
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int gd_sdelayed; /* delayed software ints */
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int gd_currentldt;
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int gd_mailbox; /* signal delivery mailbox */
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int gd_mailbox; /* I/O signal delivery mailbox */
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int gd_shutdown; /* Shutdown signal delivery mailbox */
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u_int unused001;
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u_int gd_other_cpus;
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u_int gd_ss_eflags;
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