/*
* Enter debugger. Called when the user types ctrl-alt-d or whenever
* code wants to enter the debugger and possibly resume later.
*
* msg: message to print, possibly NULL.
*/
void
debug_enter(char *msg)
{
if (dtrace_debugger_init != NULL)
(*dtrace_debugger_init)();
if (msg != NULL || (boothowto & RB_DEBUG))
prom_printf("\n");
if (msg != NULL)
prom_printf("%s\n", msg);
if (boothowto & RB_DEBUG)
kmdb_enter();
if (dtrace_debugger_fini != NULL)
(*dtrace_debugger_fini)();
}
/*
* Drop the prom lock if it is held by the current CPU. If the lock is held
* recursively, return without clearing prom_cpu. If the hold count is now
* zero, clear prom_cpu and cv_signal any waiting CPU.
*/
void
kern_postprom(void)
{
processorid_t cpuid = getprocessorid();
cpu_t *cp = cpu[cpuid];
if (panicstr)
return; /* do not modify lock further if we have panicked */
if (prom_cpu != cp)
panic("kern_postprom: not owner, cp=%p owner=%p",
(void *)cp, (void *)prom_cpu);
if (prom_holdcnt == 0)
panic("kern_postprom: prom_holdcnt == 0, owner=%p",
(void *)prom_cpu);
if (atomic_dec_32_nv(&prom_holdcnt) != 0)
return; /* prom lock is held recursively by this CPU */
if ((boothowto & RB_DEBUG) && prom_exit_enter_debugger)
kmdb_enter();
prom_thread = NULL;
membar_producer();
prom_cpu = NULL;
membar_producer();
if (CPU_IN_SET(cpu_ready_set, cpuid) && cp->cpu_m.mutex_ready) {
mutex_enter(&prom_mutex);
cv_signal(&prom_cv);
mutex_exit(&prom_mutex);
kpreempt_enable();
}
}
