diff options
Diffstat (limited to 'sim/ppc/events.c')
| -rw-r--r-- | sim/ppc/events.c | 408 |
1 files changed, 0 insertions, 408 deletions
diff --git a/sim/ppc/events.c b/sim/ppc/events.c deleted file mode 100644 index 72c91386bea..00000000000 --- a/sim/ppc/events.c +++ /dev/null @@ -1,408 +0,0 @@ -/* This file is part of the program psim. - - Copyright (C) 1994-1998, Andrew Cagney <cagney@highland.com.au> - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2 of the License, or - (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. - - */ - - -#ifndef _EVENTS_C_ -#define _EVENTS_C_ - -#include "basics.h" -#include "events.h" - -#include <signal.h> - -#if !defined (SIM_EVENTS_POLL_RATE) -#define SIM_EVENTS_POLL_RATE 0x1000 -#endif - - - -/* The event queue maintains a single absolute time using two - variables. - - TIME_OF_EVENT: this holds the time at which the next event is ment - to occure. If no next event it will hold the time of the last - event. - - TIME_FROM_EVENT: The current distance from TIME_OF_EVENT. If an - event is pending, this will be positive. If no future event is - pending this will be negative. This variable is decremented once - for each iteration of a clock cycle. - - Initially, the clock is started at time one (1) with TIME_OF_EVENT - == 0 and TIME_FROM_EVENT == -1. - - Clearly there is a bug in that this code assumes that the absolute - time counter will never become greater than 2^62. */ - -typedef struct _event_entry event_entry; -struct _event_entry { - void *data; - event_handler *handler; - signed64 time_of_event; - event_entry *next; -}; - -struct _event_queue { - int processing; - event_entry *queue; - event_entry *volatile held; - event_entry *volatile *volatile held_end; - signed64 time_of_event; - signed64 time_from_event; -}; - - -STATIC_INLINE_EVENTS\ -(void) -sim_events_poll (void *data) -{ - event_queue *queue = data; - /* just re-schedule in 1000 million ticks time */ - event_queue_schedule (queue, SIM_EVENTS_POLL_RATE, sim_events_poll, queue); - sim_io_poll_quit (); -} - - -INLINE_EVENTS\ -(event_queue *) -event_queue_create(void) -{ - event_queue *new_event_queue = ZALLOC(event_queue); - - new_event_queue->processing = 0; - new_event_queue->queue = NULL; - new_event_queue->held = NULL; - new_event_queue->held_end = &new_event_queue->held; - - /* both times are already zero */ - return new_event_queue; -} - - -INLINE_EVENTS\ -(void) -event_queue_init(event_queue *queue) -{ - event_entry *event; - - /* drain the interrupt queue */ - { -#if defined(HAVE_SIGPROCMASK) && defined(SIG_SETMASK) - sigset_t old_mask; - sigset_t new_mask; - sigfillset(&new_mask); - /*-LOCK-*/ sigprocmask(SIG_SETMASK, &new_mask, &old_mask); -#endif - event = queue->held; - while (event != NULL) { - event_entry *dead = event; - event = event->next; - zfree(dead); - } - queue->held = NULL; - queue->held_end = &queue->held; -#if defined(HAVE_SIGPROCMASK) && defined(SIG_SETMASK) - /*-UNLOCK-*/ sigprocmask(SIG_SETMASK, &old_mask, NULL); -#endif - } - - /* drain the normal queue */ - event = queue->queue; - while (event != NULL) { - event_entry *dead = event; - event = event->next; - zfree(dead); - } - queue->queue = NULL; - - /* wind time back to one */ - queue->processing = 0; - queue->time_of_event = 0; - queue->time_from_event = -1; - - /* schedule our initial counter event */ - event_queue_schedule (queue, 0, sim_events_poll, queue); -} - -INLINE_EVENTS\ -(signed64) -event_queue_time(event_queue *queue) -{ - return queue->time_of_event - queue->time_from_event; -} - -STATIC_INLINE_EVENTS\ -(void) -update_time_from_event(event_queue *events) -{ - signed64 current_time = event_queue_time(events); - if (events->queue != NULL) { - events->time_from_event = (events->queue->time_of_event - current_time); - events->time_of_event = events->queue->time_of_event; - } - else { - events->time_of_event = current_time - 1; - events->time_from_event = -1; - } - if (WITH_TRACE && ppc_trace[trace_events]) - { - event_entry *event; - int i; - for (event = events->queue, i = 0; - event != NULL; - event = event->next, i++) - { - TRACE(trace_events, ("event time-from-event - time %ld, delta %ld - event %d, tag 0x%lx, time %ld, handler 0x%lx, data 0x%lx\n", - (long)current_time, - (long)events->time_from_event, - i, - (long)event, - (long)event->time_of_event, - (long)event->handler, - (long)event->data)); - } - } - ASSERT(current_time == event_queue_time(events)); -} - -STATIC_INLINE_EVENTS\ -(void) -insert_event_entry(event_queue *events, - event_entry *new_event, - signed64 delta) -{ - event_entry *curr; - event_entry **prev; - signed64 time_of_event; - - if (delta < 0) - error("what is past is past!\n"); - - /* compute when the event should occure */ - time_of_event = event_queue_time(events) + delta; - - /* find the queue insertion point - things are time ordered */ - prev = &events->queue; - curr = events->queue; - while (curr != NULL && time_of_event >= curr->time_of_event) { - ASSERT(curr->next == NULL - || curr->time_of_event <= curr->next->time_of_event); - prev = &curr->next; - curr = curr->next; - } - ASSERT(curr == NULL || time_of_event < curr->time_of_event); - - /* insert it */ - new_event->next = curr; - *prev = new_event; - new_event->time_of_event = time_of_event; - - /* adjust the time until the first event */ - update_time_from_event(events); -} - -INLINE_EVENTS\ -(event_entry_tag) -event_queue_schedule(event_queue *events, - signed64 delta_time, - event_handler *handler, - void *data) -{ - event_entry *new_event = ZALLOC(event_entry); - new_event->data = data; - new_event->handler = handler; - insert_event_entry(events, new_event, delta_time); - TRACE(trace_events, ("event scheduled at %ld - tag 0x%lx - time %ld, handler 0x%lx, data 0x%lx\n", - (long)event_queue_time(events), - (long)new_event, - (long)new_event->time_of_event, - (long)new_event->handler, - (long)new_event->data)); - return (event_entry_tag)new_event; -} - - -INLINE_EVENTS\ -(event_entry_tag) -event_queue_schedule_after_signal(event_queue *events, - signed64 delta_time, - event_handler *handler, - void *data) -{ - event_entry *new_event = ZALLOC(event_entry); - - new_event->data = data; - new_event->handler = handler; - new_event->time_of_event = delta_time; /* work it out later */ - new_event->next = NULL; - - { -#if defined(HAVE_SIGPROCMASK) && defined(SIG_SETMASK) - sigset_t old_mask; - sigset_t new_mask; - sigfillset(&new_mask); - /*-LOCK-*/ sigprocmask(SIG_SETMASK, &new_mask, &old_mask); -#endif - if (events->held == NULL) { - events->held = new_event; - } - else { - *events->held_end = new_event; - } - events->held_end = &new_event->next; -#if defined(HAVE_SIGPROCMASK) && defined(SIG_SETMASK) - /*-UNLOCK-*/ sigprocmask(SIG_SETMASK, &old_mask, NULL); -#endif - } - - TRACE(trace_events, ("event scheduled at %ld - tag 0x%lx - time %ld, handler 0x%lx, data 0x%lx\n", - (long)event_queue_time(events), - (long)new_event, - (long)new_event->time_of_event, - (long)new_event->handler, - (long)new_event->data)); - - return (event_entry_tag)new_event; -} - - -INLINE_EVENTS\ -(void) -event_queue_deschedule(event_queue *events, - event_entry_tag event_to_remove) -{ - event_entry *to_remove = (event_entry*)event_to_remove; - ASSERT((events->time_from_event >= 0) == (events->queue != NULL)); - if (event_to_remove != NULL) { - event_entry *current; - event_entry **ptr_to_current; - for (ptr_to_current = &events->queue, current = *ptr_to_current; - current != NULL && current != to_remove; - ptr_to_current = ¤t->next, current = *ptr_to_current); - if (current == to_remove) { - *ptr_to_current = current->next; - TRACE(trace_events, ("event descheduled at %ld - tag 0x%lx - time %ld, handler 0x%lx, data 0x%lx\n", - (long)event_queue_time(events), - (long)event_to_remove, - (long)current->time_of_event, - (long)current->handler, - (long)current->data)); - zfree(current); - update_time_from_event(events); - } - else { - TRACE(trace_events, ("event descheduled at %ld - tag 0x%lx - not found\n", - (long)event_queue_time(events), - (long)event_to_remove)); - } - } - ASSERT((events->time_from_event >= 0) == (events->queue != NULL)); -} - - - - -INLINE_EVENTS\ -(int) -event_queue_tick(event_queue *events) -{ - signed64 time_from_event; - - /* we should only be here when the previous tick has been fully processed */ - ASSERT(!events->processing); - - /* move any events that were queued by any signal handlers onto the - real event queue. BTW: When inlining, having this code here, - instead of in event_queue_process() causes GCC to put greater - weight on keeping the pointer EVENTS in a register. This, in - turn results in better code being output. */ - if (events->held != NULL) { - event_entry *held_events; - event_entry *curr_event; - - { -#if defined(HAVE_SIGPROCMASK) && defined(SIG_SETMASK) - sigset_t old_mask; - sigset_t new_mask; - sigfillset(&new_mask); - /*-LOCK-*/ sigprocmask(SIG_SETMASK, &new_mask, &old_mask); -#endif - held_events = events->held; - events->held = NULL; - events->held_end = &events->held; -#if defined(HAVE_SIGPROCMASK) && defined(SIG_SETMASK) - /*-UNLOCK-*/ sigprocmask(SIG_SETMASK, &old_mask, NULL); -#endif - } - - do { - curr_event = held_events; - held_events = curr_event->next; - insert_event_entry(events, curr_event, curr_event->time_of_event); - } while (held_events != NULL); - } - - /* advance time, checking to see if we've reached time zero which - would indicate the time for the next event has arrived */ - time_from_event = events->time_from_event; - events->time_from_event = time_from_event - 1; - return time_from_event == 0; -} - - - -INLINE_EVENTS\ -(void) -event_queue_process(event_queue *events) -{ - signed64 event_time = event_queue_time(events); - - ASSERT((events->time_from_event == -1 && events->queue != NULL) - || events->processing); /* something to do */ - - /* consume all events for this or earlier times. Be careful to - allow a new event to appear under our feet */ - events->processing = 1; - while (events->queue != NULL - && events->queue->time_of_event <= event_time) { - event_entry *to_do = events->queue; - event_handler *handler = to_do->handler; - void *data = to_do->data; - events->queue = to_do->next; - TRACE(trace_events, ("event issued at %ld - tag 0x%lx - time %ld, handler 0x%lx, data 0x%lx\n", - (long)event_time, - (long)to_do, - (long)to_do->time_of_event, - (long)handler, - (long)data)); - zfree(to_do); - /* Always re-compute the time to the next event so that HANDLER() - can safely insert new events into the queue. */ - update_time_from_event(events); - handler(data); - } - events->processing = 0; - - ASSERT(events->time_from_event > 0); - ASSERT(events->queue != NULL); /* always poll event */ -} - - -#endif /* _EVENTS_C_ */ |