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/* |
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* timer.cpp - Time Manager emulation |
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* |
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* SheepShaver (C) 1997-2008 Christian Bauer and Marc Hellwig |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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|
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#include "sysdeps.h" |
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#include "timer.h" |
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#include "macos_util.h" |
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#include "main.h" |
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#include "cpu_emulation.h" |
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|
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#ifdef PRECISE_TIMING_POSIX |
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#include <pthread.h> |
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#include <semaphore.h> |
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#endif |
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|
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#define DEBUG 0 |
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#include "debug.h" |
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|
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|
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#define TM_QUEUE 0 // Enable TMQueue management (doesn't work) |
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|
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|
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// Definitions for Time Manager |
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enum { // TMTask struct |
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tmAddr = 6, |
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tmCount = 10, |
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tmWakeUp = 14, |
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tmReserved = 18 |
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}; |
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|
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|
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// Array of additional info for each installed TMTask |
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struct TMDesc { |
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uint32 task; // Mac address of associated TMTask |
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tm_time_t wakeup; // Time this task is scheduled for execution |
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bool in_use; // Flag: descriptor in use |
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}; |
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|
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const int NUM_DESCS = 64; // Maximum number of descriptors |
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static TMDesc desc[NUM_DESCS]; |
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|
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#if PRECISE_TIMING |
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#ifdef PRECISE_TIMING_BEOS |
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static thread_id timer_thread = -1; |
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static bool thread_active = true; |
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static const tm_time_t wakeup_time_max = 0x7fffffffffffffff; |
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static volatile tm_time_t wakeup_time = wakeup_time_max; |
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static sem_id wakeup_time_sem = -1; |
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static int32 timer_func(void *arg); |
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#endif |
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#ifdef PRECISE_TIMING_POSIX |
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static pthread_t timer_thread; |
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static bool timer_thread_active = false; |
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static volatile bool timer_thread_cancel = false; |
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static tm_time_t wakeup_time_max = { 0x7fffffff, 999999999 }; |
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static tm_time_t wakeup_time = wakeup_time_max; |
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static pthread_mutex_t wakeup_time_lock = PTHREAD_MUTEX_INITIALIZER; |
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static void *timer_func(void *arg); |
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#endif |
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#endif |
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|
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|
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/* |
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* Allocate descriptor for given TMTask in list |
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*/ |
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|
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static int alloc_desc(uint32 tm) |
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{ |
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// Search for first free descriptor |
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for (int i=0; i<NUM_DESCS; i++) |
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if (!desc[i].in_use) { |
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desc[i].task = tm; |
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desc[i].in_use = true; |
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return i; |
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} |
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return -1; |
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} |
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|
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|
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/* |
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* Free descriptor in list |
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*/ |
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|
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inline static void free_desc(int i) |
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{ |
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desc[i].in_use = false; |
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} |
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|
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|
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/* |
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* Find descriptor associated with given TMTask |
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*/ |
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|
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inline static int find_desc(uint32 tm) |
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{ |
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for (int i=0; i<NUM_DESCS; i++) |
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if (desc[i].in_use && desc[i].task == tm) |
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return i; |
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return -1; |
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} |
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|
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|
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/* |
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* Enqueue task in Time Manager queue |
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*/ |
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|
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static void enqueue_tm(uint32 tm) |
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{ |
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#if TM_QUEUE |
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uint32 tm_var = ReadMacInt32(0xb30); |
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WriteMacInt32(tm + qLink, ReadMacInt32(tm_var)); |
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WriteMacInt32(tm_var, tm); |
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#endif |
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} |
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|
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|
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/* |
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* Remove task from Time Manager queue |
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*/ |
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|
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static void dequeue_tm(uint32 tm) |
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{ |
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#if TM_QUEUE |
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uint32 p = ReadMacInt32(0xb30); |
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while (p) { |
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uint32 next = ReadMacInt32(p + qLink); |
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if (next == tm) { |
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WriteMacInt32(p + qLink, ReadMacInt32(next + qLink)); |
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return; |
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} |
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} |
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#endif |
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} |
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|
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|
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/* |
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* Timer thread operations |
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*/ |
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|
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#ifdef PRECISE_TIMING_POSIX |
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const int SIGSUSPEND = SIGRTMIN + 6; |
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const int SIGRESUME = SIGRTMIN + 7; |
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static struct sigaction sigsuspend_action; |
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static struct sigaction sigresume_action; |
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|
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static int suspend_count = 0; |
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static pthread_mutex_t suspend_count_lock = PTHREAD_MUTEX_INITIALIZER; |
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static sem_t suspend_ack_sem; |
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static sigset_t suspend_handler_mask; |
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|
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// Signal handler for suspended thread |
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static void sigsuspend_handler(int sig) |
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{ |
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sem_post(&suspend_ack_sem); |
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sigsuspend(&suspend_handler_mask); |
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} |
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|
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// Signal handler for resumed thread |
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static void sigresume_handler(int sig) |
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{ |
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/* simply trigger a signal to stop clock_nanosleep() */ |
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} |
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|
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// Initialize timer thread |
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static bool timer_thread_init(void) |
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{ |
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// Install suspend signal handler |
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sigemptyset(&sigsuspend_action.sa_mask); |
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sigaddset(&sigsuspend_action.sa_mask, SIGRESUME); |
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sigsuspend_action.sa_handler = sigsuspend_handler; |
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sigsuspend_action.sa_flags = SA_RESTART; |
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#ifdef HAVE_SIGNAL_SA_RESTORER |
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sigsuspend_action.sa_restorer = NULL; |
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#endif |
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if (sigaction(SIGSUSPEND, &sigsuspend_action, NULL) < 0) |
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return false; |
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|
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// Install resume signal handler |
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sigemptyset(&sigresume_action.sa_mask); |
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sigresume_action.sa_handler = sigresume_handler; |
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sigresume_action.sa_flags = SA_RESTART; |
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#ifdef HAVE_SIGNAL_SA_RESTORER |
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sigresume_action.sa_restorer = NULL; |
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#endif |
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if (sigaction(SIGRESUME, &sigresume_action, NULL) < 0) |
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return false; |
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|
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// Initialize semaphore |
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if (sem_init(&suspend_ack_sem, 0, 0) < 0) |
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return false; |
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|
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// Initialize suspend_handler_mask, it excludes SIGRESUME |
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if (sigfillset(&suspend_handler_mask) != 0) |
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return false; |
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if (sigdelset(&suspend_handler_mask, SIGRESUME) != 0) |
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return false; |
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|
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// Create thread in running state |
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suspend_count = 0; |
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return (pthread_create(&timer_thread, NULL, timer_func, NULL) == 0); |
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} |
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|
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// Kill timer thread |
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static void timer_thread_kill(void) |
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{ |
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timer_thread_cancel = true; |
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#ifdef HAVE_PTHREAD_CANCEL |
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pthread_cancel(timer_thread); |
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#endif |
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pthread_join(timer_thread, NULL); |
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} |
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|
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// Suspend timer thread |
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static void timer_thread_suspend(void) |
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{ |
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pthread_mutex_lock(&suspend_count_lock); |
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if (suspend_count == 0) { |
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suspend_count ++; |
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if (pthread_kill(timer_thread, SIGSUSPEND) == 0) |
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sem_wait(&suspend_ack_sem); |
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} |
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pthread_mutex_unlock(&suspend_count_lock); |
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} |
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|
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// Resume timer thread |
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static void timer_thread_resume(void) |
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{ |
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pthread_mutex_lock(&suspend_count_lock); |
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assert(suspend_count > 0); |
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if (suspend_count == 1) { |
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suspend_count = 0; |
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pthread_kill(timer_thread, SIGRESUME); |
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} |
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pthread_mutex_unlock(&suspend_count_lock); |
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} |
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#endif |
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|
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|
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/* |
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* Initialize Time Manager |
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*/ |
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|
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void TimerInit(void) |
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{ |
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// Mark all descriptors as inactive |
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for (int i=0; i<NUM_DESCS; i++) |
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free_desc(i); |
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|
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#if PRECISE_TIMING |
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// Start timer thread |
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#ifdef PRECISE_TIMING_BEOS |
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wakeup_time_sem = create_sem(1, "Wakeup Time"); |
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timer_thread = spawn_thread(timer_func, "Time Manager", B_REAL_TIME_PRIORITY, NULL); |
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resume_thread(timer_thread); |
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#endif |
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#ifdef PRECISE_TIMING_POSIX |
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timer_thread_active = timer_thread_init(); |
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#endif |
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#endif |
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} |
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|
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|
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/* |
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* Exit Time Manager |
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*/ |
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|
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void TimerExit(void) |
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{ |
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#if PRECISE_TIMING |
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// Quit timer thread |
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if (timer_thread > 0) { |
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#ifdef PRECISE_TIMING_BEOS |
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status_t l; |
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thread_active = false; |
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suspend_thread(timer_thread); |
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resume_thread(timer_thread); |
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wait_for_thread(timer_thread, &l); |
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delete_sem(wakeup_time_sem); |
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#endif |
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#ifdef PRECISE_TIMING_POSIX |
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timer_thread_kill(); |
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#endif |
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} |
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#endif |
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} |
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|
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|
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/* |
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* Emulator reset, remove all timer tasks |
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*/ |
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|
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void TimerReset(void) |
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{ |
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// Mark all descriptors as inactive |
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for (int i=0; i<NUM_DESCS; i++) |
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free_desc(i); |
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} |
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|
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|
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/* |
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* Insert timer task |
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*/ |
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|
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int16 InsTime(uint32 tm, uint16 trap) |
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{ |
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D(bug("InsTime %08lx, trap %04x\n", tm, trap)); |
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WriteMacInt16((uint32)tm + qType, ReadMacInt16((uint32)tm + qType) & 0x1fff | (trap << 4) & 0x6000); |
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if (find_desc(tm) >= 0) |
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printf("WARNING: InsTime(): Task re-inserted\n"); |
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else { |
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int i = alloc_desc(tm); |
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if (i < 0) |
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printf("FATAL: InsTime(): No free Time Manager descriptor\n"); |
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} |
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return 0; |
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} |
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|
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|
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/* |
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* Remove timer task |
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*/ |
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|
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int16 RmvTime(uint32 tm) |
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{ |
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D(bug("RmvTime %08lx\n", tm)); |
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|
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// Find descriptor |
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int i = find_desc(tm); |
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if (i < 0) { |
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printf("WARNING: RmvTime(%08lx): Descriptor not found\n", tm); |
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return 0; |
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} |
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|
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// Task active? |
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#if PRECISE_TIMING_BEOS |
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while (acquire_sem(wakeup_time_sem) == B_INTERRUPTED) ; |
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suspend_thread(timer_thread); |
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#endif |
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#if PRECISE_TIMING_POSIX |
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timer_thread_suspend(); |
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pthread_mutex_lock(&wakeup_time_lock); |
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#endif |
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if (ReadMacInt16(tm + qType) & 0x8000) { |
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|
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// Yes, make task inactive and remove it from the Time Manager queue |
362 |
WriteMacInt16(tm + qType, ReadMacInt16(tm + qType) & 0x7fff); |
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dequeue_tm(tm); |
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#if PRECISE_TIMING |
365 |
// Look for next task to be called and set wakeup_time |
366 |
wakeup_time = wakeup_time_max; |
367 |
for (int j=0; j<NUM_DESCS; j++) { |
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if (desc[j].in_use && (ReadMacInt16(desc[j].task + qType) & 0x8000)) |
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if (timer_cmp_time(desc[j].wakeup, wakeup_time) < 0) |
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wakeup_time = desc[j].wakeup; |
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} |
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#endif |
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|
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// Compute remaining time |
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tm_time_t remaining, current; |
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timer_current_time(current); |
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timer_sub_time(remaining, desc[i].wakeup, current); |
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WriteMacInt32(tm + tmCount, timer_host2mac_time(remaining)); |
379 |
} else |
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WriteMacInt32(tm + tmCount, 0); |
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D(bug(" tmCount %ld\n", ReadMacInt32(tm + tmCount))); |
382 |
#if PRECISE_TIMING_BEOS |
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release_sem(wakeup_time_sem); |
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thread_info info; |
385 |
do { |
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resume_thread(timer_thread); // This will unblock the thread |
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get_thread_info(timer_thread, &info); |
388 |
} while (info.state == B_THREAD_SUSPENDED); // Sometimes, resume_thread() doesn't work (BeOS bug?) |
389 |
#endif |
390 |
#if PRECISE_TIMING_POSIX |
391 |
pthread_mutex_unlock(&wakeup_time_lock); |
392 |
timer_thread_resume(); |
393 |
assert(suspend_count == 0); |
394 |
#endif |
395 |
|
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// Free descriptor |
397 |
free_desc(i); |
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return 0; |
399 |
} |
400 |
|
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|
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/* |
403 |
* Start timer task |
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*/ |
405 |
|
406 |
int16 PrimeTime(uint32 tm, int32 time) |
407 |
{ |
408 |
D(bug("PrimeTime %08lx, time %ld\n", tm, time)); |
409 |
|
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// Find descriptor |
411 |
int i = find_desc(tm); |
412 |
if (i < 0) { |
413 |
printf("FATAL: PrimeTime(): Descriptor not found\n"); |
414 |
return 0; |
415 |
} |
416 |
|
417 |
// Convert delay time |
418 |
tm_time_t delay; |
419 |
timer_mac2host_time(delay, time); |
420 |
|
421 |
// Extended task? |
422 |
if (ReadMacInt16(tm + qType) & 0x4000) { |
423 |
|
424 |
// Yes, tmWakeUp set? |
425 |
if (ReadMacInt32(tm + tmWakeUp)) { |
426 |
|
427 |
// PrimeTime(0) can either mean (a) "the task runs as soon as interrupts are enabled" |
428 |
// or (b) "continue previous delay" if an expired task was stopped via RmvTime() and |
429 |
// then re-installed using InsXTime(). Since tmWakeUp was set, this is case (b). |
430 |
// The remaining time was saved in tmCount by RmvTime(). |
431 |
if (time == 0) { |
432 |
timer_mac2host_time(delay, ReadMacInt16(tm + tmCount)); |
433 |
} |
434 |
|
435 |
// Yes, calculate wakeup time relative to last scheduled time |
436 |
tm_time_t wakeup; |
437 |
timer_add_time(wakeup, desc[i].wakeup, delay); |
438 |
desc[i].wakeup = wakeup; |
439 |
|
440 |
} else { |
441 |
|
442 |
// No, calculate wakeup time relative to current time |
443 |
tm_time_t now; |
444 |
timer_current_time(now); |
445 |
timer_add_time(desc[i].wakeup, now, delay); |
446 |
} |
447 |
|
448 |
// Set tmWakeUp to indicate that task was scheduled |
449 |
WriteMacInt32(tm + tmWakeUp, 0x12345678); |
450 |
|
451 |
} else { |
452 |
|
453 |
// Not extended task, calculate wakeup time relative to current time |
454 |
tm_time_t now; |
455 |
timer_current_time(now); |
456 |
timer_add_time(desc[i].wakeup, now, delay); |
457 |
} |
458 |
|
459 |
// Make task active and enqueue it in the Time Manager queue |
460 |
#if PRECISE_TIMING_BEOS |
461 |
while (acquire_sem(wakeup_time_sem) == B_INTERRUPTED) ; |
462 |
suspend_thread(timer_thread); |
463 |
#endif |
464 |
#if PRECISE_TIMING_POSIX |
465 |
timer_thread_suspend(); |
466 |
pthread_mutex_lock(&wakeup_time_lock); |
467 |
#endif |
468 |
WriteMacInt16(tm + qType, ReadMacInt16(tm + qType) | 0x8000); |
469 |
enqueue_tm(tm); |
470 |
#if PRECISE_TIMING |
471 |
// Look for next task to be called and set wakeup_time |
472 |
wakeup_time = wakeup_time_max; |
473 |
for (int j=0; j<NUM_DESCS; j++) { |
474 |
if (desc[j].in_use && (ReadMacInt16(desc[j].task + qType) & 0x8000)) |
475 |
if (timer_cmp_time(desc[j].wakeup, wakeup_time) < 0) |
476 |
wakeup_time = desc[j].wakeup; |
477 |
} |
478 |
#ifdef PRECISE_TIMING_BEOS |
479 |
release_sem(wakeup_time_sem); |
480 |
thread_info info; |
481 |
do { |
482 |
resume_thread(timer_thread); // This will unblock the thread |
483 |
get_thread_info(timer_thread, &info); |
484 |
} while (info.state == B_THREAD_SUSPENDED); // Sometimes, resume_thread() doesn't work (BeOS bug?) |
485 |
#endif |
486 |
#ifdef PRECISE_TIMING_POSIX |
487 |
pthread_mutex_unlock(&wakeup_time_lock); |
488 |
timer_thread_resume(); |
489 |
assert(suspend_count == 0); |
490 |
#endif |
491 |
#endif |
492 |
return 0; |
493 |
} |
494 |
|
495 |
|
496 |
/* |
497 |
* Time Manager thread |
498 |
*/ |
499 |
|
500 |
#ifdef PRECISE_TIMING_BEOS |
501 |
static int32 timer_func(void *arg) |
502 |
{ |
503 |
while (thread_active) { |
504 |
|
505 |
// Wait until time specified by wakeup_time |
506 |
snooze_until(wakeup_time, B_SYSTEM_TIMEBASE); |
507 |
|
508 |
while (acquire_sem(wakeup_time_sem) == B_INTERRUPTED) ; |
509 |
if (wakeup_time < system_time()) { |
510 |
|
511 |
// Timer expired, trigger interrupt |
512 |
wakeup_time = 0x7fffffffffffffff; |
513 |
SetInterruptFlag(INTFLAG_TIMER); |
514 |
TriggerInterrupt(); |
515 |
} |
516 |
release_sem(wakeup_time_sem); |
517 |
} |
518 |
return 0; |
519 |
} |
520 |
#endif |
521 |
|
522 |
#ifdef PRECISE_TIMING_POSIX |
523 |
static void *timer_func(void *arg) |
524 |
{ |
525 |
while (!timer_thread_cancel) { |
526 |
|
527 |
// Wait until time specified by wakeup_time |
528 |
clock_nanosleep(CLOCK_REALTIME, TIMER_ABSTIME, &wakeup_time, NULL); |
529 |
|
530 |
tm_time_t system_time; |
531 |
timer_current_time(system_time); |
532 |
if (timer_cmp_time(wakeup_time, system_time) < 0) { |
533 |
|
534 |
// Timer expired, trigger interrupt |
535 |
pthread_mutex_lock(&wakeup_time_lock); |
536 |
wakeup_time = wakeup_time_max; |
537 |
pthread_mutex_unlock(&wakeup_time_lock); |
538 |
SetInterruptFlag(INTFLAG_TIMER); |
539 |
TriggerInterrupt(); |
540 |
} |
541 |
} |
542 |
return NULL; |
543 |
} |
544 |
#endif |
545 |
|
546 |
|
547 |
/* |
548 |
* Timer interrupt function (executed as part of 60Hz interrupt) |
549 |
*/ |
550 |
|
551 |
void TimerInterrupt(void) |
552 |
{ |
553 |
// D(bug("TimerIRQ\n")); |
554 |
|
555 |
// Look for active TMTasks that have expired |
556 |
tm_time_t now; |
557 |
timer_current_time(now); |
558 |
for (int i=0; i<NUM_DESCS; i++) |
559 |
if (desc[i].in_use) { |
560 |
uint32 tm = desc[i].task; |
561 |
if ((ReadMacInt16(tm + qType) & 0x8000) && timer_cmp_time(desc[i].wakeup, now) <= 0) { |
562 |
|
563 |
// Found one, mark as inactive and remove it from the Time Manager queue |
564 |
WriteMacInt16(tm + qType, ReadMacInt16(tm + qType) & 0x7fff); |
565 |
dequeue_tm(tm); |
566 |
|
567 |
// Call timer function |
568 |
uint32 addr = ReadMacInt32(tm + tmAddr); |
569 |
if (addr) { |
570 |
D(bug("Calling TimeTask %08lx, addr %08lx\n", tm, addr)); |
571 |
M68kRegisters r; |
572 |
r.a[0] = addr; |
573 |
r.a[1] = tm; |
574 |
Execute68k(r.a[0], &r); |
575 |
D(bug(" returned from TimeTask\n")); |
576 |
} |
577 |
} |
578 |
} |
579 |
|
580 |
#if PRECISE_TIMING |
581 |
// Look for next task to be called and set wakeup_time |
582 |
#if PRECISE_TIMING_BEOS |
583 |
while (acquire_sem(wakeup_time_sem) == B_INTERRUPTED) ; |
584 |
suspend_thread(timer_thread); |
585 |
#endif |
586 |
#if PRECISE_TIMING_POSIX |
587 |
timer_thread_suspend(); |
588 |
pthread_mutex_lock(&wakeup_time_lock); |
589 |
#endif |
590 |
wakeup_time = wakeup_time_max; |
591 |
for (int j=0; j<NUM_DESCS; j++) { |
592 |
if (desc[j].in_use && (ReadMacInt16(desc[j].task + qType) & 0x8000)) |
593 |
if (timer_cmp_time(desc[j].wakeup, wakeup_time) < 0) |
594 |
wakeup_time = desc[j].wakeup; |
595 |
} |
596 |
#if PRECISE_TIMING_BEOS |
597 |
release_sem(wakeup_time_sem); |
598 |
thread_info info; |
599 |
do { |
600 |
resume_thread(timer_thread); // This will unblock the thread |
601 |
get_thread_info(timer_thread, &info); |
602 |
} while (info.state == B_THREAD_SUSPENDED); // Sometimes, resume_thread() doesn't work (BeOS bug?) |
603 |
#endif |
604 |
#if PRECISE_TIMING_POSIX |
605 |
pthread_mutex_unlock(&wakeup_time_lock); |
606 |
timer_thread_resume(); |
607 |
assert(suspend_count == 0); |
608 |
#endif |
609 |
#endif |
610 |
} |