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/*
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* timer.cpp - Time Manager emulation
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*
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* SheepShaver (C) 1997-2002 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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* TODO: Prime(0)
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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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#define DEBUG 0
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#include "debug.h"
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#if __BEOS__
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#define PRECISE_TIMING 1
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#else
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#define PRECISE_TIMING 0
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#endif
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#define TM_QUEUE 0 // Enable TMQueue management (doesn't work)
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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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// 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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const int NUM_DESCS = 64; // Maximum number of descriptors
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static TMDesc desc[NUM_DESCS];
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#if PRECISE_TIMING
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static thread_id timer_thread = -1;
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static bool thread_active = true;
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static volatile tm_time_t wakeup_time = 0x7fffffffffffffff;
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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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/*
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* Allocate descriptor for given TMTask in list
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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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* Free descriptor in list
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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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* Find descriptor associated with given TMTask
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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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* Enqueue task in Time Manager queue
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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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* Remove task from Time Manager queue
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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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* Initialize Time Manager
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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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#if PRECISE_TIMING
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// Start timer thread
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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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}
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/*
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* Exit Time Manager
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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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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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}
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#endif
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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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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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* Insert timer task
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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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* Remove timer task
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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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// 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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// Task active?
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#if PRECISE_TIMING
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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 (ReadMacInt16(tm + qType) & 0x8000) {
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// Yes, make task inactive and remove it from the Time Manager queue
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WriteMacInt16(tm + qType, ReadMacInt16(tm + qType) & 0x7fff);
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dequeue_tm(tm);
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#if PRECISE_TIMING
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// Look for next task to be called and set wakeup_time
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wakeup_time = 0x7fffffffffffffff;
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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 (desc[j].wakeup < wakeup_time)
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wakeup_time = desc[j].wakeup;
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}
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#endif
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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));
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} else
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WriteMacInt32(tm + tmCount, 0);
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D(bug(" tmCount %ld\n", ReadMacInt32(tm + tmCount)));
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#if PRECISE_TIMING
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release_sem(wakeup_time_sem);
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thread_info info;
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do {
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resume_thread(timer_thread); // This will unblock the thread
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get_thread_info(timer_thread, &info);
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} while (info.state == B_THREAD_SUSPENDED); // Sometimes, resume_thread() doesn't work (BeOS bug?)
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#endif
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// Free descriptor
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free_desc(i);
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return 0;
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}
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/*
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* Start timer task
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*/
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int16 PrimeTime(uint32 tm, int32 time)
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{
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D(bug("PrimeTime %08lx, time %ld\n", tm, time));
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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("FATAL: PrimeTime(): Descriptor not found\n");
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return 0;
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}
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// Convert delay time
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tm_time_t delay;
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timer_mac2host_time(delay, time);
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// Extended task?
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if (ReadMacInt16(tm + qType) & 0x4000) {
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// Yes, tmWakeUp set?
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if (ReadMacInt32(tm + tmWakeUp)) {
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//!! PrimeTime(0) means continue previous delay
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// (save wakeup time in RmvTime?)
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if (time == 0) {
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printf("FATAL: Unsupported PrimeTime(0)\n");
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return 0;
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}
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// Yes, calculate wakeup time relative to last scheduled time
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tm_time_t wakeup;
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timer_add_time(wakeup, desc[i].wakeup, delay);
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desc[i].wakeup = wakeup;
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} else {
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// No, calculate wakeup time relative to current time
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tm_time_t now;
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timer_current_time(now);
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timer_add_time(desc[i].wakeup, now, delay);
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}
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// Set tmWakeUp to indicate that task was scheduled
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WriteMacInt32(tm + tmWakeUp, 0x12345678);
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} else {
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// Not extended task, calculate wakeup time relative to current time
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tm_time_t now;
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timer_current_time(now);
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timer_add_time(desc[i].wakeup, now, delay);
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}
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// Make task active and enqueue it in the Time Manager queue
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#if PRECISE_TIMING
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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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WriteMacInt16(tm + qType, ReadMacInt16(tm + qType) | 0x8000);
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enqueue_tm(tm);
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#if PRECISE_TIMING
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// Look for next task to be called and set wakeup_time
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wakeup_time = 0x7fffffffffffffff;
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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 (desc[j].wakeup < wakeup_time)
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wakeup_time = desc[j].wakeup;
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}
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release_sem(wakeup_time_sem);
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thread_info info;
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do {
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resume_thread(timer_thread); // This will unblock the thread
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get_thread_info(timer_thread, &info);
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} while (info.state == B_THREAD_SUSPENDED); // Sometimes, resume_thread() doesn't work (BeOS bug?)
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#endif
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return 0;
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}
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#if PRECISE_TIMING
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/*
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* Time Manager thread
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*/
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static int32 timer_func(void *arg)
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{
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while (thread_active) {
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// Wait until time specified by wakeup_time
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snooze_until(wakeup_time, B_SYSTEM_TIMEBASE);
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while (acquire_sem(wakeup_time_sem) == B_INTERRUPTED) ;
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if (wakeup_time < system_time()) {
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// Timer expired, trigger interrupt
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wakeup_time = 0x7fffffffffffffff;
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SetInterruptFlag(INTFLAG_TIMER);
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TriggerInterrupt();
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}
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release_sem(wakeup_time_sem);
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}
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return 0;
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}
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#endif
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/*
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* Timer interrupt function (executed as part of 60Hz interrupt)
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*/
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void TimerInterrupt(void)
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{
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// D(bug("TimerIRQ\n"));
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// Look for active TMTasks that have expired
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tm_time_t now;
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timer_current_time(now);
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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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uint32 tm = desc[i].task;
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if ((ReadMacInt16(tm + qType) & 0x8000) && timer_cmp_time(desc[i].wakeup, now) <= 0) {
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// Found one, mark as inactive and remove it from the Time Manager queue
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WriteMacInt16(tm + qType, ReadMacInt16(tm + qType) & 0x7fff);
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dequeue_tm(tm);
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// Call timer function
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uint32 addr = ReadMacInt32(tm + tmAddr);
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if (addr) {
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D(bug("Calling TimeTask %08lx, addr %08lx\n", tm, addr));
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M68kRegisters r;
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r.a[0] = addr;
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r.a[1] = tm;
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Execute68k(r.a[0], &r);
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D(bug(" returned from TimeTask\n"));
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}
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}
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}
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#if PRECISE_TIMING
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// Look for next task to be called and set wakeup_time
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while (acquire_sem(wakeup_time_sem) == B_INTERRUPTED) ;
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suspend_thread(timer_thread);
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wakeup_time = 0x7fffffffffffffff;
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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 (desc[j].wakeup < wakeup_time)
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wakeup_time = desc[j].wakeup;
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}
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release_sem(wakeup_time_sem);
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thread_info info;
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do {
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resume_thread(timer_thread); // This will unblock the thread
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get_thread_info(timer_thread, &info);
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} while (info.state == B_THREAD_SUSPENDED); // Sometimes, resume_thread() doesn't work (BeOS bug?)
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#endif
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}
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