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- /*
- * timer.cpp - Time Manager emulation
- *
- * Basilisk II (C) 1997-2001 Christian Bauer
- *
- * 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
- */
-
- /*
- * SEE ALSO
- * Inside Macintosh: Processes, chapter 3 "Time Manager"
- * Technote 1063: "Inside Macintosh: Processes: Time Manager Addenda"
- */
-
- #include <stdio.h>
-
- #include "sysdeps.h"
- #include "cpu_emulation.h"
- #include "main.h"
- #include "macos_util.h"
- #include "timer.h"
-
- #define DEBUG 0
- #include "debug.h"
-
-
- // Set this to 1 to enable TMQueue management (doesn't work)
- #define TM_QUEUE 0
-
-
- // Definitions for Time Manager
- enum { // TMTask struct
- tmAddr = 6,
- tmCount = 10,
- tmWakeUp = 14,
- tmReserved = 18
- };
-
-
- // Array of additional info for each installed TMTask
- struct TMDesc {
- uint32 task; // Mac address of associated TMTask
- tm_time_t wakeup; // Time this task is scheduled for execution
- bool in_use; // Flag: descriptor in use
- };
-
- const int NUM_DESCS = 64; // Maximum number of descriptors
- static TMDesc desc[NUM_DESCS];
-
-
- /*
- * Allocate descriptor for given TMTask in list
- */
-
- static int alloc_desc(uint32 tm)
- {
- // Search for first free descriptor
- for (int i=0; i<NUM_DESCS; i++)
- if (!desc[i].in_use) {
- desc[i].task = tm;
- desc[i].in_use = true;
- return i;
- }
- return -1;
- }
-
-
- /*
- * Free descriptor in list
- */
-
- inline static void free_desc(int i)
- {
- desc[i].in_use = false;
- }
-
-
- /*
- * Find descriptor associated with given TMTask
- */
-
- inline static int find_desc(uint32 tm)
- {
- for (int i=0; i<NUM_DESCS; i++)
- if (desc[i].in_use && desc[i].task == tm)
- return i;
- return -1;
- }
-
-
- /*
- * Enqueue task in Time Manager queue
- */
-
- static void enqueue_tm(uint32 tm)
- {
- #if TM_QUEUE
- uint32 tm_var = ReadMacInt32(0xb30);
- WriteMacInt32(tm + qLink, ReadMacInt32(tm_var));
- WriteMacInt32(tm_var, tm);
- #endif
- }
-
-
- /*
- * Remove task from Time Manager queue
- */
-
- static void dequeue_tm(uint32 tm)
- {
- #if TM_QUEUE
- uint32 p = ReadMacInt32(0xb30);
- while (p) {
- uint32 next = ReadMacInt32(p + qLink);
- if (next == tm) {
- WriteMacInt32(p + qLink, ReadMacInt32(next + qLink));
- return;
- }
- }
- #endif
- }
-
-
- /*
- * Initialize Time Manager
- */
-
- void TimerInit(void)
- {
- // Mark all descriptors as inactive
- for (int i=0; i<NUM_DESCS; i++)
- free_desc(i);
- }
-
-
- /*
- * Exit Time Manager
- */
-
- void TimerExit(void)
- {
- }
-
-
- /*
- * Emulator reset, remove all timer tasks
- */
-
- void TimerReset(void)
- {
- // Mark all descriptors as inactive
- for (int i=0; i<NUM_DESCS; i++)
- free_desc(i);
- }
-
-
- /*
- * Insert timer task
- */
-
- int16 InsTime(uint32 tm, uint16 trap)
- {
- D(bug("InsTime %08lx, trap %04x\n", tm, trap));
- WriteMacInt16(tm + qType, ReadMacInt16(tm + qType) & 0x1fff | (trap << 4) & 0x6000);
- if (find_desc(tm) >= 0)
- printf("WARNING: InsTime(): Task re-inserted\n");
- else {
- int i = alloc_desc(tm);
- if (i < 0)
- printf("FATAL: InsTime(): No free Time Manager descriptor\n");
- }
- return 0;
- }
-
-
- /*
- * Remove timer task
- */
-
- int16 RmvTime(uint32 tm)
- {
- D(bug("RmvTime %08lx\n", tm));
-
- // Find descriptor
- int i = find_desc(tm);
- if (i < 0) {
- printf("WARNING: RmvTime(%08x): Descriptor not found\n", tm);
- return 0;
- }
-
- // Task active?
- if (ReadMacInt16(tm + qType) & 0x8000) {
-
- // Yes, make task inactive and remove it from the Time Manager queue
- WriteMacInt16(tm + qType, ReadMacInt16(tm + qType) & 0x7fff);
- dequeue_tm(tm);
-
- // Compute remaining time
- tm_time_t remaining, current;
- timer_current_time(current);
- timer_sub_time(remaining, desc[i].wakeup, current);
- WriteMacInt32(tm + tmCount, timer_host2mac_time(remaining));
- } else
- WriteMacInt32(tm + tmCount, 0);
- D(bug(" tmCount %d\n", ReadMacInt32(tm + tmCount)));
-
- // Free descriptor
- free_desc(i);
- return 0;
- }
-
-
- /*
- * Start timer task
- */
-
- int16 PrimeTime(uint32 tm, int32 time)
- {
- D(bug("PrimeTime %08x, time %d\n", tm, time));
-
- // Find descriptor
- int i = find_desc(tm);
- if (i < 0) {
- printf("FATAL: PrimeTime(): Descriptor not found\n");
- return 0;
- }
-
- // Extended task?
- if (ReadMacInt16(tm + qType) & 0x4000) {
-
- // Convert delay time
- tm_time_t delay;
- timer_mac2host_time(delay, time);
-
- // Yes, tmWakeUp set?
- if (ReadMacInt32(tm + tmWakeUp)) {
-
- //!! PrimeTime(0) means continue previous delay
- // (save wakeup time in RmvTime?)
- if (time == 0) {
- printf("FATAL: Unsupported PrimeTime(0)\n");
- return 0;
- }
-
- // Yes, calculate wakeup time relative to last scheduled time
- tm_time_t wakeup;
- timer_add_time(wakeup, desc[i].wakeup, delay);
- desc[i].wakeup = wakeup;
-
- } else {
-
- // No, calculate wakeup time relative to current time
- tm_time_t now;
- timer_current_time(now);
- timer_add_time(desc[i].wakeup, now, delay);
- }
-
- // Set tmWakeUp to indicate that task was scheduled
- WriteMacInt32(tm + tmWakeUp, 0x12345678);
-
- } else {
-
- // Not extended task, calculate wakeup time relative to current time
- tm_time_t delay;
- timer_mac2host_time(delay, time);
- timer_current_time(desc[i].wakeup);
- timer_add_time(desc[i].wakeup, desc[i].wakeup, delay);
- }
-
- // Make task active and enqueue it in the Time Manager queue
- WriteMacInt16(tm + qType, ReadMacInt16(tm + qType) | 0x8000);
- enqueue_tm(tm);
- return 0;
- }
-
-
- /*
- * Timer interrupt function (executed as part of 60Hz interrupt)
- */
-
- void TimerInterrupt(void)
- {
- // Look for active TMTasks that have expired
- tm_time_t now;
- timer_current_time(now);
- for (int i=0; i<NUM_DESCS; i++)
- if (desc[i].in_use) {
- uint32 tm = desc[i].task;
- if ((ReadMacInt16(tm + qType) & 0x8000) && timer_cmp_time(desc[i].wakeup, now) < 0) {
-
- // Found one, mark as inactive and remove it from the Time Manager queue
- WriteMacInt16(tm + qType, ReadMacInt16(tm + qType) & 0x7fff);
- dequeue_tm(tm);
-
- // Call timer function
- uint32 addr = ReadMacInt32(tm + tmAddr);
- if (addr) {
- D(bug("Calling TimeTask %08lx, addr %08lx\n", tm, addr));
- M68kRegisters r;
- r.a[0] = addr;
- r.a[1] = tm;
- Execute68k(addr, &r);
- }
- }
- }
- }
-