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/* |
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* timer.cpp - Time Manager emulation |
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* |
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* Basilisk II (C) 1997-1999 Christian Bauer |
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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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/* |
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* SEE ALSO |
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* Inside Macintosh: Processes, chapter 3 "Time Manager" |
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* Technote 1063: "Inside Macintosh: Processes: Time Manager Addenda" |
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*/ |
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|
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#include <stdio.h> |
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|
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#include "sysdeps.h" |
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#include "cpu_emulation.h" |
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#include "main.h" |
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#include "macos_util.h" |
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#include "timer.h" |
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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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// Set this to 1 to enable TMQueue management (doesn't work) |
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#define TM_QUEUE 0 |
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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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|
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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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* 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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|
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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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} |
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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(tm + qType, ReadMacInt16(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 (ReadMacInt16(tm + qType) & 0x8000) { |
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|
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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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|
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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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|
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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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|
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/* |
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* Start timer task |
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*/ |
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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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|
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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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|
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// Extended task? |
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if (ReadMacInt16(tm + qType) & 0x4000) { |
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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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|
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// Yes, tmWakeUp set? |
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if (ReadMacInt32(tm + tmWakeUp)) { |
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|
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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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|
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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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|
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} else { |
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|
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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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|
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// Set tmWakeUp to indicate that task was scheduled |
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WriteMacInt32(tm + tmWakeUp, 0x12345678); |
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|
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} else { |
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|
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// Not extended task, calculate wakeup time relative to current time |
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tm_time_t delay; |
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timer_mac2host_time(delay, time); |
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timer_current_time(desc[i].wakeup); |
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timer_add_time(desc[i].wakeup, desc[i].wakeup, delay); |
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} |
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|
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// Make task active and enqueue it in the Time Manager queue |
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WriteMacInt16(tm + qType, ReadMacInt16(tm + qType) | 0x8000); |
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enqueue_tm(tm); |
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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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* Timer interrupt function (executed as part of 60Hz interrupt) |
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*/ |
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|
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void TimerInterrupt(void) |
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{ |
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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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|
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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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|
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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(addr, &r); |
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} |
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} |
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} |
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} |
