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jace
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Switched synchronization to use a semaphore when reconfiguring memory banks

This commit is contained in:
Brendan Robert 2015-03-29 00:27:30 -05:00
parent 4c073cca6a
commit 98fd203305
1 changed files with 33 additions and 20 deletions
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53
src/main/java/jace/apple2e/RAM128k.java
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@ -26,15 +26,19 @@ import jace.core.RAM;
import jace.state.Stateful;
import java.io.IOException;
import java.io.InputStream;
import java.util.concurrent.Semaphore;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Implementation of a 128k memory space and the MMU found in an Apple //e. The
* MMU behavior is mimicked by configureActiveMemory.
*
* @author Brendan Robert (BLuRry) brendan.robert@gmail.com
* @author Brendan Robert (BLuRry) brendan.robert@gmail.com
*/
@Stateful
abstract public class RAM128k extends RAM {
@Stateful
public PagedMemory mainMemory;
@Stateful
@ -62,7 +66,7 @@ abstract public class RAM128k extends RAM {
}
initMemoryPattern(mainMemory);
}
public final void initMemoryPattern(PagedMemory mem) {
// Format memory with FF FF 00 00 pattern
for (int i = 0; i < 0x0100; i++) {
@ -72,18 +76,21 @@ abstract public class RAM128k extends RAM {
}
}
}
private final Semaphore configurationSemaphone = new Semaphore(1, true);
/**
*
*/
@Override
public void configureActiveMemory() {
log("MMU Switches");
synchronized (this) {
try {
log("MMU Switches");
configurationSemaphone.acquire();
// First off, set up read/write for main memory (might get changed later on)
activeRead.fillBanks(SoftSwitches.RAMRD.getState() ? getAuxMemory() : mainMemory);
activeWrite.fillBanks(SoftSwitches.RAMWRT.getState() ? getAuxMemory() : mainMemory);
// Handle language card softswitches
activeRead.fillBanks(rom);
//activeRead.fillBanks(cPageRom);
@ -103,7 +110,7 @@ abstract public class RAM128k extends RAM {
}
}
}
if (SoftSwitches.LCWRITE.getState()) {
if (!SoftSwitches.AUXZP.getState()) {
activeWrite.fillBanks(languageCard);
@ -122,7 +129,7 @@ abstract public class RAM128k extends RAM {
activeWrite.set(i, null);
}
}
// Handle 80STORE logic for bankswitching video ram
if (SoftSwitches._80STORE.isOn()) {
activeRead.setBanks(0x04, 0x04, 0x04,
@ -136,7 +143,7 @@ abstract public class RAM128k extends RAM {
SoftSwitches.PAGE2.isOn() ? getAuxMemory() : mainMemory);
}
}
// Handle zero-page bankswitching
if (SoftSwitches.AUXZP.getState()) {
// Aux pages 0 and 1
@ -147,13 +154,13 @@ abstract public class RAM128k extends RAM {
activeRead.setBanks(0, 2, 0, mainMemory);
activeWrite.setBanks(0, 2, 0, mainMemory);
}
/*
INTCXROM SLOTC3ROM C1,C2,C4-CF C3
0 0 slot rom
0 1 slot slot
1 - rom rom
*/
INTCXROM SLOTC3ROM C1,C2,C4-CF C3
0 0 slot rom
0 1 slot slot
1 - rom rom
*/
if (SoftSwitches.CXROM.getState()) {
// Enable C1-CF to point to rom
activeRead.setBanks(0, 0x0F, 0x0C1, cPageRom);
@ -168,7 +175,7 @@ abstract public class RAM128k extends RAM {
activeRead.set(i, blank.get(0));
}
} else {
getCard(getActiveSlot()).ifPresent(c -> activeRead.setBanks(0,8,0x0c8, c.getC8Rom()));
getCard(getActiveSlot()).ifPresent(c -> activeRead.setBanks(0, 8, 0x0c8, c.getC8Rom()));
}
if (SoftSwitches.SLOTC3ROM.isOff()) {
// Enable C3 to point to internal ROM
@ -179,9 +186,12 @@ abstract public class RAM128k extends RAM {
activeRead.setBanks(7, 8, 0x0C8, cPageRom);
}
}
// All ROM reads not intecepted will return 0xFF! (TODO: floating bus)
activeRead.set(0x0c0, blank.get(0));
configurationSemaphone.release();
} catch (InterruptedException ex) {
Logger.getLogger(RAM128k.class.getName()).log(Level.SEVERE, null, ex);
}
// All ROM reads not intecepted will return 0xFF! (TODO: floating bus)
activeRead.set(0x0c0, blank.get(0));
}
public void log(String message) {
@ -234,10 +244,13 @@ abstract public class RAM128k extends RAM {
}
abstract public PagedMemory getAuxVideoMemory();
abstract public PagedMemory getAuxMemory();
abstract public PagedMemory getAuxLanguageCard();
abstract public PagedMemory getAuxLanguageCard2();
/**
* @return the languageCard
*/
@ -278,4 +291,4 @@ abstract public class RAM128k extends RAM {
cards = currentMemory.cards;
activeSlot = currentMemory.activeSlot;
}
}
}