simon987/Much-Assembly-Required
1
0
Fork 0
mirror of https://github.com/simon987/Much-Assembly-Required.git synced 2025-10-31 16:26:51 +00:00
Code Issues Projects Releases Wiki Activity

Unhardcoded codeSegmentOffset and the hardware offset.

Browse Source 
Changed Interrupt(int hw, int offset, boolean retry)
to	interrupt(boolean hw, int offset).
Removed no operand overload of int.
Added org_hwIVoddset to config.properties
This commit is contained in:
Brent O'Neil 2017-12-31 13:19:04 +11:00
parent 3db05478c1
commit ab5810c585
4 changed files with 17 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
Server/src/main/java/net/simon987/server/assembly/CPU.java
View File

@ -47,6 +47,11 @@ public class CPU implements JSONSerialisable {
* executed at this address each tick. Defaults to org_offset@config.properties * executed at this address each tick. Defaults to org_offset@config.properties
*/ */
private int codeSegmentOffset; private int codeSegmentOffset;
/**
* Offset of the code segment. The code starts to get
* executed at this address each tick. Defaults to org_hwIVoffset@config.properties
*/
private int hardwareInterruptVectorOffset;
/** /**
* Instruction pointer, always points to the next instruction * Instruction pointer, always points to the next instruction
@ -74,6 +79,7 @@ public class CPU implements JSONSerialisable {
registerSet = new DefaultRegisterSet(); registerSet = new DefaultRegisterSet();
attachedHardware = new HashMap<>(); attachedHardware = new HashMap<>();
codeSegmentOffset = config.getInt("org_offset"); codeSegmentOffset = config.getInt("org_offset");
hardwareInterruptVectorOffset = config.getInt("org_hwIVoffset");
instructionSet.add(new JmpInstruction(this)); instructionSet.add(new JmpInstruction(this));
instructionSet.add(new JnzInstruction(this)); instructionSet.add(new JnzInstruction(this));
@ -469,13 +475,13 @@ public class CPU implements JSONSerialisable {
} }
/** /**
* Sets the IP to 0x0200 + Offset and pushes flags then the old IP * Sets the IP to codeSegmentOffset + Offset and pushes flags then the old IP
* *
*/ */
public void Interrupt(int hw, int offset, boolean retry) { public void interrupt(boolean hw, int offset) {
Instruction push = instructionSet.get("push"); Instruction push = instructionSet.get(PushInstruction.OPCODE);
push.execute(status.toByte(), status); push.execute(status.toByte(), status);
push.execute(ip, status); push.execute(ip, status);
this.setIp((char)(0x0200 + offset*2 + 0x0080*hw)); this.setIp((char)(codeSegmentOffset + offset*2 + (hw ? hardwareInterruptVectorOffset : 0)));
} }
} }

9
Server/src/main/java/net/simon987/server/assembly/instruction/IntInstruction.java
View File

@ -6,7 +6,7 @@ import net.simon987.server.assembly.Status;
/** /**
* Software Interrupt * Software Interrupt
* Pushes the flags register and the IP to the stack then * Pushes the flags register and the IP to the stack then
* Sets the IP to 0x0200 + 2*src. * Sets the IP to the CPU codeSegmentOffset + 2*src.
* (x2 is to align with jmp instructions) * (x2 is to align with jmp instructions)
* *
* No reserved interrupt vectors yet * No reserved interrupt vectors yet
@ -23,12 +23,7 @@ public class IntInstruction extends Instruction{
@Override @Override
public Status execute(int src, Status status) { public Status execute(int src, Status status) {
cpu.Interrupt(0, src, false); cpu.interrupt(false, src);
return status;
}
public Status execute(Status status) {
cpu.Interrupt(0,0, false);
return status; return status;
} }
} }

6
Server/src/main/java/net/simon987/server/assembly/instruction/IretInstruction.java
View File

@ -16,13 +16,13 @@ public class IretInstruction extends Instruction{
private CPU cpu; private CPU cpu;
public IretInstruction(CPU cpu) { public IretInstruction(CPU cpu) {
super("intr", OPCODE); super("iret", OPCODE);
this.cpu = cpu; this.cpu = cpu;
} }
public Status execute(Status status) { public Status execute(Status status) {
cpu.setIp((char)cpu.getMemory().get(cpu.getRegisterSet().getRegister("SP").getValue())); //IP (SP + 0) cpu.setIp((char)cpu.getMemory().get(cpu.getRegisterSet().getRegister("SP").getValue())); //IP = (SP + 0)
status.fromByte((char) cpu.getMemory().get(cpu.getRegisterSet().getRegister("SP").getValue() + 1)); //Status (SP + 1) status.fromByte((char) cpu.getMemory().get(cpu.getRegisterSet().getRegister("SP").getValue() + 1)); //Status = (SP + 1)
cpu.getRegisterSet().getRegister("SP").setValue(cpu.getRegisterSet().getRegister("SP").getValue() + 2); //Increment SP (stack grows towards smaller) cpu.getRegisterSet().getRegister("SP").setValue(cpu.getRegisterSet().getRegister("SP").getValue() + 2); //Increment SP (stack grows towards smaller)
return status; return status;
} }

2
config.properties
View File

@ -20,6 +20,8 @@ cert_path=certificates
tick_length=1000 tick_length=1000
# Default offset of the origin (starting point of code execution) in words # Default offset of the origin (starting point of code execution) in words
org_offset=512 org_offset=512
# Default offset of interrupts from hardware (from starting execution point)
org_hwIVoffset=126
# Address of the stack bottom # Address of the stack bottom
stack_bottom=65536 stack_bottom=65536
# Size of the memory in words # Size of the memory in words