wip: IPC and Runtime

Kernel/Source/OS/IPC.c

@@ -0,0 +1,46 @@
+#include <OS/IPC.h>
+#include <OS/Scheduler.h>
+#include <Arch/CPU.h>
+#include <Arch/Exceptions.h>
+
+UInt64 IPCSend(OSTask* sender, UInt64 handleID, UInt64 data) {
+    if (handleID == 0) return -1;
+    OSProcess* currentProcess = sender->process;
+    OSTask* targetTask = (OSTask*)SchedulerProcessGetHandle(currentProcess, handleID, kOSHandleTypeTask);
+    if (!targetTask) return -1;
+
+    if (targetTask->state == OSTaskStateBlockedReceive) {
+        ExceptionsContext* receiverContext = (ExceptionsContext*)targetTask->stackPointer;
+        receiverContext->x1 = data;
+        receiverContext->x0 = currentProcess->id;
+
+        targetTask->state = OSTaskStateRunning;
+        return 0;
+    }
+
+    if (targetTask->senderWaiting != nullptr) return -2;
+
+    targetTask->senderWaiting = sender;
+
+    SchedulerBlockCurrentTask(OSTaskStateBlockedSend);
+    return 0;
+}
+
+void IPCReceive(ExceptionsContext* receiverFrame) {
+    OSTask* receiver = SchedulerGetCurrentTask();
+
+    if (receiver->senderWaiting != nullptr) {
+        OSTask* sender = receiver->senderWaiting;
+
+        ExceptionsContext* senderContext = (ExceptionsContext*)sender->stackPointer;
+
+        receiverFrame->x1 = senderContext->x1;       // Data
+        receiverFrame->x0 = sender->process->id;     // Sender ID
+
+        receiver->senderWaiting = nullptr;
+        sender->state = OSTaskStateRunning;
+        return;
+    }
+
+    SchedulerBlockCurrentTask(OSTaskStateBlockedReceive);
+}