Introduce PS subsystem with IDLE process and thread creation

xtoskrnl/ps/process.cc

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+/**
+ * PROJECT:         ExectOS
+ * COPYRIGHT:       See COPYING.md in the top level directory
+ * FILE:            xtoskrnl/po/process.cc
+ * DESCRIPTION:     Process Management
+ * DEVELOPERS:      Aiken Harris <harraiken91@gmail.com>
+ */
+
+#include <xtos.hh>
+
+
+/**
+ * Creates the global IDLE process.
+ *
+ * @param Prcb
+ *        Supplies a pointer to the Processor Control Block of the Bootstrap Processor.
+ *
+ * @return This routine does not return any value.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+VOID
+PS::Process::CreateIdleProcess(IN PKPROCESSOR_CONTROL_BLOCK Prcb)
+{
+    ULONG_PTR PageDirectory[2];
+    PKPROCESS IdleProcess;
+    PKTHREAD IdleThread;
+
+    /* Get initial IDLE thread */
+    IdleThread = Prcb->CurrentThread;
+
+    /* Get initial IDLE process */
+    IdleProcess = IdleThread->ApcState.Process;
+
+    /* Setup placeholder for page directory entries */
+    PageDirectory[0] = 0;
+    PageDirectory[1] = 0;
+
+    /* Initialize Idle process and Idle thread */
+    KE::KProcess::InitializeIdleProcess(IdleProcess, PageDirectory);
+    KE::KThread::InitializeIdleThread(IdleProcess, IdleThread, Prcb, AR::ProcessorSupport::GetBootStack());
+}

xtoskrnl/ps/thread.cc

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+/**
+ * PROJECT:         ExectOS
+ * COPYRIGHT:       See COPYING.md in the top level directory
+ * FILE:            xtoskrnl/po/thread.cc
+ * DESCRIPTION:     Thread Management
+ * DEVELOPERS:      Aiken Harris <harraiken91@gmail.com>
+ */
+
+#include <xtos.hh>
+
+
+/**
+ * Allocates and initializes a per-processor IDLE thread for an Application Processor (AP).
+ *
+ * @param Prcb
+ *        Supplies a pointer to the Processor Control Block of the target processor.
+ *
+ * @param Stack
+ *        Supplies a pointer to the pre-allocated kernel stack for the new idle thread.
+ *
+ * @return This routine returns a status code indicating the success or failure of the operation.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+XTSTATUS
+PS::Thread::CreateIdleThread(IN PKPROCESSOR_CONTROL_BLOCK Prcb,
+                             IN PVOID Stack)
+{
+    PKPROCESS IdleProcess;
+    PETHREAD IdleThread;
+    XTSTATUS Status;
+
+    /* Retrieve the global IDLE process container */
+    IdleProcess = KE::KProcess::GetIdleProcess();
+
+    /* Allocate the Executive Thread object */
+    Status = MM::Allocator::AllocatePool(NonPagedPool, sizeof(ETHREAD), (PVOID*)&IdleThread);
+    if(Status != STATUS_SUCCESS)
+    {
+        /* Allocation failed, return the status code */
+        return Status;
+    }
+
+    /* Zero the allocated memory to prevent uninitialized data */
+    RTL::Memory::ZeroMemory(IdleThread, sizeof(ETHREAD));
+
+    /* Register the new thread within the Processor Control Block */
+    Prcb->CurrentThread = &IdleThread->ThreadControlBlock;
+    Prcb->IdleThread = &IdleThread->ThreadControlBlock;
+
+    /* Initialize the IDLE thread */
+    KE::KThread::InitializeIdleThread(IdleProcess,
+                                      &IdleThread->ThreadControlBlock,
+                                      Prcb,
+                                      Stack);
+
+    /* Return success */
+    return STATUS_SUCCESS;
+}