From e81fb68357f8e7bae5dcb480c4fc2069822952f3 Mon Sep 17 00:00:00 2001
From: belliash <belliash@codingworkshop.eu.org>
Date: Thu, 2 Mar 2023 16:25:41 +0100
Subject: [PATCH] Initial support processor idle functionality

---
 xtoskrnl/CMakeLists.txt      |  1 +
 xtoskrnl/includes/globals.h  |  1 -
 xtoskrnl/includes/popfuncs.h | 23 +++++++++++++++++
 xtoskrnl/includes/xtos.h     |  2 ++
 xtoskrnl/po/idle.c           | 50 ++++++++++++++++++++++++++++++++++++
 5 files changed, 76 insertions(+), 1 deletion(-)
 create mode 100644 xtoskrnl/includes/popfuncs.h
 create mode 100644 xtoskrnl/po/idle.c

diff --git a/xtoskrnl/CMakeLists.txt b/xtoskrnl/CMakeLists.txt
index 63d35ee..d5be385 100644
--- a/xtoskrnl/CMakeLists.txt
+++ b/xtoskrnl/CMakeLists.txt
@@ -29,6 +29,7 @@ list(APPEND XTOSKRNL_SOURCE
     ${XTOSKRNL_SOURCE_DIR}/ke/${ARCH}/proc.c
     ${XTOSKRNL_SOURCE_DIR}/mm/kpools.c
     ${XTOSKRNL_SOURCE_DIR}/mm/${ARCH}/pages.c
+    ${XTOSKRNL_SOURCE_DIR}/po/idle.c
     ${XTOSKRNL_SOURCE_DIR}/rtl/atomic.c
     ${XTOSKRNL_SOURCE_DIR}/rtl/byteswap.c
     ${XTOSKRNL_SOURCE_DIR}/rtl/memory.c
diff --git a/xtoskrnl/includes/globals.h b/xtoskrnl/includes/globals.h
index 6fb1d39..d84d7bd 100644
--- a/xtoskrnl/includes/globals.h
+++ b/xtoskrnl/includes/globals.h
@@ -10,7 +10,6 @@
 #define __XTOSKRNL_GLOBALS_H
 
 #include <xtos.h>
-#include ARCH_HEADER(globals.h)
 
 
 /* FrameBuffer information */
diff --git a/xtoskrnl/includes/popfuncs.h b/xtoskrnl/includes/popfuncs.h
new file mode 100644
index 0000000..c86ec86
--- /dev/null
+++ b/xtoskrnl/includes/popfuncs.h
@@ -0,0 +1,23 @@
+/**
+ * PROJECT:         ExectOS
+ * COPYRIGHT:       See COPYING.md in the top level directory
+ * FILE:            xtoskrnl/includes/popfuncs.h
+ * DESCRIPTION:     Private routine definitions for kernel power manager
+ * DEVELOPERS:      Rafal Kupiec <belliash@codingworkshop.eu.org>
+ */
+
+#ifndef __XTOSKRNL_POPFUNCS_H
+#define __XTOSKRNL_POPFUNCS_H
+
+#include <xtos.h>
+
+
+XTAPI
+VOID
+PoInitializeProcessorControlBlock(IN OUT PKPROCESSOR_CONTROL_BLOCK Prcb);
+
+XTFASTCALL
+VOID
+PopIdle0Function(IN PPROCESSOR_POWER_STATE PowerState);
+
+#endif /* __XTOSKRNL_POPFUNCS_H */
diff --git a/xtoskrnl/includes/xtos.h b/xtoskrnl/includes/xtos.h
index 9d45b5f..5ed93f3 100644
--- a/xtoskrnl/includes/xtos.h
+++ b/xtoskrnl/includes/xtos.h
@@ -13,6 +13,8 @@
 #include "globals.h"
 #include "arpfuncs.h"
 #include "kepfuncs.h"
+#include "popfuncs.h"
 
+#include ARCH_HEADER(globals.h)
 #include ARCH_HEADER(arpfuncs.h)
 #include ARCH_HEADER(kepfuncs.h)
diff --git a/xtoskrnl/po/idle.c b/xtoskrnl/po/idle.c
new file mode 100644
index 0000000..4acc665
--- /dev/null
+++ b/xtoskrnl/po/idle.c
@@ -0,0 +1,50 @@
+/**
+ * PROJECT:         ExectOS
+ * COPYRIGHT:       See COPYING.md in the top level directory
+ * FILE:            xtoskrnl/po/idle.c
+ * DESCRIPTION:     Processor idle functionality support
+ * DEVELOPERS:      Rafal Kupiec <belliash@codingworkshop.eu.org>
+ */
+
+#include <xtos.h>
+
+
+/**
+ * Initializes Processor Control Block's (PRCB) power state structures.
+ *
+ * @param Prcb
+ *        Supplies a pointer to the PRCB being initialized.
+ *
+ * @return This routine does not return any value.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+VOID
+PoInitializeProcessorControlBlock(IN OUT PKPROCESSOR_CONTROL_BLOCK Prcb)
+{
+    RtlZeroMemory(&Prcb->PowerState, sizeof(Prcb->PowerState));
+
+    Prcb->PowerState.Idle0TimeLimit = 0xFFFFFFFF;
+    Prcb->PowerState.CurrentThrottle = 100;
+    Prcb->PowerState.IdleFunction = PopIdle0Function;
+
+    KeInitializeTimerEx(&Prcb->PowerState.PerfTimer, SynchronizationTimer);
+}
+
+/**
+ * Processor idle loop routine.
+ *
+ * @param PowerState
+ *        Supplies a pointer to the structere containing current processor power state.
+ *
+ * @return This routine does not return any value.
+ *
+ * @since XT 1.0
+ */
+XTFASTCALL
+VOID
+PopIdle0Function(IN PPROCESSOR_POWER_STATE PowerState)
+{
+    UNIMPLEMENTED;
+}