From e7a6ae9cc5b84abe63c7439005656ecc4beda8c1 Mon Sep 17 00:00:00 2001
From: Patrick Williams <iawillia@us.ibm.com>
Date: Wed, 9 Jun 2010 14:12:01 -0500
Subject: Kernel spinlock support.

---
 src/include/kernel/spinlock.H  | 20 ++++++++++++++++++++
 src/include/util/locked/lock.H | 20 ++++++++++++++++++++
 src/kernel/makefile            |  2 +-
 src/kernel/spinlock.C          | 12 ++++++++++++
 src/libc++/builtins.C          |  6 ++++++
 5 files changed, 59 insertions(+), 1 deletion(-)
 create mode 100644 src/include/kernel/spinlock.H
 create mode 100644 src/include/util/locked/lock.H
 create mode 100644 src/kernel/spinlock.C

(limited to 'src')

diff --git a/src/include/kernel/spinlock.H b/src/include/kernel/spinlock.H
new file mode 100644
index 000000000..92d1f6e05
--- /dev/null
+++ b/src/include/kernel/spinlock.H
@@ -0,0 +1,20 @@
+#ifndef __KERNEL_SPINLOCK_H
+#define __KERNEL_SPINLOCK_H
+
+#include <util/locked/lock.H>
+#include <stdint.h>
+
+class Spinlock : public Util::Locked::Lock
+{
+    public:
+	Spinlock() : iv_reserve(0), iv_ready(0) {};
+
+	void lock();
+	void unlock();
+
+    private:
+	volatile uint64_t iv_reserve;
+	volatile uint64_t iv_ready;
+};
+
+#endif
diff --git a/src/include/util/locked/lock.H b/src/include/util/locked/lock.H
new file mode 100644
index 000000000..b5237276e
--- /dev/null
+++ b/src/include/util/locked/lock.H
@@ -0,0 +1,20 @@
+#ifndef __UTIL_LOCKED_LOCK_H
+#define __UTIL_LOCKED_LOCK_H
+
+namespace Util
+{
+    namespace Locked
+    {
+	class Lock
+	{
+	    public:
+		Lock() {};
+		virtual ~Lock() {};
+		
+		virtual void lock() = 0;
+		virtual void unlock() = 0;
+	};
+    };
+};
+
+#endif
diff --git a/src/kernel/makefile b/src/kernel/makefile
index c07ae815a..629c39bcb 100644
--- a/src/kernel/makefile
+++ b/src/kernel/makefile
@@ -2,7 +2,7 @@ OBJDIR = ../../obj
 include ../../config.mk
 
 OBJS = start.o kernel.o console.o pagemgr.o heapmgr.o taskmgr.o cpumgr.o
-OBJS += syscall.o scheduler.o
+OBJS += syscall.o scheduler.o spinlock.o
 OBJECTS = $(addprefix ${OBJDIR}/, ${OBJS})
 
 all: ${OBJECTS}
diff --git a/src/kernel/spinlock.C b/src/kernel/spinlock.C
new file mode 100644
index 000000000..bfada05c4
--- /dev/null
+++ b/src/kernel/spinlock.C
@@ -0,0 +1,12 @@
+#include <kernel/spinlock.H>
+
+void Spinlock::lock()
+{
+    uint64_t reservation = __sync_fetch_and_add(&iv_reserve, 1);
+    while(iv_ready != reservation);
+}
+
+void Spinlock::unlock()
+{
+    __sync_add_and_fetch(&iv_ready, 1);
+}
diff --git a/src/libc++/builtins.C b/src/libc++/builtins.C
index 66eae1092..c2fffa816 100644
--- a/src/libc++/builtins.C
+++ b/src/libc++/builtins.C
@@ -76,4 +76,10 @@ extern "C" int __cxa_atexit(void (*)(void*), void*, void*)
     return 0;
 }
 
+extern "C" void __cxa_pure_virtual()
+{
+    // TODO: Add better code for invalid pure virtual call.
+    while(1);
+}
+
 void*   __dso_handle = (void*) &__dso_handle;
-- 
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