1 files changed, 70 insertions, 0 deletions
diff --git a/src/pkg/runtime/windows/mem.c b/src/pkg/runtime/windows/mem.c
new file mode 100644
index 000000000..5d2291fa3
--- /dev/null
+++ b/src/pkg/runtime/windows/mem.c
@@ -0,0 +1,70 @@
+// Copyright 2010 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "runtime.h"
+#include "os.h"
+#include "defs.h"
+#include "malloc.h"
+
+enum {
+	MEM_COMMIT = 0x1000,
+	MEM_RESERVE = 0x2000,
+	MEM_RELEASE = 0x8000,
+	
+	PAGE_EXECUTE_READWRITE = 0x40,
+};
+
+#pragma dynimport runtime·VirtualAlloc VirtualAlloc "kernel32.dll"
+#pragma dynimport runtime·VirtualFree VirtualFree "kernel32.dll"
+extern void *runtime·VirtualAlloc;
+extern void *runtime·VirtualFree;
+
+void*
+runtime·SysAlloc(uintptr n)
+{
+	mstats.sys += n;
+	return runtime·stdcall(runtime·VirtualAlloc, 4, nil, n, (uintptr)(MEM_COMMIT|MEM_RESERVE), (uintptr)PAGE_EXECUTE_READWRITE);
+}
+
+void
+runtime·SysUnused(void *v, uintptr n)
+{
+	USED(v);
+	USED(n);
+}
+
+void
+runtime·SysFree(void *v, uintptr n)
+{
+	uintptr r;
+
+	mstats.sys -= n;
+	r = (uintptr)runtime·stdcall(runtime·VirtualFree, 3, v, (uintptr)0, (uintptr)MEM_RELEASE);
+	if(r == 0)
+		runtime·throw("runtime: failed to release pages");
+}
+
+void*
+runtime·SysReserve(void *v, uintptr n)
+{
+	// v is just a hint.
+	// First try at v.
+	v = runtime·stdcall(runtime·VirtualAlloc, 4, v, n, (uintptr)MEM_RESERVE, (uintptr)PAGE_EXECUTE_READWRITE);
+	if(v != nil)
+		return v;
+	
+	// Next let the kernel choose the address.
+	return runtime·stdcall(runtime·VirtualAlloc, 4, nil, n, (uintptr)MEM_RESERVE, (uintptr)PAGE_EXECUTE_READWRITE);
+}
+
+void
+runtime·SysMap(void *v, uintptr n)
+{
+	void *p;
+	
+	mstats.sys += n;
+	p = runtime·stdcall(runtime·VirtualAlloc, 4, v, n, (uintptr)MEM_COMMIT, (uintptr)PAGE_EXECUTE_READWRITE);
+	if(p != v)
+		runtime·throw("runtime: cannot map pages in arena address space");
+}