Add macros to construct Windows IOCTL codes, and to extract function

codes from an IOCTL. (The USB module will need them later.)

1 files changed, 19 insertions, 0 deletions

diff --git a/sys/compat/ndis/ntoskrnl_var.h b/sys/compat/ndis/ntoskrnl_var.h
index 4992d7c..0a24471 100644
--- a/sys/compat/ndis/ntoskrnl_var.h
+++ b/sys/compat/ndis/ntoskrnl_var.h
@@ -750,8 +750,27 @@ typedef struct devobj_extension devobj_extension;
 #define METHOD_OUT_DIRECT		2
 #define METHOD_NEITHER			3
 
+/* File access types */
+
+#define FILE_ANY_ACCESS			0x0000
+#define FILE_SPECIAL_ACCESS		FILE_ANY_ACCESS
+#define FILE_READ_ACCESS		0x0001
+#define FILE_WRITE_ACCESS		0x0002
+
+/* Recover I/O access method from IOCTL code. */
+
 #define IO_METHOD(x)			((x) & 0xFFFFFFFC)
 
+/* Recover function code from IOCTL code */
+
+#define IO_FUNC(x)			(((x) & 0x7FFC) >> 2)
+
+/* Macro to construct an IOCTL code. */
+
+#define IOCTL_CODE(dev, func, iomethod, acc)	\
+	((dev) << 16) | (acc << 14) | (func << 2) | (iomethod))
+
+
 struct io_status_block {
 	union {
 		uint32_t		isb_status;