Add helpers to create IPC command buffer headers and descriptors

src/core/hle/kernel/session.h

@@ -8,6 +8,40 @@
 #include "core/hle/kernel/thread.h"
 #include "core/memory.h"
 
+namespace IPC {
+
+inline u32 MakeHeader(u16 command_id, unsigned int regular_params, unsigned int translate_params) {
+    return ((u32)command_id << 16) | (((u32)regular_params & 0x3F) << 6) | (((u32)translate_params & 0x3F) << 0);
+}
+
+inline u32 MoveHandleDesc(unsigned int num_handles = 1) {
+    return 0x0 | ((num_handles - 1) << 26);
+}
+
+inline u32 CopyHandleDesc(unsigned int num_handles = 1) {
+    return 0x10 | ((num_handles - 1) << 26);
+}
+
+inline u32 CallingPidDesc() {
+    return 0x20;
+}
+
+inline u32 StaticBufferDesc(u32 size, unsigned int buffer_id) {
+    return 0x2 | (size << 14) | ((buffer_id & 0xF) << 10);
+}
+
+enum MappedBufferPermissions {
+    R = 2,
+    W = 4,
+    RW = R | W,
+};
+
+inline u32 MappedBufferDesc(u32 size, MappedBufferPermissions perms) {
+    return 0x8 | (size << 4) | (u32)perms;
+}
+
+}
+
 namespace Kernel {
 
 static const int kCommandHeaderOffset = 0x80; ///< Offset into command buffer of header