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diff --git a/src/core/hle/ipc.h b/src/core/hle/ipc.h
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+// Copyright 2016 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "common/common_types.h"
+#include "core/hle/kernel/thread.h"
+#include "core/memory.h"
+
+namespace Kernel {
+class ServerSession;
+
+// TODO(Subv): Move these declarations out of here
+static const int kCommandHeaderOffset = 0x80; ///< Offset into command buffer of header
+
+/**
+ * Returns a pointer to the command buffer in the current thread's TLS
+ * TODO(Subv): This is not entirely correct, the command buffer should be copied from
+ * the thread's TLS to an intermediate buffer in kernel memory, and then copied again to
+ * the service handler process' memory.
+ * @param offset Optional offset into command buffer
+ * @return Pointer to command buffer
+ */
+inline u32* GetCommandBuffer(const int offset = 0) {
+ return (u32*)Memory::GetPointer(GetCurrentThread()->GetTLSAddress() + kCommandHeaderOffset +
+ offset);
+}
+}
+
+namespace IPC {
+
+enum DescriptorType : u32 {
+ // Buffer related desciptors types (mask : 0x0F)
+ StaticBuffer = 0x02,
+ PXIBuffer = 0x04,
+ MappedBuffer = 0x08,
+ // Handle related descriptors types (mask : 0x30, but need to check for buffer related
+ // descriptors first )
+ CopyHandle = 0x00,
+ MoveHandle = 0x10,
+ CallingPid = 0x20,
+};
+
+/**
+ * @brief Creates a command header to be used for IPC
+ * @param command_id ID of the command to create a header for.
+ * @param normal_params Size of the normal parameters in words. Up to 63.
+ * @param translate_params_size Size of the translate parameters in words. Up to 63.
+ * @return The created IPC header.
+ *
+ * Normal parameters are sent directly to the process while the translate parameters might go
+ * through modifications and checks by the kernel.
+ * The translate parameters are described by headers generated with the IPC::*Desc functions.
+ *
+ * @note While #normal_params is equivalent to the number of normal parameters,
+ * #translate_params_size includes the size occupied by the translate parameters headers.
+ */
+constexpr u32 MakeHeader(u16 command_id, unsigned int normal_params,
+ unsigned int translate_params_size) {
+ return (u32(command_id) << 16) | ((u32(normal_params) & 0x3F) << 6) |
+ (u32(translate_params_size) & 0x3F);
+}
+
+union Header {
+ u32 raw;
+ BitField<0, 6, u32> translate_params_size;
+ BitField<6, 6, u32> normal_params;
+ BitField<16, 16, u32> command_id;
+};
+
+inline Header ParseHeader(u32 header) {
+ return {header};
+}
+
+constexpr u32 MoveHandleDesc(u32 num_handles = 1) {
+ return MoveHandle | ((num_handles - 1) << 26);
+}
+
+constexpr u32 CopyHandleDesc(u32 num_handles = 1) {
+ return CopyHandle | ((num_handles - 1) << 26);
+}
+
+constexpr u32 CallingPidDesc() {
+ return CallingPid;
+}
+
+constexpr bool isHandleDescriptor(u32 descriptor) {
+ return (descriptor & 0xF) == 0x0;
+}
+
+constexpr u32 HandleNumberFromDesc(u32 handle_descriptor) {
+ return (handle_descriptor >> 26) + 1;
+}
+
+constexpr u32 StaticBufferDesc(u32 size, u8 buffer_id) {
+ return StaticBuffer | (size << 14) | ((buffer_id & 0xF) << 10);
+}
+
+union StaticBufferDescInfo {
+ u32 raw;
+ BitField<10, 4, u32> buffer_id;
+ BitField<14, 18, u32> size;
+};
+
+inline StaticBufferDescInfo ParseStaticBufferDesc(const u32 desc) {
+ return {desc};
+}
+
+/**
+ * @brief Creates a header describing a buffer to be sent over PXI.
+ * @param size Size of the buffer. Max 0x00FFFFFF.
+ * @param buffer_id The Id of the buffer. Max 0xF.
+ * @param is_read_only true if the buffer is read-only. If false, the buffer is considered to have
+ * read-write access.
+ * @return The created PXI buffer header.
+ *
+ * The next value is a phys-address of a table located in the BASE memregion.
+ */
+inline u32 PXIBufferDesc(u32 size, unsigned buffer_id, bool is_read_only) {
+ u32 type = PXIBuffer;
+ if (is_read_only)
+ type |= 0x2;
+ return type | (size << 8) | ((buffer_id & 0xF) << 4);
+}
+
+enum MappedBufferPermissions {
+ R = 1,
+ W = 2,
+ RW = R | W,
+};
+
+constexpr u32 MappedBufferDesc(u32 size, MappedBufferPermissions perms) {
+ return MappedBuffer | (size << 4) | (u32(perms) << 1);
+}
+
+union MappedBufferDescInfo {
+ u32 raw;
+ BitField<4, 28, u32> size;
+ BitField<1, 2, MappedBufferPermissions> perms;
+};
+
+inline MappedBufferDescInfo ParseMappedBufferDesc(const u32 desc) {
+ return{ desc };
+}
+
+inline DescriptorType GetDescriptorType(u32 descriptor) {
+ // Note: Those checks must be done in this order
+ if (isHandleDescriptor(descriptor))
+ return (DescriptorType)(descriptor & 0x30);
+
+ // handle the fact that the following descriptors can have rights
+ if (descriptor & MappedBuffer)
+ return MappedBuffer;
+
+ if (descriptor & PXIBuffer)
+ return PXIBuffer;
+
+ return StaticBuffer;
+}
+
+} // namespace IPC