// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <string>
#include "common/assert.h"
#include "common/common_types.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/thread.h"
#include "core/hle/result.h"
#include "core/memory.h"
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
namespace Kernel {
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);
}
/**
* Kernel object representing the client endpoint of an IPC session. Sessions are the basic CTR-OS
* primitive for communication between different processes, and are used to implement service calls
* to the various system services.
*
* To make a service call, the client must write the command header and parameters to the buffer
* located at offset 0x80 of the TLS (Thread-Local Storage) area, then execute a SendSyncRequest
* SVC call with its Session handle. The kernel will read the command header, using it to marshall
* the parameters to the process at the server endpoint of the session. After the server replies to
* the request, the response is marshalled back to the caller's TLS buffer and control is
* transferred back to it.
*
* In Citra, only the client endpoint is currently implemented and only HLE calls, where the IPC
* request is answered by C++ code in the emulator, are supported. When SendSyncRequest is called
* with the session handle, this class's SyncRequest method is called, which should read the TLS
* buffer and emulate the call accordingly. Since the code can directly read the emulated memory,
* no parameter marshalling is done.
*
* In the long term, this should be turned into the full-fledged IPC mechanism implemented by
* CTR-OS so that IPC calls can be optionally handled by the real implementations of processes, as
* opposed to HLE simulations.
*/
class Session : public WaitObject {
public:
Session();
~Session() override;
std::string GetTypeName() const override {
return "Session";
}
static const HandleType HANDLE_TYPE = HandleType::Session;
HandleType GetHandleType() const override {
return HANDLE_TYPE;
}
/**
* Handles a synchronous call to this session using HLE emulation. Emulated <-> emulated calls
* aren't supported yet.
*/
virtual ResultVal<bool> SyncRequest() = 0;
// TODO(bunnei): These functions exist to satisfy a hardware test with a Session object
// passed into WaitSynchronization. Figure out the meaning of them.
bool ShouldWait() override {
return true;
}
void Acquire() override {
ASSERT_MSG(!ShouldWait(), "object unavailable!");
}
};
}
