// 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/errors.h"
#include "core/hle/kernel/thread.h"
#include "core/memory.h"
namespace Kernel {
/// Offset into command buffer of header
static const int kCommandHeaderOffset = 0x80;
/**
* 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
* @param offset Optional offset into command buffer (in bytes)
* @return Pointer to command buffer
*/
inline u32* GetCommandBuffer(const int offset = 0) {
return (u32*)Memory::GetPointer(GetCurrentThread()->GetTLSAddress() + kCommandHeaderOffset +
offset);
}
/// Offset into static buffers, relative to command buffer header
static const int kStaticBuffersOffset = 0x100;
/**
* Returns a pointer to the static buffers area in the current thread's TLS
* TODO(Subv): cf. GetCommandBuffer
* @param offset Optional offset into static buffers area (in bytes)
* @return Pointer to static buffers area
*/
inline u32* GetStaticBuffers(const int offset = 0) {
return GetCommandBuffer(kStaticBuffersOffset + offset);
}
}
namespace IPC {
/// Size of the command buffer area, in 32-bit words.
constexpr size_t COMMAND_BUFFER_LENGTH = 0x100 / sizeof(u32);
// These errors are commonly returned by invalid IPC translations, so alias them here for
// convenience.
// TODO(yuriks): These will probably go away once translation is implemented inside the kernel.
using Kernel::ERR_INVALID_BUFFER_DESCRIPTOR;
constexpr auto ERR_INVALID_HANDLE = Kernel::ERR_INVALID_HANDLE_OS;
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,
};
union Header {
u32 raw;
BitField<0, 6, u32> translate_params_size;
BitField<6, 6, u32> normal_params_size;
BitField<16, 16, u32> command_id;
};
/**
* @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 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 @p normal_params_size is equivalent to the number of normal parameters,
* @p translate_params_size includes the size occupied by the translate parameters headers.
*/
inline u32 MakeHeader(u16 command_id, unsigned int normal_params_size,
unsigned int translate_params_size) {
Header header{};
header.command_id.Assign(command_id);
header.normal_params_size.Assign(normal_params_size);
header.translate_params_size.Assign(translate_params_size);
return header.raw;
}
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;
}
union StaticBufferDescInfo {
u32 raw;
BitField<0, 4, u32> descriptor_type;
BitField<10, 4, u32> buffer_id;
BitField<14, 18, u32> size;
};
inline u32 StaticBufferDesc(u32 size, u8 buffer_id) {
StaticBufferDescInfo info{};
info.descriptor_type.Assign(StaticBuffer);
info.buffer_id.Assign(buffer_id);
info.size.Assign(size);
return info.raw;
}
/**
* @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 : u32 {
R = 1,
W = 2,
RW = R | W,
};
union MappedBufferDescInfo {
u32 raw;
BitField<0, 4, u32> flags;
BitField<1, 2, MappedBufferPermissions> perms;
BitField<4, 28, u32> size;
};
inline u32 MappedBufferDesc(u32 size, MappedBufferPermissions perms) {
MappedBufferDescInfo info{};
info.flags.Assign(MappedBuffer);
info.perms.Assign(perms);
info.size.Assign(size);
return info.raw;
}
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
