// Copyright 2016 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include "core/hle/ipc.h"
#include "core/hle/kernel/kernel.h"
namespace IPC {
class RequestHelperBase {
protected:
u32* cmdbuf;
ptrdiff_t index = 1;
Header header;
public:
RequestHelperBase(u32* command_buffer, Header command_header)
: cmdbuf(command_buffer), header(command_header) {}
/// Returns the total size of the request in words
size_t TotalSize() const {
return 1 /* command header */ + header.normal_params_size + header.translate_params_size;
}
void ValidateHeader() {
DEBUG_ASSERT_MSG(index == TotalSize(), "Operations do not match the header (cmd 0x%x)",
header.raw);
}
/**
* @brief Retrieves the address of a static buffer, used when a buffer is needed for output
* @param buffer_id The index of the static buffer
* @param data_size If non-null, will store the size of the buffer
*/
VAddr PeekStaticBuffer(u8 buffer_id, size_t* data_size = nullptr) const {
u32* static_buffer = cmdbuf + Kernel::kStaticBuffersOffset / 4 + buffer_id * 2;
if (data_size)
*data_size = StaticBufferDescInfo{static_buffer[0]}.size;
return static_buffer[1];
}
};
class RequestBuilder : public RequestHelperBase {
public:
RequestBuilder(u32* command_buffer, Header command_header)
: RequestHelperBase(command_buffer, command_header) {
cmdbuf[0] = header.raw;
}
explicit RequestBuilder(u32* command_buffer, u32 command_header)
: RequestBuilder(command_buffer, Header{command_header}) {}
RequestBuilder(u32* command_buffer, u16 command_id, unsigned normal_params_size,
unsigned translate_params_size)
: RequestBuilder(command_buffer,
MakeHeader(command_id, normal_params_size, translate_params_size)) {}
// Validate on destruction, as there shouldn't be any case where we don't want it
~RequestBuilder() {
ValidateHeader();
}
template <typename T>
void Push(T value);
void Push(u32 value) {
cmdbuf[index++] = value;
}
template <typename First, typename... Other>
void Push(const First& first_value, const Other&... other_values) {
Push(first_value);
Push(other_values...);
}
/**
* @brief Copies the content of the given trivially copyable class to the buffer as a normal
* param
* @note: The input class must be correctly packed/padded to fit hardware layout.
*/
template <typename T>
void PushRaw(const T& value) {
static_assert(std::is_trivially_copyable<T>(), "Raw types should be trivially copyable");
std::memcpy(cmdbuf + index, &value, sizeof(T));
index += (sizeof(T) + 3) / 4; // round up to word length
}
// TODO : ensure that translate params are added after all regular params
template <typename... H>
void PushCopyHandles(H... handles) {
Push(CopyHandleDesc(sizeof...(H)));
Push(static_cast<Kernel::Handle>(handles)...);
}
template <typename... H>
void PushMoveHandles(H... handles) {
Push(MoveHandleDesc(sizeof...(H)));
Push(static_cast<Kernel::Handle>(handles)...);
}
void PushCurrentPIDHandle() {
Push(CallingPidDesc());
Push(u32(0));
}
void PushStaticBuffer(VAddr buffer_vaddr, u32 size, u8 buffer_id) {
Push(StaticBufferDesc(size, buffer_id));
Push(buffer_vaddr);
}
void PushMappedBuffer(VAddr buffer_vaddr, u32 size, MappedBufferPermissions perms) {
Push(MappedBufferDesc(size, perms));
Push(buffer_vaddr);
}
};
/// Push ///
template <>
inline void RequestBuilder::Push<u32>(u32 value) {
Push(value);
}
template <>
inline void RequestBuilder::Push<u64>(u64 value) {
Push(static_cast<u32>(value));
Push(static_cast<u32>(value >> 32));
}
template <>
inline void RequestBuilder::Push<ResultCode>(ResultCode value) {
Push(value.raw);
}
class RequestParser : public RequestHelperBase {
public:
RequestParser(u32* command_buffer, Header command_header)
: RequestHelperBase(command_buffer, command_header) {}
explicit RequestParser(u32* command_buffer, u32 command_header)
: RequestParser(command_buffer, Header{command_header}) {}
RequestParser(u32* command_buffer, u16 command_id, unsigned normal_params_size,
unsigned translate_params_size)
: RequestParser(command_buffer,
MakeHeader(command_id, normal_params_size, translate_params_size)) {}
RequestBuilder MakeBuilder(u32 normal_params_size, u32 translate_params_size,
bool validateHeader = true) {
if (validateHeader)
ValidateHeader();
Header builderHeader{
MakeHeader(header.command_id, normal_params_size, translate_params_size)};
return {cmdbuf, builderHeader};
}
template <typename T>
T Pop();
template <typename T>
void Pop(T& value);
template <typename First, typename... Other>
void Pop(First& first_value, Other&... other_values);
Kernel::Handle PopHandle();
template <typename... H>
void PopHandles(H&... handles);
/**
* @brief Pops the static buffer vaddr
* @return The virtual address of the buffer
* @param[out] data_size If non-null, the pointed value will be set to the size of the data
* @param[out] useStaticBuffersToGetVaddr Indicates if we should read the vaddr from the static
* buffers (which is the correct thing to do, but no service presently implement it) instead of
* using the same value as the process who sent the request
* given by the source process
*
* Static buffers must be set up before any IPC request using those is sent.
* It is the duty of the process (usually services) to allocate and set up the receiving static
* buffer information
* Please note that the setup uses virtual addresses.
*/
VAddr PopStaticBuffer(size_t* data_size = nullptr, bool useStaticBuffersToGetVaddr = false);
/**
* @brief Pops the mapped buffer vaddr
* @return The virtual address of the buffer
* @param[out] data_size If non-null, the pointed value will be set to the size of the data
* given by the source process
* @param[out] buffer_perms If non-null, the pointed value will be set to the permissions of the
* buffer
*/
VAddr PopMappedBuffer(size_t* data_size = nullptr,
MappedBufferPermissions* buffer_perms = nullptr);
/**
* @brief Reads the next normal parameters as a struct, by copying it
* @note: The output class must be correctly packed/padded to fit hardware layout.
*/
template <typename T>
void PopRaw(T& value);
};
/// Pop ///
template <>
inline u32 RequestParser::Pop<u32>() {
return cmdbuf[index++];
}
template <>
inline u64 RequestParser::Pop<u64>() {
const u64 lsw = Pop<u32>();
const u64 msw = Pop<u32>();
return msw << 32 | lsw;
}
template <>
inline ResultCode RequestParser::Pop<ResultCode>() {
return ResultCode{Pop<u32>()};
}
template <typename T>
void RequestParser::Pop(T& value) {
value = Pop<T>();
}
template <typename First, typename... Other>
void RequestParser::Pop(First& first_value, Other&... other_values) {
first_value = Pop<First>();
Pop(other_values...);
}
inline Kernel::Handle RequestParser::PopHandle() {
const u32 handle_descriptor = Pop<u32>();
DEBUG_ASSERT_MSG(IsHandleDescriptor(handle_descriptor),
"Tried to pop handle(s) but the descriptor is not a handle descriptor");
DEBUG_ASSERT_MSG(HandleNumberFromDesc(handle_descriptor) == 1,
"Descriptor indicates that there isn't exactly one handle");
return Pop<Kernel::Handle>();
}
template <typename... H>
void RequestParser::PopHandles(H&... handles) {
const u32 handle_descriptor = Pop<u32>();
const int handles_number = sizeof...(H);
DEBUG_ASSERT_MSG(IsHandleDescriptor(handle_descriptor),
"Tried to pop handle(s) but the descriptor is not a handle descriptor");
DEBUG_ASSERT_MSG(handles_number == HandleNumberFromDesc(handle_descriptor),
"Number of handles doesn't match the descriptor");
Pop(static_cast<Kernel::Handle&>(handles)...);
}
inline VAddr RequestParser::PopStaticBuffer(size_t* data_size, bool useStaticBuffersToGetVaddr) {
const u32 sbuffer_descriptor = Pop<u32>();
StaticBufferDescInfo bufferInfo{sbuffer_descriptor};
if (data_size != nullptr)
*data_size = bufferInfo.size;
if (!useStaticBuffersToGetVaddr)
return Pop<VAddr>();
else {
ASSERT_MSG(0, "remove the assert if multiprocess/IPC translation are implemented.");
// The buffer has already been copied to the static buffer by the kernel during
// translation
Pop<VAddr>(); // Pop the calling process buffer address
// and get the vaddr from the static buffers
return cmdbuf[(0x100 >> 2) + bufferInfo.buffer_id * 2 + 1];
}
}
inline VAddr RequestParser::PopMappedBuffer(size_t* data_size,
MappedBufferPermissions* buffer_perms) {
const u32 sbuffer_descriptor = Pop<u32>();
MappedBufferDescInfo bufferInfo{sbuffer_descriptor};
if (data_size != nullptr)
*data_size = bufferInfo.size;
if (buffer_perms != nullptr)
*buffer_perms = bufferInfo.perms;
return Pop<VAddr>();
}
template <typename T>
void RequestParser::PopRaw(T& value) {
static_assert(std::is_trivially_copyable<T>(), "Raw types should be trivially copyable");
std::memcpy(&value, cmdbuf + index, sizeof(T));
index += (sizeof(T) + 3) / 4; // round up to word length
}
} // namespace IPC
