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