mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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106 lines
3.5 KiB
C++
106 lines
3.5 KiB
C++
/*
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* Copyright (c) 2018-2020 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <exosphere.hpp>
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#include "../secmon_error.hpp"
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#include "../secmon_page_mapper.hpp"
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#include "secmon_smc_result.hpp"
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namespace ams::secmon::smc {
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namespace {
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constinit u64 g_async_key = InvalidAsyncKey;
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constinit GetResultHandler g_async_handler = nullptr;
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u64 GenerateRandomU64() {
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/* NOTE: This is one of the only places where Nintendo does not do data flushing. */
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/* to ensure coherency when doing random byte generation. */
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/* It is not clear why it is necessary elsewhere but not here. */
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/* TODO: Figure out why. */
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u64 v;
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se::GenerateRandomBytes(std::addressof(v), sizeof(v));
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return v;
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}
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}
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u64 BeginAsyncOperation(GetResultHandler handler) {
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/* Only allow one async operation at a time. */
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if (g_async_key != InvalidAsyncKey) {
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return InvalidAsyncKey;
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}
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/* Generate a random async key. */
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g_async_key = GenerateRandomU64();
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g_async_handler = handler;
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return g_async_key;
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}
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void CancelAsyncOperation(u64 async_key) {
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if (async_key == g_async_key) {
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g_async_key = InvalidAsyncKey;
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}
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}
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void EndAsyncOperation() {
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gic::SetPending(SecurityEngineUserInterruptId);
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}
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SmcResult SmcGetResult(SmcArguments &args) {
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/* Decode arguments. */
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const u64 async_key = args.r[1];
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/* Validate arguments. */
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SMC_R_UNLESS(g_async_key != InvalidAsyncKey, NoAsyncOperation);
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SMC_R_UNLESS(g_async_key == async_key, InvalidAsyncOperation);
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/* Call the handler. */
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args.r[1] = static_cast<u64>(g_async_handler(nullptr, 0));
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g_async_key = InvalidAsyncKey;
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return SmcResult::Success;
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}
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SmcResult SmcGetResultData(SmcArguments &args) {
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/* Decode arguments. */
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const u64 async_key = args.r[1];
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const uintptr_t user_phys_addr = args.r[2];
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const size_t user_size = args.r[3];
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/* Allocate a work buffer on the stack. */
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alignas(8) u8 work_buffer[1_KB];
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/* Validate arguments. */
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SMC_R_UNLESS(g_async_key != InvalidAsyncKey, NoAsyncOperation);
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SMC_R_UNLESS(g_async_key == async_key, InvalidAsyncOperation);
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SMC_R_UNLESS(user_size <= sizeof(work_buffer), InvalidArgument);
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/* Call the handler. */
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args.r[1] = static_cast<u64>(g_async_handler(work_buffer, user_size));
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g_async_key = InvalidAsyncKey;
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/* Map the user buffer. */
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{
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UserPageMapper mapper(user_phys_addr);
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SMC_R_UNLESS(mapper.Map(), InvalidArgument);
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SMC_R_UNLESS(mapper.CopyToUser(user_phys_addr, work_buffer, user_size), InvalidArgument);
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}
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return SmcResult::Success;
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}
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}
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