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Atmosphere/exosphere/program/source/smc/secmon_smc_result.cpp

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