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Atmosphere/libraries/libmesosphere/source/kern_k_session_request.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 <mesosphere.hpp>
namespace ams::kern {
Result KSessionRequest::SessionMappings::PushMap(KProcessAddress client, KProcessAddress server, size_t size, KMemoryState state, size_t index) {
/* At most 15 buffers of each type (4-bit descriptor counts). */
MESOSPHERE_ASSERT(index < ((1ul << 4) - 1) * 3);
/* Get the mapping. */
Mapping *mapping;
if (index < NumStaticMappings) {
mapping = std::addressof(m_static_mappings[index]);
} else {
/* Allocate a page for the extra mappings. */
if (m_mappings == nullptr) {
KPageBuffer *page_buffer = KPageBuffer::Allocate();
R_UNLESS(page_buffer != nullptr, svc::ResultOutOfMemory());
m_mappings = reinterpret_cast<Mapping *>(page_buffer);
}
mapping = std::addressof(m_mappings[index - NumStaticMappings]);
}
/* Set the mapping. */
mapping->Set(client, server, size, state);
R_SUCCEED();
}
Result KSessionRequest::SessionMappings::PushSend(KProcessAddress client, KProcessAddress server, size_t size, KMemoryState state) {
MESOSPHERE_ASSERT(m_num_recv == 0);
MESOSPHERE_ASSERT(m_num_exch == 0);
R_RETURN(this->PushMap(client, server, size, state, m_num_send++));
}
Result KSessionRequest::SessionMappings::PushReceive(KProcessAddress client, KProcessAddress server, size_t size, KMemoryState state) {
MESOSPHERE_ASSERT(m_num_exch == 0);
R_RETURN(this->PushMap(client, server, size, state, m_num_send + m_num_recv++));
}
Result KSessionRequest::SessionMappings::PushExchange(KProcessAddress client, KProcessAddress server, size_t size, KMemoryState state) {
R_RETURN(this->PushMap(client, server, size, state, m_num_send + m_num_recv + m_num_exch++));
}
void KSessionRequest::SessionMappings::Finalize() {
if (m_mappings) {
KPageBuffer::Free(reinterpret_cast<KPageBuffer *>(m_mappings));
m_mappings = nullptr;
}
}
}