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https://github.com/Atmosphere-NX/Atmosphere.git
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96f95b9f95
* result: try out some experimental shenanigans * result: sketch out some more shenanigans * result: see what it looks like to convert kernel to use result conds instead of guards * make rest of kernel use experimental new macro-ing
113 lines
4.0 KiB
C++
113 lines
4.0 KiB
C++
/*
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* Copyright (c) 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 <mesosphere.hpp>
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namespace ams::kern {
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Result KTransferMemory::Initialize(KProcessAddress addr, size_t size, ams::svc::MemoryPermission own_perm) {
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MESOSPHERE_ASSERT_THIS();
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/* Set members. */
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m_owner = GetCurrentProcessPointer();
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/* Get the owner page table. */
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auto &page_table = m_owner->GetPageTable();
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/* Construct the page group, guarding to make sure our state is valid on exit. */
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auto pg_guard = util::ConstructAtGuarded(m_page_group, page_table.GetBlockInfoManager());
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/* Lock the memory. */
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R_TRY(page_table.LockForTransferMemory(GetPointer(m_page_group), addr, size, ConvertToKMemoryPermission(own_perm)));
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/* Set remaining tracking members. */
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m_owner->Open();
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m_owner_perm = own_perm;
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m_address = addr;
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m_is_initialized = true;
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m_is_mapped = false;
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/* We succeeded. */
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pg_guard.Cancel();
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R_SUCCEED();
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}
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void KTransferMemory::Finalize() {
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MESOSPHERE_ASSERT_THIS();
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/* Unlock. */
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if (!m_is_mapped) {
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const size_t size = GetReference(m_page_group).GetNumPages() * PageSize;
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MESOSPHERE_R_ABORT_UNLESS(m_owner->GetPageTable().UnlockForTransferMemory(m_address, size, GetReference(m_page_group)));
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}
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/* Close the page group. */
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GetReference(m_page_group).Close();
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GetReference(m_page_group).Finalize();
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}
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void KTransferMemory::PostDestroy(uintptr_t arg) {
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KProcess *owner = reinterpret_cast<KProcess *>(arg);
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owner->ReleaseResource(ams::svc::LimitableResource_TransferMemoryCountMax, 1);
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owner->Close();
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}
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Result KTransferMemory::Map(KProcessAddress address, size_t size, ams::svc::MemoryPermission map_perm) {
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MESOSPHERE_ASSERT_THIS();
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/* Validate the size. */
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R_UNLESS(GetReference(m_page_group).GetNumPages() == util::DivideUp(size, PageSize), svc::ResultInvalidSize());
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/* Validate the permission. */
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R_UNLESS(m_owner_perm == map_perm, svc::ResultInvalidState());
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/* Lock ourselves. */
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KScopedLightLock lk(m_lock);
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/* Ensure we're not already mapped. */
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R_UNLESS(!m_is_mapped, svc::ResultInvalidState());
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/* Map the memory. */
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const KMemoryState state = (m_owner_perm == ams::svc::MemoryPermission_None) ? KMemoryState_Transfered : KMemoryState_SharedTransfered;
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R_TRY(GetCurrentProcess().GetPageTable().MapPageGroup(address, GetReference(m_page_group), state, KMemoryPermission_UserReadWrite));
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/* Mark ourselves as mapped. */
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m_is_mapped = true;
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R_SUCCEED();
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}
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Result KTransferMemory::Unmap(KProcessAddress address, size_t size) {
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MESOSPHERE_ASSERT_THIS();
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/* Validate the size. */
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R_UNLESS(GetReference(m_page_group).GetNumPages() == util::DivideUp(size, PageSize), svc::ResultInvalidSize());
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/* Lock ourselves. */
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KScopedLightLock lk(m_lock);
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/* Unmap the memory. */
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const KMemoryState state = (m_owner_perm == ams::svc::MemoryPermission_None) ? KMemoryState_Transfered : KMemoryState_SharedTransfered;
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R_TRY(GetCurrentProcess().GetPageTable().UnmapPageGroup(address, GetReference(m_page_group), state));
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/* Mark ourselves as unmapped. */
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MESOSPHERE_ASSERT(m_is_mapped);
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m_is_mapped = false;
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R_SUCCEED();
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}
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}
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