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https://github.com/Atmosphere-NX/Atmosphere
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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
106 lines
4 KiB
C++
106 lines
4 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 KSharedMemory::Initialize(KProcess *owner, size_t size, ams::svc::MemoryPermission own_perm, ams::svc::MemoryPermission rem_perm) {
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MESOSPHERE_ASSERT_THIS();
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/* Set members. */
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m_owner_process_id = owner->GetId();
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m_owner_perm = own_perm;
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m_remote_perm = rem_perm;
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/* Get the number of pages. */
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const size_t num_pages = util::DivideUp(size, PageSize);
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MESOSPHERE_ASSERT(num_pages > 0);
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/* Get the resource limit. */
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KResourceLimit *reslimit = owner->GetResourceLimit();
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/* Reserve memory for ourselves. */
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KScopedResourceReservation memory_reservation(reslimit, ams::svc::LimitableResource_PhysicalMemoryMax, size);
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R_UNLESS(memory_reservation.Succeeded(), svc::ResultLimitReached());
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/* Allocate the memory. */
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R_TRY(Kernel::GetMemoryManager().AllocateAndOpen(std::addressof(m_page_group), num_pages, owner->GetAllocateOption()));
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/* Commit our reservation. */
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memory_reservation.Commit();
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/* Set our resource limit. */
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m_resource_limit = reslimit;
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m_resource_limit->Open();
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/* Mark initialized. */
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m_is_initialized = true;
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/* Clear all pages in the memory. */
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for (const auto &block : m_page_group) {
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std::memset(GetVoidPointer(KMemoryLayout::GetLinearVirtualAddress(block.GetAddress())), 0, block.GetSize());
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}
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R_SUCCEED();
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}
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void KSharedMemory::Finalize() {
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MESOSPHERE_ASSERT_THIS();
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/* Get the number of pages. */
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const size_t num_pages = m_page_group.GetNumPages();
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const size_t size = num_pages * PageSize;
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/* Close and finalize the page group. */
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m_page_group.Close();
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m_page_group.Finalize();
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/* Release the memory reservation. */
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m_resource_limit->Release(ams::svc::LimitableResource_PhysicalMemoryMax, size);
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m_resource_limit->Close();
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}
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Result KSharedMemory::Map(KProcessPageTable *table, KProcessAddress address, size_t size, KProcess *process, 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(m_page_group.GetNumPages() == util::DivideUp(size, PageSize), svc::ResultInvalidSize());
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/* Validate the permission. */
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const ams::svc::MemoryPermission test_perm = (process->GetId() == m_owner_process_id) ? m_owner_perm : m_remote_perm;
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if (test_perm == ams::svc::MemoryPermission_DontCare) {
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MESOSPHERE_ASSERT(map_perm == ams::svc::MemoryPermission_Read || map_perm == ams::svc::MemoryPermission_ReadWrite);
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} else {
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R_UNLESS(map_perm == test_perm, svc::ResultInvalidNewMemoryPermission());
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}
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/* Map the memory. */
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R_RETURN(table->MapPageGroup(address, m_page_group, KMemoryState_Shared, ConvertToKMemoryPermission(map_perm)));
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}
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Result KSharedMemory::Unmap(KProcessPageTable *table, KProcessAddress address, size_t size, KProcess *process) {
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MESOSPHERE_ASSERT_THIS();
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MESOSPHERE_UNUSED(process);
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/* Validate the size. */
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R_UNLESS(m_page_group.GetNumPages() == util::DivideUp(size, PageSize), svc::ResultInvalidSize());
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/* Unmap the memory. */
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R_RETURN(table->UnmapPageGroup(address, m_page_group, KMemoryState_Shared));
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}
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}
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