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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
125 lines
4.7 KiB
C++
125 lines
4.7 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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/* Static initializer. */
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void KDeviceAddressSpace::Initialize() {
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/* This just forwards to the device page table manager. */
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KDevicePageTable::Initialize();
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}
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/* Member functions. */
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Result KDeviceAddressSpace::Initialize(u64 address, u64 size) {
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MESOSPHERE_ASSERT_THIS();
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/* Initialize the device page table. */
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R_TRY(m_table.Initialize(address, size));
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/* Set member variables. */
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m_space_address = address;
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m_space_size = size;
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m_is_initialized = true;
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R_SUCCEED();
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}
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void KDeviceAddressSpace::Finalize() {
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MESOSPHERE_ASSERT_THIS();
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/* Finalize the table. */
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m_table.Finalize();
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}
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Result KDeviceAddressSpace::Attach(ams::svc::DeviceName device_name) {
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/* Lock the address space. */
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KScopedLightLock lk(m_lock);
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/* Attach. */
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R_RETURN(m_table.Attach(device_name, m_space_address, m_space_size));
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}
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Result KDeviceAddressSpace::Detach(ams::svc::DeviceName device_name) {
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/* Lock the address space. */
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KScopedLightLock lk(m_lock);
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/* Detach. */
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R_RETURN(m_table.Detach(device_name));
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}
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Result KDeviceAddressSpace::Map(KProcessPageTable *page_table, KProcessAddress process_address, size_t size, u64 device_address, ams::svc::MemoryPermission device_perm, bool is_aligned) {
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/* Check that the address falls within the space. */
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R_UNLESS((m_space_address <= device_address && device_address + size - 1 <= m_space_address + m_space_size - 1), svc::ResultInvalidCurrentMemory());
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/* Lock the address space. */
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KScopedLightLock lk(m_lock);
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/* Lock the page table to prevent concurrent device mapping operations. */
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KScopedLightLock pt_lk = page_table->AcquireDeviceMapLock();
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/* Lock the pages. */
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R_TRY(page_table->LockForMapDeviceAddressSpace(process_address, size, ConvertToKMemoryPermission(device_perm), is_aligned));
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/* Ensure that if we fail, we don't keep unmapped pages locked. */
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ON_RESULT_FAILURE { MESOSPHERE_R_ABORT_UNLESS(page_table->UnlockForDeviceAddressSpace(process_address, size)); };
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/* Map the pages. */
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{
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/* Perform the mapping. */
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R_TRY(m_table.Map(page_table, process_address, size, device_address, device_perm, is_aligned));
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/* Ensure that we unmap the pages if we fail to update the protections. */
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/* NOTE: Nintendo does not check the result of this unmap call. */
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ON_RESULT_FAILURE { m_table.Unmap(device_address, size); };
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/* Update the protections in accordance with how much we mapped. */
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R_TRY(page_table->UnlockForDeviceAddressSpacePartialMap(process_address, size));
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}
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/* We succeeded. */
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R_SUCCEED();
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}
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Result KDeviceAddressSpace::Unmap(KProcessPageTable *page_table, KProcessAddress process_address, size_t size, u64 device_address) {
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/* Check that the address falls within the space. */
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R_UNLESS((m_space_address <= device_address && device_address + size - 1 <= m_space_address + m_space_size - 1), svc::ResultInvalidCurrentMemory());
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/* Lock the address space. */
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KScopedLightLock lk(m_lock);
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/* Lock the page table to prevent concurrent device mapping operations. */
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KScopedLightLock pt_lk = page_table->AcquireDeviceMapLock();
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/* Lock the pages. */
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R_TRY(page_table->LockForUnmapDeviceAddressSpace(process_address, size));
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/* Unmap the pages. */
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{
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/* If we fail to unmap, we want to do a partial unlock. */
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ON_RESULT_FAILURE { MESOSPHERE_R_ABORT_UNLESS(page_table->UnlockForDeviceAddressSpacePartialMap(process_address, size)); };
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/* Perform the unmap. */
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R_TRY(m_table.Unmap(page_table, process_address, size, device_address));
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}
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/* Unlock the pages. */
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MESOSPHERE_R_ABORT_UNLESS(page_table->UnlockForDeviceAddressSpace(process_address, size));
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R_SUCCEED();
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}
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}
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