mirror of
https://github.com/Atmosphere-NX/Atmosphere-libs.git
synced 2025-10-11 03:37:08 +02:00
75 lines
2.7 KiB
C++
75 lines
2.7 KiB
C++
/*
|
|
* Copyright (c) 2018-2020 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::arch::arm64 {
|
|
|
|
void KPageTableImpl::InitializeForKernel(void *tb, KVirtualAddress start, KVirtualAddress end) {
|
|
this->table = static_cast<L1PageTableEntry *>(tb);
|
|
this->is_kernel = true;
|
|
this->num_entries = util::AlignUp(end - start, L1BlockSize) / L1BlockSize;
|
|
}
|
|
|
|
L1PageTableEntry *KPageTableImpl::Finalize() {
|
|
return this->table;
|
|
}
|
|
|
|
bool KPageTableImpl::GetPhysicalAddress(KPhysicalAddress *out, KProcessAddress address) const {
|
|
/* Validate that we can read the actual entry. */
|
|
const size_t l0_index = GetL0Index(address);
|
|
const size_t l1_index = GetL1Index(address);
|
|
if (this->is_kernel) {
|
|
/* Kernel entries must be accessed via TTBR1. */
|
|
if ((l0_index != MaxPageTableEntries - 1) || (l1_index < MaxPageTableEntries - this->num_entries)) {
|
|
return false;
|
|
}
|
|
} else {
|
|
/* User entries must be accessed with TTBR0. */
|
|
if ((l0_index != 0) || l1_index >= this->num_entries) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/* Try to get from l1 table. */
|
|
const L1PageTableEntry *l1_entry = this->GetL1Entry(address);
|
|
if (l1_entry->IsBlock()) {
|
|
*out = l1_entry->GetBlock() + GetL1Offset(address);
|
|
return true;
|
|
} else if (!l1_entry->IsTable()) {
|
|
return false;
|
|
}
|
|
|
|
/* Try to get from l2 table. */
|
|
const L2PageTableEntry *l2_entry = this->GetL2Entry(l1_entry, address);
|
|
if (l2_entry->IsBlock()) {
|
|
*out = l2_entry->GetBlock() + GetL2Offset(address);
|
|
return true;
|
|
} else if (!l2_entry->IsTable()) {
|
|
return false;
|
|
}
|
|
|
|
/* Try to get from l3 table. */
|
|
const L3PageTableEntry *l3_entry = this->GetL3Entry(l2_entry, address);
|
|
if (l3_entry->IsBlock()) {
|
|
*out = l3_entry->GetBlock() + GetL3Offset(address);
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
}
|