mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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113 lines
4.7 KiB
C++
113 lines
4.7 KiB
C++
/*
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* Copyright (c) 2018-2020 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::svc {
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/* ============================= Common ============================= */
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namespace {
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Result QueryIoMapping(uintptr_t *out_address, size_t *out_size, uint64_t phys_addr, size_t size) {
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/* Declare variables we'll populate. */
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KProcessAddress found_address = Null<KProcessAddress>;
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size_t found_size = 0;
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/* Get reference to page table. */
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auto &pt = GetCurrentProcess().GetPageTable();
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/* Check whether the address is aligned. */
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const bool aligned = util::IsAligned(phys_addr, PageSize);
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if (aligned) {
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/* The size must be non-zero. */
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R_UNLESS(size > 0, svc::ResultInvalidSize());
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/* The request must not overflow. */
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R_UNLESS((phys_addr < phys_addr + size), svc::ResultNotFound());
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/* Query the mapping. */
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R_TRY(pt.QueryIoMapping(std::addressof(found_address), phys_addr, size));
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/* Use the size as the found size. */
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found_size = size;
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} else {
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/* TODO: Older kernel ABI compatibility. */
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/* Newer kernel only allows unaligned addresses when they're special enum members. */
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R_UNLESS(phys_addr < PageSize, svc::ResultNotFound());
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/* Try to find the memory region. */
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const KMemoryRegion *region;
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switch (static_cast<ams::svc::MemoryRegionType>(phys_addr)) {
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case ams::svc::MemoryRegionType_KernelTraceBuffer:
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region = KMemoryLayout::TryGetKernelTraceBufferRegion();
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break;
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case ams::svc::MemoryRegionType_OnMemoryBootImage:
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region = KMemoryLayout::TryGetOnMemoryBootImageRegion();
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break;
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case ams::svc::MemoryRegionType_DTB:
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region = KMemoryLayout::TryGetDTBRegion();
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break;
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default:
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region = nullptr;
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break;
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}
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/* Ensure that we found the region. */
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R_UNLESS(region != nullptr, svc::ResultNotFound());
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R_TRY(pt.QueryStaticMapping(std::addressof(found_address), region->GetAddress(), region->GetSize()));
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found_size = region->GetSize();
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}
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/* We succeeded. */
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MESOSPHERE_ASSERT(found_address != Null<KProcessAddress>);
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MESOSPHERE_ASSERT(found_size != 0);
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if (out_address != nullptr) {
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*out_address = GetInteger(found_address);
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}
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if (out_size != nullptr) {
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*out_size = found_size;
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}
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return ResultSuccess();
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}
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}
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/* ============================= 64 ABI ============================= */
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Result QueryPhysicalAddress64(ams::svc::lp64::PhysicalMemoryInfo *out_info, ams::svc::Address address) {
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MESOSPHERE_PANIC("Stubbed SvcQueryPhysicalAddress64 was called.");
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}
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Result QueryIoMapping64(ams::svc::Address *out_address, ams::svc::PhysicalAddress physical_address, ams::svc::Size size) {
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static_assert(sizeof(*out_address) == sizeof(uintptr_t));
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return QueryIoMapping(reinterpret_cast<uintptr_t *>(out_address), nullptr, physical_address, size);
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}
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/* ============================= 64From32 ABI ============================= */
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Result QueryPhysicalAddress64From32(ams::svc::ilp32::PhysicalMemoryInfo *out_info, ams::svc::Address address) {
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MESOSPHERE_PANIC("Stubbed SvcQueryPhysicalAddress64From32 was called.");
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}
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Result QueryIoMapping64From32(ams::svc::Address *out_address, ams::svc::PhysicalAddress physical_address, ams::svc::Size size) {
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static_assert(sizeof(*out_address) == sizeof(uintptr_t));
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return QueryIoMapping(reinterpret_cast<uintptr_t *>(out_address), nullptr, physical_address, size);
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}
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}
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