mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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344 lines
18 KiB
C++
344 lines
18 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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namespace {
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struct InitialProcessInfo {
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KProcess *process;
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size_t stack_size;
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s32 priority;
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};
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constinit KPhysicalAddress g_initial_process_binary_phys_addr = Null<KPhysicalAddress>;
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constinit KVirtualAddress g_initial_process_binary_address = Null<KVirtualAddress>;
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constinit InitialProcessBinaryHeader g_initial_process_binary_header = {};
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constinit size_t g_initial_process_secure_memory_size = 0;
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constinit u64 g_initial_process_id_min = std::numeric_limits<u64>::max();
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constinit u64 g_initial_process_id_max = std::numeric_limits<u64>::min();
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void LoadInitialProcessBinaryHeader() {
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if (g_initial_process_binary_header.magic != InitialProcessBinaryMagic) {
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/* Get the virtual address. */
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MESOSPHERE_INIT_ABORT_UNLESS(g_initial_process_binary_phys_addr != Null<KPhysicalAddress>);
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const KVirtualAddress virt_addr = KMemoryLayout::GetLinearVirtualAddress(g_initial_process_binary_phys_addr);
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/* Copy and validate the header. */
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g_initial_process_binary_header = *GetPointer<InitialProcessBinaryHeader>(virt_addr);
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MESOSPHERE_ABORT_UNLESS(g_initial_process_binary_header.magic == InitialProcessBinaryMagic);
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MESOSPHERE_ABORT_UNLESS(g_initial_process_binary_header.num_processes <= init::GetSlabResourceCounts().num_KProcess);
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/* Set the image address. */
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g_initial_process_binary_address = virt_addr;
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/* Process/calculate the secure memory size. */
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KVirtualAddress current = g_initial_process_binary_address + sizeof(InitialProcessBinaryHeader);
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const KVirtualAddress end = g_initial_process_binary_address + g_initial_process_binary_header.size;
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const size_t num_processes = g_initial_process_binary_header.num_processes;
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for (size_t i = 0; i < num_processes; ++i) {
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/* Validate that we can read the current KIP. */
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MESOSPHERE_ABORT_UNLESS(current <= end - sizeof(KInitialProcessHeader));
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/* Attach to the current KIP. */
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KInitialProcessReader reader;
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KVirtualAddress data = reader.Attach(current);
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MESOSPHERE_ABORT_UNLESS(data != Null<KVirtualAddress>);
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/* If the process uses secure memory, account for that. */
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if (reader.UsesSecureMemory()) {
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g_initial_process_secure_memory_size += reader.GetSize() + util::AlignUp(reader.GetStackSize(), PageSize);
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}
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/* Advance to the next KIP. */
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current = data + reader.GetBinarySize();
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}
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}
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}
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void CreateProcesses(InitialProcessInfo *infos) {
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/* Determine process image extents. */
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KVirtualAddress current = g_initial_process_binary_address + sizeof(InitialProcessBinaryHeader);
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KVirtualAddress end = g_initial_process_binary_address + g_initial_process_binary_header.size;
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/* Decide on pools to use. */
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const auto unsafe_pool = static_cast<KMemoryManager::Pool>(KSystemControl::GetCreateProcessMemoryPool());
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const auto secure_pool = (GetTargetFirmware() >= TargetFirmware_2_0_0) ? KMemoryManager::Pool_Secure : unsafe_pool;
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const size_t num_processes = g_initial_process_binary_header.num_processes;
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for (size_t i = 0; i < num_processes; ++i) {
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/* Validate that we can read the current KIP header. */
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MESOSPHERE_ABORT_UNLESS(current <= end - sizeof(KInitialProcessHeader));
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/* Attach to the current kip. */
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KInitialProcessReader reader;
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KVirtualAddress data = reader.Attach(current);
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MESOSPHERE_ABORT_UNLESS(data != Null<KVirtualAddress>);
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/* Ensure that the remainder of our parse is page aligned. */
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if (!util::IsAligned(GetInteger(data), PageSize)) {
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const KVirtualAddress aligned_data = util::AlignDown(GetInteger(data), PageSize);
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std::memmove(GetVoidPointer(aligned_data), GetVoidPointer(data), end - data);
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data = aligned_data;
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end -= (data - aligned_data);
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}
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/* If we crossed a page boundary, free the pages we're done using. */
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if (KVirtualAddress aligned_current = util::AlignDown(GetInteger(current), PageSize); aligned_current != data) {
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const size_t freed_size = data - aligned_current;
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Kernel::GetMemoryManager().Close(KMemoryLayout::GetLinearPhysicalAddress(aligned_current), freed_size / PageSize);
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Kernel::GetSystemResourceLimit().Release(ams::svc::LimitableResource_PhysicalMemoryMax, freed_size);
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}
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/* Parse process parameters. */
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ams::svc::CreateProcessParameter params;
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MESOSPHERE_R_ABORT_UNLESS(reader.MakeCreateProcessParameter(std::addressof(params), true));
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/* Get the binary size for the kip. */
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const size_t binary_size = reader.GetBinarySize();
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const size_t binary_pages = binary_size / PageSize;
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/* Get the pool for both the current (compressed) image, and the decompressed process. */
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const auto src_pool = Kernel::GetMemoryManager().GetPool(KMemoryLayout::GetLinearPhysicalAddress(data));
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const auto dst_pool = reader.UsesSecureMemory() ? secure_pool : unsafe_pool;
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/* Determine the process size, and how much memory isn't already reserved. */
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const size_t process_size = params.code_num_pages * PageSize;
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const size_t unreserved_size = process_size - (src_pool == dst_pool ? util::AlignDown(binary_size, PageSize) : 0);
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/* Reserve however much memory we need to reserve. */
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MESOSPHERE_ABORT_UNLESS(Kernel::GetSystemResourceLimit().Reserve(ams::svc::LimitableResource_PhysicalMemoryMax, unreserved_size));
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/* Create the process. */
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KProcess *new_process = nullptr;
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{
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/* Make page groups to represent the data. */
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KPageGroup pg(Kernel::GetSystemSystemResource().GetBlockInfoManagerPointer());
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KPageGroup workaround_pg(Kernel::GetSystemSystemResource().GetBlockInfoManagerPointer());
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/* Populate the page group to represent the data. */
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{
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/* Allocate the previously unreserved pages. */
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KPageGroup unreserve_pg(Kernel::GetSystemSystemResource().GetBlockInfoManagerPointer());
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MESOSPHERE_R_ABORT_UNLESS(Kernel::GetMemoryManager().AllocateAndOpen(std::addressof(unreserve_pg), unreserved_size / PageSize, KMemoryManager::EncodeOption(dst_pool, KMemoryManager::Direction_FromFront)));
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/* Add the previously reserved pages. */
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if (src_pool == dst_pool && binary_pages != 0) {
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/* NOTE: Nintendo does not check the result of this operation. */
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pg.AddBlock(KMemoryLayout::GetLinearPhysicalAddress(data), binary_pages);
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}
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/* Add the previously unreserved pages. */
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for (const auto &block : unreserve_pg) {
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/* NOTE: Nintendo does not check the result of this operation. */
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pg.AddBlock(block.GetAddress(), block.GetNumPages());
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}
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}
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MESOSPHERE_ABORT_UNLESS(pg.GetNumPages() == static_cast<size_t>(params.code_num_pages));
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/* Ensure that we do not leak pages. */
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KPageGroup *process_pg = std::addressof(pg);
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ON_SCOPE_EXIT { process_pg->Close(); };
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/* Get the temporary region. */
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const auto &temp_region = KMemoryLayout::GetTempRegion();
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MESOSPHERE_ABORT_UNLESS(temp_region.GetEndAddress() != 0);
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/* Map the process's memory into the temporary region. */
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KProcessAddress temp_address = Null<KProcessAddress>;
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MESOSPHERE_R_ABORT_UNLESS(Kernel::GetKernelPageTable().MapPageGroup(std::addressof(temp_address), pg, temp_region.GetAddress(), temp_region.GetSize() / PageSize, KMemoryState_Kernel, KMemoryPermission_KernelReadWrite));
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/* Setup the new page group's memory, so that we can load the process. */
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{
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/* Copy the unaligned ending of the compressed binary. */
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if (const size_t unaligned_size = binary_size - util::AlignDown(binary_size, PageSize); unaligned_size != 0) {
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std::memcpy(GetVoidPointer(temp_address + process_size - unaligned_size), GetVoidPointer(data + binary_size - unaligned_size), unaligned_size);
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}
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/* Copy the aligned part of the compressed binary. */
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if (const size_t aligned_size = util::AlignDown(binary_size, PageSize); aligned_size != 0 && src_pool == dst_pool) {
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std::memmove(GetVoidPointer(temp_address + process_size - binary_size), GetVoidPointer(temp_address), aligned_size);
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} else {
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if (src_pool != dst_pool) {
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std::memcpy(GetVoidPointer(temp_address + process_size - binary_size), GetVoidPointer(data), aligned_size);
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Kernel::GetMemoryManager().Close(KMemoryLayout::GetLinearPhysicalAddress(data), aligned_size / PageSize);
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}
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}
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/* Clear the first part of the memory. */
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std::memset(GetVoidPointer(temp_address), 0, process_size - binary_size);
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}
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/* Load the process. */
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MESOSPHERE_R_ABORT_UNLESS(reader.Load(temp_address, params, temp_address + process_size - binary_size));
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/* Unmap the temporary mapping. */
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MESOSPHERE_R_ABORT_UNLESS(Kernel::GetKernelPageTable().UnmapPageGroup(temp_address, pg, KMemoryState_Kernel));
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/* Create a KProcess object. */
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new_process = KProcess::Create();
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MESOSPHERE_ABORT_UNLESS(new_process != nullptr);
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/* Ensure the page group is usable for the process. */
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/* If the pool is the same, we need to use the workaround page group. */
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if (src_pool == dst_pool) {
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/* Allocate a new, usable group for the process. */
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MESOSPHERE_R_ABORT_UNLESS(Kernel::GetMemoryManager().AllocateAndOpen(std::addressof(workaround_pg), static_cast<size_t>(params.code_num_pages), KMemoryManager::EncodeOption(dst_pool, KMemoryManager::Direction_FromFront)));
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/* Copy data from the working page group to the usable one. */
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auto work_it = pg.begin();
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MESOSPHERE_ABORT_UNLESS(work_it != pg.end());
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{
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auto work_address = work_it->GetAddress();
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auto work_remaining = work_it->GetNumPages();
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for (const auto &block : workaround_pg) {
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auto block_address = block.GetAddress();
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auto block_remaining = block.GetNumPages();
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while (block_remaining > 0) {
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if (work_remaining == 0) {
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++work_it;
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work_address = work_it->GetAddress();
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work_remaining = work_it->GetNumPages();
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}
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const size_t cur_pages = std::min(block_remaining, work_remaining);
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const size_t cur_size = cur_pages * PageSize;
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std::memcpy(GetVoidPointer(KMemoryLayout::GetLinearVirtualAddress(block_address)), GetVoidPointer(KMemoryLayout::GetLinearVirtualAddress(work_address)), cur_size);
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block_address += cur_size;
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work_address += cur_size;
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block_remaining -= cur_pages;
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work_remaining -= cur_pages;
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}
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}
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++work_it;
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}
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MESOSPHERE_ABORT_UNLESS(work_it == pg.end());
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/* We want to use the new page group. */
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process_pg = std::addressof(workaround_pg);
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pg.Close();
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}
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/* Initialize the process. */
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MESOSPHERE_R_ABORT_UNLESS(new_process->Initialize(params, *process_pg, reader.GetCapabilities(), reader.GetNumCapabilities(), std::addressof(Kernel::GetSystemResourceLimit()), dst_pool, reader.IsImmortal()));
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}
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/* Release the memory that was previously reserved. */
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if (const size_t aligned_bin_size = util::AlignDown(binary_size, PageSize); aligned_bin_size != 0 && src_pool != dst_pool) {
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Kernel::GetSystemResourceLimit().Release(ams::svc::LimitableResource_PhysicalMemoryMax, aligned_bin_size);
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}
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/* Set the process's memory permissions. */
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MESOSPHERE_R_ABORT_UNLESS(reader.SetMemoryPermissions(new_process->GetPageTable(), params));
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/* Register the process. */
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KProcess::Register(new_process);
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/* Set the ideal core id. */
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new_process->SetIdealCoreId(reader.GetIdealCoreId());
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/* Save the process info. */
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infos[i].process = new_process;
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infos[i].stack_size = reader.GetStackSize();
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infos[i].priority = reader.GetPriority();
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/* Advance the reader. */
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current = data + binary_size;
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}
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/* Release remaining memory used by the image. */
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{
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const size_t remaining_size = util::AlignUp(GetInteger(g_initial_process_binary_address) + g_initial_process_binary_header.size, PageSize) - util::AlignDown(GetInteger(current), PageSize);
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const size_t remaining_pages = remaining_size / PageSize;
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Kernel::GetMemoryManager().Close(KMemoryLayout::GetLinearPhysicalAddress(util::AlignDown(GetInteger(current), PageSize)), remaining_pages);
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Kernel::GetSystemResourceLimit().Release(ams::svc::LimitableResource_PhysicalMemoryMax, remaining_size);
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}
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}
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}
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void SetInitialProcessBinaryPhysicalAddress(KPhysicalAddress phys_addr) {
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MESOSPHERE_INIT_ABORT_UNLESS(g_initial_process_binary_phys_addr == Null<KPhysicalAddress>);
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g_initial_process_binary_phys_addr = phys_addr;
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}
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KPhysicalAddress GetInitialProcessBinaryPhysicalAddress() {
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MESOSPHERE_INIT_ABORT_UNLESS(g_initial_process_binary_phys_addr != Null<KPhysicalAddress>);
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return g_initial_process_binary_phys_addr;
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}
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u64 GetInitialProcessIdMin() {
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return g_initial_process_id_min;
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}
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u64 GetInitialProcessIdMax() {
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return g_initial_process_id_max;
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}
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size_t GetInitialProcessesSecureMemorySize() {
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LoadInitialProcessBinaryHeader();
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return g_initial_process_secure_memory_size;
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}
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size_t CopyInitialProcessBinaryToKernelMemory() {
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LoadInitialProcessBinaryHeader();
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if (g_initial_process_binary_header.num_processes > 0) {
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/* Reserve pages for the initial process binary from the system resource limit. */
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const size_t total_size = util::AlignUp(g_initial_process_binary_header.size, PageSize);
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MESOSPHERE_ABORT_UNLESS(Kernel::GetSystemResourceLimit().Reserve(ams::svc::LimitableResource_PhysicalMemoryMax, total_size));
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/* The initial process binary is potentially over-allocated, so free any extra pages. */
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if (total_size < InitialProcessBinarySizeMax) {
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Kernel::GetMemoryManager().Close(KMemoryLayout::GetLinearPhysicalAddress(g_initial_process_binary_address + total_size), (InitialProcessBinarySizeMax - total_size) / PageSize);
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}
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return total_size;
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} else {
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return 0;
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}
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}
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void CreateAndRunInitialProcesses() {
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/* Allocate space for the processes. */
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InitialProcessInfo *infos = static_cast<InitialProcessInfo *>(__builtin_alloca(sizeof(InitialProcessInfo) * g_initial_process_binary_header.num_processes));
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/* Create the processes. */
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CreateProcesses(infos);
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/* Determine the initial process id range. */
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for (size_t i = 0; i < g_initial_process_binary_header.num_processes; i++) {
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const auto pid = infos[i].process->GetId();
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g_initial_process_id_min = std::min(g_initial_process_id_min, pid);
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g_initial_process_id_max = std::max(g_initial_process_id_max, pid);
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}
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/* Run the processes. */
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for (size_t i = 0; i < g_initial_process_binary_header.num_processes; i++) {
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MESOSPHERE_R_ABORT_UNLESS(infos[i].process->Run(infos[i].priority, infos[i].stack_size));
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infos[i].process->Close();
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}
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}
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}
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