Atmosphere/libraries/libmesosphere/source/kern_initial_process.cpp
2020-02-07 04:58:35 -08:00

75 lines
3.3 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 {
namespace {
KVirtualAddress GetInitialProcessBinaryAddress() {
return KMemoryLayout::GetPageTableHeapRegion().GetEndAddress() - InitialProcessBinarySizeMax;
}
void LoadInitialProcessBinaryHeader(InitialProcessBinaryHeader *header) {
if (header->magic != InitialProcessBinaryMagic) {
*header = *GetPointer<InitialProcessBinaryHeader>(GetInitialProcessBinaryAddress());
}
MESOSPHERE_ABORT_UNLESS(header->magic == InitialProcessBinaryMagic);
MESOSPHERE_ABORT_UNLESS(header->num_processes <= init::GetSlabResourceCounts().num_KProcess);
}
KVirtualAddress g_initial_process_binary_address;
InitialProcessBinaryHeader g_initial_process_binary_header;
u64 g_initial_process_id_min = std::numeric_limits<u64>::max();
u64 g_initial_process_id_max = std::numeric_limits<u64>::min();
}
u64 GetInitialProcessIdMin() {
return g_initial_process_id_min;
}
u64 GetInitialProcessIdMax() {
return g_initial_process_id_max;
}
void CopyInitialProcessBinaryToKernelMemory() {
LoadInitialProcessBinaryHeader(&g_initial_process_binary_header);
if (g_initial_process_binary_header.num_processes > 0) {
/* Reserve pages for the initial process binary from the system resource limit. */
auto &mm = Kernel::GetMemoryManager();
const size_t total_size = util::AlignUp(g_initial_process_binary_header.size, PageSize);
const size_t num_pages = total_size / PageSize;
MESOSPHERE_ABORT_UNLESS(Kernel::GetSystemResourceLimit().Reserve(ams::svc::LimitableResource_PhysicalMemoryMax, total_size));
/* Allocate memory for the image. */
const KMemoryManager::Pool pool = static_cast<KMemoryManager::Pool>(KSystemControl::GetInitialProcessBinaryPool());
const auto allocate_option = KMemoryManager::EncodeOption(pool, KMemoryManager::Direction_FromFront);
KVirtualAddress allocated_memory = mm.AllocateContinuous(num_pages, 1, allocate_option);
MESOSPHERE_ABORT_UNLESS(allocated_memory != Null<KVirtualAddress>);
mm.Open(allocated_memory, num_pages);
/* Relocate the image. */
std::memmove(GetVoidPointer(allocated_memory), GetVoidPointer(GetInitialProcessBinaryAddress()), g_initial_process_binary_header.size);
std::memset(GetVoidPointer(GetInitialProcessBinaryAddress()), 0, g_initial_process_binary_header.size);
g_initial_process_binary_address = allocated_memory;
}
}
}