Atmosphere/libraries/libstratosphere/source/os/impl/os_vamm_manager_impl.os.linux.hpp

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/*
* Copyright (c) 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/>.
*/
#pragma once
#include <stratosphere.hpp>
#include <sys/mman.h>
namespace ams::os::impl {
class VammManagerLinuxImpl {
public:
static void GetReservedRegionImpl(uintptr_t *out_start, uintptr_t *out_size) {
/* Reserve a 64 GB region of virtual address space. */
constexpr size_t ReservedRegionSize = 64_GB;
const auto reserved = ::mmap(nullptr, ReservedRegionSize, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
AMS_ABORT_UNLESS(reserved != MAP_FAILED);
*out_start = reinterpret_cast<uintptr_t>(reserved);
*out_size = ReservedRegionSize;
}
static Result AllocatePhysicalMemoryImpl(uintptr_t address, size_t size) {
R_UNLESS(::mprotect(reinterpret_cast<void *>(address), size, PROT_READ | PROT_WRITE) == 0, os::ResultOutOfMemory());
R_SUCCEED();
}
static Result FreePhysicalMemoryImpl(uintptr_t address, size_t size) {
const auto reserved = ::mmap(reinterpret_cast<void *>(address), size, PROT_NONE, MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
R_UNLESS(reserved != MAP_FAILED, os::ResultBusy());
R_SUCCEED();
}
static consteval size_t GetExtraSystemResourceAssignedSize() {
return 0;
}
static consteval size_t GetExtraSystemResourceUsedSize() {
return 0;
}
static consteval bool IsVirtualAddressMemoryEnabled() {
return true;
}
};
using VammManagerImpl = VammManagerLinuxImpl;
}