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Atmosphere/troposphere/haze/source/ptp_object_heap.cpp
2023-10-16 08:36:10 -07:00

69 lines
2.1 KiB
C++

/*
* 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/>.
*/
#include <haze.hpp>
namespace haze {
namespace {
/* Allow 30MiB for use by libnx. */
static constexpr size_t LibnxReservedMemorySize = 30_MB;
}
void PtpObjectHeap::Initialize() {
/* If we're already initialized, skip re-initialization. */
if (m_heap_block_size != 0) {
return;
}
/* Estimate how much memory we can reserve. */
size_t mem_used = 0;
HAZE_R_ABORT_UNLESS(svcGetInfo(std::addressof(mem_used), InfoType_UsedMemorySize, svc::CurrentProcess, 0));
HAZE_ASSERT(mem_used > LibnxReservedMemorySize);
mem_used -= LibnxReservedMemorySize;
/* Calculate size of blocks. */
m_heap_block_size = mem_used / NumHeapBlocks;
HAZE_ASSERT(m_heap_block_size > 0);
/* Allocate the memory. */
for (size_t i = 0; i < NumHeapBlocks; i++) {
m_heap_blocks[i] = std::malloc(m_heap_block_size);
HAZE_ASSERT(m_heap_blocks[i] != nullptr);
}
/* Set the address to allocate from. */
m_next_address = m_heap_blocks[0];
}
void PtpObjectHeap::Finalize() {
if (m_heap_block_size == 0) {
return;
}
/* Tear down the heap, allowing a subsequent call to Initialize() if desired. */
for (size_t i = 0; i < NumHeapBlocks; i++) {
std::free(m_heap_blocks[i]);
m_heap_blocks[i] = nullptr;
}
m_next_address = nullptr;
m_heap_block_size = 0;
m_current_heap_block = 0;
}
}