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/*
* Copyright (C) 2019-2020 Intel Corporation
*
* SPDX-License-Identifier: MIT
*
*/
#include "shared/source/os_interface/linux/os_memory_linux.h"
#include "shared/source/os_interface/linux/os_inc.h"
#include <cinttypes>
#include <fstream>
#include <string>
namespace NEO {
std::unique_ptr<OSMemory> OSMemory::create() {
return std::make_unique<OSMemoryLinux>();
}
void *OSMemoryLinux::osReserveCpuAddressRange(void *baseAddress, size_t sizeToReserve) {
return mmapWrapper(baseAddress, sizeToReserve, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE, -1, 0);
}
void OSMemoryLinux::osReleaseCpuAddressRange(void *reservedCpuAddressRange, size_t reservedSize) {
munmapWrapper(reservedCpuAddressRange, reservedSize);
}
void *OSMemoryLinux::mmapWrapper(void *addr, size_t size, int prot, int flags, int fd, off_t off) {
return mmap(addr, size, prot, flags, fd, off);
}
int OSMemoryLinux::munmapWrapper(void *addr, size_t size) {
return munmap(addr, size);
}
void OSMemoryLinux::getMemoryMaps(MemoryMaps &memoryMaps) {
/*
============ ===============================================================
The /proc/PID/maps file contains the currently mapped memory regions and
their access permissions.
The format is::
address perms offset dev inode pathname
08048000-08049000 r-xp 00000000 03:00 8312 /opt/test
*/
std::ifstream ifs(std::string(Os::sysFsProcPathPrefix) + "/self/maps");
std::string line;
while (std::getline(ifs, line)) {
uint64_t start = 0, end = 0;
sscanf(line.c_str(), "%" SCNx64 "-%" SCNx64, &start, &end);
memoryMaps.push_back({start, end});
}
}
} // namespace NEO
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