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/*
* Copyright (c) 2017-2020 Advanced Micro Devices, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "sim/vma.hh"
#include <sys/mman.h>
#include <sys/stat.h>
#include "base/types.hh"
namespace gem5
{
void
VMA::fillMemPages(Addr start, Addr size, PortProxy &port) const
{
auto offset = start - _addrRange.start();
/**
* Try to copy a full page, but don't overrun the size of the file.
*/
if (offset < _hostBufLen) {
auto size = std::min(_hostBufLen - offset, _pageBytes);
port.writeBlob(start, (uint8_t*)_hostBuf + offset, size);
}
}
bool
VMA::isStrictSuperset(const AddrRange &r) const
{
return (r.start() > _addrRange.start() && r.end() < _addrRange.end());
}
void
VMA::sliceRegionRight(Addr slice_addr)
{
if (hasHostBuf()) {
auto nonoverlap_len = slice_addr - _addrRange.start();
_hostBufLen = std::min(_hostBufLen, nonoverlap_len);
}
_addrRange = AddrRange(_addrRange.start(), slice_addr);
DPRINTF(Vma, "slice right vma start %#x end %#x\n", _addrRange.start(),
_addrRange.end());
sanityCheck();
}
void
VMA::sliceRegionLeft(Addr slice_addr)
{
if (hasHostBuf()) {
auto overlap_len = slice_addr - _addrRange.start();
if (overlap_len >= _hostBufLen) {
_hostBufLen = 0;
_hostBuf = nullptr;
_origHostBuf = nullptr;
} else {
_hostBufLen -= overlap_len;
}
_hostBuf = (void *)((uint8_t *)_hostBuf + overlap_len);
}
_addrRange = AddrRange(slice_addr, _addrRange.end());
DPRINTF(Vma, "slice left vma start %#x end %#x\n", _addrRange.start(),
_addrRange.end());
sanityCheck();
}
void
VMA::sanityCheck()
{
/**
* Avoid regions without a length.
*/
assert(_addrRange.start() != _addrRange.end());
/**
* Avoid regions with an end point before the start point
*/
assert(_addrRange.start() < _addrRange.end());
/**
* Avoid non-aligned regions; we assume in the code that the
* regions are page aligned so consider this to be a bug.
*/
assert((_addrRange.start() % _pageBytes) == 0);
assert((_addrRange.end() % _pageBytes) == 0);
}
VMA::MappedFileBuffer::MappedFileBuffer(int fd, size_t length,
off_t offset)
: _buffer(nullptr), _length(length), _offset(offset)
{
panic_if(_length == 0, "Tried to mmap file of length zero");
struct stat file_stat;
if (fstat(fd, &file_stat) > 0) {
panic("Cannot stat file: %s\n", strerror(errno));
}
// Don't bother mapping more than the actual file size
panic_if(offset > file_stat.st_size,
"Tried to mmap with offset greater than file size");
_length = std::min((size_t)(file_stat.st_size - offset), _length);
// cannot call mmap with _length == 0
if (_length) {
_buffer = mmap(NULL, _length, PROT_READ,
MAP_PRIVATE, fd, offset);
if (_buffer == MAP_FAILED) {
panic("Failed to map file into host address space: %s",
strerror(errno));
}
} else {
panic("Tried to mmap 0 bytes");
}
}
VMA::MappedFileBuffer::~MappedFileBuffer()
{
if (_buffer) {
panic_if(munmap(_buffer, _length) == -1,
"mmap: failed to unmap file-backed host memory: %s",
strerror(errno));
}
}
} // namespace gem5