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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40284755): Remove this and spanify to fix the errors.
#pragma allow_unsafe_buffers
#endif
#include "base/memory/platform_shared_memory_mapper.h"
#include <lib/zx/vmar.h>
#include "base/fuchsia/fuchsia_logging.h"
#include "base/logging.h"
namespace base {
std::optional<span<uint8_t>> PlatformSharedMemoryMapper::Map(
subtle::PlatformSharedMemoryHandle handle,
bool write_allowed,
uint64_t offset,
size_t size) {
uintptr_t addr;
zx_vm_option_t options = ZX_VM_REQUIRE_NON_RESIZABLE | ZX_VM_PERM_READ;
if (write_allowed) {
options |= ZX_VM_PERM_WRITE;
}
zx_status_t status = zx::vmar::root_self()->map(options, /*vmar_offset=*/0,
*handle, offset, size, &addr);
if (status != ZX_OK) {
ZX_DLOG(ERROR, status) << "zx_vmar_map";
return std::nullopt;
}
return span(reinterpret_cast<uint8_t*>(addr), size);
}
void PlatformSharedMemoryMapper::Unmap(span<uint8_t> mapping) {
uintptr_t addr = reinterpret_cast<uintptr_t>(mapping.data());
zx_status_t status = zx::vmar::root_self()->unmap(addr, mapping.size());
if (status != ZX_OK) {
ZX_DLOG(ERROR, status) << "zx_vmar_unmap";
}
}
} // namespace base
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