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- // Copyright 2022 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #include "base/memory/platform_shared_memory_mapper.h"
- #include "base/logging.h"
- #include <lib/zx/vmar.h>
- #include "base/fuchsia/fuchsia_logging.h"
- namespace base {
- absl::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 absl::nullopt;
- }
- return make_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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