| // Copyright 2016 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef GARNET_LIB_MAGMA_SRC_MAGMA_UTIL_PLATFORM_PLATFORM_BUFFER_H_ |
| #define GARNET_LIB_MAGMA_SRC_MAGMA_UTIL_PLATFORM_PLATFORM_BUFFER_H_ |
| |
| #include "magma_common_defs.h" |
| #include "magma_util/dlog.h" |
| #include <memory> |
| |
| namespace magma { |
| |
| // In general only the const functions in this class must be implemented in a threadsafe way |
| class PlatformBuffer { |
| public: |
| static std::unique_ptr<PlatformBuffer> Create(uint64_t size, const char* name); |
| // Import takes ownership of the handle. |
| static std::unique_ptr<PlatformBuffer> Import(uint32_t handle); |
| |
| virtual ~PlatformBuffer() {} |
| |
| // Returns the size of the buffer. |
| virtual uint64_t size() const = 0; |
| |
| // Returns a unique, immutable id for the underlying memory object. |
| virtual uint64_t id() const = 0; |
| |
| // On success, duplicate of the underlying handle which is owned by the caller. |
| virtual bool duplicate_handle(uint32_t* handle_out) const = 0; |
| |
| // Ensures the specified pages are backed by real memory. |
| // note: the implementation of this function is required to be threadsafe. |
| virtual bool CommitPages(uint32_t start_page_index, uint32_t page_count) const = 0; |
| |
| // If |alignment| isn't 0, it must be a power of 2 and page-aligned. It's |
| // invalid to map the same buffer twice with different alignments. |
| virtual bool MapCpu(void** addr_out, uintptr_t alignment = 0) = 0; |
| virtual bool UnmapCpu() = 0; |
| |
| virtual bool MapAtCpuAddr(uint64_t addr, uint64_t offset, uint64_t length) = 0; |
| |
| virtual bool CleanCache(uint64_t offset, uint64_t size, bool invalidate) = 0; |
| |
| virtual bool SetCachePolicy(magma_cache_policy_t cache_policy) = 0; |
| |
| virtual magma_status_t GetCachePolicy(magma_cache_policy_t* cache_policy_out) = 0; |
| |
| static bool IdFromHandle(uint32_t handle, uint64_t* id_out); |
| |
| static uint64_t MinimumMappableAddress(); |
| }; |
| |
| } // namespace magma |
| |
| #endif // GARNET_LIB_MAGMA_SRC_MAGMA_UTIL_PLATFORM_PLATFORM_BUFFER_H_ |