mirror of https://github.com/F-Stack/f-stack.git
99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
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/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright(c) 2020 Dmitry Kozlyuk
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*/
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#include <stdint.h>
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#include <rte_compat.h>
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/**
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* @file
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* @internal
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*
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* Wrappers for OS facilities related to memory paging, used across DPDK.
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*/
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/** Memory protection flags. */
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enum rte_mem_prot {
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RTE_PROT_READ = 1 << 0, /**< Read access. */
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RTE_PROT_WRITE = 1 << 1, /**< Write access. */
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RTE_PROT_EXECUTE = 1 << 2 /**< Code execution. */
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};
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/** Additional flags for memory mapping. */
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enum rte_map_flags {
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/** Changes to the mapped memory are visible to other processes. */
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RTE_MAP_SHARED = 1 << 0,
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/** Mapping is not backed by a regular file. */
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RTE_MAP_ANONYMOUS = 1 << 1,
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/** Copy-on-write mapping, changes are invisible to other processes. */
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RTE_MAP_PRIVATE = 1 << 2,
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/**
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* Force mapping to the requested address. This flag should be used
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* with caution, because to fulfill the request implementation
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* may remove all other mappings in the requested region. However,
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* it is not required to do so, thus mapping with this flag may fail.
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*/
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RTE_MAP_FORCE_ADDRESS = 1 << 3
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};
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/**
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* Map a portion of an opened file or the page file into memory.
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*
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* This function is similar to POSIX mmap(3) with common MAP_ANONYMOUS
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* extension, except for the return value.
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*
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* @param requested_addr
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* Desired virtual address for mapping. Can be NULL to let OS choose.
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* @param size
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* Size of the mapping in bytes.
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* @param prot
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* Protection flags, a combination of rte_mem_prot values.
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* @param flags
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* Additional mapping flags, a combination of rte_map_flags.
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* @param fd
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* Mapped file descriptor. Can be negative for anonymous mapping.
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* @param offset
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* Offset of the mapped region in fd. Must be 0 for anonymous mappings.
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* @return
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* Mapped address or NULL on failure and rte_errno is set to OS error.
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*/
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__rte_internal
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void *
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rte_mem_map(void *requested_addr, size_t size, int prot, int flags,
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int fd, size_t offset);
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/**
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* OS-independent implementation of POSIX munmap(3).
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*/
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__rte_internal
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int
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rte_mem_unmap(void *virt, size_t size);
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/**
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* Get system page size. This function never fails.
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*
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* @return
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* Page size in bytes.
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*/
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__rte_internal
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size_t
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rte_mem_page_size(void);
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/**
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* Lock in physical memory all pages crossed by the address region.
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*
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* @param virt
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* Base virtual address of the region.
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* @param size
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* Size of the region.
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* @return
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* 0 on success, negative on error.
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*
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* @see rte_mem_page_size() to retrieve the page size.
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* @see rte_mem_lock_page() to lock an entire single page.
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*/
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__rte_internal
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int
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rte_mem_lock(const void *virt, size_t size);
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