| /* |
| * Copyright (c) 2016-2019, Intel Corporation |
| * |
| * 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 Intel Corporation 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 "pt_block_cache.h" |
| |
| #include <stdlib.h> |
| #include <string.h> |
| |
| |
| struct pt_block_cache *pt_bcache_alloc(uint64_t nentries) |
| { |
| struct pt_block_cache *bcache; |
| uint64_t size; |
| |
| if (!nentries || (UINT32_MAX < nentries)) |
| return NULL; |
| |
| size = sizeof(*bcache) + (nentries * sizeof(struct pt_bcache_entry)); |
| if (SIZE_MAX < size) |
| return NULL; |
| |
| bcache = malloc((size_t) size); |
| if (!bcache) |
| return NULL; |
| |
| memset(bcache, 0, (size_t) size); |
| bcache->nentries = (uint32_t) nentries; |
| |
| return bcache; |
| } |
| |
| void pt_bcache_free(struct pt_block_cache *bcache) |
| { |
| free(bcache); |
| } |
| |
| int pt_bcache_add(struct pt_block_cache *bcache, uint64_t index, |
| struct pt_bcache_entry bce) |
| { |
| if (!bcache) |
| return -pte_internal; |
| |
| if (bcache->nentries <= index) |
| return -pte_internal; |
| |
| /* We rely on guaranteed atomic operations as specified in section 8.1.1 |
| * in Volume 3A of the Intel(R) Software Developer's Manual at |
| * http://www.intel.com/sdm. |
| */ |
| bcache->entry[(uint32_t) index] = bce; |
| |
| return 0; |
| } |
| |
| int pt_bcache_lookup(struct pt_bcache_entry *bce, |
| const struct pt_block_cache *bcache, uint64_t index) |
| { |
| if (!bce || !bcache) |
| return -pte_internal; |
| |
| if (bcache->nentries <= index) |
| return -pte_internal; |
| |
| /* We rely on guaranteed atomic operations as specified in section 8.1.1 |
| * in Volume 3A of the Intel(R) Software Developer's Manual at |
| * http://www.intel.com/sdm. |
| */ |
| *bce = bcache->entry[(uint32_t) index]; |
| |
| return 0; |
| } |