| /* |
| * Copyright (c) 2019 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. 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. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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. |
| */ |
| |
| #ifndef PAS_SEGREGATED_PAGE_GRANULE_USE_COUNT_H |
| #define PAS_SEGREGATED_PAGE_GRANULE_USE_COUNT_H |
| |
| #include "pas_utils.h" |
| |
| PAS_BEGIN_EXTERN_C; |
| |
| typedef uint8_t pas_segregated_page_granule_use_count; |
| #define PAS_SEGREGATED_PAGE_GRANULE_DECOMMITTED 255u /* Has to be the max value. */ |
| |
| static PAS_ALWAYS_INLINE void pas_segregated_page_granule_use_count_increment( |
| pas_segregated_page_granule_use_count* use_count_ptr, |
| void* arg) |
| { |
| pas_segregated_page_granule_use_count use_count; |
| |
| use_count = *use_count_ptr; |
| |
| PAS_ASSERT(use_count != PAS_SEGREGATED_PAGE_GRANULE_DECOMMITTED); |
| |
| use_count++; |
| |
| PAS_ASSERT(use_count != PAS_SEGREGATED_PAGE_GRANULE_DECOMMITTED); |
| |
| *use_count_ptr = use_count; |
| } |
| |
| static PAS_ALWAYS_INLINE void pas_segregated_page_granule_for_each_use_in_range( |
| pas_segregated_page_granule_use_count* use_counts, |
| uintptr_t begin, |
| uintptr_t end, |
| uintptr_t page_size, |
| uintptr_t granule_size, |
| void (*action)(pas_segregated_page_granule_use_count* use_count, void* arg), |
| void* arg) |
| { |
| uintptr_t index_of_first_granule; |
| uintptr_t index_of_last_granule; |
| uintptr_t granule_index; |
| |
| if (begin == end) |
| return; |
| |
| index_of_first_granule = begin / granule_size; |
| index_of_last_granule = (end - 1) / granule_size; |
| |
| PAS_ASSERT(index_of_last_granule < page_size / granule_size); |
| |
| for (granule_index = index_of_first_granule; |
| granule_index <= index_of_last_granule; |
| ++granule_index) |
| action(use_counts + granule_index, arg); |
| } |
| |
| static PAS_ALWAYS_INLINE void pas_segregated_page_granule_increment_uses_for_range( |
| pas_segregated_page_granule_use_count* use_counts, |
| uintptr_t begin, |
| uintptr_t end, |
| uintptr_t page_size, |
| uintptr_t granule_size) |
| { |
| pas_segregated_page_granule_for_each_use_in_range( |
| use_counts, begin, end, page_size, granule_size, |
| pas_segregated_page_granule_use_count_increment, NULL); |
| } |
| |
| PAS_END_EXTERN_C; |
| |
| #endif /* PAS_SEGREGATED_PAGE_GRANULE_USE_COUNT_H */ |
| |