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102 lines
3.2 KiB
C
102 lines
3.2 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2020, Scott Phillips <scottph@freebsd.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _SYS_DUMPSET_H_
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#define _SYS_DUMPSET_H_
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#include <sys/_bitset.h>
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#include <sys/bitset.h>
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extern struct bitset *vm_page_dump;
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extern long vm_page_dump_pages;
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extern vm_paddr_t dump_avail[PHYS_AVAIL_COUNT];
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/* For the common case: add/remove a page from the minidump bitset. */
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#define dump_add_page(pa) vm_page_dump_add(vm_page_dump, pa)
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#define dump_drop_page(pa) vm_page_dump_drop(vm_page_dump, pa)
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static inline void
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vm_page_dump_add(struct bitset *bitset, vm_paddr_t pa)
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{
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vm_pindex_t adj;
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int i;
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adj = 0;
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for (i = 0; dump_avail[i + 1] != 0; i += 2) {
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if (pa >= dump_avail[i] && pa < dump_avail[i + 1]) {
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BIT_SET_ATOMIC(vm_page_dump_pages,
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(pa >> PAGE_SHIFT) - (dump_avail[i] >> PAGE_SHIFT) +
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adj, bitset);
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return;
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}
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adj += howmany(dump_avail[i + 1], PAGE_SIZE) -
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dump_avail[i] / PAGE_SIZE;
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}
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}
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static inline void
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vm_page_dump_drop(struct bitset *bitset, vm_paddr_t pa)
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{
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vm_pindex_t adj;
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int i;
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adj = 0;
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for (i = 0; dump_avail[i + 1] != 0; i += 2) {
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if (pa >= dump_avail[i] && pa < dump_avail[i + 1]) {
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BIT_CLR_ATOMIC(vm_page_dump_pages,
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(pa >> PAGE_SHIFT) - (dump_avail[i] >> PAGE_SHIFT) +
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adj, bitset);
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return;
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}
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adj += howmany(dump_avail[i + 1], PAGE_SIZE) -
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dump_avail[i] / PAGE_SIZE;
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}
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}
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static inline vm_paddr_t
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vm_page_dump_index_to_pa(int bit)
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{
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int i, tot;
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for (i = 0; dump_avail[i + 1] != 0; i += 2) {
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tot = howmany(dump_avail[i + 1], PAGE_SIZE) -
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dump_avail[i] / PAGE_SIZE;
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if (bit < tot)
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return ((vm_paddr_t)bit * PAGE_SIZE +
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(dump_avail[i] & ~PAGE_MASK));
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bit -= tot;
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}
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return (0);
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}
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#define VM_PAGE_DUMP_FOREACH(bitset, pa) \
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for (vm_pindex_t __b = BIT_FFS(vm_page_dump_pages, bitset); \
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(pa) = vm_page_dump_index_to_pa(__b - 1), __b != 0; \
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__b = BIT_FFS_AT(vm_page_dump_pages, bitset, __b))
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#endif /* _SYS_DUMPSET_H_ */
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