223 lines
6.0 KiB
C
223 lines
6.0 KiB
C
/*
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* QEMU 64-bit address ranges
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*
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* Copyright (c) 2015-2016 Red Hat, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef QEMU_RANGE_H
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#define QEMU_RANGE_H
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/*
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* Operations on 64 bit address ranges.
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* Notes:
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* - Ranges must not wrap around 0, but can include UINT64_MAX.
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*/
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struct Range {
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/*
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* Do not access members directly, use the functions!
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* A non-empty range has @lob <= @upb.
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* An empty range has @lob == @upb + 1.
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*/
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uint64_t lob; /* inclusive lower bound */
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uint64_t upb; /* inclusive upper bound */
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};
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static inline void range_invariant(const Range *range)
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{
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assert(range->lob <= range->upb || range->lob == range->upb + 1);
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}
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/* Compound literal encoding the empty range */
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#define range_empty ((Range){ .lob = 1, .upb = 0 })
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/* Is @range empty? */
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static inline bool range_is_empty(const Range *range)
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{
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range_invariant(range);
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return range->lob > range->upb;
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}
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/* Does @range contain @val? */
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static inline bool range_contains(const Range *range, uint64_t val)
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{
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return val >= range->lob && val <= range->upb;
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}
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/* Initialize @range to the empty range */
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static inline void range_make_empty(Range *range)
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{
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*range = range_empty;
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assert(range_is_empty(range));
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}
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/*
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* Initialize @range to span the interval [@lob,@upb].
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* Both bounds are inclusive.
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* The interval must not be empty, i.e. @lob must be less than or
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* equal @upb.
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*/
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static inline void range_set_bounds(Range *range, uint64_t lob, uint64_t upb)
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{
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range->lob = lob;
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range->upb = upb;
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assert(!range_is_empty(range));
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}
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/*
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* Initialize @range to span the interval [@lob,@upb_plus1).
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* The lower bound is inclusive, the upper bound is exclusive.
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* Zero @upb_plus1 is special: if @lob is also zero, set @range to the
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* empty range. Else, set @range to [@lob,UINT64_MAX].
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*/
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static inline void range_set_bounds1(Range *range,
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uint64_t lob, uint64_t upb_plus1)
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{
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if (!lob && !upb_plus1) {
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*range = range_empty;
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} else {
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range->lob = lob;
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range->upb = upb_plus1 - 1;
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}
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range_invariant(range);
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}
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/* Return @range's lower bound. @range must not be empty. */
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static inline uint64_t range_lob(Range *range)
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{
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assert(!range_is_empty(range));
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return range->lob;
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}
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/* Return @range's upper bound. @range must not be empty. */
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static inline uint64_t range_upb(Range *range)
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{
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assert(!range_is_empty(range));
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return range->upb;
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}
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/*
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* Initialize @range to span the interval [@lob,@lob + @size - 1].
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* @size may be 0. If the range would overflow, returns -ERANGE, otherwise
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* 0.
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*/
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static inline int QEMU_WARN_UNUSED_RESULT range_init(Range *range, uint64_t lob,
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uint64_t size)
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{
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if (lob + size < lob) {
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return -ERANGE;
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}
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range->lob = lob;
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range->upb = lob + size - 1;
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range_invariant(range);
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return 0;
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}
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/*
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* Initialize @range to span the interval [@lob,@lob + @size - 1].
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* @size may be 0. Range must not overflow.
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*/
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static inline void range_init_nofail(Range *range, uint64_t lob, uint64_t size)
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{
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range->lob = lob;
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range->upb = lob + size - 1;
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range_invariant(range);
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}
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/*
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* Get the size of @range.
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*/
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static inline uint64_t range_size(const Range *range)
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{
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return range->upb - range->lob + 1;
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}
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/*
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* Check if @range1 overlaps with @range2. If one of the ranges is empty,
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* the result is always "false".
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*/
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static inline bool range_overlaps_range(const Range *range1,
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const Range *range2)
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{
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if (range_is_empty(range1) || range_is_empty(range2)) {
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return false;
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}
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return !(range2->upb < range1->lob || range1->upb < range2->lob);
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}
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/*
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* Check if @range1 contains @range2. If one of the ranges is empty,
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* the result is always "false".
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*/
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static inline bool range_contains_range(const Range *range1,
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const Range *range2)
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{
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if (range_is_empty(range1) || range_is_empty(range2)) {
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return false;
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}
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return range1->lob <= range2->lob && range1->upb >= range2->upb;
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}
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/*
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* Extend @range to the smallest interval that includes @extend_by, too.
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*/
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static inline void range_extend(Range *range, Range *extend_by)
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{
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if (range_is_empty(extend_by)) {
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return;
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}
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if (range_is_empty(range)) {
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*range = *extend_by;
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return;
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}
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if (range->lob > extend_by->lob) {
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range->lob = extend_by->lob;
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}
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if (range->upb < extend_by->upb) {
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range->upb = extend_by->upb;
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}
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range_invariant(range);
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}
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/* Get last byte of a range from offset + length.
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* Undefined for ranges that wrap around 0. */
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static inline uint64_t range_get_last(uint64_t offset, uint64_t len)
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{
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return offset + len - 1;
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}
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/* Check whether a given range covers a given byte. */
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static inline int range_covers_byte(uint64_t offset, uint64_t len,
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uint64_t byte)
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{
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return offset <= byte && byte <= range_get_last(offset, len);
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}
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/* Check whether 2 given ranges overlap.
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* Undefined if ranges that wrap around 0. */
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static inline int ranges_overlap(uint64_t first1, uint64_t len1,
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uint64_t first2, uint64_t len2)
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{
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uint64_t last1 = range_get_last(first1, len1);
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uint64_t last2 = range_get_last(first2, len2);
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return !(last2 < first1 || last1 < first2);
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}
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GList *range_list_insert(GList *list, Range *data);
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#endif
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