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/*
* QEMU 64-bit address ranges
*
* Copyright (c) 2015-2016 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef QEMU_RANGE_H
#define QEMU_RANGE_H
#include "qemu/queue.h"
/*
* Operations on 64 bit address ranges.
* Notes:
* - ranges must not wrap around 0, but can include the last byte ~0x0LL.
* - this can not represent a full 0 to ~0x0LL range.
*/
/* A structure representing a range of addresses. */
struct Range {
uint64_t begin; /* First byte of the range, or 0 if empty. */
uint64_t end; /* 1 + the last byte. 0 if range empty or ends at ~0x0LL. */
};
static inline void range_extend(Range *range, Range *extend_by)
{
if (!extend_by->begin && !extend_by->end) {
return;
}
if (!range->begin && !range->end) {
*range = *extend_by;
return;
}
if (range->begin > extend_by->begin) {
range->begin = extend_by->begin;
}
/* Compare last byte in case region ends at ~0x0LL */
if (range->end - 1 < extend_by->end - 1) {
range->end = extend_by->end;
}
}
/* Get last byte of a range from offset + length.
* Undefined for ranges that wrap around 0. */
static inline uint64_t range_get_last(uint64_t offset, uint64_t len)
{
return offset + len - 1;
}
/* Check whether a given range covers a given byte. */
static inline int range_covers_byte(uint64_t offset, uint64_t len,
uint64_t byte)
{
return offset <= byte && byte <= range_get_last(offset, len);
}
/* Check whether 2 given ranges overlap.
* Undefined if ranges that wrap around 0. */
static inline int ranges_overlap(uint64_t first1, uint64_t len1,
uint64_t first2, uint64_t len2)
{
uint64_t last1 = range_get_last(first1, len1);
uint64_t last2 = range_get_last(first2, len2);
return !(last2 < first1 || last1 < first2);
}
GList *range_list_insert(GList *list, Range *data);
#endif
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