1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
#ifndef QEMU_RANGE_H
#define QEMU_RANGE_H
#include <inttypes.h>
#include <qemu/typedefs.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);
}
/* 0,1 can merge with 1,2 but don't overlap */
static inline bool ranges_can_merge(Range *range1, Range *range2)
{
return !(range1->end < range2->begin || range2->end < range1->begin);
}
static inline int range_merge(Range *range1, Range *range2)
{
if (ranges_can_merge(range1, range2)) {
if (range1->end < range2->end) {
range1->end = range2->end;
}
if (range1->begin > range2->begin) {
range1->begin = range2->begin;
}
return 0;
}
return -1;
}
static inline GList *g_list_insert_sorted_merged(GList *list,
gpointer data,
GCompareFunc func)
{
GList *l, *next = NULL;
Range *r, *nextr;
if (!list) {
list = g_list_insert_sorted(list, data, func);
return list;
}
nextr = data;
l = list;
while (l && l != next && nextr) {
r = l->data;
if (ranges_can_merge(r, nextr)) {
range_merge(r, nextr);
l = g_list_remove_link(l, next);
next = g_list_next(l);
if (next) {
nextr = next->data;
} else {
nextr = NULL;
}
} else {
l = g_list_next(l);
}
}
if (!l) {
list = g_list_insert_sorted(list, data, func);
}
return list;
}
static inline gint range_compare(gconstpointer a, gconstpointer b)
{
Range *ra = (Range *)a, *rb = (Range *)b;
if (ra->begin == rb->begin && ra->end == rb->end) {
return 0;
} else if (range_get_last(ra->begin, ra->end) <
range_get_last(rb->begin, rb->end)) {
return -1;
} else {
return 1;
}
}
#endif
|
