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
136
137
138
139
140
141
142
143
144
|
/*
* allocate Blocks from uncached memory
*/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "error.h"
enum
{
Hdrspc = 64, /* leave room for high-level headers */
Bdead = 0x51494F42, /* "QIOB" */
};
struct
{
Lock;
ulong bytes;
} ucialloc;
static Block*
_ucallocb(int size)
{
Block *b;
ulong addr;
if((b = ucalloc(sizeof(Block)+size+Hdrspc)) == nil)
return nil;
b->next = nil;
b->list = nil;
b->free = 0;
b->flag = 0;
/* align start of data portion by rounding up */
addr = (ulong)b;
addr = ROUND(addr + sizeof(Block), BLOCKALIGN);
b->base = (uchar*)addr;
/* align end of data portion by rounding down */
b->lim = ((uchar*)b) + msize(b);
addr = (ulong)(b->lim);
addr = addr & ~(BLOCKALIGN-1);
b->lim = (uchar*)addr;
/* leave sluff at beginning for added headers */
b->rp = b->lim - ROUND(size, BLOCKALIGN);
if(b->rp < b->base)
panic("_ucallocb");
b->wp = b->rp;
return b;
}
Block*
ucallocb(int size)
{
Block *b;
/*
* Check in a process and wait until successful.
* Can still error out of here, though.
*/
if(up == nil)
panic("ucallocb without up: %#p", getcallerpc(&size));
if((b = _ucallocb(size)) == nil)
panic("ucallocb: no memory for %d bytes", size);
setmalloctag(b, getcallerpc(&size));
return b;
}
Block*
uciallocb(int size)
{
Block *b;
static int m1, m2, mp;
if(0 && ucialloc.bytes > conf.ialloc){
if((m1++%10000)==0){
if(mp++ > 1000){
active.exiting = 1;
exit(0);
}
iprint("uciallocb: limited %lud/%lud\n",
ucialloc.bytes, conf.ialloc);
}
return nil;
}
if((b = _ucallocb(size)) == nil){
if(0 && (m2++%10000)==0){
if(mp++ > 1000){
active.exiting = 1;
exit(0);
}
iprint("uciallocb: no memory %lud/%lud\n",
ucialloc.bytes, conf.ialloc);
}
return nil;
}
setmalloctag(b, getcallerpc(&size));
b->flag = BINTR;
ilock(&ucialloc);
ucialloc.bytes += b->lim - b->base;
iunlock(&ucialloc);
return b;
}
void
ucfreeb(Block *b)
{
void *dead = (void*)Bdead;
if(b == nil)
return;
/*
* drivers which perform non cache coherent DMA manage their own buffer
* pool of uncached buffers and provide their own free routine.
*/
if(b->free) {
b->free(b);
return;
}
if(b->flag & BINTR) {
ilock(&ucialloc);
ucialloc.bytes -= b->lim - b->base;
iunlock(&ucialloc);
}
/* poison the block in case someone is still holding onto it */
b->next = dead;
b->rp = dead;
b->wp = dead;
b->lim = dead;
b->base = dead;
ucfree(b);
}
|
