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
|
/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2016 Joyent, Inc.
*/
#include <sys/types.h>
#include <sys/thread.h>
#include <sys/proc.h>
#include <sys/mman.h>
#include <sys/vmsystm.h>
#include <vm/as.h>
#include <vm/seg_umap.h>
#if !defined(__xpv)
#include <sys/comm_page.h>
#endif /* !defined(__xpv) */
/*
* Map in the comm page.
*
* The contents of the comm page are only defined on non-xpv x86 at this time.
* Furthermore, the data is only valid in userspace (32-bit or 64-bit) when
* mapped from a 64-bit kernel.
* See: "uts/i86pc/sys/comm_page.h"
*/
caddr_t
comm_page_mapin()
{
#if !defined(__xpv)
proc_t *p = curproc;
caddr_t addr = NULL;
size_t len = COMM_PAGE_SIZE;
uint_t prot = PROT_USER | PROT_READ;
segumap_crargs_t suarg;
map_addr(&addr, len, (offset_t)0, 1, 0);
if (addr == NULL || valid_usr_range(addr, len, prot, p->p_as,
p->p_as->a_userlimit) != RANGE_OKAY) {
return (NULL);
}
suarg.kaddr = (caddr_t)&comm_page;
suarg.prot = suarg.maxprot = prot;
if (as_map(p->p_as, addr, len, segumap_create, &suarg) != 0) {
return (NULL);
}
return (addr);
#else /* !defined(__xpv) */
return (NULL);
#endif /* !defined(__xpv) */
}
|
