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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2015 Neel Natu <neel@freebsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/param.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <machine/vmm.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdbool.h>
#include <vmmapi.h>
#include "bhyverun.h"
#include "bootrom.h"
#include "debug.h"
#define BOOTROM_SIZE (16 * 1024 * 1024) /* 16 MB */
/*
* ROM region is 16 MB at the top of 4GB ("low") memory.
*
* The size is limited so it doesn't encroach into reserved MMIO space (e.g.,
* APIC, HPET, MSI).
*
* It is allocated in page-multiple blocks on a first-come first-serve basis,
* from high to low, during initialization, and does not change at runtime.
*/
static char *romptr; /* Pointer to userspace-mapped bootrom region. */
static vm_paddr_t gpa_base; /* GPA of low end of region. */
static vm_paddr_t gpa_allocbot; /* Low GPA of free region. */
static vm_paddr_t gpa_alloctop; /* High GPA, minus 1, of free region. */
void
init_bootrom(struct vmctx *ctx)
{
romptr = vm_create_devmem(ctx, VM_BOOTROM, "bootrom", BOOTROM_SIZE);
if (romptr == MAP_FAILED)
err(4, "%s: vm_create_devmem", __func__);
gpa_base = (1ULL << 32) - BOOTROM_SIZE;
gpa_allocbot = gpa_base;
gpa_alloctop = (1ULL << 32) - 1;
}
int
bootrom_alloc(struct vmctx *ctx, size_t len, int prot, int flags,
char **region_out, uint64_t *gpa_out)
{
static const int bootrom_valid_flags = BOOTROM_ALLOC_TOP;
vm_paddr_t gpa;
vm_ooffset_t segoff;
if (flags & ~bootrom_valid_flags) {
warnx("%s: Invalid flags: %x", __func__,
flags & ~bootrom_valid_flags);
return (EINVAL);
}
if (prot & ~_PROT_ALL) {
warnx("%s: Invalid protection: %x", __func__,
prot & ~_PROT_ALL);
return (EINVAL);
}
if (len == 0 || len > BOOTROM_SIZE) {
warnx("ROM size %zu is invalid", len);
return (EINVAL);
}
if (len & PAGE_MASK) {
warnx("ROM size %zu is not a multiple of the page size",
len);
return (EINVAL);
}
if (flags & BOOTROM_ALLOC_TOP) {
gpa = (gpa_alloctop - len) + 1;
if (gpa < gpa_allocbot) {
warnx("No room for %zu ROM in bootrom region", len);
return (ENOMEM);
}
} else {
gpa = gpa_allocbot;
if (gpa > (gpa_alloctop - len) + 1) {
warnx("No room for %zu ROM in bootrom region", len);
return (ENOMEM);
}
}
segoff = gpa - gpa_base;
if (vm_mmap_memseg(ctx, gpa, VM_BOOTROM, segoff, len, prot) != 0) {
int serrno = errno;
warn("%s: vm_mmap_mapseg", __func__);
return (serrno);
}
if (flags & BOOTROM_ALLOC_TOP)
gpa_alloctop = gpa - 1;
else
gpa_allocbot = gpa + len;
*region_out = romptr + segoff;
if (gpa_out != NULL)
*gpa_out = gpa;
return (0);
}
int
bootrom_loadrom(struct vmctx *ctx, const char *romfile)
{
struct stat sbuf;
ssize_t rlen;
char *ptr;
int fd, i, rv;
rv = -1;
fd = open(romfile, O_RDONLY);
if (fd < 0) {
EPRINTLN("Error opening bootrom \"%s\": %s",
romfile, strerror(errno));
goto done;
}
if (fstat(fd, &sbuf) < 0) {
EPRINTLN("Could not fstat bootrom file \"%s\": %s",
romfile, strerror(errno));
goto done;
}
/* Map the bootrom into the guest address space */
if (bootrom_alloc(ctx, sbuf.st_size, PROT_READ | PROT_EXEC,
BOOTROM_ALLOC_TOP, &ptr, NULL) != 0)
goto done;
/* Read 'romfile' into the guest address space */
for (i = 0; i < sbuf.st_size / PAGE_SIZE; i++) {
rlen = read(fd, ptr + i * PAGE_SIZE, PAGE_SIZE);
if (rlen != PAGE_SIZE) {
EPRINTLN("Incomplete read of page %d of bootrom "
"file %s: %ld bytes", i, romfile, rlen);
goto done;
}
}
rv = 0;
done:
if (fd >= 0)
close(fd);
return (rv);
}
|
