1 /*-
2 * Copyright (c) 2015 Neel Natu <neel@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/param.h>
28 __FBSDID("$FreeBSD$");
29
30 #include <sys/types.h>
31 #include <sys/mman.h>
32 #include <sys/stat.h>
33
34 #include <machine/vmm.h>
35
36 #include <errno.h>
37 #include <fcntl.h>
38 #include <stdio.h>
39 #include <string.h>
40 #include <unistd.h>
41 #include <stdbool.h>
42
43 #include <vmmapi.h>
44 #include "bhyverun.h"
45 #include "bootrom.h"
46
47 #define MAX_BOOTROM_SIZE (16 * 1024 * 1024) /* 16 MB */
48
49 int
bootrom_init(struct vmctx * ctx,const char * romfile)50 bootrom_init(struct vmctx *ctx, const char *romfile)
51 {
52 struct stat sbuf;
53 vm_paddr_t gpa;
54 ssize_t rlen;
55 char *ptr;
56 int fd, i, rv, prot;
57
58 rv = -1;
59 fd = open(romfile, O_RDONLY);
60 if (fd < 0) {
61 fprintf(stderr, "Error opening bootrom \"%s\": %s\n",
62 romfile, strerror(errno));
63 goto done;
64 }
65
66 if (fstat(fd, &sbuf) < 0) {
67 fprintf(stderr, "Could not fstat bootrom file \"%s\": %s\n",
68 romfile, strerror(errno));
69 goto done;
70 }
71
72 /*
73 * Limit bootrom size to 16MB so it doesn't encroach into reserved
74 * MMIO space (e.g. APIC, HPET, MSI).
75 */
76 if (sbuf.st_size > MAX_BOOTROM_SIZE || sbuf.st_size < PAGE_SIZE) {
77 fprintf(stderr, "Invalid bootrom size %ld\n", sbuf.st_size);
78 goto done;
79 }
80
81 if (sbuf.st_size & PAGE_MASK) {
82 fprintf(stderr, "Bootrom size %ld is not a multiple of the "
83 "page size\n", sbuf.st_size);
84 goto done;
85 }
86
87 ptr = vm_create_devmem(ctx, VM_BOOTROM, "bootrom", sbuf.st_size);
88 if (ptr == MAP_FAILED)
89 goto done;
90
91 /* Map the bootrom into the guest address space */
92 prot = PROT_READ | PROT_EXEC;
93 gpa = (1ULL << 32) - sbuf.st_size;
94 if (vm_mmap_memseg(ctx, gpa, VM_BOOTROM, 0, sbuf.st_size, prot) != 0)
95 goto done;
96
97 /* Read 'romfile' into the guest address space */
98 for (i = 0; i < sbuf.st_size / PAGE_SIZE; i++) {
99 rlen = read(fd, ptr + i * PAGE_SIZE, PAGE_SIZE);
100 if (rlen != PAGE_SIZE) {
101 fprintf(stderr, "Incomplete read of page %d of bootrom "
102 "file %s: %ld bytes\n", i, romfile, rlen);
103 goto done;
104 }
105 }
106 rv = 0;
107 done:
108 if (fd >= 0)
109 close(fd);
110 return (rv);
111 }
112