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: releng/11.0/usr.sbin/bhyve/bootrom.c 284539 2015-06-18 06:00:17Z neel $");
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
49int
50bootrom_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;
107done:
108	if (fd >= 0)
109		close(fd);
110	return (rv);
111}
112