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/*-
* 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 <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"
#define MAX_BOOTROM_SIZE (16 * 1024 * 1024) /* 16 MB */
int
bootrom_init(struct vmctx *ctx, const char *romfile)
{
struct stat sbuf;
vm_paddr_t gpa;
ssize_t rlen;
char *ptr;
int fd, i, rv, prot;
rv = -1;
fd = open(romfile, O_RDONLY);
if (fd < 0) {
fprintf(stderr, "Error opening bootrom \"%s\": %s\n",
romfile, strerror(errno));
goto done;
}
if (fstat(fd, &sbuf) < 0) {
fprintf(stderr, "Could not fstat bootrom file \"%s\": %s\n",
romfile, strerror(errno));
goto done;
}
/*
* Limit bootrom size to 16MB so it doesn't encroach into reserved
* MMIO space (e.g. APIC, HPET, MSI).
*/
if (sbuf.st_size > MAX_BOOTROM_SIZE || sbuf.st_size < PAGE_SIZE) {
fprintf(stderr, "Invalid bootrom size %ld\n", sbuf.st_size);
goto done;
}
if (sbuf.st_size & PAGE_MASK) {
fprintf(stderr, "Bootrom size %ld is not a multiple of the "
"page size\n", sbuf.st_size);
goto done;
}
ptr = vm_create_devmem(ctx, VM_BOOTROM, "bootrom", sbuf.st_size);
if (ptr == MAP_FAILED)
goto done;
/* Map the bootrom into the guest address space */
prot = PROT_READ | PROT_EXEC;
gpa = (1ULL << 32) - sbuf.st_size;
if (vm_mmap_memseg(ctx, gpa, VM_BOOTROM, 0, sbuf.st_size, prot) != 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) {
fprintf(stderr, "Incomplete read of page %d of bootrom "
"file %s: %ld bytes\n", i, romfile, rlen);
goto done;
}
}
rv = 0;
done:
if (fd >= 0)
close(fd);
return (rv);
}
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