112 lines
3.2 KiB
C
112 lines
3.2 KiB
C
/*-
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* Copyright (c) 2015 Neel Natu <neel@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/param.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <machine/vmm.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdbool.h>
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#include <vmmapi.h>
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#include "bhyverun.h"
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#include "bootrom.h"
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#define MAX_BOOTROM_SIZE (16 * 1024 * 1024) /* 16 MB */
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int
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bootrom_init(struct vmctx *ctx, const char *romfile)
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{
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struct stat sbuf;
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vm_paddr_t gpa;
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ssize_t rlen;
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char *ptr;
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int fd, i, rv, prot;
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rv = -1;
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fd = open(romfile, O_RDONLY);
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if (fd < 0) {
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fprintf(stderr, "Error opening bootrom \"%s\": %s\n",
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romfile, strerror(errno));
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goto done;
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}
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if (fstat(fd, &sbuf) < 0) {
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fprintf(stderr, "Could not fstat bootrom file \"%s\": %s\n",
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romfile, strerror(errno));
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goto done;
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}
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/*
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* Limit bootrom size to 16MB so it doesn't encroach into reserved
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* MMIO space (e.g. APIC, HPET, MSI).
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*/
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if (sbuf.st_size > MAX_BOOTROM_SIZE || sbuf.st_size < PAGE_SIZE) {
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fprintf(stderr, "Invalid bootrom size %ld\n", sbuf.st_size);
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goto done;
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}
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if (sbuf.st_size & PAGE_MASK) {
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fprintf(stderr, "Bootrom size %ld is not a multiple of the "
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"page size\n", sbuf.st_size);
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goto done;
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}
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ptr = vm_create_devmem(ctx, VM_BOOTROM, "bootrom", sbuf.st_size);
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if (ptr == MAP_FAILED)
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goto done;
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/* Map the bootrom into the guest address space */
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prot = PROT_READ | PROT_EXEC;
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gpa = (1ULL << 32) - sbuf.st_size;
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if (vm_mmap_memseg(ctx, gpa, VM_BOOTROM, 0, sbuf.st_size, prot) != 0)
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goto done;
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/* Read 'romfile' into the guest address space */
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for (i = 0; i < sbuf.st_size / PAGE_SIZE; i++) {
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rlen = read(fd, ptr + i * PAGE_SIZE, PAGE_SIZE);
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if (rlen != PAGE_SIZE) {
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fprintf(stderr, "Incomplete read of page %d of bootrom "
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"file %s: %ld bytes\n", i, romfile, rlen);
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goto done;
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}
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}
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rv = 0;
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done:
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if (fd >= 0)
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close(fd);
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return (rv);
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}
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