diff options
Diffstat (limited to 'usr.sbin/bhyve/bootrom.c')
-rw-r--r-- | usr.sbin/bhyve/bootrom.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/usr.sbin/bhyve/bootrom.c b/usr.sbin/bhyve/bootrom.c new file mode 100644 index 0000000..5e4e0e9 --- /dev/null +++ b/usr.sbin/bhyve/bootrom.c @@ -0,0 +1,111 @@ +/*- + * 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); +} |