freebsd-dev/sys/boot/efi/libefi/efipart.c
Rebecca Cran ce52330412 Handle memory allocation failures in include().
PR:		i386/85652
Submitted by:	Ben Thomas <bthomas at virtualiron.com>
MFC after:	3 days
2011-02-23 17:17:05 +00:00

267 lines
6.4 KiB
C

/*-
* Copyright (c) 2010 Marcel Moolenaar
* 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 AND CONTRIBUTORS ``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/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/time.h>
#include <stddef.h>
#include <stdarg.h>
#include <bootstrap.h>
#include <efi.h>
#include <efilib.h>
#include <efiprot.h>
static EFI_GUID blkio_guid = BLOCK_IO_PROTOCOL;
static int efipart_init(void);
static int efipart_strategy(void *, int, daddr_t, size_t, char *, size_t *);
static int efipart_open(struct open_file *, ...);
static int efipart_close(struct open_file *);
static void efipart_print(int);
struct devsw efipart_dev = {
.dv_name = "part",
.dv_type = DEVT_DISK,
.dv_init = efipart_init,
.dv_strategy = efipart_strategy,
.dv_open = efipart_open,
.dv_close = efipart_close,
.dv_ioctl = noioctl,
.dv_print = efipart_print,
.dv_cleanup = NULL
};
static int
efipart_init(void)
{
EFI_BLOCK_IO *blkio;
EFI_HANDLE *hin, *hout;
EFI_STATUS status;
UINTN sz;
u_int n, nin, nout;
int err;
sz = 0;
hin = NULL;
status = BS->LocateHandle(ByProtocol, &blkio_guid, 0, &sz, 0);
if (status == EFI_BUFFER_TOO_SMALL) {
hin = (EFI_HANDLE *)malloc(sz * 2);
status = BS->LocateHandle(ByProtocol, &blkio_guid, 0, &sz,
hin);
if (EFI_ERROR(status))
free(hin);
}
if (EFI_ERROR(status))
return (efi_status_to_errno(status));
/* Filter handles to only include FreeBSD partitions. */
nin = sz / sizeof(EFI_HANDLE);
hout = hin + nin;
nout = 0;
for (n = 0; n < nin; n++) {
status = BS->HandleProtocol(hin[n], &blkio_guid, &blkio);
if (EFI_ERROR(status))
continue;
if (!blkio->Media->LogicalPartition)
continue;
hout[nout] = hin[n];
nout++;
}
err = efi_register_handles(&efipart_dev, hout, nout);
free(hin);
return (err);
}
static void
efipart_print(int verbose)
{
char line[80];
EFI_BLOCK_IO *blkio;
EFI_HANDLE h;
EFI_STATUS status;
u_int unit;
for (unit = 0, h = efi_find_handle(&efipart_dev, 0);
h != NULL; h = efi_find_handle(&efipart_dev, ++unit)) {
sprintf(line, " %s%d:", efipart_dev.dv_name, unit);
pager_output(line);
status = BS->HandleProtocol(h, &blkio_guid, &blkio);
if (!EFI_ERROR(status)) {
sprintf(line, " %llu blocks",
(unsigned long long)(blkio->Media->LastBlock + 1));
pager_output(line);
if (blkio->Media->RemovableMedia)
pager_output(" (removable)");
}
pager_output("\n");
}
}
static int
efipart_open(struct open_file *f, ...)
{
va_list args;
struct devdesc *dev;
EFI_BLOCK_IO *blkio;
EFI_HANDLE h;
EFI_STATUS status;
va_start(args, f);
dev = va_arg(args, struct devdesc*);
va_end(args);
h = efi_find_handle(&efipart_dev, dev->d_unit);
if (h == NULL)
return (EINVAL);
status = BS->HandleProtocol(h, &blkio_guid, &blkio);
if (EFI_ERROR(status))
return (efi_status_to_errno(status));
if (!blkio->Media->MediaPresent)
return (EAGAIN);
dev->d_opendata = blkio;
return (0);
}
static int
efipart_close(struct open_file *f)
{
struct devdesc *dev;
dev = (struct devdesc *)(f->f_devdata);
if (dev->d_opendata == NULL)
return (EINVAL);
dev->d_opendata = NULL;
return (0);
}
/*
* efipart_readwrite()
* Internal equivalent of efipart_strategy(), which operates on the
* media-native block size. This function expects all I/O requests
* to be within the media size and returns an error if such is not
* the case.
*/
static int
efipart_readwrite(EFI_BLOCK_IO *blkio, int rw, daddr_t blk, daddr_t nblks,
char *buf)
{
EFI_STATUS status;
if (blkio == NULL)
return (ENXIO);
if (blk < 0 || blk > blkio->Media->LastBlock)
return (EIO);
if ((blk + nblks - 1) > blkio->Media->LastBlock)
return (EIO);
switch (rw) {
case F_READ:
status = blkio->ReadBlocks(blkio, blkio->Media->MediaId, blk,
nblks * blkio->Media->BlockSize, buf);
break;
case F_WRITE:
if (blkio->Media->ReadOnly)
return (EROFS);
status = blkio->WriteBlocks(blkio, blkio->Media->MediaId, blk,
nblks * blkio->Media->BlockSize, buf);
break;
default:
return (ENOSYS);
}
if (EFI_ERROR(status))
printf("%s: rw=%d, status=%u\n", __func__, rw, status);
return (efi_status_to_errno(status));
}
static int
efipart_strategy(void *devdata, int rw, daddr_t blk, size_t size, char *buf,
size_t *rsize)
{
struct devdesc *dev = (struct devdesc *)devdata;
EFI_BLOCK_IO *blkio;
off_t off;
char *blkbuf;
size_t blkoff, blksz;
int error;
if (dev == NULL || blk < 0)
return (EINVAL);
blkio = dev->d_opendata;
if (blkio == NULL)
return (ENXIO);
if (size == 0 || (size % 512) != 0)
return (EIO);
if (rsize != NULL)
*rsize = size;
if (blkio->Media->BlockSize == 512)
return (efipart_readwrite(blkio, rw, blk, size / 512, buf));
/*
* The block size of the media is not 512B per sector.
*/
blkbuf = malloc(blkio->Media->BlockSize);
if (blkbuf == NULL)
return (ENOMEM);
error = 0;
off = blk * 512;
blk = off / blkio->Media->BlockSize;
blkoff = off % blkio->Media->BlockSize;
blksz = blkio->Media->BlockSize - blkoff;
while (size > 0) {
error = efipart_readwrite(blkio, rw, blk, 1, blkbuf);
if (error)
break;
if (size < blksz)
blksz = size;
bcopy(blkbuf + blkoff, buf, blksz);
buf += blksz;
size -= blksz;
blk++;
blkoff = 0;
blksz = blkio->Media->BlockSize;
}
free(blkbuf);
return (error);
}