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Index: stand/efi/boot1/ufs_module.c
===================================================================
--- stand/efi/boot1/ufs_module.c
+++ stand/efi/boot1/ufs_module.c
@@ -36,12 +36,16 @@
#include <stdbool.h>
#include <sys/cdefs.h>
#include <sys/param.h>
+#include <sys/disk/bsd.h>
#include <efi.h>
#include "boot_module.h"
+#define BSD_LABEL_OFFSET DEV_BSIZE
+
static dev_info_t *devinfo;
static dev_info_t *devices;
+static uint64_t partoff;
static int
dskread(void *buf, uint64_t lba, int nblk)
@@ -49,6 +53,7 @@
int size;
EFI_STATUS status;
+ lba += partoff;
lba = lba / (devinfo->dev->Media->BlockSize / DEV_BSIZE);
size = nblk * DEV_BSIZE;
@@ -73,11 +78,36 @@
static int
init_dev(dev_info_t* dev)
{
+ int ok;
+ struct disklabel *dl;
+ char buffer[DEV_BSIZE];
devinfo = dev;
dmadat = &__dmadat;
- return fsread(0, NULL, 0);
+ /*
+ * First try offset 0. This is the normal GPT case where we have no
+ * further partitioning.
+ */
+ partoff = 0;
+ ok = fsread(0, NULL, 0);
+ if (ok >= 0)
+ return (ok);
+
+ /*
+ * Now try to read a bsdlabel at offset 512. There's others that are
+ * historic, but we don't probe those. UEFI is little endian only, as
+ * are BSD labels. We will retry if there's a label found with a
+ * non-zero offset (otherwise, there'd be no change to the last test).
+ */
+ if (dskread(buffer, BSD_LABEL_OFFSET / DEV_BSIZE, 1) != 0)
+ return (-1);
+ dl = (struct disklabel *)buffer;
+ if (dl->d_magic != BSD_MAGIC || dl->d_magic2 != BSD_MAGIC ||
+ dl->d_partitions[0].p_offset == 0)
+ return (-1);
+ partoff = dl->d_partitions[0].p_offset;
+ return (fsread(0, NULL, 0));
}
static EFI_STATUS

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