1 files changed, 314 insertions, 0 deletions

diff --git a/sys/geom/geom_gpt.c b/sys/geom/geom_gpt.c
new file mode 100644
index 000000000000..3f446e34c4b8
--- /dev/null
+++ b/sys/geom/geom_gpt.c
@@ -0,0 +1,314 @@
+/*-
+ * Copyright (c) 2002 Marcel Moolenaar
+ * Copyright (c) 2002 Poul-Henning Kamp
+ * Copyright (c) 2002 Networks Associates Technology, Inc.
+ * 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.
+ * 3. The names of the authors may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+/*
+ * CRC32 code derived from work by Gary S. Brown.
+ */
+
+#include <sys/param.h>
+#ifndef _KERNEL
+#include <stdio.h>
+#include <string.h>
+#include <signal.h>
+#include <sys/param.h>
+#include <stdlib.h>
+#include <err.h>
+#else
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/malloc.h>
+#include <sys/bio.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#endif
+
+#include <sys/endian.h>
+#include <sys/errno.h>
+#include <sys/disklabel.h>
+#include <sys/sbuf.h>
+#include <sys/uuid.h>
+#include <sys/gpt.h>
+#include <geom/geom.h>
+#include <geom/geom_slice.h>
+
+/*
+ * XXX: GEOM is not dynamic enough. We are forced to use a compile-time
+ * limit. The minimum number of partitions (128) as required by EFI is
+ * most of the time just a waste of space.
+ */
+#define	GPT_MAX_SLICES	128
+
+struct g_gpt_softc {
+	struct gpt_ent *part[GPT_MAX_SLICES];
+};
+
+static uint32_t crc32_tab[] = {
+	0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
+	0xe963a535, 0x9e6495a3,	0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
+	0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
+	0xf3b97148, 0x84be41de,	0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
+	0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,	0x14015c4f, 0x63066cd9,
+	0xfa0f3d63, 0x8d080df5,	0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
+	0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,	0x35b5a8fa, 0x42b2986c,
+	0xdbbbc9d6, 0xacbcf940,	0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
+	0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
+	0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
+	0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,	0x76dc4190, 0x01db7106,
+	0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
+	0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
+	0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
+	0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
+	0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
+	0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
+	0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
+	0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
+	0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
+	0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
+	0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
+	0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
+	0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
+	0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
+	0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
+	0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
+	0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
+	0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
+	0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
+	0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
+	0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
+	0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
+	0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
+	0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
+	0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
+	0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
+	0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
+	0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
+	0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
+	0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
+	0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
+	0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
+};
+
+static uint32_t
+crc32(const void *buf, size_t size)
+{
+	const uint8_t *p;
+	uint32_t crc;
+
+	p = buf;
+	crc = ~0U;
+
+	while (size--)
+		crc = crc32_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8);
+
+	return crc ^ ~0U;
+}
+
+static int
+is_gpt_hdr(struct gpt_hdr *hdr)
+{
+	uint32_t crc;
+
+	if (memcmp(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig)))
+		return (0);
+	crc = hdr->hdr_crc_self;
+	hdr->hdr_crc_self = 0;
+	if (crc32(hdr, hdr->hdr_size) != crc)
+		return (0);
+	hdr->hdr_crc_self = crc;
+	/* We're happy... */
+	return (1);
+}
+
+static int
+g_gpt_start(struct bio *bp)
+{
+	struct uuid freebsd = GPT_ENT_TYPE_FREEBSD;
+	struct g_provider *pp = bp->bio_to;
+	struct g_geom *gp = pp->geom;
+	struct g_slicer *gsp = gp->softc;
+	struct g_gpt_softc *gs = gsp->softc;
+	u_int type;
+
+	if (bp->bio_cmd != BIO_GETATTR)
+		return (0);
+
+	/*
+	 * XXX: this is bogus. The BSD class has a strong dependency on
+	 * the MBR/MBREXT class, because it asks for an attribute that's
+	 * specific to the MBR/MBREXT class and the value of the attribute
+	 * is just as specific to the MBR class. In an extensible scheme
+	 * a geom would ask another geom if it could possible accomodate a
+	 * class and the answer should be yes or no. Now we're forced to
+	 * emulate a MBR class :-/
+	 */
+	type = (memcmp(&gs->part[pp->index]->ent_type, &freebsd,
+	    sizeof(freebsd))) ? 0 : 165;
+	return ((g_haveattr_int(bp, "MBR::type", type)) ? 1 : 0);
+}
+
+static void
+g_gpt_dumpconf(struct sbuf *sb, char *indent, struct g_geom *gp,
+    struct g_consumer *cp, struct g_provider *pp)
+{
+	struct g_slicer *gsp = gp->softc;
+	struct g_gpt_softc *gs = gsp->softc;
+	struct uuid *uuid;
+
+	g_slice_dumpconf(sb, indent, gp, cp, pp);
+
+	if (pp != NULL) {
+		uuid = &gs->part[pp->index]->ent_type;
+		sbuf_printf(sb, "%s<type>", indent);
+		sbuf_printf_uuid(sb, uuid);
+		sbuf_printf(sb, "</type>\n");
+	}
+}
+
+static struct g_geom *
+g_gpt_taste(struct g_class *mp, struct g_provider *pp, int insist)
+{
+	struct g_consumer *cp;
+	struct g_geom *gp;
+	struct g_gpt_softc *gs;
+	struct g_slicer *gsp;
+	u_char *buf, *mbr;
+	struct gpt_ent *ent;
+	struct gpt_hdr *hdr;
+	u_int i, npart, secsz, tblsz;
+	int error;
+
+	g_trace(G_T_TOPOLOGY, "g_gpt_taste(%s,%s)", mp->name, pp->name);
+	g_topology_assert();
+
+	/*
+	 * XXX: I don't like to hardcode a maximum number of slices, since
+	 * it's wasting space most of the time and insufficient any time.
+	 * It's easier for now...
+	 */
+	gp = g_slice_new(mp, GPT_MAX_SLICES, pp, &cp, &gs, sizeof(*gs),
+	    g_gpt_start);
+	if (gp == NULL)
+		return (NULL);
+
+	gsp = gp->softc;
+	g_topology_unlock();
+	gp->dumpconf = g_gpt_dumpconf;
+
+	npart = 0;
+	mbr = NULL;
+
+	if (gp->rank != 2 && insist == 0)
+		goto out;
+
+	error = g_getattr("GEOM::sectorsize", cp, &secsz);
+	if (error)
+		goto out;
+
+	/* XXX: we need to get the media size as well. */
+
+	/* Read both the MBR sector and the GPT sector. */
+	mbr = g_read_data(cp, 0, 2 * secsz, &error);
+	if (mbr == NULL || error != 0)
+		goto out;
+#if 0
+	/*
+	 * XXX: we should ignore the GPT if there's a MBR and the MBR is
+	 * not a PMBR (Protective MBR). I believe this is what the EFI
+	 * spec is going to say eventually (this is hearsay :-)
+	 * Currently EFI (version 1.02) accepts and uses the GPT even
+	 * though there's a valid MBR. We do this too, because it allows
+	 * us to test this code without first nuking the only partitioning
+	 * scheme we grok until this is working.
+	 */
+	if (!is_pmbr((void*)mbr))
+		goto out;
+#endif
+
+	hdr = (void*)(mbr + secsz);
+
+	/*
+	 * XXX: if we don't have a GPT header at LBA 1, we should check if
+	 * there's a backup GPT at the end of the medium. If we have a valid
+	 * backup GPT, we should restore the primary GPT and claim this lunch.
+	 */
+	if (!is_gpt_hdr(hdr))
+		goto out;
+
+	tblsz = (hdr->hdr_entries * hdr->hdr_entsz + secsz - 1) & ~(secsz - 1);
+	buf = g_read_data(cp, hdr->hdr_lba_table * secsz, tblsz, &error);
+
+	gsp->frontstuff = hdr->hdr_lba_start * secsz;
+
+	for (i = 0; i < hdr->hdr_entries; i++) {
+		struct uuid unused = GPT_ENT_TYPE_UNUSED;
+		if (i >= GPT_MAX_SLICES)
+			break;
+		ent = (void*)(buf + i * hdr->hdr_entsz);
+		if (!memcmp(&ent->ent_type, &unused, sizeof(unused)))
+			continue;
+		gs->part[i] = g_malloc(hdr->hdr_entsz, M_WAITOK);
+		if (gs->part[i] == NULL)
+			break;
+		bcopy(ent, gs->part[i], hdr->hdr_entsz);
+		(void)g_slice_addslice(gp, i, ent->ent_lba_start * secsz,
+		    (ent->ent_lba_end - ent->ent_lba_start + 1ULL) * secsz,
+		    "%ss%d", gp->name, i + 1);
+		npart++;
+	}
+
+	g_free(buf);
+
+ out:
+	if (mbr != NULL)
+		g_free(mbr);
+
+	g_topology_lock();
+	error = g_access_rel(cp, -1, 0, 0);
+
+	if (npart > 0) {
+		LIST_FOREACH(pp, &gp->provider, provider)
+			g_error_provider(pp, 0);
+		return (gp);
+	}
+	g_std_spoiled(cp);
+	return (NULL);
+}
+
+static struct g_class g_gpt_class = {
+	"GPT",
+	g_gpt_taste,
+	NULL,
+	G_CLASS_INITSTUFF
+};
+
+DECLARE_GEOM_CLASS(g_gpt_class, g_gpt);