2 * Copyright (c) 2002, 2005-2007, 2011 Marcel Moolenaar
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
32 #include <sys/diskmbr.h>
33 #include <sys/endian.h>
35 #include <sys/kernel.h>
37 #include <sys/limits.h>
39 #include <sys/malloc.h>
40 #include <sys/mutex.h>
41 #include <sys/queue.h>
43 #include <sys/systm.h>
44 #include <sys/sysctl.h>
46 #include <geom/geom.h>
47 #include <geom/part/g_part.h>
49 #include "g_part_if.h"
51 FEATURE(geom_part_gpt, "GEOM partitioning class for GPT partitions support");
53 CTASSERT(offsetof(struct gpt_hdr, padding) == 92);
54 CTASSERT(sizeof(struct gpt_ent) == 128);
56 #define EQUUID(a,b) (memcmp(a, b, sizeof(struct uuid)) == 0)
69 GPT_STATE_UNKNOWN, /* Not determined. */
70 GPT_STATE_MISSING, /* No signature found. */
71 GPT_STATE_CORRUPT, /* Checksum mismatch. */
72 GPT_STATE_INVALID, /* Nonconformant/invalid. */
73 GPT_STATE_OK /* Perfectly fine. */
76 struct g_part_gpt_table {
77 struct g_part_table base;
80 quad_t lba[GPT_ELT_COUNT];
81 enum gpt_state state[GPT_ELT_COUNT];
85 struct g_part_gpt_entry {
86 struct g_part_entry base;
90 static void g_gpt_printf_utf16(struct sbuf *, uint16_t *, size_t);
91 static void g_gpt_utf8_to_utf16(const uint8_t *, uint16_t *, size_t);
92 static void g_gpt_set_defaults(struct g_part_table *, struct g_provider *);
94 static int g_part_gpt_add(struct g_part_table *, struct g_part_entry *,
95 struct g_part_parms *);
96 static int g_part_gpt_bootcode(struct g_part_table *, struct g_part_parms *);
97 static int g_part_gpt_create(struct g_part_table *, struct g_part_parms *);
98 static int g_part_gpt_destroy(struct g_part_table *, struct g_part_parms *);
99 static void g_part_gpt_dumpconf(struct g_part_table *, struct g_part_entry *,
100 struct sbuf *, const char *);
101 static int g_part_gpt_dumpto(struct g_part_table *, struct g_part_entry *);
102 static int g_part_gpt_modify(struct g_part_table *, struct g_part_entry *,
103 struct g_part_parms *);
104 static const char *g_part_gpt_name(struct g_part_table *, struct g_part_entry *,
106 static int g_part_gpt_probe(struct g_part_table *, struct g_consumer *);
107 static int g_part_gpt_read(struct g_part_table *, struct g_consumer *);
108 static int g_part_gpt_setunset(struct g_part_table *table,
109 struct g_part_entry *baseentry, const char *attrib, unsigned int set);
110 static const char *g_part_gpt_type(struct g_part_table *, struct g_part_entry *,
112 static int g_part_gpt_write(struct g_part_table *, struct g_consumer *);
113 static int g_part_gpt_resize(struct g_part_table *, struct g_part_entry *,
114 struct g_part_parms *);
115 static int g_part_gpt_recover(struct g_part_table *);
117 static kobj_method_t g_part_gpt_methods[] = {
118 KOBJMETHOD(g_part_add, g_part_gpt_add),
119 KOBJMETHOD(g_part_bootcode, g_part_gpt_bootcode),
120 KOBJMETHOD(g_part_create, g_part_gpt_create),
121 KOBJMETHOD(g_part_destroy, g_part_gpt_destroy),
122 KOBJMETHOD(g_part_dumpconf, g_part_gpt_dumpconf),
123 KOBJMETHOD(g_part_dumpto, g_part_gpt_dumpto),
124 KOBJMETHOD(g_part_modify, g_part_gpt_modify),
125 KOBJMETHOD(g_part_resize, g_part_gpt_resize),
126 KOBJMETHOD(g_part_name, g_part_gpt_name),
127 KOBJMETHOD(g_part_probe, g_part_gpt_probe),
128 KOBJMETHOD(g_part_read, g_part_gpt_read),
129 KOBJMETHOD(g_part_recover, g_part_gpt_recover),
130 KOBJMETHOD(g_part_setunset, g_part_gpt_setunset),
131 KOBJMETHOD(g_part_type, g_part_gpt_type),
132 KOBJMETHOD(g_part_write, g_part_gpt_write),
136 static struct g_part_scheme g_part_gpt_scheme = {
139 sizeof(struct g_part_gpt_table),
140 .gps_entrysz = sizeof(struct g_part_gpt_entry),
143 .gps_bootcodesz = MBRSIZE,
145 G_PART_SCHEME_DECLARE(g_part_gpt);
147 static struct uuid gpt_uuid_apple_boot = GPT_ENT_TYPE_APPLE_BOOT;
148 static struct uuid gpt_uuid_apple_hfs = GPT_ENT_TYPE_APPLE_HFS;
149 static struct uuid gpt_uuid_apple_label = GPT_ENT_TYPE_APPLE_LABEL;
150 static struct uuid gpt_uuid_apple_raid = GPT_ENT_TYPE_APPLE_RAID;
151 static struct uuid gpt_uuid_apple_raid_offline = GPT_ENT_TYPE_APPLE_RAID_OFFLINE;
152 static struct uuid gpt_uuid_apple_tv_recovery = GPT_ENT_TYPE_APPLE_TV_RECOVERY;
153 static struct uuid gpt_uuid_apple_ufs = GPT_ENT_TYPE_APPLE_UFS;
154 static struct uuid gpt_uuid_bios_boot = GPT_ENT_TYPE_BIOS_BOOT;
155 static struct uuid gpt_uuid_efi = GPT_ENT_TYPE_EFI;
156 static struct uuid gpt_uuid_freebsd = GPT_ENT_TYPE_FREEBSD;
157 static struct uuid gpt_uuid_freebsd_boot = GPT_ENT_TYPE_FREEBSD_BOOT;
158 static struct uuid gpt_uuid_freebsd_nandfs = GPT_ENT_TYPE_FREEBSD_NANDFS;
159 static struct uuid gpt_uuid_freebsd_swap = GPT_ENT_TYPE_FREEBSD_SWAP;
160 static struct uuid gpt_uuid_freebsd_ufs = GPT_ENT_TYPE_FREEBSD_UFS;
161 static struct uuid gpt_uuid_freebsd_vinum = GPT_ENT_TYPE_FREEBSD_VINUM;
162 static struct uuid gpt_uuid_freebsd_zfs = GPT_ENT_TYPE_FREEBSD_ZFS;
163 static struct uuid gpt_uuid_linux_data = GPT_ENT_TYPE_LINUX_DATA;
164 static struct uuid gpt_uuid_linux_lvm = GPT_ENT_TYPE_LINUX_LVM;
165 static struct uuid gpt_uuid_linux_raid = GPT_ENT_TYPE_LINUX_RAID;
166 static struct uuid gpt_uuid_linux_swap = GPT_ENT_TYPE_LINUX_SWAP;
167 static struct uuid gpt_uuid_vmfs = GPT_ENT_TYPE_VMFS;
168 static struct uuid gpt_uuid_vmkdiag = GPT_ENT_TYPE_VMKDIAG;
169 static struct uuid gpt_uuid_vmreserved = GPT_ENT_TYPE_VMRESERVED;
170 static struct uuid gpt_uuid_ms_basic_data = GPT_ENT_TYPE_MS_BASIC_DATA;
171 static struct uuid gpt_uuid_ms_reserved = GPT_ENT_TYPE_MS_RESERVED;
172 static struct uuid gpt_uuid_ms_ldm_data = GPT_ENT_TYPE_MS_LDM_DATA;
173 static struct uuid gpt_uuid_ms_ldm_metadata = GPT_ENT_TYPE_MS_LDM_METADATA;
174 static struct uuid gpt_uuid_netbsd_ccd = GPT_ENT_TYPE_NETBSD_CCD;
175 static struct uuid gpt_uuid_netbsd_cgd = GPT_ENT_TYPE_NETBSD_CGD;
176 static struct uuid gpt_uuid_netbsd_ffs = GPT_ENT_TYPE_NETBSD_FFS;
177 static struct uuid gpt_uuid_netbsd_lfs = GPT_ENT_TYPE_NETBSD_LFS;
178 static struct uuid gpt_uuid_netbsd_raid = GPT_ENT_TYPE_NETBSD_RAID;
179 static struct uuid gpt_uuid_netbsd_swap = GPT_ENT_TYPE_NETBSD_SWAP;
180 static struct uuid gpt_uuid_mbr = GPT_ENT_TYPE_MBR;
181 static struct uuid gpt_uuid_unused = GPT_ENT_TYPE_UNUSED;
183 static struct g_part_uuid_alias {
187 } gpt_uuid_alias_match[] = {
188 { &gpt_uuid_apple_boot, G_PART_ALIAS_APPLE_BOOT, 0xab },
189 { &gpt_uuid_apple_hfs, G_PART_ALIAS_APPLE_HFS, 0xaf },
190 { &gpt_uuid_apple_label, G_PART_ALIAS_APPLE_LABEL, 0 },
191 { &gpt_uuid_apple_raid, G_PART_ALIAS_APPLE_RAID, 0 },
192 { &gpt_uuid_apple_raid_offline, G_PART_ALIAS_APPLE_RAID_OFFLINE, 0 },
193 { &gpt_uuid_apple_tv_recovery, G_PART_ALIAS_APPLE_TV_RECOVERY, 0 },
194 { &gpt_uuid_apple_ufs, G_PART_ALIAS_APPLE_UFS, 0 },
195 { &gpt_uuid_bios_boot, G_PART_ALIAS_BIOS_BOOT, 0 },
196 { &gpt_uuid_efi, G_PART_ALIAS_EFI, 0xee },
197 { &gpt_uuid_freebsd, G_PART_ALIAS_FREEBSD, 0xa5 },
198 { &gpt_uuid_freebsd_boot, G_PART_ALIAS_FREEBSD_BOOT, 0 },
199 { &gpt_uuid_freebsd_nandfs, G_PART_ALIAS_FREEBSD_NANDFS, 0 },
200 { &gpt_uuid_freebsd_swap, G_PART_ALIAS_FREEBSD_SWAP, 0 },
201 { &gpt_uuid_freebsd_ufs, G_PART_ALIAS_FREEBSD_UFS, 0 },
202 { &gpt_uuid_freebsd_vinum, G_PART_ALIAS_FREEBSD_VINUM, 0 },
203 { &gpt_uuid_freebsd_zfs, G_PART_ALIAS_FREEBSD_ZFS, 0 },
204 { &gpt_uuid_linux_data, G_PART_ALIAS_LINUX_DATA, 0x0b },
205 { &gpt_uuid_linux_lvm, G_PART_ALIAS_LINUX_LVM, 0 },
206 { &gpt_uuid_linux_raid, G_PART_ALIAS_LINUX_RAID, 0 },
207 { &gpt_uuid_linux_swap, G_PART_ALIAS_LINUX_SWAP, 0 },
208 { &gpt_uuid_vmfs, G_PART_ALIAS_VMFS, 0 },
209 { &gpt_uuid_vmkdiag, G_PART_ALIAS_VMKDIAG, 0 },
210 { &gpt_uuid_vmreserved, G_PART_ALIAS_VMRESERVED, 0 },
211 { &gpt_uuid_mbr, G_PART_ALIAS_MBR, 0 },
212 { &gpt_uuid_ms_basic_data, G_PART_ALIAS_MS_BASIC_DATA, 0x0b },
213 { &gpt_uuid_ms_ldm_data, G_PART_ALIAS_MS_LDM_DATA, 0 },
214 { &gpt_uuid_ms_ldm_metadata, G_PART_ALIAS_MS_LDM_METADATA, 0 },
215 { &gpt_uuid_ms_reserved, G_PART_ALIAS_MS_RESERVED, 0 },
216 { &gpt_uuid_netbsd_ccd, G_PART_ALIAS_NETBSD_CCD, 0 },
217 { &gpt_uuid_netbsd_cgd, G_PART_ALIAS_NETBSD_CGD, 0 },
218 { &gpt_uuid_netbsd_ffs, G_PART_ALIAS_NETBSD_FFS, 0 },
219 { &gpt_uuid_netbsd_lfs, G_PART_ALIAS_NETBSD_LFS, 0 },
220 { &gpt_uuid_netbsd_raid, G_PART_ALIAS_NETBSD_RAID, 0 },
221 { &gpt_uuid_netbsd_swap, G_PART_ALIAS_NETBSD_SWAP, 0 },
226 gpt_write_mbr_entry(u_char *mbr, int idx, int typ, quad_t start,
230 if (typ == 0 || start > UINT32_MAX || end > UINT32_MAX)
233 mbr += DOSPARTOFF + idx * DOSPARTSIZE;
237 * Treat the PMBR partition specially to maximize
238 * interoperability with BIOSes.
243 mbr[1] = mbr[2] = mbr[3] = 0xff;
245 mbr[5] = mbr[6] = mbr[7] = 0xff;
246 le32enc(mbr + 8, (uint32_t)start);
247 le32enc(mbr + 12, (uint32_t)(end - start + 1));
252 gpt_map_type(struct uuid *t)
254 struct g_part_uuid_alias *uap;
256 for (uap = &gpt_uuid_alias_match[0]; uap->uuid; uap++) {
257 if (EQUUID(t, uap->uuid))
258 return (uap->mbrtype);
264 * Under Boot Camp the PMBR partition (type 0xEE) doesn't cover the
265 * whole disk anymore. Rather, it covers the GPT table and the EFI
266 * system partition only. This way the HFS+ partition and any FAT
267 * partitions can be added to the MBR without creating an overlap.
270 gpt_is_bootcamp(struct g_part_gpt_table *table, const char *provname)
274 p = table->mbr + DOSPARTOFF;
275 if (p[4] != 0xee || le32dec(p + 8) != 1)
282 printf("GEOM: %s: enabling Boot Camp\n", provname);
287 gpt_update_bootcamp(struct g_part_table *basetable)
289 struct g_part_entry *baseentry;
290 struct g_part_gpt_entry *entry;
291 struct g_part_gpt_table *table;
292 int bootable, error, index, slices, typ;
294 table = (struct g_part_gpt_table *)basetable;
297 for (index = 0; index < NDOSPART; index++) {
298 if (table->mbr[DOSPARTOFF + DOSPARTSIZE * index])
302 bzero(table->mbr + DOSPARTOFF, DOSPARTSIZE * NDOSPART);
304 LIST_FOREACH(baseentry, &basetable->gpt_entry, gpe_entry) {
305 if (baseentry->gpe_deleted)
307 index = baseentry->gpe_index - 1;
308 if (index >= NDOSPART)
311 entry = (struct g_part_gpt_entry *)baseentry;
314 case 0: /* This must be the EFI system partition. */
315 if (!EQUUID(&entry->ent.ent_type, &gpt_uuid_efi))
317 error = gpt_write_mbr_entry(table->mbr, index, 0xee,
318 1ull, entry->ent.ent_lba_end);
320 case 1: /* This must be the HFS+ partition. */
321 if (!EQUUID(&entry->ent.ent_type, &gpt_uuid_apple_hfs))
323 error = gpt_write_mbr_entry(table->mbr, index, 0xaf,
324 entry->ent.ent_lba_start, entry->ent.ent_lba_end);
327 typ = gpt_map_type(&entry->ent.ent_type);
328 error = gpt_write_mbr_entry(table->mbr, index, typ,
329 entry->ent.ent_lba_start, entry->ent.ent_lba_end);
335 if (index == bootable)
336 table->mbr[DOSPARTOFF + DOSPARTSIZE * index] = 0x80;
337 slices |= 1 << index;
339 if ((slices & 3) == 3)
346 static struct gpt_hdr *
347 gpt_read_hdr(struct g_part_gpt_table *table, struct g_consumer *cp,
350 struct gpt_hdr *buf, *hdr;
351 struct g_provider *pp;
357 last = (pp->mediasize / pp->sectorsize) - 1;
358 table->state[elt] = GPT_STATE_MISSING;
360 * If the primary header is valid look for secondary
361 * header in AlternateLBA, otherwise in the last medium's LBA.
363 if (elt == GPT_ELT_SECHDR) {
364 if (table->state[GPT_ELT_PRIHDR] != GPT_STATE_OK)
365 table->lba[elt] = last;
368 buf = g_read_data(cp, table->lba[elt] * pp->sectorsize, pp->sectorsize,
373 if (memcmp(buf->hdr_sig, GPT_HDR_SIG, sizeof(buf->hdr_sig)) != 0)
376 table->state[elt] = GPT_STATE_CORRUPT;
377 sz = le32toh(buf->hdr_size);
378 if (sz < 92 || sz > pp->sectorsize)
381 hdr = g_malloc(sz, M_WAITOK | M_ZERO);
385 crc = le32toh(buf->hdr_crc_self);
386 buf->hdr_crc_self = 0;
387 if (crc32(buf, sz) != crc)
389 hdr->hdr_crc_self = crc;
391 table->state[elt] = GPT_STATE_INVALID;
392 hdr->hdr_revision = le32toh(buf->hdr_revision);
393 if (hdr->hdr_revision < GPT_HDR_REVISION)
395 hdr->hdr_lba_self = le64toh(buf->hdr_lba_self);
396 if (hdr->hdr_lba_self != table->lba[elt])
398 hdr->hdr_lba_alt = le64toh(buf->hdr_lba_alt);
399 if (hdr->hdr_lba_alt == hdr->hdr_lba_self ||
400 hdr->hdr_lba_alt > last)
403 /* Check the managed area. */
404 hdr->hdr_lba_start = le64toh(buf->hdr_lba_start);
405 if (hdr->hdr_lba_start < 2 || hdr->hdr_lba_start >= last)
407 hdr->hdr_lba_end = le64toh(buf->hdr_lba_end);
408 if (hdr->hdr_lba_end < hdr->hdr_lba_start || hdr->hdr_lba_end >= last)
411 /* Check the table location and size of the table. */
412 hdr->hdr_entries = le32toh(buf->hdr_entries);
413 hdr->hdr_entsz = le32toh(buf->hdr_entsz);
414 if (hdr->hdr_entries == 0 || hdr->hdr_entsz < 128 ||
415 (hdr->hdr_entsz & 7) != 0)
417 hdr->hdr_lba_table = le64toh(buf->hdr_lba_table);
418 if (hdr->hdr_lba_table < 2 || hdr->hdr_lba_table >= last)
420 if (hdr->hdr_lba_table >= hdr->hdr_lba_start &&
421 hdr->hdr_lba_table <= hdr->hdr_lba_end)
423 lba = hdr->hdr_lba_table +
424 (hdr->hdr_entries * hdr->hdr_entsz + pp->sectorsize - 1) /
428 if (lba >= hdr->hdr_lba_start && lba <= hdr->hdr_lba_end)
431 table->state[elt] = GPT_STATE_OK;
432 le_uuid_dec(&buf->hdr_uuid, &hdr->hdr_uuid);
433 hdr->hdr_crc_table = le32toh(buf->hdr_crc_table);
435 /* save LBA for secondary header */
436 if (elt == GPT_ELT_PRIHDR)
437 table->lba[GPT_ELT_SECHDR] = hdr->hdr_lba_alt;
449 static struct gpt_ent *
450 gpt_read_tbl(struct g_part_gpt_table *table, struct g_consumer *cp,
451 enum gpt_elt elt, struct gpt_hdr *hdr)
453 struct g_provider *pp;
454 struct gpt_ent *ent, *tbl;
456 unsigned int idx, sectors, tblsz, size;
463 table->lba[elt] = hdr->hdr_lba_table;
465 table->state[elt] = GPT_STATE_MISSING;
466 tblsz = hdr->hdr_entries * hdr->hdr_entsz;
467 sectors = (tblsz + pp->sectorsize - 1) / pp->sectorsize;
468 buf = g_malloc(sectors * pp->sectorsize, M_WAITOK | M_ZERO);
469 for (idx = 0; idx < sectors; idx += MAXPHYS / pp->sectorsize) {
470 size = (sectors - idx > MAXPHYS / pp->sectorsize) ? MAXPHYS:
471 (sectors - idx) * pp->sectorsize;
472 p = g_read_data(cp, (table->lba[elt] + idx) * pp->sectorsize,
478 bcopy(p, buf + idx * pp->sectorsize, size);
481 table->state[elt] = GPT_STATE_CORRUPT;
482 if (crc32(buf, tblsz) != hdr->hdr_crc_table) {
487 table->state[elt] = GPT_STATE_OK;
488 tbl = g_malloc(hdr->hdr_entries * sizeof(struct gpt_ent),
491 for (idx = 0, ent = tbl, p = buf;
492 idx < hdr->hdr_entries;
493 idx++, ent++, p += hdr->hdr_entsz) {
494 le_uuid_dec(p, &ent->ent_type);
495 le_uuid_dec(p + 16, &ent->ent_uuid);
496 ent->ent_lba_start = le64dec(p + 32);
497 ent->ent_lba_end = le64dec(p + 40);
498 ent->ent_attr = le64dec(p + 48);
499 /* Keep UTF-16 in little-endian. */
500 bcopy(p + 56, ent->ent_name, sizeof(ent->ent_name));
508 gpt_matched_hdrs(struct gpt_hdr *pri, struct gpt_hdr *sec)
511 if (pri == NULL || sec == NULL)
514 if (!EQUUID(&pri->hdr_uuid, &sec->hdr_uuid))
516 return ((pri->hdr_revision == sec->hdr_revision &&
517 pri->hdr_size == sec->hdr_size &&
518 pri->hdr_lba_start == sec->hdr_lba_start &&
519 pri->hdr_lba_end == sec->hdr_lba_end &&
520 pri->hdr_entries == sec->hdr_entries &&
521 pri->hdr_entsz == sec->hdr_entsz &&
522 pri->hdr_crc_table == sec->hdr_crc_table) ? 1 : 0);
526 gpt_parse_type(const char *type, struct uuid *uuid)
531 struct g_part_uuid_alias *uap;
533 if (type[0] == '!') {
534 error = parse_uuid(type + 1, &tmp);
537 if (EQUUID(&tmp, &gpt_uuid_unused))
542 for (uap = &gpt_uuid_alias_match[0]; uap->uuid; uap++) {
543 alias = g_part_alias_name(uap->alias);
544 if (!strcasecmp(type, alias)) {
553 g_part_gpt_add(struct g_part_table *basetable, struct g_part_entry *baseentry,
554 struct g_part_parms *gpp)
556 struct g_part_gpt_entry *entry;
559 entry = (struct g_part_gpt_entry *)baseentry;
560 error = gpt_parse_type(gpp->gpp_type, &entry->ent.ent_type);
563 kern_uuidgen(&entry->ent.ent_uuid, 1);
564 entry->ent.ent_lba_start = baseentry->gpe_start;
565 entry->ent.ent_lba_end = baseentry->gpe_end;
566 if (baseentry->gpe_deleted) {
567 entry->ent.ent_attr = 0;
568 bzero(entry->ent.ent_name, sizeof(entry->ent.ent_name));
570 if (gpp->gpp_parms & G_PART_PARM_LABEL)
571 g_gpt_utf8_to_utf16(gpp->gpp_label, entry->ent.ent_name,
572 sizeof(entry->ent.ent_name) /
573 sizeof(entry->ent.ent_name[0]));
578 g_part_gpt_bootcode(struct g_part_table *basetable, struct g_part_parms *gpp)
580 struct g_part_gpt_table *table;
584 table = (struct g_part_gpt_table *)basetable;
585 bzero(table->mbr, codesz);
586 codesz = MIN(codesz, gpp->gpp_codesize);
588 bcopy(gpp->gpp_codeptr, table->mbr, codesz);
593 g_part_gpt_create(struct g_part_table *basetable, struct g_part_parms *gpp)
595 struct g_provider *pp;
596 struct g_part_gpt_table *table;
599 /* We don't nest, which means that our depth should be 0. */
600 if (basetable->gpt_depth != 0)
603 table = (struct g_part_gpt_table *)basetable;
604 pp = gpp->gpp_provider;
605 tblsz = (basetable->gpt_entries * sizeof(struct gpt_ent) +
606 pp->sectorsize - 1) / pp->sectorsize;
607 if (pp->sectorsize < MBRSIZE ||
608 pp->mediasize < (3 + 2 * tblsz + basetable->gpt_entries) *
612 /* Allocate space for the header */
613 table->hdr = g_malloc(sizeof(struct gpt_hdr), M_WAITOK | M_ZERO);
615 bcopy(GPT_HDR_SIG, table->hdr->hdr_sig, sizeof(table->hdr->hdr_sig));
616 table->hdr->hdr_revision = GPT_HDR_REVISION;
617 table->hdr->hdr_size = offsetof(struct gpt_hdr, padding);
618 kern_uuidgen(&table->hdr->hdr_uuid, 1);
619 table->hdr->hdr_entries = basetable->gpt_entries;
620 table->hdr->hdr_entsz = sizeof(struct gpt_ent);
622 g_gpt_set_defaults(basetable, pp);
627 g_part_gpt_destroy(struct g_part_table *basetable, struct g_part_parms *gpp)
629 struct g_part_gpt_table *table;
630 struct g_provider *pp;
632 table = (struct g_part_gpt_table *)basetable;
633 pp = LIST_FIRST(&basetable->gpt_gp->consumer)->provider;
638 * Wipe the first 2 sectors to clear the partitioning. Wipe the last
639 * sector only if it has valid secondary header.
641 basetable->gpt_smhead |= 3;
642 if (table->state[GPT_ELT_SECHDR] == GPT_STATE_OK &&
643 table->lba[GPT_ELT_SECHDR] == pp->mediasize / pp->sectorsize - 1)
644 basetable->gpt_smtail |= 1;
649 g_part_gpt_dumpconf(struct g_part_table *table, struct g_part_entry *baseentry,
650 struct sbuf *sb, const char *indent)
652 struct g_part_gpt_entry *entry;
654 entry = (struct g_part_gpt_entry *)baseentry;
655 if (indent == NULL) {
656 /* conftxt: libdisk compatibility */
657 sbuf_printf(sb, " xs GPT xt ");
658 sbuf_printf_uuid(sb, &entry->ent.ent_type);
659 } else if (entry != NULL) {
660 /* confxml: partition entry information */
661 sbuf_printf(sb, "%s<label>", indent);
662 g_gpt_printf_utf16(sb, entry->ent.ent_name,
663 sizeof(entry->ent.ent_name) >> 1);
664 sbuf_printf(sb, "</label>\n");
665 if (entry->ent.ent_attr & GPT_ENT_ATTR_BOOTME)
666 sbuf_printf(sb, "%s<attrib>bootme</attrib>\n", indent);
667 if (entry->ent.ent_attr & GPT_ENT_ATTR_BOOTONCE) {
668 sbuf_printf(sb, "%s<attrib>bootonce</attrib>\n",
671 if (entry->ent.ent_attr & GPT_ENT_ATTR_BOOTFAILED) {
672 sbuf_printf(sb, "%s<attrib>bootfailed</attrib>\n",
675 sbuf_printf(sb, "%s<rawtype>", indent);
676 sbuf_printf_uuid(sb, &entry->ent.ent_type);
677 sbuf_printf(sb, "</rawtype>\n");
678 sbuf_printf(sb, "%s<rawuuid>", indent);
679 sbuf_printf_uuid(sb, &entry->ent.ent_uuid);
680 sbuf_printf(sb, "</rawuuid>\n");
682 /* confxml: scheme information */
687 g_part_gpt_dumpto(struct g_part_table *table, struct g_part_entry *baseentry)
689 struct g_part_gpt_entry *entry;
691 entry = (struct g_part_gpt_entry *)baseentry;
692 return ((EQUUID(&entry->ent.ent_type, &gpt_uuid_freebsd_swap) ||
693 EQUUID(&entry->ent.ent_type, &gpt_uuid_linux_swap)) ? 1 : 0);
697 g_part_gpt_modify(struct g_part_table *basetable,
698 struct g_part_entry *baseentry, struct g_part_parms *gpp)
700 struct g_part_gpt_entry *entry;
703 entry = (struct g_part_gpt_entry *)baseentry;
704 if (gpp->gpp_parms & G_PART_PARM_TYPE) {
705 error = gpt_parse_type(gpp->gpp_type, &entry->ent.ent_type);
709 if (gpp->gpp_parms & G_PART_PARM_LABEL)
710 g_gpt_utf8_to_utf16(gpp->gpp_label, entry->ent.ent_name,
711 sizeof(entry->ent.ent_name) /
712 sizeof(entry->ent.ent_name[0]));
717 g_part_gpt_resize(struct g_part_table *basetable,
718 struct g_part_entry *baseentry, struct g_part_parms *gpp)
720 struct g_part_gpt_entry *entry;
721 entry = (struct g_part_gpt_entry *)baseentry;
723 baseentry->gpe_end = baseentry->gpe_start + gpp->gpp_size - 1;
724 entry->ent.ent_lba_end = baseentry->gpe_end;
730 g_part_gpt_name(struct g_part_table *table, struct g_part_entry *baseentry,
731 char *buf, size_t bufsz)
733 struct g_part_gpt_entry *entry;
736 entry = (struct g_part_gpt_entry *)baseentry;
737 c = (EQUUID(&entry->ent.ent_type, &gpt_uuid_freebsd)) ? 's' : 'p';
738 snprintf(buf, bufsz, "%c%d", c, baseentry->gpe_index);
743 g_part_gpt_probe(struct g_part_table *table, struct g_consumer *cp)
745 struct g_provider *pp;
749 /* We don't nest, which means that our depth should be 0. */
750 if (table->gpt_depth != 0)
756 * Sanity-check the provider. Since the first sector on the provider
757 * must be a PMBR and a PMBR is 512 bytes large, the sector size
758 * must be at least 512 bytes. Also, since the theoretical minimum
759 * number of sectors needed by GPT is 6, any medium that has less
760 * than 6 sectors is never going to be able to hold a GPT. The
761 * number 6 comes from:
762 * 1 sector for the PMBR
763 * 2 sectors for the GPT headers (each 1 sector)
764 * 2 sectors for the GPT tables (each 1 sector)
765 * 1 sector for an actual partition
766 * It's better to catch this pathological case early than behaving
767 * pathologically later on...
769 if (pp->sectorsize < MBRSIZE || pp->mediasize < 6 * pp->sectorsize)
772 /* Check that there's a MBR. */
773 buf = g_read_data(cp, 0L, pp->sectorsize, &error);
776 res = le16dec(buf + DOSMAGICOFFSET);
781 /* Check that there's a primary header. */
782 buf = g_read_data(cp, pp->sectorsize, pp->sectorsize, &error);
785 res = memcmp(buf, GPT_HDR_SIG, 8);
788 return (G_PART_PROBE_PRI_HIGH);
790 /* No primary? Check that there's a secondary. */
791 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
795 res = memcmp(buf, GPT_HDR_SIG, 8);
797 return ((res == 0) ? G_PART_PROBE_PRI_HIGH : ENXIO);
801 g_part_gpt_read(struct g_part_table *basetable, struct g_consumer *cp)
803 struct gpt_hdr *prihdr, *sechdr;
804 struct gpt_ent *tbl, *pritbl, *sectbl;
805 struct g_provider *pp;
806 struct g_part_gpt_table *table;
807 struct g_part_gpt_entry *entry;
812 table = (struct g_part_gpt_table *)basetable;
814 last = (pp->mediasize / pp->sectorsize) - 1;
817 buf = g_read_data(cp, 0, pp->sectorsize, &error);
820 bcopy(buf, table->mbr, MBRSIZE);
823 /* Read the primary header and table. */
824 prihdr = gpt_read_hdr(table, cp, GPT_ELT_PRIHDR);
825 if (table->state[GPT_ELT_PRIHDR] == GPT_STATE_OK) {
826 pritbl = gpt_read_tbl(table, cp, GPT_ELT_PRITBL, prihdr);
828 table->state[GPT_ELT_PRITBL] = GPT_STATE_MISSING;
832 /* Read the secondary header and table. */
833 sechdr = gpt_read_hdr(table, cp, GPT_ELT_SECHDR);
834 if (table->state[GPT_ELT_SECHDR] == GPT_STATE_OK) {
835 sectbl = gpt_read_tbl(table, cp, GPT_ELT_SECTBL, sechdr);
837 table->state[GPT_ELT_SECTBL] = GPT_STATE_MISSING;
841 /* Fail if we haven't got any good tables at all. */
842 if (table->state[GPT_ELT_PRITBL] != GPT_STATE_OK &&
843 table->state[GPT_ELT_SECTBL] != GPT_STATE_OK) {
844 printf("GEOM: %s: corrupt or invalid GPT detected.\n",
846 printf("GEOM: %s: GPT rejected -- may not be recoverable.\n",
852 * If both headers are good but they disagree with each other,
853 * then invalidate one. We prefer to keep the primary header,
854 * unless the primary table is corrupt.
856 if (table->state[GPT_ELT_PRIHDR] == GPT_STATE_OK &&
857 table->state[GPT_ELT_SECHDR] == GPT_STATE_OK &&
858 !gpt_matched_hdrs(prihdr, sechdr)) {
859 if (table->state[GPT_ELT_PRITBL] == GPT_STATE_OK) {
860 table->state[GPT_ELT_SECHDR] = GPT_STATE_INVALID;
861 table->state[GPT_ELT_SECTBL] = GPT_STATE_MISSING;
865 table->state[GPT_ELT_PRIHDR] = GPT_STATE_INVALID;
866 table->state[GPT_ELT_PRITBL] = GPT_STATE_MISSING;
872 if (table->state[GPT_ELT_PRITBL] != GPT_STATE_OK) {
873 printf("GEOM: %s: the primary GPT table is corrupt or "
874 "invalid.\n", pp->name);
875 printf("GEOM: %s: using the secondary instead -- recovery "
876 "strongly advised.\n", pp->name);
878 basetable->gpt_corrupt = 1;
885 if (table->state[GPT_ELT_SECTBL] != GPT_STATE_OK) {
886 printf("GEOM: %s: the secondary GPT table is corrupt "
887 "or invalid.\n", pp->name);
888 printf("GEOM: %s: using the primary only -- recovery "
889 "suggested.\n", pp->name);
890 basetable->gpt_corrupt = 1;
891 } else if (table->lba[GPT_ELT_SECHDR] != last) {
892 printf( "GEOM: %s: the secondary GPT header is not in "
893 "the last LBA.\n", pp->name);
894 basetable->gpt_corrupt = 1;
904 basetable->gpt_first = table->hdr->hdr_lba_start;
905 basetable->gpt_last = table->hdr->hdr_lba_end;
906 basetable->gpt_entries = table->hdr->hdr_entries;
908 for (index = basetable->gpt_entries - 1; index >= 0; index--) {
909 if (EQUUID(&tbl[index].ent_type, &gpt_uuid_unused))
911 entry = (struct g_part_gpt_entry *)g_part_new_entry(
912 basetable, index + 1, tbl[index].ent_lba_start,
913 tbl[index].ent_lba_end);
914 entry->ent = tbl[index];
920 * Under Mac OS X, the MBR mirrors the first 4 GPT partitions
921 * if (and only if) any FAT32 or FAT16 partitions have been
922 * created. This happens irrespective of whether Boot Camp is
923 * used/enabled, though it's generally understood to be done
924 * to support legacy Windows under Boot Camp. We refer to this
925 * mirroring simply as Boot Camp. We try to detect Boot Camp
926 * so that we can update the MBR if and when GPT changes have
927 * been made. Note that we do not enable Boot Camp if not
928 * previously enabled because we can't assume that we're on a
929 * Mac alongside Mac OS X.
931 table->bootcamp = gpt_is_bootcamp(table, pp->name);
937 g_part_gpt_recover(struct g_part_table *basetable)
940 g_gpt_set_defaults(basetable,
941 LIST_FIRST(&basetable->gpt_gp->consumer)->provider);
942 basetable->gpt_corrupt = 0;
947 g_part_gpt_setunset(struct g_part_table *basetable,
948 struct g_part_entry *baseentry, const char *attrib, unsigned int set)
950 struct g_part_gpt_entry *entry;
951 struct g_part_gpt_table *table;
955 table = (struct g_part_gpt_table *)basetable;
956 entry = (struct g_part_gpt_entry *)baseentry;
958 if (strcasecmp(attrib, "active") == 0) {
959 if (!table->bootcamp || baseentry->gpe_index > NDOSPART)
961 for (i = 0; i < NDOSPART; i++) {
962 table->mbr[DOSPARTOFF + i * DOSPARTSIZE] =
963 (i == baseentry->gpe_index - 1) ? 0x80 : 0;
969 if (strcasecmp(attrib, "bootme") == 0) {
970 attr |= GPT_ENT_ATTR_BOOTME;
971 } else if (strcasecmp(attrib, "bootonce") == 0) {
972 attr |= GPT_ENT_ATTR_BOOTONCE;
974 attr |= GPT_ENT_ATTR_BOOTME;
975 } else if (strcasecmp(attrib, "bootfailed") == 0) {
977 * It should only be possible to unset BOOTFAILED, but it might
978 * be useful for test purposes to also be able to set it.
980 attr |= GPT_ENT_ATTR_BOOTFAILED;
986 attr = entry->ent.ent_attr | attr;
988 attr = entry->ent.ent_attr & ~attr;
989 if (attr != entry->ent.ent_attr) {
990 entry->ent.ent_attr = attr;
991 if (!baseentry->gpe_created)
992 baseentry->gpe_modified = 1;
998 g_part_gpt_type(struct g_part_table *basetable, struct g_part_entry *baseentry,
999 char *buf, size_t bufsz)
1001 struct g_part_gpt_entry *entry;
1003 struct g_part_uuid_alias *uap;
1005 entry = (struct g_part_gpt_entry *)baseentry;
1006 type = &entry->ent.ent_type;
1007 for (uap = &gpt_uuid_alias_match[0]; uap->uuid; uap++)
1008 if (EQUUID(type, uap->uuid))
1009 return (g_part_alias_name(uap->alias));
1011 snprintf_uuid(buf + 1, bufsz - 1, type);
1017 g_part_gpt_write(struct g_part_table *basetable, struct g_consumer *cp)
1019 unsigned char *buf, *bp;
1020 struct g_provider *pp;
1021 struct g_part_entry *baseentry;
1022 struct g_part_gpt_entry *entry;
1023 struct g_part_gpt_table *table;
1029 table = (struct g_part_gpt_table *)basetable;
1030 tblsz = (table->hdr->hdr_entries * table->hdr->hdr_entsz +
1031 pp->sectorsize - 1) / pp->sectorsize;
1033 /* Reconstruct the MBR from the GPT if under Boot Camp. */
1034 if (table->bootcamp)
1035 gpt_update_bootcamp(basetable);
1037 /* Update partition entries in the PMBR if Boot Camp disabled. */
1038 if (!table->bootcamp) {
1039 bzero(table->mbr + DOSPARTOFF, DOSPARTSIZE * NDOSPART);
1040 gpt_write_mbr_entry(table->mbr, 0, 0xee, 1,
1041 MIN(pp->mediasize / pp->sectorsize - 1, UINT32_MAX));
1042 /* Mark the PMBR active since some BIOS require it. */
1043 table->mbr[DOSPARTOFF] = 0x80;
1045 le16enc(table->mbr + DOSMAGICOFFSET, DOSMAGIC);
1047 /* Write the PMBR */
1048 buf = g_malloc(pp->sectorsize, M_WAITOK | M_ZERO);
1049 bcopy(table->mbr, buf, MBRSIZE);
1050 error = g_write_data(cp, 0, buf, pp->sectorsize);
1055 /* Allocate space for the header and entries. */
1056 buf = g_malloc((tblsz + 1) * pp->sectorsize, M_WAITOK | M_ZERO);
1058 memcpy(buf, table->hdr->hdr_sig, sizeof(table->hdr->hdr_sig));
1059 le32enc(buf + 8, table->hdr->hdr_revision);
1060 le32enc(buf + 12, table->hdr->hdr_size);
1061 le64enc(buf + 40, table->hdr->hdr_lba_start);
1062 le64enc(buf + 48, table->hdr->hdr_lba_end);
1063 le_uuid_enc(buf + 56, &table->hdr->hdr_uuid);
1064 le32enc(buf + 80, table->hdr->hdr_entries);
1065 le32enc(buf + 84, table->hdr->hdr_entsz);
1067 LIST_FOREACH(baseentry, &basetable->gpt_entry, gpe_entry) {
1068 if (baseentry->gpe_deleted)
1070 entry = (struct g_part_gpt_entry *)baseentry;
1071 index = baseentry->gpe_index - 1;
1072 bp = buf + pp->sectorsize + table->hdr->hdr_entsz * index;
1073 le_uuid_enc(bp, &entry->ent.ent_type);
1074 le_uuid_enc(bp + 16, &entry->ent.ent_uuid);
1075 le64enc(bp + 32, entry->ent.ent_lba_start);
1076 le64enc(bp + 40, entry->ent.ent_lba_end);
1077 le64enc(bp + 48, entry->ent.ent_attr);
1078 memcpy(bp + 56, entry->ent.ent_name,
1079 sizeof(entry->ent.ent_name));
1082 crc = crc32(buf + pp->sectorsize,
1083 table->hdr->hdr_entries * table->hdr->hdr_entsz);
1084 le32enc(buf + 88, crc);
1086 /* Write primary meta-data. */
1087 le32enc(buf + 16, 0); /* hdr_crc_self. */
1088 le64enc(buf + 24, table->lba[GPT_ELT_PRIHDR]); /* hdr_lba_self. */
1089 le64enc(buf + 32, table->lba[GPT_ELT_SECHDR]); /* hdr_lba_alt. */
1090 le64enc(buf + 72, table->lba[GPT_ELT_PRITBL]); /* hdr_lba_table. */
1091 crc = crc32(buf, table->hdr->hdr_size);
1092 le32enc(buf + 16, crc);
1094 for (index = 0; index < tblsz; index += MAXPHYS / pp->sectorsize) {
1095 error = g_write_data(cp,
1096 (table->lba[GPT_ELT_PRITBL] + index) * pp->sectorsize,
1097 buf + (index + 1) * pp->sectorsize,
1098 (tblsz - index > MAXPHYS / pp->sectorsize) ? MAXPHYS:
1099 (tblsz - index) * pp->sectorsize);
1103 error = g_write_data(cp, table->lba[GPT_ELT_PRIHDR] * pp->sectorsize,
1104 buf, pp->sectorsize);
1108 /* Write secondary meta-data. */
1109 le32enc(buf + 16, 0); /* hdr_crc_self. */
1110 le64enc(buf + 24, table->lba[GPT_ELT_SECHDR]); /* hdr_lba_self. */
1111 le64enc(buf + 32, table->lba[GPT_ELT_PRIHDR]); /* hdr_lba_alt. */
1112 le64enc(buf + 72, table->lba[GPT_ELT_SECTBL]); /* hdr_lba_table. */
1113 crc = crc32(buf, table->hdr->hdr_size);
1114 le32enc(buf + 16, crc);
1116 for (index = 0; index < tblsz; index += MAXPHYS / pp->sectorsize) {
1117 error = g_write_data(cp,
1118 (table->lba[GPT_ELT_SECTBL] + index) * pp->sectorsize,
1119 buf + (index + 1) * pp->sectorsize,
1120 (tblsz - index > MAXPHYS / pp->sectorsize) ? MAXPHYS:
1121 (tblsz - index) * pp->sectorsize);
1125 error = g_write_data(cp, table->lba[GPT_ELT_SECHDR] * pp->sectorsize,
1126 buf, pp->sectorsize);
1134 g_gpt_set_defaults(struct g_part_table *basetable, struct g_provider *pp)
1136 struct g_part_gpt_table *table;
1140 table = (struct g_part_gpt_table *)basetable;
1141 last = pp->mediasize / pp->sectorsize - 1;
1142 tblsz = (basetable->gpt_entries * sizeof(struct gpt_ent) +
1143 pp->sectorsize - 1) / pp->sectorsize;
1145 table->lba[GPT_ELT_PRIHDR] = 1;
1146 table->lba[GPT_ELT_PRITBL] = 2;
1147 table->lba[GPT_ELT_SECHDR] = last;
1148 table->lba[GPT_ELT_SECTBL] = last - tblsz;
1149 table->state[GPT_ELT_PRIHDR] = GPT_STATE_OK;
1150 table->state[GPT_ELT_PRITBL] = GPT_STATE_OK;
1151 table->state[GPT_ELT_SECHDR] = GPT_STATE_OK;
1152 table->state[GPT_ELT_SECTBL] = GPT_STATE_OK;
1154 table->hdr->hdr_lba_start = 2 + tblsz;
1155 table->hdr->hdr_lba_end = last - tblsz - 1;
1157 basetable->gpt_first = table->hdr->hdr_lba_start;
1158 basetable->gpt_last = table->hdr->hdr_lba_end;
1162 g_gpt_printf_utf16(struct sbuf *sb, uint16_t *str, size_t len)
1168 bo = LITTLE_ENDIAN; /* GPT is little-endian */
1169 while (len > 0 && *str != 0) {
1170 ch = (bo == BIG_ENDIAN) ? be16toh(*str) : le16toh(*str);
1172 if ((ch & 0xf800) == 0xd800) {
1174 c = (bo == BIG_ENDIAN) ? be16toh(*str)
1179 if ((ch & 0x400) == 0 && (c & 0xfc00) == 0xdc00) {
1180 ch = ((ch & 0x3ff) << 10) + (c & 0x3ff);
1184 } else if (ch == 0xfffe) { /* BOM (U+FEFF) swapped. */
1185 bo = (bo == BIG_ENDIAN) ? LITTLE_ENDIAN : BIG_ENDIAN;
1187 } else if (ch == 0xfeff) /* BOM (U+FEFF) unswapped. */
1190 /* Write the Unicode character in UTF-8 */
1192 sbuf_printf(sb, "%c", ch);
1193 else if (ch < 0x800)
1194 sbuf_printf(sb, "%c%c", 0xc0 | (ch >> 6),
1195 0x80 | (ch & 0x3f));
1196 else if (ch < 0x10000)
1197 sbuf_printf(sb, "%c%c%c", 0xe0 | (ch >> 12),
1198 0x80 | ((ch >> 6) & 0x3f), 0x80 | (ch & 0x3f));
1199 else if (ch < 0x200000)
1200 sbuf_printf(sb, "%c%c%c%c", 0xf0 | (ch >> 18),
1201 0x80 | ((ch >> 12) & 0x3f),
1202 0x80 | ((ch >> 6) & 0x3f), 0x80 | (ch & 0x3f));
1207 g_gpt_utf8_to_utf16(const uint8_t *s8, uint16_t *s16, size_t s16len)
1209 size_t s16idx, s8idx;
1211 unsigned int c, utfbytes;
1216 bzero(s16, s16len << 1);
1217 while (s8[s8idx] != 0 && s16idx < s16len) {
1219 if ((c & 0xc0) != 0x80) {
1220 /* Initial characters. */
1221 if (utfbytes != 0) {
1222 /* Incomplete encoding of previous char. */
1223 s16[s16idx++] = htole16(0xfffd);
1225 if ((c & 0xf8) == 0xf0) {
1228 } else if ((c & 0xf0) == 0xe0) {
1231 } else if ((c & 0xe0) == 0xc0) {
1239 /* Followup characters. */
1241 utfchar = (utfchar << 6) + (c & 0x3f);
1243 } else if (utfbytes == 0)
1247 * Write the complete Unicode character as UTF-16 when we
1248 * have all the UTF-8 charactars collected.
1250 if (utfbytes == 0) {
1252 * If we need to write 2 UTF-16 characters, but
1253 * we only have room for 1, then we truncate the
1254 * string by writing a 0 instead.
1256 if (utfchar >= 0x10000 && s16idx < s16len - 1) {
1258 htole16(0xd800 | ((utfchar >> 10) - 0x40));
1260 htole16(0xdc00 | (utfchar & 0x3ff));
1262 s16[s16idx++] = (utfchar >= 0x10000) ? 0 :
1267 * If our input string was truncated, append an invalid encoding
1268 * character to the output string.
1270 if (utfbytes != 0 && s16idx < s16len)
1271 s16[s16idx++] = htole16(0xfffd);