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author | Huang Ying <ying.huang@intel.com> | 2010-05-18 14:35:18 +0800 |
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committer | Len Brown <len.brown@intel.com> | 2010-05-19 22:40:47 -0400 |
commit | fab1c23242528771a955c475ef23d99156a71a7f (patch) | |
tree | 2d882ead41cd984628cbfc18c9a2a0a663539602 /lib/uuid.c | |
parent | 801eab8118f61255d8e2be35939c572042618742 (diff) | |
download | linux-3.10-fab1c23242528771a955c475ef23d99156a71a7f.tar.gz linux-3.10-fab1c23242528771a955c475ef23d99156a71a7f.tar.bz2 linux-3.10-fab1c23242528771a955c475ef23d99156a71a7f.zip |
Unified UUID/GUID definition
There are many different UUID/GUID definitions in kernel, such as that
in EFI, many file systems, some drivers, etc. Every kernel components
need UUID/GUID has its own definition. This patch provides a unified
definition for UUID/GUID.
UUID is defined via typedef. This makes that UUID appears more like a
preliminary type, and makes the data type explicit (comparing with
implicit "u8 uuid[16]").
The binary representation of UUID/GUID can be little-endian (used by
EFI, etc) or big-endian (defined by RFC4122), so both is defined.
Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'lib/uuid.c')
-rw-r--r-- | lib/uuid.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/lib/uuid.c b/lib/uuid.c new file mode 100644 index 00000000000..8fadd7cef46 --- /dev/null +++ b/lib/uuid.c @@ -0,0 +1,53 @@ +/* + * Unified UUID/GUID definition + * + * Copyright (C) 2009, Intel Corp. + * Huang Ying <ying.huang@intel.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License version + * 2 as published by the Free Software Foundation; + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/uuid.h> +#include <linux/random.h> + +static void __uuid_gen_common(__u8 b[16]) +{ + int i; + u32 r; + + for (i = 0; i < 4; i++) { + r = random32(); + memcpy(b + i * 4, &r, 4); + } + /* reversion 0b10 */ + b[8] = (b[8] & 0x3F) | 0x80; +} + +void uuid_le_gen(uuid_le *lu) +{ + __uuid_gen_common(lu->b); + /* version 4 : random generation */ + lu->b[7] = (lu->b[7] & 0x0F) | 0x40; +} +EXPORT_SYMBOL_GPL(uuid_le_gen); + +void uuid_be_gen(uuid_be *bu) +{ + __uuid_gen_common(bu->b); + /* version 4 : random generation */ + bu->b[6] = (bu->b[6] & 0x0F) | 0x40; +} +EXPORT_SYMBOL_GPL(uuid_be_gen); |