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fab1c23242
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>
54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
/*
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* Unified UUID/GUID definition
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*
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* Copyright (C) 2009, Intel Corp.
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* Huang Ying <ying.huang@intel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation;
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/uuid.h>
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#include <linux/random.h>
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static void __uuid_gen_common(__u8 b[16])
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{
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int i;
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u32 r;
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for (i = 0; i < 4; i++) {
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r = random32();
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memcpy(b + i * 4, &r, 4);
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}
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/* reversion 0b10 */
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b[8] = (b[8] & 0x3F) | 0x80;
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}
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void uuid_le_gen(uuid_le *lu)
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{
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__uuid_gen_common(lu->b);
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/* version 4 : random generation */
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lu->b[7] = (lu->b[7] & 0x0F) | 0x40;
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}
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EXPORT_SYMBOL_GPL(uuid_le_gen);
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void uuid_be_gen(uuid_be *bu)
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{
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__uuid_gen_common(bu->b);
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/* version 4 : random generation */
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bu->b[6] = (bu->b[6] & 0x0F) | 0x40;
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}
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EXPORT_SYMBOL_GPL(uuid_be_gen);
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