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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>
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/* | ||
* UUID/GUID definition | ||
* | ||
* Copyright (C) 2010, 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 | ||
*/ | ||
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#ifndef _LINUX_UUID_H_ | ||
#define _LINUX_UUID_H_ | ||
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#include <linux/types.h> | ||
#include <linux/string.h> | ||
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typedef struct { | ||
__u8 b[16]; | ||
} uuid_le; | ||
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typedef struct { | ||
__u8 b[16]; | ||
} uuid_be; | ||
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#define UUID_LE(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7) \ | ||
((uuid_le) \ | ||
{{ (a) & 0xff, ((a) >> 8) & 0xff, ((a) >> 16) & 0xff, ((a) >> 24) & 0xff, \ | ||
(b) & 0xff, ((b) >> 8) & 0xff, \ | ||
(c) & 0xff, ((c) >> 8) & 0xff, \ | ||
(d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }}) | ||
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#define UUID_BE(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7) \ | ||
((uuid_be) \ | ||
{{ ((a) >> 24) & 0xff, ((a) >> 16) & 0xff, ((a) >> 8) & 0xff, (a) & 0xff, \ | ||
((b) >> 8) & 0xff, (b) & 0xff, \ | ||
((c) >> 8) & 0xff, (c) & 0xff, \ | ||
(d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }}) | ||
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#define NULL_UUID_LE \ | ||
UUID_LE(0x00000000, 0x0000, 0x0000, 0x00, 0x00, 0x00, 0x00, \ | ||
0x00, 0x00, 0x00, 0x00) | ||
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#define NULL_UUID_BE \ | ||
UUID_BE(0x00000000, 0x0000, 0x0000, 0x00, 0x00, 0x00, 0x00, \ | ||
0x00, 0x00, 0x00, 0x00) | ||
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static inline int uuid_le_cmp(const uuid_le u1, const uuid_le u2) | ||
{ | ||
return memcmp(&u1, &u2, sizeof(uuid_le)); | ||
} | ||
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static inline int uuid_be_cmp(const uuid_be u1, const uuid_be u2) | ||
{ | ||
return memcmp(&u1, &u2, sizeof(uuid_be)); | ||
} | ||
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extern void uuid_le_gen(uuid_le *u); | ||
extern void uuid_be_gen(uuid_be *u); | ||
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#endif |
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Original file line number | Diff line number | Diff line change |
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/* | ||
* 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 | ||
*/ | ||
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#include <linux/kernel.h> | ||
#include <linux/module.h> | ||
#include <linux/uuid.h> | ||
#include <linux/random.h> | ||
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static void __uuid_gen_common(__u8 b[16]) | ||
{ | ||
int i; | ||
u32 r; | ||
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for (i = 0; i < 4; i++) { | ||
r = random32(); | ||
memcpy(b + i * 4, &r, 4); | ||
} | ||
/* reversion 0b10 */ | ||
b[8] = (b[8] & 0x3F) | 0x80; | ||
} | ||
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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); | ||
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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); |