1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
/*
* Copyright (c) 2017 Richard Braun.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef _ARM_CPU_ARMV7_H
#define _ARM_CPU_ARMV7_H
#if CONFIG_ARM_ARCH >= 7
#ifndef __ASSEMBLER__
#include <stdint.h>
#include <kern/macros.h>
/*
* Get the value of the TPIDRPRW register.
*/
static inline uintptr_t
cpu_get_tpidrprw(void)
{
uintptr_t value;
asm("mrc p15, 0, %0, c13, c0, 4" : "=r" (value));
return value;
}
/*
* Set the value of the TPIDRPRW register.
*
* Implies a compiler barrier.
*/
static inline void
cpu_set_tpidrprw(uintptr_t value)
{
asm volatile("mcr p15, 0, %0, c13, c0, 4" : : "r" (value) : "memory");
}
/* TODO Rework into common code */
#define cpu_local_ptr(var) \
MACRO_BEGIN \
uintptr_t ___percpu_area; \
uintptr_t ___offset; \
typeof(var) *___ptr; \
\
___percpu_area = cpu_get_tpidrprw(); \
___offset = (uintptr_t)(&(var)); \
___ptr = (typeof(var) *)(___percpu_area + ___offset); \
___ptr; \
MACRO_END
/* TODO Rework into common code */
#define cpu_local_var(var) (*cpu_local_ptr(var))
/* Interrupt-safe percpu accessors for basic types */
/* TODO Rework into common code */
#define cpu_local_assign(var, val) \
MACRO_BEGIN \
unsigned long ___flags; \
\
cpu_intr_save(&___flags); \
cpu_local_var(var) = val; \
cpu_intr_restore(___flags); \
MACRO_END
/* TODO Rework into common code */
#define cpu_local_read(var) \
MACRO_BEGIN \
unsigned long ___flags; \
typeof(var) ___val; \
\
cpu_intr_save(&___flags); \
___val = cpu_local_var(var); \
cpu_intr_restore(___flags); \
\
___val; \
MACRO_END
#endif /* __ASSEMBLER__ */
#endif /* ARM_ARCH >= 7 */
#endif /* _ARM_CPU_ARMV7_H */
|
