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
|
/* SPDX-License-Identifier: GPL-2.0
*
* (C) 2014 Karim Allah Ahmed <karim.allah.ahmed@gmail.com>
* (C) 2020, EPAM Systems Inc.
*/
#ifndef _ASM_ARM_XEN_SYSTEM_H
#define _ASM_ARM_XEN_SYSTEM_H
#include <compiler.h>
#include <asm/bitops.h>
/* If *ptr == old, then store new there (and return new).
* Otherwise, return the old value.
* Atomic.
*/
#define synch_cmpxchg(ptr, old, new) \
({ __typeof__(*ptr) stored = old; \
__atomic_compare_exchange_n(ptr, &stored, new, 0, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST) ? new : old; \
})
/* As test_and_clear_bit, but using __ATOMIC_SEQ_CST */
static inline int synch_test_and_clear_bit(int nr, volatile void *addr)
{
u8 *byte = ((u8 *)addr) + (nr >> 3);
u8 bit = 1 << (nr & 7);
u8 orig;
orig = __atomic_fetch_and(byte, ~bit, __ATOMIC_SEQ_CST);
return (orig & bit) != 0;
}
/* As test_and_set_bit, but using __ATOMIC_SEQ_CST */
static inline int synch_test_and_set_bit(int nr, volatile void *base)
{
u8 *byte = ((u8 *)base) + (nr >> 3);
u8 bit = 1 << (nr & 7);
u8 orig;
orig = __atomic_fetch_or(byte, bit, __ATOMIC_SEQ_CST);
return (orig & bit) != 0;
}
/* As set_bit, but using __ATOMIC_SEQ_CST */
static inline void synch_set_bit(int nr, volatile void *addr)
{
synch_test_and_set_bit(nr, addr);
}
/* As clear_bit, but using __ATOMIC_SEQ_CST */
static inline void synch_clear_bit(int nr, volatile void *addr)
{
synch_test_and_clear_bit(nr, addr);
}
/* As test_bit, but with a following memory barrier. */
//static inline int synch_test_bit(int nr, volatile void *addr)
static inline int synch_test_bit(int nr, const void *addr)
{
int result;
result = test_bit(nr, addr);
barrier();
return result;
}
#define xchg(ptr, v) __atomic_exchange_n(ptr, v, __ATOMIC_SEQ_CST)
#define xchg(ptr, v) __atomic_exchange_n(ptr, v, __ATOMIC_SEQ_CST)
#define xen_mb() mb()
#define xen_rmb() rmb()
#define xen_wmb() wmb()
#define to_phys(x) ((unsigned long)(x))
#define to_virt(x) ((void *)(x))
#define PFN_UP(x) (unsigned long)(((x) + PAGE_SIZE - 1) >> PAGE_SHIFT)
#define PFN_DOWN(x) (unsigned long)((x) >> PAGE_SHIFT)
#define PFN_PHYS(x) ((unsigned long)(x) << PAGE_SHIFT)
#define PHYS_PFN(x) (unsigned long)((x) >> PAGE_SHIFT)
#define virt_to_pfn(_virt) (PFN_DOWN(to_phys(_virt)))
#define virt_to_mfn(_virt) (PFN_DOWN(to_phys(_virt)))
#define mfn_to_virt(_mfn) (to_virt(PFN_PHYS(_mfn)))
#define pfn_to_virt(_pfn) (to_virt(PFN_PHYS(_pfn)))
#endif
|
