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
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
#
# Copyright (c) 2014-2018, Linaro Limited. All rights reserved.
#
# SPDX-License-Identifier: BSD-2-Clause-Patent
#
#
.text
.align 3
GCC_ASM_EXPORT(MmioRead8Internal)
GCC_ASM_EXPORT(MmioWrite8Internal)
GCC_ASM_EXPORT(MmioRead16Internal)
GCC_ASM_EXPORT(MmioWrite16Internal)
GCC_ASM_EXPORT(MmioRead32Internal)
GCC_ASM_EXPORT(MmioWrite32Internal)
GCC_ASM_EXPORT(MmioRead64Internal)
GCC_ASM_EXPORT(MmioWrite64Internal)
//
// Reads an 8-bit MMIO register.
//
// Reads the 8-bit MMIO register specified by Address. The 8-bit read value is
// returned. This function must guarantee that all MMIO read and write
// operations are serialized.
//
// @param Address The MMIO register to read.
//
// @return The value read.
//
ASM_PFX(MmioRead8Internal):
AARCH64_BTI(c)
ldrb w0, [x0]
dmb ld
ret
//
// Writes an 8-bit MMIO register.
//
// Writes the 8-bit MMIO register specified by Address with the value specified
// by Value and returns Value. This function must guarantee that all MMIO read
// and write operations are serialized.
//
// @param Address The MMIO register to write.
// @param Value The value to write to the MMIO register.
//
ASM_PFX(MmioWrite8Internal):
AARCH64_BTI(c)
dmb st
strb w1, [x0]
ret
//
// Reads a 16-bit MMIO register.
//
// Reads the 16-bit MMIO register specified by Address. The 16-bit read value is
// returned. This function must guarantee that all MMIO read and write
// operations are serialized.
//
// @param Address The MMIO register to read.
//
// @return The value read.
//
ASM_PFX(MmioRead16Internal):
AARCH64_BTI(c)
ldrh w0, [x0]
dmb ld
ret
//
// Writes a 16-bit MMIO register.
//
// Writes the 16-bit MMIO register specified by Address with the value specified
// by Value and returns Value. This function must guarantee that all MMIO read
// and write operations are serialized.
//
// @param Address The MMIO register to write.
// @param Value The value to write to the MMIO register.
//
ASM_PFX(MmioWrite16Internal):
AARCH64_BTI(c)
dmb st
strh w1, [x0]
ret
//
// Reads a 32-bit MMIO register.
//
// Reads the 32-bit MMIO register specified by Address. The 32-bit read value is
// returned. This function must guarantee that all MMIO read and write
// operations are serialized.
//
// @param Address The MMIO register to read.
//
// @return The value read.
//
ASM_PFX(MmioRead32Internal):
AARCH64_BTI(c)
ldr w0, [x0]
dmb ld
ret
//
// Writes a 32-bit MMIO register.
//
// Writes the 32-bit MMIO register specified by Address with the value specified
// by Value and returns Value. This function must guarantee that all MMIO read
// and write operations are serialized.
//
// @param Address The MMIO register to write.
// @param Value The value to write to the MMIO register.
//
ASM_PFX(MmioWrite32Internal):
AARCH64_BTI(c)
dmb st
str w1, [x0]
ret
//
// Reads a 64-bit MMIO register.
//
// Reads the 64-bit MMIO register specified by Address. The 64-bit read value is
// returned. This function must guarantee that all MMIO read and write
// operations are serialized.
//
// @param Address The MMIO register to read.
//
// @return The value read.
//
ASM_PFX(MmioRead64Internal):
AARCH64_BTI(c)
ldr x0, [x0]
dmb ld
ret
//
// Writes a 64-bit MMIO register.
//
// Writes the 64-bit MMIO register specified by Address with the value specified
// by Value and returns Value. This function must guarantee that all MMIO read
// and write operations are serialized.
//
// @param Address The MMIO register to write.
// @param Value The value to write to the MMIO register.
//
ASM_PFX(MmioWrite64Internal):
AARCH64_BTI(c)
dmb st
str x1, [x0]
ret
|
