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
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
/*
* include/asm-arm/macro.h
*
* Copyright (C) 2009 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __ASM_ARM_MACRO_H__
#define __ASM_ARM_MACRO_H__
#ifdef __ASSEMBLY__
/*
* These macros provide a convenient way to write 8, 16 and 32 bit data
* to any address.
* Registers r4 and r5 are used, any data in these registers are
* overwritten by the macros.
* The macros are valid for any ARM architecture, they do not implement
* any memory barriers so caution is recommended when using these when the
* caches are enabled or on a multi-core system.
*/
.macro write32, addr, data
ldr r4, =\addr
ldr r5, =\data
str r5, [r4]
.endm
.macro write16, addr, data
ldr r4, =\addr
ldrh r5, =\data
strh r5, [r4]
.endm
.macro write8, addr, data
ldr r4, =\addr
ldrb r5, =\data
strb r5, [r4]
.endm
/*
* This macro generates a loop that can be used for delays in the code.
* Register r4 is used, any data in this register is overwritten by the
* macro.
* The macro is valid for any ARM architeture. The actual time spent in the
* loop will vary from CPU to CPU though.
*/
.macro wait_timer, time
ldr r4, =\time
1:
nop
subs r4, r4, #1
bcs 1b
.endm
#ifdef CONFIG_ARM64
/*
* Register aliases.
*/
lr .req x30
/*
* Branch according to exception level
*/
.macro switch_el, xreg, el3_label, el2_label, el1_label
mrs \xreg, CurrentEL
cmp \xreg, 0xc
b.eq \el3_label
cmp \xreg, 0x8
b.eq \el2_label
cmp \xreg, 0x4
b.eq \el1_label
.endm
/*
* Branch if current processor is a slave,
* choose processor with all zero affinity value as the master.
*/
.macro branch_if_slave, xreg, slave_label
mrs \xreg, mpidr_el1
tst \xreg, #0xff /* Test Affinity 0 */
b.ne \slave_label
lsr \xreg, \xreg, #8
tst \xreg, #0xff /* Test Affinity 1 */
b.ne \slave_label
lsr \xreg, \xreg, #8
tst \xreg, #0xff /* Test Affinity 2 */
b.ne \slave_label
lsr \xreg, \xreg, #16
tst \xreg, #0xff /* Test Affinity 3 */
b.ne \slave_label
.endm
/*
* Branch if current processor is a master,
* choose processor with all zero affinity value as the master.
*/
.macro branch_if_master, xreg1, xreg2, master_label
mrs \xreg1, mpidr_el1
lsr \xreg2, \xreg1, #32
lsl \xreg1, \xreg1, #40
lsr \xreg1, \xreg1, #40
orr \xreg1, \xreg1, \xreg2
cbz \xreg1, \master_label
.endm
.macro armv8_switch_to_el2_m, xreg1
/* 64bit EL2 | HCE | SMD | RES1 (Bits[5:4]) | Non-secure EL0/EL1 */
mov \xreg1, #0x5b1
msr scr_el3, \xreg1
msr cptr_el3, xzr /* Disable coprocessor traps to EL3 */
mov \xreg1, #0x33ff
msr cptr_el2, \xreg1 /* Disable coprocessor traps to EL2 */
/* Initialize SCTLR_EL2
*
* setting RES1 bits (29,28,23,22,18,16,11,5,4) to 1
* and RES0 bits (31,30,27,26,24,21,20,17,15-13,10-6) +
* EE,WXN,I,SA,C,A,M to 0
*/
mov \xreg1, #0x0830
movk \xreg1, #0x30C5, lsl #16
msr sctlr_el2, \xreg1
/* Return to the EL2_SP2 mode from EL3 */
mov \xreg1, sp
msr sp_el2, \xreg1 /* Migrate SP */
mrs \xreg1, vbar_el3
msr vbar_el2, \xreg1 /* Migrate VBAR */
mov \xreg1, #0x3c9
msr spsr_el3, \xreg1 /* EL2_SP2 | D | A | I | F */
msr elr_el3, lr
eret
.endm
.macro armv8_switch_to_el1_m, xreg1, xreg2
/* Initialize Generic Timers */
mrs \xreg1, cnthctl_el2
orr \xreg1, \xreg1, #0x3 /* Enable EL1 access to timers */
msr cnthctl_el2, \xreg1
msr cntvoff_el2, xzr
/* Initilize MPID/MPIDR registers */
mrs \xreg1, midr_el1
mrs \xreg2, mpidr_el1
msr vpidr_el2, \xreg1
msr vmpidr_el2, \xreg2
/* Disable coprocessor traps */
mov \xreg1, #0x33ff
msr cptr_el2, \xreg1 /* Disable coprocessor traps to EL2 */
msr hstr_el2, xzr /* Disable coprocessor traps to EL2 */
mov \xreg1, #3 << 20
msr cpacr_el1, \xreg1 /* Enable FP/SIMD at EL1 */
/* Initialize HCR_EL2 */
mov \xreg1, #(1 << 31) /* 64bit EL1 */
orr \xreg1, \xreg1, #(1 << 29) /* Disable HVC */
msr hcr_el2, \xreg1
/* SCTLR_EL1 initialization
*
* setting RES1 bits (29,28,23,22,20,11) to 1
* and RES0 bits (31,30,27,21,17,13,10,6) +
* UCI,EE,EOE,WXN,nTWE,nTWI,UCT,DZE,I,UMA,SED,ITD,
* CP15BEN,SA0,SA,C,A,M to 0
*/
mov \xreg1, #0x0800
movk \xreg1, #0x30d0, lsl #16
msr sctlr_el1, \xreg1
/* Return to the EL1_SP1 mode from EL2 */
mov \xreg1, sp
msr sp_el1, \xreg1 /* Migrate SP */
mrs \xreg1, vbar_el2
msr vbar_el1, \xreg1 /* Migrate VBAR */
mov \xreg1, #0x3c5
msr spsr_el2, \xreg1 /* EL1_SP1 | D | A | I | F */
msr elr_el2, lr
eret
.endm
#if defined(CONFIG_GICV3)
.macro gic_wait_for_interrupt_m xreg1
0 : wfi
mrs \xreg1, ICC_IAR1_EL1
msr ICC_EOIR1_EL1, \xreg1
cbnz \xreg1, 0b
.endm
#elif defined(CONFIG_GICV2)
.macro gic_wait_for_interrupt_m xreg1, wreg2
0 : wfi
ldr \wreg2, [\xreg1, GICC_AIAR]
str \wreg2, [\xreg1, GICC_AEOIR]
and \wreg2, \wreg2, #3ff
cbnz \wreg2, 0b
.endm
#endif
#endif /* CONFIG_ARM64 */
#endif /* __ASSEMBLY__ */
#endif /* __ASM_ARM_MACRO_H__ */
|
