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
|
/*
* This file is part of the coreboot project.
*
* Copyright 2014 Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* cache.c: Cache maintenance routines for ARMv8 (aarch64)
*
* Reference: ARM Architecture Reference Manual, ARMv8-A edition
*/
#include <stdint.h>
#include <arch/cache.h>
#include <arch/cache_helpers.h>
#include <arch/lib_helpers.h>
#include <program_loading.h>
void tlb_invalidate_all(void)
{
/* TLBIALL includes dTLB and iTLB on systems that have them. */
tlbiall_current();
dsb();
isb();
}
unsigned int dcache_line_bytes(void)
{
uint32_t ctr_el0;
static unsigned int line_bytes = 0;
if (line_bytes)
return line_bytes;
ctr_el0 = raw_read_ctr_el0();
/* [19:16] - Indicates (Log2(number of words in cache line) */
line_bytes = 1 << ((ctr_el0 >> 16) & 0xf);
/* Bytes in a word (32-bit) */
line_bytes *= sizeof(uint32_t);
return line_bytes;
}
enum dcache_op {
OP_DCCSW,
OP_DCCISW,
OP_DCISW,
OP_DCCIVAC,
OP_DCCVAC,
OP_DCIVAC,
};
/*
* Do a dcache operation by virtual address. This is useful for maintaining
* coherency in drivers which do DMA transfers and only need to perform
* cache maintenance on a particular memory range rather than the entire cache.
*/
static void dcache_op_va(void const *addr, size_t len, enum dcache_op op)
{
uint64_t line, linesize;
linesize = dcache_line_bytes();
line = (uint64_t)addr & ~(linesize - 1);
dsb();
while ((void *)line < addr + len) {
switch(op) {
case OP_DCCIVAC:
dccivac(line);
break;
case OP_DCCVAC:
dccvac(line);
break;
case OP_DCIVAC:
dcivac(line);
break;
default:
break;
}
line += linesize;
}
isb();
}
void dcache_clean_by_mva(void const *addr, size_t len)
{
dcache_op_va(addr, len, OP_DCCVAC);
}
void dcache_clean_invalidate_by_mva(void const *addr, size_t len)
{
dcache_op_va(addr, len, OP_DCCIVAC);
}
void dcache_invalidate_by_mva(void const *addr, size_t len)
{
dcache_op_va(addr, len, OP_DCIVAC);
}
/*
* CAUTION: This implementation assumes that coreboot never uses non-identity
* page tables for pages containing executed code. If you ever want to violate
* this assumption, have fun figuring out the associated problems on your own.
*/
void dcache_mmu_disable(void)
{
uint32_t sctlr;
flush_dcache_all(DCCISW);
sctlr = raw_read_sctlr_current();
sctlr &= ~(SCTLR_C | SCTLR_M);
raw_write_sctlr_current(sctlr);
}
void dcache_mmu_enable(void)
{
uint32_t sctlr;
sctlr = raw_read_sctlr_current();
sctlr |= SCTLR_C | SCTLR_M;
raw_write_sctlr_current(sctlr);
}
void cache_sync_instructions(void)
{
flush_dcache_all(DCCISW); /* includes trailing DSB (in assembly) */
icache_invalidate_all(); /* includdes leading DSB and trailing ISB. */
}
/*
* For each segment of a program loaded this function is called
* to invalidate caches for the addresses of the loaded segment
*/
void arch_segment_loaded(uintptr_t start, size_t size, int flags)
{
dcache_clean_invalidate_by_mva((void *)start, size);
icache_invalidate_all();
}
|
