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
|
/*
* This file is part of the libpayload project.
*
* Copyright (C) 2008 coresystems GmbH
*
* 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.
*/
#include <libpayload.h>
#include <assert.h>
#include <die.h>
#include <stdlib.h>
#include <unistd.h>
#include <arch/cache.h>
#include <arch/virtual.h>
#include <arch/io.h>
unsigned long virtual_offset = 0;
extern char _end[];
/*
* MAIR Index
* (Originally defined in src/arch/arm/include/armv7/arch/cache.h)
*/
#define MAIR_INDX_NC 0
#define MAIR_INDX_WT 1
#define MAIR_INDX_WB 2
/*
* Translation Table Attribute
* (Originally defined in src/arch/arm/include/armv7/arch/cache.h)
*/
#define ATTR_BASE (\
0ULL << 54 | /* PN. 0:Not restricted */ \
0ULL << 53 | /* PXN. 0:Not restricted */ \
1 << 10 | /* AF. 1:Accessed. This is to prevent access \
* fault when accessed for the first time */ \
0 << 6 | /* AP[2:1]. 0b00:full access from PL1 */ \
0 << 5 | /* NS. 0:Output address is in Secure space */ \
0 << 1 | /* block/table. 0:block entry */ \
1 << 0 /* validity. 1:valid */ \
)
#define ATTR_NC (ATTR_BASE | (MAIR_INDX_NC << 2))
#define ATTR_WT (ATTR_BASE | (MAIR_INDX_WT << 2))
#define ATTR_WB (ATTR_BASE | (MAIR_INDX_WB << 2))
/* Translation Table Entry */
typedef uint64_t pmd_t;
typedef uint64_t pgd_t;
#define SECTION_SHIFT 30
#define BLOCK_SHIFT 21
#define PAGE_SHIFT 12
#define PGD_MASK (~0 << PAGE_SHIFT)
static pmd_t *ttb_buff = 0;
static uintptr_t work_block;
static pmd_t original_map;
int getpagesize(void)
{
return 1 << PAGE_SHIFT;
}
static void lpae_map_init(void)
{
pgd_t *pgd;
die_if(!(read_ttbcr() >> 31), "LPAE is not enabled\n");
/* get work block address */
work_block = ALIGN_UP((uintptr_t)_end, 2*MiB);
assert(work_block);
printf("Work block for LPAE mapping is @ 0x%p\n", (void *)work_block);
/* get the address of the 1st pmd from pgd[0] */
pgd = (pgd_t *)((uintptr_t)read_ttbr0() & PGD_MASK);
ttb_buff = (pmd_t *)((uintptr_t)pgd[0] & PGD_MASK);
assert(ttb_buff);
original_map = ttb_buff[work_block >> BLOCK_SHIFT];
}
static void lpae_flush_work_block(void)
{
dccmvac((uintptr_t)&ttb_buff[work_block >> BLOCK_SHIFT]);
dsb();
tlbimvaa(work_block);
dsb();
isb();
}
/**
* Maps a 2MB designated block to a requested physical address, and returns
* the address to the block or NULL on error.
*
* pa_mb: Physical address in MB. Has to be on a 2MB boundary.
* policy: Data chache policy
*/
void *lpae_map_phys_addr(unsigned long pa_mb, enum dcache_policy policy)
{
pmd_t attr;
if (!ttb_buff)
lpae_map_init();
switch(policy) {
case DCACHE_OFF:
attr = ATTR_NC;
break;
case DCACHE_WRITEBACK:
attr = ATTR_WB;
break;
case DCACHE_WRITETHROUGH:
attr = ATTR_WT;
break;
default:
return NULL;
}
ttb_buff[work_block >> BLOCK_SHIFT] =
((pmd_t)pa_mb/2 << BLOCK_SHIFT) | attr;
lpae_flush_work_block();
return (void *)work_block;
}
void lpae_restore_map(void)
{
ttb_buff[work_block >> BLOCK_SHIFT] = original_map;
lpae_flush_work_block();
}
|
