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
|
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2013 Google, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc.
*/
#include <string.h>
#include <stddef.h>
#include <console/console.h>
#include <cbmem.h>
#include <arch/early_variables.h>
#if IS_ENABLED(CONFIG_PLATFORM_USES_FSP1_0)
#include <drivers/intel/fsp1_0/fsp_util.h>
#endif
typedef void (* const car_migration_func_t)(void);
extern car_migration_func_t _car_migrate_start;
extern char _car_data_start[];
extern char _car_data_end[];
/*
* The car_migrated global variable determines if the cache-as-ram space has
* been migrated to real RAM. It does this by assuming the following things:
* 1. cache-as-ram space is zero'd out once it is set up.
* 2. Either the cache-as-ram space is memory-backed after getting torn down
* or the space returns 0xff's for each byte read.
* Based on these 2 attributes there is the ability to tell when the
* cache-as-ram region has been migrated.
*/
static int car_migrated CAR_GLOBAL;
/** @brief returns pointer to a CAR variable, before or after migration.
*
* @param var pointer to the CAR variable
*/
void *car_get_var_ptr(void *var)
{
char *migrated_base = NULL;
int offset;
void * _car_start = &_car_data_start;
void * _car_end = &_car_data_end;
/* If the cache-as-ram has not been migrated return the pointer
* passed in. */
if (!car_migrated)
return var;
if (var < _car_start || var >= _car_end) {
printk(BIOS_ERR,
"Requesting CAR variable outside of CAR region: %p\n",
var);
return var;
}
#if IS_ENABLED(CONFIG_PLATFORM_USES_FSP1_0)
migrated_base=(char *)find_saved_temp_mem(
*(void **)CBMEM_FSP_HOB_PTR);
#else
migrated_base = cbmem_find(CBMEM_ID_CAR_GLOBALS);
#endif
if (migrated_base == NULL)
die( "CAR: Could not find migration base!\n");
offset = (char *)var - (char *)_car_start;
return &migrated_base[offset];
}
/*
* Update a CAR_GLOBAL variable var, originally pointing to CAR region,
* with the address in migrated CAR region in DRAM.
*/
void *car_sync_var_ptr(void *var)
{
void ** mig_var = car_get_var_ptr(var);
void * _car_start = &_car_data_start;
void * _car_end = &_car_data_end;
/* Not moved or migrated yet. */
if (mig_var == var)
return mig_var;
/* It's already pointing outside car.global_data. */
if (*mig_var < _car_start || *mig_var > _car_end)
return mig_var;
#if !IS_ENABLED(CONFIG_PLATFORM_USES_FSP1_0)
/* Keep console buffer in CAR until cbmemc_reinit() moves it. */
if (*mig_var == _car_end)
return mig_var;
#endif
/* Move the pointer by the same amount the variable storing it was
* moved by.
*/
*mig_var += (char *)mig_var - (char *)var;
return mig_var;
}
static void do_car_migrate_variables(void)
{
void *migrated_base;
size_t car_data_size = &_car_data_end[0] - &_car_data_start[0];
/* Check if already migrated. */
if (car_migrated)
return;
migrated_base = cbmem_add(CBMEM_ID_CAR_GLOBALS, car_data_size);
if (migrated_base == NULL) {
printk(BIOS_ERR, "Could not migrate CAR data!\n");
return;
}
memcpy(migrated_base, &_car_data_start[0], car_data_size);
/* Mark that the data has been moved. */
car_migrated = ~0;
}
static void car_migrate_variables(void)
{
if (!IS_ENABLED(CONFIG_BROKEN_CAR_MIGRATE) && !IS_ENABLED(PLATFORM_USES_FSP1_0))
do_car_migrate_variables();
}
ROMSTAGE_CBMEM_INIT_HOOK(car_migrate_variables)
|
