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
|
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2014 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., 51 Franklin St, Fifth Floor, Boston,
* MA 02110-1301 USA
*
* secmon_loader.c: Responsible for loading the rmodule, providing entry point
* and parameter location for the rmodule.
*/
#include <arch/lib_helpers.h>
#include <arch/secmon.h>
#include <arch/spintable.h>
#include <arch/stages.h>
#include <console/console.h>
#include <rmodule.h>
#include <string.h>
/* SECMON entry point encoded as an rmodule */
extern unsigned char _binary_secmon_start[];
typedef void (*secmon_entry_t)(struct secmon_params *);
void __attribute__((weak)) soc_get_secmon_base_size(uint64_t *secmon_base, size_t *secmon_size)
{
/* Default weak implementation initializes to 0 */
*secmon_base = 0;
*secmon_size = 0;
}
static secmon_entry_t secmon_load_rmodule(void)
{
struct rmodule secmon_mod;
uint64_t secmon_base;
size_t secmon_size;
/* Get base address and size of the area available for secure monitor
* rmodule.
*/
soc_get_secmon_base_size(&secmon_base, &secmon_size);
if ((secmon_base == 0) || (secmon_size == 0)) {
printk(BIOS_ERR, "ARM64: secmon_base / secmon_size invalid\n");
return NULL;
}
printk(BIOS_DEBUG,"secmon_base:%lx,secmon_size:%lx\n",
(unsigned long)secmon_base, (unsigned long)secmon_size);
/* Fail if can't parse secmon module */
if (rmodule_parse(&_binary_secmon_start, &secmon_mod)) {
printk(BIOS_ERR, "ARM64: secmon_mod not found\n");
return NULL;
}
/* Load rmodule at secmon_base */
if (rmodule_load((void *)secmon_base, &secmon_mod)) {
printk(BIOS_ERR, "ARM64:secmon_mod cannot load\n");
return NULL;
}
/* Identify the entry point for secure monitor */
return rmodule_entry(&secmon_mod);
}
struct secmon_runit {
secmon_entry_t entry;
struct secmon_params bsp_params;
struct secmon_params secondary_params;
};
static void secmon_start(void *arg)
{
uint32_t scr;
secmon_entry_t entry;
struct secmon_params *p = NULL;
struct secmon_runit *r = arg;
entry = r->entry;
if (cpu_is_bsp())
p = &r->bsp_params;
else {
entry = secondary_entry_point(entry);
if (r->secondary_params.entry != NULL)
p = &r->secondary_params;
}
printk(BIOS_DEBUG, "CPU%x entering secure monitor %p.\n",
cpu_info()->id, entry);
/* We want to enforce the following policies:
* NS bit is set for lower EL
*/
scr = raw_read_scr_el3();
scr |= SCR_NS;
raw_write_scr_el3(scr);
entry(p);
}
void secmon_run(void (*entry)(void *), void *cb_tables)
{
const struct spintable_attributes *spin_attrs;
static struct secmon_runit runit;
struct cpu_action action = {
.run = secmon_start,
.arg = &runit,
};
printk(BIOS_SPEW, "payload jump @ %p\n", entry);
if (get_current_el() != EL3) {
printk(BIOS_DEBUG, "Secmon Error: Can only be loaded in EL3\n");
return;
}
runit.entry = secmon_load_rmodule();
if (runit.entry == NULL)
die("ARM64 Error: secmon load error");
printk(BIOS_DEBUG, "ARM64: Loaded the el3 monitor...jumping to %p\n",
runit.entry);
runit.bsp_params.entry = entry;
runit.bsp_params.arg = cb_tables;
runit.bsp_params.elx_el = EL2;
runit.bsp_params.elx_mode = SPSR_USE_L;
runit.secondary_params.elx_el = EL2;
runit.secondary_params.elx_mode = SPSR_USE_L;
spin_attrs = spintable_get_attributes();
if (spin_attrs != NULL) {
runit.secondary_params.entry = spin_attrs->entry;
runit.secondary_params.arg = spin_attrs->addr;
}
arch_run_on_all_cpus_but_self_async(&action);
secmon_start(&runit);
}
|
