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
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
/*
* This file is part of the coreboot project.
*
* Copyright 2017 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.
*/
#include <arch/io.h>
#include <bootstate.h>
#include <commonlib/region.h>
#include <console/console.h>
#include <fmap.h>
#include <intelblocks/cse.h>
#include <soc/pci_devs.h>
#include <device/pci_ops.h>
#include <stdint.h>
#define PCI_ME_HFSTS1 0x40
#define PCI_ME_HFSTS2 0x48
#define PCI_ME_HFSTS3 0x60
#define PCI_ME_HFSTS4 0x64
#define PCI_ME_HFSTS5 0x68
#define PCI_ME_HFSTS6 0x6c
#define MKHI_GROUP_ID_MCA 0x0a
#define READ_FILE 0x02
#define READ_FILE_FLAG_DEFAULT (1 << 0)
#define READ_FILE_FLAG_HASH (1 << 1)
#define READ_FILE_FLAG_EMULATED (1 << 2)
#define READ_FILE_FLAG_HW (1 << 3)
#define MCA_MAX_FILE_PATH_SIZE 64
#define FUSE_LOCK_FILE "/fpf/intel/SocCfgLock"
/* Status values are made in such a way erase is not needed */
static enum fuse_flash_state {
FUSE_FLASH_FUSED = 0xfc,
FUSE_FLASH_UNFUSED = 0xfe,
FUSE_FLASH_UNKNOWN = 0xff,
} g_fuse_state;
#define FPF_STATUS_FMAP "FPF_STATUS"
/*
* Read file from CSE internal filesystem.
* size is maximum length of provided buffer buff, which is updated with actual
* size of the file read. flags indicate whether real file or fuse is used.
* Returns 1 on success and 0 otherwise.
*/
static int read_cse_file(const char *path, void *buff, size_t *size,
size_t offset, uint32_t flags)
{
int res;
size_t reply_size;
union mkhi_header {
uint32_t data;
struct {
uint32_t group_id: 8;
uint32_t command: 7;
uint32_t is_response: 1;
uint32_t reserved: 8;
uint32_t result: 8;
} __packed fields;
};
struct mca_command {
union mkhi_header mkhi_hdr;
char file_name[MCA_MAX_FILE_PATH_SIZE];
uint32_t offset;
uint32_t data_size;
uint8_t flags;
} __packed msg;
struct mca_response {
union mkhi_header mkhi_hdr;
uint32_t data_size;
uint8_t buffer[128];
} __packed rmsg;
if (sizeof(rmsg.buffer) < *size) {
printk(BIOS_ERR, "internal buffer is too small\n");
return 0;
}
if (strnlen(path, sizeof(msg.file_name)) >= sizeof(msg.file_name)) {
printk(BIOS_ERR, "path too big for msg.file_name buffer\n");
return 0;
}
strncpy(msg.file_name, path, sizeof(msg.file_name));
msg.mkhi_hdr.fields.group_id = MKHI_GROUP_ID_MCA;
msg.mkhi_hdr.fields.command = READ_FILE;
msg.flags = flags;
msg.data_size = *size;
msg.offset = offset;
res = heci_send(&msg, sizeof(msg), BIOS_HOST_ADDR, HECI_MKHI_ADDR);
if (!res) {
printk(BIOS_ERR, "failed to send HECI message\n");
return 0;
}
reply_size = sizeof(rmsg);
res = heci_receive(&rmsg, &reply_size);
if (!res) {
printk(BIOS_ERR, "failed to receive HECI reply\n");
return 0;
}
if (rmsg.data_size > *size) {
printk(BIOS_ERR, "reply is too large\n");
return 0;
}
memcpy(buff, rmsg.buffer, rmsg.data_size);
*size = rmsg.data_size;
return 1;
}
static enum fuse_flash_state load_cached_fpf(struct region_device *rdev)
{
enum fuse_flash_state state;
uint8_t buff;
state = FUSE_FLASH_UNKNOWN;
if (rdev_readat(rdev, &buff, 0, sizeof(buff)) >= 0) {
state = read8(&buff);
return state;
}
printk(BIOS_WARNING, "failed to load cached FPF value\n");
return state;
}
static
int save_fpf_state(enum fuse_flash_state state, struct region_device *rdev)
{
uint8_t buff;
write8(&buff, (uint8_t) state);
return rdev_writeat(rdev, &buff, 0, sizeof(buff));
}
static void fpf_blown(void *unused)
{
uint8_t fuse;
struct region_device rdev;
size_t sz = sizeof(fuse);
bool rdev_valid = false;
if (fmap_locate_area_as_rdev_rw(FPF_STATUS_FMAP, &rdev) == 0) {
rdev_valid = true;
g_fuse_state = load_cached_fpf(&rdev);
if (g_fuse_state != FUSE_FLASH_UNKNOWN)
return;
}
if (!read_cse_file(FUSE_LOCK_FILE, &fuse, &sz, 0, READ_FILE_FLAG_HW))
return;
g_fuse_state = fuse == 1 ? FUSE_FLASH_FUSED : FUSE_FLASH_UNFUSED;
if (rdev_valid && (save_fpf_state(g_fuse_state, &rdev) < 0))
printk(BIOS_CRIT, "failed to save FPF state\n");
}
static uint32_t dump_status(int index, int reg_addr)
{
uint32_t reg = pci_read_config32(PCH_DEV_CSE, reg_addr);
printk(BIOS_DEBUG, "CSE FWSTS%d: 0x%08x\n", index, reg);
return reg;
}
static void dump_cse_state(void *unused)
{
uint32_t fwsts1;
fwsts1 = dump_status(1, PCI_ME_HFSTS1);
dump_status(2, PCI_ME_HFSTS2);
dump_status(3, PCI_ME_HFSTS3);
dump_status(4, PCI_ME_HFSTS4);
dump_status(5, PCI_ME_HFSTS5);
dump_status(6, PCI_ME_HFSTS6);
/* Minimal decoding is done here in order to call out most important
pieces. Manufacturing mode needs to be locked down prior to shipping
the product so it's called out explicitly. */
printk(BIOS_DEBUG, "ME: Manufacturing Mode : %s\n",
(fwsts1 & (1 << 0x4)) ? "YES" : "NO");
printk(BIOS_DEBUG, "ME: FPF status : ");
switch (g_fuse_state) {
case FUSE_FLASH_UNFUSED:
printk(BIOS_DEBUG, "unfused");
break;
case FUSE_FLASH_FUSED:
printk(BIOS_DEBUG, "fused");
break;
default:
case FUSE_FLASH_UNKNOWN:
printk(BIOS_DEBUG, "unknown");
}
printk(BIOS_DEBUG, "\n");
}
BOOT_STATE_INIT_ENTRY(BS_DEV_INIT, BS_ON_ENTRY, fpf_blown, NULL);
BOOT_STATE_INIT_ENTRY(BS_OS_RESUME, BS_ON_ENTRY, dump_cse_state, NULL);
BOOT_STATE_INIT_ENTRY(BS_PAYLOAD_LOAD, BS_ON_EXIT, dump_cse_state, NULL);
|
