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
|
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2011 The ChromiumOS Authors. All rights reserved.
*
* 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
*/
#include <console/console.h>
#include <cbmem.h>
#include <cpu/x86/car.h>
#include <string.h>
/*
* Structure describing console buffer. It is overlaid on a flat memory area,
* with buffer_body covering the extent of the memory. Once the buffer is
* full, the cursor keeps going but the data is dropped on the floor. This
* allows to tell how much data was lost in the process.
*/
struct cbmem_console {
u32 buffer_size;
u32 buffer_cursor;
u8 buffer_body[0];
} __attribute__ ((__packed__));
static struct cbmem_console *cbmem_console_p CAR_GLOBAL;
#ifdef __PRE_RAM__
/*
* While running from ROM, before DRAM is initialized, some area in cache as
* ram space is used for the console buffer storage. The size and location of
* the area are defined in the config.
*/
static struct cbmem_console car_cbmem_console CAR_CBMEM;
#else
/*
* When running from RAM, a lot of console output is generated before CBMEM is
* reinitialized. This static buffer is used to store that output temporarily,
* to be concatenated with the CBMEM console buffer contents accumulated
* during the ROM stage, once CBMEM becomes available at RAM stage.
*/
static u8 static_console[40000];
#endif
static inline struct cbmem_console *current_console(void)
{
return car_get_var(cbmem_console_p);
}
static inline void current_console_set(struct cbmem_console *new_console_p)
{
car_set_var(cbmem_console_p, new_console_p);
}
static inline void init_console_ptr(void *storage, u32 total_space)
{
struct cbmem_console *cbm_cons_p = storage;
/* Initialize the cache-as-ram pointer and underlying structure. */
car_set_var(cbmem_console_p, cbm_cons_p);
cbm_cons_p->buffer_size = total_space - sizeof(struct cbmem_console);
cbm_cons_p->buffer_cursor = 0;
}
void cbmemc_init(void)
{
#ifdef __PRE_RAM__
init_console_ptr(&car_cbmem_console, CONFIG_CONSOLE_CAR_BUFFER_SIZE);
#else
/*
* Initializing before CBMEM is available, use static buffer to store
* the log.
*/
init_console_ptr(static_console, sizeof(static_console));
#endif
}
void cbmemc_tx_byte(unsigned char data)
{
struct cbmem_console *cbm_cons_p = current_console();
u32 cursor;
if (!cbm_cons_p)
return;
cursor = cbm_cons_p->buffer_cursor++;
if (cursor < cbm_cons_p->buffer_size)
cbm_cons_p->buffer_body[cursor] = data;
}
/*
* Copy the current console buffer (either from the cache as RAM area, or from
* the static buffer, pointed at by cbmem_console_p) into the CBMEM console
* buffer space (pointed at by new_cons_p), concatenating the copied data with
* the CBMEM console buffer contents.
*
* If there is overflow - add to the destination area a string, reporting the
* overflow and the number of dropped characters.
*/
static void copy_console_buffer(struct cbmem_console *new_cons_p)
{
u32 copy_size;
u32 cursor = new_cons_p->buffer_cursor;
struct cbmem_console *old_cons_p;
int overflow;
old_cons_p = current_console();
overflow = old_cons_p->buffer_cursor > old_cons_p->buffer_size;
copy_size = overflow ?
old_cons_p->buffer_size : old_cons_p->buffer_cursor;
memcpy(new_cons_p->buffer_body + cursor, old_cons_p->buffer_body,
copy_size);
cursor += copy_size;
if (overflow) {
const char loss_str1[] = "\n\n*** Log truncated, ";
const char loss_str2[] = " characters dropped. ***\n\n";
u32 dropped_chars = old_cons_p->buffer_cursor - copy_size;
/*
* When running from ROM sprintf is not available, a simple
* itoa implementation is used instead.
*/
int got_first_digit = 0;
/* Way more than possible number of dropped characters. */
u32 mult = 100000;
strcpy((char *)new_cons_p->buffer_body + cursor, loss_str1);
cursor += sizeof(loss_str1) - 1;
while (mult) {
int digit = dropped_chars / mult;
if (got_first_digit || digit) {
new_cons_p->buffer_body[cursor++] = digit + '0';
dropped_chars %= mult;
/* Excessive, but keeps it simple */
got_first_digit = 1;
}
mult /= 10;
}
strcpy((char *)new_cons_p->buffer_body + cursor, loss_str2);
cursor += sizeof(loss_str2) - 1;
}
new_cons_p->buffer_cursor = cursor;
}
void cbmemc_reinit(void)
{
struct cbmem_console *cbm_cons_p = NULL;
#ifndef __PRE_RAM__
cbm_cons_p = cbmem_find(CBMEM_ID_CONSOLE);
#endif
if (!cbm_cons_p) {
cbm_cons_p = cbmem_add(CBMEM_ID_CONSOLE,
CONFIG_CONSOLE_CBMEM_BUFFER_SIZE);
if (!cbm_cons_p) {
current_console_set(NULL);
return;
}
cbm_cons_p->buffer_size = CONFIG_CONSOLE_CBMEM_BUFFER_SIZE -
sizeof(struct cbmem_console);
cbm_cons_p->buffer_cursor = 0;
}
copy_console_buffer(cbm_cons_p);
current_console_set(cbm_cons_p);
}
/* Call cbmemc_reinit() at CAR migration time. */
CAR_MIGRATE(cbmemc_reinit)
|
