summaryrefslogtreecommitdiffstats
path: root/firmware/system.c
blob: ada99e0b5672cbc0f80a6037b592ed95490f3f24 (plain)
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
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2002 by Alan Korr
 *
 * 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; either version 2
 * of the License, or (at your option) any later version.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/
#include <stdio.h>
#include "config.h"
#include <stdbool.h>
#include "lcd.h"
#include "font.h"
#include "system.h"
#include "kernel.h"
#include "thread.h"
#include "timer.h"
#include "inttypes.h"
#include "string.h"

#ifndef SIMULATOR
long cpu_frequency SHAREDBSS_ATTR = CPU_FREQ;
#endif

#ifdef HAVE_ADJUSTABLE_CPU_FREQ
static int boost_counter SHAREDBSS_ATTR = 0;
static bool cpu_idle SHAREDBSS_ATTR = false;
#if NUM_CORES > 1
struct spinlock boostctrl_spin SHAREDBSS_ATTR;
void cpu_boost_init(void)
{
    spinlock_init(&boostctrl_spin);
}
#endif

int get_cpu_boost_counter(void)
{
    return boost_counter;
}
#ifdef CPU_BOOST_LOGGING
#define MAX_BOOST_LOG 64
static char cpu_boost_calls[MAX_BOOST_LOG][MAX_PATH];
static int cpu_boost_first = 0;
static int cpu_boost_calls_count = 0;
static int cpu_boost_track_message = 0;
int cpu_boost_log_getcount(void)
{
    return cpu_boost_calls_count;
}
char * cpu_boost_log_getlog_first(void)
{
    char *first;
#if NUM_CORES > 1
    spinlock_lock(&boostctrl_spin);
#endif

    first = NULL;

    if (cpu_boost_calls_count)
    {
        cpu_boost_track_message = 1;
        first = cpu_boost_calls[cpu_boost_first];
    }

#if NUM_CORES > 1
    spinlock_unlock(&boostctrl_spin);
#endif
    
    return first;
}

char * cpu_boost_log_getlog_next(void)
{
    int message;
    char *next;

#if NUM_CORES > 1
    spinlock_lock(&boostctrl_spin);
#endif

    message = (cpu_boost_track_message+cpu_boost_first)%MAX_BOOST_LOG;
    next = NULL;

    if (cpu_boost_track_message < cpu_boost_calls_count)
    {
        cpu_boost_track_message++;
        next = cpu_boost_calls[message];
    }

#if NUM_CORES > 1
    spinlock_unlock(&boostctrl_spin);
#endif
    
    return next;
}

void cpu_boost_(bool on_off, char* location, int line)
{
#if NUM_CORES > 1
    spinlock_lock(&boostctrl_spin);
#endif

    if (cpu_boost_calls_count == MAX_BOOST_LOG)
    {
        cpu_boost_first = (cpu_boost_first+1)%MAX_BOOST_LOG;
        cpu_boost_calls_count--;
        if (cpu_boost_calls_count < 0)
            cpu_boost_calls_count = 0;
    }
    if (cpu_boost_calls_count < MAX_BOOST_LOG)
    {
        int message = (cpu_boost_first+cpu_boost_calls_count)%MAX_BOOST_LOG;
        snprintf(cpu_boost_calls[message], MAX_PATH,
                    "%c %s:%d",on_off==true?'B':'U',location,line);
        cpu_boost_calls_count++;
    }
#else
void cpu_boost(bool on_off)
{
#if NUM_CORES > 1
    spinlock_lock(&boostctrl_spin);
#endif

#endif /* CPU_BOOST_LOGGING */
    if(on_off)
    {
        /* Boost the frequency if not already boosted */
        if(++boost_counter == 1)
            set_cpu_frequency(CPUFREQ_MAX);
    }
    else
    {
        /* Lower the frequency if the counter reaches 0 */
        if(--boost_counter <= 0)
        {
            if(cpu_idle)
                set_cpu_frequency(CPUFREQ_DEFAULT);
            else
                set_cpu_frequency(CPUFREQ_NORMAL);

            /* Safety measure */
            if (boost_counter < 0)
            {
                boost_counter = 0;
            }
        }
    }

#if NUM_CORES > 1
    spinlock_unlock(&boostctrl_spin);
#endif
}

void cpu_idle_mode(bool on_off)
{
#if NUM_CORES > 1
    spinlock_lock(&boostctrl_spin);
#endif

    cpu_idle = on_off;

    /* We need to adjust the frequency immediately if the CPU
       isn't boosted */
    if(boost_counter == 0)
    {
        if(cpu_idle)
            set_cpu_frequency(CPUFREQ_DEFAULT);
        else
            set_cpu_frequency(CPUFREQ_NORMAL);
    }

#if NUM_CORES > 1
    spinlock_unlock(&boostctrl_spin);
#endif
}
#endif /* HAVE_ADJUSTABLE_CPU_FREQ */


#ifdef HAVE_FLASHED_ROCKBOX
static bool detect_flash_header(uint8_t *addr)
{
#ifndef BOOTLOADER
    int oldmode = system_memory_guard(MEMGUARD_NONE);
#endif
    struct flash_header hdr;
    memcpy(&hdr, addr, sizeof(struct flash_header));
#ifndef BOOTLOADER
    system_memory_guard(oldmode);
#endif
    return hdr.magic == FLASH_MAGIC;
}
#endif

bool detect_flashed_romimage(void)
{
#ifdef HAVE_FLASHED_ROCKBOX
    return detect_flash_header((uint8_t *)FLASH_ROMIMAGE_ENTRY);
#else
    return false;
#endif /* HAVE_FLASHED_ROCKBOX */
}

bool detect_flashed_ramimage(void)
{
#ifdef HAVE_FLASHED_ROCKBOX
    return detect_flash_header((uint8_t *)FLASH_RAMIMAGE_ENTRY);
#else
    return false;
#endif /* HAVE_FLASHED_ROCKBOX */
}

bool detect_original_firmware(void)
{
    return !(detect_flashed_ramimage() || detect_flashed_romimage());
}

#if defined(CPU_ARM)

static const char* const uiename[] = {
    "Undefined instruction",
    "Prefetch abort",
    "Data abort",
    "Divide by zero"
};

/* Unexpected Interrupt or Exception handler. Currently only deals with
   exceptions, but will deal with interrupts later.
 */
void UIE(unsigned int pc, unsigned int num) __attribute__((noreturn));
void UIE(unsigned int pc, unsigned int num)
{
    char str[32];

    lcd_clear_display();
#ifdef HAVE_LCD_BITMAP
    lcd_setfont(FONT_SYSFIXED);
#endif
    lcd_puts(0, 0, uiename[num]);
    snprintf(str, sizeof(str), "at %08x" IF_COP(" (%d)"), pc
             IF_COP(, CURRENT_CORE));
    lcd_puts(0, 1, str);
    lcd_update();

    while (1)
    {
        /* TODO: perhaps add button handling in here when we get a polling
           driver some day.
         */
        core_idle();
    }
}

#ifndef STUB
/* Needs to be here or gcc won't find it */
void __div0(void) __attribute__((naked));
void __div0(void)
{
    asm volatile (
        "ldr    r0, [sp] \r\n"
        "mov    r1, #3   \r\n"
        "b      UIE      \r\n"
    );
}
#endif

#endif /* CPU_ARM */