firmware/system.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2002 by Alan Korr
  11  *
  12  * All files in this archive are subject to the GNU General Public License.
  13  * See the file COPYING in the source tree root for full license agreement.
  14  *
  15  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  16  * KIND, either express or implied.
  17  *
  18  ****************************************************************************/
  19 #include <stdio.h>
  20 #include "config.h"
  21 #include <stdbool.h>
  22 #include "lcd.h"
  23 #include "font.h"
  24 #include "system.h"
  25 #include "kernel.h"
  26 #include "thread.h"
  27 #include "timer.h"
  28 #include "inttypes.h"
  29 #include "string.h"
  30
  31 #ifndef SIMULATOR
  32 long cpu_frequency NOCACHEBSS_ATTR = CPU_FREQ;
  33 #endif
  34
  35 #ifdef HAVE_ADJUSTABLE_CPU_FREQ
  36 static int boost_counter NOCACHEBSS_ATTR = 0;
  37 static bool cpu_idle NOCACHEBSS_ATTR = false;
  38
  39 int get_cpu_boost_counter(void)
  40 {
  41     return boost_counter;
  42 }
  43 #ifdef CPU_BOOST_LOGGING
  44 #define MAX_BOOST_LOG 64
  45 static char cpu_boost_calls[MAX_BOOST_LOG][MAX_PATH];
  46 static int cpu_boost_first = 0;
  47 static int cpu_boost_calls_count = 0;
  48 static int cpu_boost_track_message = 0;
  49 int cpu_boost_log_getcount(void)
  50 {
  51     return cpu_boost_calls_count;
  52 }
  53 char * cpu_boost_log_getlog_first(void)
  54 {
  55     if (cpu_boost_calls_count)
  56     {
  57         cpu_boost_track_message = 1;
  58         return cpu_boost_calls[cpu_boost_first];
  59     }
  60     else return NULL;
  61 }
  62 char * cpu_boost_log_getlog_next(void)
  63 {
  64     int message = (cpu_boost_track_message+cpu_boost_first)%MAX_BOOST_LOG;
  65     if (cpu_boost_track_message < cpu_boost_calls_count)
  66     {
  67         cpu_boost_track_message++;
  68         return cpu_boost_calls[message];
  69     }
  70     else return NULL;
  71 }
  72 void cpu_boost_(bool on_off, char* location, int line)
  73 {
  74     if (cpu_boost_calls_count == MAX_BOOST_LOG)
  75     {
  76         cpu_boost_first = (cpu_boost_first+1)%MAX_BOOST_LOG;
  77         cpu_boost_calls_count--;
  78         if (cpu_boost_calls_count < 0)
  79             cpu_boost_calls_count = 0;
  80     }
  81     if (cpu_boost_calls_count < MAX_BOOST_LOG)
  82     {
  83         int message = (cpu_boost_first+cpu_boost_calls_count)%MAX_BOOST_LOG;
  84         snprintf(cpu_boost_calls[message], MAX_PATH,
  85                     "%c %s:%d",on_off==true?'B':'U',location,line);
  86         cpu_boost_calls_count++;
  87     }
  88 #else
  89 void cpu_boost(bool on_off)
  90 {
  91 #endif
  92     if(on_off)
  93     {
  94         /* Boost the frequency if not already boosted */
  95         if(boost_counter++ == 0)
  96             set_cpu_frequency(CPUFREQ_MAX);
  97     }
  98     else
  99     {
 100         /* Lower the frequency if the counter reaches 0 */
 101         if(--boost_counter == 0)
 102         {
 103             if(cpu_idle)
 104                 set_cpu_frequency(CPUFREQ_DEFAULT);
 105             else
 106                 set_cpu_frequency(CPUFREQ_NORMAL);
 107         }
 108
 109         /* Safety measure */
 110         if(boost_counter < 0)
 111             boost_counter = 0;
 112     }
 113 }
 114
 115 void cpu_idle_mode(bool on_off)
 116 {
 117     cpu_idle = on_off;
 118
 119     /* We need to adjust the frequency immediately if the CPU
 120        isn't boosted */
 121     if(boost_counter == 0)
 122     {
 123         if(cpu_idle)
 124             set_cpu_frequency(CPUFREQ_DEFAULT);
 125         else
 126             set_cpu_frequency(CPUFREQ_NORMAL);
 127     }
 128 }
 129 #endif /* HAVE_ADJUSTABLE_CPU_FREQ */
 130
 131
 132 #ifdef HAVE_FLASHED_ROCKBOX
 133 static bool detect_flash_header(uint8_t *addr)
 134 {
 135 #ifndef BOOTLOADER
 136     int oldmode = system_memory_guard(MEMGUARD_NONE);
 137 #endif
 138     struct flash_header hdr;
 139     memcpy(&hdr, addr, sizeof(struct flash_header));
 140 #ifndef BOOTLOADER
 141     system_memory_guard(oldmode);
 142 #endif
 143     return hdr.magic == FLASH_MAGIC;
 144 }
 145 #endif
 146
 147 bool detect_flashed_romimage(void)
 148 {
 149 #ifdef HAVE_FLASHED_ROCKBOX
 150     return detect_flash_header((uint8_t *)FLASH_ROMIMAGE_ENTRY);
 151 #else
 152     return false;
 153 #endif /* HAVE_FLASHED_ROCKBOX */
 154 }
 155
 156 bool detect_flashed_ramimage(void)
 157 {
 158 #ifdef HAVE_FLASHED_ROCKBOX
 159     return detect_flash_header((uint8_t *)FLASH_RAMIMAGE_ENTRY);
 160 #else
 161     return false;
 162 #endif /* HAVE_FLASHED_ROCKBOX */
 163 }
 164
 165 bool detect_original_firmware(void)
 166 {
 167     return !(detect_flashed_ramimage() || detect_flashed_romimage());
 168 }
 169
 170 #if defined(CPU_ARM)
 171
 172 static const char* const uiename[] = {
 173     "Undefined instruction",
 174     "Prefetch abort",
 175     "Data abort",
 176     "Divide by zero"
 177 };
 178
 179 /* Unexpected Interrupt or Exception handler. Currently only deals with
 180    exceptions, but will deal with interrupts later.
 181  */
 182 void UIE(unsigned int pc, unsigned int num)
 183 {
 184     char str[32];
 185
 186     lcd_clear_display();
 187 #ifdef HAVE_LCD_BITMAP
 188     lcd_setfont(FONT_SYSFIXED);
 189 #endif
 190     lcd_puts(0, 0, uiename[num]);
 191     snprintf(str, sizeof(str), "at %08x", pc);
 192     lcd_puts(0, 1, str);
 193     lcd_update();
 194
 195     while (1)
 196     {
 197         /* TODO: perhaps add button handling in here when we get a polling
 198            driver some day.
 199          */
 200     }
 201 }
 202
 203 #ifndef STUB
 204 /* Needs to be here or gcc won't find it */
 205 void __div0(void) __attribute__((naked));
 206 void __div0(void)
 207 {
 208     asm volatile (
 209         "ldr    r0, [sp] \r\n"
 210         "mov    r1, #3   \r\n"
 211         "b      UIE      \r\n"
 212     );
 213 }
 214 #endif
 215
 216 #endif /* CPU_ARM */
 217