system.c

编译后直接运行的ＭＰ３播放器全部Ｃ语言源代码 一个包含FAT文件系统、系统引导 Boot、FLASH Driver等内容的

    /*** 84-86 ITU1 ***/
  
    IMIA1,IMIB1,OVI1,
    
    /*** 87 Reserved ***/

    UIE87, 
  
    /*** 88-90 ITU2 ***/
  
    IMIA2,IMIB2,OVI2,
    
    /*** 91 Reserved ***/

    UIE91, 
  
    /*** 92-94 ITU3 ***/
  
    IMIA3,IMIB3,OVI3,
    
    /*** 95 Reserved ***/

    UIE95, 
  
    /*** 96-98 ITU4 ***/
  
    IMIA4,IMIB4,OVI4,
    
    /*** 99 Reserved ***/

    UIE99,
    
    /*** 100-103 SCI0 ***/ 
  
    REI0,RXI0,TXI0,TEI0,
  
    /*** 104-107 SCI1 ***/ 
  
    REI1,RXI1,TXI1,TEI1,
  
    /*** 108 Parity Control Unit ***/
  
    UIE108,       
  
    /*** 109 AD Converter ***/
  
    ADITI
    
};


void system_reboot (void)
{
    set_irq_level(15);

    asm volatile ("ldc\t%0,vbr" : : "r"(0));

    PACR2 |= 0x4000; /* for coldstart detection */
    IPRA = 0;
    IPRB = 0;
    IPRC = 0;
    IPRD = 0;
    IPRE = 0;
    ICR = 0;

    asm volatile ("jmp @%0; mov.l @%1,r15" : :
		  "r"(*(int*)0),"r"(4));
}

void UIE (unsigned int pc) /* Unexpected Interrupt or Exception */
{
    bool state = true;
    unsigned int n;
    char str[32];

    asm volatile ("sts\tpr,%0" : "=r"(n));
    
    /* clear screen */
    lcd_clear_display ();
#ifdef HAVE_LCD_BITMAP
    lcd_setfont(FONT_SYSFIXED);
#endif
    /* output exception */
    n = (n - (unsigned)UIE0 - 4)>>2; /* get exception or interrupt number */
    snprintf(str,sizeof(str),"I%02x:%s",n,irqname[n]);
    lcd_puts(0,0,str);
    snprintf(str,sizeof(str),"at %08x",pc);
    lcd_puts(0,1,str);

#ifdef HAVE_LCD_BITMAP
    lcd_update ();
#endif

    while (1)
    {
        volatile int i;
        led (state);
        state = state?false:true;
        
        for (i = 0; i < 240000; ++i);

        /* try to restart firmware if ON is pressed */
#ifdef HAVE_LCD_CHARCELLS
        if (!(PADR & 0x20))
            rolo_load("/archos.mod");
#else
        if (!(PBDR & PBDR_BTN_ON))
            rolo_load("/ajbrec.ajz");
#endif
    }
}

asm (
    "_UIE0:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE1:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE2:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE3:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE4:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE5:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE6:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE7:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE8:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE9:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE10:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE11:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE12:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE13:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE14:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE15:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE16:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE17:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE18:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE19:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE20:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE21:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE22:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE23:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE24:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE25:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE26:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE27:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE28:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE29:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE30:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE31:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE32:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE33:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE34:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE35:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE36:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE37:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE38:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE39:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE40:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE41:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE42:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE43:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE44:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE45:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE46:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE47:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE48:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE49:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE50:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE51:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE52:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE53:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE54:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE55:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE56:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE57:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE58:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE59:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE60:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE61:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE62:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE63:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE64:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE65:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE66:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE67:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE68:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE69:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE70:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE71:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE72:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE73:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE74:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE75:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE76:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE77:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE78:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE79:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE80:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE81:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE82:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE83:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE84:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE85:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE86:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE87:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE88:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE89:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE90:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE91:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE92:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE93:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE94:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE95:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE96:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE97:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE98:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE99:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE100:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE101:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE102:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE103:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE104:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE105:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE106:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE107:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE108:\tbsr\t_UIE\n\tmov.l\t@r15+,r4\t\n"
    "_UIE109:\tbsr\t_UIE\n\tmov.l\t@r15+,r4");

void system_init(void)
{
    /* Disable all interrupts */
    IPRA = 0;
    IPRB = 0;
    IPRC = 0;
    IPRD = 0;
    IPRE = 0;

    /* NMI level low, falling edge on all interrupts */
    ICR = 0;

    /* Enable burst mode on DRAM */
    DCR |= 0x1000;

    /* Activate Warp mode (simultaneous internal and external mem access) */
    BCR |= 0x2000;

    /* Bus state controller initializations. These are only necessary when
       running from flash. The correct settings for player models are not
       verified, so we only do this for the recorder. */
#ifdef HAVE_RECORDING
    WCR1 = 0x4000; /* Long wait states for CS6 (ATA), short for the rest. */
    WCR3 = 0x8000; /* WAIT is pulled up, 1 state inserted for CS6 */
#endif
}