hal_misc.c

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    for (p = &__CTOR_END__[-1]; p >= __CTOR_LIST__; p--)
        (*p) ();
#endif
    
} // cyg_hal_invoke_constructors()

/*------------------------------------------------------------------------*/
/* Determine the index of the ls bit of the supplied mask.                */

cyg_uint32 hal_lsbit_index(cyg_uint32 mask)
{
    cyg_uint32 n = mask;

    static const signed char tab[64] =
    { -1, 0, 1, 12, 2, 6, 0, 13, 3, 0, 7, 0, 0, 0, 0, 14, 10,
      4, 0, 0, 8, 0, 0, 25, 0, 0, 0, 0, 0, 21, 27 , 15, 31, 11,
      5, 0, 0, 0, 0, 0, 9, 0, 0, 24, 0, 0 , 20, 26, 30, 0, 0, 0,
      0, 23, 0, 19, 29, 0, 22, 18, 28, 17, 16, 0
    };

    n &= ~(n-1UL);
    n = (n<<16)-n;
    n = (n<<6)+n;
    n = (n<<4)+n;

    return tab[n>>26];
}

/*------------------------------------------------------------------------*/
/* Determine the index of the ms bit of the supplied mask.                */

cyg_uint32 hal_msbit_index(cyg_uint32 mask)
{
    cyg_uint32 x = mask;    
    cyg_uint32 w;

    /* Phase 1: make word with all ones from that one to the right */
    x |= x >> 16;
    x |= x >> 8;
    x |= x >> 4;
    x |= x >> 2;
    x |= x >> 1;

    /* Phase 2: calculate number of "1" bits in the word        */
    w = (x & 0x55555555) + ((x >> 1) & 0x55555555);
    w = (w & 0x33333333) + ((w >> 2) & 0x33333333);
    w = w + (w >> 4);
    w = (w & 0x000F000F) + ((w >> 8) & 0x000F000F);
    return (cyg_uint32)((w + (w >> 16)) & 0xFF) - 1;

}

/*------------------------------------------------------------------------*/
/* Delay for some number of useconds.                                     */
void 
hal_delay_us(int us)
{
    cyg_uint32 val1, val2;
    int diff;
    long usticks;
    long ticks;

    // Calculate the number of counter register ticks per microsecond.
    
    usticks = (CYGNUM_HAL_RTC_PERIOD * CYGNUM_HAL_RTC_DENOMINATOR) / 1000000;

    // Make sure that the value is not zero. This will only happen if the
    // CPU is running at < 2MHz.
    if( usticks == 0 ) usticks = 1;
    
    while( us > 0 )
    {
        int us1 = us;

        // Wait in bursts of less than 10000us to avoid any overflow
        // problems in the multiply.
        if( us1 > 10000 )
            us1 = 10000;

        us -= us1;

        ticks = us1 * usticks;

        HAL_CLOCK_READ(&val1);
        while (ticks > 0) {
            do {
                HAL_CLOCK_READ(&val2);
            } while (val1 == val2);
            diff = val2 - val1;
            if (diff < 0) diff += CYGNUM_HAL_RTC_PERIOD;
            ticks -= diff;
            val1 = val2;
        }
    }
}

/*------------------------------------------------------------------------*/

void hal_arch_program_new_stack(void *_func)
{
    externC void hal_program_new_stack( void *func, CYG_ADDRESS addr);
    hal_program_new_stack( (void *)_func,
                   (CYGMEM_REGION_ram + CYGMEM_REGION_ram_SIZE - sizeof(CYG_ADDRESS)) & ~15 );
}

/*------------------------------------------------------------------------*/
/* Idle thread action                                                     */

#include <cyg/infra/diag.h>

void hal_idle_thread_action( cyg_uint32 count )
{
#if 0 //def CYGPKG_HAL_MIPS_SIM
    if( (count % 1000) == 0 )
    {
        // This code causes a fake interrupt.
        asm volatile (
            "xor    $24,$24,$24;"
            "mtc0   $24,$13;"
            "lui    $25,%%hi(1f);"
            "ori    $25,$25,%%lo(1f);"
            "j      other_vector;"
            "nop;"
            "1:"
            :
            :
            : "t8", "t9"
            );
    }
#endif
#if 0 //def CYGPKG_HAL_MIPS_TX39_JMR3904

    if( (count % 100000 ) == 0 )
    {
//        cyg_uint32 tval, isr, imr, ilr;
          cyg_uint32 sr = 0, cr = 0, ctr = 0, cpr = 0;
//        HAL_CLOCK_READ( &tval );
//        HAL_READ_UINT32( 0xFFFFC000, isr );
//        HAL_READ_UINT32( 0xFFFFC004, imr );
//        HAL_READ_UINT32( 0xFFFFC01C, ilr );
//        CYG_TRACE2(1, "Timer value, ISR ",tval, isr);
//        CYG_TRACE2(1, "IMR ILR0 ", imr, ilr);

//        asm volatile (
//            "mfc0  %0,$12;"
//            "nop; nop; nop;"
//            "mfc0  %1,$13;"
//            "nop; nop; nop;"
//            "mfc0  %2,$9;"
//            "nop; nop; nop;"
//            "mfc0  %3,$11;"
//            "nop; nop; nop;"
//            : "=r"(sr), "=r"(cr), "=r"(ctr), "=r"(cpr)
//            );

        
//        diag_printf("Status %08x ", sr );
//       diag_printf("Cause %08x ", cr );
//        diag_printf("Counter %08x ", ctr );
//        diag_printf("Compare %08x\n", cpr);

#if 0
        asm volatile (
            "mfc0  %0,$12;"
            "nop; nop; nop;"
            : "=r"(sr)
            );
        diag_write_string("Status "); diag_write_hex( sr );

        asm volatile (
            "mfc0  %0,$13;"
            "nop; nop; nop;"
            : "=r"(cr)
            );
        diag_write_string(" Cause "); diag_write_hex( cr );

        asm volatile (
            "mfc0  %0,$9;"
            "nop; nop; nop;"
            : "=r"(ctr)
            );
        diag_write_string(" Counter "); diag_write_hex( ctr );

        asm volatile (
            "mfc0  %0,$11;"
            "nop; nop; nop;"
            : "=r"(cpr)
            );
        diag_write_string(" Compare "); diag_write_hex( cpr );
        diag_write_string( "\n" );
        
#endif
#if 1         
        asm volatile (
            "mfc0  %0,$12;"
            "nop; nop; nop;"
            : "=r"(sr)
            );

        asm volatile (
            "mfc0  %0,$13;"
            "nop; nop; nop;"
            : "=r"(cr)
            );

        CYG_INSTRUMENT_USER( 1, sr, cr );

        asm volatile (
            "mfc0  %0,$9;"
            "nop; nop; nop;"
            : "=r"(ctr)
            );

        asm volatile (
            "mfc0  %0,$11;"
            "nop; nop; nop;"
            : "=r"(cpr)
            );
        
        CYG_INSTRUMENT_USER( 2, ctr, cpr );
#endif
        
//        if( count == 4 )
//        {
//            HAL_ENABLE_INTERRUPTS();
//        }
        
//        if( count >= 10 )
//            for(;;);
    }
#endif
#if 0
    {
        static CYG_WORD32 istat[3] = { 0xffffffff,0xffffffff,0xffffffff };
        int i;
        for( i = 0; i < 3; i++ )
        {
            CYG_WORD32 reg, sr;
            HAL_READ_UINT32( CYGHWR_HAL_MIPS_VRC4373_INTC_STAT0 + i * CYGHWR_HAL_MIPS_VRC4373_INTC_MASK_OFF, reg );
            if( reg != istat[i] )
            {
                hal_diag_ai_write_char('~');
                hal_diag_ai_write_char('0'+i);
                hal_diag_ai_write_hex8( reg );
                istat[i] = reg;
                HAL_READ_UINT32( CYGHWR_HAL_MIPS_VRC4373_INTC_MASK0 + i * CYGHWR_HAL_MIPS_VRC4373_INTC_MASK_OFF, reg );
                hal_diag_ai_write_char('.');                
                hal_diag_ai_write_hex8( reg );
#if 0                
                asm volatile (
                    "mfc0  %0,$12;"
                    "nop; nop; nop;"
                    : "=r"(sr)
                    );
                hal_diag_ai_write_char('.');                
                hal_diag_ai_write_hex8( sr );
#endif
            }
        }
    }
    {
        static CYG_WORD32 old_pins = 0;
        CYG_WORD32 reg;        
        HAL_READ_UINT32( CYGHWR_HAL_MIPS_VRC4373_INTC_PINS, reg );
        if( reg != old_pins )
        {
            hal_diag_ai_write_char('%');                
            hal_diag_ai_write_hex8( reg );
            old_pins = reg;
        }
    }
#endif
#if 0 //def CYGPKG_HAL_MIPS_VR4300_VRC4373

    // Wiggle one of the leds to show we are running
    
    if( (count % 50000 ) == 0 )
    {
        cyg_uint8 lr;
        { int i; for( i = 0; i < 200; i++ ); }
        HAL_READ_UINT8( 0xc2000008, lr );
        lr ^= 2;
        { int i; for( i = 0; i < 200; i++ ); }
        HAL_WRITE_UINT8( 0xc2000008, lr );

    }
#endif    
}

/*------------------------------------------------------------------------*/
/* End of hal_misc.c                                                      */