proc_startup.c

来自「eCos操作系统源码」· C语言 代码 · 共 91 行

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// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
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#include <cyg/infra/cyg_type.h>
#include <pkgconf/hal.h>
#include <cyg/hal/hal_startup.h>
#include <cyg/hal/hal_memmap.h>
#include <cyg/hal/hal_arch.h>
#include <cyg/hal/hal_intr.h>

/*****************************************************************************
proc_reset --  Processor-specific reset vector initialization routine

     This routine must be called with interrupts disabled.

INPUT:

OUTPUT:

RETURN VALUE:

     None

*****************************************************************************/
void proc_reset(void)
{
    int i;

    //   Set up the mapping of our internal registers.  The LSB indicates that
    // the registers are valid.

    mcf5272_wr_mbar((CYG_WORD32)(MCF5272_MBAR | 1));

    //   Initialize the vector base register in the interrupt controller.

    MCF5272_SIM->intc.ipvr = HAL_PROG_INT_VEC_BASE;

    //   Initialize the  interrupt  control  register  and  the  icr  priority
    // mirror.  Disable all interrupts by setting all priorities to zero.

    for (i=0; i < 4; i++)
    {
        MCF5272_SIM->intc.icr[i] = hal_icr_pri_mirror[i] = 0x88888888;
    }

    //   Enable/disable the data transfter acknowledge output pin.

    MCF5272_SIM->gpio.pbcnt = ((MCF5272_SIM->gpio.pbcnt &
                                ~(MCF5272_GPIO_PBCNT_TA_MSK)) |
                               ((HAL_MCF5272_ENABLE_DATA_TA) ?
                                (MCF5272_GPIO_PBCNT_TA_EN) :
                                (MCF5272_GPIO_PBCNT_TA_DE)));

    //   Do any platform-specific reset initialization.

    plf_reset();
}