var_startup.c

来自「eCos操作系统源码」· C语言 代码 · 共 101 行

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// -------------------------------------------
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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>

/*****************************************************************************
var_init_cache_acr --  Initialize the cache and access control registers

INPUT:

OUTPUT:

RETURN VALUE:

     None

*****************************************************************************/
static void var_init_cache_acr(void)
{

    //   Invalidate and disable the cache and ACRs.

    mcf52xx_wr_cacr((CYG_WORD32)0x01000000);
    mcf52xx_wr_acr0((CYG_WORD32)0);
    mcf52xx_wr_acr1((CYG_WORD32)0);

    //   Call a routine to set  up  the  cache  and  ACRs  for  this  specific
    // platform.

    plf_init_cache_acr();

}

/*****************************************************************************
var_reset --  Variant-specific reset vector initialization routine

     This routine must be called with interrupts disabled.

INPUT:

OUTPUT:

RETURN VALUE:

     None

*****************************************************************************/
void var_reset(void)
{

    //   Initialize the processor's vector base register.

    mcf52xx_wr_vbr((CYG_WORD32)__ramvec_start);

    //   Initialize the cache and access control registers.

    var_init_cache_acr();

    //   Do any processor-specific reset initialization.

    proc_reset();
}