BSP for MIPS32 4KC

[mikeci at acm.org (mikeci at acm.org)]

Hi!

Here are the CPU_FLAGS which work for me:

CPU_CFLAGS = -O0 -G0 -EL -msoft-float -mips32 -Wl,-r,-EL


MIPS32 is 32 bit arhitecture, so all registers are 32 bit. So code looks
something like this (example):

unsigned32 _CPU_ISR_Get_level( void )
{
  unsigned int sr;

  mips_get_sr(sr);

  //printf("current sr=%08X, ",sr);

#if (__mips == 3) || (__mips == 32)
/* IE bit and shift down hardware ints into bits 1 thru 6 */
  sr = (sr & SR_IE) | ((sr & 0xfc00) >> 9);

#elif __mips == 1
/* IEC bit and shift down hardware ints into bits 1 thru 6 */
  sr = (sr & SR_IEC) | ((sr & 0xfc00) >> 9);

#else
#error "CPU ISR level: unknown MIPS level for SR handling"
#endif
  //printf("intlevel=%02X\n",sr);
  return sr;
}

This way you can generaly support MIPS32, and in the same time support
other MIPS arhitectures.

I agree that we can discuss this concept in more details, and that it is
not possible to support each and every MIPS CPU.


Regards

Ivica