Subversion Repositories or1k_old

/* mon960 head.S code: should be extremely simple, since mon960 takes care

/* mon960 head.S code: should be extremely simple, since mon960 takes care

   of almost all our requirements for us.  We're at ipl 31 (highest),

   of almost all our requirements for us.  We're at ipl 31 (highest),

   interrupts are off, we have a C stack frame set up for us, etc.

   interrupts are off, we have a C stack frame set up for us, etc.

   This is modelled after the alpha head.S  (excerpt below), which

   This is modelled after the alpha head.S  (excerpt below), which

   actually does some other cruft before calling start_kernel, but without

   actually does some other cruft before calling start_kernel, but without

   knowning the alpha instruction set I can't tell for sure what's

   knowning the alpha instruction set I can't tell for sure what's

   happening.

   happening.

   For now I'll stick with just a call, as it seems to work in other

   For now I'll stick with just a call, as it seems to work in other

   places.

   places.

alpha head.S:

alpha head.S:

__start:

__start:

        br      $27,1f

        br      $27,1f

1:      ldgp    $29,0($27)

1:      ldgp    $29,0($27)

        lda     $27,start_kernel

        lda     $27,start_kernel

        jsr     $26,($27),start_kernel

        jsr     $26,($27),start_kernel

        halt

        halt

        .end __start

        .end __start

*/

*/

#define __ASSEMBLY__

#define __ASSEMBLY__

#include 

#include 

        .align 4

        .align 4

        .globl _stext

        .globl _stext

        .globl __start

        .globl __start

        .ent __start

        .ent __start

_stext:

_stext:

__start:

__start:

        call start_kernel

        call start_kernel

        halt

        halt

        .end __start

        .end __start