Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * arch/alpha/kernel/head.S

 *

 * initial boot stuff.. At this point, the bootloader has already

 * switched into OSF/1 PAL-code, and loaded us at the correct address

 * (START_ADDR).  So there isn't much left for us to do: just set up

 * the kernel global pointer and jump to the kernel entry-point.

 */

#include 

#include 

.section .text.head, "ax"

.globl swapper_pg_dir

.globl _stext

swapper_pg_dir=SWAPPER_PGD

        .set noreorder

        .globl  __start

        .ent    __start

_stext:

__start:

        .prologue 0

        br      $27,1f

1:      ldgp    $29,0($27)

        /* We need to get current_task_info loaded up...  */

        lda     $8,init_thread_union

        /* ... and find our stack ... */

        lda     $30,0x4000 - SIZEOF_PT_REGS($8)

        /* ... and then we can start the kernel.  */

        jsr     $26,start_kernel

        call_pal PAL_halt

        .end __start

#ifdef CONFIG_SMP

        .align 3

        .globl  __smp_callin

        .ent    __smp_callin

        /* On entry here from SRM console, the HWPCB of the per-cpu

           slot for this processor has been loaded.  We've arranged

           for the UNIQUE value for this process to contain the PCBB

           of the target idle task.  */

__smp_callin:

        .prologue 1

        ldgp    $29,0($27)      # First order of business, load the GP.

        call_pal PAL_rduniq     # Grab the target PCBB.

        mov     $0,$16          # Install it.

        call_pal PAL_swpctx

        lda     $8,0x3fff       # Find "current".

        bic     $30,$8,$8

        jsr     $26,smp_callin

        call_pal PAL_halt

        .end __smp_callin

#endif /* CONFIG_SMP */

        #

        # The following two functions are needed for supporting SRM PALcode

        # on the PC164 (at least), since that PALcode manages the interrupt

        # masking, and we cannot duplicate the effort without causing problems

        #

        .align 3

        .globl  cserve_ena

        .ent    cserve_ena

cserve_ena:

        .prologue 0

        bis     $16,$16,$17

        lda     $16,52($31)

        call_pal PAL_cserve

        ret     ($26)

        .end    cserve_ena

        .align 3

        .globl  cserve_dis

        .ent    cserve_dis

cserve_dis:

        .prologue 0

        bis     $16,$16,$17

        lda     $16,53($31)

        call_pal PAL_cserve

        ret     ($26)

        .end    cserve_dis

        #

        # It is handy, on occasion, to make halt actually just loop.

        # Putting it here means we dont have to recompile the whole

        # kernel.

        #

        .align 3

        .globl  halt

        .ent    halt

halt:

        .prologue 0

        call_pal PAL_halt

        .end    halt