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/*
 * alpha/boot/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.
 */

#define __ASSEMBLY__
#include <asm/system.h>

#define halt call_pal PAL_halt

.globl swapper_pg_dir
.globl _stext
swapper_pg_dir=SWAPPER_PGD

        .set noreorder
        .globl  __start
        .ent    __start
_stext:
__start:
        br      $27,1f
1:      ldgp    $29,0($27)
        lda     $27,start_kernel
        jsr     $26,($27),start_kernel
        halt
        .end __start

        .align 3
        .globl  wrent
        .ent    wrent
wrent:
        call_pal PAL_wrent
        ret     ($26)
        .end wrent

        .align 3
        .globl  wrkgp
        .ent    wrkgp
wrkgp:
        call_pal PAL_wrkgp
        ret     ($26)
        .end wrkgp

        .align 3
        .globl  wrusp
        .ent    wrusp
wrusp:
        call_pal PAL_wrusp
        ret     ($26)
        .end wrusp

        .align 3
        .globl  rdusp
        .ent    rdusp
rdusp:
        call_pal PAL_rdusp
        ret     ($26)
        .end rdusp

        .align 3
        .globl  tbi
        .ent    tbi
tbi:
        call_pal PAL_tbi
        ret     ($26)
        .end tbi

        .align 3
        .globl  imb
        .ent    imb
imb:
        call_pal PAL_imb
        ret     ($26)
        .end imb

        .align 3
        .globl  rdmces
        .ent    rdmces
rdmces:
        call_pal PAL_rdmces
        ret     ($26)
        .end rdmces

        .align 3
        .globl  wrmces
        .ent    wrmces
wrmces:
        call_pal PAL_wrmces
        ret     ($26)
        .end wrmces

        .align 3
        .globl  whami
        .ent    whami
whami:
        call_pal PAL_whami
        ret     ($26)
        .end whami
 
        .align 3
        .globl  wripir
        .ent    wripir
wripir:
        call_pal PAL_wripir
        ret     ($26)
        .end wripir

        .align 3
        .globl  cserve_ena
        .ent    cserve_ena
cserve_ena:
        lda     $30,-0x08($30)
        stq     $17,0($30)
        bis     $16,$16,$17
        lda     $16,52($31)
        call_pal PAL_cserve
        ldq     $17,0($30)
        lda     $30,0x08($30)
        ret     ($26)
        .end    cserve_ena

        .align 3
        .globl  cserve_dis
        .ent    cserve_dis
cserve_dis:
        lda     $30,-0x08($30)
        stq     $17,0($30)
        bis     $16,$16,$17
        lda     $16,53($31)
        call_pal PAL_cserve
        ldq     $17,0($30)
        lda     $30,0x08($30)
        ret     ($26)
        .end    cserve_dis

        #
        # The following two functions don't need trapb/excb instructions
        # around the mf_fpcr/mt_fpcr instructions because (a) the kernel
        # never generates arithmetic faults and (b) call_pal instructions
        # are implied trap barriers.
        #
        .align 3
        .globl  rdfpcr
        .ent    rdfpcr
rdfpcr:
        lda     $30,-0x10($30)
        stt     $f0,0($30)
        mf_fpcr $f0
        stt     $f0,8($30)
        ldt     $f0,0($30)
        ldq     $0,8($30)
        lda     $30,0x10($30)
        ret     ($26)
        .end    rdfpcr

        .align 3
        .globl  wrfpcr
        .ent    wrfpcr
wrfpcr:
        lda     $30,-0x10($30)
        stt     $f0,0($30)
        stq     $16,8($30)
        ldt     $f0,8($30)
        mt_fpcr $f0
        ldt     $f0,0($30)
        lda     $30,0x10($30)
        ret     ($26)
        .end    wrfpcr