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   1 /*
   2  * arch/alpha/boot/head.S
   3  *
   4  * initial bootloader stuff..
   5  */
   6
   7 #include <asm/system.h>
   8
   9         .set noreorder
  10         .globl  __start
  11         .ent    __start
  12 __start:
  13         br      $29,2f
  14 2:      ldgp    $29,0($29)
  15         jsr     $26,start_kernel
  16         call_pal PAL_halt
  17         .end __start
  18
  19         .align 5
  20         .globl  wrent
  21         .ent    wrent
  22 wrent:
  23         .prologue 0
  24         call_pal PAL_wrent
  25         ret ($26)
  26         .end wrent
  27
  28         .align 5
  29         .globl  wrkgp
  30         .ent    wrkgp
  31 wrkgp:
  32         .prologue 0
  33         call_pal PAL_wrkgp
  34         ret ($26)
  35         .end wrkgp
  36
  37         .align 5
  38         .globl  switch_to_osf_pal
  39         .ent    switch_to_osf_pal
  40 switch_to_osf_pal:
  41         subq    $30,128,$30
  42         .frame  $30,128,$26
  43         stq     $26,0($30)
  44         stq     $1,8($30)
  45         stq     $2,16($30)
  46         stq     $3,24($30)
  47         stq     $4,32($30)
  48         stq     $5,40($30)
  49         stq     $6,48($30)
  50         stq     $7,56($30)
  51         stq     $8,64($30)
  52         stq     $9,72($30)
  53         stq     $10,80($30)
  54         stq     $11,88($30)
  55         stq     $12,96($30)
  56         stq     $13,104($30)
  57         stq     $14,112($30)
  58         stq     $15,120($30)
  59         .prologue 0
  60
  61         stq     $30,0($17)      /* save KSP in PCB */
  62
  63         bis     $30,$30,$20     /* a4 = KSP */
  64         br      $17,1f
  65
  66         ldq     $26,0($30)
  67         ldq     $1,8($30)
  68         ldq     $2,16($30)
  69         ldq     $3,24($30)
  70         ldq     $4,32($30)
  71         ldq     $5,40($30)
  72         ldq     $6,48($30)
  73         ldq     $7,56($30)
  74         ldq     $8,64($30)
  75         ldq     $9,72($30)
  76         ldq     $10,80($30)
  77         ldq     $11,88($30)
  78         ldq     $12,96($30)
  79         ldq     $13,104($30)
  80         ldq     $14,112($30)
  81         ldq     $15,120($30)
  82         addq    $30,128,$30
  83         ret ($26)
  84 1:      call_pal PAL_swppal
  85         .end    switch_to_osf_pal
  86
  87         .align 3
  88         .globl  tbi
  89         .ent    tbi
  90 tbi:
  91         .prologue 0
  92         call_pal PAL_tbi
  93         ret     ($26)
  94         .end tbi
  95
  96         .align 3
  97         .globl  halt
  98         .ent    halt
  99 halt:
 100         .prologue 0
 101         call_pal PAL_halt
 102         .end halt
 103
 104 /* $16 - new stack page */
 105         .align 3
 106         .globl  move_stack
 107         .ent    move_stack
 108 move_stack:
 109         .prologue 0
 110         lda     $0, 0x1fff($31)
 111         and     $0, $30, $1                     /* Stack offset */
 112         or      $1, $16, $16                    /* New stack pointer */
 113         mov     $30, $1
 114         mov     $16, $2
 115 1:      ldq     $3, 0($1)                       /* Move the stack */
 116         addq    $1, 8, $1
 117         stq     $3, 0($2)
 118         and     $0, $1, $4
 119         addq    $2, 8, $2
 120         bne     $4, 1b
 121         mov     $16, $30
 122         ret     ($26)
 123         .end move_stack