Check-in of baseline 2.6.34 tree
[linux-2.6.34-lpc32xx.git] / arch / alpha / boot / head.S
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