1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* 2 /*
3 * arch/alpha/boot/head.S 3 * arch/alpha/boot/head.S
4 * 4 *
5 * initial bootloader stuff.. 5 * initial bootloader stuff..
6 */ 6 */
7 7
8 #include <asm/pal.h> 8 #include <asm/pal.h>
9 9
10 .set noreorder 10 .set noreorder
11 .globl __start 11 .globl __start
12 .ent __start 12 .ent __start
13 __start: 13 __start:
14 br $29,2f 14 br $29,2f
15 2: ldgp $29,0($29) 15 2: ldgp $29,0($29)
16 jsr $26,start_kernel 16 jsr $26,start_kernel
17 call_pal PAL_halt 17 call_pal PAL_halt
18 .end __start 18 .end __start
19 19
20 .align 5 20 .align 5
21 .globl wrent 21 .globl wrent
22 .ent wrent 22 .ent wrent
23 wrent: 23 wrent:
24 .prologue 0 24 .prologue 0
25 call_pal PAL_wrent 25 call_pal PAL_wrent
26 ret ($26) 26 ret ($26)
27 .end wrent 27 .end wrent
28 28
29 .align 5 29 .align 5
30 .globl wrkgp 30 .globl wrkgp
31 .ent wrkgp 31 .ent wrkgp
32 wrkgp: 32 wrkgp:
33 .prologue 0 33 .prologue 0
34 call_pal PAL_wrkgp 34 call_pal PAL_wrkgp
35 ret ($26) 35 ret ($26)
36 .end wrkgp 36 .end wrkgp
37 37
38 .align 5 38 .align 5
39 .globl switch_to_osf_pal 39 .globl switch_to_osf_pal
40 .ent switch_to_osf_pal 40 .ent switch_to_osf_pal
41 switch_to_osf_pal: 41 switch_to_osf_pal:
42 subq $30,128,$30 42 subq $30,128,$30
43 .frame $30,128,$26 43 .frame $30,128,$26
44 stq $26,0($30) 44 stq $26,0($30)
45 stq $1,8($30) 45 stq $1,8($30)
46 stq $2,16($30) 46 stq $2,16($30)
47 stq $3,24($30) 47 stq $3,24($30)
48 stq $4,32($30) 48 stq $4,32($30)
49 stq $5,40($30) 49 stq $5,40($30)
50 stq $6,48($30) 50 stq $6,48($30)
51 stq $7,56($30) 51 stq $7,56($30)
52 stq $8,64($30) 52 stq $8,64($30)
53 stq $9,72($30) 53 stq $9,72($30)
54 stq $10,80($30) 54 stq $10,80($30)
55 stq $11,88($30) 55 stq $11,88($30)
56 stq $12,96($30) 56 stq $12,96($30)
57 stq $13,104($30) 57 stq $13,104($30)
58 stq $14,112($30) 58 stq $14,112($30)
59 stq $15,120($30) 59 stq $15,120($30)
60 .prologue 0 60 .prologue 0
61 61
62 stq $30,0($17) /* save KSP in 62 stq $30,0($17) /* save KSP in PCB */
63 63
64 bis $30,$30,$20 /* a4 = KSP */ 64 bis $30,$30,$20 /* a4 = KSP */
65 br $17,1f 65 br $17,1f
66 66
67 ldq $26,0($30) 67 ldq $26,0($30)
68 ldq $1,8($30) 68 ldq $1,8($30)
69 ldq $2,16($30) 69 ldq $2,16($30)
70 ldq $3,24($30) 70 ldq $3,24($30)
71 ldq $4,32($30) 71 ldq $4,32($30)
72 ldq $5,40($30) 72 ldq $5,40($30)
73 ldq $6,48($30) 73 ldq $6,48($30)
74 ldq $7,56($30) 74 ldq $7,56($30)
75 ldq $8,64($30) 75 ldq $8,64($30)
76 ldq $9,72($30) 76 ldq $9,72($30)
77 ldq $10,80($30) 77 ldq $10,80($30)
78 ldq $11,88($30) 78 ldq $11,88($30)
79 ldq $12,96($30) 79 ldq $12,96($30)
80 ldq $13,104($30) 80 ldq $13,104($30)
81 ldq $14,112($30) 81 ldq $14,112($30)
82 ldq $15,120($30) 82 ldq $15,120($30)
83 addq $30,128,$30 83 addq $30,128,$30
84 ret ($26) 84 ret ($26)
85 1: call_pal PAL_swppal 85 1: call_pal PAL_swppal
86 .end switch_to_osf_pal 86 .end switch_to_osf_pal
87 87
88 .align 3 88 .align 3
89 .globl tbi 89 .globl tbi
90 .ent tbi 90 .ent tbi
91 tbi: 91 tbi:
92 .prologue 0 92 .prologue 0
93 call_pal PAL_tbi 93 call_pal PAL_tbi
94 ret ($26) 94 ret ($26)
95 .end tbi 95 .end tbi
96 96
97 .align 3 97 .align 3
98 .globl halt 98 .globl halt
99 .ent halt 99 .ent halt
100 halt: 100 halt:
101 .prologue 0 101 .prologue 0
102 call_pal PAL_halt 102 call_pal PAL_halt
103 .end halt 103 .end halt
104 104
105 /* $16 - new stack page */ 105 /* $16 - new stack page */
106 .align 3 106 .align 3
107 .globl move_stack 107 .globl move_stack
108 .ent move_stack 108 .ent move_stack
109 move_stack: 109 move_stack:
110 .prologue 0 110 .prologue 0
111 lda $0, 0x1fff($31) 111 lda $0, 0x1fff($31)
112 and $0, $30, $1 112 and $0, $30, $1 /* Stack offset */
113 or $1, $16, $16 113 or $1, $16, $16 /* New stack pointer */
114 mov $30, $1 114 mov $30, $1
115 mov $16, $2 115 mov $16, $2
116 1: ldq $3, 0($1) 116 1: ldq $3, 0($1) /* Move the stack */
117 addq $1, 8, $1 117 addq $1, 8, $1
118 stq $3, 0($2) 118 stq $3, 0($2)
119 and $0, $1, $4 119 and $0, $1, $4
120 addq $2, 8, $2 120 addq $2, 8, $2
121 bne $4, 1b 121 bne $4, 1b
122 mov $16, $30 122 mov $16, $30
123 ret ($26) 123 ret ($26)
124 .end move_stack 124 .end move_stack
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