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