| Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * arch/alpha/boot/head.S |
| 4 | * |
| 5 | * initial bootloader stuff.. |
| 6 | */ |
| 7 | |
| Will Deacon | c3d6b62 | 2013-03-08 12:43:37 -0800 | [diff] [blame] | 8 | #include <asm/pal.h> |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | |
| 10 | .set noreorder |
| 11 | .globl __start |
| 12 | .ent __start |
| 13 | __start: |
| 14 | br $29,2f |
| 15 | 2: ldgp $29,0($29) |
| 16 | jsr $26,start_kernel |
| 17 | call_pal PAL_halt |
| 18 | .end __start |
| 19 | |
| 20 | .align 5 |
| 21 | .globl wrent |
| 22 | .ent wrent |
| 23 | wrent: |
| 24 | .prologue 0 |
| 25 | call_pal PAL_wrent |
| 26 | ret ($26) |
| 27 | .end wrent |
| 28 | |
| 29 | .align 5 |
| 30 | .globl wrkgp |
| 31 | .ent wrkgp |
| 32 | wrkgp: |
| 33 | .prologue 0 |
| 34 | call_pal PAL_wrkgp |
| 35 | ret ($26) |
| 36 | .end wrkgp |
| 37 | |
| 38 | .align 5 |
| 39 | .globl switch_to_osf_pal |
| 40 | .ent switch_to_osf_pal |
| 41 | switch_to_osf_pal: |
| 42 | subq $30,128,$30 |
| 43 | .frame $30,128,$26 |
| 44 | stq $26,0($30) |
| 45 | stq $1,8($30) |
| 46 | stq $2,16($30) |
| 47 | stq $3,24($30) |
| 48 | stq $4,32($30) |
| 49 | stq $5,40($30) |
| 50 | stq $6,48($30) |
| 51 | stq $7,56($30) |
| 52 | stq $8,64($30) |
| 53 | stq $9,72($30) |
| 54 | stq $10,80($30) |
| 55 | stq $11,88($30) |
| 56 | stq $12,96($30) |
| 57 | stq $13,104($30) |
| 58 | stq $14,112($30) |
| 59 | stq $15,120($30) |
| 60 | .prologue 0 |
| 61 | |
| 62 | stq $30,0($17) /* save KSP in PCB */ |
| 63 | |
| 64 | bis $30,$30,$20 /* a4 = KSP */ |
| 65 | br $17,1f |
| 66 | |
| 67 | ldq $26,0($30) |
| 68 | ldq $1,8($30) |
| 69 | ldq $2,16($30) |
| 70 | ldq $3,24($30) |
| 71 | ldq $4,32($30) |
| 72 | ldq $5,40($30) |
| 73 | ldq $6,48($30) |
| 74 | ldq $7,56($30) |
| 75 | ldq $8,64($30) |
| 76 | ldq $9,72($30) |
| 77 | ldq $10,80($30) |
| 78 | ldq $11,88($30) |
| 79 | ldq $12,96($30) |
| 80 | ldq $13,104($30) |
| 81 | ldq $14,112($30) |
| 82 | ldq $15,120($30) |
| 83 | addq $30,128,$30 |
| 84 | ret ($26) |
| 85 | 1: call_pal PAL_swppal |
| 86 | .end switch_to_osf_pal |
| 87 | |
| 88 | .align 3 |
| 89 | .globl tbi |
| 90 | .ent tbi |
| 91 | tbi: |
| 92 | .prologue 0 |
| 93 | call_pal PAL_tbi |
| 94 | ret ($26) |
| 95 | .end tbi |
| 96 | |
| 97 | .align 3 |
| 98 | .globl halt |
| 99 | .ent halt |
| 100 | halt: |
| 101 | .prologue 0 |
| 102 | call_pal PAL_halt |
| 103 | .end halt |
| 104 | |
| 105 | /* $16 - new stack page */ |
| 106 | .align 3 |
| 107 | .globl move_stack |
| 108 | .ent move_stack |
| 109 | move_stack: |
| 110 | .prologue 0 |
| 111 | lda $0, 0x1fff($31) |
| 112 | and $0, $30, $1 /* Stack offset */ |
| 113 | or $1, $16, $16 /* New stack pointer */ |
| 114 | mov $30, $1 |
| 115 | mov $16, $2 |
| 116 | 1: ldq $3, 0($1) /* Move the stack */ |
| 117 | addq $1, 8, $1 |
| 118 | stq $3, 0($2) |
| 119 | and $0, $1, $4 |
| 120 | addq $2, 8, $2 |
| 121 | bne $4, 1b |
| 122 | mov $16, $30 |
| 123 | ret ($26) |
| 124 | .end move_stack |