| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | /* |
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| 3 | * arch/alpha/kernel/head.S |
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| 4 | * |
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| 5 | * initial boot stuff.. At this point, the bootloader has already |
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| 6 | * switched into OSF/1 PAL-code, and loaded us at the correct address |
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| 7 | * (START_ADDR). So there isn't much left for us to do: just set up |
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| 8 | * the kernel global pointer and jump to the kernel entry-point. |
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| 9 | */ |
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| 10 | |
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| 11 | #include <linux/init.h> |
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| 12 | #include <asm/asm-offsets.h> |
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| 13 | #include <asm/pal.h> |
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| 14 | #include <asm/setup.h> |
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| 15 | |
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| 16 | __HEAD |
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| 17 | .globl _stext |
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| 18 | .set noreorder |
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| 19 | .globl __start |
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| 20 | .ent __start |
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| 21 | _stext: |
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| 22 | __start: |
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| 23 | .prologue 0 |
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| 24 | br $27,1f |
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| 25 | 1: ldgp $29,0($27) |
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| 26 | /* We need to get current_task_info loaded up... */ |
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| 27 | lda $8,init_thread_union |
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| 28 | /* ... and find our stack ... */ |
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| 29 | lda $30,0x4000 - SIZEOF_PT_REGS($8) |
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| 30 | /* ... and then we can start the kernel. */ |
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| 31 | jsr $26,start_kernel |
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| 32 | call_pal PAL_halt |
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| 33 | .end __start |
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| 34 | |
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| 35 | #ifdef CONFIG_SMP |
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| 36 | .align 3 |
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| 37 | .globl __smp_callin |
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| 38 | .ent __smp_callin |
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| 39 | /* On entry here from SRM console, the HWPCB of the per-cpu |
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| 40 | slot for this processor has been loaded. We've arranged |
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| 41 | for the UNIQUE value for this process to contain the PCBB |
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| 42 | of the target idle task. */ |
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| 43 | __smp_callin: |
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| 44 | .prologue 1 |
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| 45 | ldgp $29,0($27) # First order of business, load the GP. |
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| 46 | |
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| 47 | call_pal PAL_rduniq # Grab the target PCBB. |
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| 48 | mov $0,$16 # Install it. |
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| 49 | call_pal PAL_swpctx |
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| 50 | |
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| 51 | lda $8,0x3fff # Find "current" . |
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| 52 | bic $30,$8,$8 |
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| 53 | |
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| 54 | jsr $26,smp_callin |
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| 55 | call_pal PAL_halt |
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| 56 | .end __smp_callin |
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| 57 | #endif /* CONFIG_SMP */ |
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| 58 | |
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| 59 | # |
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| 60 | # The following two functions are needed for supporting SRM PALcode |
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| 61 | # on the PC164 (at least), since that PALcode manages the interrupt |
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| 62 | # masking, and we cannot duplicate the effort without causing problems |
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| 63 | # |
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| 64 | |
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| 65 | .align 3 |
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| 66 | .globl cserve_ena |
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| 67 | .ent cserve_ena |
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| 68 | cserve_ena: |
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| 69 | .prologue 0 |
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| 70 | bis $16,$16,$17 |
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| 71 | lda $16,52($31) |
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| 72 | call_pal PAL_cserve |
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| 73 | ret ($26) |
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| 74 | .end cserve_ena |
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| 75 | |
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| 76 | .align 3 |
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| 77 | .globl cserve_dis |
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| 78 | .ent cserve_dis |
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| 79 | cserve_dis: |
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| 80 | .prologue 0 |
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| 81 | bis $16,$16,$17 |
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| 82 | lda $16,53($31) |
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| 83 | call_pal PAL_cserve |
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| 84 | ret ($26) |
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| 85 | .end cserve_dis |
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| 86 | |
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| 87 | # |
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| 88 | # It is handy, on occasion, to make halt actually just loop. |
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| 89 | # Putting it here means we dont have to recompile the whole |
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| 90 | # kernel. |
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| 91 | # |
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| 92 | |
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| 93 | .align 3 |
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| 94 | .globl halt |
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| 95 | .ent halt |
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| 96 | halt: |
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| 97 | .prologue 0 |
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| 98 | call_pal PAL_halt |
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| 99 | .end halt |
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| 100 | |
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