projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 | 1 | /* |
| f30c2269 | 2 | * arch/alpha/kernel/head.S |
| 1da177e4 LT |
3 | * |
| 4 | * initial boot stuff.. At this point, the bootloader has already | |
| 5 | * switched into OSF/1 PAL-code, and loaded us at the correct address | |
| 6 | * (START_ADDR). So there isn't much left for us to do: just set up | |
| 7 | * the kernel global pointer and jump to the kernel entry-point. | |
| 8 | */ | |
| 9 | ||
| 92ca5234 | 10 | #include <linux/init.h> |
| e2d5df93 | 11 | #include <asm/asm-offsets.h> |
| ec221208 DH |
12 | #include <asm/pal.h> |
| 13 | #include <asm/setup.h> | |
| 1da177e4 | 14 | |
| 92ca5234 | 15 | __HEAD |
| 1da177e4 | 16 | .globl _stext |
| 1da177e4 LT |
17 | .set noreorder |
| 18 | .globl __start | |
| 19 | .ent __start | |
| 20 | _stext: | |
| 21 | __start: | |
| 22 | .prologue 0 | |
| 23 | br $27,1f | |
| 24 | 1: ldgp $29,0($27) | |
| 25 | /* We need to get current_task_info loaded up... */ | |
| 26 | lda $8,init_thread_union | |
| 27 | /* ... and find our stack ... */ | |
| 28 | lda $30,0x4000 - SIZEOF_PT_REGS($8) | |
| 29 | /* ... and then we can start the kernel. */ | |
| 30 | jsr $26,start_kernel | |
| 31 | call_pal PAL_halt | |
| 32 | .end __start | |
| 33 | ||
| 34 | #ifdef CONFIG_SMP | |
| 35 | .align 3 | |
| 36 | .globl __smp_callin | |
| 37 | .ent __smp_callin | |
| 38 | /* On entry here from SRM console, the HWPCB of the per-cpu | |
| 39 | slot for this processor has been loaded. We've arranged | |
| 40 | for the UNIQUE value for this process to contain the PCBB | |
| 41 | of the target idle task. */ | |
| 42 | __smp_callin: | |
| 43 | .prologue 1 | |
| 44 | ldgp $29,0($27) # First order of business, load the GP. | |
| 45 | ||
| 46 | call_pal PAL_rduniq # Grab the target PCBB. | |
| 47 | mov $0,$16 # Install it. | |
| 48 | call_pal PAL_swpctx | |
| 49 | ||
| 50 | lda $8,0x3fff # Find "current". | |
| 51 | bic $30,$8,$8 | |
| 52 | ||
| 53 | jsr $26,smp_callin | |
| 54 | call_pal PAL_halt | |
| 55 | .end __smp_callin | |
| 56 | #endif /* CONFIG_SMP */ | |
| 57 | ||
| 58 | # | |
| 59 | # The following two functions are needed for supporting SRM PALcode | |
| 60 | # on the PC164 (at least), since that PALcode manages the interrupt | |
| 61 | # masking, and we cannot duplicate the effort without causing problems | |
| 62 | # | |
| 63 | ||
| 64 | .align 3 | |
| 65 | .globl cserve_ena | |
| 66 | .ent cserve_ena | |
| 67 | cserve_ena: | |
| 68 | .prologue 0 | |
| 69 | bis $16,$16,$17 | |
| 70 | lda $16,52($31) | |
| 71 | call_pal PAL_cserve | |
| 72 | ret ($26) | |
| 73 | .end cserve_ena | |
| 74 | ||
| 75 | .align 3 | |
| 76 | .globl cserve_dis | |
| 77 | .ent cserve_dis | |
| 78 | cserve_dis: | |
| 79 | .prologue 0 | |
| 80 | bis $16,$16,$17 | |
| 81 | lda $16,53($31) | |
| 82 | call_pal PAL_cserve | |
| 83 | ret ($26) | |
| 84 | .end cserve_dis | |
| 85 | ||
| 86 | # | |
| 87 | # It is handy, on occasion, to make halt actually just loop. | |
| 88 | # Putting it here means we dont have to recompile the whole | |
| 89 | # kernel. | |
| 90 | # | |
| 91 | ||
| 92 | .align 3 | |
| 93 | .globl halt | |
| 94 | .ent halt | |
| 95 | halt: | |
| 96 | .prologue 0 | |
| 97 | call_pal PAL_halt | |
| 98 | .end halt |