| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| Uwe Zeisberger | f30c226 | 2006-10-03 23:01:26 +0200 | [diff] [blame] | 2 | * arch/alpha/kernel/head.S |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| Tim Abbott | 92ca523 | 2009-04-25 22:10:58 -0400 | [diff] [blame] | 10 | #include <linux/init.h> |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <asm/system.h> |
| Sam Ravnborg | e2d5df9 | 2005-09-09 21:28:48 +0200 | [diff] [blame] | 12 | #include <asm/asm-offsets.h> |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | |
| Tim Abbott | 92ca523 | 2009-04-25 22:10:58 -0400 | [diff] [blame] | 14 | __HEAD |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | .globl swapper_pg_dir |
| 16 | .globl _stext |
| 17 | swapper_pg_dir=SWAPPER_PGD |
| 18 | |
| 19 | .set noreorder |
| 20 | .globl __start |
| 21 | .ent __start |
| 22 | _stext: |
| 23 | __start: |
| 24 | .prologue 0 |
| 25 | br $27,1f |
| 26 | 1: ldgp $29,0($27) |
| 27 | /* We need to get current_task_info loaded up... */ |
| 28 | lda $8,init_thread_union |
| 29 | /* ... and find our stack ... */ |
| 30 | lda $30,0x4000 - SIZEOF_PT_REGS($8) |
| 31 | /* ... and then we can start the kernel. */ |
| 32 | jsr $26,start_kernel |
| 33 | call_pal PAL_halt |
| 34 | .end __start |
| 35 | |
| 36 | #ifdef CONFIG_SMP |
| 37 | .align 3 |
| 38 | .globl __smp_callin |
| 39 | .ent __smp_callin |
| 40 | /* On entry here from SRM console, the HWPCB of the per-cpu |
| 41 | slot for this processor has been loaded. We've arranged |
| 42 | for the UNIQUE value for this process to contain the PCBB |
| 43 | of the target idle task. */ |
| 44 | __smp_callin: |
| 45 | .prologue 1 |
| 46 | ldgp $29,0($27) # First order of business, load the GP. |
| 47 | |
| 48 | call_pal PAL_rduniq # Grab the target PCBB. |
| 49 | mov $0,$16 # Install it. |
| 50 | call_pal PAL_swpctx |
| 51 | |
| 52 | lda $8,0x3fff # Find "current". |
| 53 | bic $30,$8,$8 |
| 54 | |
| 55 | jsr $26,smp_callin |
| 56 | call_pal PAL_halt |
| 57 | .end __smp_callin |
| 58 | #endif /* CONFIG_SMP */ |
| 59 | |
| 60 | # |
| 61 | # The following two functions are needed for supporting SRM PALcode |
| 62 | # on the PC164 (at least), since that PALcode manages the interrupt |
| 63 | # masking, and we cannot duplicate the effort without causing problems |
| 64 | # |
| 65 | |
| 66 | .align 3 |
| 67 | .globl cserve_ena |
| 68 | .ent cserve_ena |
| 69 | cserve_ena: |
| 70 | .prologue 0 |
| 71 | bis $16,$16,$17 |
| 72 | lda $16,52($31) |
| 73 | call_pal PAL_cserve |
| 74 | ret ($26) |
| 75 | .end cserve_ena |
| 76 | |
| 77 | .align 3 |
| 78 | .globl cserve_dis |
| 79 | .ent cserve_dis |
| 80 | cserve_dis: |
| 81 | .prologue 0 |
| 82 | bis $16,$16,$17 |
| 83 | lda $16,53($31) |
| 84 | call_pal PAL_cserve |
| 85 | ret ($26) |
| 86 | .end cserve_dis |
| 87 | |
| 88 | # |
| 89 | # It is handy, on occasion, to make halt actually just loop. |
| 90 | # Putting it here means we dont have to recompile the whole |
| 91 | # kernel. |
| 92 | # |
| 93 | |
| 94 | .align 3 |
| 95 | .globl halt |
| 96 | .ent halt |
| 97 | halt: |
| 98 | .prologue 0 |
| 99 | call_pal PAL_halt |
| 100 | .end halt |