| | 1 | /*- |
| | 2 | * Copyright (c) 1991 The Regents of the University of California. |
| | 3 | * All rights reserved. |
| | 4 | * |
| | 5 | * This code is derived from software contributed to Berkeley by |
| | 6 | * Computer Consoles Inc. |
| | 7 | * |
| | 8 | * %sccs.include.proprietary.c% |
| | 9 | * |
| | 10 | * @(#)srt0.c 7.2 (Berkeley) %G% |
| | 11 | */ |
| | 12 | |
| | 13 | #include "../include/mtpr.h" |
| | 14 | #define LOCORE |
| | 15 | |
| | 16 | /* |
| | 17 | * Startup code for standalone system |
| | 18 | */ |
| | 19 | |
| | 20 | .globl _end |
| | 21 | .globl _main |
| | 22 | .globl __rtt |
| | 23 | .globl _firstopen |
| | 24 | .globl _start |
| | 25 | .globl _boothowto |
| | 26 | .globl _bootdev |
| | 27 | |
| | 28 | .set HIGH,31 # mask for total disable |
| | 29 | |
| | 30 | #ifndef REL |
| | 31 | .globl _device_space |
| | 32 | _device_space: # Tapemaster config block, etc. |
| | 33 | .space 0x1000-RELOC |
| | 34 | |
| | 35 | .globl _entry |
| | 36 | _entry: |
| | 37 | .word 0x00 # 'call' by relsrt0. |
| | 38 | #endif |
| | 39 | _start: |
| | 40 | mtpr $HIGH,$IPL # just in case |
| | 41 | #ifdef REL |
| | 42 | movl $BOOTRELOC,sp |
| | 43 | |
| | 44 | movl $RELOC,r0 /* source address to copy from */ |
| | 45 | movl $BOOTRELOC,r1 /* destination address */ |
| | 46 | movl tdlen,r2 /* length to copy */ |
| | 47 | addl2 r2,r0 |
| | 48 | addl2 r2,r1 |
| | 49 | mvloop: |
| | 50 | decl r0 |
| | 51 | decl r1 |
| | 52 | movb (r0),(r1) |
| | 53 | decl r2 |
| | 54 | bgeq mvloop |
| | 55 | |
| | 56 | /* |
| | 57 | * zero bss |
| | 58 | */ |
| | 59 | movl aedata,r1 /* destination address */ |
| | 60 | subl3 $_edata,$_end,r2 /* length to zero */ |
| | 61 | zloop: |
| | 62 | movb $0,(r1) |
| | 63 | incl r1 |
| | 64 | decl r2 |
| | 65 | bgeq zloop |
| | 66 | |
| | 67 | mtpr $1,$PACC |
| | 68 | mtpr $1,$PADC |
| | 69 | jmp *abegin |
| | 70 | #endif |
| | 71 | |
| | 72 | begin: |
| | 73 | movl fp,ofp |
| | 74 | movl r11,_boothowto |
| | 75 | movl r10,_bootdev |
| | 76 | movl $1,_firstopen |
| | 77 | callf $4,_main |
| | 78 | #ifdef REL |
| | 79 | halt |
| | 80 | #endif |
| | 81 | ret |
| | 82 | |
| | 83 | __rtt: |
| | 84 | .word 0x0 |
| | 85 | #ifdef REL |
| | 86 | halt |
| | 87 | #endif |
| | 88 | movl ofp,fp |
| | 89 | ret |
| | 90 | |
| | 91 | .data |
| | 92 | abegin: .long begin |
| | 93 | #ifdef REL |
| | 94 | aedata: .long _edata |
| | 95 | tdlen: .long _edata-BOOTRELOC |
| | 96 | #endif |
| | 97 | ofp: .long 0 |
| | 98 | _boothowto: .long 0 |
| | 99 | _bootdev: .long 0 |
projects / unix-history / blame_incremental