| @@ -1,14 +1,14 @@ | | | @@ -1,14 +1,14 @@ |
| 1 | /* $NetBSD: pbr.S,v 1.16 2008/04/28 20:23:25 martin Exp $ */ | | 1 | /* $NetBSD: pbr.S,v 1.17 2009/11/30 21:37:16 dsl Exp $ */ |
| 2 | | | 2 | |
| 3 | /*- | | 3 | /*- |
| 4 | * Copyright (c) 2003,2004 The NetBSD Foundation, Inc. | | 4 | * Copyright (c) 2003,2004 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. | | 5 | * All rights reserved. |
| 6 | * | | 6 | * |
| 7 | * This code is derived from software contributed to The NetBSD Foundation | | 7 | * This code is derived from software contributed to The NetBSD Foundation |
| 8 | * by David Laight. | | 8 | * by David Laight. |
| 9 | * | | 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without | | 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions | | 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: | | 12 | * are met: |
| 13 | * 1. Redistributions of source code must retain the above copyright | | 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. | | 14 | * notice, this list of conditions and the following disclaimer. |
| @@ -102,27 +102,27 @@ | | | @@ -102,27 +102,27 @@ |
| 102 | .text | | 102 | .text |
| 103 | .code16 | | 103 | .code16 |
| 104 | ENTRY(start) | | 104 | ENTRY(start) |
| 105 | /* | | 105 | /* |
| 106 | * The PC BIOS architecture defines a Boot Parameter Block (BPB) here. | | 106 | * The PC BIOS architecture defines a Boot Parameter Block (BPB) here. |
| 107 | * The actual format varies between different MS-DOS versions, but | | 107 | * The actual format varies between different MS-DOS versions, but |
| 108 | * apparently some system BIOS insist on patching this area | | 108 | * apparently some system BIOS insist on patching this area |
| 109 | * (especially on LS120 drives - which I thought had an MBR...). | | 109 | * (especially on LS120 drives - which I thought had an MBR...). |
| 110 | * The initial jmp and nop are part of the standard and may be | | 110 | * The initial jmp and nop are part of the standard and may be |
| 111 | * tested for by the system BIOS. | | 111 | * tested for by the system BIOS. |
| 112 | */ | | 112 | */ |
| 113 | jmp start0 | | 113 | jmp start0 |
| 114 | nop | | 114 | nop |
| 115 | .ascii "NetBSD40" /* oemname (8 bytes) */ | | 115 | .ascii "NetBSD60" /* oemname (8 bytes) */ |
| 116 | | | 116 | |
| 117 | . = start + MBR_BPB_OFFSET /* move to start of BPB */ | | 117 | . = start + MBR_BPB_OFFSET /* move to start of BPB */ |
| 118 | /* (ensures oemname doesn't overflow) */ | | 118 | /* (ensures oemname doesn't overflow) */ |
| 119 | | | 119 | |
| 120 | . = start + MBR_AFTERBPB /* skip BPB */ | | 120 | . = start + MBR_AFTERBPB /* skip BPB */ |
| 121 | start0: | | 121 | start0: |
| 122 | xor %ax, %ax /* don't trust values of ds, es or ss */ | | 122 | xor %ax, %ax /* don't trust values of ds, es or ss */ |
| 123 | mov %ax, %ds | | 123 | mov %ax, %ds |
| 124 | mov %ax, %es | | 124 | mov %ax, %es |
| 125 | mov %ax, %ss | | 125 | mov %ax, %ss |
| 126 | mov $0xfffc, %sp | | 126 | mov $0xfffc, %sp |
| 127 | | | 127 | |
| 128 | /* A 'reset disk system' request is traditional here... */ | | 128 | /* A 'reset disk system' request is traditional here... */ |