[88] | 1 | ; Project name : XTIDE Universal BIOS |
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[3] | 2 | ; Description : Functions for generating and accessing drive |
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| 3 | ; information to be displayed on boot menu. |
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| 4 | |
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[376] | 5 | ; |
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| 6 | ; XTIDE Universal BIOS and Associated Tools |
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| 7 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team. |
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| 8 | ; |
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| 9 | ; This program is free software; you can redistribute it and/or modify |
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| 10 | ; it under the terms of the GNU General Public License as published by |
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| 11 | ; the Free Software Foundation; either version 2 of the License, or |
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| 12 | ; (at your option) any later version. |
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| 13 | ; |
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| 14 | ; This program is distributed in the hope that it will be useful, |
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| 15 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 17 | ; GNU General Public License for more details. |
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| 18 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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| 19 | ; |
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| 20 | |
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[3] | 21 | ; Section containing code |
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| 22 | SECTION .text |
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| 23 | |
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| 24 | ;-------------------------------------------------------------------- |
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[254] | 25 | ; Creates new BOOTMENUINFO struct for detected hard disk. |
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[3] | 26 | ; |
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[254] | 27 | ; BootMenuInfo_CreateForHardDisk |
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[3] | 28 | ; Parameters: |
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| 29 | ; DL: Drive number |
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| 30 | ; DS:DI: Ptr to Disk Parameter Table |
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| 31 | ; ES:SI: Ptr to 512-byte ATA information read from the drive |
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| 32 | ; Returns: |
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[254] | 33 | ; ES:BX: Ptr to BOOTMENUINFO (if successful) |
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[3] | 34 | ; Corrupts registers: |
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[364] | 35 | ; AX, BX, CX, DX, DI |
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[3] | 36 | ;-------------------------------------------------------------------- |
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[254] | 37 | BootMenuInfo_CreateForHardDisk: |
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| 38 | call BootMenuInfo_ConvertDPTtoBX ; ES:BX now points to new BOOTMENUINFO |
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[3] | 39 | |
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[364] | 40 | ; Store Drive Name |
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| 41 | push ds ; Preserve RAMVARS |
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| 42 | push si |
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[3] | 43 | |
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[364] | 44 | push es ; ES copied to DS |
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| 45 | pop ds |
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[241] | 46 | |
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[254] | 47 | add si, BYTE ATA1.strModel ; DS:SI now points drive name |
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| 48 | lea di, [bx+BOOTMENUINFO.szDrvName] ; ES:DI now points to name destination |
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| 49 | mov cx, MAX_HARD_DISK_NAME_LENGTH / 2 ; Max number of WORDs allowed |
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[121] | 50 | .CopyNextWord: |
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| 51 | lodsw |
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[254] | 52 | xchg al, ah ; Change endianness |
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[121] | 53 | stosw |
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| 54 | loop .CopyNextWord |
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[254] | 55 | xor ax, ax ; Zero AX and clear CF |
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| 56 | stosw ; Terminate with NULL |
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[3] | 57 | |
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| 58 | pop si |
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| 59 | pop ds |
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[364] | 60 | |
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[3] | 61 | ret |
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| 62 | |
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[252] | 63 | |
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[3] | 64 | ;-------------------------------------------------------------------- |
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[254] | 65 | ; BootMenuInfo_GetTotalSectorCount |
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[3] | 66 | ; Parameters: |
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[241] | 67 | ; DS:DI: DPT Pointer |
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[3] | 68 | ; Returns: |
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| 69 | ; BX:DX:AX: 48-bit sector count |
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| 70 | ; Corrupts registers: |
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[252] | 71 | ; CX |
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[128] | 72 | ;-------------------------------------------------------------------- |
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[254] | 73 | BootMenuInfo_GetTotalSectorCount: |
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[252] | 74 | test BYTE [di+DPT.bFlagsLow], FLG_DRVNHEAD_LBA |
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| 75 | jnz SHORT .ReturnFullCapacity |
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| 76 | jmp AH15h_GetSectorCountToBXDXAX |
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| 77 | .ReturnFullCapacity: |
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| 78 | jmp AccessDPT_GetLbaSectorCountToBXDXAX |
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[100] | 79 | |
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| 80 | |
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| 81 | ;-------------------------------------------------------------------- |
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[254] | 82 | ; Returns offset to BOOTMENUINFO based on DPT pointer. |
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[100] | 83 | ; |
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[254] | 84 | ; BootMenuInfo_ConvertDPTtoBX |
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[100] | 85 | ; Parameters: |
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[241] | 86 | ; DS:DI: DPT Pointer |
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[100] | 87 | ; Returns: |
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[254] | 88 | ; BX: Offset to BOOTMENUINFO struct |
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[100] | 89 | ; Corrupts registers: |
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[365] | 90 | ; AX |
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[100] | 91 | ;-------------------------------------------------------------------- |
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[254] | 92 | BootMenuInfo_ConvertDPTtoBX: |
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[241] | 93 | mov ax, di |
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[363] | 94 | sub ax, BYTE RAMVARS_size ; subtract off base of DPTs |
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[254] | 95 | mov bl, DPT_BOOTMENUINFO_SIZE_MULTIPLIER ; BOOTMENUINFO's are a whole number multiple of DPT size |
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[241] | 96 | mul bl |
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[254] | 97 | add ax, BOOTVARS.rgBootNfo ; add base of BOOTMENUINFO |
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[241] | 98 | xchg ax, bx |
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[364] | 99 | ret |
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