1 | ; Project name : XTIDE Universal BIOS |
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2 | ; Description : Int 13h function AH=41h, Check if Extensions Present. |
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3 | |
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4 | ; |
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5 | ; XTIDE Universal BIOS and Associated Tools |
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6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team. |
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7 | ; |
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8 | ; This program is free software; you can redistribute it and/or modify |
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9 | ; it under the terms of the GNU General Public License as published by |
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10 | ; the Free Software Foundation; either version 2 of the License, or |
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11 | ; (at your option) any later version. |
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12 | ; |
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13 | ; This program is distributed in the hope that it will be useful, |
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14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 | ; GNU General Public License for more details. |
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17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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18 | ; |
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19 | |
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20 | ; Section containing code |
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21 | SECTION .text |
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22 | |
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23 | ;-------------------------------------------------------------------- |
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24 | ; Int 13h function AH=41h, Check if Extensions Present. |
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25 | ; |
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26 | ; AH41h_HandlerForCheckIfExtensionsPresent |
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27 | ; Parameters: |
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28 | ; DL: Translated Drive number |
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29 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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30 | ; SS:BP: Ptr to IDEPACK |
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31 | ; Parameters on INTPACK: |
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32 | ; BX: 55AAh |
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33 | ; Returns with INTPACK: |
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34 | ; AH: Major version of EBIOS extensions |
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35 | ; BX: AA55h |
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36 | ; CX: Support bits |
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37 | ; CF: 0 if successful, 1 if error |
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38 | ;-------------------------------------------------------------------- |
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39 | AH41h_HandlerForCheckIfExtensionsPresent: |
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40 | cmp WORD [bp+IDEPACK.intpack+INTPACK.bx], 55AAh |
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41 | jne SHORT .EbiosNotSupported |
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42 | |
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43 | mov BYTE [bp+IDEPACK.intpack+INTPACK.ah], EBIOS_VERSION |
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44 | mov WORD [bp+IDEPACK.intpack+INTPACK.bx], 0AA55h |
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45 | |
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46 | %ifdef RETURN_DPTE_ON_AH48H |
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47 | call AH41h_GetSupportBitsToCX |
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48 | mov [bp+IDEPACK.intpack+INTPACK.cx], cx |
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49 | %else |
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50 | mov WORD [bp+IDEPACK.intpack+INTPACK.cx], ENHANCED_DRIVE_ACCESS_SUPPORT |
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51 | %endif |
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52 | |
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53 | and BYTE [bp+IDEPACK.intpack+INTPACK.flags], ~FLG_FLAGS_CF ; Return with CF cleared |
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54 | jmp Int13h_ReturnFromHandlerWithoutStoringErrorCode |
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55 | .EbiosNotSupported: |
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56 | jmp Int13h_DirectCallToAnotherBios |
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57 | |
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58 | |
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59 | %ifdef RETURN_DPTE_ON_AH48H |
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60 | ;-------------------------------------------------------------------- |
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61 | ; AH41h_GetSupportBitsToCX |
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62 | ; Parameters: |
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63 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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64 | ; Returns: |
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65 | ; CX: Support bits returned by AH=41h |
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66 | ; Corrupts registers: |
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67 | ; Nothing |
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68 | ;-------------------------------------------------------------------- |
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69 | AH41h_GetSupportBitsToCX: |
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70 | mov cx, ENHANCED_DRIVE_ACCESS_SUPPORT |
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71 | |
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72 | ; DPTE needs buffer from RAM so do not return it in lite mode |
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73 | %ifndef USE_AT |
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74 | test BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_FULLMODE |
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75 | jz SHORT .DoNotSetEDDflag |
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76 | %endif |
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77 | |
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78 | %ifdef MODULE_8BIT_IDE OR MODULE_SERIAL |
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79 | ; DPTE contains information for device drivers. We should not return |
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80 | ; DPTE for 8-bit devices since software would think they are 16-bit devices. |
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81 | cmp BYTE [di+DPT_ATA.bDevice], DEVICE_8BIT_ATA |
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82 | jae SHORT .DoNotSetEDDflag |
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83 | %endif |
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84 | |
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85 | or cl, ENHANCED_DISK_DRIVE_SUPPORT ; AH=48h returns DPTE |
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86 | .DoNotSetEDDflag: |
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87 | ret |
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88 | |
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89 | %endif ; RETURN_DPTE_ON_AH48H |
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