| 1 | ; Project name : XTIDE Universal BIOS |
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| 2 | ; Description : Int 13h function AH=48h, Get Extended Drive Parameters. |
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| 3 | |
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| 4 | ; Section containing code |
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| 5 | SECTION .text |
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| 6 | |
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| 7 | ;-------------------------------------------------------------------- |
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| 8 | ; Int 13h function AH=48h, Get Extended Drive Parameters. |
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| 9 | ; |
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| 10 | ; AH48h_GetExtendedDriveParameters |
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| 11 | ; Parameters: |
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| 12 | ; SI: Same as in INTPACK |
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| 13 | ; DL: Translated Drive number |
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| 14 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 15 | ; SS:BP: Ptr to IDEPACK |
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| 16 | ; Parameters on INTPACK: |
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| 17 | ; DS:SI: Ptr to Extended Drive Information Table to fill |
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| 18 | ; Returns with INTPACK: |
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| 19 | ; AH: Int 13h return status |
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| 20 | ; DS:SI: Ptr to Extended Drive Information Table |
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| 21 | ; CF: 0 if succesfull, 1 if error |
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| 22 | ;-------------------------------------------------------------------- |
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| 23 | ALIGN JUMP_ALIGN |
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| 24 | AH48h_HandlerForGetExtendedDriveParameters: |
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| 25 | ; Get our buffer to ES:SI |
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| 26 | push di |
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| 27 | call FindDPT_ForNewDriveToDSDI |
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| 28 | lea si, [di+LARGEST_DPT_SIZE] ; IdeCommand.asm required fake DPT |
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| 29 | pop di |
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| 30 | push ds |
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| 31 | pop es |
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| 32 | |
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| 33 | ; Get Drive ID and total sector count from it |
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| 34 | call AH25h_GetDriveInformationToBufferInESSI |
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| 35 | jc SHORT .ReturnWithError |
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| 36 | call AtaID_GetTotalSectorCountToBXDXAXfromAtaInfoInESSI |
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| 37 | xchg cx, ax ; Sector count now in BX:DX:CX |
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| 38 | |
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| 39 | ; Point ES:DI to Destination buffer |
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| 40 | mov di, [bp+IDEPACK.intpack+INTPACK.si] |
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| 41 | mov es, [bp+IDEPACK.intpack+INTPACK.ds] |
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| 42 | mov ax, MINIMUM_EDRIVEINFO_SIZE |
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| 43 | cmp WORD [es:di+EDRIVE_INFO.wSize], ax |
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| 44 | jb SHORT .BufferTooSmall |
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| 45 | je SHORT .SkipEddConfigurationParameters |
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| 46 | |
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| 47 | ; We do not support EDD Configuration Parameters so set to FFFF:FFFFh |
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| 48 | xor ax, ax |
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| 49 | dec ax ; AX = FFFFh |
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| 50 | mov [es:di+EDRIVE_INFO.fpEDDparams], ax |
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| 51 | mov [es:di+EDRIVE_INFO.fpEDDparams+2], ax |
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| 52 | mov ax, EDRIVE_INFO_size |
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| 53 | |
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| 54 | ; Fill Extended Drive Information Table in ES:DI |
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| 55 | .SkipEddConfigurationParameters: |
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| 56 | stosw ; Store Extended Drive Information Table size |
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| 57 | mov al, FLG_DMA_BOUNDARY_ERRORS_HANDLED_BY_BIOS |
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| 58 | stosw |
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| 59 | add di, BYTE 12 ; Skip CHS parameters |
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| 60 | xchg ax, cx |
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| 61 | stosw ; LBA WORD 0 |
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| 62 | xchg ax, dx |
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| 63 | stosw ; LBA WORD 1 |
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| 64 | xchg ax, bx |
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| 65 | stosw ; LBA WORD 2 |
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| 66 | xor ax, ax |
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| 67 | stosw ; LBA WORD 3 always zero since 48-bit address |
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| 68 | mov ah, 512>>8 |
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| 69 | stosw ; Always 512-byte sectors |
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| 70 | |
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| 71 | ; Return with success |
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| 72 | xor ah, ah |
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| 73 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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| 74 | |
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| 75 | .BufferTooSmall: |
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| 76 | mov ah, RET_HD_INVALID |
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| 77 | .ReturnWithError: |
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| 78 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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