| 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 ATA Drive Information and total sector count from it
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| 26 | push ds
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| 27 | pop es ; ES now points RAMVARS segment
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| 28 | mov si, [cs:ROMVARS.bStealSize]
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| 29 | and si, BYTE 7Fh
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| 30 | eSHL_IM si, 10 ; Kilobytes to bytes
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| 31 | sub si, 512 ; Subtract buffer size for offset in RAMVARS
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| 32 | call AH25h_GetDriveInformationToBufferInESSIfromDriveInDL
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| 33 | call AtaID_GetTotalSectorCountToBXDXAXfromAtaInfoInESSI
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| 34 | xchg cx, ax
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| 35 |
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| 36 | ; Point ES:DI to Destination buffer
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| 37 | mov di, [bp+IDEPACK.intpack+INTPACK.si]
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| 38 | mov es, [bp+IDEPACK.intpack+INTPACK.ds]
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| 39 | cmp WORD [es:di+EDRIVE_INFO.wSize], MINIMUM_EDRIVEINFO_SIZE
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| 40 | jb SHORT .BufferTooSmall
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| 41 |
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| 42 | ; Fill Extended Drive Information Table in ES:DI
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| 43 | mov ax, MINIMUM_EDRIVEINFO_SIZE
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| 44 | stosw
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| 45 | mov al, FLG_DMA_BOUNDARY_ERRORS_HANDLED_BY_BIOS
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| 46 | stosw
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| 47 | add di, BYTE 12 ; Skip CHS parameters
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| 48 | xchg ax, cx
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| 49 | stosw ; LBA WORD 0
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| 50 | xchg ax, dx
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| 51 | stosw ; LBA WORD 1
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| 52 | xchg ax, bx
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| 53 | stosw ; LBA WORD 2
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| 54 | xor ax, ax
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| 55 | stosw ; LBA WORD 3 always zero since 48-bit address
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| 56 | mov ah, 512>>8
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| 57 | stosw ; Always 512-byte sectors
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| 58 |
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| 59 | ; Return with success
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| 60 | xor ah, ah
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| 61 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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| 62 |
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| 63 | .BufferTooSmall:
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| 64 | mov ah, RET_HD_INVALID
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| 65 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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