| 1 | ; Project name : XTIDE Universal BIOS
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| 2 | ; Description : Functions for creating Disk Parameter Table.
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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 | ; Creates new Disk Parameter Table for detected hard disk.
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| 9 | ; Drive is then fully accessible using any BIOS function.
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| 10 | ;
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| 11 | ; CreateDPT_FromAtaInformation
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| 12 | ; Parameters:
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| 13 | ; BH: Drive Select byte for Drive and Head Register
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| 14 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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| 15 | ; CS:BP: Ptr to IDEVARS for the controller
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| 16 | ; DS: RAMVARS segment
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| 17 | ; ES: BDA Segment
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| 18 | ; Returns:
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| 19 | ; DL: Drive number for new drive
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| 20 | ; DS:DI: Ptr to Disk Parameter Table (if successful)
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| 21 | ; CF: Cleared if DPT created successfully
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| 22 | ; Set if any error
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| 23 | ; Corrupts registers:
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| 24 | ; AX, BX, CX, DH
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| 25 | ;--------------------------------------------------------------------
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| 26 | CreateDPT_FromAtaInformation:
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| 27 | call FindDPT_ForNewDriveToDSDI
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| 28 | ; Fall to .InitializeDPT
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| 29 |
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| 30 | ;--------------------------------------------------------------------
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| 31 | ; .InitializeDPT
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| 32 | ; Parameters:
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| 33 | ; BH: Drive Select byte for Drive and Head Register
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| 34 | ; DS:DI: Ptr to Disk Parameter Table
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| 35 | ; CS:BP: Ptr to IDEVARS for the controller
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| 36 | ; Returns:
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| 37 | ; Nothing
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| 38 | ; Corrupts registers:
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| 39 | ; AX
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| 40 | ;--------------------------------------------------------------------
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| 41 | .InitializeDPT:
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| 42 | mov [di+DPT.bIdevarsOffset], bp ; IDEVARS must start in first 256 bytes of ROM
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| 43 | ; Fall to .StoreDriveSelectAndDriveControlByte
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| 44 |
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| 45 | ;--------------------------------------------------------------------
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| 46 | ; .StoreDriveSelectAndDriveControlByte
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| 47 | ; Parameters:
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| 48 | ; BH: Drive Select byte for Drive and Head Register
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| 49 | ; DS:DI: Ptr to Disk Parameter Table
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| 50 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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| 51 | ; CS:BP: Ptr to IDEVARS for the controller
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| 52 | ; Returns:
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| 53 | ; Nothing
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| 54 | ; Corrupts registers:
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| 55 | ; AX
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| 56 | ;--------------------------------------------------------------------
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| 57 | .StoreDriveSelectAndDriveControlByte:
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| 58 | mov al, bh
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| 59 | and ax, BYTE FLG_DRVNHEAD_DRV ; AL now has Master/Slave bit
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| 60 | cmp [cs:bp+IDEVARS.bIRQ], ah ; Interrupts enabled?
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| 61 | jz SHORT .StoreFlags ; If not, do not set interrupt flag
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| 62 | or al, FLGL_DPT_ENABLE_IRQ
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| 63 | .StoreFlags:
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| 64 | mov [di+DPT.wFlags], ax
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| 65 | ; Fall to .StoreAddressing
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| 66 |
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| 67 | ;--------------------------------------------------------------------
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| 68 | ; .StoreAddressing
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| 69 | ; Parameters:
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| 70 | ; DS:DI: Ptr to Disk Parameter Table
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| 71 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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| 72 | ; CS:BP: Ptr to IDEVARS for the controller
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| 73 | ; Returns:
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| 74 | ; Nothing
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| 75 | ; Corrupts registers:
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| 76 | ; AX, BX, CX, DX
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| 77 | ;--------------------------------------------------------------------
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| 78 | .StoreAddressing:
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| 79 | ; Check if CHS defined in ROMVARS
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| 80 | call AccessDPT_GetPointerToDRVPARAMStoCSBX
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| 81 | test byte [cs:bx+DRVPARAMS.wFlags], FLG_DRVPARAMS_USERCHS ; User specified CHS?
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| 82 | jnz SHORT .StoreUserDefinedPCHS
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| 83 |
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| 84 | ; Check if LBA supported
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| 85 | call AtaID_GetPCHStoAXBLBHfromAtaInfoInESSI
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| 86 | test BYTE [es:si+ATA1.wCaps+1], A1_wCaps_LBA>>8
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| 87 | jz SHORT .StoreCHSfromAXBHBL ; Small old drive with CHS addressing only
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| 88 |
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| 89 | ; Store LBA 28/48 addressing and total sector count
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| 90 | call AtaID_GetTotalSectorCountToBXDXAXfromAtaInfoInESSI
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| 91 | call StoreLbaAddressingAndTotalSectorCountFromBXDXAX
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| 92 |
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| 93 | ; Replace sector count with user defined if necessary
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| 94 | call AccessDPT_GetPointerToDRVPARAMStoCSBX
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| 95 | test BYTE [cs:bx+DRVPARAMS.wFlags], FLG_DRVPARAMS_USERLBA
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| 96 | jz SHORT .KeepTotalSectorsFromAtaID
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| 97 | mov ax, [cs:bx+DRVPARAMS.dwMaximumLBA]
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| 98 | mov dx, [cs:bx+DRVPARAMS.dwMaximumLBA+2]
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| 99 | xor bx, bx
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| 100 |
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| 101 | ; Compare user defined and ATA-ID sector count and select smaller
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| 102 | cmp bx, [di+DPT.twLbaSectors+4]
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| 103 | jb SHORT .StoreUserDefinedSectorCountToDPT
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| 104 | cmp dx, [di+DPT.twLbaSectors+2]
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| 105 | jb SHORT .StoreUserDefinedSectorCountToDPT
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| 106 | ja SHORT .KeepTotalSectorsFromAtaID
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| 107 | cmp ax, [di+DPT.twLbaSectors]
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| 108 | jae SHORT .KeepTotalSectorsFromAtaID
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| 109 | .StoreUserDefinedSectorCountToDPT:
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| 110 | call StoreLbaAddressingAndTotalSectorCountFromBXDXAX
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| 111 |
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| 112 | ; Calculate L-CHS for old INT 13h
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| 113 | .KeepTotalSectorsFromAtaID:
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| 114 | mov bx, [di+DPT.twLbaSectors+4] ; Restore BX
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| 115 | call AccessDPT_ConvertSectorCountFromBXDXAXtoLbaAssistedCHSinDXAXBLBH
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| 116 | mov [di+DPT.bLbaHeads], bl
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| 117 | jmp SHORT .StoreBlockMode
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| 118 |
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| 119 | ;--------------------------------------------------------------------
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| 120 | ; .StoreUserDefinedPCHS
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| 121 | ; Parameters:
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| 122 | ; DS:DI: Ptr to Disk Parameter Table
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| 123 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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| 124 | ; CS:BP: Ptr to IDEVARS for the controller
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| 125 | ; Returns:
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| 126 | ; AX: Number of P-CHS cylinders
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| 127 | ; BH: Number of P-CHS sectors per track
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| 128 | ; BL: Number of P-CHS heads
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| 129 | ; Corrupts registers:
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| 130 | ; Nothing
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| 131 | ;--------------------------------------------------------------------
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| 132 | .StoreUserDefinedPCHS:
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| 133 | call AccessDPT_GetPointerToDRVPARAMStoCSBX
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| 134 | mov ax, [cs:bx+DRVPARAMS.wCylinders]
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| 135 | mov bx, [cs:bx+DRVPARAMS.wHeadsAndSectors]
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| 136 | ; Fall to .StoreCHSfromAXBHBL
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| 137 |
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| 138 | ;--------------------------------------------------------------------
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| 139 | ; .StoreCHSfromAXBHBL
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| 140 | ; Parameters:
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| 141 | ; AX: Number of P-CHS cylinders
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| 142 | ; BH: Number of P-CHS sectors per track
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| 143 | ; BL: Number of P-CHS heads
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| 144 | ; DS:DI: Ptr to Disk Parameter Table
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| 145 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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| 146 | ; CS:BP: Ptr to IDEVARS for the controller
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| 147 | ; Returns:
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| 148 | ; AX: Number of P-CHS cylinders
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| 149 | ; BH: Number of P-CHS sectors per track
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| 150 | ; BL: Number of P-CHS heads
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| 151 | ; Corrupts registers:
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| 152 | ; CX
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| 153 | ;--------------------------------------------------------------------
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| 154 | .StoreCHSfromAXBHBL:
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| 155 | push ax
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| 156 | push bx
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| 157 | call AccessDPT_ShiftPCHinAXBLtoLCH ; Get number of bits to shift
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| 158 | pop bx
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| 159 | pop ax
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| 160 | jcxz .StorePCHSfromAXDX ; Small drive so use L-CHS addressing
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| 161 |
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| 162 | ; Store P-CHS addressing mode and number of bits to shift in L-CHS to P-CHS translation
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| 163 | or cl, ADDRESSING_MODE_PCHS<<ADDRESSING_MODE_FIELD_POSITION
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| 164 | or [di+DPT.bFlagsLow], cl
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| 165 | ; Fall to .StoreChsFromAXBLBH
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| 166 |
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| 167 | ;--------------------------------------------------------------------
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| 168 | ; .StoreChsFromAXBLBH
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| 169 | ; Parameters:
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| 170 | ; AX: Number of P-CHS cylinders
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| 171 | ; BH: Number of P-CHS sectors per track
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| 172 | ; BL: Number of P-CHS heads
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| 173 | ; DS:DI: Ptr to Disk Parameter Table
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| 174 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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| 175 | ; CS:BP: Ptr to IDEVARS for the controller
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| 176 | ; Returns:
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| 177 | ; Nothing
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| 178 | ; Corrupts registers:
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| 179 | ; Nothing
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| 180 | ;--------------------------------------------------------------------
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| 181 | .StorePCHSfromAXDX:
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| 182 | mov [di+DPT.wPchsCylinders], ax
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| 183 | mov [di+DPT.wPchsHeadsAndSectors], bx
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| 184 | ; Fall to .StoreBlockMode
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| 185 |
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| 186 | ;--------------------------------------------------------------------
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| 187 | ; .StoreBlockMode
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| 188 | ; Parameters:
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| 189 | ; DS:DI: Ptr to Disk Parameter Table
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| 190 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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| 191 | ; CS:BP: Ptr to IDEVARS for the controller
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| 192 | ; Returns:
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| 193 | ; Nothing
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| 194 | ; Corrupts registers:
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| 195 | ; Nothing
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| 196 | ;--------------------------------------------------------------------
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| 197 | .StoreBlockMode:
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| 198 | cmp BYTE [es:si+ATA1.bBlckSize], 1 ; Max block size in sectors
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| 199 | jbe SHORT .BlockModeTransfersNotSupported
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| 200 | or BYTE [di+DPT.bFlagsHigh], FLGH_DPT_BLOCK_MODE_SUPPORTED
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| 201 | .BlockModeTransfersNotSupported:
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| 202 | ; Fall to .StoreDeviceSpecificParameters
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| 203 |
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| 204 | ;--------------------------------------------------------------------
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| 205 | ; .StoreDeviceSpecificParameters
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| 206 | ; Parameters:
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| 207 | ; DS:DI: Ptr to Disk Parameter Table
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| 208 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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| 209 | ; CS:BP: Ptr to IDEVARS for the controller
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| 210 | ; Returns:
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| 211 | ; Nothing
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| 212 | ; Corrupts registers:
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| 213 | ; AX, BX, CX, DX
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| 214 | ;--------------------------------------------------------------------
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| 215 | .StoreDeviceSpecificParameters:
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| 216 | call Device_FinalizeDPT
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| 217 |
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| 218 | ;----------------------------------------------------------------------
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| 219 | ; Update drive counts (hard and floppy)
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| 220 | ;----------------------------------------------------------------------
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| 221 |
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| 222 | %ifdef MODULE_SERIAL_FLOPPY
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| 223 | ;
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| 224 | ; These two instructions serve two purposes:
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| 225 | ; 1. If the drive is a floppy drive (CF set), then we effectively increment the counter.
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| 226 | ; 2. If this is a hard disk, and there have been any floppy drives previously added, then the hard disk is
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| 227 | ; effectively discarded. This is more of a safety check then code that should ever normally be hit (see below).
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| 228 | ; Since the floppy DPT's come after the hard disk DPT's, without expensive (code size) code to relocate a DPT,
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| 229 | ; this was necessary. Now, this situation shouldn't happen in normal operation, for a couple of reasons:
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| 230 | ; A. xtidecfg always puts configured serial ports at the end of the IDEVARS list
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| 231 | ; B. the auto serial code is always executed last
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| 232 | ; C. the serial server always returns floppy drives last
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| 233 | ;
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| 234 | adc byte [RAMVARS.xlateVars+XLATEVARS.bFlopCreateCnt], 0
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| 235 | jnz .AllDone
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| 236 | %else
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| 237 | ;
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| 238 | ; Even without floppy support enabled, we shouldn't try to mount a floppy image as a hard disk, which
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| 239 | ; could lead to unpredictable results since no MBR will be present, etc. The server doesn't know that
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| 240 | ; floppies are supported, so it is important to still fail here if a floppy is seen during the drive scan.
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| 241 | ;
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| 242 | jc .AllDone
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| 243 | %endif
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| 244 |
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| 245 | inc BYTE [RAMVARS.bDrvCnt] ; Increment drive count to RAMVARS
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| 246 |
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| 247 | .AllDone:
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| 248 | clc
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| 249 | ret
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| 250 |
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| 251 |
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| 252 | ;--------------------------------------------------------------------
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| 253 | ; StoreLbaAddressingAndTotalSectorCountFromBXDXAX
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| 254 | ; Parameters:
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| 255 | ; BX:DX:AX: Total Sector Count
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| 256 | ; DS:DI: Ptr to Disk Parameter Table
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| 257 | ; Returns:
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| 258 | ; Nothing
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| 259 | ; Corrupts registers:
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| 260 | ; CX
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| 261 | ;--------------------------------------------------------------------
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| 262 | StoreLbaAddressingAndTotalSectorCountFromBXDXAX:
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| 263 | mov [di+DPT.twLbaSectors], ax
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| 264 | mov [di+DPT.twLbaSectors+2], dx
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| 265 | mov [di+DPT.twLbaSectors+4], bx
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| 266 |
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| 267 | and BYTE [di+DPT.bFlagsLow], ~MASKL_DPT_ADDRESSING_MODE
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| 268 | test bx, bx
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| 269 | jnz SHORT .SetLba48AddressingToDPT ; Must be LBA48
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| 270 |
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| 271 | ; Drives can report at most 0FFF FFFFh LBA28 sectors according to ATA specification.
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| 272 | ; That is (2^28)-1 so we can simply check if DH is zero or not.
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| 273 | test dh, dh
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| 274 | jz SHORT .SetLba28AddressingToDPT
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| 275 | .SetLba48AddressingToDPT:
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| 276 | or BYTE [di+DPT.bFlagsLow], ADDRESSING_MODE_LBA48<<ADDRESSING_MODE_FIELD_POSITION
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| 277 | .SetLba28AddressingToDPT:
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| 278 | or BYTE [di+DPT.bFlagsLow], ADDRESSING_MODE_LBA28<<ADDRESSING_MODE_FIELD_POSITION
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| 279 | ret
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