| 1 | ; File name : CreateDPT.asm
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| 2 | ; Project name : IDE BIOS
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| 3 | ; Created date : 12.3.2010
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| 4 | ; Last update : 26.4.2010
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| 5 | ; Author : Tomi Tilli
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| 6 | ; Description : Functions for creating Disk Parameter Table.
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| 7 |
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| 8 | ; Section containing code
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| 9 | SECTION .text
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| 10 |
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| 11 | ;--------------------------------------------------------------------
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| 12 | ; Creates new Disk Parameter Table for detected hard disk.
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| 13 | ; Drive is then fully accessible using any BIOS function.
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| 14 | ;
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| 15 | ; CreateDPT_FromAtaInformation
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| 16 | ; Parameters:
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| 17 | ; BH: Drive Select byte for Drive and Head Register
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| 18 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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| 19 | ; CS:BP: Ptr to IDEVARS for the controller
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| 20 | ; DS: RAMVARS segment
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| 21 | ; ES: BDA Segment
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| 22 | ; Returns:
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| 23 | ; DL: Drive number for new drive
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| 24 | ; DS:DI: Ptr to Disk Parameter Table (if succesfull)
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| 25 | ; CF: Cleared if DPT created successfully
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| 26 | ; Set if any error
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| 27 | ; Corrupts registers:
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| 28 | ; AX, CX, BX, DH
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| 29 | ;--------------------------------------------------------------------
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| 30 | ALIGN JUMP_ALIGN
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| 31 | CreateDPT_FromAtaInformation:
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| 32 | call FindDPT_ForNewDrive ; Get new DPT to DS:DI
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| 33 | call CreateDPT_Initialize
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| 34 | call CreateDPT_StoreDriveControlByte
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| 35 | call CreateDPT_StorePCHS
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| 36 | call CreateDPT_StoreLCHS
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| 37 | call CreateDPT_StoreAddressing
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| 38 | call CreateDPT_StoreBlockMode
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| 39 | call CreateDPT_StoreEBIOSSupport
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| 40 | jmp CreateDPT_StoreDriveNumberAndUpdateDriveCount
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| 41 |
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| 42 |
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| 43 | ;--------------------------------------------------------------------
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| 44 | ; Initializes empty DPT by storing initial values that are not
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| 45 | ; read from ATA information.
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| 46 | ;
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| 47 | ; CreateDPT_Initialize
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| 48 | ; Parameters:
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| 49 | ; BH: Drive Select byte for Drive and Head Register
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| 50 | ; DS:DI: Ptr to Disk Parameter Table
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| 51 | ; CS:BP: Ptr to IDEVARS for the controller
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| 52 | ; Returns:
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| 53 | ; CF: Cleared if DPT parameters stored successfully
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| 54 | ; Set if any error
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| 55 | ; Corrupts registers:
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| 56 | ; Nothing
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| 57 | ;--------------------------------------------------------------------
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| 58 | ALIGN JUMP_ALIGN
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| 59 | CreateDPT_Initialize:
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| 60 | xor ax, ax ; Clear AX and CF
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| 61 | mov BYTE [di+DPT.bSize], DPT_size
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| 62 | mov BYTE [di+DPT.bDrvNum], al
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| 63 | mov BYTE [di+DPT.bFlags], al
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| 64 | mov BYTE [di+DPT.bReset], MASK_RESET_ALL
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| 65 | mov WORD [di+DPT.bIdeOff], bp
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| 66 | mov BYTE [di+DPT.bDrvSel], bh
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| 67 | ret
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| 68 |
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| 69 |
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| 70 | ;--------------------------------------------------------------------
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| 71 | ; Stores Drive Control Byte for Device Control Register.
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| 72 | ;
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| 73 | ; CreateDPT_StoreDriveControlByte
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| 74 | ; Parameters:
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| 75 | ; BH: Drive Select byte for Drive and Head Register
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| 76 | ; DS:DI: Ptr to Disk Parameter Table
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| 77 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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| 78 | ; CS:BP: Ptr to IDEVARS for the controller
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| 79 | ; Returns:
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| 80 | ; CF: Cleared if DPT parameters stored successfully
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| 81 | ; Set if any error
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| 82 | ; Corrupts registers:
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| 83 | ; AX
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| 84 | ;--------------------------------------------------------------------
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| 85 | ALIGN JUMP_ALIGN
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| 86 | CreateDPT_StoreDriveControlByte:
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| 87 | xor ax, ax ; Zero AX
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| 88 | cmp BYTE [cs:bp+IDEVARS.bIRQ], 0 ; Interrupts enabled?
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| 89 | jne SHORT .CheckHeadCount
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| 90 | or al, FLG_IDE_CTRL_nIEN ; Disable interrupts
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| 91 | ALIGN JUMP_ALIGN
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| 92 | .CheckHeadCount:
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| 93 | cmp BYTE [es:si+ATA1.wHeadCnt], 8 ; 1...8 heads?
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| 94 | jbe SHORT .StoreDriveControlByte
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| 95 | or al, FLG_IDE_CTRL_O8H ; Over 8 heads (pre-ATA)
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| 96 | ALIGN JUMP_ALIGN
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| 97 | .StoreDriveControlByte:
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| 98 | mov [di+DPT.bDrvCtrl], al
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| 99 | clc
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| 100 | ret
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| 101 |
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| 102 |
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| 103 | ;--------------------------------------------------------------------
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| 104 | ; Stores P-CHS values from ATA information or user specified values to DPT.
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| 105 | ;
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| 106 | ; CreateDPT_StorePCHS
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| 107 | ; Parameters:
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| 108 | ; BH: Drive Select byte for Drive and Head Register
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| 109 | ; DS:DI: Ptr to Disk Parameter Table
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| 110 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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| 111 | ; CS:BP: Ptr to IDEVARS for the controller
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| 112 | ; Returns:
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| 113 | ; CF: Cleared if DPT parameters stored successfully
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| 114 | ; Set if any error
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| 115 | ; Corrupts registers:
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| 116 | ; AX, BX
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| 117 | ;--------------------------------------------------------------------
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| 118 | ALIGN JUMP_ALIGN
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| 119 | CreateDPT_StorePCHS:
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| 120 | call CreateDPT_GetUserOrAtaPCHS
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| 121 | mov [di+DPT.wPCyls], ax
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| 122 | mov [di+DPT.bPHeads], bh
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| 123 | mov [di+DPT.bPSect], bl
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| 124 | clc
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| 125 | ret
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| 126 |
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| 127 | ;--------------------------------------------------------------------
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| 128 | ; Returns user specified P-CHS or values read from ATA information.
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| 129 | ;
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| 130 | ; CreateDPT_GetUserOrAtaPCHS
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| 131 | ; Parameters:
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| 132 | ; BH: Drive Select byte for Drive and Head Register
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| 133 | ; DS:DI: Ptr to Disk Parameter Table
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| 134 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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| 135 | ; CS:BP: Ptr to IDEVARS for the controller
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| 136 | ; Returns:
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| 137 | ; AX: Number of P-CHS cylinders
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| 138 | ; BL: Number of P-CHS sectors per track
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| 139 | ; BH: Number of P-CHS heads
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| 140 | ; Corrupts registers:
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| 141 | ; Nothing
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| 142 | ;--------------------------------------------------------------------
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| 143 | ALIGN JUMP_ALIGN
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| 144 | CreateDPT_GetUserOrAtaPCHS:
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| 145 | mov ax, FLG_DRVPARAMS_USERCHS ; User specified CHS?
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| 146 | call AccessDPT_TestIdeVarsFlagsForMasterOrSlaveDrive
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| 147 | jnz SHORT CreateDPT_GetUserSpecifiedPCHS
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| 148 | jmp AtaID_GetPCHS
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| 149 |
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| 150 | ;--------------------------------------------------------------------
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| 151 | ; Returns user specified P-CHS values from ROMVARS.
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| 152 | ;
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| 153 | ; CreateDPT_GetUserSpecifiedPCHS
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| 154 | ; Parameters:
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| 155 | ; DS:DI: Ptr to Disk Parameter Table
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| 156 | ; CS:BP: Ptr to IDEVARS for the controller
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| 157 | ; Returns:
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| 158 | ; AX: Number of user specified P-CHS cylinders
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| 159 | ; BL: Number of user specified P-CHS sectors per track
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| 160 | ; BH: Number of user specified P-CHS heads
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| 161 | ; Corrupts registers:
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| 162 | ; Nothing
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| 163 | ;--------------------------------------------------------------------
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| 164 | ALIGN JUMP_ALIGN
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| 165 | CreateDPT_GetUserSpecifiedPCHS:
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| 166 | call AccessDPT_GetPointerToDRVPARAMStoCSBX
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| 167 | mov ax, [cs:bx+DRVPARAMS.wCylinders]
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| 168 | mov bx, [cs:bx+DRVPARAMS.wSectAndHeads]
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| 169 | or BYTE [di+DPT.bFlags], FLG_DPT_USERCHS
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| 170 | ret
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| 171 |
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| 172 |
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| 173 | ;--------------------------------------------------------------------
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| 174 | ; Stores L-CHS values by converting from P-CHS values if necessary.
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| 175 | ;
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| 176 | ; CreateDPT_StoreLCHS
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| 177 | ; Parameters:
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| 178 | ; DS:DI: Ptr to Disk Parameter Table
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| 179 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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| 180 | ; Returns:
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| 181 | ; CF: Cleared if DPT parameters stored successfully
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| 182 | ; Set if any error
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| 183 | ; Corrupts registers:
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| 184 | ; AX, CX, DX
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| 185 | ;--------------------------------------------------------------------
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| 186 | ALIGN JUMP_ALIGN
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| 187 | CreateDPT_StoreLCHS:
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| 188 | mov cx, [di+DPT.wPCyls] ; P-CHS Cylinders (1...16383)
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| 189 | eMOVZX dx, BYTE [di+DPT.bPHeads] ; P-CHS Heads (1...16)
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| 190 | call CreateDPT_ShiftPCHtoLCH
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| 191 | test dh, dh ; 256 heads?
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| 192 | jz SHORT .StoreToDPT ; If less, no correction needed
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| 193 | dec dx ; Limit to 255 heads since DOS does not support 256 heads
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| 194 | ALIGN JUMP_ALIGN
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| 195 | .StoreToDPT:
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| 196 | mov [di+DPT.bShLtoP], al
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| 197 | mov [di+DPT.wLHeads], dx
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| 198 | clc
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| 199 | ret
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| 200 |
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| 201 | ;--------------------------------------------------------------------
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| 202 | ; Returns L-CHS values from P-CHS values.
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| 203 | ; Sectors per track is always the same for both addressing modes.
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| 204 | ;
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| 205 | ; CreateDPT_ShiftPCHtoLCH:
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| 206 | ; Parameters:
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| 207 | ; CX: Number of P-CHS cylinders (1...16383)
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| 208 | ; DX: Number of P-CHS heads (1...16)
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| 209 | ; Returns:
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| 210 | ; AL: Number of bits shifted
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| 211 | ; CX: Number of L-CHS cylinders (1...1024)
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| 212 | ; DX: Number of L-CHS heads (1...256)
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| 213 | ; Corrupts registers:
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| 214 | ; Nothing
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| 215 | ;--------------------------------------------------------------------
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| 216 | ALIGN JUMP_ALIGN
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| 217 | CreateDPT_ShiftPCHtoLCH:
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| 218 | xor al, al ; Zero AL
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| 219 | ALIGN JUMP_ALIGN
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| 220 | .ShiftLoop:
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| 221 | cmp cx, 1024 ; Need to shift?
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| 222 | jbe SHORT .Return ; If not, return
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| 223 | inc ax ; Increment shift count
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| 224 | shr cx, 1 ; Halve cylinders
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| 225 | shl dx, 1 ; Double heads
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| 226 | jmp SHORT .ShiftLoop
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| 227 | ALIGN JUMP_ALIGN
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| 228 | .Return:
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| 229 | ret
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| 230 |
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| 231 |
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| 232 | ;--------------------------------------------------------------------
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| 233 | ; Stores addressing information (L-CHS, P-CHS, LBA28 or LBA48).
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| 234 | ;
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| 235 | ; CreateDPT_StoreAddressing
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| 236 | ; Parameters:
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| 237 | ; DS:DI: Ptr to Disk Parameter Table
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| 238 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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| 239 | ; Returns:
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| 240 | ; CF: Cleared if DPT parameters stored successfully
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| 241 | ; Set if any error
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| 242 | ; Corrupts registers:
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| 243 | ; Nothing
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| 244 | ;--------------------------------------------------------------------
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| 245 | ALIGN JUMP_ALIGN
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| 246 | CreateDPT_StoreAddressing:
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| 247 | cmp WORD [di+DPT.wPCyls], 1024 ; L-CHS possible? (no translation needed)
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| 248 | jbe SHORT .Return ; If so, nothing needs to be changed
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| 249 | test BYTE [di+DPT.bFlags], FLG_DPT_USERCHS
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| 250 | jnz SHORT .StorePCHS ; Use user defined P-CHS
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| 251 | test WORD [es:si+ATA1.wCaps], A2_wCaps_LBA
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| 252 | jz SHORT .StorePCHS ; Use P-CHS since LBA not supported
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| 253 | test WORD [es:si+ATA6.wSetSup83], A6_wSetSup83_LBA48
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| 254 | jz SHORT .StoreLBA28 ; Use LBA-28 since LBA-48 not supported
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| 255 | or BYTE [di+DPT.bFlags], ADDR_DPT_LBA48<<1
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| 256 | ALIGN JUMP_ALIGN
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| 257 | .StoreLBA28:
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| 258 | or BYTE [di+DPT.bFlags], ADDR_DPT_LBA28<<1
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| 259 | or BYTE [di+DPT.bDrvSel], FLG_IDE_DRVHD_LBA
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| 260 | ret
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| 261 | ALIGN JUMP_ALIGN
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| 262 | .StorePCHS:
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| 263 | or BYTE [di+DPT.bFlags], ADDR_DPT_PCHS<<1
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| 264 | ALIGN JUMP_ALIGN
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| 265 | .Return:
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| 266 | clc
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| 267 | ret
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| 268 |
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| 269 |
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| 270 | ;--------------------------------------------------------------------
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| 271 | ; Stores Block Mode information.
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| 272 | ;
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| 273 | ; CreateDPT_StoreBlockMode
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| 274 | ; Parameters:
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| 275 | ; DS:DI: Ptr to Disk Parameter Table
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| 276 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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| 277 | ; Returns:
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| 278 | ; CF: Cleared if DPT parameters stored successfully
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| 279 | ; Set if any error
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| 280 | ; Corrupts registers:
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| 281 | ; Nothing
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| 282 | ;--------------------------------------------------------------------
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| 283 | ALIGN JUMP_ALIGN
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| 284 | CreateDPT_StoreBlockMode:
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| 285 | mov al, 1 ; Minimum block size is 1 sector
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| 286 | mov ah, [es:si+ATA1.bBlckSize] ; Load max block size in sectors
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| 287 | mov [di+DPT.wSetAndMaxBlock], ax
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| 288 | ret
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| 289 |
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| 290 |
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| 291 | ;--------------------------------------------------------------------
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| 292 | ; Stores variables required by EBIOS functions.
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| 293 | ;
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| 294 | ; CreateDPT_StoreEBIOSSupport
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| 295 | ; Parameters:
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| 296 | ; DS:DI: Ptr to Disk Parameter Table
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| 297 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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| 298 | ; Returns:
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| 299 | ; CF: Cleared if DPT parameters stored successfully
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| 300 | ; Set if any error
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| 301 | ; Corrupts registers:
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| 302 | ; AX, BX, DX
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| 303 | ;--------------------------------------------------------------------
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| 304 | ALIGN JUMP_ALIGN
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| 305 | CreateDPT_StoreEBIOSSupport:
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| 306 | test BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_FULLMODE ; (clears CF)
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| 307 | jz SHORT .DoNotSupportEBIOS ; No EBIOS support since small DPTs needed
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| 308 | mov bl, [di+DPT.bFlags]
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| 309 | and bx, BYTE MASK_DPT_ADDR ; Addressing mode (clears CF)
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| 310 | jmp [cs:bx+.rgwAddrJmp] ; Jump to handle addressing mode
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| 311 | ALIGN WORD_ALIGN
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| 312 | .rgwAddrJmp:
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| 313 | dw .DoNotSupportEBIOS ; ADDR_DPT_LCHS
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| 314 | dw .DoNotSupportEBIOS ; ADDR_DPT_PCHS
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| 315 | dw .SupportForLBA28 ; ADDR_DPT_LBA28
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| 316 | dw .SupportForLBA48 ; ADDR_DPT_LBA48
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| 317 | ALIGN JUMP_ALIGN
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| 318 | .DoNotSupportEBIOS:
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| 319 | ret
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| 320 | ALIGN JUMP_ALIGN
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| 321 | .SupportForLBA28:
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| 322 | sub BYTE [di+DPT.bSize], 2 ; Only 4 bytes for sector count
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| 323 | ALIGN JUMP_ALIGN
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| 324 | .SupportForLBA48:
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| 325 | add BYTE [di+DPT.bSize], EBDPT_size - DPT_size
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| 326 | or BYTE [di+DPT.bFlags], FLG_DPT_EBIOS
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| 327 | ; Fall to CreateDPT_StoreEbiosSectorCount
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| 328 |
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| 329 | ;--------------------------------------------------------------------
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| 330 | ; Stores EBIOS total sector count for LBA addressing.
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| 331 | ;
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| 332 | ; CreateDPT_StoreEbiosSectorCount
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| 333 | ; Parameters:
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| 334 | ; DS:DI: Ptr to Disk Parameter Table
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| 335 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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| 336 | ; Returns:
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| 337 | ; CF: Cleared if DPT parameters stored successfully
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| 338 | ; Set if any error
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| 339 | ; Corrupts registers:
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| 340 | ; AX, BX, DX
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| 341 | ;--------------------------------------------------------------------
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| 342 | ;ALIGN JUMP_ALIGN
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| 343 | CreateDPT_StoreEbiosSectorCount:
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| 344 | call AtaID_GetTotalSectorCount
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| 345 | mov [di+EBDPT.twCapacity], ax
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| 346 | mov [di+EBDPT.twCapacity+2], dx
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| 347 | mov [di+EBDPT.twCapacity+4], bx
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| 348 | clc
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| 349 | ret
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| 350 |
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| 351 |
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| 352 | ;--------------------------------------------------------------------
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| 353 | ; Stores number for drive and updates drive count.
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| 354 | ;
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| 355 | ; CreateDPT_StoreDriveNumberAndUpdateDriveCount
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| 356 | ; Parameters:
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| 357 | ; DS:DI: Ptr to Disk Parameter Table
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| 358 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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| 359 | ; ES: BDA Segment
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| 360 | ; Returns:
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| 361 | ; DL: Drive number for new drive
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| 362 | ; CF: Cleared if DPT parameters stored successfully
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| 363 | ; Set if any error
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| 364 | ; Corrupts registers:
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| 365 | ; Nothing
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| 366 | ;--------------------------------------------------------------------
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| 367 | ALIGN JUMP_ALIGN
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| 368 | CreateDPT_StoreDriveNumberAndUpdateDriveCount:
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| 369 | ; Make sure that more drives can be accepted
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| 370 | mov dl, [es:BDA.bHDCount] ; Load number of hard disks
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| 371 | test dl, 80h ; Hard disks at maximum?
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| 372 | stc ; Assume error
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| 373 | jnz SHORT .TooManyDrives ; If so, return
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| 374 |
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| 375 | ; Store drive number to DPT
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| 376 | or dl, 80h ; Set bit 7 since hard disk
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| 377 | mov [di+DPT.bDrvNum], dl ; Store drive number
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| 378 |
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| 379 | ; Update BDA and RAMVARS
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| 380 | inc BYTE [es:BDA.bHDCount] ; Increment drive count to BDA
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| 381 | call RamVars_IncrementHardDiskCount
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| 382 | clc
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| 383 | .TooManyDrives:
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| 384 | ret
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