| 1 | ; Project name : XTIDE Universal BIOS
|
|---|
| 2 | ; Description : Functions for creating Disk Parameter Table.
|
|---|
| 3 |
|
|---|
| 4 | ; Section containing code
|
|---|
| 5 | SECTION .text
|
|---|
| 6 |
|
|---|
| 7 | ;--------------------------------------------------------------------
|
|---|
| 8 | ; Creates new Disk Parameter Table for detected hard disk.
|
|---|
| 9 | ; Drive is then fully accessible using any BIOS function.
|
|---|
| 10 | ;
|
|---|
| 11 | ; CreateDPT_FromAtaInformation
|
|---|
| 12 | ; Parameters:
|
|---|
| 13 | ; BH: Drive Select byte for Drive and Head Register
|
|---|
| 14 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
|
|---|
| 15 | ; CS:BP: Ptr to IDEVARS for the controller
|
|---|
| 16 | ; DS: RAMVARS segment
|
|---|
| 17 | ; ES: BDA Segment
|
|---|
| 18 | ; Returns:
|
|---|
| 19 | ; DL: Drive number for new drive
|
|---|
| 20 | ; DS:DI: Ptr to Disk Parameter Table (if successful)
|
|---|
| 21 | ; CF: Cleared if DPT created successfully
|
|---|
| 22 | ; Set if any error
|
|---|
| 23 | ; Corrupts registers:
|
|---|
| 24 | ; AX, BX, CX, DH
|
|---|
| 25 | ;--------------------------------------------------------------------
|
|---|
| 26 | CreateDPT_FromAtaInformation:
|
|---|
| 27 | call FindDPT_ForNewDriveToDSDI
|
|---|
| 28 | ; Fall to .InitializeDPT
|
|---|
| 29 |
|
|---|
| 30 | ;--------------------------------------------------------------------
|
|---|
| 31 | ; .InitializeDPT
|
|---|
| 32 | ; Parameters:
|
|---|
| 33 | ; BH: Drive Select byte for Drive and Head Register
|
|---|
| 34 | ; DS:DI: Ptr to Disk Parameter Table
|
|---|
| 35 | ; CS:BP: Ptr to IDEVARS for the controller
|
|---|
| 36 | ; Returns:
|
|---|
| 37 | ; Nothing
|
|---|
| 38 | ; Corrupts registers:
|
|---|
| 39 | ; AX
|
|---|
| 40 | ;--------------------------------------------------------------------
|
|---|
| 41 | .InitializeDPT:
|
|---|
| 42 | mov [di+DPT.bIdevarsOffset], bp ; IDEVARS must start in first 256 bytes of ROM
|
|---|
| 43 | ; Fall to .StoreDriveSelectAndDriveControlByte
|
|---|
| 44 |
|
|---|
| 45 | ;--------------------------------------------------------------------
|
|---|
| 46 | ; .StoreDriveSelectAndDriveControlByte
|
|---|
| 47 | ; Parameters:
|
|---|
| 48 | ; BH: Drive Select byte for Drive and Head Register
|
|---|
| 49 | ; DS:DI: Ptr to Disk Parameter Table
|
|---|
| 50 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
|
|---|
| 51 | ; CS:BP: Ptr to IDEVARS for the controller
|
|---|
| 52 | ; Returns:
|
|---|
| 53 | ; Nothing
|
|---|
| 54 | ; Corrupts registers:
|
|---|
| 55 | ; AX
|
|---|
| 56 | ;--------------------------------------------------------------------
|
|---|
| 57 | .StoreDriveSelectAndDriveControlByte:
|
|---|
| 58 | mov al, bh
|
|---|
| 59 | and ax, BYTE FLG_DRVNHEAD_DRV ; AL now has Master/Slave bit
|
|---|
| 60 | cmp [cs:bp+IDEVARS.bIRQ], ah ; Interrupts enabled?
|
|---|
| 61 | jz SHORT .StoreFlags ; If not, do not set interrupt flag
|
|---|
| 62 | or al, FLGL_DPT_ENABLE_IRQ
|
|---|
| 63 | .StoreFlags:
|
|---|
| 64 | mov [di+DPT.wFlags], ax
|
|---|
| 65 | ; Fall to .StoreAddressing
|
|---|
| 66 |
|
|---|
| 67 | ;--------------------------------------------------------------------
|
|---|
| 68 | ; .StoreAddressing
|
|---|
| 69 | ; Parameters:
|
|---|
| 70 | ; DS:DI: Ptr to Disk Parameter Table
|
|---|
| 71 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
|
|---|
| 72 | ; CS:BP: Ptr to IDEVARS for the controller
|
|---|
| 73 | ; Returns:
|
|---|
| 74 | ; Nothing
|
|---|
| 75 | ; Corrupts registers:
|
|---|
| 76 | ; AX, BX, CX, DX
|
|---|
| 77 | ;--------------------------------------------------------------------
|
|---|
| 78 | .StoreAddressing:
|
|---|
| 79 | ; Check if CHS defined in ROMVARS
|
|---|
| 80 | call AccessDPT_GetPointerToDRVPARAMStoCSBX
|
|---|
| 81 | test byte [cs:bx+DRVPARAMS.wFlags], FLG_DRVPARAMS_USERCHS ; User specified CHS?
|
|---|
| 82 | jnz SHORT .StoreUserDefinedPCHS
|
|---|
| 83 |
|
|---|
| 84 | ; Check if LBA supported
|
|---|
| 85 | call AtaID_GetPCHStoAXBLBHfromAtaInfoInESSI
|
|---|
| 86 | test BYTE [es:si+ATA1.wCaps+1], A1_wCaps_LBA>>8
|
|---|
| 87 | jz SHORT .StoreCHSfromAXBHBL ; Small old drive with CHS addressing only
|
|---|
| 88 |
|
|---|
| 89 | ; Store LBA 28/48 addressing and total sector count
|
|---|
| 90 | call AtaID_GetTotalSectorCountToBXDXAXfromAtaInfoInESSI
|
|---|
| 91 | call StoreLbaAddressingAndTotalSectorCountFromBXDXAX
|
|---|
| 92 |
|
|---|
| 93 | ; Replace sector count with user defined if necessary
|
|---|
| 94 | call AccessDPT_GetPointerToDRVPARAMStoCSBX
|
|---|
| 95 | test BYTE [cs:bx+DRVPARAMS.wFlags], FLG_DRVPARAMS_USERLBA
|
|---|
| 96 | jz SHORT .KeepTotalSectorsFromAtaID
|
|---|
| 97 | mov ax, [cs:bx+DRVPARAMS.dwMaximumLBA]
|
|---|
| 98 | mov dx, [cs:bx+DRVPARAMS.dwMaximumLBA+2]
|
|---|
| 99 | xor bx, bx
|
|---|
| 100 |
|
|---|
| 101 | ; Compare user defined and ATA-ID sector count and select smaller
|
|---|
| 102 | cmp bx, [di+DPT.twLbaSectors+4]
|
|---|
| 103 | jb SHORT .StoreUserDefinedSectorCountToDPT
|
|---|
| 104 | cmp dx, [di+DPT.twLbaSectors+2]
|
|---|
| 105 | jb SHORT .StoreUserDefinedSectorCountToDPT
|
|---|
| 106 | ja SHORT .KeepTotalSectorsFromAtaID
|
|---|
| 107 | cmp ax, [di+DPT.twLbaSectors]
|
|---|
| 108 | jae SHORT .KeepTotalSectorsFromAtaID
|
|---|
| 109 | .StoreUserDefinedSectorCountToDPT:
|
|---|
| 110 | call StoreLbaAddressingAndTotalSectorCountFromBXDXAX
|
|---|
| 111 |
|
|---|
| 112 | ; Calculate L-CHS for old INT 13h
|
|---|
| 113 | .KeepTotalSectorsFromAtaID:
|
|---|
| 114 | mov bx, [di+DPT.twLbaSectors+4] ; Restore BX
|
|---|
| 115 | call AccessDPT_ConvertSectorCountFromBXDXAXtoLbaAssistedCHSinDXAXBLBH
|
|---|
| 116 | mov [di+DPT.bLbaHeads], bl
|
|---|
| 117 | jmp SHORT .StoreBlockMode
|
|---|
| 118 |
|
|---|
| 119 | ;--------------------------------------------------------------------
|
|---|
| 120 | ; .StoreUserDefinedPCHS
|
|---|
| 121 | ; Parameters:
|
|---|
| 122 | ; DS:DI: Ptr to Disk Parameter Table
|
|---|
| 123 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
|
|---|
| 124 | ; CS:BP: Ptr to IDEVARS for the controller
|
|---|
| 125 | ; Returns:
|
|---|
| 126 | ; AX: Number of P-CHS cylinders
|
|---|
| 127 | ; BH: Number of P-CHS sectors per track
|
|---|
| 128 | ; BL: Number of P-CHS heads
|
|---|
| 129 | ; Corrupts registers:
|
|---|
| 130 | ; Nothing
|
|---|
| 131 | ;--------------------------------------------------------------------
|
|---|
| 132 | .StoreUserDefinedPCHS:
|
|---|
| 133 | call AccessDPT_GetPointerToDRVPARAMStoCSBX
|
|---|
| 134 | mov ax, [cs:bx+DRVPARAMS.wCylinders]
|
|---|
| 135 | mov bx, [cs:bx+DRVPARAMS.wHeadsAndSectors]
|
|---|
| 136 | ; Fall to .StoreCHSfromAXBHBL
|
|---|
| 137 |
|
|---|
| 138 | ;--------------------------------------------------------------------
|
|---|
| 139 | ; .StoreCHSfromAXBHBL
|
|---|
| 140 | ; Parameters:
|
|---|
| 141 | ; AX: Number of P-CHS cylinders
|
|---|
| 142 | ; BH: Number of P-CHS sectors per track
|
|---|
| 143 | ; BL: Number of P-CHS heads
|
|---|
| 144 | ; DS:DI: Ptr to Disk Parameter Table
|
|---|
| 145 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
|
|---|
| 146 | ; CS:BP: Ptr to IDEVARS for the controller
|
|---|
| 147 | ; Returns:
|
|---|
| 148 | ; AX: Number of P-CHS cylinders
|
|---|
| 149 | ; BH: Number of P-CHS sectors per track
|
|---|
| 150 | ; BL: Number of P-CHS heads
|
|---|
| 151 | ; Corrupts registers:
|
|---|
| 152 | ; CX
|
|---|
| 153 | ;--------------------------------------------------------------------
|
|---|
| 154 | .StoreCHSfromAXBHBL:
|
|---|
| 155 | push ax
|
|---|
| 156 | push bx
|
|---|
| 157 | call AccessDPT_ShiftPCHinAXBLtoLCH ; Get number of bits to shift
|
|---|
| 158 | pop bx
|
|---|
| 159 | pop ax
|
|---|
| 160 | jcxz .StorePCHSfromAXDX ; Small drive so use L-CHS addressing
|
|---|
| 161 |
|
|---|
| 162 | ; Store P-CHS addressing mode and number of bits to shift in L-CHS to P-CHS translation
|
|---|
| 163 | or cl, ADDRESSING_MODE_PCHS<<ADDRESSING_MODE_FIELD_POSITION
|
|---|
| 164 | or [di+DPT.bFlagsLow], cl
|
|---|
| 165 | ; Fall to .StoreChsFromAXBLBH
|
|---|
| 166 |
|
|---|
| 167 | ;--------------------------------------------------------------------
|
|---|
| 168 | ; .StoreChsFromAXBLBH
|
|---|
| 169 | ; Parameters:
|
|---|
| 170 | ; AX: Number of P-CHS cylinders
|
|---|
| 171 | ; BH: Number of P-CHS sectors per track
|
|---|
| 172 | ; BL: Number of P-CHS heads
|
|---|
| 173 | ; DS:DI: Ptr to Disk Parameter Table
|
|---|
| 174 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
|
|---|
| 175 | ; CS:BP: Ptr to IDEVARS for the controller
|
|---|
| 176 | ; Returns:
|
|---|
| 177 | ; Nothing
|
|---|
| 178 | ; Corrupts registers:
|
|---|
| 179 | ; Nothing
|
|---|
| 180 | ;--------------------------------------------------------------------
|
|---|
| 181 | .StorePCHSfromAXDX:
|
|---|
| 182 | mov [di+DPT.wPchsCylinders], ax
|
|---|
| 183 | mov [di+DPT.wPchsHeadsAndSectors], bx
|
|---|
| 184 | ; Fall to .StoreBlockMode
|
|---|
| 185 |
|
|---|
| 186 | ;--------------------------------------------------------------------
|
|---|
| 187 | ; .StoreBlockMode
|
|---|
| 188 | ; Parameters:
|
|---|
| 189 | ; DS:DI: Ptr to Disk Parameter Table
|
|---|
| 190 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
|
|---|
| 191 | ; CS:BP: Ptr to IDEVARS for the controller
|
|---|
| 192 | ; Returns:
|
|---|
| 193 | ; Nothing
|
|---|
| 194 | ; Corrupts registers:
|
|---|
| 195 | ; Nothing
|
|---|
| 196 | ;--------------------------------------------------------------------
|
|---|
| 197 | .StoreBlockMode:
|
|---|
| 198 | cmp BYTE [es:si+ATA1.bBlckSize], 1 ; Max block size in sectors
|
|---|
| 199 | jbe SHORT .BlockModeTransfersNotSupported
|
|---|
| 200 | or BYTE [di+DPT.bFlagsHigh], FLGH_DPT_BLOCK_MODE_SUPPORTED
|
|---|
| 201 | .BlockModeTransfersNotSupported:
|
|---|
| 202 | ; Fall to .StoreDeviceSpecificParameters
|
|---|
| 203 |
|
|---|
| 204 | ;--------------------------------------------------------------------
|
|---|
| 205 | ; .StoreDeviceSpecificParameters
|
|---|
| 206 | ; Parameters:
|
|---|
| 207 | ; DS:DI: Ptr to Disk Parameter Table
|
|---|
| 208 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
|
|---|
| 209 | ; CS:BP: Ptr to IDEVARS for the controller
|
|---|
| 210 | ; Returns:
|
|---|
| 211 | ; Nothing
|
|---|
| 212 | ; Corrupts registers:
|
|---|
| 213 | ; AX, BX, CX, DX
|
|---|
| 214 | ;--------------------------------------------------------------------
|
|---|
| 215 | .StoreDeviceSpecificParameters:
|
|---|
| 216 | call Device_FinalizeDPT
|
|---|
| 217 |
|
|---|
| 218 | ;----------------------------------------------------------------------
|
|---|
| 219 | ; Update drive counts (hard and floppy)
|
|---|
| 220 | ;----------------------------------------------------------------------
|
|---|
| 221 |
|
|---|
| 222 | %ifdef MODULE_SERIAL_FLOPPY
|
|---|
| 223 | ;
|
|---|
| 224 | ; These two instructions serve two purposes:
|
|---|
| 225 | ; 1. If the drive is a floppy drive (CF set), then we effectively increment the counter.
|
|---|
| 226 | ; 2. If this is a hard disk, and there have been any floppy drives previously added, then the hard disk is
|
|---|
| 227 | ; effectively discarded. This is more of a safety check then code that should ever normally be hit (see below).
|
|---|
| 228 | ; Since the floppy DPT's come after the hard disk DPT's, without expensive (code size) code to relocate a DPT,
|
|---|
| 229 | ; this was necessary. Now, this situation shouldn't happen in normal operation, for a couple of reasons:
|
|---|
| 230 | ; A. xtidecfg always puts configured serial ports at the end of the IDEVARS list
|
|---|
| 231 | ; B. the auto serial code is always executed last
|
|---|
| 232 | ; C. the serial server always returns floppy drives last
|
|---|
| 233 | ;
|
|---|
| 234 | adc byte [RAMVARS.xlateVars+XLATEVARS.bFlopCreateCnt], 0
|
|---|
| 235 | jnz .AllDone
|
|---|
| 236 | %else
|
|---|
| 237 | ;
|
|---|
| 238 | ; Even without floppy support enabled, we shouldn't try to mount a floppy image as a hard disk, which
|
|---|
| 239 | ; could lead to unpredictable results since no MBR will be present, etc. The server doesn't know that
|
|---|
| 240 | ; floppies are supported, so it is important to still fail here if a floppy is seen during the drive scan.
|
|---|
| 241 | ;
|
|---|
| 242 | jc .AllDone
|
|---|
| 243 | %endif
|
|---|
| 244 |
|
|---|
| 245 | inc BYTE [RAMVARS.bDrvCnt] ; Increment drive count to RAMVARS
|
|---|
| 246 |
|
|---|
| 247 | .AllDone:
|
|---|
| 248 | clc
|
|---|
| 249 | ret
|
|---|
| 250 |
|
|---|
| 251 |
|
|---|
| 252 | ;--------------------------------------------------------------------
|
|---|
| 253 | ; StoreLbaAddressingAndTotalSectorCountFromBXDXAX
|
|---|
| 254 | ; Parameters:
|
|---|
| 255 | ; BX:DX:AX: Total Sector Count
|
|---|
| 256 | ; DS:DI: Ptr to Disk Parameter Table
|
|---|
| 257 | ; Returns:
|
|---|
| 258 | ; Nothing
|
|---|
| 259 | ; Corrupts registers:
|
|---|
| 260 | ; CX
|
|---|
| 261 | ;--------------------------------------------------------------------
|
|---|
| 262 | StoreLbaAddressingAndTotalSectorCountFromBXDXAX:
|
|---|
| 263 | mov [di+DPT.twLbaSectors], ax
|
|---|
| 264 | mov [di+DPT.twLbaSectors+2], dx
|
|---|
| 265 | mov [di+DPT.twLbaSectors+4], bx
|
|---|
| 266 |
|
|---|
| 267 | and BYTE [di+DPT.bFlagsLow], ~MASKL_DPT_ADDRESSING_MODE
|
|---|
| 268 | test bx, bx
|
|---|
| 269 | jnz SHORT .SetLba48AddressingToDPT
|
|---|
| 270 | test dh, 0F0h
|
|---|
| 271 | jz SHORT .SetLba28AddressingToDPT
|
|---|
| 272 | .SetLba48AddressingToDPT:
|
|---|
| 273 | or BYTE [di+DPT.bFlagsLow], ADDRESSING_MODE_LBA48<<ADDRESSING_MODE_FIELD_POSITION
|
|---|
| 274 | .SetLba28AddressingToDPT:
|
|---|
| 275 | or BYTE [di+DPT.bFlagsLow], ADDRESSING_MODE_LBA28<<ADDRESSING_MODE_FIELD_POSITION
|
|---|
| 276 | ret
|
|---|
