| [327] | 1 | ; Project name : BIOS Drive Information Tool
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| 2 | ; Description : Functions to read information from BIOS.
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| 3 |
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| 4 |
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| 5 | ; Section containing code
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| 6 | SECTION .text
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| 7 |
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| 8 | ;---------------------------------------------------------------------
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| 9 | ; Bios_GetNumberOfHardDrivesToDX
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| 10 | ; Parameters:
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| 11 | ; Nothing
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| 12 | ; Returns: (if no errors)
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| 13 | ; DX: Number of hard drives in system
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| 14 | ; CF: Set if no hard drives found
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| 15 | ; Corrupts registers:
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| 16 | ; AX, BX, CX
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| 17 | ;--------------------------------------------------------------------
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| 18 | ALIGN JUMP_ALIGN
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| 19 | Bios_GetNumberOfHardDrivesToDX:
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| 20 | mov dl, 80h ; First hard drive
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| 21 | mov ah, GET_DRIVE_PARAMETERS
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| 22 | int BIOS_DISK_INTERRUPT_13h
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| 23 | mov dh, 0 ; Preserve CF
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| 24 | ret
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| 25 |
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| 26 |
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| 27 | ;---------------------------------------------------------------------
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| 28 | ; Bios_ReadOldInt13hParametersFromDriveDL
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| 29 | ; Parameters:
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| 30 | ; DL: BIOS drive number
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| 31 | ; Returns: (if no errors)
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| 32 | ; BL: Drive Type (for floppies only)
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| 33 | ; AX: Sectors per track (1...63)
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| 34 | ; DX: Number of heads (1...255)
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| 35 | ; CX: Number of cylinders (1...1024)
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| 36 | ; CF: Cleared = no errors
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| 37 | ; Set = BIOS error code stored in AH
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| 38 | ; Corrupts registers:
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| 39 | ; Nothing
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| 40 | ;--------------------------------------------------------------------
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| 41 | ALIGN JUMP_ALIGN
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| 42 | Bios_ReadOldInt13hParametersFromDriveDL:
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| 43 | mov ah, GET_DRIVE_PARAMETERS
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| 44 | int BIOS_DISK_INTERRUPT_13h
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| 45 | jc SHORT ReturnWithBiosErrorCodeInAH
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| 46 | ; Fall to ExtractCHSfromOldInt13hDriveParameters
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| 47 |
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| 48 | ;---------------------------------------------------------------------
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| 49 | ; ExtractCHSfromOldInt13hDriveParameters
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| 50 | ; Parameters:
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| 51 | ; CH: Maximum cylinder number, bits 7...0
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| 52 | ; CL: Bits 7...6: Maximum cylinder number, bits 9 and 8
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| 53 | ; Bits 5...0: Maximum sector number (1...63)
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| 54 | ; DH: Maximum head number (0...254)
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| 55 | ; Returns:
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| 56 | ; BL: Drive Type (for floppies only)
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| 57 | ; AX: Sectors per track (1...63)
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| 58 | ; DX: Number of heads (1...255)
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| 59 | ; CX: Number of cylinders (1...1024)
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| 60 | ; CF: Cleared
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| 61 | ; Corrupts registers:
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| 62 | ; Nothing
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| 63 | ;--------------------------------------------------------------------
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| 64 | ExtractCHSfromOldInt13hDriveParameters:
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| 65 | mov al, cl ; Copy sector number...
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| 66 | and ax, BYTE 3Fh ; ...and limit to 1...63
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| 67 | sub cl, al ; Remove from max cylinder high
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| 68 | eROL_IM cl, 2 ; High bits to beginning
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| 69 | eMOVZX dx, dh ; Copy Max head to DX
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| 70 | xchg cl, ch ; Max cylinder now in CX
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| 71 | inc cx ; Max cylinder to number of cylinders
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| 72 | inc dx ; Max head to number of heads
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| 73 | clc ; No errors
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| 74 | ret
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| 75 |
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| 76 |
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| 77 | ;---------------------------------------------------------------------
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| 78 | ; Bios_ReadOldInt13hCapacityFromDriveDL
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| 79 | ; Parameters:
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| 80 | ; DL: BIOS drive number
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| 81 | ; Returns: (if no errors)
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| 82 | ; CX:DX: Total number of sectors
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| 83 | ; AH: BIOS Error code
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| 84 | ; CF: Cleared = no errors
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| 85 | ; Set = BIOS error code stored in AH
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| 86 | ; Corrupts registers:
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| 87 | ; Nothing
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| 88 | ;--------------------------------------------------------------------
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| 89 | ALIGN JUMP_ALIGN
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| 90 | Bios_ReadOldInt13hCapacityFromDriveDL:
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| 91 | mov ah, GET_DISK_TYPE
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| 92 | int BIOS_DISK_INTERRUPT_13h
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| 93 | jc SHORT ReturnInvalidErrorCodeInAH
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| 94 | xor ah, ah
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| 95 | ret
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| 96 |
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| 97 |
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| 98 | ;---------------------------------------------------------------------
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| 99 | ; Bios_ReadAtaInfoFromDriveDLtoBX
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| 100 | ; Parameters:
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| 101 | ; DL: BIOS drive number
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| 102 | ; Returns: (if no errors)
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| 103 | ; DS:BX: Ptr to ATA information
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| 104 | ; AH: BIOS Error code
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| 105 | ; CF: Cleared = no errors
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| 106 | ; Set = BIOS error code stored in AH
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| 107 | ; Corrupts registers:
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| 108 | ; ES
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| 109 | ;--------------------------------------------------------------------
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| 110 | ALIGN JUMP_ALIGN
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| 111 | Bios_ReadAtaInfoFromDriveDLtoBX:
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| 112 | mov bx, g_rgbAtaInfo
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| 113 | push ds
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| 114 | pop es
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| 115 | mov ah, GET_DRIVE_INFORMATION
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| 116 | int BIOS_DISK_INTERRUPT_13h
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| 117 | ret
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| 118 |
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| 119 |
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| 120 | ;---------------------------------------------------------------------
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| 121 | ; Bios_ReadEbiosVersionFromDriveDL
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| 122 | ; Parameters:
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| 123 | ; DL: BIOS drive number
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| 124 | ; Returns:
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| 125 | ; AH: BIOS error code
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| 126 | ; BX: Version of extensions
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| 127 | ; CX: Interface support bit map
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| 128 | ; CF: Cleared = no errors
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| 129 | ; Set = BIOS error code stored in AH
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| 130 | ; Corrupts registers:
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| 131 | ; Nothing
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| 132 | ;--------------------------------------------------------------------
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| 133 | ALIGN JUMP_ALIGN
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| 134 | Bios_ReadEbiosVersionFromDriveDL:
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| 135 | mov ah, CHECK_EXTENSIONS_PRESENT
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| 136 | mov bx, 55AAh
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| 137 | int BIOS_DISK_INTERRUPT_13h
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| 138 | jc SHORT .NoEbiosPresent
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| 139 | cmp bx, 0AA55h
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| 140 | jne SHORT .NoEbiosPresent
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| 141 | eMOVZX bx, ah ; Copy version to BX
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| 142 | xor ah, ah
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| 143 | ret
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| 144 | .NoEbiosPresent:
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| 145 | mov ah, RET_HD_INVALID
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| 146 | stc
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| 147 | ret
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| 148 |
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| 149 |
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| 150 | ;---------------------------------------------------------------------
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| 151 | ; Bios_ReadEbiosInfoFromDriveDLtoDSSI
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| 152 | ; Parameters:
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| 153 | ; DL: BIOS drive number
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| 154 | ; Returns: (if no errors)
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| 155 | ; DS:SI: Ptr to EDRIVE_INFO
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| 156 | ; AH: BIOS Error code
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| 157 | ; CF: Cleared = no errors
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| 158 | ; Set = BIOS error code stored in AH
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| 159 | ; Corrupts registers:
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| 160 | ; Nothing
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| 161 | ;--------------------------------------------------------------------
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| 162 | ALIGN JUMP_ALIGN
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| 163 | Bios_ReadEbiosInfoFromDriveDLtoDSSI:
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| 164 | mov si, g_edriveInfo
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| 165 | mov WORD [si+EDRIVE_INFO.wSize], MINIMUM_EDRIVEINFO_SIZE
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| 166 | mov ah, GET_EXTENDED_DRIVE_INFORMATION
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| 167 | int BIOS_DISK_INTERRUPT_13h
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| 168 | ret
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| 169 |
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| 170 |
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| 171 | ;---------------------------------------------------------------------
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| 172 | ; ReturnInvalidErrorCodeInAH
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| 173 | ; ReturnWithBiosErrorCodeInAH
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| 174 | ; Parameters:
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| 175 | ; Nothing
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| 176 | ; Returns: (if no errors)
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| 177 | ; AH: BIOS Error code
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| 178 | ; CF: Set
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| 179 | ; Corrupts registers:
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| 180 | ; Nothing
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| 181 | ;--------------------------------------------------------------------
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| 182 | ReturnInvalidErrorCodeInAH:
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| 183 | stc
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| 184 | mov ah, RET_HD_INVALID
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| 185 | ReturnWithBiosErrorCodeInAH:
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| 186 | ret
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| 187 |
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| 188 |
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| 189 | ; Section containing uninitialized data
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| 190 | SECTION .bss
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| 191 |
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| 192 | g_edriveInfo:
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| 193 | g_rgbAtaInfo: resb 512
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