[3] | 1 | ; Project name : IDE BIOS |
---|
| 2 | ; Description : Functions for detecting drive for the BIOS. |
---|
| 3 | |
---|
| 4 | ; Section containing code |
---|
| 5 | SECTION .text |
---|
| 6 | |
---|
| 7 | ;-------------------------------------------------------------------- |
---|
| 8 | ; Detects all IDE hard disks to be controlled by this BIOS. |
---|
| 9 | ; |
---|
| 10 | ; DetectDrives_FromAllIDEControllers |
---|
| 11 | ; Parameters: |
---|
| 12 | ; DS: RAMVARS segment |
---|
| 13 | ; ES: BDA segment (zero) |
---|
| 14 | ; Returns: |
---|
| 15 | ; Nothing |
---|
| 16 | ; Corrupts registers: |
---|
| 17 | ; All (not segments) |
---|
| 18 | ;-------------------------------------------------------------------- |
---|
| 19 | ALIGN JUMP_ALIGN |
---|
| 20 | DetectDrives_FromAllIDEControllers: |
---|
[33] | 21 | call RamVars_GetIdeControllerCountToCX |
---|
[3] | 22 | mov bp, ROMVARS.ideVars0 ; CS:BP now points to first IDEVARS |
---|
| 23 | ALIGN JUMP_ALIGN |
---|
| 24 | .DriveDetectLoop: |
---|
| 25 | call DetectDrives_WithIDEVARS ; Detect Master and Slave |
---|
| 26 | add bp, BYTE IDEVARS_size ; Point to next IDEVARS |
---|
| 27 | loop .DriveDetectLoop |
---|
| 28 | ret |
---|
| 29 | |
---|
| 30 | |
---|
| 31 | ;-------------------------------------------------------------------- |
---|
| 32 | ; Detects IDE hard disks by using information from IDEVARS. |
---|
| 33 | ; |
---|
| 34 | ; DetectDrives_WithIDEVARS |
---|
| 35 | ; Parameters: |
---|
| 36 | ; CS:BP: Ptr to IDEVARS |
---|
| 37 | ; DS: RAMVARS segment |
---|
| 38 | ; ES: Zero (BDA segment) |
---|
| 39 | ; Returns: |
---|
| 40 | ; Nothing |
---|
| 41 | ; Corrupts registers: |
---|
| 42 | ; AX, BX, DX, SI, DI |
---|
| 43 | ;-------------------------------------------------------------------- |
---|
| 44 | ALIGN JUMP_ALIGN |
---|
| 45 | DetectDrives_WithIDEVARS: |
---|
| 46 | push cx |
---|
| 47 | call DetectPrint_StartingMasterDetect ; Print detection string |
---|
| 48 | call DetectDrives_DetectMasterDrive ; Detect and create DPT + BOOTNFO |
---|
| 49 | call DetectPrint_DriveNameOrNotFound ; Print found or not found string |
---|
| 50 | |
---|
| 51 | call DetectPrint_StartingSlaveDetect |
---|
| 52 | call DetectDrives_DetectSlaveDrive |
---|
| 53 | call DetectPrint_DriveNameOrNotFound |
---|
| 54 | pop cx |
---|
| 55 | ret |
---|
| 56 | |
---|
| 57 | |
---|
| 58 | ;-------------------------------------------------------------------- |
---|
| 59 | ; Detects IDE Master or Slave drive. |
---|
| 60 | ; |
---|
| 61 | ; DetectDrives_DetectMasterDrive |
---|
| 62 | ; DetectDrives_DetectSlaveDrive |
---|
| 63 | ; Parameters: |
---|
| 64 | ; CS:BP: Ptr to IDEVARS |
---|
| 65 | ; DS: RAMVARS segment |
---|
| 66 | ; ES: Zero (BDA segment) |
---|
| 67 | ; Returns: |
---|
| 68 | ; ES:BX: Ptr to BOOTNFO (if successful) |
---|
| 69 | ; CF: Cleared if drive detected successfully |
---|
| 70 | ; Set if any drive not found or other error |
---|
| 71 | ; Corrupts registers: |
---|
| 72 | ; AX, CX, DX, SI, DI |
---|
| 73 | ;-------------------------------------------------------------------- |
---|
| 74 | ALIGN JUMP_ALIGN |
---|
| 75 | DetectDrives_DetectMasterDrive: |
---|
| 76 | mov bh, MASK_IDE_DRVHD_SET ; Select Master drive |
---|
[86] | 77 | SKIP2B ax ; mov ax, <next instruction> |
---|
[3] | 78 | DetectDrives_DetectSlaveDrive: |
---|
| 79 | mov bh, MASK_IDE_DRVHD_SET | FLG_IDE_DRVHD_DRV |
---|
| 80 | ; Fall to DetectDrives_StartDetection |
---|
| 81 | |
---|
| 82 | ;-------------------------------------------------------------------- |
---|
| 83 | ; Detects IDE Master or Slave drive. |
---|
| 84 | ; |
---|
| 85 | ; DetectDrives_StartDetection |
---|
| 86 | ; Parameters: |
---|
| 87 | ; BH: Drive Select byte for Drive and Head Register |
---|
| 88 | ; CS:BP: Ptr to IDEVARS for the drive |
---|
| 89 | ; DS: RAMVARS segment |
---|
| 90 | ; ES: Zero (BDA segment) |
---|
| 91 | ; Returns: |
---|
| 92 | ; ES:BX: Ptr to BOOTNFO (if successful) |
---|
| 93 | ; CF: Cleared if drive detected successfully |
---|
| 94 | ; Set if any drive not found or other error |
---|
| 95 | ; Corrupts registers: |
---|
| 96 | ; AX, CX, DX, SI, DI |
---|
| 97 | ;-------------------------------------------------------------------- |
---|
| 98 | ALIGN JUMP_ALIGN |
---|
| 99 | DetectDrives_StartDetection: |
---|
| 100 | call DetectDrives_ReadAtaInfoFromDrive ; Assume hard disk |
---|
| 101 | jnc SHORT DetectDrives_CreateBiosTablesForHardDisk |
---|
| 102 | call DetectDrives_ReadAtapiInfoFromDrive ; Assume CD-ROM |
---|
| 103 | jnc SHORT DetectDrives_CreateBiosTablesForCDROM |
---|
| 104 | ret |
---|
| 105 | |
---|
| 106 | |
---|
| 107 | ;-------------------------------------------------------------------- |
---|
| 108 | ; Reads ATA information from the drive (for hard disks). |
---|
| 109 | ; |
---|
| 110 | ; DetectDrives_ReadAtaInfoFromDrive |
---|
| 111 | ; Parameters: |
---|
| 112 | ; BH: Drive Select byte for Drive and Head Register |
---|
| 113 | ; CS:BP: Ptr to IDEVARS for the drive |
---|
| 114 | ; DS: RAMVARS segment |
---|
| 115 | ; ES: Zero (BDA segment) |
---|
| 116 | ; Returns: |
---|
| 117 | ; ES:SI Ptr to ATA information (read with IDENTIFY DEVICE command) |
---|
| 118 | ; CF: Cleared if ATA-information read successfully |
---|
| 119 | ; Set if any error |
---|
| 120 | ; Corrupts registers: |
---|
| 121 | ; AX, BL, CX, DX, DI |
---|
| 122 | ;-------------------------------------------------------------------- |
---|
| 123 | ALIGN JUMP_ALIGN |
---|
| 124 | DetectDrives_ReadAtaInfoFromDrive: |
---|
| 125 | mov bl, [cs:bp+IDEVARS.bBusType]; Load BUS type |
---|
| 126 | mov dx, [cs:bp+IDEVARS.wPort] ; Load IDE Base Port address |
---|
| 127 | mov di, BOOTVARS.rgbAtaInfo ; ES:DI now points to ATA info location |
---|
| 128 | call AH25h_GetDriveInfo |
---|
| 129 | mov si, di ; ES:SI now points to ATA information |
---|
| 130 | ret |
---|
| 131 | |
---|
| 132 | |
---|
| 133 | ;-------------------------------------------------------------------- |
---|
| 134 | ; Creates all BIOS tables for detected hard disk. |
---|
| 135 | ; |
---|
| 136 | ; DetectDrives_CreateBiosTablesForHardDisk |
---|
| 137 | ; Parameters: |
---|
| 138 | ; BH: Drive Select byte for Drive and Head Register |
---|
| 139 | ; CS:BP: Ptr to IDEVARS for the drive |
---|
| 140 | ; ES:SI Ptr to ATA information for the drive |
---|
| 141 | ; DS: RAMVARS segment |
---|
| 142 | ; Returns: |
---|
| 143 | ; ES:BX: Ptr to BOOTNFO (if successful) |
---|
| 144 | ; CF: Cleared if BIOS tables created succesfully |
---|
| 145 | ; Set if any error |
---|
| 146 | ; Corrupts registers: |
---|
| 147 | ; AX, CX, DX, SI, DI |
---|
| 148 | ;-------------------------------------------------------------------- |
---|
| 149 | ALIGN JUMP_ALIGN |
---|
| 150 | DetectDrives_CreateBiosTablesForHardDisk: |
---|
| 151 | call CreateDPT_FromAtaInformation |
---|
| 152 | jc SHORT .InvalidAtaInfo |
---|
| 153 | call BootInfo_CreateForHardDisk |
---|
| 154 | ;jc SHORT .InvalidAtaInfo |
---|
| 155 | ; Call to search for BIOS partitions goes here |
---|
| 156 | ;clc |
---|
| 157 | .InvalidAtaInfo: |
---|
| 158 | ret |
---|
| 159 | |
---|
| 160 | |
---|
| 161 | ;-------------------------------------------------------------------- |
---|
[86] | 162 | ; Reads ATAPI information from the drive (for CD/DVD-ROMs). |
---|
| 163 | ; |
---|
| 164 | ; DetectDrives_ReadAtapiInfoFromDrive |
---|
| 165 | ; Parameters: |
---|
| 166 | ; BH: Drive Select byte for Drive and Head Register |
---|
| 167 | ; CS:BP: Ptr to IDEVARS for the drive |
---|
| 168 | ; DS: RAMVARS segment |
---|
| 169 | ; ES: Zero (BDA segment) |
---|
| 170 | ; Returns: |
---|
| 171 | ; ES:SI Ptr to ATAPI information (read with IDENTIFY PACKET DEVICE command) |
---|
| 172 | ; CF: Cleared if ATAPI-information read successfully |
---|
| 173 | ; Set if any error |
---|
| 174 | ; Corrupts registers: |
---|
| 175 | ; AX, BL, CX, DX, DI |
---|
| 176 | ;-------------------------------------------------------------------- |
---|
| 177 | ALIGN JUMP_ALIGN |
---|
| 178 | DetectDrives_ReadAtapiInfoFromDrive: |
---|
| 179 | ;stc |
---|
| 180 | ;ret |
---|
| 181 | ; Fall through to DetectDrives_CreateBiosTablesForCDROM |
---|
| 182 | |
---|
| 183 | |
---|
| 184 | ;-------------------------------------------------------------------- |
---|
[3] | 185 | ; Creates all BIOS tables for detected CD/DVD-ROM. |
---|
| 186 | ; |
---|
| 187 | ; DetectDrives_CreateBiosTablesForCDROM |
---|
| 188 | ; Parameters: |
---|
| 189 | ; BH: Drive Select byte for Drive and Head Register |
---|
| 190 | ; CS:BP: Ptr to IDEVARS for the drive |
---|
| 191 | ; ES:SI Ptr to ATAPI information for the drive |
---|
| 192 | ; DS: RAMVARS segment |
---|
| 193 | ; Returns: |
---|
| 194 | ; ES:BX: Ptr to BOOTNFO (if successful) |
---|
| 195 | ; CF: Cleared if BIOS tables created succesfully |
---|
| 196 | ; Set if any error |
---|
| 197 | ; Corrupts registers: |
---|
| 198 | ; AX, CX, DX, SI, DI |
---|
| 199 | ;-------------------------------------------------------------------- |
---|
| 200 | ALIGN JUMP_ALIGN |
---|
| 201 | DetectDrives_CreateBiosTablesForCDROM: |
---|
| 202 | stc |
---|
| 203 | ret |
---|