| [88] | 1 | ; Project name : XTIDE Universal BIOS |
|---|
| [3] | 2 | ; Description : Functions for generating and accessing drive |
|---|
| 3 | ; information to be displayed on boot menu. |
|---|
| 4 | |
|---|
| 5 | ; Section containing code |
|---|
| 6 | SECTION .text |
|---|
| 7 | |
|---|
| 8 | ;-------------------------------------------------------------------- |
|---|
| [254] | 9 | ; Creates new BOOTMENUINFO struct for detected hard disk. |
|---|
| [3] | 10 | ; |
|---|
| [254] | 11 | ; BootMenuInfo_CreateForHardDisk |
|---|
| [3] | 12 | ; Parameters: |
|---|
| 13 | ; DL: Drive number |
|---|
| 14 | ; DS:DI: Ptr to Disk Parameter Table |
|---|
| 15 | ; ES:SI: Ptr to 512-byte ATA information read from the drive |
|---|
| 16 | ; Returns: |
|---|
| [254] | 17 | ; ES:BX: Ptr to BOOTMENUINFO (if successful) |
|---|
| [3] | 18 | ; Corrupts registers: |
|---|
| [364] | 19 | ; AX, BX, CX, DX, DI |
|---|
| [3] | 20 | ;-------------------------------------------------------------------- |
|---|
| [254] | 21 | BootMenuInfo_CreateForHardDisk: |
|---|
| 22 | call BootMenuInfo_ConvertDPTtoBX ; ES:BX now points to new BOOTMENUINFO |
|---|
| [3] | 23 | |
|---|
| [364] | 24 | ; Store Drive Name |
|---|
| 25 | push ds ; Preserve RAMVARS |
|---|
| 26 | push si |
|---|
| [3] | 27 | |
|---|
| [364] | 28 | push es ; ES copied to DS |
|---|
| 29 | pop ds |
|---|
| [241] | 30 | |
|---|
| [254] | 31 | add si, BYTE ATA1.strModel ; DS:SI now points drive name |
|---|
| 32 | lea di, [bx+BOOTMENUINFO.szDrvName] ; ES:DI now points to name destination |
|---|
| 33 | mov cx, MAX_HARD_DISK_NAME_LENGTH / 2 ; Max number of WORDs allowed |
|---|
| [121] | 34 | .CopyNextWord: |
|---|
| 35 | lodsw |
|---|
| [254] | 36 | xchg al, ah ; Change endianness |
|---|
| [121] | 37 | stosw |
|---|
| 38 | loop .CopyNextWord |
|---|
| [254] | 39 | xor ax, ax ; Zero AX and clear CF |
|---|
| 40 | stosw ; Terminate with NULL |
|---|
| [3] | 41 | |
|---|
| 42 | pop si |
|---|
| 43 | pop ds |
|---|
| [364] | 44 | |
|---|
| [3] | 45 | ret |
|---|
| 46 | |
|---|
| [252] | 47 | |
|---|
| [3] | 48 | ;-------------------------------------------------------------------- |
|---|
| [254] | 49 | ; BootMenuInfo_GetTotalSectorCount |
|---|
| [3] | 50 | ; Parameters: |
|---|
| [241] | 51 | ; DS:DI: DPT Pointer |
|---|
| [3] | 52 | ; Returns: |
|---|
| 53 | ; BX:DX:AX: 48-bit sector count |
|---|
| 54 | ; Corrupts registers: |
|---|
| [252] | 55 | ; CX |
|---|
| [128] | 56 | ;-------------------------------------------------------------------- |
|---|
| [364] | 57 | ALIGN JUMP_ALIGN |
|---|
| [254] | 58 | BootMenuInfo_GetTotalSectorCount: |
|---|
| [252] | 59 | test BYTE [di+DPT.bFlagsLow], FLG_DRVNHEAD_LBA |
|---|
| 60 | jnz SHORT .ReturnFullCapacity |
|---|
| 61 | jmp AH15h_GetSectorCountToBXDXAX |
|---|
| 62 | .ReturnFullCapacity: |
|---|
| 63 | jmp AccessDPT_GetLbaSectorCountToBXDXAX |
|---|
| [100] | 64 | |
|---|
| 65 | |
|---|
| 66 | ;-------------------------------------------------------------------- |
|---|
| [254] | 67 | ; Returns offset to BOOTMENUINFO based on DPT pointer. |
|---|
| [100] | 68 | ; |
|---|
| [254] | 69 | ; BootMenuInfo_ConvertDPTtoBX |
|---|
| [100] | 70 | ; Parameters: |
|---|
| [241] | 71 | ; DS:DI: DPT Pointer |
|---|
| [100] | 72 | ; Returns: |
|---|
| [254] | 73 | ; BX: Offset to BOOTMENUINFO struct |
|---|
| [100] | 74 | ; Corrupts registers: |
|---|
| [365] | 75 | ; AX |
|---|
| [100] | 76 | ;-------------------------------------------------------------------- |
|---|
| [254] | 77 | BootMenuInfo_ConvertDPTtoBX: |
|---|
| [241] | 78 | mov ax, di |
|---|
| [363] | 79 | sub ax, BYTE RAMVARS_size ; subtract off base of DPTs |
|---|
| [254] | 80 | mov bl, DPT_BOOTMENUINFO_SIZE_MULTIPLIER ; BOOTMENUINFO's are a whole number multiple of DPT size |
|---|
| [241] | 81 | mul bl |
|---|
| [254] | 82 | add ax, BOOTVARS.rgBootNfo ; add base of BOOTMENUINFO |
|---|
| [241] | 83 | xchg ax, bx |
|---|
| [364] | 84 | ret |
|---|
