| [88] | 1 | ; Project name : XTIDE Universal BIOS
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| [3] | 2 | ; Description : Functions for generating and accessing drive
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| 3 | ; information to be displayed on boot menu.
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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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| [254] | 9 | ; Creates new BOOTMENUINFO struct for detected hard disk.
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| [3] | 10 | ;
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| [254] | 11 | ; BootMenuInfo_CreateForHardDisk
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| [3] | 12 | ; Parameters:
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| 13 | ; DL: Drive number
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| 14 | ; DS:DI: Ptr to Disk Parameter Table
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| 15 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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| 16 | ; Returns:
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| [254] | 17 | ; ES:BX: Ptr to BOOTMENUINFO (if successful)
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| [3] | 18 | ; Corrupts registers:
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| [364] | 19 | ; AX, BX, CX, DX, DI
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| [3] | 20 | ;--------------------------------------------------------------------
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| [254] | 21 | BootMenuInfo_CreateForHardDisk:
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| 22 | call BootMenuInfo_ConvertDPTtoBX ; ES:BX now points to new BOOTMENUINFO
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| [3] | 23 |
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| [364] | 24 | ; Store Drive Name
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| 25 | push ds ; Preserve RAMVARS
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| 26 | push si
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| [3] | 27 |
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| [364] | 28 | push es ; ES copied to DS
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| 29 | pop ds
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| [241] | 30 |
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| [254] | 31 | add si, BYTE ATA1.strModel ; DS:SI now points drive name
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| 32 | lea di, [bx+BOOTMENUINFO.szDrvName] ; ES:DI now points to name destination
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| 33 | mov cx, MAX_HARD_DISK_NAME_LENGTH / 2 ; Max number of WORDs allowed
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| [121] | 34 | .CopyNextWord:
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| 35 | lodsw
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| [254] | 36 | xchg al, ah ; Change endianness
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| [121] | 37 | stosw
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| 38 | loop .CopyNextWord
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| [254] | 39 | xor ax, ax ; Zero AX and clear CF
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| 40 | stosw ; Terminate with NULL
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| [3] | 41 |
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| 42 | pop si
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| 43 | pop ds
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| [364] | 44 |
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| [3] | 45 | ret
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| 46 |
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| [252] | 47 |
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| [3] | 48 | ;--------------------------------------------------------------------
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| [254] | 49 | ; BootMenuInfo_GetTotalSectorCount
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| [3] | 50 | ; Parameters:
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| [241] | 51 | ; DS:DI: DPT Pointer
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| [3] | 52 | ; Returns:
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| 53 | ; BX:DX:AX: 48-bit sector count
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| 54 | ; Corrupts registers:
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| [252] | 55 | ; CX
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| [128] | 56 | ;--------------------------------------------------------------------
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| [364] | 57 | ALIGN JUMP_ALIGN
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| [254] | 58 | BootMenuInfo_GetTotalSectorCount:
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| [252] | 59 | test BYTE [di+DPT.bFlagsLow], FLG_DRVNHEAD_LBA
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| 60 | jnz SHORT .ReturnFullCapacity
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| 61 | jmp AH15h_GetSectorCountToBXDXAX
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| 62 | .ReturnFullCapacity:
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| 63 | jmp AccessDPT_GetLbaSectorCountToBXDXAX
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| [100] | 64 |
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| 65 |
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| 66 | ;--------------------------------------------------------------------
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| [363] | 67 | ; BootMenuInfo_IsAvailable
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| 68 | ; Parameters:
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| 69 | ; Nothing
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| 70 | ; Returns:
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| 71 | ; ES: Segment to BOOTVARS with BOOTMENUINFOs
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| 72 | ; ZF: Set if BOOTVARS with BOOTMENUINFOs is available
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| 73 | ; Cleared if not available (no longer initializing)
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| 74 | ; Corrupts registers:
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| 75 | ; BX
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| 76 | ;--------------------------------------------------------------------
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| 77 | BootMenuInfo_IsAvailable:
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| 78 | LOAD_BDA_SEGMENT_TO es, bx
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| 79 | cmp WORD [es:BOOTVARS.wMagicWord], BOOTVARS_MAGIC_WORD
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| 80 | ret
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| 81 |
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| 82 |
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| 83 | ;--------------------------------------------------------------------
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| [254] | 84 | ; Returns offset to BOOTMENUINFO based on DPT pointer.
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| [100] | 85 | ;
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| [254] | 86 | ; BootMenuInfo_ConvertDPTtoBX
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| [100] | 87 | ; Parameters:
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| [241] | 88 | ; DS:DI: DPT Pointer
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| [100] | 89 | ; Returns:
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| [254] | 90 | ; BX: Offset to BOOTMENUINFO struct
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| [100] | 91 | ; Corrupts registers:
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| [363] | 92 | ; Nothing
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| [100] | 93 | ;--------------------------------------------------------------------
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| [254] | 94 | BootMenuInfo_ConvertDPTtoBX:
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| [363] | 95 | push ax
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| [241] | 96 | mov ax, di
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| [363] | 97 | sub ax, BYTE RAMVARS_size ; subtract off base of DPTs
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| [254] | 98 | mov bl, DPT_BOOTMENUINFO_SIZE_MULTIPLIER ; BOOTMENUINFO's are a whole number multiple of DPT size
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| [241] | 99 | mul bl
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| [254] | 100 | add ax, BOOTVARS.rgBootNfo ; add base of BOOTMENUINFO
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| [241] | 101 | xchg ax, bx
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| [363] | 102 | pop ax
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| [364] | 103 | ret
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