| [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 | ;--------------------------------------------------------------------
|
|---|
| 9 | ; Creates new BOOTNFO struct for detected hard disk.
|
|---|
| 10 | ;
|
|---|
| 11 | ; BootInfo_CreateForHardDisk
|
|---|
| 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:
|
|---|
| 17 | ; ES:BX: Ptr to BOOTNFO (if successful)
|
|---|
| 18 | ; CF: Cleared if BOOTNFO created succesfully
|
|---|
| 19 | ; Set if any error
|
|---|
| 20 | ; Corrupts registers:
|
|---|
| 21 | ; AX, BX, CX, DX
|
|---|
| 22 | ;--------------------------------------------------------------------
|
|---|
| 23 | BootInfo_CreateForHardDisk:
|
|---|
| 24 | call BootInfo_GetOffsetToBX ; ES:BX now points to new BOOTNFO
|
|---|
| [100] | 25 | ; Fall to .StoreSectorCount
|
|---|
| [3] | 26 |
|
|---|
| 27 | ;--------------------------------------------------------------------
|
|---|
| [100] | 28 | ; .StoreSectorCount
|
|---|
| [3] | 29 | ; Parameters:
|
|---|
| 30 | ; ES:BX: Ptr to BOOTNFO
|
|---|
| 31 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
|
|---|
| 32 | ; DS:DI: Ptr to Disk Parameter Table
|
|---|
| 33 | ; Returns:
|
|---|
| [100] | 34 | ; Nothing
|
|---|
| [3] | 35 | ; Corrupts registers:
|
|---|
| 36 | ; AX, CX, DX
|
|---|
| 37 | ;--------------------------------------------------------------------
|
|---|
| [100] | 38 | .StoreSectorCount:
|
|---|
| [3] | 39 | push bx
|
|---|
| [165] | 40 | call AtaID_GetTotalSectorCountToBXDXAXfromAtaInfoInESSI
|
|---|
| [3] | 41 | mov cx, bx ; Now in CX:DX:AX
|
|---|
| 42 | pop bx
|
|---|
| 43 | mov [es:bx+BOOTNFO.twSectCnt], ax
|
|---|
| 44 | mov [es:bx+BOOTNFO.twSectCnt+2], dx
|
|---|
| 45 | mov [es:bx+BOOTNFO.twSectCnt+4], cx
|
|---|
| [100] | 46 | ; Fall to .StoreDriveName
|
|---|
| [3] | 47 |
|
|---|
| 48 | ;--------------------------------------------------------------------
|
|---|
| [100] | 49 | ; .StoreDriveName
|
|---|
| [3] | 50 | ; Parameters:
|
|---|
| 51 | ; ES:BX: Ptr to BOOTNFO
|
|---|
| 52 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
|
|---|
| 53 | ; DS:DI: Ptr to Disk Parameter Table
|
|---|
| 54 | ; Returns:
|
|---|
| 55 | ; CF: Cleared if variables stored succesfully
|
|---|
| 56 | ; Set if any error
|
|---|
| 57 | ; Corrupts registers:
|
|---|
| 58 | ; AX, CX
|
|---|
| 59 | ;--------------------------------------------------------------------
|
|---|
| [100] | 60 | .StoreDriveName:
|
|---|
| [3] | 61 | push ds
|
|---|
| 62 | push si
|
|---|
| 63 | push di
|
|---|
| 64 |
|
|---|
| 65 | push es
|
|---|
| 66 | pop ds
|
|---|
| [100] | 67 | add si, BYTE ATA1.strModel ; DS:SI now points drive name
|
|---|
| 68 | lea di, [bx+BOOTNFO.szDrvName] ; ES:DI now points to name destination
|
|---|
| [121] | 69 | mov cx, LEN_BOOTNFO_DRV / 2 ; Max number of WORDs allowed
|
|---|
| 70 | .CopyNextWord:
|
|---|
| 71 | lodsw
|
|---|
| 72 | xchg al, ah ; Change endianness
|
|---|
| 73 | stosw
|
|---|
| 74 | loop .CopyNextWord
|
|---|
| [128] | 75 | xor ax, ax ; Zero AX and clear CF
|
|---|
| [100] | 76 | stosb ; Terminate with NULL
|
|---|
| [3] | 77 |
|
|---|
| 78 | pop di
|
|---|
| 79 | pop si
|
|---|
| 80 | pop ds
|
|---|
| 81 | ret
|
|---|
| 82 |
|
|---|
| 83 |
|
|---|
| 84 | ;--------------------------------------------------------------------
|
|---|
| [100] | 85 | ; Finds BOOTNFO for drive and returns total sector count.
|
|---|
| [3] | 86 | ;
|
|---|
| 87 | ; BootInfo_GetTotalSectorCount
|
|---|
| 88 | ; Parameters:
|
|---|
| 89 | ; DL: Drive number
|
|---|
| 90 | ; DS: RAMVARS segment
|
|---|
| 91 | ; Returns:
|
|---|
| 92 | ; BX:DX:AX: 48-bit sector count
|
|---|
| 93 | ; Corrupts registers:
|
|---|
| 94 | ; Nothing
|
|---|
| [128] | 95 | ;--------------------------------------------------------------------
|
|---|
| [3] | 96 | ALIGN JUMP_ALIGN
|
|---|
| 97 | BootInfo_GetTotalSectorCount:
|
|---|
| 98 | push ds
|
|---|
| 99 | call BootInfo_GetOffsetToBX
|
|---|
| 100 | LOAD_BDA_SEGMENT_TO ds, ax
|
|---|
| 101 | mov ax, [bx+BOOTNFO.twSectCnt]
|
|---|
| 102 | mov dx, [bx+BOOTNFO.twSectCnt+2]
|
|---|
| 103 | mov bx, [bx+BOOTNFO.twSectCnt+4]
|
|---|
| 104 | pop ds
|
|---|
| 105 | ret
|
|---|
| [100] | 106 |
|
|---|
| 107 |
|
|---|
| 108 | ;--------------------------------------------------------------------
|
|---|
| 109 | ; Returns offset to BOOTNFO for wanted drive.
|
|---|
| 110 | ;
|
|---|
| 111 | ; BootInfo_GetOffsetToBX
|
|---|
| 112 | ; Parameters:
|
|---|
| 113 | ; DL: Drive number
|
|---|
| 114 | ; DS: RAMVARS segment
|
|---|
| 115 | ; Returns:
|
|---|
| 116 | ; BX: Offset to BOOTNFO struct
|
|---|
| 117 | ; Corrupts registers:
|
|---|
| 118 | ; AX
|
|---|
| 119 | ;--------------------------------------------------------------------
|
|---|
| 120 | ALIGN JUMP_ALIGN
|
|---|
| 121 | BootInfo_GetOffsetToBX:
|
|---|
| 122 | mov bl, dl ; Copy drive number to BL
|
|---|
| 123 | mov al, BOOTNFO_size ; Size of struct
|
|---|
| 124 | sub bl, [RAMVARS.bFirstDrv] ; Drive number to index
|
|---|
| 125 | mul bl ; AX = Offset inside BOOTNFO array
|
|---|
| 126 | add ax, BOOTVARS.rgBootNfo ; Add offset to BOOTNFO array
|
|---|
| 127 | xchg bx, ax ; Copy result to BX
|
|---|
| 128 | ret
|
|---|
