| 1 | ; Project name : XTIDE Universal BIOS
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| 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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| 9 | ; Creates new BOOTMENUINFO struct for detected hard disk.
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| 10 | ;
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| 11 | ; BootMenuInfo_CreateForHardDisk
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| 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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| 17 | ; ES:BX: Ptr to BOOTMENUINFO (if successful)
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| 18 | ; Corrupts registers:
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| 19 | ; AX, CX, DX, DI
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| 20 | ;--------------------------------------------------------------------
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| 21 | BootMenuInfo_CreateForHardDisk:
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| 22 | call BootMenuInfo_ConvertDPTtoBX ; ES:BX now points to new BOOTMENUINFO
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| 23 | push ds ; Preserve RAMVARS...
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| 24 | push si ; ...and SI
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| 25 |
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| 26 | push es ; ES to be copied to DS
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| 27 |
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| 28 | %ifdef MODULE_ADVANCED_ATA
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| 29 | ; Copy DPT_ADVANCED_ATA to BOOTMENUINFO to keep DPTs small.
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| 30 | ; DPT_ADVANCED_ATA has variables that are only needed during initialization.
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| 31 | mov ax, [di+DPT_ADVANCED_ATA.wIdeBasePort]
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| 32 | mov [es:bx+BOOTMENUINFO.wIdeBasePort], ax
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| 33 | mov dx, [di+DPT_ADVANCED_ATA.wMinPioActiveTimeNs]
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| 34 | mov [es:bx+BOOTMENUINFO.wMinPioActiveTimeNs], dx
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| 35 |
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| 36 | mov ax, [di+DPT_ADVANCED_ATA.wMinPioRecoveryTimeNs]
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| 37 | mov cx, [di+DPT_ADVANCED_ATA.wControllerID]
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| 38 | mov dx, [di+DPT_ADVANCED_ATA.wControllerBasePort]
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| 39 | pop ds ; ES copied to DS
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| 40 | mov [bx+BOOTMENUINFO.wMinPioRecoveryTimeNs], ax
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| 41 | mov [bx+BOOTMENUINFO.wControllerID], cx
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| 42 | mov [bx+BOOTMENUINFO.wControllerBasePort], dx
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| 43 |
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| 44 | %else
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| 45 | pop ds ; ES copied to DS
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| 46 | %endif
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| 47 |
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| 48 | ; Store Drive Name
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| 49 | add si, BYTE ATA1.strModel ; DS:SI now points drive name
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| 50 | lea di, [bx+BOOTMENUINFO.szDrvName] ; ES:DI now points to name destination
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| 51 | mov cx, MAX_HARD_DISK_NAME_LENGTH / 2 ; Max number of WORDs allowed
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| 52 | .CopyNextWord:
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| 53 | lodsw
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| 54 | xchg al, ah ; Change endianness
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| 55 | stosw
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| 56 | loop .CopyNextWord
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| 57 | xor ax, ax ; Zero AX and clear CF
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| 58 | stosw ; Terminate with NULL
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| 59 |
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| 60 | pop si
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| 61 | pop ds
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| 62 | ret
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| 63 |
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| 64 |
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| 65 | ;--------------------------------------------------------------------
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| 66 | ; BootMenuInfo_GetTotalSectorCount
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| 67 | ; Parameters:
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| 68 | ; DS:DI: DPT Pointer
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| 69 | ; Returns:
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| 70 | ; BX:DX:AX: 48-bit sector count
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| 71 | ; Corrupts registers:
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| 72 | ; CX
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| 73 | ;--------------------------------------------------------------------
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| 74 | BootMenuInfo_GetTotalSectorCount:
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| 75 | test BYTE [di+DPT.bFlagsLow], FLG_DRVNHEAD_LBA
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| 76 | jnz SHORT .ReturnFullCapacity
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| 77 | jmp AH15h_GetSectorCountToBXDXAX
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| 78 | .ReturnFullCapacity:
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| 79 | jmp AccessDPT_GetLbaSectorCountToBXDXAX
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| 80 |
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| 81 |
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| 82 | ;--------------------------------------------------------------------
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| 83 | ; BootMenuInfo_IsAvailable
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| 84 | ; Parameters:
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| 85 | ; Nothing
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| 86 | ; Returns:
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| 87 | ; ES: Segment to BOOTVARS with BOOTMENUINFOs
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| 88 | ; ZF: Set if BOOTVARS with BOOTMENUINFOs is available
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| 89 | ; Cleared if not available (no longer initializing)
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| 90 | ; Corrupts registers:
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| 91 | ; BX
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| 92 | ;--------------------------------------------------------------------
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| 93 | BootMenuInfo_IsAvailable:
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| 94 | LOAD_BDA_SEGMENT_TO es, bx
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| 95 | cmp WORD [es:BOOTVARS.wMagicWord], BOOTVARS_MAGIC_WORD
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| 96 | ret
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| 97 |
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| 98 |
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| 99 | ;--------------------------------------------------------------------
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| 100 | ; Returns offset to BOOTMENUINFO based on DPT pointer.
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| 101 | ;
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| 102 | ; BootMenuInfo_ConvertDPTtoBX
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| 103 | ; Parameters:
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| 104 | ; DS:DI: DPT Pointer
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| 105 | ; Returns:
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| 106 | ; BX: Offset to BOOTMENUINFO struct
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| 107 | ; Corrupts registers:
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| 108 | ; Nothing
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| 109 | ;--------------------------------------------------------------------
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| 110 | BootMenuInfo_ConvertDPTtoBX:
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| 111 | push ax
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| 112 | mov ax, di
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| 113 | sub ax, BYTE RAMVARS_size ; subtract off base of DPTs
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| 114 | mov bl, DPT_BOOTMENUINFO_SIZE_MULTIPLIER ; BOOTMENUINFO's are a whole number multiple of DPT size
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| 115 | mul bl
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| 116 | add ax, BOOTVARS.rgBootNfo ; add base of BOOTMENUINFO
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| 117 | xchg ax, bx
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| 118 | pop ax
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| 119 | ret
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