[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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[363] | 19 | ; AX, 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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[363] | 23 | push ds ; Preserve RAMVARS... |
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| 24 | push si ; ...and SI |
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[3] | 25 | |
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[363] | 26 | push es ; ES to be copied to DS |
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[3] | 27 | |
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[363] | 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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[241] | 35 | |
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[363] | 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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[254] | 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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[121] | 52 | .CopyNextWord: |
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| 53 | lodsw |
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[254] | 54 | xchg al, ah ; Change endianness |
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[121] | 55 | stosw |
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| 56 | loop .CopyNextWord |
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[254] | 57 | xor ax, ax ; Zero AX and clear CF |
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| 58 | stosw ; Terminate with NULL |
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[3] | 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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[252] | 64 | |
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[3] | 65 | ;-------------------------------------------------------------------- |
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[254] | 66 | ; BootMenuInfo_GetTotalSectorCount |
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[3] | 67 | ; Parameters: |
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[241] | 68 | ; DS:DI: DPT Pointer |
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[3] | 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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[252] | 72 | ; CX |
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[128] | 73 | ;-------------------------------------------------------------------- |
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[254] | 74 | BootMenuInfo_GetTotalSectorCount: |
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[252] | 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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[100] | 80 | |
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| 81 | |
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| 82 | ;-------------------------------------------------------------------- |
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[363] | 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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[254] | 100 | ; Returns offset to BOOTMENUINFO based on DPT pointer. |
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[100] | 101 | ; |
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[254] | 102 | ; BootMenuInfo_ConvertDPTtoBX |
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[100] | 103 | ; Parameters: |
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[241] | 104 | ; DS:DI: DPT Pointer |
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[100] | 105 | ; Returns: |
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[254] | 106 | ; BX: Offset to BOOTMENUINFO struct |
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[100] | 107 | ; Corrupts registers: |
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[363] | 108 | ; Nothing |
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[100] | 109 | ;-------------------------------------------------------------------- |
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[254] | 110 | BootMenuInfo_ConvertDPTtoBX: |
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[363] | 111 | push ax |
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[241] | 112 | mov ax, di |
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[363] | 113 | sub ax, BYTE RAMVARS_size ; subtract off base of DPTs |
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[254] | 114 | mov bl, DPT_BOOTMENUINFO_SIZE_MULTIPLIER ; BOOTMENUINFO's are a whole number multiple of DPT size |
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[241] | 115 | mul bl |
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[254] | 116 | add ax, BOOTVARS.rgBootNfo ; add base of BOOTMENUINFO |
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[241] | 117 | xchg ax, bx |
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[363] | 118 | pop ax |
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[241] | 119 | ret |
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