source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH9h_HInit.asm@ 3

Last change on this file since 3 was 3, checked in by Tomi Tilli, 15 years ago
File size: 4.3 KB
Line 
1; File name : AH9h_HInit.asm
2; Project name : IDE BIOS
3; Created date : 9.12.2007
4; Last update : 26.4.2010
5; Author : Tomi Tilli
6; Description : Int 13h function AH=9h, Initialize Drive Parameters.
7
8; Section containing code
9SECTION .text
10
11;--------------------------------------------------------------------
12; Int 13h function AH=9h, Initialize Drive Parameters.
13;
14; AH9h_HandlerForInitializeDriveParameters
15; Parameters:
16; AH: Bios function 9h
17; DL: Drive number
18; Parameters loaded by Int13h_Jump:
19; DS: RAMVARS segment
20; Returns:
21; AH: Int 13h return status
22; CF: 0 if succesfull, 1 if error
23; IF: 1
24; Corrupts registers:
25; Flags
26;--------------------------------------------------------------------
27ALIGN JUMP_ALIGN
28AH9h_HandlerForInitializeDriveParameters:
29 push dx
30 push cx
31 push bx
32 push ax
33 call AH9h_InitializeDriveForUse
34 jmp Int13h_PopXRegsAndReturn
35
36
37;--------------------------------------------------------------------
38; Initialized drive to be ready for use.
39;
40; AH9h_InitializeDriveForUse
41; Parameters:
42; DL: Drive number
43; DS: RAMVARS segment
44; Returns:
45; DS:DI: Ptr to DPT
46; AH: Int 13h return status
47; CF: 0 if succesfull, 1 if error
48; Corrupts registers:
49; AL, BX
50;--------------------------------------------------------------------
51ALIGN JUMP_ALIGN
52AH9h_InitializeDriveForUse:
53 push dx
54 push cx
55
56 ; Try to select drive and wait until ready
57 call FindDPT_ForDriveNumber
58 or BYTE [di+DPT.bReset], MASK_RESET_ALL ; Everything uninitialized
59 call HDrvSel_SelectDriveAndDisableIRQ
60 jc SHORT .ReturnNotSuccessfull
61 and BYTE [di+DPT.bReset], ~FLG_RESET_nDRDY ; Clear since success
62
63 ; Initialize CHS parameters if LBA is not used
64 call AH9h_InitializeDeviceParameters
65 jc SHORT .RecalibrateDrive
66 and BYTE [di+DPT.bReset], ~FLG_RESET_nINITPRMS
67
68 ; Recalibrate drive by seeking to cylinder 0
69ALIGN JUMP_ALIGN
70.RecalibrateDrive:
71 call AH11h_RecalibrateDrive
72 mov dl, [di+DPT.bDrvNum] ; Restore DL
73 jc SHORT .InitializeBlockMode
74 and BYTE [di+DPT.bReset], ~FLG_RESET_nRECALIBRATE
75
76 ; Initialize block mode transfers
77ALIGN JUMP_ALIGN
78.InitializeBlockMode:
79 call AH9h_InitializeBlockMode
80 ;mov dl, [di+DPT.bDrvNum] ; Restore DL
81 jc SHORT .ReturnNotSuccessfull
82 and BYTE [di+DPT.bReset], ~FLG_RESET_nSETBLOCK
83
84.ReturnNotSuccessfull:
85 pop cx
86 pop dx
87 ret
88
89
90;--------------------------------------------------------------------
91; Sends Initialize Device Parameters command to IDE Hard Disk.
92; Initialization is used to initialize logical CHS parameters. Drives
93; may not support all CHS values.
94; This command is only supported by drives that supports CHS addressing.
95;
96; AH9h_InitializeDeviceParameters
97; Parameters:
98; DS:DI: Ptr to DPT
99; Returns:
100; AH: BIOS Error code
101; CF: Cleared if succesfull
102; Set if any error
103; Corrupts registers:
104; AL, BX, CX
105;--------------------------------------------------------------------
106ALIGN JUMP_ALIGN
107AH9h_InitializeDeviceParameters:
108 ; No need to initialize CHS parameters if LBA mode enabled
109 test BYTE [di+DPT.bDrvSel], FLG_IDE_DRVHD_LBA ; Clears CF
110 jnz SHORT .Return
111
112 push dx
113 mov bh, [di+DPT.bPHeads]
114 dec bh ; Max head number
115 mov dx, [RAMVARS.wIdeBase]
116 call HCommand_OutputTranslatedLCHSaddress
117 mov ah, HCMD_INIT_DEV
118 mov al, [di+DPT.bPSect] ; Sectors per track
119 call HCommand_OutputSectorCountAndCommand
120 call HStatus_WaitBsyDefTime ; Wait until drive ready (DRDY won't be set!)
121 pop dx
122.Return:
123 ret
124
125
126;--------------------------------------------------------------------
127; Initializes block mode transfers.
128;
129; AH9h_InitializeBlockMode
130; Parameters:
131; DL: Drive number
132; DS:DI: Ptr to DPT
133; Returns:
134; AH: BIOS Error code
135; CF: Cleared if succesfull
136; Set if any error
137; Corrupts registers:
138; AL, BX, CX, DX
139;--------------------------------------------------------------------
140ALIGN JUMP_ALIGN
141AH9h_InitializeBlockMode:
142 mov ax, FLG_DRVPARAMS_BLOCKMODE
143 call AccessDPT_TestIdeVarsFlagsForMasterOrSlaveDrive
144 jz SHORT .Return ; Block mode disabled (CF cleared)
145 eMOVZX ax, BYTE [di+DPT.bMaxBlock] ; Load max block size, zero AH
146 test al, al ; Block mode supported? (clears CF)
147 jz SHORT .Return ; If not, return
148 jmp AH24h_SetBlockSize
149.Return:
150 ret
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