source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AHDh_HReset.asm@ 368

Last change on this file since 368 was 363, checked in by aitotat@…, 13 years ago

Changes to XTIDE Universal BIOS:

  • Added Advanced ATA Module (MODULE_ADVANCED_ATA) with native support for QDI Vision QD6500 and QD6580 VLB IDE Controllers.
  • Hopefully optimized IDE transfer functions for 8088 (replaced some memory accesses from WORD to BYTE).
  • XT build does not fit in 8k at the moment!!!
File size: 4.5 KB
Line 
1; Project name : XTIDE Universal BIOS
2; Description : Int 13h function AH=Dh, Reset Hard Disk (Alternate reset).
3
4; Section containing code
5SECTION .text
6
7;--------------------------------------------------------------------
8; Int 13h function AH=Dh, Reset Hard Disk (Alternate reset).
9;
10; AHDh_HandlerForResetHardDisk
11; Parameters:
12; DL: Translated Drive number
13; DS:DI: Ptr to DPT (in RAMVARS segment)
14; SS:BP: Ptr to IDEPACK
15; Returns with INTPACK:
16; AH: Int 13h return status
17; CF: 0 if successful, 1 if error
18;--------------------------------------------------------------------
19ALIGN JUMP_ALIGN
20AHDh_HandlerForResetHardDisk:
21%ifndef USE_186
22 call AHDh_ResetDrive
23 jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
24%else
25 push Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
26 ; Fall to AHDh_ResetDrive
27%endif
28
29
30;--------------------------------------------------------------------
31; Resets hard disk.
32;
33; AHDh_ResetDrive
34; Parameters:
35; DS:DI: Ptr to DPT
36; SS:BP: Ptr to IDEPACK
37; Returns:
38; AH: Int 13h return status
39; CF: 0 if successful, 1 if error
40; Corrupts registers:
41; AL, SI
42;--------------------------------------------------------------------
43AHDh_ResetDrive:
44 push dx
45 push cx
46 push bx
47 push di
48
49 call Interrupts_UnmaskInterruptControllerForDriveInDSDI
50 call Device_ResetMasterAndSlaveController
51 ;jc SHORT .ReturnError ; CF would be set if slave drive present without master
52 ; (error register has special values after reset)
53
54 ; Initialize Master and Slave drives
55 eMOVZX ax, BYTE [di+DPT.bIdevarsOffset] ; (AL) pointer to controller we are looking to reset
56 ; (AH) initialize error code, assume success
57
58 mov si, IterateAndResetDrives ; Callback function for FindDPT_IterateAllDPTs
59 call FindDPT_IterateAllDPTs
60
61 shr ah, 1 ; Move error code and CF into proper position
62
63 pop di
64 pop bx
65 pop cx
66 pop dx
67 ret
68
69;--------------------------------------------------------------------
70; IterateAndResetDrives: Iteration routine for use with IterateAllDPTs.
71;
72; When a drive on the controller is found, it is reset, and the error code
73; merged into overall error code for this controller. Master will be reset
74; first. Note that the iteration will go until the end of the DPT list.
75;
76; Parameters:
77; AL: Offset to IDEVARS for drives to initialize
78; AH: Error status from previous initialization
79; DS:DI: Ptr to DPT to examine
80; Returns:
81; AH: Error status from initialization
82; CF: Set to iterate all DPTs
83; Corrupts registers:
84; AL, BX, DX
85;--------------------------------------------------------------------
86IterateAndResetDrives:
87 cmp al, [di+DPT.bIdevarsOffset] ; The right controller?
88 jne .done
89 push ax
90 push cx
91 call AH9h_InitializeDriveForUse ; Reset Master and Slave (Master will come first in DPT list)
92
93%ifdef MODULE_ADVANCED_ATA
94 jc SHORT .SkipControllerInitSinceError
95 call InitializeAdvancedIdeControllers ; Done after drive init so drives are first set to advanced PIO mode, then the controller
96.SkipControllerInitSinceError:
97%endif
98
99 pop cx
100 pop ax
101 jnc .done
102 or ah, (RET_HD_RESETFAIL << 1) | 1 ; OR in Reset Failed error code and CF, will SHR into position later
103.done:
104 stc ; From IterateAllDPTs perspective, the DPT is never found (continue iteration)
105 ret
106
107
108%ifdef MODULE_ADVANCED_ATA
109;--------------------------------------------------------------------
110; Here we initialize the more advanced controllers (VLB and PCI)
111; to get better performance for systems with 32-bit bus.
112;
113; This step is optional since the controllers use slowest possible
114; settings by default if they are not initialized.
115;
116; InitializeAdvancedIdeController
117; Parameters:
118; DS:DI: Ptr to DPT
119; Returns:
120; CF: Cleared if success or no controller to initialize
121; Set if error
122; Corrupts registers:
123; AX, BX, CX, DX
124;--------------------------------------------------------------------
125InitializeAdvancedIdeControllers:
126 ; We want to initialize the advanced controller only after both
127 ; Master and Slave drive are initialized to correct PIO mode.
128 ; We check if next DPT is for the same IDE controller. If it is,
129 ; we skip the initialization.
130 mov al, [di+DPT.bIdevarsOffset]
131 cmp al, [di++LARGEST_DPT_SIZE+DPT.bIdevarsOffset]
132 je SHORT .SkipInitializationUntilNextDrive ; CF cleared
133
134 jmp AdvAtaInit_InitializeControllerForDPTinDSDI
135.SkipInitializationUntilNextDrive:
136 clc
137 ret
138
139%endif ; MODULE_ADVANCED_ATA
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