source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AHDh_HReset.asm@ 247

Last change on this file since 247 was 200, checked in by gregli@…, 13 years ago

Added logic to skip scanning COM ports if a COM port was already found during the normal detection process, to avoid finding the same serial drive twice and preseting the OS with two drives which in reality point to the same physical file on the server. Also added logic to skip scanning for the slave serial drive if the master was not found. And various small optimizations.
File size: 2.9 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 succesfull, 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; DL: Drive number
36; DS: RAMVARS segment
37; SS:BP: Ptr to IDEPACK
38; Returns:
39; AH: Int 13h return status
40; CF: 0 if succesfull, 1 if error
41; Corrupts registers:
42; AL, CX, SI, DI
43;--------------------------------------------------------------------
44;ALIGN JUMP_ALIGN
45AHDh_ResetDrive:
46 push dx
47 push bx
48
49 call FindDPT_ForDriveNumber ; DS:DI now points to DPT
50 call Interrupts_UnmaskInterruptControllerForDriveInDSDI
51 call Device_ResetMasterAndSlaveController
52 ;jc SHORT .ReturnError ; CF would be set if slave drive present without master
53 ; (error register has special values after reset)
54
55 ; Initialize Master and Slave drives
56 eMOVZX bx, BYTE [di+DPT.bIdevarsOffset]
57 mov dx, [cs:bx+IDEVARS.wPort]
58 call InitializeMasterAndSlaveDriveFromPortInDX
59
60 pop bx
61 pop dx
62 ret
63
64
65;--------------------------------------------------------------------
66; InitializeMasterAndSlaveDriveFromPortInDX
67; Parameters:
68; DX: IDE Base Port address
69; SS:BP: Ptr to IDEPACK
70; Returns:
71; AH: Error code
72; CF: 0 if initialization succesfull
73; 1 if any error
74; Corrupts registers:
75; AL, BX, CX, DX, SI, DI
76;--------------------------------------------------------------------
77ALIGN JUMP_ALIGN
78InitializeMasterAndSlaveDriveFromPortInDX:
79 push dx ; Store base port address
80 xor cx, cx ; Assume no errors
81 FindDPT_ToDSDIForIdeMasterAtPortDX
82 jnc SHORT .InitializeSlave ; Master drive not present
83 call AH9h_InitializeDriveForUse
84 mov cl, ah ; Copy error code to CL
85.InitializeSlave:
86 pop dx ; Restore base port address
87 FindDPT_ToDSDIForIdeSlaveAtPortDX
88 jnc SHORT .CombineErrors ; Slave drive not present
89 call AH9h_InitializeDriveForUse
90 mov ch, ah ; Copy error code to CH
91.CombineErrors:
92 or cl, ch ; OR error codes, clear CF
93 jz SHORT .Return
94 mov ah, RET_HD_RESETFAIL ; Load Reset Failed error code
95 stc
96.Return:
97 ret
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