source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Initialization/DetectDrives.asm@ 197

Last change on this file since 197 was 196, checked in by gregli@…, 13 years ago

Added printing of COM port and baud rate, when set explicitly by idecfg. Although it eats some bytes, I think it is worth it, since the BIOS will be looking for a server on a particular com port and baud rate, and it could be hard to troubleshoot a mismatch without this information. However, if we become space crunched, this change can be backed out.
File size: 4.6 KB
Line 
1; Project name : XTIDE Universal BIOS
2; Description : Functions for detecting drive for the BIOS.
3
4; Section containing code
5SECTION .text
6
7;--------------------------------------------------------------------
8; Detects all IDE hard disks to be controlled by this BIOS.
9;
10; DetectDrives_FromAllIDEControllers
11; Parameters:
12; DS: RAMVARS segment
13; ES: BDA segment (zero)
14; Returns:
15; Nothing
16; Corrupts registers:
17; All (not segments)
18;--------------------------------------------------------------------
19DetectDrives_FromAllIDEControllers:
20 call RamVars_GetIdeControllerCountToCX
21 mov bp, ROMVARS.ideVars0 ; CS:BP now points to first IDEVARS
22.DriveDetectLoop:
23 mov si, g_szDetect
24%ifdef MODULE_SERIAL
25 cmp byte [cs:bp+IDEVARS.bDevice], DEVICE_SERIAL_PORT
26 jnz .DriveNotSerial
27 mov si, g_szDetectCOM
28.DriveNotSerial:
29%endif
30 call .DetectDrives_WithIDEVARS ; Detect Master and Slave
31 add bp, BYTE IDEVARS_size ; Point to next IDEVARS
32 loop .DriveDetectLoop
33
34%ifdef MODULE_SERIAL
35 test BYTE [es:BDA.bKBFlgs1], 8 ; alt key depressed
36 jz .done
37 mov bp, ROMVARS.ideVarsSerialAuto
38 mov si, g_szDetectCOMAuto
39;;; fall-through
40%else
41 ret
42%endif
43
44;--------------------------------------------------------------------
45; Detects IDE hard disks by using information from IDEVARS.
46;
47; DetectDrives_WithIDEVARS
48; Parameters:
49; CS:BP: Ptr to IDEVARS
50; DS: RAMVARS segment
51; ES: Zero (BDA segment)
52; SI: Ptr to template string
53; Returns:
54; Nothing
55; Corrupts registers:
56; AX, BX, DX, SI, DI
57;--------------------------------------------------------------------
58.DetectDrives_WithIDEVARS:
59 push cx
60
61 push si
62 mov ax, g_szMaster
63 mov bh, MASK_DRVNHEAD_SET ; Select Master drive
64 call StartDetectionWithDriveSelectByteInBHandStringInAX ; Detect and create DPT + BOOTNFO
65 pop si
66
67 mov ax, g_szSlave
68 mov bh, MASK_DRVNHEAD_SET | FLG_DRVNHEAD_DRV
69 call StartDetectionWithDriveSelectByteInBHandStringInAX
70 pop cx
71.done:
72 ret
73
74
75;--------------------------------------------------------------------
76; StartDetectionWithDriveSelectByteInBHandStringInAX
77; Parameters:
78; AX: Offset to "Master" or "Slave" string
79; BH: Drive Select byte for Drive and Head Register
80; CS:BP: Ptr to IDEVARS for the drive
81; DS: RAMVARS segment
82; ES: Zero (BDA segment)
83; Returns:
84; Nothing
85; Corrupts registers:
86; AX, BX, CX, DX, SI, DI
87;--------------------------------------------------------------------
88StartDetectionWithDriveSelectByteInBHandStringInAX:
89 call DetectPrint_StartDetectWithMasterOrSlaveStringInAXandIdeVarsInCSBP
90 ; Fall to .ReadAtaInfoFromHardDisk
91
92;--------------------------------------------------------------------
93; .ReadAtaInfoFromHardDisk
94; Parameters:
95; BH: Drive Select byte for Drive and Head Register
96; CS:BP: Ptr to IDEVARS for the drive
97; DS: RAMVARS segment
98; ES: Zero (BDA segment)
99; Returns:
100; CF: Cleared if ATA-information read successfully
101; Set if any error
102; Corrupts registers:
103; AX, BL, CX, DX, SI, DI
104;--------------------------------------------------------------------
105.ReadAtaInfoFromHardDisk:
106 mov si, BOOTVARS.rgbAtaInfo ; ES:SI now points to ATA info location
107 push es
108 push si
109 push bx
110 call Device_IdentifyToBufferInESSIwithDriveSelectByteInBH
111 pop bx
112 pop si
113 pop es
114 jnc SHORT CreateBiosTablesForHardDisk
115 ; Fall to .ReadAtapiInfoFromDrive
116
117.ReadAtapiInfoFromDrive: ; Not yet implemented
118 ;call ReadAtapiInfoFromDrive ; Assume CD-ROM
119 ;jnc SHORT _CreateBiosTablesForCDROM
120 jmp short DetectDrives_DriveNotFound
121
122
123;--------------------------------------------------------------------
124; CreateBiosTablesForHardDisk
125; Parameters:
126; BH: Drive Select byte for Drive and Head Register
127; CS:BP: Ptr to IDEVARS for the drive
128; ES:SI Ptr to ATA information for the drive
129; DS: RAMVARS segment
130; ES: BDA/Bootnfo segment
131; Returns:
132; Nothing
133; Corrupts registers:
134; AX, BX, CX, DX, SI, DI
135;--------------------------------------------------------------------
136CreateBiosTablesForHardDisk:
137 call CreateDPT_FromAtaInformation
138 jc SHORT DetectDrives_DriveNotFound
139 call BootInfo_CreateForHardDisk
140 jmp short DetectPrint_DriveNameFromBootnfoInESBX
141
142;--------------------------------------------------------------------
143; DetectDrives_DriveNotFound
144; Parameters:
145; Nothing
146; Returns:
147; Nothing
148; Corrupts registers:
149; AX, SI
150;--------------------------------------------------------------------
151DetectDrives_DriveNotFound:
152 mov si, g_szNotFound
153 jmp BootMenuPrint_NullTerminatedStringFromCSSIandSetCF
154
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