source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Initialization/DetectPrint.asm@ 235

Last change on this file since 235 was 235, checked in by gregli@…, 13 years ago

More fun with comments, restoring a comment change that was lost in the mass checkin earlier and adding a little more information for another.

File size: 4.8 KB
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1; Project name : XTIDE Universal BIOS
2; Description : Functions for printing drive detection strings.
3
4; Section containing code
5SECTION .text
6
7;--------------------------------------------------------------------
8; Prints BIOS name and segment address where it is found.
9;
10; DetectPrint_RomFoundAtSegment
11; Parameters:
12; Nothing
13; Returns:
14; Nothing
15; Corrupts registers:
16; AX, SI, DI
17;--------------------------------------------------------------------
18DetectPrint_RomFoundAtSegment:
19 push bp
20 mov bp, sp
21 mov si, g_szRomAt
22 ePUSH_T ax, ROMVARS.szTitle ; Bios title string
23 push cs ; BIOS segment
24
25DetectPrint_BootMenuPrint_FormatCSSIfromParamsInSSBP_Relay:
26 jmp BootMenuPrint_FormatCSSIfromParamsInSSBP
27
28
29;--------------------------------------------------------------------
30; DetectPrint_StartDetectWithMasterOrSlaveStringInAXandIdeVarsInCSBP
31; Parameters:
32; CS:CX: Ptr to "Master" or "Slave" string
33; CS:BP: Ptr to IDEVARS
34; SI: Ptr to template string
35; Returns:
36; Nothing
37; Corrupts registers:
38; AX, SI, DI, CX
39;--------------------------------------------------------------------
40DetectPrint_StartDetectWithMasterOrSlaveStringInAXandIdeVarsInCSBP:
41
42 mov ax, [cs:bp+IDEVARS.wPort] ; for IDE: AX=port address, DH=.bDevice
43 mov dx, [cs:bp+IDEVARS.bDevice-1] ; for Serial: AL=port address>>2, AH=baud rate
44 ; DL=COM number character, DH=.bDevice
45
46 push bp ; setup stack for call to
47 mov bp, sp ; BootMenuPrint_FormatCSSIfromParamsInSSBP
48
49 push cx ; Push "Master" or "Slave"
50
51 mov cl, (g_szDetectPort-$$) & 0xff ; Setup print string for standard IDE
52 ; Note that we modify only the low order bits of CX a lot here,
53 ; saving code space rather than reloading CX completely.
54 ; This optimization requires that all the g_szDetect* strings are
55 ; on the same 256 byte page, which is checked in strings.asm.
56
57 cmp dx, DEVICE_SERIAL_PORT << 8 ; Check if this is a serial device,
58 ; And also check if DL is zero, check with the jz below
59 ; This optimization requires that DEVICE_SERIAL_PORT be
60 ; the highest value in the DEVICE_* series, ensuring that
61 ; anything less in the high order bits is a different device.
62
63 jl .pushAndPrint ; CX = string to print, AX = port address, DX won't be used
64
65 mov cl, (g_szDetectCOM-$$) & 0xff ; Setup print string for COM ports
66 push cx ; And push now. We use the fact that format strings can contain
67 ; themselves format strings.
68
69 push dx ; Push COM number character
70 ; If the strnig is going to be "Auto", we will push a NULL (zero)
71 ; here for the COM port number, which will be eaten by the
72 ; print routine (DisplayPrint_CharacterFromAL), resulting in
73 ; just "COM" being printed without a character after it.
74
75 mov cl, (g_szDetectCOMAuto-$$) & 0xff ; Setup secondary print string for "Auto"
76
77 jz .pushAndPrint ; CX = string to print, AX and DX won't be used
78
79 mov cl, (g_szDetectCOMLarge-$$) & 0xff ; Setup secondary print string for "COMn/xx.yK"
80
81 mov al,ah ; baud rate divisor to AL
82 cbw ; clear AH, AL will always be less than 128
83 xchg si,ax ; move AX to SI for divide
84 mov ax,1152 ; baud rate to displa is 115200/divisor, the "00" is handled
85 ; in the print strings
86 xor dx,dx ; clear top 16-bits of dividend
87 div si ; and divide... Now AX = baud rate/100, DX = 0 (always a clean divide)
88
89 mov si,10 ; Now separate the whole portion from the fractional for "K" display
90 div si ; and divide... Now AX = baud rate/1000, DX = low order digit
91
92 cmp ax,si ; <= 10: "2400", "9600", etc.; >10: "19.2K", "38.4K", etc.
93 jae .pushAndPrint
94
95 mov cl, (g_szDetectCOMSmall-$$) & 0xff ; Setup secondary print string for "COMn/XXy00"
96
97.pushAndPrint:
98 push cx ; Push print string
99 push ax ; Push high order digits, or port address, or N/A
100 push dx ; Push low order digit, or N/A
101
102 mov si, g_szDetectOuter ; Finally load SI with wrapper string "IDE %s at %s: "
103
104 jmp short DetectPrint_BootMenuPrint_FormatCSSIfromParamsInSSBP_Relay
105
106
107;--------------------------------------------------------------------
108; DetectPrint_DriveNameFromBootnfoInESBX
109; Parameters:
110; ES:BX: Ptr to BOOTNFO (if drive found)
111; Returns:
112; Nothing
113; Corrupts registers:
114; AX, SI
115;--------------------------------------------------------------------
116DetectPrint_DriveNameFromBootnfoInESBX:
117 push di
118 push bx
119
120 lea si, [bx+BOOTNFO.szDrvName]
121 mov bx, es
122 CALL_DISPLAY_LIBRARY PrintNullTerminatedStringFromBXSI
123 CALL_DISPLAY_LIBRARY PrintNewlineCharacters
124
125 pop bx
126 pop di
127 ret
128
129
130
131
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