source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Device/Serial/SerialCommand.asm@ 376

Last change on this file since 376 was 376, checked in by gregli@…, 13 years ago

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1; Project name : XTIDE Universal BIOS
2; Description : Serial Device Command functions.
3
4;
5; XTIDE Universal BIOS and Associated Tools
6; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team.
7;
8; This program is free software; you can redistribute it and/or modify
9; it under the terms of the GNU General Public License as published by
10; the Free Software Foundation; either version 2 of the License, or
11; (at your option) any later version.
12;
13; This program is distributed in the hope that it will be useful,
14; but WITHOUT ANY WARRANTY; without even the implied warranty of
15; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16; GNU General Public License for more details.
17; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
18;
19
20; Section containing code
21SECTION .text
22
23%define SERIALSERVER_AH_ALREADY_HAS_COMMAND_BYTE
24%define SERIALSERVER_NO_ZERO_SECTOR_COUNTS
25
26;--------------------------------------------------------------------
27; SerialCommand_OutputWithParameters
28; Parameters:
29; BH: Non-zero if 48-bit addressing used
30; (ignored at present as 48-bit addressing is not supported)
31; BL: IDE Status Register bit to poll after command
32; (ignored at present, since there is no IDE status register to poll)
33; ES:SI: Ptr to buffer (for data transfer commands)
34; DS:DI: Ptr to DPT (in RAMVARS segment)
35; SS:BP: Ptr to IDEREGS_AND_INTPACK
36; Returns:
37; AH: INT 13h Error Code
38; CX: Number of successfully transferred sectors (for transfer commands)
39; CF: Cleared if success, Set if error
40; Corrupts registers:
41; AL, BX, CX, DX, (ES:SI for data transfer commands)
42;--------------------------------------------------------------------
43ALIGN JUMP_ALIGN
44SerialCommand_OutputWithParameters:
45
46 mov ah,SerialServer_Command_Read
47
48 mov al,[bp+IDEPACK.bCommand]
49
50 cmp al,20h ; Read Sectors IDE command
51 jz .readOrWrite
52 inc ah ; now SerialServer_Protocol_Write
53 cmp al,30h ; Write Sectors IDE command
54 jz .readOrWrite
55
56; all other commands return success
57; including function 0ech which should return drive information, this is handled with the identify functions
58;
59 xor ah,ah ; also clears carry
60 ret
61
62.readOrWrite:
63 mov [bp+IDEPACK.bFeatures],ah ; store protocol command
64
65 mov dx, [di+DPT_SERIAL.wSerialPortAndBaud]
66
67ALIGN JUMP_ALIGN
68SerialCommand_FallThroughToSerialServer_SendReceive:
69
70%include "SerialServer.asm"
71
72%ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
73 %if SerialCommand_FallThroughToSerialServer_SendReceive <> SerialServer_SendReceive
74 %error "SerialServer_SendReceive must be the first routine at the top of SerialServer.asm in the Assembly_Library"
75 %endif
76%endif
77
78ALIGN JUMP_ALIGN
79SerialCommand_ReturnError:
80 stc
81 ret
82
83;--------------------------------------------------------------------
84; SerialCommand_IdentifyDeviceToBufferInESSIwithDriveSelectByteInBH
85; Parameters:
86; BH: Drive Select byte for Drive and Head Select Register
87; DS: Segment to RAMVARS
88; ES:SI: Ptr to buffer to receive 512-byte IDE Information
89; CS:BP: Ptr to IDEVARS
90; Returns:
91; CF: Cleared if success, Set if error
92; Corrupts registers:
93; AL, BL, CX, DX, SI, DI, ES
94;--------------------------------------------------------------------
95ALIGN JUMP_ALIGN
96SerialCommand_IdentifyDeviceToBufferInESSIwithDriveSelectByteInBH:
97;
98; To improve boot time, we do our best to avoid looking for slave serial drives when we already know the results
99; from the looking for a master. This is particularly true when doing a COM port scan, as we will end up running
100; through all the COM ports and baud rates a second time.
101;
102; But drive detection isn't the only case - we also need to get the right drive when called on int13h/25h.
103;
104; The decision tree:
105;
106; Master:
107; wSerialPortAndBaud Non-Zero: -> Continue with wSerialPortAndBaud (1)
108; wSerialPortAndBaud Zero:
109; previous serial drive not found: -> Scan (2)
110; previous serial drive found: -> Continue with previous serial drive info (3)
111;
112; Slave:
113; wSerialPortAndBaud Non-Zero:
114; previous serial drive not found: -> Error - Not Found (4)
115; previous serial drive found: -> Continue with wSerialPackedAndBaud (5)
116; wSerialPortAndBaud Zero:
117; previous serial drive not found: -> Error - Not Found (4)
118; previous serial drive found: -> Continue with previous serial drive info (6)
119;
120; (1) This was a port/baud that was explicitly set with the configurator. In the drive detection case, as this
121; is the Master, we are checking out a new controller, and so don't care if we already have a serial drive.
122; And as with the int13h/25h case, we just go off and get the needed information using the user's setting.
123; (2) We are using the special .ideVarsSerialAuto structure. During drive detection, we would only be here
124; if we hadn't already seen a serial drive (since we only scan if no explicit drives are set),
125; so we go off to scan.
126; (3) We are using the special .ideVarsSerialAuto structure. We won't get here during drive detection, but
127; we might get here on an int13h/25h call. If we have scanned COM drives, they are the ONLY serial drives
128; in use, and so we use the values from the previously seen serial drive DPT.
129; (4) No master has been found yet, therefore no slave should be found. Avoiding the slave reduces boot time,
130; especially in the full COM port scan case. Note that this is different from the hardware IDE, where we
131; will scan for a slave even if a master is not present. Note that if ANY master had been previously found,
132; we will do the slave scan, which isn't harmful, it just wastes time. But the most common case (by a wide
133; margin) will be just one serial controller.
134; (5) A COM port scan for a master had been previously completed, and a drive was found. In a multiple serial
135; controller scenario being called with int13h/25h, we need to use the value in bSerialPackedPortAndBaud
136; to make sure we get the proper drive.
137; (6) A COM port scan for a master had been previously completed, and a drive was found. We would only get here
138; if no serial drive was explicitly set by the user in the configurator or that drive had not been found.
139; Instead of performing the full COM port scan for the slave, use the port/baud value stored during the
140; master scan.
141;
142 mov dx,[cs:bp+IDEVARS.wSerialPortAndBaud]
143 xor ax,ax
144
145 push si
146 call FindDPT_ToDSDIforSerialDevice
147 pop si
148%ifdef MODULE_SERIAL_FLOPPY
149 jnc .founddpt
150;
151; If not found above with FindDPT_ToDSDIforSerialDevice, DI will point to the DPT after the last hard disk DPT
152; So, if there was a previously found floppy disk, DI will point to that DPT and we use that value for the slave.
153;
154 cmp byte [RAMVARS.xlateVars+XLATEVARS.bFlopCntAndFirst], 0
155 jz .notfounddpt
156.founddpt:
157%else
158 jc .notfounddpt
159%endif
160 mov ax, [di+DPT_SERIAL.wSerialPortAndBaud]
161.notfounddpt:
162
163 test bh, FLG_DRVNHEAD_DRV
164 jz .master
165
166 test ax,ax ; Take care of the case that is different between master and slave.
167 jz SerialCommand_ReturnError
168
169; fall-through
170.master:
171 test dx,dx
172 jnz .identifyDeviceInDX
173
174 xchg dx, ax ; move ax to dx (move previously found serial drive to dx, could be zero)
175
176.identifyDeviceInDX:
177
178ALIGN JUMP_ALIGN
179SerialCommand_FallThroughToSerialServerScan_ScanForServer:
180
181%include "SerialServerScan.asm"
182
183%ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
184 %if SerialCommand_FallThroughToSerialServerScan_ScanForServer <> SerialServerScan_ScanForServer
185 %error "SerialServerScan_ScanForServer must be the first routine at the top of SerialServerScan.asm in the Assembly_Library"
186 %endif
187%endif
188
189
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