[277] | 1 | ; Project name : Assembly Library |
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| 2 | ; Description : Serial Server Support, Scan for Server |
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| 3 | ; |
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| 4 | ; This functionality is broken out from SerialServer as it may only be needed during |
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| 5 | ; initialization to find a server, and then could be discarded, (for example the case |
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| 6 | ; of a TSR). |
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| 7 | |
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[376] | 8 | ; |
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[526] | 9 | ; XTIDE Universal BIOS and Associated Tools |
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| 10 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team. |
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[376] | 11 | ; |
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| 12 | ; This program is free software; you can redistribute it and/or modify |
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| 13 | ; it under the terms of the GNU General Public License as published by |
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| 14 | ; the Free Software Foundation; either version 2 of the License, or |
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| 15 | ; (at your option) any later version. |
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[526] | 16 | ; |
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[376] | 17 | ; This program is distributed in the hope that it will be useful, |
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| 18 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 19 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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[526] | 20 | ; GNU General Public License for more details. |
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[376] | 21 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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| 22 | ; |
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| 23 | |
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[526] | 24 | |
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[277] | 25 | %include "SerialServer.inc" |
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[526] | 26 | |
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[277] | 27 | ; Section containing code |
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| 28 | SECTION .text |
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[526] | 29 | |
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[277] | 30 | ;-------------------------------------------------------------------- |
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[526] | 31 | ; SerialServerScan_ScanForServer: |
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[277] | 32 | ; Parameters: |
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[567] | 33 | ; BH: Drive Select byte for Drive and Head Select Register |
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| 34 | ; 0xAx: Scan for drive, low nibble indicates drive |
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| 35 | ; 0x0: Scan for Server, independent of drives |
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[277] | 36 | ; DX: Port and Baud to Scan for |
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| 37 | ; 0: Scan a known set of ports and bauds |
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| 38 | ; ES:SI: Ptr to buffer for return |
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| 39 | ; Returns: |
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| 40 | ; CF: Cleared if success, Set if error |
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| 41 | ; Corrupts registers: |
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| 42 | ; AL, BX, CX, DX, DI |
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| 43 | ;-------------------------------------------------------------------- |
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[526] | 44 | SerialServerScan_ScanForServer: |
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[277] | 45 | mov cx, 1 ; one sector, not scanning (default) |
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| 46 | |
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| 47 | test dx, dx |
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[589] | 48 | jnz SHORT SerialServerScan_CheckForServer_PortAndBaudInDX |
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[277] | 49 | |
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[589] | 50 | mov di, .scanPortAddresses-1 |
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| 51 | mov ch, 1 ; tell server that we are scanning |
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[277] | 52 | |
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| 53 | .nextPort: |
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| 54 | inc di ; load next port address |
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[589] | 55 | mov dh, 40h ; Clear DH and make sure CF is set if error |
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| 56 | mov dl, [cs:di] |
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[277] | 57 | eSHL_IM dx, 2 ; shift from one byte to two |
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[589] | 58 | jz SHORT .error |
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[277] | 59 | |
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| 60 | ; |
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| 61 | ; Test for COM port presence, write to and read from registers |
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| 62 | ; |
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| 63 | push dx |
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[589] | 64 | add dl, Serial_UART_lineControl |
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| 65 | mov al, 9Ah |
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[277] | 66 | out dx, al |
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| 67 | in al, dx |
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| 68 | pop dx |
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[589] | 69 | cmp al, 9Ah |
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| 70 | jne SHORT .nextPort |
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[277] | 71 | |
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[589] | 72 | mov al, 0Ch |
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[277] | 73 | out dx, al |
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| 74 | in al, dx |
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[589] | 75 | cmp al, 0Ch |
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| 76 | jne SHORT .nextPort |
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[277] | 77 | |
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| 78 | ; |
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| 79 | ; Begin baud rate scan on this port... |
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| 80 | ; |
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| 81 | ; On a scan, we support 6 baud rates, starting here and going higher by a factor of two each step, with a |
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| 82 | ; small jump between 9600 and 38800. These 6 were selected since we wanted to support 9600 baud and 115200, |
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| 83 | ; *on the server side* if the client side had a 4x clock multiplier, a 2x clock multiplier, or no clock multiplier. |
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| 84 | ; |
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[589] | 85 | ; Starting with 30h, that means 30h (2400 baud), 18h (4800 baud), 0Ch (9600 baud), and |
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[277] | 86 | ; 04h (28800 baud), 02h (57600 baud), 01h (115200 baud) |
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| 87 | ; |
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[589] | 88 | ; Note: hardware baud multipliers (2x, 4x, 8x) will impact the final baud rate and are not known at this level |
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[277] | 89 | ; |
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[589] | 90 | mov dh, 30h * 2 ; multiply by 2 since we are about to divide by 2 |
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| 91 | mov dl, [cs:di] ; restore single byte port address for scan |
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[277] | 92 | |
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| 93 | .nextBaud: |
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[589] | 94 | shr dh, 1 |
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| 95 | jz SHORT .nextPort |
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| 96 | cmp dh, 6 ; skip from 6 to 4, to move from the top of the 9600 baud range |
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| 97 | jne SHORT .testBaud ; to the bottom of the 115200 baud range |
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| 98 | mov dh, 4 |
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[277] | 99 | |
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| 100 | .testBaud: |
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| 101 | call SerialServerScan_CheckForServer_PortAndBaudInDX |
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[589] | 102 | jc SHORT .nextBaud |
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[277] | 103 | |
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[526] | 104 | .error: |
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[277] | 105 | ret |
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| 106 | |
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| 107 | .scanPortAddresses: db SERIAL_COM7_IOADDRESS >> 2 |
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| 108 | db SERIAL_COM6_IOADDRESS >> 2 |
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| 109 | db SERIAL_COM5_IOADDRESS >> 2 |
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| 110 | db SERIAL_COM4_IOADDRESS >> 2 |
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| 111 | db SERIAL_COM3_IOADDRESS >> 2 |
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| 112 | db SERIAL_COM2_IOADDRESS >> 2 |
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| 113 | db SERIAL_COM1_IOADDRESS >> 2 |
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| 114 | db 0 |
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| 115 | |
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[526] | 116 | |
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[277] | 117 | ;-------------------------------------------------------------------- |
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| 118 | ; SerialServer_CheckForServer_PortAndBaudInDX: |
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| 119 | ; Parameters: |
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[567] | 120 | ; BH: Drive Select byte for Drive and Head Select Register |
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| 121 | ; 0xAx: Scan for drive, low nibble indicates drive |
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| 122 | ; 0x0: Scan for Server, independent of drives |
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[277] | 123 | ; DX: Baud and Port |
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| 124 | ; CH: 1: We are doing a scan for the serial server |
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[567] | 125 | ; 0: We are working off a specific port given by the user |
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[277] | 126 | ; CL: 1, for one sector to read |
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| 127 | ; ES:SI: Ptr to buffer for return |
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| 128 | ; Returns: |
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| 129 | ; AH: INT 13h Error Code |
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| 130 | ; CF: Cleared if success, Set if error |
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| 131 | ; Corrupts registers: |
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| 132 | ; AL, BX |
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| 133 | ;-------------------------------------------------------------------- |
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| 134 | SerialServerScan_CheckForServer_PortAndBaudInDX: |
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| 135 | push bp ; setup fake SerialServer_Command |
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| 136 | push dx ; send port baud and rate, returned in inquire packet |
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| 137 | ; (and possibly returned in the drive identification string) |
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| 138 | push cx ; send number of sectors, and if it is on a scan or not |
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[589] | 139 | mov bl, SerialServer_Command_Inquire ; protocol command onto stack with bh |
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[277] | 140 | push bx |
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| 141 | |
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[589] | 142 | mov bp, sp |
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[277] | 143 | call SerialServer_SendReceive |
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| 144 | |
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| 145 | pop bx |
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| 146 | pop cx |
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| 147 | pop dx |
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| 148 | pop bp |
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| 149 | |
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| 150 | ret |
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| 151 | |
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