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Annotation of ntddk/src/vdd/com_vdd/com_vdd.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Com_VDD.c - Windows NT serial port Virtual Device Driver
        !             3:  *
        !             4:  * This module handles the init/exit of the VDD.
        !             5:  *
        !             6:  * copyright 1992 by Microsoft Corporation
        !             7:  *
        !             8:  * revision history:
        !             9:  *  24-Dec-1992 John Morgan:  written
        !            10:  *
        !            11:  */
        !            12: 
        !            13: #include "com_vdd.h"
        !            14: #include "pc_com.h"
        !            15: #include "nt_com.h"
        !            16: 
        !            17: #include <vddsvc.h>
        !            18: 
        !            19: /*
        !            20:  *
        !            21:  * VDDInitialize
        !            22:  *
        !            23:  * Arguments:
        !            24:  *     DllHandle - Identifies this VDD
        !            25:  *     Reason - Attach or Detach
        !            26:  *     Context - Not Used
        !            27:  *
        !            28:  * Return Value:
        !            29:  *     TRUE: SUCCESS
        !            30:  *     FALSE: FAILURE
        !            31:  *
        !            32:  */
        !            33: BOOL VDDInitialize(
        !            34:     IN PVOID DllHandle,
        !            35:     IN ULONG Reason,
        !            36:     IN PCONTEXT Context OPTIONAL
        !            37:     )
        !            38: {
        !            39:     VDD_IO_PORTRANGE PortDefs[NUM_SERIAL_PORTS] = {
        !            40:         {0x3F8, 0x3FF},
        !            41:         {0x2F8, 0x2FF},
        !            42:         {0x3E8, 0x3EF},
        !            43:         {0x2E8, 0x2EF}
        !            44:     };
        !            45: 
        !            46:     VDD_IO_HANDLERS PortHandlers[NUM_SERIAL_PORTS] = {
        !            47:         {com_inb, NULL, NULL, NULL, com_outb, NULL, NULL, NULL},
        !            48:         {com_inb, NULL, NULL, NULL, com_outb, NULL, NULL, NULL},
        !            49:         {com_inb, NULL, NULL, NULL, com_outb, NULL, NULL, NULL},
        !            50:         {com_inb, NULL, NULL, NULL, com_outb, NULL, NULL, NULL}
        !            51:     };
        !            52: 
        !            53:     switch ( Reason ) {
        !            54: 
        !            55:     case DLL_PROCESS_ATTACH:
        !            56:         host_com_init();
        !            57: 
        !            58:         // Attach inb & outb functions to correct ports
        !            59:         VDDInstallIOHook(DllHandle, 4, PortDefs, PortHandlers);
        !            60: 
        !            61:         break;
        !            62: 
        !            63:     case DLL_PROCESS_DETACH:
        !            64:         // Free comm ports
        !            65:         VDDDeInstallIOHook(DllHandle, 4, PortDefs);
        !            66: 
        !            67:         host_com_exit();
        !            68: 
        !            69:         break;
        !            70: 
        !            71:     default:
        !            72:         break;
        !            73:     }
        !            74: 
        !            75:     return TRUE;
        !            76: }
        !            77: 
        !            78: 
        !            79: /*
        !            80:  *
        !            81:  * VDDTerminateVDM
        !            82:  *
        !            83:  */
        !            84: VOID VDDTerminateVDM( VOID )
        !            85: {
        !            86:     return;
        !            87: }
        !            88: 
        !            89: 
        !            90: /*
        !            91:  *
        !            92:  * VDDInit
        !            93:  *
        !            94:  */
        !            95: VOID VDDInit( VOID )
        !            96: {
        !            97: 
        !            98:     // Called from the BOP manager. If VDDInitialize has done all the
        !            99:     // checking and resources alloaction, just return success.
        !           100: 
        !           101:     setCF( 0 );
        !           102: 
        !           103:     return;
        !           104: }
        !           105: 
        !           106: 
        !           107: /*
        !           108:  *
        !           109:  * VDDDispatch
        !           110:  *
        !           111:  * Arguments:
        !           112:  *     Client (DX)    = Address / command code
        !           113:  *                       This is essentially an extended port number.  The
        !           114:  *                       lowest hex digit identifies a function, while the
        !           115:  *                       upper two digits identify the port base address.
        !           116:  *                      Command 0 is send buffer. It writes CX
        !           117:  *                       characters from the buffer at DS:SI.
        !           118:  *                      Command 1 is read buffer. It reads up to
        !           119:  *                       CX characters into the buffer at ES:DI. CX is
        !           120:  *                       returned as the number of characters read.
        !           121:  *                      Command 7 is set baud rate.  It sets the baud
        !           122:  *                       rate as passed in CX.
        !           123:  *                      Commands 8-F access the virtual UART registers.
        !           124:  *                       CX indicates how the register is to be changed.
        !           125:  *                       CH indicates which bits to clear in the register,
        !           126:  *                       while CL indicates which bits to complement. If
        !           127:  *                       CX = 0 the register is read but not written. If
        !           128:  *                       CH = 0xFF the value in CL is written to the register.
        !           129:  *                       In all other cases the register is both read and
        !           130:  *                       written to.  CL is always set to the value written
        !           131:  *                       to the register if any, or the value read if not.
        !           132:  *                       Note that 0 is always THR/RBR and 1 is IER.
        !           133:  *                       Use command 7 to change the baud rate.
        !           134:  *
        !           135:  *     Client (CX)    = Port Data or Buffer Size
        !           136:  *     Client (DS:SI) = Read Message Buffer
        !           137:  *     Client (ES:DI) = Send Message Buffer
        !           138:  *
        !           139:  * Return Value:
        !           140:  *     Client Carry Clear:  SUCCESS
        !           141:  *     Client Carry Set:    FAILURE
        !           142:  * 
        !           143:  */
        !           144: VOID VDDDispatch( VOID )
        !           145: {
        !           146:     USHORT  PortCommand;
        !           147:     PCHAR   Buffer;
        !           148:     tAdapter adapter;
        !           149:     USHORT  PassCX;
        !           150:     BYTE    temp;
        !           151: 
        !           152:     setCF( 0 );                         // Assume success
        !           153: 
        !           154:     PortCommand = getDX();
        !           155:     adapter = adapter_for_port( (PortCommand & ~0xF) | 8 );
        !           156: 
        !           157:     if (adapter < 0 || adapter >= NUM_SERIAL_PORTS) {
        !           158:         setCF( 1 );                     // ERROR: unknown serial port
        !           159:     }
        !           160:     else {
        !           161:         PassCX = getCX();               // all commands us CX
        !           162:         switch (PortCommand & 0xF) {
        !           163:         case 0: // Write buffer
        !           164:             Buffer = (PCHAR) GetVDMPointer((ULONG)(getDS()<<16|getSI()),PassCX,FALSE);
        !           165:             break;
        !           166:         case 1: // Read buffer
        !           167:             Buffer = (PCHAR) GetVDMPointer((ULONG)(getES()<<16|getDI()),PassCX,FALSE);
        !           168:             break;
        !           169:         case 7: // Set baud rate
        !           170:             break;
        !           171:         case 8:  // THR & RBR
        !           172:         case 9:  // IED
        !           173:         case 10: // IIR
        !           174:         case 11: // LCR
        !           175:         case 12: // MCR
        !           176:         case 13: // LSR
        !           177:         case 14: // MSR
        !           178:         case 15: // SCR
        !           179:             if (PassCX == 0)
        !           180:             {
        !           181:                 com_inb( PortCommand, &temp );
        !           182:                 // do not write to port
        !           183:                 setCL( temp );
        !           184:             }
        !           185:             else if (PassCX & 0xFF00 == 0xFF00)
        !           186:             {
        !           187:                 // do not read from port
        !           188:                 com_outb( PortCommand, (BYTE) PassCX );
        !           189:             }
        !           190:             else
        !           191:             {
        !           192:                 com_inb( PortCommand, &temp );
        !           193:                 temp = (BYTE)((temp & ~(PassCX >> 8)) ^ PassCX);
        !           194:                 com_outb( PortCommand, temp );
        !           195:                 setCL( temp );
        !           196:             }
        !           197:             break;
        !           198:         default: // unknown command
        !           199:             break;
        !           200:         }
        !           201:     }
        !           202: 
        !           203:     return;
        !           204: }
        !           205: 

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