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Annotation of kernel/bsd/dev/ppc/drvPPCATA/IdeCntInline.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: // Copyright 1997 by Apple Computer, Inc., all rights reserved.
        !            26: /*
        !            27:  * Copyright (c) 1991-1997 NeXT Software, Inc.  All rights reserved. 
        !            28:  *
        !            29:  * IdeCntInline.h - included by IdeCnt.m -- misc functions
        !            30:  *
        !            31:  * HISTORY 
        !            32:  */
        !            33: 
        !            34: 
        !            35: #import <driverkit/kernelDriver.h>
        !            36: #import "io_inline.h"
        !            37: 
        !            38: 
        !            39: static __inline__
        !            40: void 
        !            41: rwBuffer(caddr_t addr, BOOL read, unsigned length, unsigned ideDataRegister)
        !            42: {
        !            43:     unsigned int len = length;
        !            44:     unsigned short *dst;
        !            45:     
        !            46:     dst = (unsigned short *)addr;
        !            47:     length /= 2;
        !            48:     
        !            49:     if (read) 
        !            50:     {
        !            51:        while (length-- > 0)
        !            52:            *dst++ = inw(ideDataRegister);
        !            53:     } 
        !            54:     else 
        !            55:     {
        !            56:        while (length-- > 0)
        !            57:            outw(ideDataRegister, *dst++);
        !            58:     }
        !            59:     
        !            60:     if (len % 2 == 0)
        !            61:        return;
        !            62: 
        !            63:     /*
        !            64:      * Extra byte. This can happen for ATAPI I/O requests.
        !            65:      */
        !            66:     if (read) 
        !            67:     {
        !            68:        *(unsigned char *)dst = inw(ideDataRegister);
        !            69:     } 
        !            70:     else 
        !            71:     {
        !            72:        outw(ideDataRegister, * (unsigned char *)dst);
        !            73:     }
        !            74: }
        !            75: 
        !            76: /*
        !            77:  * Note: length is <= PAGE_SIZE while calling this function. If a request is
        !            78:  * of odd size and is split over two pages then we always make the second one
        !            79:  * odd sized. 
        !            80:  */
        !            81: 
        !            82: static  __inline__
        !            83: void    
        !            84: ideXferData(caddr_t addr, BOOL read, struct vm_map *client,
        !            85:            unsigned length, ideRegsAddrs_t ideRegs )
        !            86: {
        !            87:     unsigned count,            offset;
        !            88:     unsigned short             sw;
        !            89:     extern struct vm_map       *kernel_map;
        !            90:     u_int32_t                  maddr0, maddr1; 
        !            91:     vm_address_t               xaddr0, xaddr1;
        !            92: 
        !            93:     /*
        !            94:      * Simple case, no mapping required. 
        !            95:      */
        !            96:     if (client == kernel_map) 
        !            97:     {
        !            98:         rwBuffer(addr, read, length, ideRegs.data);
        !            99:        return;
        !           100:     }
        !           101: 
        !           102:     offset = (unsigned)addr & (PAGE_SIZE - 1);
        !           103: 
        !           104:     IOPhysicalFromVirtual( (vm_task_t)client, (vm_address_t)addr, &maddr0 );
        !           105:     maddr0 = trunc_page(maddr0);
        !           106: 
        !           107:     if ((PAGE_SIZE - offset) < length)                 /* this is a pain */
        !           108:     {
        !           109:        count = PAGE_SIZE - offset;
        !           110: 
        !           111:         IOPhysicalFromVirtual( (vm_task_t)client, (vm_address_t)round_page(addr), &maddr1 );
        !           112:         maddr1 = trunc_page(maddr1);
        !           113: 
        !           114:         IOMapPhysicalIntoIOTask( maddr0, PAGE_SIZE, &xaddr0 );
        !           115:         IOMapPhysicalIntoIOTask( maddr1, PAGE_SIZE, &xaddr1 );
        !           116: 
        !           117:         xaddr0 = trunc_page(xaddr0) + offset;
        !           118:         xaddr1 = trunc_page(xaddr1);
        !           119: 
        !           120:        if (count % 2) 
        !           121:         {
        !           122:             rwBuffer((unsigned char *)xaddr0, read, (count - 1), ideRegs.data);
        !           123:                    
        !           124:            if (read) 
        !           125:             {
        !           126:                sw = inw(ideRegs.data);
        !           127:                ((unsigned char *)xaddr0)[count-1] = (unsigned char)((sw & 0xff00) >> 8);
        !           128:                ((unsigned char *)xaddr1)[0]       = (unsigned char) (sw & 0x00ff);
        !           129:            } 
        !           130:             else 
        !           131:             {
        !           132:                sw  = ((unsigned char *)xaddr0)[count - 1] << 8;
        !           133:                sw |= ((unsigned char *)xaddr1)[0];
        !           134:                outw(ideRegs.data, sw);
        !           135:            }
        !           136:            xaddr1++;
        !           137:             rwBuffer((unsigned char *)xaddr1, read, (length - count - 1), ideRegs.data);
        !           138:        } 
        !           139:         else 
        !           140:         {
        !           141:             rwBuffer((unsigned char *)xaddr0, read, count, ideRegs.data );
        !           142:             rwBuffer((unsigned char *)xaddr1, read, (length - count), ideRegs.data );
        !           143:        }
        !           144: 
        !           145:         xaddr0 = trunc_page(xaddr0);
        !           146:         xaddr1 = trunc_page(xaddr1);
        !           147:         IOUnmapPhysicalFromIOTask( xaddr0, PAGE_SIZE );
        !           148:         IOUnmapPhysicalFromIOTask( xaddr1, PAGE_SIZE );
        !           149:     } 
        !           150:     else 
        !           151:     {
        !           152:         IOMapPhysicalIntoIOTask( maddr0, PAGE_SIZE, &xaddr0 );
        !           153:         xaddr0 = trunc_page(xaddr0) + offset;
        !           154: 
        !           155:         rwBuffer((unsigned char *) xaddr0, read, length, ideRegs.data );
        !           156: 
        !           157:         xaddr0 = trunc_page(xaddr0);
        !           158:         IOUnmapPhysicalFromIOTask( xaddr0, length );
        !           159:     }
        !           160: }

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