drivers/char/rio/list.h

   1 /****************************************************************************
   2  *******                                                              *******
   3  *******                      L I S T                                 *******
   4  *******                                                              *******
   5  ****************************************************************************
   6
   7  Author  : Jeremy Rolls.
   8  Date    : 04-Nov-1990
   9
  10  *
  11  *  (C) 1990 - 2000 Specialix International Ltd., Byfleet, Surrey, UK.
  12  *
  13  *      This program is free software; you can redistribute it and/or modify
  14  *      it under the terms of the GNU General Public License as published by
  15  *      the Free Software Foundation; either version 2 of the License, or
  16  *      (at your option) any later version.
  17  *
  18  *      This program is distributed in the hope that it will be useful,
  19  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  *      GNU General Public License for more details.
  22  *
  23  *      You should have received a copy of the GNU General Public License
  24  *      along with this program; if not, write to the Free Software
  25  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  26
  27  Version : 0.01
  28
  29
  30                             Mods
  31  ----------------------------------------------------------------------------
  32   Date     By                Description
  33  ----------------------------------------------------------------------------
  34  ***************************************************************************/
  35
  36 #ifndef _list_h
  37 #define _list_h 1
  38
  39 #ifdef SCCS_LABELS
  40 #ifndef lint
  41 static char *_rio_list_h_sccs = "@(#)list.h     1.9" ;
  42 #endif
  43 #endif
  44
  45 #define PKT_IN_USE    0x1
  46
  47 #ifdef INKERNEL
  48
  49 #define ZERO_PTR (ushort) 0x8000
  50 #define CaD     PortP->Caddr
  51
  52 /*
  53 ** We can add another packet to a transmit queue if the packet pointer pointed
  54 ** to by the TxAdd pointer has PKT_IN_USE clear in its address.
  55 */
  56
  57 #ifndef linux
  58 #if defined( MIPS ) && !defined( MIPSEISA )
  59 /* May the shoes of the Devil dance on your grave for creating this */
  60 #define   can_add_transmit(PacketP,PortP) \
  61           (!((uint)(PacketP = (struct PKT *)RIO_PTR(CaD,RINDW(PortP->TxAdd))) \
  62           & (PKT_IN_USE<<2)))
  63
  64 #elif  defined(MIPSEISA) || defined(nx6000) || \
  65        defined(drs6000)  || defined(UWsparc)
  66
  67 #define   can_add_transmit(PacketP,PortP) \
  68           (!((uint)(PacketP = (struct PKT *)RIO_PTR(CaD,RINDW(PortP->TxAdd))) \
  69           & PKT_IN_USE))
  70
  71 #else
  72 #define   can_add_transmit(PacketP,PortP) \
  73           (!((uint)(PacketP = (struct PKT *)RIO_PTR(CaD,*PortP->TxAdd)) \
  74           & PKT_IN_USE))
  75 #endif
  76
  77 /*
  78 ** To add a packet to the queue, you set the PKT_IN_USE bit in the address,
  79 ** and then move the TxAdd pointer along one position to point to the next
  80 ** packet pointer. You must wrap the pointer from the end back to the start.
  81 */
  82 #if defined(MIPS) || defined(nx6000) || defined(drs6000) || defined(UWsparc)
  83 #   define add_transmit(PortP)  \
  84         WINDW(PortP->TxAdd,RINDW(PortP->TxAdd) | PKT_IN_USE);\
  85         if (PortP->TxAdd == PortP->TxEnd)\
  86             PortP->TxAdd = PortP->TxStart;\
  87         else\
  88             PortP->TxAdd++;\
  89         WWORD(PortP->PhbP->tx_add , RIO_OFF(CaD,PortP->TxAdd));
  90 #elif defined(AIX)
  91 #   define add_transmit(PortP)  \
  92         {\
  93             register ushort *TxAddP = (ushort *)RIO_PTR(Cad,PortP->TxAddO);\
  94             WINDW( TxAddP, RINDW( TxAddP ) | PKT_IN_USE );\
  95             if (PortP->TxAddO == PortP->TxEndO )\
  96                 PortP->TxAddO = PortP->TxStartO;\
  97             else\
  98                 PortP->TxAddO += sizeof(ushort);\
  99             WWORD(((PHB *)RIO_PTR(Cad,PortP->PhbO))->tx_add , PortP->TxAddO );\
 100         }
 101 #else
 102 #   define add_transmit(PortP)  \
 103         *PortP->TxAdd |= PKT_IN_USE;\
 104         if (PortP->TxAdd == PortP->TxEnd)\
 105             PortP->TxAdd = PortP->TxStart;\
 106         else\
 107             PortP->TxAdd++;\
 108         PortP->PhbP->tx_add = RIO_OFF(CaD,PortP->TxAdd);
 109 #endif
 110
 111 /*
 112 ** can_remove_receive( PacketP, PortP ) returns non-zero if PKT_IN_USE is set
 113 ** for the next packet on the queue. It will also set PacketP to point to the
 114 ** relevant packet, [having cleared the PKT_IN_USE bit]. If PKT_IN_USE is clear,
 115 ** then can_remove_receive() returns 0.
 116 */
 117 #if defined(MIPS) || defined(nx6000) || defined(drs6000) || defined(UWsparc)
 118 #   define can_remove_receive(PacketP,PortP) \
 119         ((RINDW(PortP->RxRemove) & PKT_IN_USE) ? \
 120         (PacketP=(struct PKT *)RIO_PTR(CaD,(RINDW(PortP->RxRemove) & ~PKT_IN_USE))):0)
 121 #elif defined(AIX)
 122 #   define can_remove_receive(PacketP,PortP) \
 123         ((RINDW((ushort *)RIO_PTR(Cad,PortP->RxRemoveO)) & PKT_IN_USE) ? \
 124         (PacketP=(struct PKT *)RIO_PTR(Cad,RINDW((ushort *)RIO_PTR(Cad,PortP->RxRemoveO)) & ~PKT_IN_USE)):0)
 125 #else
 126 #   define can_remove_receive(PacketP,PortP) \
 127         ((*PortP->RxRemove & PKT_IN_USE) ? \
 128         (PacketP=(struct PKT *)RIO_PTR(CaD,(*PortP->RxRemove & ~PKT_IN_USE))):0)
 129 #endif
 130
 131
 132 /*
 133 ** Will God see it within his heart to forgive us for this thing that
 134 ** we have created? To remove a packet from the receive queue you clear
 135 ** its PKT_IN_USE bit, and then bump the pointers. Once the pointers
 136 ** get to the end, they must be wrapped back to the start.
 137 */
 138 #if defined(MIPS) || defined(nx6000) || defined(drs6000) || defined(UWsparc)
 139 #   define remove_receive(PortP) \
 140         WINDW(PortP->RxRemove, (RINDW(PortP->RxRemove) & ~PKT_IN_USE));\
 141         if (PortP->RxRemove == PortP->RxEnd)\
 142             PortP->RxRemove = PortP->RxStart;\
 143         else\
 144             PortP->RxRemove++;\
 145         WWORD(PortP->PhbP->rx_remove , RIO_OFF(CaD,PortP->RxRemove));
 146 #elif defined(AIX)
 147 #   define remove_receive(PortP) \
 148     {\
 149         register ushort *RxRemoveP = (ushort *)RIO_PTR(Cad,PortP->RxRemoveO);\
 150         WINDW( RxRemoveP, RINDW( RxRemoveP ) & ~PKT_IN_USE );\
 151         if (PortP->RxRemoveO == PortP->RxEndO)\
 152             PortP->RxRemoveO = PortP->RxStartO;\
 153         else\
 154             PortP->RxRemoveO += sizeof(ushort);\
 155         WWORD(((PHB *)RIO_PTR(Cad,PortP->PhbO))->rx_remove, PortP->RxRemoveO );\
 156     }
 157 #else
 158 #   define remove_receive(PortP) \
 159         *PortP->RxRemove &= ~PKT_IN_USE;\
 160         if (PortP->RxRemove == PortP->RxEnd)\
 161             PortP->RxRemove = PortP->RxStart;\
 162         else\
 163             PortP->RxRemove++;\
 164         PortP->PhbP->rx_remove = RIO_OFF(CaD,PortP->RxRemove);
 165 #endif
 166 #endif
 167
 168
 169 #else /* !IN_KERNEL */
 170
 171 #define ZERO_PTR NULL
 172
 173
 174 #ifdef HOST
 175 /* #define can_remove_transmit(pkt,phb) ((((char*)pkt = (*(char**)(phb->tx_remove))-1) || 1)) && (*phb->u3.s2.tx_remove_ptr & PKT_IN_USE))   */
 176 #define remove_transmit(phb) *phb->u3.s2.tx_remove_ptr &= ~(ushort)PKT_IN_USE;\
 177                              if (phb->tx_remove == phb->tx_end)\
 178                                 phb->tx_remove = phb->tx_start;\
 179                              else\
 180                                 phb->tx_remove++;
 181 #define can_add_receive(phb) !(*phb->u4.s2.rx_add_ptr & PKT_IN_USE)
 182 #define add_receive(pkt,phb) *phb->rx_add = pkt;\
 183                              *phb->u4.s2.rx_add_ptr |= PKT_IN_USE;\
 184                              if (phb->rx_add == phb->rx_end)\
 185                                 phb->rx_add = phb->rx_start;\
 186                              else\
 187                                 phb->rx_add++;
 188 #endif
 189 #endif
 190
 191 #ifdef RTA
 192 #define splx(oldspl)    if ((oldspl) == 0) spl0()
 193 #endif
 194
 195 #endif /* ifndef _list.h */
 196 /*********** end of file ***********/