File: /usr/src/linux/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 ** relevent 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 ***********/
197