Annotation of sys/arch/i386/include/pio.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: pio.h,v 1.9 2001/06/27 04:34:23 mickey Exp $ */
! 2: /* $NetBSD: pio.h,v 1.13 1996/03/08 20:15:23 cgd Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1993, 1995 Charles M. Hannum. All rights reserved.
! 6: *
! 7: * Redistribution and use in source and binary forms, with or without
! 8: * modification, are permitted provided that the following conditions
! 9: * are met:
! 10: * 1. Redistributions of source code must retain the above copyright
! 11: * notice, this list of conditions and the following disclaimer.
! 12: * 2. Redistributions in binary form must reproduce the above copyright
! 13: * notice, this list of conditions and the following disclaimer in the
! 14: * documentation and/or other materials provided with the distribution.
! 15: * 3. All advertising materials mentioning features or use of this software
! 16: * must display the following acknowledgement:
! 17: * This product includes software developed by Charles M. Hannum.
! 18: * 4. The name of the author may not be used to endorse or promote products
! 19: * derived from this software without specific prior written permission
! 20: *
! 21: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
! 22: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
! 23: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
! 24: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
! 25: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
! 26: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
! 27: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
! 28: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
! 29: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
! 30: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
! 31: */
! 32:
! 33: #ifndef _I386_PIO_H_
! 34: #define _I386_PIO_H_
! 35:
! 36: /*
! 37: * Functions to provide access to i386 programmed I/O instructions.
! 38: *
! 39: * The in[bwl]() and out[bwl]() functions are split into two varieties: one to
! 40: * use a small, constant, 8-bit port number, and another to use a large or
! 41: * variable port number. The former can be compiled as a smaller instruction.
! 42: */
! 43:
! 44:
! 45: #ifdef __OPTIMIZE__
! 46:
! 47: #define __use_immediate_port(port) \
! 48: (__builtin_constant_p((port)) && (port) < 0x100)
! 49:
! 50: #else
! 51:
! 52: #define __use_immediate_port(port) 0
! 53:
! 54: #endif
! 55:
! 56:
! 57: #define inb(port) \
! 58: (__use_immediate_port(port) ? __inbc(port) : __inb(port))
! 59:
! 60: static __inline u_int8_t
! 61: __inbc(int port)
! 62: {
! 63: u_int8_t data;
! 64: __asm __volatile("inb %w1,%0" : "=a" (data) : "id" (port));
! 65: return data;
! 66: }
! 67:
! 68: static __inline u_int8_t
! 69: __inb(int port)
! 70: {
! 71: u_int8_t data;
! 72: __asm __volatile("inb %w1,%0" : "=a" (data) : "d" (port));
! 73: return data;
! 74: }
! 75:
! 76: static __inline void
! 77: insb(int port, void *addr, int cnt)
! 78: {
! 79: __asm __volatile("cld\n\trepne\n\tinsb"
! 80: : "+D" (addr), "+c" (cnt) : "d" (port) : "memory", "cc");
! 81: }
! 82:
! 83: #define inw(port) \
! 84: (__use_immediate_port(port) ? __inwc(port) : __inw(port))
! 85:
! 86: static __inline u_int16_t
! 87: __inwc(int port)
! 88: {
! 89: u_int16_t data;
! 90: __asm __volatile("inw %w1,%0" : "=a" (data) : "id" (port));
! 91: return data;
! 92: }
! 93:
! 94: static __inline u_int16_t
! 95: __inw(int port)
! 96: {
! 97: u_int16_t data;
! 98: __asm __volatile("inw %w1,%0" : "=a" (data) : "d" (port));
! 99: return data;
! 100: }
! 101:
! 102: static __inline void
! 103: insw(int port, void *addr, int cnt)
! 104: {
! 105: __asm __volatile("cld\n\trepne\n\tinsw"
! 106: : "+D" (addr), "+c" (cnt) : "d" (port) : "memory", "cc");
! 107: }
! 108:
! 109: #define inl(port) \
! 110: (__use_immediate_port(port) ? __inlc(port) : __inl(port))
! 111:
! 112: static __inline u_int32_t
! 113: __inlc(int port)
! 114: {
! 115: u_int32_t data;
! 116: __asm __volatile("inl %w1,%0" : "=a" (data) : "id" (port));
! 117: return data;
! 118: }
! 119:
! 120: static __inline u_int32_t
! 121: __inl(int port)
! 122: {
! 123: u_int32_t data;
! 124: __asm __volatile("inl %w1,%0" : "=a" (data) : "d" (port));
! 125: return data;
! 126: }
! 127:
! 128: static __inline void
! 129: insl(int port, void *addr, int cnt)
! 130: {
! 131: __asm __volatile("cld\n\trepne\n\tinsl"
! 132: : "+D" (addr), "+c" (cnt) : "d" (port) : "memory", "cc");
! 133: }
! 134:
! 135: #define outb(port, data) \
! 136: (__use_immediate_port(port) ? __outbc(port, data) : __outb(port, data))
! 137:
! 138: static __inline void
! 139: __outbc(int port, u_int8_t data)
! 140: {
! 141: __asm __volatile("outb %0,%w1" : : "a" (data), "id" (port));
! 142: }
! 143:
! 144: static __inline void
! 145: __outb(int port, u_int8_t data)
! 146: {
! 147: __asm __volatile("outb %0,%w1" : : "a" (data), "d" (port));
! 148: }
! 149:
! 150: static __inline void
! 151: outsb(int port, const void *addr, int cnt)
! 152: {
! 153: __asm __volatile("cld\n\trepne\n\toutsb"
! 154: : "+S" (addr), "+c" (cnt) : "d" (port) : "cc");
! 155: }
! 156:
! 157: #define outw(port, data) \
! 158: (__use_immediate_port(port) ? __outwc(port, data) : __outw(port, data))
! 159:
! 160: static __inline void
! 161: __outwc(int port, u_int16_t data)
! 162: {
! 163: __asm __volatile("outw %0,%w1" : : "a" (data), "id" (port));
! 164: }
! 165:
! 166: static __inline void
! 167: __outw(int port, u_int16_t data)
! 168: {
! 169: __asm __volatile("outw %0,%w1" : : "a" (data), "d" (port));
! 170: }
! 171:
! 172: static __inline void
! 173: outsw(int port, const void *addr, int cnt)
! 174: {
! 175: __asm __volatile("cld\n\trepne\n\toutsw"
! 176: : "+S" (addr), "+c" (cnt) : "d" (port) : "cc");
! 177: }
! 178:
! 179: #define outl(port, data) \
! 180: (__use_immediate_port(port) ? __outlc(port, data) : __outl(port, data))
! 181:
! 182: static __inline void
! 183: __outlc(int port, u_int32_t data)
! 184: {
! 185: __asm __volatile("outl %0,%w1" : : "a" (data), "id" (port));
! 186: }
! 187:
! 188: static __inline void
! 189: __outl(int port, u_int32_t data)
! 190: {
! 191: __asm __volatile("outl %0,%w1" : : "a" (data), "d" (port));
! 192: }
! 193:
! 194: static __inline void
! 195: outsl(int port, const void *addr, int cnt)
! 196: {
! 197: __asm __volatile("cld\n\trepne\n\toutsl"
! 198: : "+S" (addr), "+c" (cnt) : "d" (port) : "cc");
! 199: }
! 200:
! 201: #endif /* _I386_PIO_H_ */
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