1 /* 2 * Copyright (c) 1997, Stefan Esser <se@freebsd.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/bus.h> 32 #include <sys/proc.h> 33 #include <sys/interrupt.h> 34 #include <sys/kernel.h> 35 36 #include <net/netisr.h> 37 38 static void swi_net(void *); 39 40 void *net_ih; 41 volatile unsigned int netisr; 42 void (*netisrs[32])(void); 43 44 void 45 legacy_setsoftnet(void) 46 { 47 swi_sched(net_ih, 0); 48 } 49 50 int 51 register_netisr(int num, netisr_t *handler) 52 { 53 54 if (num < 0 || num >= (sizeof(netisrs)/sizeof(*netisrs)) ) { 55 printf("register_netisr: bad isr number: %d\n", num); 56 return (EINVAL); 57 } 58 netisrs[num] = handler; 59 return (0); 60 } 61 62 int 63 unregister_netisr(int num) 64 { 65 66 if (num < 0 || num >= (sizeof(netisrs)/sizeof(*netisrs)) ) { 67 printf("unregister_netisr: bad isr number: %d\n", num); 68 return (EINVAL); 69 } 70 netisrs[num] = NULL; 71 return (0); 72 } 73 74 #ifdef DEVICE_POLLING 75 void netisr_pollmore(void); 76 #endif 77 78 static void 79 swi_net(void *dummy) 80 { 81 u_int bits; 82 int i; 83 84 #ifdef DEVICE_POLLING 85 for (;;) { 86 int pollmore; 87 #endif 88 bits = atomic_readandclear_int(&netisr); 89 #ifdef DEVICE_POLLING 90 if (bits == 0) 91 return; 92 pollmore = bits & (1 << NETISR_POLL); 93 #endif 94 while ((i = ffs(bits)) != 0) { 95 i--; 96 if (netisrs[i] != NULL) 97 netisrs[i](); 98 else 99 printf("swi_net: unregistered isr number: %d.\n", i); 100 bits &= ~(1 << i); 101 } 102 #ifdef DEVICE_POLLING 103 if (pollmore) 104 netisr_pollmore(); 105 } 106 #endif 107 } 108 109 static void 110 start_netisr(void *dummy) 111 { 112 113 if (swi_add(NULL, "net", swi_net, NULL, SWI_NET, 0, &net_ih)) 114 panic("start_netisr"); 115 } 116 SYSINIT(start_netisr, SI_SUB_SOFTINTR, SI_ORDER_FIRST, start_netisr, NULL) 117