1 /* $NetBSD: intr.c,v 1.37 2026/03/18 04:08:38 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 1996, 1997 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Adam Glass, Gordon W. Ross, and Jason R. Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Link and dispatch interrupts. 34 */ 35 36 #include <sys/cdefs.h> 37 __KERNEL_RCSID(0, "$NetBSD: intr.c,v 1.37 2026/03/18 04:08:38 thorpej Exp $"); 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/vmmeter.h> 42 #include <sys/cpu.h> 43 #include <sys/intr.h> 44 45 #include <m68k/vectors.h> 46 47 #include <machine/psc.h> 48 #include <machine/viareg.h> 49 50 #define NISR 8 51 #define ISRLOC 0x18 52 53 static int intr_noint(void *); 54 55 static int ((*intr_func[NISR])(void *)) = { 56 intr_noint, 57 intr_noint, 58 intr_noint, 59 intr_noint, 60 intr_noint, 61 intr_noint, 62 intr_noint, 63 intr_noint 64 }; 65 static void *intr_arg[NISR] = { 66 NULL, 67 NULL, 68 NULL, 69 NULL, 70 NULL, 71 NULL, 72 NULL, 73 NULL 74 }; 75 76 #ifdef DEBUG 77 int intr_debug = 0; 78 #endif 79 80 /* 81 * Some of the below are not used yet, but might be used someday on the 82 * IIfx/Q700/900/950/etc. where the interrupt controller may be reprogrammed 83 * to interrupt on different levels as listed in locore.s 84 */ 85 uint16_t ipl2psl_table[NIPL]; 86 volatile unsigned int intr_depth; 87 88 extern u_int intrcnt[]; /* from locore.s */ 89 90 void intr_computeipl(void); 91 92 #define MAX_INAME_LENGTH 53 93 #define STD_INAMES \ 94 "spur\0via1\0via2\0unused1\0scc\0unused2\0unused3\0nmi\0clock\0" 95 #define AUX_INAMES \ 96 "spur\0soft\0via2\0ethernet\0scc\0sound\0via1\0nmi\0clock\0 " 97 #define AV_INAMES \ 98 "spur\0via1\0via2\0ethernet\0scc\0dsp\0unused1\0nmi\0clock\0 " 99 100 void 101 intr_init(void) 102 { 103 extern char intrnames[MAX_INAME_LENGTH]; 104 extern char eintrnames[] __diagused; 105 const char *inames; 106 107 ipl2psl_table[IPL_NONE] = 0; 108 ipl2psl_table[IPL_SOFTCLOCK] = PSL_S|PSL_IPL1; 109 ipl2psl_table[IPL_SOFTNET] = PSL_S|PSL_IPL1; 110 ipl2psl_table[IPL_SOFTSERIAL] = PSL_S|PSL_IPL1; 111 ipl2psl_table[IPL_SOFTBIO] = PSL_S|PSL_IPL1; 112 ipl2psl_table[IPL_HIGH] = PSL_S|PSL_IPL7; 113 114 if (mac68k_machine.aux_interrupts) { 115 inames = AUX_INAMES; 116 117 /* Standard spl(9) interrupt priorities */ 118 ipl2psl_table[IPL_VM] = (PSL_S | PSL_IPL6); 119 ipl2psl_table[IPL_SCHED] = (PSL_S | PSL_IPL6); 120 } else { 121 inames = STD_INAMES; 122 123 /* Standard spl(9) interrupt priorities */ 124 ipl2psl_table[IPL_VM] = (PSL_S | PSL_IPL2); 125 ipl2psl_table[IPL_SCHED] = (PSL_S | PSL_IPL3); 126 127 if (current_mac_model->class == MACH_CLASSAV) { 128 inames = AV_INAMES; 129 ipl2psl_table[IPL_VM] = (PSL_S | PSL_IPL4); 130 ipl2psl_table[IPL_SCHED] = (PSL_S | PSL_IPL4); 131 } 132 } 133 134 KASSERT(MAX_INAME_LENGTH <= 135 ((uintptr_t)eintrnames - (uintptr_t)intrnames)); 136 memcpy(intrnames, inames, MAX_INAME_LENGTH); 137 138 intr_computeipl(); 139 140 /* Initialize the VIAs */ 141 via_init(); 142 143 /* Initialize the PSC (if present) */ 144 psc_init(); 145 } 146 147 148 /* 149 * Compute the interrupt levels for the spl*() 150 * calls. This doesn't have to be fast. 151 */ 152 void 153 intr_computeipl(void) 154 { 155 /* 156 * Enforce the following relationship, as defined in spl(9): 157 * `bio <= net <= tty <= vm <= statclock <= clock <= sched <= serial' 158 */ 159 if (ipl2psl_table[IPL_VM] > ipl2psl_table[IPL_SCHED]) 160 ipl2psl_table[IPL_SCHED] = ipl2psl_table[IPL_VM]; 161 162 if (ipl2psl_table[IPL_SCHED] > ipl2psl_table[IPL_HIGH]) 163 ipl2psl_table[IPL_HIGH] = ipl2psl_table[IPL_SCHED]; 164 } 165 166 /* 167 * Establish an autovectored interrupt handler. 168 * Called by driver attach functions. 169 * 170 * XXX Warning! DO NOT use Macintosh ROM traps from an interrupt handler 171 * established by this routine, either directly or indirectly, without 172 * properly saving and restoring all registers. If not, chaos _will_ 173 * ensue! (sar 19980806) 174 */ 175 void 176 intr_establish(int (*func)(void *), void *arg, int ipl) 177 { 178 if ((ipl < 0) || (ipl >= NISR)) 179 panic("intr_establish: bad ipl %d", ipl); 180 181 #ifdef DIAGNOSTIC 182 if (intr_func[ipl] != intr_noint) 183 printf("intr_establish: attempt to share ipl %d\n", ipl); 184 #endif 185 186 intr_func[ipl] = func; 187 intr_arg[ipl] = arg; 188 } 189 190 /* 191 * Disestablish an interrupt handler. 192 */ 193 void 194 intr_disestablish(int ipl) 195 { 196 if ((ipl < 0) || (ipl >= NISR)) 197 panic("intr_disestablish: bad ipl %d", ipl); 198 199 intr_func[ipl] = intr_noint; 200 intr_arg[ipl] = NULL; 201 } 202 203 /* 204 * This is the dispatcher called by the low-level 205 * assembly language interrupt routine. 206 * 207 * XXX Note: see the warning in intr_establish() 208 */ 209 void 210 intr_dispatch(struct clockframe frame) 211 { 212 const int ipl = VECO_TO_VECI(frame.cf_vo) - VECI_INTRAV0; 213 214 intr_depth++; 215 216 intrcnt[ipl]++; 217 curcpu()->ci_data.cpu_nintr++; 218 219 (void)(*intr_func[ipl])(intr_arg[ipl] ? intr_arg[ipl] : &frame); 220 intr_depth--; 221 } 222 223 /* 224 * Default interrupt handler: do nothing. 225 */ 226 static int 227 intr_noint(void *arg) 228 { 229 #ifdef DEBUG 230 intr_depth++; 231 if (intr_debug) { 232 const struct clockframe *frame = arg; 233 const int ipl = VECO_TO_VECI(frame->cf_vo) - VECI_INTRAV0; 234 printf("intr_noint: ipl %d\n", ipl); 235 } 236 intr_depth--; 237 #endif 238 return 0; 239 } 240 241 bool 242 cpu_intr_p(void) 243 { 244 245 return intr_depth != 0; 246 } 247
Indexes created Sun Oct 25 00:26:45 UTC 2026