1 /* $NetBSD: intr.c,v 1.36 2024/02/28 13:05:40 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 1.36 2024/02/28 13:05:40 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 volatile int ssir; 88 89 extern u_int intrcnt[]; /* from locore.s */ 90 91 void intr_computeipl(void); 92 93 #define MAX_INAME_LENGTH 53 94 #define STD_INAMES \ 95 "spur\0via1\0via2\0unused1\0scc\0unused2\0unused3\0nmi\0clock\0" 96 #define AUX_INAMES \ 97 "spur\0soft\0via2\0ethernet\0scc\0sound\0via1\0nmi\0clock\0 " 98 #define AV_INAMES \ 99 "spur\0via1\0via2\0ethernet\0scc\0dsp\0unused1\0nmi\0clock\0 " 100 101 void 102 intr_init(void) 103 { 104 extern char intrnames[MAX_INAME_LENGTH]; 105 extern char eintrnames[] __diagused; 106 const char *inames; 107 108 ipl2psl_table[IPL_NONE] = 0; 109 ipl2psl_table[IPL_SOFTCLOCK] = PSL_S|PSL_IPL1; 110 ipl2psl_table[IPL_SOFTNET] = PSL_S|PSL_IPL1; 111 ipl2psl_table[IPL_SOFTSERIAL] = PSL_S|PSL_IPL1; 112 ipl2psl_table[IPL_SOFTBIO] = PSL_S|PSL_IPL1; 113 ipl2psl_table[IPL_HIGH] = PSL_S|PSL_IPL7; 114 115 if (mac68k_machine.aux_interrupts) { 116 inames = AUX_INAMES; 117 118 /* Standard spl(9) interrupt priorities */ 119 ipl2psl_table[IPL_VM] = (PSL_S | PSL_IPL6); 120 ipl2psl_table[IPL_SCHED] = (PSL_S | PSL_IPL6); 121 } else { 122 inames = STD_INAMES; 123 124 /* Standard spl(9) interrupt priorities */ 125 ipl2psl_table[IPL_VM] = (PSL_S | PSL_IPL2); 126 ipl2psl_table[IPL_SCHED] = (PSL_S | PSL_IPL3); 127 128 if (current_mac_model->class == MACH_CLASSAV) { 129 inames = AV_INAMES; 130 ipl2psl_table[IPL_VM] = (PSL_S | PSL_IPL4); 131 ipl2psl_table[IPL_SCHED] = (PSL_S | PSL_IPL4); 132 } 133 } 134 135 KASSERT(MAX_INAME_LENGTH <= 136 ((uintptr_t)eintrnames - (uintptr_t)intrnames)); 137 memcpy(intrnames, inames, MAX_INAME_LENGTH); 138 139 intr_computeipl(); 140 141 /* Initialize the VIAs */ 142 via_init(); 143 144 /* Initialize the PSC (if present) */ 145 psc_init(); 146 } 147 148 149 /* 150 * Compute the interrupt levels for the spl*() 151 * calls. This doesn't have to be fast. 152 */ 153 void 154 intr_computeipl(void) 155 { 156 /* 157 * Enforce the following relationship, as defined in spl(9): 158 * `bio <= net <= tty <= vm <= statclock <= clock <= sched <= serial' 159 */ 160 if (ipl2psl_table[IPL_VM] > ipl2psl_table[IPL_SCHED]) 161 ipl2psl_table[IPL_SCHED] = ipl2psl_table[IPL_VM]; 162 163 if (ipl2psl_table[IPL_SCHED] > ipl2psl_table[IPL_HIGH]) 164 ipl2psl_table[IPL_HIGH] = ipl2psl_table[IPL_SCHED]; 165 } 166 167 /* 168 * Establish an autovectored interrupt handler. 169 * Called by driver attach functions. 170 * 171 * XXX Warning! DO NOT use Macintosh ROM traps from an interrupt handler 172 * established by this routine, either directly or indirectly, without 173 * properly saving and restoring all registers. If not, chaos _will_ 174 * ensue! (sar 19980806) 175 */ 176 void 177 intr_establish(int (*func)(void *), void *arg, int ipl) 178 { 179 if ((ipl < 0) || (ipl >= NISR)) 180 panic("intr_establish: bad ipl %d", ipl); 181 182 #ifdef DIAGNOSTIC 183 if (intr_func[ipl] != intr_noint) 184 printf("intr_establish: attempt to share ipl %d\n", ipl); 185 #endif 186 187 intr_func[ipl] = func; 188 intr_arg[ipl] = arg; 189 } 190 191 /* 192 * Disestablish an interrupt handler. 193 */ 194 void 195 intr_disestablish(int ipl) 196 { 197 if ((ipl < 0) || (ipl >= NISR)) 198 panic("intr_disestablish: bad ipl %d", ipl); 199 200 intr_func[ipl] = intr_noint; 201 intr_arg[ipl] = NULL; 202 } 203 204 /* 205 * This is the dispatcher called by the low-level 206 * assembly language interrupt routine. 207 * 208 * XXX Note: see the warning in intr_establish() 209 */ 210 void 211 intr_dispatch(struct clockframe frame) 212 { 213 const int ipl = VECO_TO_VECI(frame.cf_vo) - VECI_INTRAV0; 214 215 intr_depth++; 216 217 intrcnt[ipl]++; 218 curcpu()->ci_data.cpu_nintr++; 219 220 (void)(*intr_func[ipl])(intr_arg[ipl] ? intr_arg[ipl] : &frame); 221 intr_depth--; 222 } 223 224 /* 225 * Default interrupt handler: do nothing. 226 */ 227 static int 228 intr_noint(void *arg) 229 { 230 #ifdef DEBUG 231 intr_depth++; 232 if (intr_debug) { 233 const struct clockframe *frame = arg; 234 const int ipl = VECO_TO_VECI(frame->cf_vo) - VECI_INTRAV0; 235 printf("intr_noint: ipl %d\n", ipl); 236 } 237 intr_depth--; 238 #endif 239 return 0; 240 } 241 242 bool 243 cpu_intr_p(void) 244 { 245 246 return intr_depth != 0; 247 } 248
Indexes created Tue Sep 30 20:09:53 GMT 2025