sa11x0_irq.S revision 1.20
1 /* $NetBSD: sa11x0_irq.S,v 1.20 2020/11/21 19:59:10 skrll Exp $ */ 2 3 /* 4 * Copyright (c) 1998 Mark Brinicombe. 5 * Copyright (c) 1998 Causality Limited 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to the NetBSD Foundation 9 * by IWAMOTO Toshihiro. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by Mark Brinicombe 22 * for the NetBSD Project. 23 * 4. The name of the company nor the name of the author may be used to 24 * endorse or promote products derived from this software without specific 25 * prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 28 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 29 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 30 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 31 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 32 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 33 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 */ 39 40 #include "opt_irqstats.h" 41 42 #include "assym.h" 43 44 #include <arm/asm.h> 45 #include <arm/locore.h> 46 #include <arm/sa11x0/sa11x0_reg.h> 47 48 49 .text 50 .align 0 51 52 Lspl_masks: 53 .word _C_LABEL(spl_masks) 54 55 Lcpu_info_store: 56 .word _C_LABEL(cpu_info_store) 57 58 .globl _C_LABEL(saipic_base) 59 _C_LABEL(saipic_base): 60 .word 0x00000000 61 62 #ifdef INTR_DEBUG 63 Ldbg_str: 64 .asciz "irq_entry %x %x\n" 65 .align 5 66 #endif 67 68 LOCK_CAS_CHECK_LOCALS 69 70 AST_ALIGNMENT_FAULT_LOCALS 71 72 /* 73 * Register usage 74 * 75 * r4 - Pointer to curcpu 76 * r5 - pointer to curlwp 77 * r6 - Address of current handler 78 * r7 - pspr mode 79 * r8 - Current IRQ requests. 80 * r9 - Used to count through possible IRQ bits. 81 * r10 - Base address of SAIP 82 * r11 - Pointer to handler pointer list 83 */ 84 85 ASENTRY_NP(irq_entry) 86 sub lr, lr, #0x00000004 /* Adjust the lr */ 87 88 PUSHFRAMEINSVC /* Push an interrupt frame */ 89 ENABLE_ALIGNMENT_FAULTS /* puts cur{cpu,lwp} in r4/r5 */ 90 91 /* Load r8 with the SAIPIC interrupt requests */ 92 93 ldr r10, _C_LABEL(saipic_base) 94 ldr r8, [r10, #(SAIPIC_IP)] /* Load IRQ pending register */ 95 96 #ifdef INTR_DEBUG 97 ldr r2, [r10, #(SAIPIC_MR)] 98 adr r0, Ldbg_str 99 mov r1, r8 100 bl _C_LABEL(printf) 101 #endif 102 /* 103 * Note that we have entered the IRQ handler. 104 * We are in SVC mode so we cannot use the processor mode 105 * to determine if we are in an IRQ. Instead we will count the 106 * each time the interrupt handler is nested. 107 */ 108 109 ldr r1, [r4, #CI_INTR_DEPTH] 110 add r1, r1, #1 111 str r1, [r4, #CI_INTR_DEPTH] 112 113 /* 114 * Need to block all interrupts at the IPL or lower for 115 * all asserted interrupts. 116 * This basically emulates hardware interrupt priority levels. 117 * Means we need to go through the interrupt mask and for 118 * every asserted interrupt we need to mask out all other 119 * interrupts at the same or lower IPL. 120 * If only we could wait until the main loop but we need to sort 121 * this out first so interrupts can be re-enabled. 122 * 123 * This would benefit from a special ffs type routine 124 */ 125 126 mov r9, #(NIPL - 1) 127 ldr r11, Lspl_masks 128 129 Lfind_highest_ipl: 130 ldr r2, [r11, r9, lsl #2] 131 tst r8, r2 132 subeq r9, r9, #1 133 beq Lfind_highest_ipl 134 135 /* r9 = SPL level of highest priority interrupt */ 136 add r9, r9, #1 137 ldr r2, [r11, r9, lsl #2] 138 139 ldr r1, [r4, #CI_CPL] 140 str r9, [r4, #CI_CPL] 141 stmfd sp!, {r1} 142 143 /* Update the SAIP irq masks */ 144 bl _C_LABEL(irq_setmasks) 145 146 #ifdef INTR_DEBUG 147 stmfd sp!, {r0,r1,r2} 148 adr r0, Ldbg_str 149 mov r1, #1 150 mov r2, r9 151 bl _C_LABEL(printf) 152 ldmia sp!, {r0,r1,r2} 153 #endif 154 mrs r0, cpsr /* Enable IRQs */ 155 bic r0, r0, #I32_bit 156 msr cpsr_all, r0 157 158 ldr r11, Lirqhandlers 159 mov r9, #0x00000001 160 161 irqloop: 162 /* This would benefit from a special ffs type routine */ 163 tst r8, r9 /* Is a bit set ? */ 164 beq nextirq /* No ? try next bit */ 165 166 ldr r6, [r11] /* Get address of first handler structure */ 167 168 teq r6, #0x00000000 /* Do we have a handler */ 169 moveq r0, r8 /* IRQ requests as arg 0 */ 170 beq _C_LABEL(stray_irqhandler) /* call special handler */ 171 172 ldr r0, [r4, #(CI_CC_NINTR)] 173 ldr r1, [r4, #(CI_CC_NINTR+4)] 174 #ifdef _ARMEL 175 adds r0, r0, #0x00000001 176 adc r1, r1, #0x00000001 177 #else 178 adds r1, r1, #0x00000001 179 adc r0, r0, #0x00000000 180 #endif 181 str r0, [r4, #(CI_CC_NINTR)] 182 str r1, [r4, #(CI_CC_NINTR+4)] 183 184 /* 185 * XXX: Should stats be accumulated for every interrupt routine 186 * called or for every physical interrupt that is serviced. 187 */ 188 189 #ifdef IRQSTATS 190 ldr r0, Lintrcnt 191 ldr r1, [r6, #(IH_COUNT)] 192 193 add r0, r0, r1, lsl #2 194 ldr r1, [r0] 195 add r1, r1, #0x00000001 196 str r1, [r0] 197 #endif /* IRQSTATS */ 198 199 irqchainloop: 200 #ifdef INTR_DEBUG 201 stmfd sp!, {r0,r1,r2} 202 adr r0, Ldbg_str 203 mov r1, #2 204 bl _C_LABEL(printf) 205 ldmia sp!, {r0,r1,r2} 206 #endif 207 ldr r0, [r6, #(IH_ARG)] /* Get argument pointer */ 208 teq r0, #0x00000000 /* If arg is zero pass stack frame */ 209 addeq r0, sp, #4 /* ... stack frame [XXX needs care] */ 210 mov lr, pc /* return address */ 211 ldr pc, [r6, #(IH_FUNC)] /* Call handler */ 212 213 teq r0, #0x00000001 /* Was the irq serviced ? */ 214 beq irqdone 215 216 ldr r6, [r6, #(IH_NEXT)] 217 teq r6, #0x00000000 218 bne irqchainloop 219 220 irqdone: 221 nextirq: 222 add r11, r11, #0x00000004 /* update pointer to handlers */ 223 mov r9, r9, lsl #1 /* move on to next bit */ 224 teq r9, #(1 << 31) /* done the last bit ? */ 225 bne irqloop /* no - loop back. */ 226 227 ldmfd sp!, {r2} 228 str r2, [r4, #CI_CPL] 229 230 /* Restore previous disabled mask */ 231 bl _C_LABEL(irq_setmasks) 232 233 /* Kill IRQ's in preparation for exit */ 234 mrs r0, cpsr 235 orr r0, r0, #(I32_bit) 236 msr cpsr_all, r0 237 238 #ifdef INTR_DEBUG 239 adr r0, Ldbg_str 240 mov r1, #3 241 ldr r2, [r10, #(SAIPIC_MR)] 242 bl _C_LABEL(printf) 243 #endif 244 245 /* Decrement the nest count */ 246 ldr r1, [r4, #CI_INTR_DEPTH] 247 sub r1, r1, #1 248 str r1, [r4, #CI_INTR_DEPTH] 249 250 LOCK_CAS_CHECK 251 252 DO_AST_AND_RESTORE_ALIGNMENT_FAULTS 253 PULLFRAMEFROMSVCANDEXIT 254 255 /* NOT REACHED */ 256 b . - 8 257 258 ENTRY(irq_setmasks) 259 stmfd sp!, {r0, r1, r4, lr} /* Preserve registers */ 260 261 /* Disable interrupts */ 262 mrs r1, cpsr 263 orr r3, r1, #(I32_bit) 264 msr cpsr_all, r3 265 266 /* Calculate interrupt mask */ 267 ldr r0, Lspl_masks 268 ldr r4, Lcpu_info_store 269 ldr r2, [r4, #CI_CPL] 270 ldr r2, [r0, r2, lsl #2] 271 272 ldr r0, _C_LABEL(saipic_base) 273 str r2, [r0, #(SAIPIC_MR)] /* Set mask register */ 274 275 /* Restore old cpsr and exit */ 276 msr cpsr_all, r1 277 ldmia sp!, {r0, r1, r4, pc} /* Restore registers */ 278 279 #ifdef IRQSTATS 280 Lintrcnt: 281 .word _C_LABEL(intrcnt) 282 #endif 283 284 Lirqhandlers: 285 .word _C_LABEL(irqhandlers) /* Pointer to array of irqhandlers */ 286 287 288 #ifdef IRQSTATS 289 .global _C_LABEL(intrnames), _C_LABEL(eintrnames) 290 .global _C_LABEL(eintrcnt) 291 _C_LABEL(intrnames): 292 _C_LABEL(eintrnames): 293 _C_LABEL(eintrcnt): 294 295 .globl _C_LABEL(intrcnt), _C_LABEL(sintrcnt) 296 297 _C_LABEL(intrcnt): 298 .space ICU_LEN*4 /* XXX Should be linked to number of interrupts */ 299 300 _C_LABEL(sintrcnt): 301 .space 32*4 302 #endif 303
Indexes created Sat Oct 11 19:10:01 GMT 2025