1 /* 2 * HPPA interrupt helper routines 3 * 4 * Copyright (c) 2017 Richard Henderson 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * This library is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with this library; if not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #include "qemu/osdep.h" 21 #include "qemu/main-loop.h" 22 #include "qemu/log.h" 23 #include "cpu.h" 24 #include "exec/helper-proto.h" 25 #include "hw/core/cpu.h" 26 #include "hw/hppa/hppa_hardware.h" 27 28 static void eval_interrupt(HPPACPU *cpu) 29 { 30 CPUState *cs = CPU(cpu); 31 if (cpu->env.cr[CR_EIRR] & cpu->env.cr[CR_EIEM]) { 32 cpu_interrupt(cs, CPU_INTERRUPT_HARD); 33 } else { 34 cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD); 35 } 36 } 37 38 /* Each CPU has a word mapped into the GSC bus. Anything on the GSC bus 39 * can write to this word to raise an external interrupt on the target CPU. 40 * This includes the system controller (DINO) for regular devices, or 41 * another CPU for SMP interprocessor interrupts. 42 */ 43 static uint64_t io_eir_read(void *opaque, hwaddr addr, unsigned size) 44 { 45 HPPACPU *cpu = opaque; 46 47 /* ??? What does a read of this register over the GSC bus do? */ 48 return cpu->env.cr[CR_EIRR]; 49 } 50 51 static void io_eir_write(void *opaque, hwaddr addr, 52 uint64_t data, unsigned size) 53 { 54 HPPACPU *cpu = opaque; 55 CPUHPPAState *env = &cpu->env; 56 int widthm1 = 31; 57 int le_bit; 58 59 /* The default PSW.W controls the width of EIRR. */ 60 if (hppa_is_pa20(env) && env->cr[CR_PSW_DEFAULT] & PDC_PSW_WIDE_BIT) { 61 widthm1 = 63; 62 } 63 le_bit = ~data & widthm1; 64 65 env->cr[CR_EIRR] |= 1ull << le_bit; 66 eval_interrupt(cpu); 67 } 68 69 const MemoryRegionOps hppa_io_eir_ops = { 70 .read = io_eir_read, 71 .write = io_eir_write, 72 .valid.min_access_size = 4, 73 .valid.max_access_size = 4, 74 .impl.min_access_size = 4, 75 .impl.max_access_size = 4, 76 }; 77 78 void hppa_cpu_alarm_timer(void *opaque) 79 { 80 /* Raise interrupt 0. */ 81 io_eir_write(opaque, 0, 0, 4); 82 } 83 84 void HELPER(write_eirr)(CPUHPPAState *env, target_ulong val) 85 { 86 env->cr[CR_EIRR] &= ~val; 87 qemu_mutex_lock_iothread(); 88 eval_interrupt(env_archcpu(env)); 89 qemu_mutex_unlock_iothread(); 90 } 91 92 void HELPER(write_eiem)(CPUHPPAState *env, target_ulong val) 93 { 94 env->cr[CR_EIEM] = val; 95 qemu_mutex_lock_iothread(); 96 eval_interrupt(env_archcpu(env)); 97 qemu_mutex_unlock_iothread(); 98 } 99 100 void hppa_cpu_do_interrupt(CPUState *cs) 101 { 102 HPPACPU *cpu = HPPA_CPU(cs); 103 CPUHPPAState *env = &cpu->env; 104 int i = cs->exception_index; 105 uint64_t old_psw; 106 107 /* As documented in pa2.0 -- interruption handling. */ 108 /* step 1 */ 109 env->cr[CR_IPSW] = old_psw = cpu_hppa_get_psw(env); 110 111 /* step 2 -- Note PSW_W is masked out again for pa1.x */ 112 cpu_hppa_put_psw(env, 113 (env->cr[CR_PSW_DEFAULT] & PDC_PSW_WIDE_BIT ? PSW_W : 0) | 114 (i == EXCP_HPMC ? PSW_M : 0)); 115 116 /* step 3 */ 117 /* 118 * For pa1.x, IIASQ is simply a copy of IASQ. 119 * For pa2.0, IIASQ is the top bits of the virtual address, 120 * or zero if translation is disabled. 121 */ 122 if (!hppa_is_pa20(env)) { 123 env->cr[CR_IIASQ] = env->iasq_f >> 32; 124 env->cr_back[0] = env->iasq_b >> 32; 125 } else if (old_psw & PSW_C) { 126 env->cr[CR_IIASQ] = 127 hppa_form_gva_psw(old_psw, env->iasq_f, env->iaoq_f) >> 32; 128 env->cr_back[0] = 129 hppa_form_gva_psw(old_psw, env->iasq_b, env->iaoq_b) >> 32; 130 } else { 131 env->cr[CR_IIASQ] = 0; 132 env->cr_back[0] = 0; 133 } 134 env->cr[CR_IIAOQ] = env->iaoq_f; 135 env->cr_back[1] = env->iaoq_b; 136 137 if (old_psw & PSW_Q) { 138 /* step 5 */ 139 /* ISR and IOR will be set elsewhere. */ 140 switch (i) { 141 case EXCP_ILL: 142 case EXCP_BREAK: 143 case EXCP_PRIV_REG: 144 case EXCP_PRIV_OPR: 145 /* IIR set via translate.c. */ 146 break; 147 148 case EXCP_OVERFLOW: 149 case EXCP_COND: 150 case EXCP_ASSIST: 151 case EXCP_DTLB_MISS: 152 case EXCP_NA_ITLB_MISS: 153 case EXCP_NA_DTLB_MISS: 154 case EXCP_DMAR: 155 case EXCP_DMPI: 156 case EXCP_UNALIGN: 157 case EXCP_DMP: 158 case EXCP_DMB: 159 case EXCP_TLB_DIRTY: 160 case EXCP_PAGE_REF: 161 case EXCP_ASSIST_EMU: 162 { 163 /* Avoid reading directly from the virtual address, lest we 164 raise another exception from some sort of TLB issue. */ 165 /* ??? An alternate fool-proof method would be to store the 166 instruction data into the unwind info. That's probably 167 a bit too much in the way of extra storage required. */ 168 vaddr vaddr = env->iaoq_f & -4; 169 hwaddr paddr = vaddr; 170 171 if (old_psw & PSW_C) { 172 int prot, t; 173 174 vaddr = hppa_form_gva_psw(old_psw, env->iasq_f, vaddr); 175 t = hppa_get_physical_address(env, vaddr, MMU_KERNEL_IDX, 176 0, &paddr, &prot, NULL); 177 if (t >= 0) { 178 /* We can't re-load the instruction. */ 179 env->cr[CR_IIR] = 0; 180 break; 181 } 182 } 183 env->cr[CR_IIR] = ldl_phys(cs->as, paddr); 184 } 185 break; 186 187 default: 188 /* Other exceptions do not set IIR. */ 189 break; 190 } 191 192 /* step 6 */ 193 env->shadow[0] = env->gr[1]; 194 env->shadow[1] = env->gr[8]; 195 env->shadow[2] = env->gr[9]; 196 env->shadow[3] = env->gr[16]; 197 env->shadow[4] = env->gr[17]; 198 env->shadow[5] = env->gr[24]; 199 env->shadow[6] = env->gr[25]; 200 } 201 202 /* step 7 */ 203 if (i == EXCP_TOC) { 204 env->iaoq_f = hppa_form_gva(env, 0, FIRMWARE_START); 205 /* help SeaBIOS and provide iaoq_b and iasq_back in shadow regs */ 206 env->gr[24] = env->cr_back[0]; 207 env->gr[25] = env->cr_back[1]; 208 } else { 209 env->iaoq_f = hppa_form_gva(env, 0, env->cr[CR_IVA] + 32 * i); 210 } 211 env->iaoq_b = hppa_form_gva(env, 0, env->iaoq_f + 4); 212 env->iasq_f = 0; 213 env->iasq_b = 0; 214 215 if (qemu_loglevel_mask(CPU_LOG_INT)) { 216 static const char * const names[] = { 217 [EXCP_HPMC] = "high priority machine check", 218 [EXCP_POWER_FAIL] = "power fail interrupt", 219 [EXCP_RC] = "recovery counter trap", 220 [EXCP_EXT_INTERRUPT] = "external interrupt", 221 [EXCP_LPMC] = "low priority machine check", 222 [EXCP_ITLB_MISS] = "instruction tlb miss fault", 223 [EXCP_IMP] = "instruction memory protection trap", 224 [EXCP_ILL] = "illegal instruction trap", 225 [EXCP_BREAK] = "break instruction trap", 226 [EXCP_PRIV_OPR] = "privileged operation trap", 227 [EXCP_PRIV_REG] = "privileged register trap", 228 [EXCP_OVERFLOW] = "overflow trap", 229 [EXCP_COND] = "conditional trap", 230 [EXCP_ASSIST] = "assist exception trap", 231 [EXCP_DTLB_MISS] = "data tlb miss fault", 232 [EXCP_NA_ITLB_MISS] = "non-access instruction tlb miss", 233 [EXCP_NA_DTLB_MISS] = "non-access data tlb miss", 234 [EXCP_DMP] = "data memory protection trap", 235 [EXCP_DMB] = "data memory break trap", 236 [EXCP_TLB_DIRTY] = "tlb dirty bit trap", 237 [EXCP_PAGE_REF] = "page reference trap", 238 [EXCP_ASSIST_EMU] = "assist emulation trap", 239 [EXCP_HPT] = "high-privilege transfer trap", 240 [EXCP_LPT] = "low-privilege transfer trap", 241 [EXCP_TB] = "taken branch trap", 242 [EXCP_DMAR] = "data memory access rights trap", 243 [EXCP_DMPI] = "data memory protection id trap", 244 [EXCP_UNALIGN] = "unaligned data reference trap", 245 [EXCP_PER_INTERRUPT] = "performance monitor interrupt", 246 [EXCP_SYSCALL] = "syscall", 247 [EXCP_SYSCALL_LWS] = "syscall-lws", 248 [EXCP_TOC] = "TOC (transfer of control)", 249 }; 250 static int count; 251 const char *name = NULL; 252 char unknown[16]; 253 254 if (i >= 0 && i < ARRAY_SIZE(names)) { 255 name = names[i]; 256 } 257 if (!name) { 258 snprintf(unknown, sizeof(unknown), "unknown %d", i); 259 name = unknown; 260 } 261 qemu_log("INT %6d: %s @ " TARGET_FMT_lx ":" TARGET_FMT_lx 262 " for " TARGET_FMT_lx ":" TARGET_FMT_lx "\n", 263 ++count, name, env->cr[CR_IIASQ], env->cr[CR_IIAOQ], 264 env->cr[CR_ISR], env->cr[CR_IOR]); 265 } 266 cs->exception_index = -1; 267 } 268 269 bool hppa_cpu_exec_interrupt(CPUState *cs, int interrupt_request) 270 { 271 HPPACPU *cpu = HPPA_CPU(cs); 272 CPUHPPAState *env = &cpu->env; 273 274 if (interrupt_request & CPU_INTERRUPT_NMI) { 275 /* Raise TOC (NMI) interrupt */ 276 cpu_reset_interrupt(cs, CPU_INTERRUPT_NMI); 277 cs->exception_index = EXCP_TOC; 278 hppa_cpu_do_interrupt(cs); 279 return true; 280 } 281 282 /* If interrupts are requested and enabled, raise them. */ 283 if ((env->psw & PSW_I) && (interrupt_request & CPU_INTERRUPT_HARD)) { 284 cs->exception_index = EXCP_EXT_INTERRUPT; 285 hppa_cpu_do_interrupt(cs); 286 return true; 287 } 288 return false; 289 } 290