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 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 "cpu.h" 23 #include "exec/exec-all.h" 24 #include "exec/helper-proto.h" 25 #include "qom/cpu.h" 26 27 #ifndef CONFIG_USER_ONLY 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 controler (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 int le_bit = ~data & (TARGET_REGISTER_BITS - 1); 56 57 cpu->env.cr[CR_EIRR] |= (target_ureg)1 << le_bit; 58 eval_interrupt(cpu); 59 } 60 61 const MemoryRegionOps hppa_io_eir_ops = { 62 .read = io_eir_read, 63 .write = io_eir_write, 64 .valid.min_access_size = 4, 65 .valid.max_access_size = 4, 66 .impl.min_access_size = 4, 67 .impl.max_access_size = 4, 68 }; 69 70 void hppa_cpu_alarm_timer(void *opaque) 71 { 72 /* Raise interrupt 0. */ 73 io_eir_write(opaque, 0, 0, 4); 74 } 75 76 void HELPER(write_eirr)(CPUHPPAState *env, target_ureg val) 77 { 78 env->cr[CR_EIRR] &= ~val; 79 qemu_mutex_lock_iothread(); 80 eval_interrupt(hppa_env_get_cpu(env)); 81 qemu_mutex_unlock_iothread(); 82 } 83 84 void HELPER(write_eiem)(CPUHPPAState *env, target_ureg val) 85 { 86 env->cr[CR_EIEM] = val; 87 qemu_mutex_lock_iothread(); 88 eval_interrupt(hppa_env_get_cpu(env)); 89 qemu_mutex_unlock_iothread(); 90 } 91 #endif /* !CONFIG_USER_ONLY */ 92 93 void hppa_cpu_do_interrupt(CPUState *cs) 94 { 95 HPPACPU *cpu = HPPA_CPU(cs); 96 CPUHPPAState *env = &cpu->env; 97 int i = cs->exception_index; 98 target_ureg iaoq_f = env->iaoq_f; 99 target_ureg iaoq_b = env->iaoq_b; 100 uint64_t iasq_f = env->iasq_f; 101 uint64_t iasq_b = env->iasq_b; 102 103 #ifndef CONFIG_USER_ONLY 104 target_ureg old_psw; 105 106 /* As documented in pa2.0 -- interruption handling. */ 107 /* step 1 */ 108 env->cr[CR_IPSW] = old_psw = cpu_hppa_get_psw(env); 109 110 /* step 2 -- note PSW_W == 0 for !HPPA64. */ 111 cpu_hppa_put_psw(env, PSW_W | (i == EXCP_HPMC ? PSW_M : 0)); 112 113 /* step 3 */ 114 env->cr[CR_IIASQ] = iasq_f >> 32; 115 env->cr_back[0] = iasq_b >> 32; 116 env->cr[CR_IIAOQ] = iaoq_f; 117 env->cr_back[1] = iaoq_b; 118 119 if (old_psw & PSW_Q) { 120 /* step 5 */ 121 /* ISR and IOR will be set elsewhere. */ 122 switch (i) { 123 case EXCP_ILL: 124 case EXCP_BREAK: 125 case EXCP_PRIV_REG: 126 case EXCP_PRIV_OPR: 127 /* IIR set via translate.c. */ 128 break; 129 130 case EXCP_OVERFLOW: 131 case EXCP_COND: 132 case EXCP_ASSIST: 133 case EXCP_DTLB_MISS: 134 case EXCP_NA_ITLB_MISS: 135 case EXCP_NA_DTLB_MISS: 136 case EXCP_DMAR: 137 case EXCP_DMPI: 138 case EXCP_UNALIGN: 139 case EXCP_DMP: 140 case EXCP_DMB: 141 case EXCP_TLB_DIRTY: 142 case EXCP_PAGE_REF: 143 case EXCP_ASSIST_EMU: 144 { 145 /* Avoid reading directly from the virtual address, lest we 146 raise another exception from some sort of TLB issue. */ 147 /* ??? An alternate fool-proof method would be to store the 148 instruction data into the unwind info. That's probably 149 a bit too much in the way of extra storage required. */ 150 vaddr vaddr; 151 hwaddr paddr; 152 153 paddr = vaddr = iaoq_f & -4; 154 if (old_psw & PSW_C) { 155 int prot, t; 156 157 vaddr = hppa_form_gva_psw(old_psw, iasq_f, vaddr); 158 t = hppa_get_physical_address(env, vaddr, MMU_KERNEL_IDX, 159 0, &paddr, &prot); 160 if (t >= 0) { 161 /* We can't re-load the instruction. */ 162 env->cr[CR_IIR] = 0; 163 break; 164 } 165 } 166 env->cr[CR_IIR] = ldl_phys(cs->as, paddr); 167 } 168 break; 169 170 default: 171 /* Other exceptions do not set IIR. */ 172 break; 173 } 174 175 /* step 6 */ 176 env->shadow[0] = env->gr[1]; 177 env->shadow[1] = env->gr[8]; 178 env->shadow[2] = env->gr[9]; 179 env->shadow[3] = env->gr[16]; 180 env->shadow[4] = env->gr[17]; 181 env->shadow[5] = env->gr[24]; 182 env->shadow[6] = env->gr[25]; 183 } 184 185 /* step 7 */ 186 env->iaoq_f = env->cr[CR_IVA] + 32 * i; 187 env->iaoq_b = env->iaoq_f + 4; 188 env->iasq_f = 0; 189 env->iasq_b = 0; 190 #endif 191 192 if (qemu_loglevel_mask(CPU_LOG_INT)) { 193 static const char * const names[] = { 194 [EXCP_HPMC] = "high priority machine check", 195 [EXCP_POWER_FAIL] = "power fail interrupt", 196 [EXCP_RC] = "recovery counter trap", 197 [EXCP_EXT_INTERRUPT] = "external interrupt", 198 [EXCP_LPMC] = "low priority machine check", 199 [EXCP_ITLB_MISS] = "instruction tlb miss fault", 200 [EXCP_IMP] = "instruction memory protection trap", 201 [EXCP_ILL] = "illegal instruction trap", 202 [EXCP_BREAK] = "break instruction trap", 203 [EXCP_PRIV_OPR] = "privileged operation trap", 204 [EXCP_PRIV_REG] = "privileged register trap", 205 [EXCP_OVERFLOW] = "overflow trap", 206 [EXCP_COND] = "conditional trap", 207 [EXCP_ASSIST] = "assist exception trap", 208 [EXCP_DTLB_MISS] = "data tlb miss fault", 209 [EXCP_NA_ITLB_MISS] = "non-access instruction tlb miss", 210 [EXCP_NA_DTLB_MISS] = "non-access data tlb miss", 211 [EXCP_DMP] = "data memory protection trap", 212 [EXCP_DMB] = "data memory break trap", 213 [EXCP_TLB_DIRTY] = "tlb dirty bit trap", 214 [EXCP_PAGE_REF] = "page reference trap", 215 [EXCP_ASSIST_EMU] = "assist emulation trap", 216 [EXCP_HPT] = "high-privilege transfer trap", 217 [EXCP_LPT] = "low-privilege transfer trap", 218 [EXCP_TB] = "taken branch trap", 219 [EXCP_DMAR] = "data memory access rights trap", 220 [EXCP_DMPI] = "data memory protection id trap", 221 [EXCP_UNALIGN] = "unaligned data reference trap", 222 [EXCP_PER_INTERRUPT] = "performance monitor interrupt", 223 [EXCP_SYSCALL] = "syscall", 224 [EXCP_SYSCALL_LWS] = "syscall-lws", 225 }; 226 static int count; 227 const char *name = NULL; 228 char unknown[16]; 229 230 if (i >= 0 && i < ARRAY_SIZE(names)) { 231 name = names[i]; 232 } 233 if (!name) { 234 snprintf(unknown, sizeof(unknown), "unknown %d", i); 235 name = unknown; 236 } 237 qemu_log("INT %6d: %s @ " TARGET_FMT_lx "," TARGET_FMT_lx 238 " -> " TREG_FMT_lx " " TARGET_FMT_lx "\n", 239 ++count, name, 240 hppa_form_gva(env, iasq_f, iaoq_f), 241 hppa_form_gva(env, iasq_b, iaoq_b), 242 env->iaoq_f, 243 hppa_form_gva(env, (uint64_t)env->cr[CR_ISR] << 32, 244 env->cr[CR_IOR])); 245 } 246 cs->exception_index = -1; 247 } 248 249 bool hppa_cpu_exec_interrupt(CPUState *cs, int interrupt_request) 250 { 251 #ifndef CONFIG_USER_ONLY 252 HPPACPU *cpu = HPPA_CPU(cs); 253 CPUHPPAState *env = &cpu->env; 254 255 /* If interrupts are requested and enabled, raise them. */ 256 if ((env->psw & PSW_I) && (interrupt_request & CPU_INTERRUPT_HARD)) { 257 cs->exception_index = EXCP_EXT_INTERRUPT; 258 hppa_cpu_do_interrupt(cs); 259 return true; 260 } 261 #endif 262 return false; 263 } 264