2 * MicroBlaze helper routines.
5 * Copyright (c) 2009-2012 PetaLogix Qld Pty Ltd.
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
21 #include "qemu/osdep.h"
23 #include "exec/exec-all.h"
24 #include "qemu/host-utils.h"
27 #ifndef CONFIG_USER_ONLY
28 static bool mb_cpu_access_is_secure(MicroBlazeCPU *cpu,
29 MMUAccessType access_type)
31 if (access_type == MMU_INST_FETCH) {
32 return !cpu->ns_axi_ip;
34 return !cpu->ns_axi_dp;
38 bool mb_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
39 MMUAccessType access_type, int mmu_idx,
40 bool probe, uintptr_t retaddr)
42 MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
43 CPUMBState *env = &cpu->env;
44 MicroBlazeMMULookup lu;
47 MemTxAttrs attrs = {};
49 attrs.secure = mb_cpu_access_is_secure(cpu, access_type);
51 if (mmu_idx == MMU_NOMMU_IDX) {
52 /* MMU disabled or not available. */
53 address &= TARGET_PAGE_MASK;
55 tlb_set_page_with_attrs(cs, address, address, attrs, prot, mmu_idx,
60 hit = mmu_translate(cpu, &lu, address, access_type, mmu_idx);
62 uint32_t vaddr = address & TARGET_PAGE_MASK;
63 uint32_t paddr = lu.paddr + vaddr - lu.vaddr;
65 qemu_log_mask(CPU_LOG_MMU, "MMU map mmu=%d v=%x p=%x prot=%x\n",
66 mmu_idx, vaddr, paddr, lu.prot);
67 tlb_set_page_with_attrs(cs, vaddr, paddr, attrs, lu.prot, mmu_idx,
77 qemu_log_mask(CPU_LOG_MMU, "mmu=%d miss v=%" VADDR_PRIx "\n",
83 env->esr = access_type == MMU_INST_FETCH ? 17 : 16;
84 env->esr |= (access_type == MMU_DATA_STORE) << 10;
87 env->esr = access_type == MMU_INST_FETCH ? 19 : 18;
88 env->esr |= (access_type == MMU_DATA_STORE) << 10;
94 if (cs->exception_index == EXCP_MMU) {
95 cpu_abort(cs, "recursive faults\n");
99 cs->exception_index = EXCP_MMU;
100 cpu_loop_exit_restore(cs, retaddr);
103 void mb_cpu_do_interrupt(CPUState *cs)
105 MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
106 CPUMBState *env = &cpu->env;
107 uint32_t t, msr = mb_cpu_read_msr(env);
110 /* IMM flag cannot propagate across a branch and into the dslot. */
111 assert((env->iflags & (D_FLAG | IMM_FLAG)) != (D_FLAG | IMM_FLAG));
112 /* BIMM flag cannot be set without D_FLAG. */
113 assert((env->iflags & (D_FLAG | BIMM_FLAG)) != BIMM_FLAG);
114 /* RTI flags are private to translate. */
115 assert(!(env->iflags & (DRTI_FLAG | DRTE_FLAG | DRTB_FLAG)));
117 switch (cs->exception_index) {
119 if (!(cpu->cfg.pvr_regs[0] & PVR0_USE_EXC_MASK)) {
120 qemu_log_mask(LOG_GUEST_ERROR,
121 "Exception raised on system without exceptions!\n");
125 qemu_log_mask(CPU_LOG_INT,
126 "INT: HWE at pc=%08x msr=%08x iflags=%x\n",
127 env->pc, msr, env->iflags);
129 /* Exception breaks branch + dslot sequence? */
132 if (env->iflags & D_FLAG) {
134 env->btr = env->btarget;
137 /* Exception in progress. */
139 env->regs[17] = env->pc + 4;
140 env->pc = cpu->cfg.base_vectors + 0x20;
144 qemu_log_mask(CPU_LOG_INT,
145 "INT: MMU at pc=%08x msr=%08x "
146 "ear=%" PRIx64 " iflags=%x\n",
147 env->pc, msr, env->ear, env->iflags);
149 /* Exception breaks branch + dslot sequence? */
152 if (env->iflags & D_FLAG) {
154 env->btr = env->btarget;
155 /* Reexecute the branch. */
156 env->regs[17] = env->pc - (env->iflags & BIMM_FLAG ? 8 : 4);
157 } else if (env->iflags & IMM_FLAG) {
158 /* Reexecute the imm. */
159 env->regs[17] = env->pc - 4;
161 env->regs[17] = env->pc;
164 /* Exception in progress. */
166 env->pc = cpu->cfg.base_vectors + 0x20;
170 assert(!(msr & (MSR_EIP | MSR_BIP)));
171 assert(msr & MSR_IE);
172 assert(!(env->iflags & (D_FLAG | IMM_FLAG)));
174 qemu_log_mask(CPU_LOG_INT,
175 "INT: DEV at pc=%08x msr=%08x iflags=%x\n",
176 env->pc, msr, env->iflags);
179 /* Disable interrupts. */
181 env->regs[14] = env->pc;
182 env->pc = cpu->cfg.base_vectors + 0x10;
186 assert(!(env->iflags & (D_FLAG | IMM_FLAG)));
188 qemu_log_mask(CPU_LOG_INT,
189 "INT: BRK at pc=%08x msr=%08x iflags=%x\n",
190 env->pc, msr, env->iflags);
193 /* Break in progress. */
195 env->regs[16] = env->pc;
196 env->pc = cpu->cfg.base_vectors + 0x18;
200 cpu_abort(cs, "unhandled exception type=%d\n", cs->exception_index);
204 /* Save previous mode, disable mmu, disable user-mode. */
205 t = (msr & (MSR_VM | MSR_UM)) << 1;
206 msr &= ~(MSR_VMS | MSR_UMS | MSR_VM | MSR_UM);
208 mb_cpu_write_msr(env, msr);
210 env->res_addr = RES_ADDR_NONE;
214 qemu_log_mask(CPU_LOG_INT,
215 " to pc=%08x msr=%08x\n", env->pc, msr);
216 } else if (env->esr & D_FLAG) {
217 qemu_log_mask(CPU_LOG_INT,
218 " to pc=%08x msr=%08x esr=%04x btr=%08x\n",
219 env->pc, msr, env->esr, env->btr);
221 qemu_log_mask(CPU_LOG_INT,
222 " to pc=%08x msr=%08x esr=%04x\n",
223 env->pc, msr, env->esr);
227 hwaddr mb_cpu_get_phys_page_attrs_debug(CPUState *cs, vaddr addr,
230 MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
231 CPUMBState *env = &cpu->env;
232 target_ulong vaddr, paddr = 0;
233 MicroBlazeMMULookup lu;
234 int mmu_idx = cpu_mmu_index(env, false);
237 /* Caller doesn't initialize */
238 *attrs = (MemTxAttrs) {};
239 attrs->secure = mb_cpu_access_is_secure(cpu, MMU_DATA_LOAD);
241 if (mmu_idx != MMU_NOMMU_IDX) {
242 hit = mmu_translate(cpu, &lu, addr, 0, 0);
244 vaddr = addr & TARGET_PAGE_MASK;
245 paddr = lu.paddr + vaddr - lu.vaddr;
247 paddr = 0; /* ???. */
249 paddr = addr & TARGET_PAGE_MASK;
254 bool mb_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
256 MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
257 CPUMBState *env = &cpu->env;
259 if ((interrupt_request & CPU_INTERRUPT_HARD)
260 && (env->msr & MSR_IE)
261 && !(env->msr & (MSR_EIP | MSR_BIP))
262 && !(env->iflags & (D_FLAG | IMM_FLAG))) {
263 cs->exception_index = EXCP_IRQ;
264 mb_cpu_do_interrupt(cs);
270 #endif /* !CONFIG_USER_ONLY */
272 void mb_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
273 MMUAccessType access_type,
274 int mmu_idx, uintptr_t retaddr)
276 MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
277 uint32_t esr, iflags;
279 /* Recover the pc and iflags from the corresponding insn_start. */
280 cpu_restore_state(cs, retaddr, true);
281 iflags = cpu->env.iflags;
283 qemu_log_mask(CPU_LOG_INT,
284 "Unaligned access addr=" TARGET_FMT_lx " pc=%x iflags=%x\n",
285 (target_ulong)addr, cpu->env.pc, iflags);
287 esr = ESR_EC_UNALIGNED_DATA;
288 if (likely(iflags & ESR_ESS_FLAG)) {
289 esr |= iflags & ESR_ESS_MASK;
291 qemu_log_mask(LOG_UNIMP, "Unaligned access without ESR_ESS_FLAG\n");
296 cs->exception_index = EXCP_HW_EXCP;