/* * QEMU Nios II CPU * * Copyright (c) 2012 Chris Wulff * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, see * */ #include "qemu/osdep.h" #include "qemu/module.h" #include "qapi/error.h" #include "cpu.h" #include "exec/log.h" #include "exec/gdbstub.h" #include "hw/qdev-properties.h" static void nios2_cpu_set_pc(CPUState *cs, vaddr value) { Nios2CPU *cpu = NIOS2_CPU(cs); CPUNios2State *env = &cpu->env; env->regs[R_PC] = value; } static bool nios2_cpu_has_work(CPUState *cs) { return cs->interrupt_request & (CPU_INTERRUPT_HARD | CPU_INTERRUPT_NMI); } /* CPUClass::reset() */ static void nios2_cpu_reset(CPUState *cs) { Nios2CPU *cpu = NIOS2_CPU(cs); Nios2CPUClass *ncc = NIOS2_CPU_GET_CLASS(cpu); CPUNios2State *env = &cpu->env; if (qemu_loglevel_mask(CPU_LOG_RESET)) { qemu_log("CPU Reset (CPU %d)\n", cs->cpu_index); log_cpu_state(cs, 0); } ncc->parent_reset(cs); memset(env->regs, 0, sizeof(uint32_t) * NUM_CORE_REGS); env->regs[R_PC] = cpu->reset_addr; #if defined(CONFIG_USER_ONLY) /* Start in user mode with interrupts enabled. */ env->regs[CR_STATUS] = CR_STATUS_U | CR_STATUS_PIE; #else env->regs[CR_STATUS] = 0; #endif } static void nios2_cpu_initfn(Object *obj) { Nios2CPU *cpu = NIOS2_CPU(obj); cpu_set_cpustate_pointers(cpu); #if !defined(CONFIG_USER_ONLY) mmu_init(&cpu->env); #endif } static ObjectClass *nios2_cpu_class_by_name(const char *cpu_model) { return object_class_by_name(TYPE_NIOS2_CPU); } static void nios2_cpu_realizefn(DeviceState *dev, Error **errp) { CPUState *cs = CPU(dev); Nios2CPUClass *ncc = NIOS2_CPU_GET_CLASS(dev); Error *local_err = NULL; cpu_exec_realizefn(cs, &local_err); if (local_err != NULL) { error_propagate(errp, local_err); return; } qemu_init_vcpu(cs); cpu_reset(cs); ncc->parent_realize(dev, errp); } static bool nios2_cpu_exec_interrupt(CPUState *cs, int interrupt_request) { Nios2CPU *cpu = NIOS2_CPU(cs); CPUNios2State *env = &cpu->env; if ((interrupt_request & CPU_INTERRUPT_HARD) && (env->regs[CR_STATUS] & CR_STATUS_PIE)) { cs->exception_index = EXCP_IRQ; nios2_cpu_do_interrupt(cs); return true; } return false; } static void nios2_cpu_disas_set_info(CPUState *cpu, disassemble_info *info) { /* NOTE: NiosII R2 is not supported yet. */ info->mach = bfd_arch_nios2; #ifdef TARGET_WORDS_BIGENDIAN info->print_insn = print_insn_big_nios2; #else info->print_insn = print_insn_little_nios2; #endif } static int nios2_cpu_gdb_read_register(CPUState *cs, uint8_t *mem_buf, int n) { Nios2CPU *cpu = NIOS2_CPU(cs); CPUClass *cc = CPU_GET_CLASS(cs); CPUNios2State *env = &cpu->env; if (n > cc->gdb_num_core_regs) { return 0; } if (n < 32) { /* GP regs */ return gdb_get_reg32(mem_buf, env->regs[n]); } else if (n == 32) { /* PC */ return gdb_get_reg32(mem_buf, env->regs[R_PC]); } else if (n < 49) { /* Status regs */ return gdb_get_reg32(mem_buf, env->regs[n - 1]); } /* Invalid regs */ return 0; } static int nios2_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n) { Nios2CPU *cpu = NIOS2_CPU(cs); CPUClass *cc = CPU_GET_CLASS(cs); CPUNios2State *env = &cpu->env; if (n > cc->gdb_num_core_regs) { return 0; } if (n < 32) { /* GP regs */ env->regs[n] = ldl_p(mem_buf); } else if (n == 32) { /* PC */ env->regs[R_PC] = ldl_p(mem_buf); } else if (n < 49) { /* Status regs */ env->regs[n - 1] = ldl_p(mem_buf); } return 4; } static Property nios2_properties[] = { DEFINE_PROP_BOOL("mmu_present", Nios2CPU, mmu_present, true), /* ALTR,pid-num-bits */ DEFINE_PROP_UINT32("mmu_pid_num_bits", Nios2CPU, pid_num_bits, 8), /* ALTR,tlb-num-ways */ DEFINE_PROP_UINT32("mmu_tlb_num_ways", Nios2CPU, tlb_num_ways, 16), /* ALTR,tlb-num-entries */ DEFINE_PROP_UINT32("mmu_pid_num_entries", Nios2CPU, tlb_num_entries, 256), DEFINE_PROP_END_OF_LIST(), }; static void nios2_cpu_class_init(ObjectClass *oc, void *data) { DeviceClass *dc = DEVICE_CLASS(oc); CPUClass *cc = CPU_CLASS(oc); Nios2CPUClass *ncc = NIOS2_CPU_CLASS(oc); device_class_set_parent_realize(dc, nios2_cpu_realizefn, &ncc->parent_realize); dc->props = nios2_properties; cpu_class_set_parent_reset(cc, nios2_cpu_reset, &ncc->parent_reset); cc->class_by_name = nios2_cpu_class_by_name; cc->has_work = nios2_cpu_has_work; cc->do_interrupt = nios2_cpu_do_interrupt; cc->cpu_exec_interrupt = nios2_cpu_exec_interrupt; cc->dump_state = nios2_cpu_dump_state; cc->set_pc = nios2_cpu_set_pc; cc->disas_set_info = nios2_cpu_disas_set_info; cc->tlb_fill = nios2_cpu_tlb_fill; #ifndef CONFIG_USER_ONLY cc->do_unaligned_access = nios2_cpu_do_unaligned_access; cc->get_phys_page_debug = nios2_cpu_get_phys_page_debug; #endif cc->gdb_read_register = nios2_cpu_gdb_read_register; cc->gdb_write_register = nios2_cpu_gdb_write_register; cc->gdb_num_core_regs = 49; cc->tcg_initialize = nios2_tcg_init; } static const TypeInfo nios2_cpu_type_info = { .name = TYPE_NIOS2_CPU, .parent = TYPE_CPU, .instance_size = sizeof(Nios2CPU), .instance_init = nios2_cpu_initfn, .class_size = sizeof(Nios2CPUClass), .class_init = nios2_cpu_class_init, }; static void nios2_cpu_register_types(void) { type_register_static(&nios2_cpu_type_info); } type_init(nios2_cpu_register_types)