target-microblaze/cpu.c

   1 /*
   2  * QEMU MicroBlaze CPU
   3  *
   4  * Copyright (c) 2009 Edgar E. Iglesias
   5  * Copyright (c) 2009-2012 PetaLogix Qld Pty Ltd.
   6  * Copyright (c) 2012 SUSE LINUX Products GmbH
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, see
  20  * <http://www.gnu.org/licenses/lgpl-2.1.html>
  21  */
  22
  23 #include "cpu.h"
  24 #include "qemu-common.h"
  25 #include "migration/vmstate.h"
  26
  27
  28 /* CPUClass::reset() */
  29 static void mb_cpu_reset(CPUState *s)
  30 {
  31     MicroBlazeCPU *cpu = MICROBLAZE_CPU(s);
  32     MicroBlazeCPUClass *mcc = MICROBLAZE_CPU_GET_CLASS(cpu);
  33     CPUMBState *env = &cpu->env;
  34
  35     if (qemu_loglevel_mask(CPU_LOG_RESET)) {
  36         qemu_log("CPU Reset (CPU %d)\n", s->cpu_index);
  37         log_cpu_state(env, 0);
  38     }
  39
  40     mcc->parent_reset(s);
  41
  42     memset(env, 0, offsetof(CPUMBState, breakpoints));
  43     env->res_addr = RES_ADDR_NONE;
  44     tlb_flush(env, 1);
  45
  46     /* Disable stack protector.  */
  47     env->shr = ~0;
  48
  49     env->pvr.regs[0] = PVR0_PVR_FULL_MASK \
  50                        | PVR0_USE_BARREL_MASK \
  51                        | PVR0_USE_DIV_MASK \
  52                        | PVR0_USE_HW_MUL_MASK \
  53                        | PVR0_USE_EXC_MASK \
  54                        | PVR0_USE_ICACHE_MASK \
  55                        | PVR0_USE_DCACHE_MASK \
  56                        | PVR0_USE_MMU \
  57                        | (0xb << 8);
  58     env->pvr.regs[2] = PVR2_D_OPB_MASK \
  59                         | PVR2_D_LMB_MASK \
  60                         | PVR2_I_OPB_MASK \
  61                         | PVR2_I_LMB_MASK \
  62                         | PVR2_USE_MSR_INSTR \
  63                         | PVR2_USE_PCMP_INSTR \
  64                         | PVR2_USE_BARREL_MASK \
  65                         | PVR2_USE_DIV_MASK \
  66                         | PVR2_USE_HW_MUL_MASK \
  67                         | PVR2_USE_MUL64_MASK \
  68                         | PVR2_USE_FPU_MASK \
  69                         | PVR2_USE_FPU2_MASK \
  70                         | PVR2_FPU_EXC_MASK \
  71                         | 0;
  72     env->pvr.regs[10] = 0x0c000000; /* Default to spartan 3a dsp family.  */
  73     env->pvr.regs[11] = PVR11_USE_MMU | (16 << 17);
  74
  75 #if defined(CONFIG_USER_ONLY)
  76     /* start in user mode with interrupts enabled.  */
  77     env->sregs[SR_MSR] = MSR_EE | MSR_IE | MSR_VM | MSR_UM;
  78     env->pvr.regs[10] = 0x0c000000; /* Spartan 3a dsp.  */
  79 #else
  80     env->sregs[SR_MSR] = 0;
  81     mmu_init(&env->mmu);
  82     env->mmu.c_mmu = 3;
  83     env->mmu.c_mmu_tlb_access = 3;
  84     env->mmu.c_mmu_zones = 16;
  85 #endif
  86 }
  87
  88 static void mb_cpu_realizefn(DeviceState *dev, Error **errp)
  89 {
  90     MicroBlazeCPU *cpu = MICROBLAZE_CPU(dev);
  91     MicroBlazeCPUClass *mcc = MICROBLAZE_CPU_GET_CLASS(dev);
  92
  93     cpu_reset(CPU(cpu));
  94     qemu_init_vcpu(&cpu->env);
  95
  96     mcc->parent_realize(dev, errp);
  97 }
  98
  99 static void mb_cpu_initfn(Object *obj)
 100 {
 101     CPUState *cs = CPU(obj);
 102     MicroBlazeCPU *cpu = MICROBLAZE_CPU(obj);
 103     CPUMBState *env = &cpu->env;
 104     static bool tcg_initialized;
 105
 106     cs->env_ptr = env;
 107     cpu_exec_init(env);
 108
 109     set_float_rounding_mode(float_round_nearest_even, &env->fp_status);
 110
 111     if (tcg_enabled() && !tcg_initialized) {
 112         tcg_initialized = true;
 113         mb_tcg_init();
 114     }
 115 }
 116
 117 static const VMStateDescription vmstate_mb_cpu = {
 118     .name = "cpu",
 119     .unmigratable = 1,
 120 };
 121
 122 static void mb_cpu_class_init(ObjectClass *oc, void *data)
 123 {
 124     DeviceClass *dc = DEVICE_CLASS(oc);
 125     CPUClass *cc = CPU_CLASS(oc);
 126     MicroBlazeCPUClass *mcc = MICROBLAZE_CPU_CLASS(oc);
 127
 128     mcc->parent_realize = dc->realize;
 129     dc->realize = mb_cpu_realizefn;
 130
 131     mcc->parent_reset = cc->reset;
 132     cc->reset = mb_cpu_reset;
 133
 134     cc->do_interrupt = mb_cpu_do_interrupt;
 135     dc->vmsd = &vmstate_mb_cpu;
 136 }
 137
 138 static const TypeInfo mb_cpu_type_info = {
 139     .name = TYPE_MICROBLAZE_CPU,
 140     .parent = TYPE_CPU,
 141     .instance_size = sizeof(MicroBlazeCPU),
 142     .instance_init = mb_cpu_initfn,
 143     .class_size = sizeof(MicroBlazeCPUClass),
 144     .class_init = mb_cpu_class_init,
 145 };
 146
 147 static void mb_cpu_register_types(void)
 148 {
 149     type_register_static(&mb_cpu_type_info);
 150 }
 151
 152 type_init(mb_cpu_register_types)