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
  26
  27 /* CPUClass::reset() */
  28 static void mb_cpu_reset(CPUState *s)
  29 {
  30     MicroBlazeCPU *cpu = MICROBLAZE_CPU(s);
  31     MicroBlazeCPUClass *mcc = MICROBLAZE_CPU_GET_CLASS(cpu);
  32     CPUMBState *env = &cpu->env;
  33
  34     if (qemu_loglevel_mask(CPU_LOG_RESET)) {
  35         qemu_log("CPU Reset (CPU %d)\n", s->cpu_index);
  36         log_cpu_state(env, 0);
  37     }
  38
  39     mcc->parent_reset(s);
  40
  41     memset(env, 0, offsetof(CPUMBState, breakpoints));
  42     env->res_addr = RES_ADDR_NONE;
  43     tlb_flush(env, 1);
  44
  45     /* Disable stack protector.  */
  46     env->shr = ~0;
  47
  48     env->pvr.regs[0] = PVR0_PVR_FULL_MASK \
  49                        | PVR0_USE_BARREL_MASK \
  50                        | PVR0_USE_DIV_MASK \
  51                        | PVR0_USE_HW_MUL_MASK \
  52                        | PVR0_USE_EXC_MASK \
  53                        | PVR0_USE_ICACHE_MASK \
  54                        | PVR0_USE_DCACHE_MASK \
  55                        | PVR0_USE_MMU \
  56                        | (0xb << 8);
  57     env->pvr.regs[2] = PVR2_D_OPB_MASK \
  58                         | PVR2_D_LMB_MASK \
  59                         | PVR2_I_OPB_MASK \
  60                         | PVR2_I_LMB_MASK \
  61                         | PVR2_USE_MSR_INSTR \
  62                         | PVR2_USE_PCMP_INSTR \
  63                         | PVR2_USE_BARREL_MASK \
  64                         | PVR2_USE_DIV_MASK \
  65                         | PVR2_USE_HW_MUL_MASK \
  66                         | PVR2_USE_MUL64_MASK \
  67                         | PVR2_USE_FPU_MASK \
  68                         | PVR2_USE_FPU2_MASK \
  69                         | PVR2_FPU_EXC_MASK \
  70                         | 0;
  71     env->pvr.regs[10] = 0x0c000000; /* Default to spartan 3a dsp family.  */
  72     env->pvr.regs[11] = PVR11_USE_MMU | (16 << 17);
  73
  74 #if defined(CONFIG_USER_ONLY)
  75     /* start in user mode with interrupts enabled.  */
  76     env->sregs[SR_MSR] = MSR_EE | MSR_IE | MSR_VM | MSR_UM;
  77     env->pvr.regs[10] = 0x0c000000; /* Spartan 3a dsp.  */
  78 #else
  79     env->sregs[SR_MSR] = 0;
  80     mmu_init(&env->mmu);
  81     env->mmu.c_mmu = 3;
  82     env->mmu.c_mmu_tlb_access = 3;
  83     env->mmu.c_mmu_zones = 16;
  84 #endif
  85 }
  86
  87 static void mb_cpu_initfn(Object *obj)
  88 {
  89     MicroBlazeCPU *cpu = MICROBLAZE_CPU(obj);
  90     CPUMBState *env = &cpu->env;
  91
  92     cpu_exec_init(env);
  93
  94     set_float_rounding_mode(float_round_nearest_even, &env->fp_status);
  95 }
  96
  97 static void mb_cpu_class_init(ObjectClass *oc, void *data)
  98 {
  99     CPUClass *cc = CPU_CLASS(oc);
 100     MicroBlazeCPUClass *mcc = MICROBLAZE_CPU_CLASS(oc);
 101
 102     mcc->parent_reset = cc->reset;
 103     cc->reset = mb_cpu_reset;
 104 }
 105
 106 static const TypeInfo mb_cpu_type_info = {
 107     .name = TYPE_MICROBLAZE_CPU,
 108     .parent = TYPE_CPU,
 109     .instance_size = sizeof(MicroBlazeCPU),
 110     .instance_init = mb_cpu_initfn,
 111     .class_size = sizeof(MicroBlazeCPUClass),
 112     .class_init = mb_cpu_class_init,
 113 };
 114
 115 static void mb_cpu_register_types(void)
 116 {
 117     type_register_static(&mb_cpu_type_info);
 118 }
 119
 120 type_init(mb_cpu_register_types)