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  * Copyright (c) 2009 Edgar E. Iglesias, Axis Communications AB.
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, see
  21  * <http://www.gnu.org/licenses/lgpl-2.1.html>
  22  */
  23
  24 #include "qemu/osdep.h"
  25 #include "qapi/error.h"
  26 #include "cpu.h"
  27 #include "qemu-common.h"
  28 #include "hw/qdev-properties.h"
  29 #include "migration/vmstate.h"
  30 #include "exec/exec-all.h"
  31
  32 static const struct {
  33     const char *name;
  34     uint8_t version_id;
  35 } mb_cpu_lookup[] = {
  36     /* These key value are as per MBV field in PVR0 */
  37     {"5.00.a", 0x01},
  38     {"5.00.b", 0x02},
  39     {"5.00.c", 0x03},
  40     {"6.00.a", 0x04},
  41     {"6.00.b", 0x06},
  42     {"7.00.a", 0x05},
  43     {"7.00.b", 0x07},
  44     {"7.10.a", 0x08},
  45     {"7.10.b", 0x09},
  46     {"7.10.c", 0x0a},
  47     {"7.10.d", 0x0b},
  48     {"7.20.a", 0x0c},
  49     {"7.20.b", 0x0d},
  50     {"7.20.c", 0x0e},
  51     {"7.20.d", 0x0f},
  52     {"7.30.a", 0x10},
  53     {"7.30.b", 0x11},
  54     {"8.00.a", 0x12},
  55     {"8.00.b", 0x13},
  56     {"8.10.a", 0x14},
  57     {"8.20.a", 0x15},
  58     {"8.20.b", 0x16},
  59     {"8.30.a", 0x17},
  60     {"8.40.a", 0x18},
  61     {"8.40.b", 0x19},
  62     {"8.50.a", 0x1A},
  63     {"9.0", 0x1B},
  64     {"9.1", 0x1D},
  65     {"9.2", 0x1F},
  66     {"9.3", 0x20},
  67     {NULL, 0},
  68 };
  69
  70 static void mb_cpu_set_pc(CPUState *cs, vaddr value)
  71 {
  72     MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
  73
  74     cpu->env.sregs[SR_PC] = value;
  75 }
  76
  77 static bool mb_cpu_has_work(CPUState *cs)
  78 {
  79     return cs->interrupt_request & (CPU_INTERRUPT_HARD | CPU_INTERRUPT_NMI);
  80 }
  81
  82 #ifndef CONFIG_USER_ONLY
  83 static void microblaze_cpu_set_irq(void *opaque, int irq, int level)
  84 {
  85     MicroBlazeCPU *cpu = opaque;
  86     CPUState *cs = CPU(cpu);
  87     int type = irq ? CPU_INTERRUPT_NMI : CPU_INTERRUPT_HARD;
  88
  89     if (level) {
  90         cpu_interrupt(cs, type);
  91     } else {
  92         cpu_reset_interrupt(cs, type);
  93     }
  94 }
  95 #endif
  96
  97 /* CPUClass::reset() */
  98 static void mb_cpu_reset(CPUState *s)
  99 {
 100     MicroBlazeCPU *cpu = MICROBLAZE_CPU(s);
 101     MicroBlazeCPUClass *mcc = MICROBLAZE_CPU_GET_CLASS(cpu);
 102     CPUMBState *env = &cpu->env;
 103
 104     mcc->parent_reset(s);
 105
 106     memset(env, 0, offsetof(CPUMBState, pvr));
 107     env->res_addr = RES_ADDR_NONE;
 108     tlb_flush(s, 1);
 109
 110     /* Disable stack protector.  */
 111     env->shr = ~0;
 112
 113     env->sregs[SR_PC] = cpu->cfg.base_vectors;
 114
 115 #if defined(CONFIG_USER_ONLY)
 116     /* start in user mode with interrupts enabled.  */
 117     env->sregs[SR_MSR] = MSR_EE | MSR_IE | MSR_VM | MSR_UM;
 118 #else
 119     env->sregs[SR_MSR] = 0;
 120     mmu_init(&env->mmu);
 121     env->mmu.c_mmu = 3;
 122     env->mmu.c_mmu_tlb_access = 3;
 123     env->mmu.c_mmu_zones = 16;
 124 #endif
 125 }
 126
 127 static void mb_disas_set_info(CPUState *cpu, disassemble_info *info)
 128 {
 129     info->mach = bfd_arch_microblaze;
 130     info->print_insn = print_insn_microblaze;
 131 }
 132
 133 static void mb_cpu_realizefn(DeviceState *dev, Error **errp)
 134 {
 135     CPUState *cs = CPU(dev);
 136     MicroBlazeCPUClass *mcc = MICROBLAZE_CPU_GET_CLASS(dev);
 137     MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
 138     CPUMBState *env = &cpu->env;
 139     uint8_t version_code = 0;
 140     int i = 0;
 141
 142     qemu_init_vcpu(cs);
 143
 144     env->pvr.regs[0] = PVR0_USE_BARREL_MASK \
 145                        | PVR0_USE_DIV_MASK \
 146                        | PVR0_USE_HW_MUL_MASK \
 147                        | PVR0_USE_EXC_MASK \
 148                        | PVR0_USE_ICACHE_MASK \
 149                        | PVR0_USE_DCACHE_MASK \
 150                        | (0xb << 8);
 151     env->pvr.regs[2] = PVR2_D_OPB_MASK \
 152                         | PVR2_D_LMB_MASK \
 153                         | PVR2_I_OPB_MASK \
 154                         | PVR2_I_LMB_MASK \
 155                         | PVR2_USE_MSR_INSTR \
 156                         | PVR2_USE_PCMP_INSTR \
 157                         | PVR2_USE_BARREL_MASK \
 158                         | PVR2_USE_DIV_MASK \
 159                         | PVR2_USE_HW_MUL_MASK \
 160                         | PVR2_USE_MUL64_MASK \
 161                         | PVR2_FPU_EXC_MASK \
 162                         | 0;
 163
 164     for (i = 0; mb_cpu_lookup[i].name && cpu->cfg.version; i++) {
 165         if (strcmp(mb_cpu_lookup[i].name, cpu->cfg.version) == 0) {
 166             version_code = mb_cpu_lookup[i].version_id;
 167             break;
 168         }
 169     }
 170
 171     if (!version_code) {
 172         qemu_log("Invalid MicroBlaze version number: %s\n", cpu->cfg.version);
 173     }
 174
 175     env->pvr.regs[0] |= (cpu->cfg.stackprot ? PVR0_SPROT_MASK : 0) |
 176                         (cpu->cfg.use_fpu ? PVR0_USE_FPU_MASK : 0) |
 177                         (cpu->cfg.use_mmu ? PVR0_USE_MMU_MASK : 0) |
 178                         (cpu->cfg.endi ? PVR0_ENDI_MASK : 0) |
 179                         (version_code << 16) |
 180                         (cpu->cfg.pvr == C_PVR_FULL ? PVR0_PVR_FULL_MASK : 0);
 181
 182     env->pvr.regs[2] |= (cpu->cfg.use_fpu ? PVR2_USE_FPU_MASK : 0) |
 183                         (cpu->cfg.use_fpu > 1 ? PVR2_USE_FPU2_MASK : 0);
 184
 185     env->pvr.regs[5] |= cpu->cfg.dcache_writeback ?
 186                                         PVR5_DCACHE_WRITEBACK_MASK : 0;
 187
 188     env->pvr.regs[10] = 0x0c000000; /* Default to spartan 3a dsp family.  */
 189     env->pvr.regs[11] = PVR11_USE_MMU | (16 << 17);
 190
 191     mcc->parent_realize(dev, errp);
 192 }
 193
 194 static void mb_cpu_initfn(Object *obj)
 195 {
 196     CPUState *cs = CPU(obj);
 197     MicroBlazeCPU *cpu = MICROBLAZE_CPU(obj);
 198     CPUMBState *env = &cpu->env;
 199     static bool tcg_initialized;
 200
 201     cs->env_ptr = env;
 202     cpu_exec_init(cs, &error_abort);
 203
 204     set_float_rounding_mode(float_round_nearest_even, &env->fp_status);
 205
 206 #ifndef CONFIG_USER_ONLY
 207     /* Inbound IRQ and FIR lines */
 208     qdev_init_gpio_in(DEVICE(cpu), microblaze_cpu_set_irq, 2);
 209 #endif
 210
 211     if (tcg_enabled() && !tcg_initialized) {
 212         tcg_initialized = true;
 213         mb_tcg_init();
 214     }
 215 }
 216
 217 static const VMStateDescription vmstate_mb_cpu = {
 218     .name = "cpu",
 219     .unmigratable = 1,
 220 };
 221
 222 static Property mb_properties[] = {
 223     DEFINE_PROP_UINT32("base-vectors", MicroBlazeCPU, cfg.base_vectors, 0),
 224     DEFINE_PROP_BOOL("use-stack-protection", MicroBlazeCPU, cfg.stackprot,
 225                      false),
 226     /* If use-fpu > 0 - FPU is enabled
 227      * If use-fpu = 2 - Floating point conversion and square root instructions
 228      *                  are enabled
 229      */
 230     DEFINE_PROP_UINT8("use-fpu", MicroBlazeCPU, cfg.use_fpu, 2),
 231     DEFINE_PROP_BOOL("use-mmu", MicroBlazeCPU, cfg.use_mmu, true),
 232     DEFINE_PROP_BOOL("dcache-writeback", MicroBlazeCPU, cfg.dcache_writeback,
 233                      false),
 234     DEFINE_PROP_BOOL("endianness", MicroBlazeCPU, cfg.endi, false),
 235     DEFINE_PROP_STRING("version", MicroBlazeCPU, cfg.version),
 236     DEFINE_PROP_UINT8("pvr", MicroBlazeCPU, cfg.pvr, C_PVR_FULL),
 237     DEFINE_PROP_END_OF_LIST(),
 238 };
 239
 240 static void mb_cpu_class_init(ObjectClass *oc, void *data)
 241 {
 242     DeviceClass *dc = DEVICE_CLASS(oc);
 243     CPUClass *cc = CPU_CLASS(oc);
 244     MicroBlazeCPUClass *mcc = MICROBLAZE_CPU_CLASS(oc);
 245
 246     mcc->parent_realize = dc->realize;
 247     dc->realize = mb_cpu_realizefn;
 248
 249     mcc->parent_reset = cc->reset;
 250     cc->reset = mb_cpu_reset;
 251
 252     cc->has_work = mb_cpu_has_work;
 253     cc->do_interrupt = mb_cpu_do_interrupt;
 254     cc->cpu_exec_interrupt = mb_cpu_exec_interrupt;
 255     cc->dump_state = mb_cpu_dump_state;
 256     cc->set_pc = mb_cpu_set_pc;
 257     cc->gdb_read_register = mb_cpu_gdb_read_register;
 258     cc->gdb_write_register = mb_cpu_gdb_write_register;
 259 #ifdef CONFIG_USER_ONLY
 260     cc->handle_mmu_fault = mb_cpu_handle_mmu_fault;
 261 #else
 262     cc->do_unassigned_access = mb_cpu_unassigned_access;
 263     cc->get_phys_page_debug = mb_cpu_get_phys_page_debug;
 264 #endif
 265     dc->vmsd = &vmstate_mb_cpu;
 266     dc->props = mb_properties;
 267     cc->gdb_num_core_regs = 32 + 5;
 268
 269     cc->disas_set_info = mb_disas_set_info;
 270
 271     /*
 272      * Reason: mb_cpu_initfn() calls cpu_exec_init(), which saves the
 273      * object in cpus -> dangling pointer after final object_unref().
 274      */
 275     dc->cannot_destroy_with_object_finalize_yet = true;
 276 }
 277
 278 static const TypeInfo mb_cpu_type_info = {
 279     .name = TYPE_MICROBLAZE_CPU,
 280     .parent = TYPE_CPU,
 281     .instance_size = sizeof(MicroBlazeCPU),
 282     .instance_init = mb_cpu_initfn,
 283     .class_size = sizeof(MicroBlazeCPUClass),
 284     .class_init = mb_cpu_class_init,
 285 };
 286
 287 static void mb_cpu_register_types(void)
 288 {
 289     type_register_static(&mb_cpu_type_info);
 290 }
 291
 292 type_init(mb_cpu_register_types)