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/*
* QEMU Nios II CPU
*
* Copyright (c) 2012 Chris Wulff <crwulff@gmail.com>
*
* 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
* <http://www.gnu.org/licenses/lgpl-2.1.html>
*/
#include "qemu/osdep.h"
#include "qemu-common.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)
{
CPUState *cs = CPU(obj);
Nios2CPU *cpu = NIOS2_CPU(obj);
CPUNios2State *env = &cpu->env;
static bool tcg_initialized;
cs->env_ptr = env;
#if !defined(CONFIG_USER_ONLY)
mmu_init(env);
#endif
if (tcg_enabled() && !tcg_initialized) {
tcg_initialized = true;
nios2_tcg_init();
}
}
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);
ncc->parent_realize = dc->realize;
dc->realize = nios2_cpu_realizefn;
dc->props = nios2_properties;
ncc->parent_reset = cc->reset;
cc->reset = nios2_cpu_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;
#ifdef CONFIG_USER_ONLY
cc->handle_mmu_fault = nios2_cpu_handle_mmu_fault;
#else
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;
}
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)
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