unicorn/qemu/target-mips/cpu.c
2017-01-23 12:39:34 +08:00

171 lines
4.4 KiB
C

/*
* QEMU MIPS CPU
*
* Copyright (c) 2012 SUSE LINUX Products GmbH
*
* 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 "cpu.h"
#include "qemu-common.h"
#include "hw/mips/mips.h"
static void mips_cpu_set_pc(CPUState *cs, vaddr value)
{
MIPSCPU *cpu = MIPS_CPU(cs->uc, cs);
CPUMIPSState *env = &cpu->env;
env->active_tc.PC = value & ~(target_ulong)1;
if (value & 1) {
env->hflags |= MIPS_HFLAG_M16;
} else {
env->hflags &= ~(MIPS_HFLAG_M16);
}
}
static void mips_cpu_synchronize_from_tb(CPUState *cs, TranslationBlock *tb)
{
MIPSCPU *cpu = MIPS_CPU(cs->uc, cs);
CPUMIPSState *env = &cpu->env;
env->active_tc.PC = tb->pc;
env->hflags &= ~MIPS_HFLAG_BMASK;
env->hflags |= tb->flags & MIPS_HFLAG_BMASK;
}
static bool mips_cpu_has_work(CPUState *cs)
{
MIPSCPU *cpu = MIPS_CPU(cs->uc, cs);
CPUMIPSState *env = &cpu->env;
bool has_work = false;
/* It is implementation dependent if non-enabled interrupts
wake-up the CPU, however most of the implementations only
check for interrupts that can be taken. */
if ((cs->interrupt_request & CPU_INTERRUPT_HARD) &&
cpu_mips_hw_interrupts_pending(env)) {
has_work = true;
}
/* MIPS-MT has the ability to halt the CPU. */
if (env->CP0_Config3 & (1 << CP0C3_MT)) {
/* The QEMU model will issue an _WAKE request whenever the CPUs
should be woken up. */
if (cs->interrupt_request & CPU_INTERRUPT_WAKE) {
has_work = true;
}
if (!mips_vpe_active(env)) {
has_work = false;
}
}
return has_work;
}
/* CPUClass::reset() */
static void mips_cpu_reset(CPUState *s)
{
MIPSCPU *cpu = MIPS_CPU(s->uc, s);
MIPSCPUClass *mcc = MIPS_CPU_GET_CLASS(s->uc, cpu);
CPUMIPSState *env = &cpu->env;
mcc->parent_reset(s);
memset(env, 0, offsetof(CPUMIPSState, mvp));
tlb_flush(s, 1);
cpu_state_reset(env);
}
static int mips_cpu_realizefn(struct uc_struct *uc, DeviceState *dev, Error **errp)
{
CPUState *cs = CPU(dev);
MIPSCPUClass *mcc = MIPS_CPU_GET_CLASS(uc, dev);
cpu_reset(cs);
qemu_init_vcpu(cs);
mcc->parent_realize(uc, dev, errp);
return 0;
}
static void mips_cpu_initfn(struct uc_struct *uc, Object *obj, void *opaque)
{
CPUState *cs = CPU(obj);
MIPSCPU *cpu = MIPS_CPU(uc, obj);
CPUMIPSState *env = &cpu->env;
cs->env_ptr = env;
cpu_exec_init(env, opaque);
if (tcg_enabled(uc)) {
mips_tcg_init(uc);
}
}
static void mips_cpu_class_init(struct uc_struct *uc, ObjectClass *c, void *data)
{
MIPSCPUClass *mcc = MIPS_CPU_CLASS(uc, c);
CPUClass *cc = CPU_CLASS(uc, c);
DeviceClass *dc = DEVICE_CLASS(uc, c);
mcc->parent_realize = dc->realize;
dc->realize = mips_cpu_realizefn;
mcc->parent_reset = cc->reset;
cc->reset = mips_cpu_reset;
cc->has_work = mips_cpu_has_work;
cc->do_interrupt = mips_cpu_do_interrupt;
cc->cpu_exec_interrupt = mips_cpu_exec_interrupt;
cc->set_pc = mips_cpu_set_pc;
cc->synchronize_from_tb = mips_cpu_synchronize_from_tb;
#ifdef CONFIG_USER_ONLY
cc->handle_mmu_fault = mips_cpu_handle_mmu_fault;
#else
cc->do_unassigned_access = mips_cpu_unassigned_access;
cc->do_unaligned_access = mips_cpu_do_unaligned_access;
cc->get_phys_page_debug = mips_cpu_get_phys_page_debug;
#endif
}
void mips_cpu_register_types(void *opaque)
{
const TypeInfo mips_cpu_type_info = {
TYPE_MIPS_CPU,
TYPE_CPU,
sizeof(MIPSCPUClass),
sizeof(MIPSCPU),
opaque,
mips_cpu_initfn,
NULL,
NULL,
NULL,
mips_cpu_class_init,
NULL,
NULL,
false,
};
type_register_static(opaque, &mips_cpu_type_info);
}