/*
* QEMU S/390 CPU
*
* Copyright (c) 2009 Ulrich Hecht
* Copyright (c) 2011 Alexander Graf
* Copyright (c) 2012 SUSE LINUX Products GmbH
* Copyright (c) 2012 IBM Corp.
*
* 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>
* Contributions after 2012-12-11 are licensed under the terms of the
* GNU GPL, version 2 or (at your option) any later version.
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "cpu.h"
#include "qemu-common.h"
#include "qemu/cutils.h"
#include "qemu/timer.h"
#include "qemu/error-report.h"
#include "trace.h"
#include "qapi/visitor.h"
#include "migration/vmstate.h"
#include "exec/exec-all.h"
#ifndef CONFIG_USER_ONLY
#include "hw/hw.h"
#include "sysemu/arch_init.h"
#include "sysemu/sysemu.h"
#include "hw/s390x/sclp.h"
#endif
#define CR0_RESET 0xE0UL
#define CR14_RESET 0xC2000000UL;
/* generate CPU information for cpu -? */
void s390_cpu_list(FILE *f, fprintf_function cpu_fprintf)
{
#ifdef CONFIG_KVM
(*cpu_fprintf)(f, "s390 %16s\n", "host");
#endif
}
#ifndef CONFIG_USER_ONLY
CpuDefinitionInfoList *arch_query_cpu_definitions(Error **errp)
{
CpuDefinitionInfoList *entry;
CpuDefinitionInfo *info;
info = g_malloc0(sizeof(*info));
info->name = g_strdup("host");
entry = g_malloc0(sizeof(*entry));
entry->value = info;
return entry;
}
#endif
static void s390_cpu_set_pc(CPUState *cs, vaddr value)
{
S390CPU *cpu = S390_CPU(cs);
cpu->env.psw.addr = value;
}
static bool s390_cpu_has_work(CPUState *cs)
{
S390CPU *cpu = S390_CPU(cs);
CPUS390XState *env = &cpu->env;
return (cs->interrupt_request & CPU_INTERRUPT_HARD) &&
(env->psw.mask & PSW_MASK_EXT);
}
#if !defined(CONFIG_USER_ONLY)
/* S390CPUClass::load_normal() */
static void s390_cpu_load_normal(CPUState *s)
{
S390CPU *cpu = S390_CPU(s);
cpu->env.psw.addr = ldl_phys(s->as, 4) & PSW_MASK_ESA_ADDR;
cpu->env.psw.mask = PSW_MASK_32 | PSW_MASK_64;
s390_cpu_set_state(CPU_STATE_OPERATING, cpu);
}
#endif
/* S390CPUClass::cpu_reset() */
static void s390_cpu_reset(CPUState *s)
{
S390CPU *cpu = S390_CPU(s);
S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
CPUS390XState *env = &cpu->env;
env->pfault_token = -1UL;
scc->parent_reset(s);
cpu->env.sigp_order = 0;
s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
tlb_flush(s, 1);
}
/* S390CPUClass::initial_reset() */
static void s390_cpu_initial_reset(CPUState *s)
{
S390CPU *cpu = S390_CPU(s);
CPUS390XState *env = &cpu->env;
int i;
s390_cpu_reset(s);
/* initial reset does not touch regs,fregs and aregs */
memset(&env->fpc, 0, offsetof(CPUS390XState, cpu_num) -
offsetof(CPUS390XState, fpc));
/* architectured initial values for CR 0 and 14 */
env->cregs[0] = CR0_RESET;
env->cregs[14] = CR14_RESET;
/* architectured initial value for Breaking-Event-Address register */
env->gbea = 1;
env->pfault_token = -1UL;
env->ext_index = -1;
for (i = 0; i < ARRAY_SIZE(env->io_index); i++) {
env->io_index[i] = -1;
}
/* tininess for underflow is detected before rounding */
set_float_detect_tininess(float_tininess_before_rounding,
&env->fpu_status);
/* Reset state inside the kernel that we cannot access yet from QEMU. */
if (kvm_enabled()) {
kvm_s390_reset_vcpu(cpu);
}
tlb_flush(s, 1);
}
/* CPUClass:reset() */
static void s390_cpu_full_reset(CPUState *s)
{
S390CPU *cpu = S390_CPU(s);
S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
CPUS390XState *env = &cpu->env;
int i;
scc->parent_reset(s);
cpu->env.sigp_order = 0;
s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
memset(env, 0, offsetof(CPUS390XState, cpu_num));
/* architectured initial values for CR 0 and 14 */
env->cregs[0] = CR0_RESET;
env->cregs[14] = CR14_RESET;
/* architectured initial value for Breaking-Event-Address register */
env->gbea = 1;
env->pfault_token = -1UL;
env->ext_index = -1;
for (i = 0; i < ARRAY_SIZE(env->io_index); i++) {
env->io_index[i] = -1;
}
/* tininess for underflow is detected before rounding */
set_float_detect_tininess(float_tininess_before_rounding,
&env->fpu_status);
/* Reset state inside the kernel that we cannot access yet from QEMU. */
if (kvm_enabled()) {
kvm_s390_reset_vcpu(cpu);
}
tlb_flush(s, 1);
}
#if !defined(CONFIG_USER_ONLY)
static void s390_cpu_machine_reset_cb(void *opaque)
{
S390CPU *cpu = opaque;
run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, CPU(cpu));
}
#endif
static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
{
info->mach = bfd_mach_s390_64;
info->print_insn = print_insn_s390;
}
static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
{
CPUState *cs = CPU(dev);
S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
S390CPU *cpu = S390_CPU(dev);
CPUS390XState *env = &cpu->env;
Error *err = NULL;
#if !defined(CONFIG_USER_ONLY)
if (cpu->id >= max_cpus) {
error_setg(&err, "Unable to add CPU: %" PRIi64
", max allowed: %d", cpu->id, max_cpus - 1);
goto out;
}
#endif
if (cpu_exists(cpu->id)) {
error_setg(&err, "Unable to add CPU: %" PRIi64
", it already exists", cpu->id);
goto out;
}
if (cpu->id != scc->next_cpu_id) {
error_setg(&err, "Unable to add CPU: %" PRIi64
", The next available id is %" PRIi64, cpu->id,
scc->next_cpu_id);
goto out;
}
cpu_exec_init(cs, &err);
if (err != NULL) {
goto out;
}
scc->next_cpu_id++;
#if !defined(CONFIG_USER_ONLY)
qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
#endif
env->cpu_num = cpu->id;
s390_cpu_gdb_init(cs);
qemu_init_vcpu(cs);
#if !defined(CONFIG_USER_ONLY)
run_on_cpu(cs, s390_do_cpu_full_reset, cs);
#else
cpu_reset(cs);
#endif
scc->parent_realize(dev, &err);
#if !defined(CONFIG_USER_ONLY)
if (dev->hotplugged) {
raise_irq_cpu_hotplug();
}
#endif
out:
error_propagate(errp, err);
}
static void s390x_cpu_get_id(Object *obj, Visitor *v, const char *name,
void *opaque, Error **errp)
{
S390CPU *cpu = S390_CPU(obj);
int64_t value = cpu->id;
visit_type_int(v, name, &value, errp);
}
static void s390x_cpu_set_id(Object *obj, Visitor *v, const char *name,
void *opaque, Error **errp)
{
S390CPU *cpu = S390_CPU(obj);
DeviceState *dev = DEVICE(obj);
const int64_t min = 0;
const int64_t max = UINT32_MAX;
Error *err = NULL;
int64_t value;
if (dev->realized) {
error_setg(errp, "Attempt to set property '%s' on '%s' after "
"it was realized", name, object_get_typename(obj));
return;
}
visit_type_int(v, name, &value, &err);
if (err) {
error_propagate(errp, err);
return;
}
if (value < min || value > max) {
error_setg(errp, "Property %s.%s doesn't take value %" PRId64
" (minimum: %" PRId64 ", maximum: %" PRId64 ")" ,
object_get_typename(obj), name, value, min, max);
return;
}
cpu->id = value;
}
static void s390_cpu_initfn(Object *obj)
{
CPUState *cs = CPU(obj);
S390CPU *cpu = S390_CPU(obj);
CPUS390XState *env = &cpu->env;
static bool inited;
#if !defined(CONFIG_USER_ONLY)
struct tm tm;
#endif
cs->env_ptr = env;
cs->halted = 1;
cs->exception_index = EXCP_HLT;
object_property_add(OBJECT(cpu), "id", "int64_t", s390x_cpu_get_id,
s390x_cpu_set_id, NULL, NULL, NULL);
#if !defined(CONFIG_USER_ONLY)
qemu_get_timedate(&tm, 0);
env->tod_offset = TOD_UNIX_EPOCH +
(time2tod(mktimegm(&tm)) * 1000000000ULL);
env->tod_basetime = 0;
env->tod_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
env->cpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
#endif
if (tcg_enabled() && !inited) {
inited = true;
s390x_translate_init();
}
}
static void s390_cpu_finalize(Object *obj)
{
#if !defined(CONFIG_USER_ONLY)
S390CPU *cpu = S390_CPU(obj);
qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
g_free(cpu->irqstate);
#endif
}
#if !defined(CONFIG_USER_ONLY)
static bool disabled_wait(CPUState *cpu)
{
return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
(PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
}
static unsigned s390_count_running_cpus(void)
{
CPUState *cpu;
int nr_running = 0;
CPU_FOREACH(cpu) {
uint8_t state = S390_CPU(cpu)->env.cpu_state;
if (state == CPU_STATE_OPERATING ||
state == CPU_STATE_LOAD) {
if (!disabled_wait(cpu)) {
nr_running++;
}
}
}
return nr_running;
}
unsigned int s390_cpu_halt(S390CPU *cpu)
{
CPUState *cs = CPU(cpu);
trace_cpu_halt(cs->cpu_index);
if (!cs->halted) {
cs->halted = 1;
cs->exception_index = EXCP_HLT;
}
return s390_count_running_cpus();
}
void s390_cpu_unhalt(S390CPU *cpu)
{
CPUState *cs = CPU(cpu);
trace_cpu_unhalt(cs->cpu_index);
if (cs->halted) {
cs->halted = 0;
cs->exception_index = -1;
}
}
unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
{
trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
switch (cpu_state) {
case CPU_STATE_STOPPED:
case CPU_STATE_CHECK_STOP:
/* halt the cpu for common infrastructure */
s390_cpu_halt(cpu);
break;
case CPU_STATE_OPERATING:
case CPU_STATE_LOAD:
/* unhalt the cpu for common infrastructure */
s390_cpu_unhalt(cpu);
break;
default:
error_report("Requested CPU state is not a valid S390 CPU state: %u",
cpu_state);
exit(1);
}
if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
kvm_s390_set_cpu_state(cpu, cpu_state);
}
cpu->env.cpu_state = cpu_state;
return s390_count_running_cpus();
}
#endif
static gchar *s390_gdb_arch_name(CPUState *cs)
{
return g_strdup("s390:64-bit");
}
static void s390_cpu_class_init(ObjectClass *oc, void *data)
{
S390CPUClass *scc = S390_CPU_CLASS(oc);
CPUClass *cc = CPU_CLASS(scc);
DeviceClass *dc = DEVICE_CLASS(oc);
scc->next_cpu_id = 0;
scc->parent_realize = dc->realize;
dc->realize = s390_cpu_realizefn;
scc->parent_reset = cc->reset;
#if !defined(CONFIG_USER_ONLY)
scc->load_normal = s390_cpu_load_normal;
#endif
scc->cpu_reset = s390_cpu_reset;
scc->initial_cpu_reset = s390_cpu_initial_reset;
cc->reset = s390_cpu_full_reset;
cc->has_work = s390_cpu_has_work;
cc->do_interrupt = s390_cpu_do_interrupt;
cc->dump_state = s390_cpu_dump_state;
cc->set_pc = s390_cpu_set_pc;
cc->gdb_read_register = s390_cpu_gdb_read_register;
cc->gdb_write_register = s390_cpu_gdb_write_register;
#ifdef CONFIG_USER_ONLY
cc->handle_mmu_fault = s390_cpu_handle_mmu_fault;
#else
cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
cc->vmsd = &vmstate_s390_cpu;
cc->write_elf64_note = s390_cpu_write_elf64_note;
cc->cpu_exec_interrupt = s390_cpu_exec_interrupt;
cc->debug_excp_handler = s390x_cpu_debug_excp_handler;
#endif
cc->disas_set_info = s390_cpu_disas_set_info;
cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
cc->gdb_core_xml_file = "s390x-core64.xml";
cc->gdb_arch_name = s390_gdb_arch_name;
/*
* Reason: s390_cpu_realizefn() calls cpu_exec_init(), which saves
* the object in cpus -> dangling pointer after final
* object_unref().
*/
dc->cannot_destroy_with_object_finalize_yet = true;
}
static const TypeInfo s390_cpu_type_info = {
.name = TYPE_S390_CPU,
.parent = TYPE_CPU,
.instance_size = sizeof(S390CPU),
.instance_init = s390_cpu_initfn,
.instance_finalize = s390_cpu_finalize,
.abstract = false,
.class_size = sizeof(S390CPUClass),
.class_init = s390_cpu_class_init,
};
static void s390_cpu_register_types(void)
{
type_register_static(&s390_cpu_type_info);
}
type_init(s390_cpu_register_types)
