unicorn/qemu/hw/arm/virt.c
Igor Mammedov 7fe1504224
arm: drop intermediate cpu_model -> cpu type parsing and use cpu type directly
there are 2 use cases to deal with:
1: fixed CPU models per board/soc
2: boards with user configurable cpu_model and fallback to
default cpu_model if user hasn't specified one explicitly

For the 1st
drop intermediate cpu_model parsing and use const cpu type
directly, which replaces:
typename = object_class_get_name(
cpu_class_by_name(TYPE_ARM_CPU, cpu_model))
object_new(typename)
with
object_new(FOO_CPU_TYPE_NAME)
or
cpu_generic_init(BASE_CPU_TYPE, "my cpu model")
with
cpu_create(FOO_CPU_TYPE_NAME)

as result 1st use case doesn't have to invoke not necessary
translation and not needed code is removed.

For the 2nd
1: set default cpu type with MachineClass::default_cpu_type and
2: use generic cpu_model parsing that done before machine_init()
is run and:
2.1: drop custom cpu_model parsing where pattern is:
typename = object_class_get_name(
cpu_class_by_name(TYPE_ARM_CPU, cpu_model))
[parse_features(typename, cpu_model, &err) ]

2.2: or replace cpu_generic_init() which does what
2.1 does + create_cpu(typename) with just
create_cpu(machine->cpu_type)
as result cpu_name -> cpu_type translation is done using
generic machine code one including parsing optional features
if supported/present (removes a bunch of duplicated cpu_model
parsing code) and default cpu type is defined in an uniform way
within machine_class_init callbacks instead of adhoc places
in boadr's machine_init code.

Backports commit ba1ba5cca3962a9cc400c713c736b4fb8db1f38e from qemu
2018-03-20 13:35:33 -04:00

165 lines
4.8 KiB
C

/*
* ARM mach-virt emulation
*
* Copyright (c) 2013 Linaro Limited
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2 or later, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*
* Emulate a virtual board which works by passing Linux all the information
* it needs about what devices are present via the device tree.
* There are some restrictions about what we can do here:
* + we can only present devices whose Linux drivers will work based
* purely on the device tree with no platform data at all
* + we want to present a very stripped-down minimalist platform,
* both because this reduces the security attack surface from the guest
* and also because it reduces our exposure to being broken when
* the kernel updates its device tree bindings and requires further
* information in a device binding that we aren't providing.
* This is essentially the same approach kvmtool uses.
*/
/* Unicorn Emulator Engine */
/* By Nguyen Anh Quynh, 2015 */
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu-common.h"
#include "cpu.h"
#include "hw/arm/arm.h"
#include "hw/boards.h"
#include "exec/address-spaces.h"
// Unicorn: Daughterboard member removed, as it's not necessary
// for Unicorn's purposes.
typedef struct {
MachineClass parent;
} VirtMachineClass;
typedef struct {
MachineState parent;
bool secure;
} VirtMachineState;
#define TYPE_VIRT_MACHINE MACHINE_TYPE_NAME("virt")
#define VIRT_MACHINE(uc, obj) \
OBJECT_CHECK((uc), VirtMachineState, (obj), TYPE_VIRT_MACHINE)
#define VIRT_MACHINE_GET_CLASS(uc, obj) \
OBJECT_GET_CLASS(uc, VirtMachineClass, obj, TYPE_VIRT_MACHINE)
#define VIRT_MACHINE_CLASS(uc, klass) \
OBJECT_CLASS_CHECK(uc, VirtMachineClass, klass, TYPE_VIRT_MACHINE)
static const char *valid_cpus[] = {
ARM_CPU_TYPE_NAME("cortex-a15"),
ARM_CPU_TYPE_NAME("cortex-a53"),
ARM_CPU_TYPE_NAME("cortex-a57"),
ARM_CPU_TYPE_NAME("host"),
// Unicorn: added to allow enabling all CPU features
ARM_CPU_TYPE_NAME("max"),
};
static bool cpu_type_valid(const char *cpu)
{
int i;
for (i = 0; i < ARRAY_SIZE(valid_cpus); i++) {
if (strcmp(cpu, valid_cpus[i]) == 0) {
return true;
}
}
return false;
}
static int machvirt_init(struct uc_struct *uc, MachineState *machine)
{
int n;
if (!cpu_type_valid(machine->cpu_type)) {
fprintf(stderr, "mach-virt: CPU type %s not supported", machine->cpu_type);
return -1;
}
for (n = 0; n < smp_cpus; n++) {
Object *cpuobj = object_new(uc, machine->cpu_type);
uc->cpu = CPU(cpuobj);
object_property_set_bool(uc, cpuobj, true, "realized", NULL);
}
return 0;
}
static QEMU_UNUSED_FUNC bool virt_get_secure(struct uc_struct *uc, Object *obj, Error **errp)
{
VirtMachineState *vms = VIRT_MACHINE(uc, obj);
return vms->secure;
}
static QEMU_UNUSED_FUNC int virt_set_secure(struct uc_struct *uc, Object *obj, bool value, Error **errp)
{
VirtMachineState *vms = VIRT_MACHINE(uc, obj);
vms->secure = value;
return 0;
}
static void virt_instance_init(struct uc_struct *uc, Object *obj, void *opaque)
{
VirtMachineState *vms = VIRT_MACHINE(uc, obj);
/* EL3 is enabled by default on virt */
vms->secure = true;
/* Unicorn: should be uncommented, but causes linkage errors :/
object_property_add_bool(uc, obj, "secure", virt_get_secure,
virt_set_secure, NULL);
object_property_set_description(uc, obj, "secure",
"Set on/off to enable/disable the ARM "
"Security Extensions (TrustZone)",
NULL);
*/
}
static void virt_class_init(struct uc_struct *uc, ObjectClass *oc, void *data)
{
MachineClass *mc = MACHINE_CLASS(uc, oc);
mc->init = machvirt_init;
mc->max_cpus = 8;
mc->is_default = 1;
mc->arch = UC_ARCH_ARM64;
// Unicorn: Enable all CPU features
mc->default_cpu_type = ARM_CPU_TYPE_NAME("max");
}
static const TypeInfo machvirt_info = {
TYPE_VIRT_MACHINE,
TYPE_MACHINE,
sizeof(VirtMachineClass),
sizeof(VirtMachineState),
NULL,
virt_instance_init,
NULL,
NULL,
NULL,
virt_class_init,
};
void machvirt_machine_init(struct uc_struct *uc)
{
type_register_static(uc, &machvirt_info);
}