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/*
* ARM SSE-200 CPU_IDENTITY register block
*
* Copyright (c) 2019 Linaro Limited
* Written by Peter Maydell
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 or
* (at your option) any later version.
*/
/*
* This is a model of the "CPU_IDENTITY" register block which is part of the
* Arm SSE-200 and documented in
* https://developer.arm.com/documentation/101104/latest/
*
* It consists of one read-only CPUID register (set by QOM property), plus the
* usual ID registers.
*/
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "qemu/module.h"
#include "trace.h"
#include "qapi/error.h"
#include "hw/sysbus.h"
#include "hw/registerfields.h"
#include "hw/misc/armsse-cpuid.h"
#include "hw/qdev-properties.h"
REG32(CPUID, 0x0)
REG32(PID4, 0xfd0)
REG32(PID5, 0xfd4)
REG32(PID6, 0xfd8)
REG32(PID7, 0xfdc)
REG32(PID0, 0xfe0)
REG32(PID1, 0xfe4)
REG32(PID2, 0xfe8)
REG32(PID3, 0xfec)
REG32(CID0, 0xff0)
REG32(CID1, 0xff4)
REG32(CID2, 0xff8)
REG32(CID3, 0xffc)
/* PID/CID values */
static const int sysinfo_id[] = {
0x04, 0x00, 0x00, 0x00, /* PID4..PID7 */
0x58, 0xb8, 0x0b, 0x00, /* PID0..PID3 */
0x0d, 0xf0, 0x05, 0xb1, /* CID0..CID3 */
};
static uint64_t armsse_cpuid_read(void *opaque, hwaddr offset,
unsigned size)
{
ARMSSECPUID *s = ARMSSE_CPUID(opaque);
uint64_t r;
switch (offset) {
case A_CPUID:
r = s->cpuid;
break;
case A_PID4 ... A_CID3:
r = sysinfo_id[(offset - A_PID4) / 4];
break;
default:
qemu_log_mask(LOG_GUEST_ERROR,
"SSE CPU_IDENTITY read: bad offset 0x%x\n", (int)offset);
r = 0;
break;
}
trace_armsse_cpuid_read(offset, r, size);
return r;
}
static void armsse_cpuid_write(void *opaque, hwaddr offset,
uint64_t value, unsigned size)
{
trace_armsse_cpuid_write(offset, value, size);
qemu_log_mask(LOG_GUEST_ERROR,
"SSE CPU_IDENTITY: write to RO offset 0x%x\n", (int)offset);
}
static const MemoryRegionOps armsse_cpuid_ops = {
.read = armsse_cpuid_read,
.write = armsse_cpuid_write,
.endianness = DEVICE_LITTLE_ENDIAN,
/* byte/halfword accesses are just zero-padded on reads and writes */
.impl.min_access_size = 4,
.impl.max_access_size = 4,
.valid.min_access_size = 1,
.valid.max_access_size = 4,
};
static Property armsse_cpuid_props[] = {
DEFINE_PROP_UINT32("CPUID", ARMSSECPUID, cpuid, 0),
DEFINE_PROP_END_OF_LIST()
};
static void armsse_cpuid_init(Object *obj)
{
SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
ARMSSECPUID *s = ARMSSE_CPUID(obj);
memory_region_init_io(&s->iomem, obj, &armsse_cpuid_ops,
s, "armsse-cpuid", 0x1000);
sysbus_init_mmio(sbd, &s->iomem);
}
static void armsse_cpuid_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
/*
* This device has no guest-modifiable state and so it
* does not need a reset function or VMState.
*/
device_class_set_props(dc, armsse_cpuid_props);
}
static const TypeInfo armsse_cpuid_info = {
.name = TYPE_ARMSSE_CPUID,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(ARMSSECPUID),
.instance_init = armsse_cpuid_init,
.class_init = armsse_cpuid_class_init,
};
static void armsse_cpuid_register_types(void)
{
type_register_static(&armsse_cpuid_info);
}
type_init(armsse_cpuid_register_types);
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