LXR qemu/hw/misc/armsse-cpuid.c

   1/*
   2 * ARM SSE-200 CPU_IDENTITY register block
   3 *
   4 * Copyright (c) 2019 Linaro Limited
   5 * Written by Peter Maydell
   6 *
   7 *  This program is free software; you can redistribute it and/or modify
   8 *  it under the terms of the GNU General Public License version 2 or
   9 *  (at your option) any later version.
  10 */
  11
  12/*
  13 * This is a model of the "CPU_IDENTITY" register block which is part of the
  14 * Arm SSE-200 and documented in
  15 * http://infocenter.arm.com/help/topic/com.arm.doc.101104_0100_00_en/corelink_sse200_subsystem_for_embedded_technical_reference_manual_101104_0100_00_en.pdf
  16 *
  17 * It consists of one read-only CPUID register (set by QOM property), plus the
  18 * usual ID registers.
  19 */
  20
  21#include "qemu/osdep.h"
  22#include "qemu/log.h"
  23#include "qemu/module.h"
  24#include "trace.h"
  25#include "qapi/error.h"
  26#include "sysemu/sysemu.h"
  27#include "hw/sysbus.h"
  28#include "hw/registerfields.h"
  29#include "hw/misc/armsse-cpuid.h"
  30
  31REG32(CPUID, 0x0)
  32REG32(PID4, 0xfd0)
  33REG32(PID5, 0xfd4)
  34REG32(PID6, 0xfd8)
  35REG32(PID7, 0xfdc)
  36REG32(PID0, 0xfe0)
  37REG32(PID1, 0xfe4)
  38REG32(PID2, 0xfe8)
  39REG32(PID3, 0xfec)
  40REG32(CID0, 0xff0)
  41REG32(CID1, 0xff4)
  42REG32(CID2, 0xff8)
  43REG32(CID3, 0xffc)
  44
  45/* PID/CID values */
  46static const int sysinfo_id[] = {
  47    0x04, 0x00, 0x00, 0x00, /* PID4..PID7 */
  48    0x58, 0xb8, 0x0b, 0x00, /* PID0..PID3 */
  49    0x0d, 0xf0, 0x05, 0xb1, /* CID0..CID3 */
  50};
  51
  52static uint64_t armsse_cpuid_read(void *opaque, hwaddr offset,
  53                                    unsigned size)
  54{
  55    ARMSSECPUID *s = ARMSSE_CPUID(opaque);
  56    uint64_t r;
  57
  58    switch (offset) {
  59    case A_CPUID:
  60        r = s->cpuid;
  61        break;
  62    case A_PID4 ... A_CID3:
  63        r = sysinfo_id[(offset - A_PID4) / 4];
  64        break;
  65    default:
  66        qemu_log_mask(LOG_GUEST_ERROR,
  67                      "SSE CPU_IDENTITY read: bad offset 0x%x\n", (int)offset);
  68        r = 0;
  69        break;
  70    }
  71    trace_armsse_cpuid_read(offset, r, size);
  72    return r;
  73}
  74
  75static void armsse_cpuid_write(void *opaque, hwaddr offset,
  76                                 uint64_t value, unsigned size)
  77{
  78    trace_armsse_cpuid_write(offset, value, size);
  79
  80    qemu_log_mask(LOG_GUEST_ERROR,
  81                  "SSE CPU_IDENTITY: write to RO offset 0x%x\n", (int)offset);
  82}
  83
  84static const MemoryRegionOps armsse_cpuid_ops = {
  85    .read = armsse_cpuid_read,
  86    .write = armsse_cpuid_write,
  87    .endianness = DEVICE_LITTLE_ENDIAN,
  88    /* byte/halfword accesses are just zero-padded on reads and writes */
  89    .impl.min_access_size = 4,
  90    .impl.max_access_size = 4,
  91    .valid.min_access_size = 1,
  92    .valid.max_access_size = 4,
  93};
  94
  95static Property armsse_cpuid_props[] = {
  96    DEFINE_PROP_UINT32("CPUID", ARMSSECPUID, cpuid, 0),
  97    DEFINE_PROP_END_OF_LIST()
  98};
  99
 100static void armsse_cpuid_init(Object *obj)
 101{
 102    SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
 103    ARMSSECPUID *s = ARMSSE_CPUID(obj);
 104
 105    memory_region_init_io(&s->iomem, obj, &armsse_cpuid_ops,
 106                          s, "armsse-cpuid", 0x1000);
 107    sysbus_init_mmio(sbd, &s->iomem);
 108}
 109
 110static void armsse_cpuid_class_init(ObjectClass *klass, void *data)
 111{
 112    DeviceClass *dc = DEVICE_CLASS(klass);
 113
 114    /*
 115     * This device has no guest-modifiable state and so it
 116     * does not need a reset function or VMState.
 117     */
 118
 119    dc->props = armsse_cpuid_props;
 120}
 121
 122static const TypeInfo armsse_cpuid_info = {
 123    .name = TYPE_ARMSSE_CPUID,
 124    .parent = TYPE_SYS_BUS_DEVICE,
 125    .instance_size = sizeof(ARMSSECPUID),
 126    .instance_init = armsse_cpuid_init,
 127    .class_init = armsse_cpuid_class_init,
 128};
 129
 130static void armsse_cpuid_register_types(void)
 131{
 132    type_register_static(&armsse_cpuid_info);
 133}
 134
 135type_init(armsse_cpuid_register_types);
 136