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  * https://developer.arm.com/documentation/101104/latest/
  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 "hw/sysbus.h"
  27 #include "hw/registerfields.h"
  28 #include "hw/misc/armsse-cpuid.h"
  29 #include "hw/qdev-properties.h"
  30
  31 REG32(CPUID, 0x0)
  32 REG32(PID4, 0xfd0)
  33 REG32(PID5, 0xfd4)
  34 REG32(PID6, 0xfd8)
  35 REG32(PID7, 0xfdc)
  36 REG32(PID0, 0xfe0)
  37 REG32(PID1, 0xfe4)
  38 REG32(PID2, 0xfe8)
  39 REG32(PID3, 0xfec)
  40 REG32(CID0, 0xff0)
  41 REG32(CID1, 0xff4)
  42 REG32(CID2, 0xff8)
  43 REG32(CID3, 0xffc)
  44
  45 /* PID/CID values */
  46 static 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
  52 static 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
  75 static 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
  84 static 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
  95 static Property armsse_cpuid_props[] = {
  96     DEFINE_PROP_UINT32("CPUID", ARMSSECPUID, cpuid, 0),
  97     DEFINE_PROP_END_OF_LIST()
  98 };
  99
 100 static 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
 110 static 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     device_class_set_props(dc, armsse_cpuid_props);
 120 }
 121
 122 static 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
 130 static void armsse_cpuid_register_types(void)
 131 {
 132     type_register_static(&armsse_cpuid_info);
 133 }
 134
 135 type_init(armsse_cpuid_register_types);