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 const Property armsse_cpuid_props[] = { 96 DEFINE_PROP_UINT32("CPUID", ARMSSECPUID, cpuid, 0), 97 }; 98 99 static void armsse_cpuid_init(Object *obj) 100 { 101 SysBusDevice *sbd = SYS_BUS_DEVICE(obj); 102 ARMSSECPUID *s = ARMSSE_CPUID(obj); 103 104 memory_region_init_io(&s->iomem, obj, &armsse_cpuid_ops, 105 s, "armsse-cpuid", 0x1000); 106 sysbus_init_mmio(sbd, &s->iomem); 107 } 108 109 static void armsse_cpuid_class_init(ObjectClass *klass, void *data) 110 { 111 DeviceClass *dc = DEVICE_CLASS(klass); 112 113 /* 114 * This device has no guest-modifiable state and so it 115 * does not need a reset function or VMState. 116 */ 117 118 device_class_set_props(dc, armsse_cpuid_props); 119 } 120 121 static const TypeInfo armsse_cpuid_info = { 122 .name = TYPE_ARMSSE_CPUID, 123 .parent = TYPE_SYS_BUS_DEVICE, 124 .instance_size = sizeof(ARMSSECPUID), 125 .instance_init = armsse_cpuid_init, 126 .class_init = armsse_cpuid_class_init, 127 }; 128 129 static void armsse_cpuid_register_types(void) 130 { 131 type_register_static(&armsse_cpuid_info); 132 } 133 134 type_init(armsse_cpuid_register_types); 135