1 /* 2 * Allwinner Security ID emulation 3 * 4 * Copyright (C) 2019 Niek Linnenbank <nieklinnenbank@gmail.com> 5 * 6 * This program is free software: you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation, either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program. If not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #include "qemu/osdep.h" 21 #include "qemu/units.h" 22 #include "hw/sysbus.h" 23 #include "migration/vmstate.h" 24 #include "qemu/log.h" 25 #include "qemu/module.h" 26 #include "qemu/guest-random.h" 27 #include "qapi/error.h" 28 #include "hw/qdev-properties.h" 29 #include "hw/misc/allwinner-sid.h" 30 #include "trace.h" 31 32 /* SID register offsets */ 33 enum { 34 REG_PRCTL = 0x40, /* Control */ 35 REG_RDKEY = 0x60, /* Read Key */ 36 }; 37 38 /* SID register flags */ 39 enum { 40 REG_PRCTL_WRITE = 0x0002, /* Unknown write flag */ 41 REG_PRCTL_OP_LOCK = 0xAC00, /* Lock operation */ 42 }; 43 44 static uint64_t allwinner_sid_read(void *opaque, hwaddr offset, 45 unsigned size) 46 { 47 const AwSidState *s = AW_SID(opaque); 48 uint64_t val = 0; 49 50 switch (offset) { 51 case REG_PRCTL: /* Control */ 52 val = s->control; 53 break; 54 case REG_RDKEY: /* Read Key */ 55 val = s->rdkey; 56 break; 57 default: 58 qemu_log_mask(LOG_GUEST_ERROR, "%s: out-of-bounds offset 0x%04x\n", 59 __func__, (uint32_t)offset); 60 return 0; 61 } 62 63 trace_allwinner_sid_read(offset, val, size); 64 65 return val; 66 } 67 68 static void allwinner_sid_write(void *opaque, hwaddr offset, 69 uint64_t val, unsigned size) 70 { 71 AwSidState *s = AW_SID(opaque); 72 73 trace_allwinner_sid_write(offset, val, size); 74 75 switch (offset) { 76 case REG_PRCTL: /* Control */ 77 s->control = val; 78 79 if ((s->control & REG_PRCTL_OP_LOCK) && 80 (s->control & REG_PRCTL_WRITE)) { 81 uint32_t id = s->control >> 16; 82 83 if (id <= sizeof(QemuUUID) - sizeof(s->rdkey)) { 84 s->rdkey = ldl_be_p(&s->identifier.data[id]); 85 } 86 } 87 s->control &= ~REG_PRCTL_WRITE; 88 break; 89 case REG_RDKEY: /* Read Key */ 90 break; 91 default: 92 qemu_log_mask(LOG_GUEST_ERROR, "%s: out-of-bounds offset 0x%04x\n", 93 __func__, (uint32_t)offset); 94 break; 95 } 96 } 97 98 static const MemoryRegionOps allwinner_sid_ops = { 99 .read = allwinner_sid_read, 100 .write = allwinner_sid_write, 101 .endianness = DEVICE_NATIVE_ENDIAN, 102 .valid = { 103 .min_access_size = 4, 104 .max_access_size = 4, 105 }, 106 .impl.min_access_size = 4, 107 }; 108 109 static void allwinner_sid_reset(DeviceState *dev) 110 { 111 AwSidState *s = AW_SID(dev); 112 113 /* Set default values for registers */ 114 s->control = 0; 115 s->rdkey = 0; 116 } 117 118 static void allwinner_sid_init(Object *obj) 119 { 120 SysBusDevice *sbd = SYS_BUS_DEVICE(obj); 121 AwSidState *s = AW_SID(obj); 122 123 /* Memory mapping */ 124 memory_region_init_io(&s->iomem, OBJECT(s), &allwinner_sid_ops, s, 125 TYPE_AW_SID, 1 * KiB); 126 sysbus_init_mmio(sbd, &s->iomem); 127 } 128 129 static Property allwinner_sid_properties[] = { 130 DEFINE_PROP_UUID_NODEFAULT("identifier", AwSidState, identifier), 131 DEFINE_PROP_END_OF_LIST() 132 }; 133 134 static const VMStateDescription allwinner_sid_vmstate = { 135 .name = "allwinner-sid", 136 .version_id = 1, 137 .minimum_version_id = 1, 138 .fields = (VMStateField[]) { 139 VMSTATE_UINT32(control, AwSidState), 140 VMSTATE_UINT32(rdkey, AwSidState), 141 VMSTATE_UINT8_ARRAY_V(identifier.data, AwSidState, sizeof(QemuUUID), 1), 142 VMSTATE_END_OF_LIST() 143 } 144 }; 145 146 static void allwinner_sid_class_init(ObjectClass *klass, void *data) 147 { 148 DeviceClass *dc = DEVICE_CLASS(klass); 149 150 dc->reset = allwinner_sid_reset; 151 dc->vmsd = &allwinner_sid_vmstate; 152 device_class_set_props(dc, allwinner_sid_properties); 153 } 154 155 static const TypeInfo allwinner_sid_info = { 156 .name = TYPE_AW_SID, 157 .parent = TYPE_SYS_BUS_DEVICE, 158 .instance_init = allwinner_sid_init, 159 .instance_size = sizeof(AwSidState), 160 .class_init = allwinner_sid_class_init, 161 }; 162 163 static void allwinner_sid_register(void) 164 { 165 type_register_static(&allwinner_sid_info); 166 } 167 168 type_init(allwinner_sid_register) 169