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The Security Identifier device found in various Allwinner System on Chip designs gives applications a per-board unique identifier. This commit adds support for the Allwinner Security Identifier using a 128-bit UUID value as input. Signed-off-by: Niek Linnenbank <nieklinnenbank@gmail.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-id: 20200311221854.30370-8-nieklinnenbank@gmail.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>pull/88/head
Niek Linnenbank
7 years ago
committed by
Peter Maydell
Peter Maydell
7 changed files with 254 additions and 1 deletions
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/*
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* Allwinner Security ID emulation |
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* |
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* Copyright (C) 2019 Niek Linnenbank <nieklinnenbank@gmail.com> |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/ |
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#include "qemu/osdep.h" |
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#include "qemu/units.h" |
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#include "hw/sysbus.h" |
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#include "migration/vmstate.h" |
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#include "qemu/log.h" |
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#include "qemu/module.h" |
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#include "qemu/guest-random.h" |
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#include "qapi/error.h" |
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#include "hw/qdev-properties.h" |
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#include "hw/misc/allwinner-sid.h" |
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#include "trace.h" |
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/* SID register offsets */ |
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enum { |
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REG_PRCTL = 0x40, /* Control */ |
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REG_RDKEY = 0x60, /* Read Key */ |
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}; |
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/* SID register flags */ |
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enum { |
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REG_PRCTL_WRITE = 0x0002, /* Unknown write flag */ |
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REG_PRCTL_OP_LOCK = 0xAC00, /* Lock operation */ |
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}; |
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static uint64_t allwinner_sid_read(void *opaque, hwaddr offset, |
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unsigned size) |
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{ |
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const AwSidState *s = AW_SID(opaque); |
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uint64_t val = 0; |
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switch (offset) { |
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case REG_PRCTL: /* Control */ |
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val = s->control; |
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break; |
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case REG_RDKEY: /* Read Key */ |
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val = s->rdkey; |
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break; |
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default: |
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qemu_log_mask(LOG_GUEST_ERROR, "%s: out-of-bounds offset 0x%04x\n", |
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__func__, (uint32_t)offset); |
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return 0; |
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} |
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trace_allwinner_sid_read(offset, val, size); |
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return val; |
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} |
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static void allwinner_sid_write(void *opaque, hwaddr offset, |
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uint64_t val, unsigned size) |
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{ |
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AwSidState *s = AW_SID(opaque); |
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trace_allwinner_sid_write(offset, val, size); |
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switch (offset) { |
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case REG_PRCTL: /* Control */ |
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s->control = val; |
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if ((s->control & REG_PRCTL_OP_LOCK) && |
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(s->control & REG_PRCTL_WRITE)) { |
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uint32_t id = s->control >> 16; |
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if (id <= sizeof(QemuUUID) - sizeof(s->rdkey)) { |
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s->rdkey = ldl_be_p(&s->identifier.data[id]); |
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} |
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} |
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s->control &= ~REG_PRCTL_WRITE; |
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break; |
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case REG_RDKEY: /* Read Key */ |
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break; |
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default: |
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qemu_log_mask(LOG_GUEST_ERROR, "%s: out-of-bounds offset 0x%04x\n", |
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__func__, (uint32_t)offset); |
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break; |
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} |
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} |
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static const MemoryRegionOps allwinner_sid_ops = { |
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.read = allwinner_sid_read, |
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.write = allwinner_sid_write, |
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.endianness = DEVICE_NATIVE_ENDIAN, |
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.valid = { |
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.min_access_size = 4, |
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.max_access_size = 4, |
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}, |
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.impl.min_access_size = 4, |
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}; |
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static void allwinner_sid_reset(DeviceState *dev) |
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{ |
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AwSidState *s = AW_SID(dev); |
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/* Set default values for registers */ |
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s->control = 0; |
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s->rdkey = 0; |
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} |
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static void allwinner_sid_init(Object *obj) |
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{ |
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SysBusDevice *sbd = SYS_BUS_DEVICE(obj); |
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AwSidState *s = AW_SID(obj); |
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/* Memory mapping */ |
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memory_region_init_io(&s->iomem, OBJECT(s), &allwinner_sid_ops, s, |
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TYPE_AW_SID, 1 * KiB); |
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sysbus_init_mmio(sbd, &s->iomem); |
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} |
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static Property allwinner_sid_properties[] = { |
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DEFINE_PROP_UUID_NODEFAULT("identifier", AwSidState, identifier), |
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DEFINE_PROP_END_OF_LIST() |
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}; |
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static const VMStateDescription allwinner_sid_vmstate = { |
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.name = "allwinner-sid", |
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.version_id = 1, |
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.minimum_version_id = 1, |
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.fields = (VMStateField[]) { |
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VMSTATE_UINT32(control, AwSidState), |
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VMSTATE_UINT32(rdkey, AwSidState), |
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VMSTATE_UINT8_ARRAY_V(identifier.data, AwSidState, sizeof(QemuUUID), 1), |
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VMSTATE_END_OF_LIST() |
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} |
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}; |
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static void allwinner_sid_class_init(ObjectClass *klass, void *data) |
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{ |
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DeviceClass *dc = DEVICE_CLASS(klass); |
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dc->reset = allwinner_sid_reset; |
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dc->vmsd = &allwinner_sid_vmstate; |
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device_class_set_props(dc, allwinner_sid_properties); |
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} |
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static const TypeInfo allwinner_sid_info = { |
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.name = TYPE_AW_SID, |
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.parent = TYPE_SYS_BUS_DEVICE, |
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.instance_init = allwinner_sid_init, |
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.instance_size = sizeof(AwSidState), |
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.class_init = allwinner_sid_class_init, |
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}; |
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static void allwinner_sid_register(void) |
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{ |
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type_register_static(&allwinner_sid_info); |
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} |
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type_init(allwinner_sid_register) |
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@ -0,0 +1,60 @@ |
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/*
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* Allwinner Security ID emulation |
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* |
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* Copyright (C) 2019 Niek Linnenbank <nieklinnenbank@gmail.com> |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/ |
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#ifndef HW_MISC_ALLWINNER_SID_H |
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#define HW_MISC_ALLWINNER_SID_H |
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#include "qom/object.h" |
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#include "hw/sysbus.h" |
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#include "qemu/uuid.h" |
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/**
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* Object model |
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* @{ |
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*/ |
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#define TYPE_AW_SID "allwinner-sid" |
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#define AW_SID(obj) \ |
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OBJECT_CHECK(AwSidState, (obj), TYPE_AW_SID) |
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/** @} */ |
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/**
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* Allwinner Security ID object instance state |
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*/ |
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typedef struct AwSidState { |
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/*< private >*/ |
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SysBusDevice parent_obj; |
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/*< public >*/ |
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/** Maps I/O registers in physical memory */ |
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MemoryRegion iomem; |
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/** Control register defines how and what to read */ |
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uint32_t control; |
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/** RdKey register contains the data retrieved by the device */ |
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uint32_t rdkey; |
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/** Stores the emulated device identifier */ |
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QemuUUID identifier; |
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} AwSidState; |
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#endif /* HW_MISC_ALLWINNER_SID_H */ |
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