84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
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/*
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* IMX7 Secure Non-Volatile Storage
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*
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* Copyright (c) 2018, Impinj, Inc.
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*
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* Author: Andrey Smirnov <andrew.smirnov@gmail.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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* Bare minimum emulation code needed to support being able to shut
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* down linux guest gracefully.
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*/
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#include "qemu/osdep.h"
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#include "hw/misc/imx7_snvs.h"
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#include "qemu/log.h"
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#include "sysemu/sysemu.h"
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static uint64_t imx7_snvs_read(void *opaque, hwaddr offset, unsigned size)
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{
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return 0;
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}
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static void imx7_snvs_write(void *opaque, hwaddr offset,
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uint64_t v, unsigned size)
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{
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const uint32_t value = v;
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const uint32_t mask = SNVS_LPCR_TOP | SNVS_LPCR_DP_EN;
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if (offset == SNVS_LPCR && ((value & mask) == mask)) {
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qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
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}
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}
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static const struct MemoryRegionOps imx7_snvs_ops = {
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.read = imx7_snvs_read,
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.write = imx7_snvs_write,
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.endianness = DEVICE_NATIVE_ENDIAN,
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.impl = {
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/*
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* Our device would not work correctly if the guest was doing
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* unaligned access. This might not be a limitation on the real
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* device but in practice there is no reason for a guest to access
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* this device unaligned.
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*/
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.min_access_size = 4,
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.max_access_size = 4,
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.unaligned = false,
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},
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};
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static void imx7_snvs_init(Object *obj)
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{
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SysBusDevice *sd = SYS_BUS_DEVICE(obj);
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IMX7SNVSState *s = IMX7_SNVS(obj);
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memory_region_init_io(&s->mmio, obj, &imx7_snvs_ops, s,
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TYPE_IMX7_SNVS, 0x1000);
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sysbus_init_mmio(sd, &s->mmio);
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}
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static void imx7_snvs_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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dc->desc = "i.MX7 Secure Non-Volatile Storage Module";
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}
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static const TypeInfo imx7_snvs_info = {
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.name = TYPE_IMX7_SNVS,
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.parent = TYPE_SYS_BUS_DEVICE,
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.instance_size = sizeof(IMX7SNVSState),
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.instance_init = imx7_snvs_init,
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.class_init = imx7_snvs_class_init,
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};
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static void imx7_snvs_register_type(void)
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{
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type_register_static(&imx7_snvs_info);
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}
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type_init(imx7_snvs_register_type)
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