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qemu with hax to log dma reads & writes jcs.org/2018/11/12/vfio
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i.MX: Add code to emulate i.MX7 SNVS IP-block

Add code to emulate SNVS IP-block. Currently only the bits needed to
be able to emulate machine shutdown are implemented.

Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Philippe Mathieu-Daudé <f4bug@amsat.org>
Cc: Marcel Apfelbaum <marcel.apfelbaum@zoho.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: qemu-devel@nongnu.org
Cc: qemu-arm@nongnu.org
Cc: yurovsky@gmail.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

authored by

Andrey Smirnov and committed by
Peter Maydell 0a7bc1c0 067e68e7

+119
+1
hw/misc/Makefile.objs
··· 35 35 obj-$(CONFIG_IMX) += imx6_src.o 36 36 obj-$(CONFIG_IMX) += imx7_ccm.o 37 37 obj-$(CONFIG_IMX) += imx2_wdt.o 38 + obj-$(CONFIG_IMX) += imx7_snvs.o 38 39 obj-$(CONFIG_MILKYMIST) += milkymist-hpdmc.o 39 40 obj-$(CONFIG_MILKYMIST) += milkymist-pfpu.o 40 41 obj-$(CONFIG_MAINSTONE) += mst_fpga.o
+83
hw/misc/imx7_snvs.c
··· 1 + /* 2 + * IMX7 Secure Non-Volatile Storage 3 + * 4 + * Copyright (c) 2018, Impinj, Inc. 5 + * 6 + * Author: Andrey Smirnov <andrew.smirnov@gmail.com> 7 + * 8 + * This work is licensed under the terms of the GNU GPL, version 2 or later. 9 + * See the COPYING file in the top-level directory. 10 + * 11 + * Bare minimum emulation code needed to support being able to shut 12 + * down linux guest gracefully. 13 + */ 14 + 15 + #include "qemu/osdep.h" 16 + #include "hw/misc/imx7_snvs.h" 17 + #include "qemu/log.h" 18 + #include "sysemu/sysemu.h" 19 + 20 + static uint64_t imx7_snvs_read(void *opaque, hwaddr offset, unsigned size) 21 + { 22 + return 0; 23 + } 24 + 25 + static void imx7_snvs_write(void *opaque, hwaddr offset, 26 + uint64_t v, unsigned size) 27 + { 28 + const uint32_t value = v; 29 + const uint32_t mask = SNVS_LPCR_TOP | SNVS_LPCR_DP_EN; 30 + 31 + if (offset == SNVS_LPCR && ((value & mask) == mask)) { 32 + qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN); 33 + } 34 + } 35 + 36 + static const struct MemoryRegionOps imx7_snvs_ops = { 37 + .read = imx7_snvs_read, 38 + .write = imx7_snvs_write, 39 + .endianness = DEVICE_NATIVE_ENDIAN, 40 + .impl = { 41 + /* 42 + * Our device would not work correctly if the guest was doing 43 + * unaligned access. This might not be a limitation on the real 44 + * device but in practice there is no reason for a guest to access 45 + * this device unaligned. 46 + */ 47 + .min_access_size = 4, 48 + .max_access_size = 4, 49 + .unaligned = false, 50 + }, 51 + }; 52 + 53 + static void imx7_snvs_init(Object *obj) 54 + { 55 + SysBusDevice *sd = SYS_BUS_DEVICE(obj); 56 + IMX7SNVSState *s = IMX7_SNVS(obj); 57 + 58 + memory_region_init_io(&s->mmio, obj, &imx7_snvs_ops, s, 59 + TYPE_IMX7_SNVS, 0x1000); 60 + 61 + sysbus_init_mmio(sd, &s->mmio); 62 + } 63 + 64 + static void imx7_snvs_class_init(ObjectClass *klass, void *data) 65 + { 66 + DeviceClass *dc = DEVICE_CLASS(klass); 67 + 68 + dc->desc = "i.MX7 Secure Non-Volatile Storage Module"; 69 + } 70 + 71 + static const TypeInfo imx7_snvs_info = { 72 + .name = TYPE_IMX7_SNVS, 73 + .parent = TYPE_SYS_BUS_DEVICE, 74 + .instance_size = sizeof(IMX7SNVSState), 75 + .instance_init = imx7_snvs_init, 76 + .class_init = imx7_snvs_class_init, 77 + }; 78 + 79 + static void imx7_snvs_register_type(void) 80 + { 81 + type_register_static(&imx7_snvs_info); 82 + } 83 + type_init(imx7_snvs_register_type)
+35
include/hw/misc/imx7_snvs.h
··· 1 + /* 2 + * Copyright (c) 2017, Impinj, Inc. 3 + * 4 + * i.MX7 SNVS block emulation code 5 + * 6 + * Author: Andrey Smirnov <andrew.smirnov@gmail.com> 7 + * 8 + * This work is licensed under the terms of the GNU GPL, version 2 or later. 9 + * See the COPYING file in the top-level directory. 10 + */ 11 + 12 + #ifndef IMX7_SNVS_H 13 + #define IMX7_SNVS_H 14 + 15 + #include "qemu/bitops.h" 16 + #include "hw/sysbus.h" 17 + 18 + 19 + enum IMX7SNVSRegisters { 20 + SNVS_LPCR = 0x38, 21 + SNVS_LPCR_TOP = BIT(6), 22 + SNVS_LPCR_DP_EN = BIT(5) 23 + }; 24 + 25 + #define TYPE_IMX7_SNVS "imx7.snvs" 26 + #define IMX7_SNVS(obj) OBJECT_CHECK(IMX7SNVSState, (obj), TYPE_IMX7_SNVS) 27 + 28 + typedef struct IMX7SNVSState { 29 + /* <private> */ 30 + SysBusDevice parent_obj; 31 + 32 + MemoryRegion mmio; 33 + } IMX7SNVSState; 34 + 35 + #endif /* IMX7_SNVS_H */