cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

empty_slot.c (2786B)

      1/*
      2 * QEMU Empty Slot
      3 *
      4 * The empty_slot device emulates known to a bus but not connected devices.
      5 *
      6 * Copyright (c) 2010 Artyom Tarasenko
      7 *
      8 * This code is licensed under the GNU GPL v2 or (at your option) any later
      9 * version.
     10 */
     11
     12#include "qemu/osdep.h"
     13#include "hw/sysbus.h"
     14#include "hw/qdev-properties.h"
     15#include "hw/misc/empty_slot.h"
     16#include "qapi/error.h"
     17#include "trace.h"
     18#include "qom/object.h"
     19
     20#define TYPE_EMPTY_SLOT "empty_slot"
     21OBJECT_DECLARE_SIMPLE_TYPE(EmptySlot, EMPTY_SLOT)
     22
     23struct EmptySlot {
     24    SysBusDevice parent_obj;
     25
     26    MemoryRegion iomem;
     27    char *name;
     28    uint64_t size;
     29};
     30
     31static uint64_t empty_slot_read(void *opaque, hwaddr addr,
     32                                unsigned size)
     33{
     34    EmptySlot *s = EMPTY_SLOT(opaque);
     35
     36    trace_empty_slot_write(addr, size << 1, 0, size, s->name);
     37
     38    return 0;
     39}
     40
     41static void empty_slot_write(void *opaque, hwaddr addr,
     42                             uint64_t val, unsigned size)
     43{
     44    EmptySlot *s = EMPTY_SLOT(opaque);
     45
     46    trace_empty_slot_write(addr, size << 1, val, size, s->name);
     47}
     48
     49static const MemoryRegionOps empty_slot_ops = {
     50    .read = empty_slot_read,
     51    .write = empty_slot_write,
     52    .endianness = DEVICE_NATIVE_ENDIAN,
     53};
     54
     55void empty_slot_init(const char *name, hwaddr addr, uint64_t slot_size)
     56{
     57    if (slot_size > 0) {
     58        /* Only empty slots larger than 0 byte need handling. */
     59        DeviceState *dev;
     60
     61        dev = qdev_new(TYPE_EMPTY_SLOT);
     62
     63        qdev_prop_set_uint64(dev, "size", slot_size);
     64        sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
     65
     66        sysbus_mmio_map_overlap(SYS_BUS_DEVICE(dev), 0, addr, -10000);
     67    }
     68}
     69
     70static void empty_slot_realize(DeviceState *dev, Error **errp)
     71{
     72    EmptySlot *s = EMPTY_SLOT(dev);
     73
     74    if (s->name == NULL) {
     75        s->name = g_strdup("empty-slot");
     76    }
     77    memory_region_init_io(&s->iomem, OBJECT(s), &empty_slot_ops, s,
     78                          s->name, s->size);
     79    sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->iomem);
     80}
     81
     82static Property empty_slot_properties[] = {
     83    DEFINE_PROP_UINT64("size", EmptySlot, size, 0),
     84    DEFINE_PROP_STRING("name", EmptySlot, name),
     85    DEFINE_PROP_END_OF_LIST(),
     86};
     87
     88static void empty_slot_class_init(ObjectClass *klass, void *data)
     89{
     90    DeviceClass *dc = DEVICE_CLASS(klass);
     91
     92    dc->realize = empty_slot_realize;
     93    device_class_set_props(dc, empty_slot_properties);
     94    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
     95}
     96
     97static const TypeInfo empty_slot_info = {
     98    .name          = TYPE_EMPTY_SLOT,
     99    .parent        = TYPE_SYS_BUS_DEVICE,
    100    .instance_size = sizeof(EmptySlot),
    101    .class_init    = empty_slot_class_init,
    102};
    103
    104static void empty_slot_register_types(void)
    105{
    106    type_register_static(&empty_slot_info);
    107}
    108
    109type_init(empty_slot_register_types)