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

ds1225y.c (4898B)

      1/*
      2 * QEMU NVRAM emulation for DS1225Y chip
      3 *
      4 * Copyright (c) 2007-2008 Hervé Poussineau
      5 *
      6 * Permission is hereby granted, free of charge, to any person obtaining a copy
      7 * of this software and associated documentation files (the "Software"), to deal
      8 * in the Software without restriction, including without limitation the rights
      9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     10 * copies of the Software, and to permit persons to whom the Software is
     11 * furnished to do so, subject to the following conditions:
     12 *
     13 * The above copyright notice and this permission notice shall be included in
     14 * all copies or substantial portions of the Software.
     15 *
     16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
     19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
     22 * THE SOFTWARE.
     23 */
     24
     25#include "qemu/osdep.h"
     26#include "hw/qdev-properties.h"
     27#include "hw/sysbus.h"
     28#include "migration/vmstate.h"
     29#include "trace.h"
     30#include "qemu/error-report.h"
     31#include "qemu/module.h"
     32#include "qom/object.h"
     33
     34typedef struct {
     35    MemoryRegion iomem;
     36    uint32_t chip_size;
     37    char *filename;
     38    FILE *file;
     39    uint8_t *contents;
     40} NvRamState;
     41
     42static uint64_t nvram_read(void *opaque, hwaddr addr, unsigned size)
     43{
     44    NvRamState *s = opaque;
     45    uint32_t val;
     46
     47    val = s->contents[addr];
     48    trace_nvram_read(addr, val);
     49    return val;
     50}
     51
     52static void nvram_write(void *opaque, hwaddr addr, uint64_t val,
     53                        unsigned size)
     54{
     55    NvRamState *s = opaque;
     56
     57    val &= 0xff;
     58    trace_nvram_write(addr, s->contents[addr], val);
     59
     60    s->contents[addr] = val;
     61    if (s->file) {
     62        fseek(s->file, addr, SEEK_SET);
     63        fputc(val, s->file);
     64        fflush(s->file);
     65    }
     66}
     67
     68static const MemoryRegionOps nvram_ops = {
     69    .read = nvram_read,
     70    .write = nvram_write,
     71    .impl = {
     72        .min_access_size = 1,
     73        .max_access_size = 1,
     74    },
     75    .endianness = DEVICE_LITTLE_ENDIAN,
     76};
     77
     78static int nvram_post_load(void *opaque, int version_id)
     79{
     80    NvRamState *s = opaque;
     81
     82    /* Close file, as filename may has changed in load/store process */
     83    if (s->file) {
     84        fclose(s->file);
     85    }
     86
     87    /* Write back nvram contents */
     88    s->file = s->filename ? fopen(s->filename, "wb") : NULL;
     89    if (s->file) {
     90        /* Write back contents, as 'wb' mode cleaned the file */
     91        if (fwrite(s->contents, s->chip_size, 1, s->file) != 1) {
     92            printf("nvram_post_load: short write\n");
     93        }
     94        fflush(s->file);
     95    }
     96
     97    return 0;
     98}
     99
    100static const VMStateDescription vmstate_nvram = {
    101    .name = "nvram",
    102    .version_id = 0,
    103    .minimum_version_id = 0,
    104    .post_load = nvram_post_load,
    105    .fields = (VMStateField[]) {
    106        VMSTATE_VARRAY_UINT32(contents, NvRamState, chip_size, 0,
    107                              vmstate_info_uint8, uint8_t),
    108        VMSTATE_END_OF_LIST()
    109    }
    110};
    111
    112#define TYPE_DS1225Y "ds1225y"
    113OBJECT_DECLARE_SIMPLE_TYPE(SysBusNvRamState, DS1225Y)
    114
    115struct SysBusNvRamState {
    116    SysBusDevice parent_obj;
    117
    118    NvRamState nvram;
    119};
    120
    121static void nvram_sysbus_realize(DeviceState *dev, Error **errp)
    122{
    123    SysBusNvRamState *sys = DS1225Y(dev);
    124    NvRamState *s = &sys->nvram;
    125    FILE *file;
    126
    127    s->contents = g_malloc0(s->chip_size);
    128
    129    memory_region_init_io(&s->iomem, OBJECT(s), &nvram_ops, s,
    130                          "nvram", s->chip_size);
    131    sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->iomem);
    132
    133    /* Read current file */
    134    file = s->filename ? fopen(s->filename, "rb") : NULL;
    135    if (file) {
    136        /* Read nvram contents */
    137        if (fread(s->contents, s->chip_size, 1, file) != 1) {
    138            error_report("nvram_sysbus_realize: short read");
    139        }
    140        fclose(file);
    141    }
    142    nvram_post_load(s, 0);
    143}
    144
    145static Property nvram_sysbus_properties[] = {
    146    DEFINE_PROP_UINT32("size", SysBusNvRamState, nvram.chip_size, 0x2000),
    147    DEFINE_PROP_STRING("filename", SysBusNvRamState, nvram.filename),
    148    DEFINE_PROP_END_OF_LIST(),
    149};
    150
    151static void nvram_sysbus_class_init(ObjectClass *klass, void *data)
    152{
    153    DeviceClass *dc = DEVICE_CLASS(klass);
    154
    155    dc->realize = nvram_sysbus_realize;
    156    dc->vmsd = &vmstate_nvram;
    157    device_class_set_props(dc, nvram_sysbus_properties);
    158}
    159
    160static const TypeInfo nvram_sysbus_info = {
    161    .name          = TYPE_DS1225Y,
    162    .parent        = TYPE_SYS_BUS_DEVICE,
    163    .instance_size = sizeof(SysBusNvRamState),
    164    .class_init    = nvram_sysbus_class_init,
    165};
    166
    167static void nvram_register_types(void)
    168{
    169    type_register_static(&nvram_sysbus_info);
    170}
    171
    172type_init(nvram_register_types)