qemu

ds1225y.c (4898B)

---

 /*
  * QEMU NVRAM emulation for DS1225Y chip
  *
  * Copyright (c) 2007-2008 Hervé Poussineau
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
 
 #include "qemu/osdep.h"
 #include "hw/qdev-properties.h"
 #include "hw/sysbus.h"
 #include "migration/vmstate.h"
 #include "trace.h"
 #include "qemu/error-report.h"
 #include "qemu/module.h"
 #include "qom/object.h"
 
 typedef struct {
     MemoryRegion iomem;
     uint32_t chip_size;
     char *filename;
     FILE *file;
     uint8_t *contents;
 } NvRamState;
 
 static uint64_t nvram_read(void *opaque, hwaddr addr, unsigned size)
 {
     NvRamState *s = opaque;
     uint32_t val;
 
     val = s->contents[addr];
     trace_nvram_read(addr, val);
     return val;
 }
 
 static void nvram_write(void *opaque, hwaddr addr, uint64_t val,
                         unsigned size)
 {
     NvRamState *s = opaque;
 
     val &= 0xff;
     trace_nvram_write(addr, s->contents[addr], val);
 
     s->contents[addr] = val;
     if (s->file) {
         fseek(s->file, addr, SEEK_SET);
         fputc(val, s->file);
         fflush(s->file);
     }
 }
 
 static const MemoryRegionOps nvram_ops = {
     .read = nvram_read,
     .write = nvram_write,
     .impl = {
         .min_access_size = 1,
         .max_access_size = 1,
     },
     .endianness = DEVICE_LITTLE_ENDIAN,
 };
 
 static int nvram_post_load(void *opaque, int version_id)
 {
     NvRamState *s = opaque;
 
     /* Close file, as filename may has changed in load/store process */
     if (s->file) {
         fclose(s->file);
     }
 
     /* Write back nvram contents */
     s->file = s->filename ? fopen(s->filename, "wb") : NULL;
     if (s->file) {
         /* Write back contents, as 'wb' mode cleaned the file */
         if (fwrite(s->contents, s->chip_size, 1, s->file) != 1) {
             printf("nvram_post_load: short write\n");
         }
         fflush(s->file);
     }
 
     return 0;
 }
 
 static const VMStateDescription vmstate_nvram = {
     .name = "nvram",
     .version_id = 0,
     .minimum_version_id = 0,
     .post_load = nvram_post_load,
     .fields = (VMStateField[]) {
         VMSTATE_VARRAY_UINT32(contents, NvRamState, chip_size, 0,
                               vmstate_info_uint8, uint8_t),
         VMSTATE_END_OF_LIST()
     }
 };
 
 #define TYPE_DS1225Y "ds1225y"
 OBJECT_DECLARE_SIMPLE_TYPE(SysBusNvRamState, DS1225Y)
 
 struct SysBusNvRamState {
     SysBusDevice parent_obj;
 
     NvRamState nvram;
 };
 
 static void nvram_sysbus_realize(DeviceState *dev, Error **errp)
 {
     SysBusNvRamState *sys = DS1225Y(dev);
     NvRamState *s = &sys->nvram;
     FILE *file;
 
     s->contents = g_malloc0(s->chip_size);
 
     memory_region_init_io(&s->iomem, OBJECT(s), &nvram_ops, s,
                           "nvram", s->chip_size);
     sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->iomem);
 
     /* Read current file */
     file = s->filename ? fopen(s->filename, "rb") : NULL;
     if (file) {
         /* Read nvram contents */
         if (fread(s->contents, s->chip_size, 1, file) != 1) {
             error_report("nvram_sysbus_realize: short read");
         }
         fclose(file);
     }
     nvram_post_load(s, 0);
 }
 
 static Property nvram_sysbus_properties[] = {
     DEFINE_PROP_UINT32("size", SysBusNvRamState, nvram.chip_size, 0x2000),
     DEFINE_PROP_STRING("filename", SysBusNvRamState, nvram.filename),
     DEFINE_PROP_END_OF_LIST(),
 };
 
 static void nvram_sysbus_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
 
     dc->realize = nvram_sysbus_realize;
     dc->vmsd = &vmstate_nvram;
     device_class_set_props(dc, nvram_sysbus_properties);
 }
 
 static const TypeInfo nvram_sysbus_info = {
     .name          = TYPE_DS1225Y,
     .parent        = TYPE_SYS_BUS_DEVICE,
     .instance_size = sizeof(SysBusNvRamState),
     .class_init    = nvram_sysbus_class_init,
 };
 
 static void nvram_register_types(void)
 {
     type_register_static(&nvram_sysbus_info);
 }
 
 type_init(nvram_register_types)