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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-7.1/] [sim/] [ppc/] [hw_nvram.c] - Blame information for rev 834

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1 227 jeremybenn
/*  This file is part of the program psim.
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    Copyright (C) 1994-1996, Andrew Cagney <cagney@highland.com.au>
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    This program is free software; you can redistribute it and/or modify
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    it under the terms of the GNU General Public License as published by
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    the Free Software Foundation; either version 2 of the License, or
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    (at your option) any later version.
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    This program is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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    GNU General Public License for more details.
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    You should have received a copy of the GNU General Public License
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    along with this program; if not, write to the Free Software
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    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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    */
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#ifndef _HW_NVRAM_C_
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#define _HW_NVRAM_C_
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#ifndef STATIC_INLINE_HW_NVRAM
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#define STATIC_INLINE_HW_NVRAM STATIC_INLINE
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#endif
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#include "device_table.h"
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#ifdef HAVE_TIME_H
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#include <time.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#else
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#ifdef HAVE_STRINGS_H
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#include <strings.h>
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#endif
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#endif
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/* DEVICE
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   nvram - non-volatile memory with clock
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   DESCRIPTION
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   This device implements a small byte addressable non-volatile
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   memory.  The top 8 bytes of this memory include a real-time clock.
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   PROPERTIES
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   reg = <address> <size> (required)
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   Specify the address/size of this device within its parents address
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   space.
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   timezone = <integer> (optional)
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   Adjustment to the hosts current GMT (in seconds) that should be
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   applied when updating the NVRAM's clock.  If no timezone is
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   specified, zero (GMT or UCT) is assumed.
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   */
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typedef struct _hw_nvram_device {
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  unsigned8 *memory;
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  unsigned sizeof_memory;
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#ifdef HAVE_TIME_H
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  time_t host_time;
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#else
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  long host_time;
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#endif
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  unsigned timezone;
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  /* useful */
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  unsigned addr_year;
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  unsigned addr_month;
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  unsigned addr_date;
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  unsigned addr_day;
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  unsigned addr_hour;
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  unsigned addr_minutes;
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  unsigned addr_seconds;
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  unsigned addr_control;
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} hw_nvram_device;
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static void *
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hw_nvram_create(const char *name,
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                const device_unit *unit_address,
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                const char *args)
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{
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  hw_nvram_device *nvram = ZALLOC(hw_nvram_device);
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  return nvram;
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}
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typedef struct _hw_nvram_reg_spec {
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  unsigned32 base;
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  unsigned32 size;
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} hw_nvram_reg_spec;
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static void
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hw_nvram_init_address(device *me)
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{
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  hw_nvram_device *nvram = (hw_nvram_device*)device_data(me);
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  /* use the generic init code to attach this device to its parent bus */
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  generic_device_init_address(me);
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  /* find the first non zero reg property and use that as the device
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     size */
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  if (nvram->sizeof_memory == 0) {
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    reg_property_spec reg;
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    int reg_nr;
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    for (reg_nr = 0;
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         device_find_reg_array_property(me, "reg", reg_nr, &reg);
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         reg_nr++) {
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      unsigned attach_size;
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      if (device_size_to_attach_size(device_parent(me),
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                                     &reg.size, &attach_size,
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                                     me)) {
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        nvram->sizeof_memory = attach_size;
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        break;
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      }
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    }
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    if (nvram->sizeof_memory == 0)
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      device_error(me, "reg property must contain a non-zero phys-addr:size tupple");
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    if (nvram->sizeof_memory < 8)
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      device_error(me, "NVRAM must be at least 8 bytes in size");
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  }
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  /* initialize the hw_nvram */
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  if (nvram->memory == NULL) {
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    nvram->memory = zalloc(nvram->sizeof_memory);
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  }
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  else
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    memset(nvram->memory, 0, nvram->sizeof_memory);
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  if (device_find_property(me, "timezone") == NULL)
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    nvram->timezone = 0;
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  else
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    nvram->timezone = device_find_integer_property(me, "timezone");
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  nvram->addr_year = nvram->sizeof_memory - 1;
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  nvram->addr_month = nvram->sizeof_memory - 2;
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  nvram->addr_date = nvram->sizeof_memory - 3;
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  nvram->addr_day = nvram->sizeof_memory - 4;
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  nvram->addr_hour = nvram->sizeof_memory - 5;
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  nvram->addr_minutes = nvram->sizeof_memory - 6;
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  nvram->addr_seconds = nvram->sizeof_memory - 7;
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  nvram->addr_control = nvram->sizeof_memory - 8;
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}
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static int
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hw_nvram_bcd(int val)
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{
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  val = val % 100;
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  if (val < 0)
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    val += 100;
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  return ((val / 10) << 4) + (val % 10);
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}
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/* If reached an update interval and allowed, update the clock within
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   the hw_nvram.  While this function could be implemented using events
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   it isn't on the assumption that the HW_NVRAM will hardly ever be
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   referenced and hence there is little need in keeping the clock
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   continually up-to-date */
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static void
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hw_nvram_update_clock(hw_nvram_device *nvram,
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                      cpu *processor)
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{
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#ifdef HAVE_TIME_H
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  if (!(nvram->memory[nvram->addr_control] & 0xc0)) {
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    time_t host_time = time(NULL);
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    if (nvram->host_time != host_time) {
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      time_t nvtime = host_time + nvram->timezone;
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      struct tm *clock = gmtime(&nvtime);
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      nvram->host_time = host_time;
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      nvram->memory[nvram->addr_year] = hw_nvram_bcd(clock->tm_year);
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      nvram->memory[nvram->addr_month] = hw_nvram_bcd(clock->tm_mon + 1);
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      nvram->memory[nvram->addr_date] = hw_nvram_bcd(clock->tm_mday);
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      nvram->memory[nvram->addr_day] = hw_nvram_bcd(clock->tm_wday + 1);
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      nvram->memory[nvram->addr_hour] = hw_nvram_bcd(clock->tm_hour);
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      nvram->memory[nvram->addr_minutes] = hw_nvram_bcd(clock->tm_min);
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      nvram->memory[nvram->addr_seconds] = hw_nvram_bcd(clock->tm_sec);
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    }
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  }
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#else
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  error("fixme - where do I find out GMT\n");
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#endif
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}
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static void
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hw_nvram_set_clock(hw_nvram_device *nvram, cpu *processor)
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{
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  error ("fixme - how do I set the localtime\n");
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}
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static unsigned
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hw_nvram_io_read_buffer(device *me,
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                        void *dest,
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                        int space,
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                        unsigned_word addr,
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                        unsigned nr_bytes,
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                        cpu *processor,
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                        unsigned_word cia)
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{
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  int i;
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  hw_nvram_device *nvram = (hw_nvram_device*)device_data(me);
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  for (i = 0; i < nr_bytes; i++) {
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    unsigned address = (addr + i) % nvram->sizeof_memory;
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    unsigned8 data = nvram->memory[address];
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    hw_nvram_update_clock(nvram, processor);
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    ((unsigned8*)dest)[i] = data;
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  }
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  return nr_bytes;
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}
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static unsigned
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hw_nvram_io_write_buffer(device *me,
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                         const void *source,
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                         int space,
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                         unsigned_word addr,
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                         unsigned nr_bytes,
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                         cpu *processor,
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                         unsigned_word cia)
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{
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  int i;
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  hw_nvram_device *nvram = (hw_nvram_device*)device_data(me);
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  for (i = 0; i < nr_bytes; i++) {
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    unsigned address = (addr + i) % nvram->sizeof_memory;
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    unsigned8 data = ((unsigned8*)source)[i];
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    if (address == nvram->addr_control
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        && (data & 0x80) == 0
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        && (nvram->memory[address] & 0x80) == 0x80)
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      hw_nvram_set_clock(nvram, processor);
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    else
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      hw_nvram_update_clock(nvram, processor);
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    nvram->memory[address] = data;
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  }
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  return nr_bytes;
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}
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static device_callbacks const hw_nvram_callbacks = {
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  { hw_nvram_init_address, },
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  { NULL, }, /* address */
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  { hw_nvram_io_read_buffer, hw_nvram_io_write_buffer }, /* IO */
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};
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const device_descriptor hw_nvram_device_descriptor[] = {
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  { "nvram", hw_nvram_create, &hw_nvram_callbacks },
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  { NULL },
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};
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#endif /* _HW_NVRAM_C_ */

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