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68ed285428
Since we require C11 now, we can assume many headers exist, and clean up all of the conditional includes. It's not like any of this code actually accounted for the headers not existing, just whether we could include them. The strings.h cleanup is a little nuanced: it isn't in C11, but every use of it in the codebase will include strings.h only if string.h doesn't exist. Since we now assume the C11 string.h exists, we'll never include strings.h, so we can delete it.
247 lines
6.5 KiB
C
247 lines
6.5 KiB
C
/* 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 3 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, see <http://www.gnu.org/licenses/>.
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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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#include <time.h>
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#include <string.h>
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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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time_t host_time;
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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, ®);
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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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®.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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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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}
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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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