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/*
* NVRAM WakeUp
* Copyright (C) 2001-2004, Sergei Haller.
*
* $Id: nvramops.c 682 2004-05-03 22:40:13Z bistr-o-math $
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/io.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <syslog.h>
#include "nvram-wakeup.h"
int fd_rtc, fd_nvram;
void open_nvram(int _directisa, int mode) {
if (_directisa == OFF) {
char mode_str[10];
switch (mode) {
case O_RDONLY: sprintf(mode_str, "O_RDONLY"); break;
case O_WRONLY: sprintf(mode_str, "O_WRONLY"); break;
default: sprintf(mode_str, "%d", mode); break;
}
/* open the nvram device */
nvprintf(LOG_DEBUG, "Opening %s in %s mode...\n", NVRAM_DEV, mode_str);
fd_nvram = open(NVRAM_DEV, mode);
if (fd_nvram == -1) {
nvprintf(LOG_ERR, "%s: %m\n", NVRAM_DEV);
exit(2);
}
}
else {
/* get permission */
nvprintf(LOG_DEBUG, "Requesting permissions for io ports 0x70...0x75\n");
if (ioperm(0x70, 6, 1) == -1) {
nvprintf(LOG_ERR, "An error occurred while requesting permissions: %m\n");
exit(2);
}
}
}
void close_nvram(int _directisa) {
if (_directisa == OFF) {
/* close the nvram device again */
close(fd_nvram);
}
else {
/* release ports */
ioperm( 0x70, 4, 0 );
}
}
int read_whole_nvram(int _directisa, int upper_method, unsigned char * bytes) {
int addr;
char reg_A;
int nvramSize = 0;
if (_directisa == OFF) {
/* Now we read whole nvram ... */
lseek(fd_nvram, 0, SEEK_SET); /* just to be sure we are at the beginning */
nvramSize = read(fd_nvram, bytes, MAXNVRAMSIZE);
if (nvramSize < 0) {
nvprintf(LOG_ERR, "An error occurred while reading nvram: %m\n");
exit(2);
}
}
else /* if (_directisa == ON) */ {
for(addr=0;addr<=13;addr++) {
outb(addr, 0x70);
bytes[addr+114] = inb(0x71);
}
for(addr=14;addr<=127;addr++) {
outb(addr, 0x70);
bytes[addr-14] = inb(0x71);
}
switch (upper_method) {
case OFF:
nvramSize = 128;
break;
case INTEL:
for(addr=0;addr<=127;addr++) {
outb(addr, 0x72);
bytes[addr+128] = inb(0x73);
}
nvramSize = 256;
break;
case DS1685:
reg_A = bytes[0xA+114];
outb(0xA, 0x70);
outb(reg_A | 0x10, 0x71); /* set bit 4 of register A and enable upper nvram access */
for(addr=0;addr<=127;addr++) {
outb(addr, 0x70);
bytes[addr+128] = inb(0x71);
}
outb(0xA, 0x70);
outb(reg_A, 0x71); /* restore contents of register A */
nvramSize = 256;
break;
case VT82Cxxx:
for(addr=128;addr<=255;addr++) {
outb(addr, 0x72);
bytes[addr] = inb(0x73);
}
nvramSize = 256;
break;
case VT8235_37:
for(addr=128;addr<=255;addr++) {
outb(addr, 0x74);
bytes[addr] = inb(0x75);
}
nvramSize = 256;
break;
default:
nvramSize = 128;
break;
}
}
nvprintf(LOG_DEBUG, "The size of NVRAM is %u bytes.\n", nvramSize);
return nvramSize;
}
void write_back(int _directisa, int upper_method, int addr, unsigned char * bytes) {
int retval;
char reg_A = bytes[0xA+114];
nvprintf(LOG_DEBUG, "Writing value 0x%02X into byte 0x%02X of NVRAM\n", bytes[addr], addr);
if (_directisa == OFF) {
lseek(fd_nvram, addr, SEEK_SET);
retval = write(fd_nvram, &bytes[addr], 1);
if (retval != 1) {
nvprintf(LOG_CRIT, "Error occurred while writing byte 0x%02X of %s: %m\n", addr, NVRAM_DEV);
exit(2);
}
}
else /* _directisa == ON */ {
if (addr<114) {
outb(addr+14, 0x70);
outb(bytes[addr], 0x71);
}
else if (addr<128) {
outb(addr-114, 0x70);
outb(bytes[addr], 0x71);
}
/* upper nvram needs special treatment */
else switch (upper_method) {
case INTEL:
outb(addr-128, 0x72);
outb(bytes[addr], 0x73);
break;
case DS1685:
outb(0xA, 0x70);
outb(reg_A | 0x10, 0x71); /* set bit 4 of register A and enable upper nvram access */
outb(addr-128, 0x70);
outb(bytes[addr], 0x71);
outb(0xA, 0x70);
outb(reg_A, 0x71); /* restore contents of register A */
break;
case VT82Cxxx:
outb(addr, 0x72);
outb(bytes[addr], 0x73);
break;
case VT8235_37:
outb(addr, 0x74);
outb(bytes[addr], 0x75);
break;
}
}
}
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