bios_core.c

Linux下操作Bios的驱动

/*
 * BIOS/Flashrom driver for Linux
 *
 * Copyright (C) 1998-2002 Stefan Reinauer <[e-mail]>
 *
 */

#include <linux/config.h>

#include <linux/pci.h>
#include <linux/errno.h>
#include <linux/vmalloc.h>
#include <linux/init.h>

#ifdef MODVERSIONS
#include <linux/modversions.h>
#endif
#include <linux/module.h>

#include <asm/io.h>

#include "bios.h"
#include "pcisets.h"
#include "flashchips.h"
#include "programming.h"

extern struct file_operations bios_fops;

int bios_proc_register(void);
int bios_proc_unregister(void);

int write = 0;
unsigned char *bios;

spinlock_t bios_lock = SPIN_LOCK_UNLOCKED;


/*
 * ******************************************
 *
 *	Initialization
 *
 * ****************************************** 
 */

int bios_init(void)
{
	printk(KERN_INFO "BIOS driver v" BIOS_VERSION " (writing %s) for " UTS_RELEASE "\n", 
								write?"*enabled*":"disabled");

#if defined(__i386__) || defined(__ia64__) || defined(__alpha__)
# ifndef UTC_BIOS
	if (!pcibios_present())
		return -EBUSY;
#endif
	if (chipset_init())
	  return -EBUSY;
#endif
	flash_probe();

	if (flashcount==0) {
		printk(KERN_WARNING "BIOS: No flash devices found.\n");
		return -EBUSY;
	}
	
	if (register_chrdev(BIOS_MAJOR, "bios",  &bios_fops) == -EBUSY) {
		printk(KERN_WARNING "BIOS: Could not register bios devices.\n");
		return -EBUSY;
	}

#ifdef CONFIG_PROC_FS
	bios_proc_register();
#endif
	return 0;
}

/*
 * ******************************************
 *
 *	module handling
 *
 * ****************************************** 
 */

#ifdef MODULE

MODULE_PARM(write,"i");
MODULE_AUTHOR("Stefan Reinauer <[e-mail]>");

int init_module(void)
{
	return bios_init();
}

void cleanup_module (void)
{
	unsigned int i;
#ifdef CONFIG_PROC_FS
	bios_proc_unregister();
#endif

	/* FIXME if several flashchips are in the same
	 * mapped area, the same address is iounmapped
	 * twice.
	 */
	
	for (i=0; i<flashcount; i++)
		iounmap(flashdevices[i].mapped);
	
	unregister_chrdev(BIOS_MAJOR, "bios");
	printk(KERN_INFO "BIOS driver removed.\n");
}

void inc_mod(void)
{
	MOD_INC_USE_COUNT; 
}

void dec_mod(void)
{
	MOD_DEC_USE_COUNT; 
}

#if LINUX_VERSION_CODE > KERNEL_VERSION(2,4,10)
MODULE_LICENSE("GPL");
#endif

#endif