/* * system.c - a driver for reserving pnp system resources * * Some code is based on pnpbios_core.c * Copyright 2002 Adam Belay <ambx1@neo.rr.com> * */ #include <linux/pnp.h>#include <linux/device.h>#include <linux/init.h>#include <linux/slab.h>#include <linux/kernel.h>#include <linux/ioport.h> static const struct pnp_device_id pnp_dev_table[] = {	/* General ID for reserving resources */	{	"PNP0c02",		0	},	/* memory controller */	{	"PNP0c01",		0	},	{	"",			0	}}; static void reserve_ioport_range(char *pnpid, int start, int end){	struct resource *res;	char *regionid; 	regionid = kmalloc(16, GFP_KERNEL);	if ( regionid == NULL )		return;	snprintf(regionid, 16, "pnp %s", pnpid);	res = request_region(start,end-start+1,regionid);	if ( res == NULL )		kfree( regionid );	else		res->flags &= ~IORESOURCE_BUSY;	/*	 * Failures at this point are usually harmless. pci quirks for	 * example do reserve stuff they know about too, so we may well	 * have double reservations.	 */	printk(KERN_INFO		"pnp: %s: ioport range 0x%x-0x%x %s reserved\n",		pnpid, start, end,		NULL != res ? "has been" : "could not be"	); 	return;} static void reserve_resources_of_dev( struct pnp_dev *dev ){	int i; 	for (i=0;i<PNP_MAX_PORT;i++) {		if (!pnp_port_valid(dev, i))			/* end of resources */			continue;		if (pnp_port_start(dev, i) == 0)			/* disabled */			/* Do nothing */			continue;		if (pnp_port_start(dev, i) < 0x100)			/*			 * Below 0x100 is only standard PC hardware			 * (pics, kbd, timer, dma, ...)			 * We should not get resource conflicts there,			 * and the kernel reserves these anyway			 * (see arch/i386/kernel/setup.c).			 * So, do nothing			 */			continue;		if (pnp_port_end(dev, i) < pnp_port_start(dev, i))			/* invalid endpoint */			/* Do nothing */			continue;		reserve_ioport_range(			dev->dev.bus_id,			pnp_port_start(dev, i),			pnp_port_end(dev, i)		);	} 	return;} static int system_pnp_probe(struct pnp_dev * dev, const struct pnp_device_id *dev_id){	reserve_resources_of_dev(dev);	return 0;} static struct pnp_driver system_pnp_driver = {	.name		= "system",	.id_table	= pnp_dev_table,	.flags		= PNP_DRIVER_RES_DO_NOT_CHANGE,	.probe		= system_pnp_probe,	.remove		= NULL,}; static int __init pnp_system_init(void){	return pnp_register_driver(&system_pnp_driver);} /** * Reserve motherboard resources after PCI claim BARs, * but before PCI assign resources for uninitialized PCI devices */fs_initcall(pnp_system_init);