/* * pcidata.c --  a module that dumps the cfg registers through /proc * * Tested with 2.0 (intel) * Tested with 2.1.43 (intel) * * Copyright (C) 1997   rubini@linux.it (Alessandro Rubini) * *   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., 675 Mass Ave, Cambridge, MA 02139, USA. */#ifndef __KERNEL__#  define __KERNEL__#endif#ifndef MODULE#  define MODULE#endif#include <linux/module.h>#include <linux/sched.h>#include <linux/proc_fs.h>#include <linux/bios32.h> /* pcibios_* */#include <linux/pci.h>#include "sysdep-2.1.h"/* * This simple module offers in a /proc file the binary * configuration data of available PCI devices. * Each device has 256 bytes of cfg data: 16 devices * can fit in a page (32 on the alpha). */int pcimod_read_proc(char *buf, char **start, off_t offset,                   int len, int unused){    int i, pos=0;    int bus, fun;    unsigned char headertype=0;    unsigned int id;    if (!pcibios_present())        return sprintf(buf,"No PCI bios present\n");    /*     * This code is derived from "drivers/pci/pci.c". This means that     * the GPL applies to this source file and credit is due to the     * original authors (Drew Eckhardt, Frederic Potter, David     * Mosberger-Tang)     */    for (bus=0; !bus; bus++) { /* only bus 0 :-) */        for (fun=0; fun < 0x100 && pos < PAGE_SIZE; fun++) {            if (!PCI_FUNC(fun)) /* first function */                pcibios_read_config_byte(bus,fun,PCI_HEADER_TYPE,&headertype);            else if (!(headertype&0x80))                continue;            pcibios_read_config_dword(bus,fun,PCI_VENDOR_ID, &id);            if (!id || id==~0) {                headertype=0; continue;            }            /* Ok, we've found a device, copy its cfg space to the buffer*/            for (i=0; i<256; i+=4, pos+=4)                pcibios_read_config_dword(bus,fun,i,(u32 *)(buf+pos));        }    }    return pos;}struct proc_dir_entry pcimod_proc_entry = {        0,                 /* low_ino: the inode -- dynamic */        7, "pcidata",      /* len of name and name */        S_IFREG | S_IRUGO, /* mode */        1, 0, 0,           /* nlinks, owner, group */        0, NULL,           /* size - unused; operations -- use default */        &pcimod_read_proc,   /* function used to read data */        /* nothing more */    };int init_module(void){    proc_register_dynamic(&proc_root, &pcimod_proc_entry);    return 0;}void cleanup_module(void){    proc_unregister(&proc_root, pcimod_proc_entry.low_ino);    return;}