593 lines
14 KiB
C
593 lines
14 KiB
C
/*
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* pnpbios -- PnP BIOS driver
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*
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* This driver provides access to Plug-'n'-Play services provided by
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* the PnP BIOS firmware, described in the following documents:
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* Plug and Play BIOS Specification, Version 1.0A, 5 May 1994
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* Plug and Play BIOS Clarification Paper, 6 October 1994
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* Compaq Computer Corporation, Phoenix Technologies Ltd., Intel Corp.
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*
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* Originally (C) 1998 Christian Schmidt <schmidt@digadd.de>
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* Modifications (C) 1998 Tom Lees <tom@lpsg.demon.co.uk>
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* Minor reorganizations by David Hinds <dahinds@users.sourceforge.net>
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* Further modifications (C) 2001, 2002 by:
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* Alan Cox <alan@redhat.com>
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* Thomas Hood
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* Brian Gerst <bgerst@didntduck.org>
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*
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* Ported to the PnP Layer and several additional improvements (C) 2002
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* by Adam Belay <ambx1@neo.rr.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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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, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/* Change Log
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*
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* Adam Belay - <ambx1@neo.rr.com> - March 16, 2003
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* rev 1.01 Only call pnp_bios_dev_node_info once
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* Added pnpbios_print_status
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* Added several new error messages and info messages
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* Added pnpbios_interface_attach_device
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* integrated core and proc init system
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* Introduced PNPMODE flags
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* Removed some useless includes
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*/
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/linkage.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/pnp.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/slab.h>
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#include <linux/completion.h>
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#include <linux/spinlock.h>
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#include <linux/dmi.h>
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#include <linux/delay.h>
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#include <linux/acpi.h>
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#include <linux/freezer.h>
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#include <linux/kmod.h>
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#include <linux/kthread.h>
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#include <asm/page.h>
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#include <asm/desc.h>
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#include <asm/byteorder.h>
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#include "../base.h"
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#include "pnpbios.h"
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/*
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*
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* PnP BIOS INTERFACE
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*
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*/
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static union pnp_bios_install_struct *pnp_bios_install = NULL;
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int pnp_bios_present(void)
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{
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return (pnp_bios_install != NULL);
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}
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struct pnp_dev_node_info node_info;
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/*
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*
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* DOCKING FUNCTIONS
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*
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*/
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static struct completion unload_sem;
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/*
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* (Much of this belongs in a shared routine somewhere)
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*/
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static int pnp_dock_event(int dock, struct pnp_docking_station_info *info)
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{
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char *argv[3], **envp, *buf, *scratch;
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int i = 0, value;
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if (!(envp = kcalloc(20, sizeof(char *), GFP_KERNEL)))
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return -ENOMEM;
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if (!(buf = kzalloc(256, GFP_KERNEL))) {
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kfree(envp);
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return -ENOMEM;
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}
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/* FIXME: if there are actual users of this, it should be
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* integrated into the driver core and use the usual infrastructure
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* like sysfs and uevents
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*/
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argv[0] = "/sbin/pnpbios";
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argv[1] = "dock";
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argv[2] = NULL;
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/* minimal command environment */
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envp[i++] = "HOME=/";
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envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
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#ifdef DEBUG
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/* hint that policy agent should enter no-stdout debug mode */
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envp[i++] = "DEBUG=kernel";
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#endif
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/* extensible set of named bus-specific parameters,
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* supporting multiple driver selection algorithms.
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*/
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scratch = buf;
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/* action: add, remove */
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envp[i++] = scratch;
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scratch += sprintf(scratch, "ACTION=%s", dock ? "add" : "remove") + 1;
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/* Report the ident for the dock */
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envp[i++] = scratch;
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scratch += sprintf(scratch, "DOCK=%x/%x/%x",
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info->location_id, info->serial, info->capabilities);
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envp[i] = NULL;
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value = call_usermodehelper(argv [0], argv, envp, UMH_WAIT_EXEC);
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kfree(buf);
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kfree(envp);
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return 0;
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}
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/*
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* Poll the PnP docking at regular intervals
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*/
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static int pnp_dock_thread(void *unused)
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{
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static struct pnp_docking_station_info now;
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int docked = -1, d = 0;
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set_freezable();
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while (1) {
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int status;
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/*
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* Poll every 2 seconds
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*/
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msleep_interruptible(2000);
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if (try_to_freeze())
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continue;
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status = pnp_bios_dock_station_info(&now);
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switch (status) {
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/*
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* No dock to manage
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*/
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case PNP_FUNCTION_NOT_SUPPORTED:
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complete_and_exit(&unload_sem, 0);
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case PNP_SYSTEM_NOT_DOCKED:
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d = 0;
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break;
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case PNP_SUCCESS:
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d = 1;
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break;
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default:
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pnpbios_print_status("pnp_dock_thread", status);
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printk(KERN_WARNING "PnPBIOS: disabling dock monitoring.\n");
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complete_and_exit(&unload_sem, 0);
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}
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if (d != docked) {
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if (pnp_dock_event(d, &now) == 0) {
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docked = d;
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#if 0
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printk(KERN_INFO
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"PnPBIOS: Docking station %stached\n",
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docked ? "at" : "de");
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#endif
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}
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}
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}
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complete_and_exit(&unload_sem, 0);
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}
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static int pnpbios_get_resources(struct pnp_dev *dev)
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{
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u8 nodenum = dev->number;
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struct pnp_bios_node *node;
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if (!pnpbios_is_dynamic(dev))
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return -EPERM;
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pnp_dbg(&dev->dev, "get resources\n");
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node = kzalloc(node_info.max_node_size, GFP_KERNEL);
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if (!node)
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return -1;
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if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) {
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kfree(node);
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return -ENODEV;
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}
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pnpbios_read_resources_from_node(dev, node);
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dev->active = pnp_is_active(dev);
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kfree(node);
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return 0;
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}
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static int pnpbios_set_resources(struct pnp_dev *dev)
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{
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u8 nodenum = dev->number;
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struct pnp_bios_node *node;
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int ret;
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if (!pnpbios_is_dynamic(dev))
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return -EPERM;
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pnp_dbg(&dev->dev, "set resources\n");
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node = kzalloc(node_info.max_node_size, GFP_KERNEL);
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if (!node)
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return -1;
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if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) {
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kfree(node);
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return -ENODEV;
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}
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if (pnpbios_write_resources_to_node(dev, node) < 0) {
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kfree(node);
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return -1;
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}
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ret = pnp_bios_set_dev_node(node->handle, (char)PNPMODE_DYNAMIC, node);
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kfree(node);
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if (ret > 0)
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ret = -1;
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return ret;
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}
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static void pnpbios_zero_data_stream(struct pnp_bios_node *node)
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{
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unsigned char *p = (char *)node->data;
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unsigned char *end = (char *)(node->data + node->size);
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unsigned int len;
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int i;
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while ((char *)p < (char *)end) {
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if (p[0] & 0x80) { /* large tag */
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len = (p[2] << 8) | p[1];
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p += 3;
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} else {
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if (((p[0] >> 3) & 0x0f) == 0x0f)
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return;
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len = p[0] & 0x07;
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p += 1;
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}
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for (i = 0; i < len; i++)
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p[i] = 0;
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p += len;
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}
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printk(KERN_ERR
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"PnPBIOS: Resource structure did not contain an end tag.\n");
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}
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static int pnpbios_disable_resources(struct pnp_dev *dev)
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{
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struct pnp_bios_node *node;
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u8 nodenum = dev->number;
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int ret;
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if (dev->flags & PNPBIOS_NO_DISABLE || !pnpbios_is_dynamic(dev))
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return -EPERM;
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node = kzalloc(node_info.max_node_size, GFP_KERNEL);
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if (!node)
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return -ENOMEM;
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if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) {
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kfree(node);
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return -ENODEV;
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}
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pnpbios_zero_data_stream(node);
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ret = pnp_bios_set_dev_node(dev->number, (char)PNPMODE_DYNAMIC, node);
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kfree(node);
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if (ret > 0)
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ret = -1;
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return ret;
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}
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/* PnP Layer support */
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struct pnp_protocol pnpbios_protocol = {
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.name = "Plug and Play BIOS",
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.get = pnpbios_get_resources,
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.set = pnpbios_set_resources,
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.disable = pnpbios_disable_resources,
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};
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static int __init insert_device(struct pnp_bios_node *node)
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{
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struct list_head *pos;
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struct pnp_dev *dev;
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char id[8];
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int error;
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/* check if the device is already added */
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list_for_each(pos, &pnpbios_protocol.devices) {
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dev = list_entry(pos, struct pnp_dev, protocol_list);
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if (dev->number == node->handle)
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return -EEXIST;
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}
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pnp_eisa_id_to_string(node->eisa_id & PNP_EISA_ID_MASK, id);
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dev = pnp_alloc_dev(&pnpbios_protocol, node->handle, id);
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if (!dev)
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return -ENOMEM;
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pnpbios_parse_data_stream(dev, node);
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dev->active = pnp_is_active(dev);
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dev->flags = node->flags;
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if (!(dev->flags & PNPBIOS_NO_CONFIG))
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dev->capabilities |= PNP_CONFIGURABLE;
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if (!(dev->flags & PNPBIOS_NO_DISABLE) && pnpbios_is_dynamic(dev))
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dev->capabilities |= PNP_DISABLE;
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dev->capabilities |= PNP_READ;
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if (pnpbios_is_dynamic(dev))
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dev->capabilities |= PNP_WRITE;
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if (dev->flags & PNPBIOS_REMOVABLE)
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dev->capabilities |= PNP_REMOVABLE;
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/* clear out the damaged flags */
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if (!dev->active)
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pnp_init_resources(dev);
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error = pnp_add_device(dev);
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if (error) {
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put_device(&dev->dev);
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return error;
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}
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pnpbios_interface_attach_device(node);
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return 0;
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}
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static void __init build_devlist(void)
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{
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u8 nodenum;
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unsigned int nodes_got = 0;
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unsigned int devs = 0;
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struct pnp_bios_node *node;
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node = kzalloc(node_info.max_node_size, GFP_KERNEL);
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if (!node)
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return;
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for (nodenum = 0; nodenum < 0xff;) {
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u8 thisnodenum = nodenum;
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/* eventually we will want to use PNPMODE_STATIC here but for now
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* dynamic will help us catch buggy bioses to add to the blacklist.
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*/
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if (!pnpbios_dont_use_current_config) {
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if (pnp_bios_get_dev_node
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(&nodenum, (char)PNPMODE_DYNAMIC, node))
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break;
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} else {
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if (pnp_bios_get_dev_node
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(&nodenum, (char)PNPMODE_STATIC, node))
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break;
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}
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nodes_got++;
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if (insert_device(node) == 0)
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devs++;
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if (nodenum <= thisnodenum) {
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printk(KERN_ERR
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"PnPBIOS: build_devlist: Node number 0x%x is out of sequence following node 0x%x. Aborting.\n",
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(unsigned int)nodenum,
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(unsigned int)thisnodenum);
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break;
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}
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}
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kfree(node);
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printk(KERN_INFO
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"PnPBIOS: %i node%s reported by PnP BIOS; %i recorded by driver\n",
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nodes_got, nodes_got != 1 ? "s" : "", devs);
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}
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/*
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*
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* INIT AND EXIT
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*
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*/
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static int pnpbios_disabled;
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int pnpbios_dont_use_current_config;
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static int __init pnpbios_setup(char *str)
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{
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int invert;
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while ((str != NULL) && (*str != '\0')) {
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if (strncmp(str, "off", 3) == 0)
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pnpbios_disabled = 1;
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if (strncmp(str, "on", 2) == 0)
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pnpbios_disabled = 0;
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invert = (strncmp(str, "no-", 3) == 0);
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if (invert)
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str += 3;
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if (strncmp(str, "curr", 4) == 0)
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pnpbios_dont_use_current_config = invert;
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str = strchr(str, ',');
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if (str != NULL)
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str += strspn(str, ", \t");
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}
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return 1;
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}
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__setup("pnpbios=", pnpbios_setup);
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/* PnP BIOS signature: "$PnP" */
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#define PNP_SIGNATURE (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24))
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static int __init pnpbios_probe_system(void)
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{
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union pnp_bios_install_struct *check;
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u8 sum;
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int length, i;
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printk(KERN_INFO "PnPBIOS: Scanning system for PnP BIOS support...\n");
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/*
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* Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS
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* structure and, if one is found, sets up the selectors and
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* entry points
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*/
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for (check = (union pnp_bios_install_struct *)__va(0xf0000);
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check < (union pnp_bios_install_struct *)__va(0xffff0);
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check = (void *)check + 16) {
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if (check->fields.signature != PNP_SIGNATURE)
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continue;
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printk(KERN_INFO
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"PnPBIOS: Found PnP BIOS installation structure at 0x%p\n",
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check);
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length = check->fields.length;
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if (!length) {
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printk(KERN_ERR
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"PnPBIOS: installation structure is invalid, skipping\n");
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continue;
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}
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for (sum = 0, i = 0; i < length; i++)
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sum += check->chars[i];
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if (sum) {
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printk(KERN_ERR
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"PnPBIOS: installation structure is corrupted, skipping\n");
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continue;
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}
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if (check->fields.version < 0x10) {
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printk(KERN_WARNING
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"PnPBIOS: PnP BIOS version %d.%d is not supported\n",
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check->fields.version >> 4,
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check->fields.version & 15);
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continue;
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}
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printk(KERN_INFO
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"PnPBIOS: PnP BIOS version %d.%d, entry 0x%x:0x%x, dseg 0x%x\n",
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check->fields.version >> 4, check->fields.version & 15,
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check->fields.pm16cseg, check->fields.pm16offset,
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check->fields.pm16dseg);
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pnp_bios_install = check;
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return 1;
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}
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printk(KERN_INFO "PnPBIOS: PnP BIOS support was not detected.\n");
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return 0;
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}
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static int __init exploding_pnp_bios(const struct dmi_system_id *d)
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{
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printk(KERN_WARNING "%s detected. Disabling PnPBIOS\n", d->ident);
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return 0;
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}
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static struct dmi_system_id pnpbios_dmi_table[] __initdata = {
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{ /* PnPBIOS GPF on boot */
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.callback = exploding_pnp_bios,
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.ident = "Higraded P14H",
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.matches = {
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DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
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DMI_MATCH(DMI_BIOS_VERSION, "07.00T"),
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DMI_MATCH(DMI_SYS_VENDOR, "Higraded"),
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DMI_MATCH(DMI_PRODUCT_NAME, "P14H"),
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},
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},
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{ /* PnPBIOS GPF on boot */
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.callback = exploding_pnp_bios,
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.ident = "ASUS P4P800",
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc."),
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DMI_MATCH(DMI_BOARD_NAME, "P4P800"),
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},
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},
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{}
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};
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static int __init pnpbios_init(void)
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{
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int ret;
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if (pnpbios_disabled || dmi_check_system(pnpbios_dmi_table) ||
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arch_pnpbios_disabled()) {
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printk(KERN_INFO "PnPBIOS: Disabled\n");
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return -ENODEV;
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}
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#ifdef CONFIG_PNPACPI
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if (!acpi_disabled && !pnpacpi_disabled) {
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pnpbios_disabled = 1;
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printk(KERN_INFO "PnPBIOS: Disabled by ACPI PNP\n");
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return -ENODEV;
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}
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#endif /* CONFIG_ACPI */
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/* scan the system for pnpbios support */
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if (!pnpbios_probe_system())
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return -ENODEV;
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|
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/* make preparations for bios calls */
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pnpbios_calls_init(pnp_bios_install);
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|
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/* read the node info */
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ret = pnp_bios_dev_node_info(&node_info);
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if (ret) {
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printk(KERN_ERR
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"PnPBIOS: Unable to get node info. Aborting.\n");
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return ret;
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|
}
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|
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|
/* register with the pnp layer */
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ret = pnp_register_protocol(&pnpbios_protocol);
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|
if (ret) {
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|
printk(KERN_ERR
|
|
"PnPBIOS: Unable to register driver. Aborting.\n");
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|
return ret;
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|
}
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|
|
|
/* start the proc interface */
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|
ret = pnpbios_proc_init();
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|
if (ret)
|
|
printk(KERN_ERR "PnPBIOS: Failed to create proc interface.\n");
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|
|
|
/* scan for pnpbios devices */
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|
build_devlist();
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|
|
|
pnp_platform_devices = 1;
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|
return 0;
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|
}
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|
|
|
fs_initcall(pnpbios_init);
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|
|
|
static int __init pnpbios_thread_init(void)
|
|
{
|
|
struct task_struct *task;
|
|
|
|
if (pnpbios_disabled)
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|
return 0;
|
|
|
|
init_completion(&unload_sem);
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|
task = kthread_run(pnp_dock_thread, NULL, "kpnpbiosd");
|
|
if (IS_ERR(task))
|
|
return PTR_ERR(task);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Start the kernel thread later: */
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|
device_initcall(pnpbios_thread_init);
|
|
|
|
EXPORT_SYMBOL(pnpbios_protocol);
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