Adding upstream version 5.10.209.upstream/5.10.209

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

7 files changed, 2385 insertions, 0 deletions

diff --git a/drivers/pnp/pnpbios/Kconfig b/drivers/pnp/pnpbios/Kconfig
new file mode 100644
index 000000000..bcdac269a
--- /dev/null
+++ b/drivers/pnp/pnpbios/Kconfig
@@ -0,0 +1,43 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Plug and Play BIOS configuration
+#
+config PNPBIOS
+	bool "Plug and Play BIOS support"
+	depends on ISA && X86_32
+	default n
+	help
+	  Linux uses the PNPBIOS as defined in "Plug and Play BIOS
+	  Specification Version 1.0A May 5, 1994" to autodetect built-in
+	  mainboard resources (e.g. parallel port resources).
+
+	  Some features (e.g. event notification, docking station information,
+	  ISAPNP services) are not currently implemented.
+
+	  If you would like the kernel to detect and allocate resources to
+	  your mainboard devices (on some systems they are disabled by the
+	  BIOS) say Y here.  Also the PNPBIOS can help prevent resource
+	  conflicts between mainboard devices and other bus devices.
+
+	  Note: ACPI is expected to supersede PNPBIOS some day, currently it
+	  co-exists nicely.  If you have a non-ISA system that supports ACPI,
+	  you probably don't need PNPBIOS support.
+
+config PNPBIOS_PROC_FS
+	bool "Plug and Play BIOS /proc interface"
+	depends on PNPBIOS && PROC_FS
+	help
+	  If you say Y here and to "/proc file system support", you will be
+	  able to directly access the PNPBIOS.  This includes resource
+	  allocation, ESCD, and other PNPBIOS services.  Using this
+	  interface is potentially dangerous because the PNPBIOS driver will
+	  not be notified of any resource changes made by writing directly.
+	  Also some buggy systems will fault when accessing certain features
+	  in the PNPBIOS /proc interface (e.g. "boot" configs).
+
+	  See the latest pcmcia-cs (stand-alone package) for a nice set of
+	  PNPBIOS /proc interface tools (lspnp and setpnp).
+
+	  Unless you are debugging or have other specific reasons, it is
+	  recommended that you say N here.
+
diff --git a/drivers/pnp/pnpbios/Makefile b/drivers/pnp/pnpbios/Makefile
new file mode 100644
index 000000000..a91437c56
--- /dev/null
+++ b/drivers/pnp/pnpbios/Makefile
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for the kernel PNPBIOS driver.
+#
+obj-y := pnp.o
+
+pnp-y := core.o bioscalls.o rsparser.o
+
+pnp-$(CONFIG_PNPBIOS_PROC_FS) += proc.o
diff --git a/drivers/pnp/pnpbios/bioscalls.c b/drivers/pnp/pnpbios/bioscalls.c
new file mode 100644
index 000000000..ba5cfc3db
--- /dev/null
+++ b/drivers/pnp/pnpbios/bioscalls.c
@@ -0,0 +1,491 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * bioscalls.c - the lowlevel layer of the PnPBIOS driver
+ */
+
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/linkage.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/pnp.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/kmod.h>
+#include <linux/completion.h>
+#include <linux/spinlock.h>
+
+#include <asm/page.h>
+#include <asm/desc.h>
+#include <asm/byteorder.h>
+
+#include "pnpbios.h"
+
+__visible struct {
+	u16 offset;
+	u16 segment;
+} pnp_bios_callpoint;
+
+/*
+ * These are some opcodes for a "static asmlinkage"
+ * As this code is *not* executed inside the linux kernel segment, but in a
+ * alias at offset 0, we need a far return that can not be compiled by
+ * default (please, prove me wrong! this is *really* ugly!)
+ * This is the only way to get the bios to return into the kernel code,
+ * because the bios code runs in 16 bit protected mode and therefore can only
+ * return to the caller if the call is within the first 64kB, and the linux
+ * kernel begins at offset 3GB...
+ */
+
+asmlinkage __visible void pnp_bios_callfunc(void);
+
+__asm__(".text			\n"
+	__ALIGN_STR "\n"
+	".globl pnp_bios_callfunc\n"
+	"pnp_bios_callfunc:\n"
+	"	pushl %edx	\n"
+	"	pushl %ecx	\n"
+	"	pushl %ebx	\n"
+	"	pushl %eax	\n"
+	"	lcallw *pnp_bios_callpoint\n"
+	"	addl $16, %esp	\n"
+	"	lret		\n"
+	".previous		\n");
+
+#define Q2_SET_SEL(cpu, selname, address, size) \
+do { \
+	struct desc_struct *gdt = get_cpu_gdt_rw((cpu)); \
+	set_desc_base(&gdt[(selname) >> 3], (u32)(address)); \
+	set_desc_limit(&gdt[(selname) >> 3], (size) - 1); \
+} while(0)
+
+static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092,
+			(unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1);
+
+/*
+ * At some point we want to use this stack frame pointer to unwind
+ * after PnP BIOS oopses.
+ */
+
+__visible u32 pnp_bios_fault_esp;
+__visible u32 pnp_bios_fault_eip;
+__visible u32 pnp_bios_is_utter_crap = 0;
+
+static spinlock_t pnp_bios_lock;
+
+/*
+ * Support Functions
+ */
+
+static inline u16 call_pnp_bios(u16 func, u16 arg1, u16 arg2, u16 arg3,
+				u16 arg4, u16 arg5, u16 arg6, u16 arg7,
+				void *ts1_base, u32 ts1_size,
+				void *ts2_base, u32 ts2_size)
+{
+	unsigned long flags;
+	u16 status;
+	struct desc_struct save_desc_40;
+	int cpu;
+
+	/*
+	 * PnP BIOSes are generally not terribly re-entrant.
+	 * Also, don't rely on them to save everything correctly.
+	 */
+	if (pnp_bios_is_utter_crap)
+		return PNP_FUNCTION_NOT_SUPPORTED;
+
+	cpu = get_cpu();
+	save_desc_40 = get_cpu_gdt_rw(cpu)[0x40 / 8];
+	get_cpu_gdt_rw(cpu)[0x40 / 8] = bad_bios_desc;
+
+	/* On some boxes IRQ's during PnP BIOS calls are deadly.  */
+	spin_lock_irqsave(&pnp_bios_lock, flags);
+
+	/* The lock prevents us bouncing CPU here */
+	if (ts1_size)
+		Q2_SET_SEL(smp_processor_id(), PNP_TS1, ts1_base, ts1_size);
+	if (ts2_size)
+		Q2_SET_SEL(smp_processor_id(), PNP_TS2, ts2_base, ts2_size);
+
+	__asm__ __volatile__("pushl %%ebp\n\t"
+			     "pushl %%edi\n\t"
+			     "pushl %%esi\n\t"
+			     "pushl %%ds\n\t"
+			     "pushl %%es\n\t"
+			     "pushl %%fs\n\t"
+			     "pushl %%gs\n\t"
+			     "pushfl\n\t"
+			     "movl %%esp, pnp_bios_fault_esp\n\t"
+			     "movl $1f, pnp_bios_fault_eip\n\t"
+			     "lcall %5,%6\n\t"
+			     "1:popfl\n\t"
+			     "popl %%gs\n\t"
+			     "popl %%fs\n\t"
+			     "popl %%es\n\t"
+			     "popl %%ds\n\t"
+			     "popl %%esi\n\t"
+			     "popl %%edi\n\t"
+			     "popl %%ebp\n\t":"=a"(status)
+			     :"0"((func) | (((u32) arg1) << 16)),
+			     "b"((arg2) | (((u32) arg3) << 16)),
+			     "c"((arg4) | (((u32) arg5) << 16)),
+			     "d"((arg6) | (((u32) arg7) << 16)),
+			     "i"(PNP_CS32), "i"(0)
+			     :"memory");
+	spin_unlock_irqrestore(&pnp_bios_lock, flags);
+
+	get_cpu_gdt_rw(cpu)[0x40 / 8] = save_desc_40;
+	put_cpu();
+
+	/* If we get here and this is set then the PnP BIOS faulted on us. */
+	if (pnp_bios_is_utter_crap) {
+		printk(KERN_ERR
+		       "PnPBIOS: Warning! Your PnP BIOS caused a fatal error. Attempting to continue\n");
+		printk(KERN_ERR
+		       "PnPBIOS: You may need to reboot with the \"pnpbios=off\" option to operate stably\n");
+		printk(KERN_ERR
+		       "PnPBIOS: Check with your vendor for an updated BIOS\n");
+	}
+
+	return status;
+}
+
+void pnpbios_print_status(const char *module, u16 status)
+{
+	switch (status) {
+	case PNP_SUCCESS:
+		printk(KERN_ERR "PnPBIOS: %s: function successful\n", module);
+		break;
+	case PNP_NOT_SET_STATICALLY:
+		printk(KERN_ERR "PnPBIOS: %s: unable to set static resources\n",
+		       module);
+		break;
+	case PNP_UNKNOWN_FUNCTION:
+		printk(KERN_ERR "PnPBIOS: %s: invalid function number passed\n",
+		       module);
+		break;
+	case PNP_FUNCTION_NOT_SUPPORTED:
+		printk(KERN_ERR
+		       "PnPBIOS: %s: function not supported on this system\n",
+		       module);
+		break;
+	case PNP_INVALID_HANDLE:
+		printk(KERN_ERR "PnPBIOS: %s: invalid handle\n", module);
+		break;
+	case PNP_BAD_PARAMETER:
+		printk(KERN_ERR "PnPBIOS: %s: invalid parameters were passed\n",
+		       module);
+		break;
+	case PNP_SET_FAILED:
+		printk(KERN_ERR "PnPBIOS: %s: unable to set resources\n",
+		       module);
+		break;
+	case PNP_EVENTS_NOT_PENDING:
+		printk(KERN_ERR "PnPBIOS: %s: no events are pending\n", module);
+		break;
+	case PNP_SYSTEM_NOT_DOCKED:
+		printk(KERN_ERR "PnPBIOS: %s: the system is not docked\n",
+		       module);
+		break;
+	case PNP_NO_ISA_PNP_CARDS:
+		printk(KERN_ERR
+		       "PnPBIOS: %s: no isapnp cards are installed on this system\n",
+		       module);
+		break;
+	case PNP_UNABLE_TO_DETERMINE_DOCK_CAPABILITIES:
+		printk(KERN_ERR
+		       "PnPBIOS: %s: cannot determine the capabilities of the docking station\n",
+		       module);
+		break;
+	case PNP_CONFIG_CHANGE_FAILED_NO_BATTERY:
+		printk(KERN_ERR
+		       "PnPBIOS: %s: unable to undock, the system does not have a battery\n",
+		       module);
+		break;
+	case PNP_CONFIG_CHANGE_FAILED_RESOURCE_CONFLICT:
+		printk(KERN_ERR
+		       "PnPBIOS: %s: could not dock due to resource conflicts\n",
+		       module);
+		break;
+	case PNP_BUFFER_TOO_SMALL:
+		printk(KERN_ERR "PnPBIOS: %s: the buffer passed is too small\n",
+		       module);
+		break;
+	case PNP_USE_ESCD_SUPPORT:
+		printk(KERN_ERR "PnPBIOS: %s: use ESCD instead\n", module);
+		break;
+	case PNP_MESSAGE_NOT_SUPPORTED:
+		printk(KERN_ERR "PnPBIOS: %s: the message is unsupported\n",
+		       module);
+		break;
+	case PNP_HARDWARE_ERROR:
+		printk(KERN_ERR "PnPBIOS: %s: a hardware failure has occurred\n",
+		       module);
+		break;
+	default:
+		printk(KERN_ERR "PnPBIOS: %s: unexpected status 0x%x\n", module,
+		       status);
+		break;
+	}
+}
+
+/*
+ * PnP BIOS Low Level Calls
+ */
+
+#define PNP_GET_NUM_SYS_DEV_NODES		0x00
+#define PNP_GET_SYS_DEV_NODE			0x01
+#define PNP_SET_SYS_DEV_NODE			0x02
+#define PNP_GET_EVENT				0x03
+#define PNP_SEND_MESSAGE			0x04
+#define PNP_GET_DOCKING_STATION_INFORMATION	0x05
+#define PNP_SET_STATIC_ALLOCED_RES_INFO		0x09
+#define PNP_GET_STATIC_ALLOCED_RES_INFO		0x0a
+#define PNP_GET_APM_ID_TABLE			0x0b
+#define PNP_GET_PNP_ISA_CONFIG_STRUC		0x40
+#define PNP_GET_ESCD_INFO			0x41
+#define PNP_READ_ESCD				0x42
+#define PNP_WRITE_ESCD				0x43
+
+/*
+ * Call PnP BIOS with function 0x00, "get number of system device nodes"
+ */
+static int __pnp_bios_dev_node_info(struct pnp_dev_node_info *data)
+{
+	u16 status;
+
+	if (!pnp_bios_present())
+		return PNP_FUNCTION_NOT_SUPPORTED;
+	status = call_pnp_bios(PNP_GET_NUM_SYS_DEV_NODES, 0, PNP_TS1, 2,
+			       PNP_TS1, PNP_DS, 0, 0, data,
+			       sizeof(struct pnp_dev_node_info), NULL, 0);
+	data->no_nodes &= 0xff;
+	return status;
+}
+
+int pnp_bios_dev_node_info(struct pnp_dev_node_info *data)
+{
+	int status = __pnp_bios_dev_node_info(data);
+
+	if (status)
+		pnpbios_print_status("dev_node_info", status);
+	return status;
+}
+
+/*
+ * Note that some PnP BIOSes (e.g., on Sony Vaio laptops) die a horrible
+ * death if they are asked to access the "current" configuration.
+ * Therefore, if it's a matter of indifference, it's better to call
+ * get_dev_node() and set_dev_node() with boot=1 rather than with boot=0.
+ */
+
+/* 
+ * Call PnP BIOS with function 0x01, "get system device node"
+ * Input: *nodenum = desired node,
+ *        boot = whether to get nonvolatile boot (!=0)
+ *               or volatile current (0) config
+ * Output: *nodenum=next node or 0xff if no more nodes
+ */
+static int __pnp_bios_get_dev_node(u8 *nodenum, char boot,
+				   struct pnp_bios_node *data)
+{
+	u16 status;
+	u16 tmp_nodenum;
+
+	if (!pnp_bios_present())
+		return PNP_FUNCTION_NOT_SUPPORTED;
+	if (!boot && pnpbios_dont_use_current_config)
+		return PNP_FUNCTION_NOT_SUPPORTED;
+	tmp_nodenum = *nodenum;
+	status = call_pnp_bios(PNP_GET_SYS_DEV_NODE, 0, PNP_TS1, 0, PNP_TS2,
+			       boot ? 2 : 1, PNP_DS, 0, &tmp_nodenum,
+			       sizeof(tmp_nodenum), data, 65536);
+	*nodenum = tmp_nodenum;
+	return status;
+}
+
+int pnp_bios_get_dev_node(u8 *nodenum, char boot, struct pnp_bios_node *data)
+{
+	int status;
+
+	status = __pnp_bios_get_dev_node(nodenum, boot, data);
+	if (status)
+		pnpbios_print_status("get_dev_node", status);
+	return status;
+}
+
+/*
+ * Call PnP BIOS with function 0x02, "set system device node"
+ * Input: *nodenum = desired node, 
+ *        boot = whether to set nonvolatile boot (!=0)
+ *               or volatile current (0) config
+ */
+static int __pnp_bios_set_dev_node(u8 nodenum, char boot,
+				   struct pnp_bios_node *data)
+{
+	u16 status;
+
+	if (!pnp_bios_present())
+		return PNP_FUNCTION_NOT_SUPPORTED;
+	if (!boot && pnpbios_dont_use_current_config)
+		return PNP_FUNCTION_NOT_SUPPORTED;
+	status = call_pnp_bios(PNP_SET_SYS_DEV_NODE, nodenum, 0, PNP_TS1,
+			       boot ? 2 : 1, PNP_DS, 0, 0, data, 65536, NULL,
+			       0);
+	return status;
+}
+
+int pnp_bios_set_dev_node(u8 nodenum, char boot, struct pnp_bios_node *data)
+{
+	int status;
+
+	status = __pnp_bios_set_dev_node(nodenum, boot, data);
+	if (status) {
+		pnpbios_print_status("set_dev_node", status);
+		return status;
+	}
+	if (!boot) {		/* Update devlist */
+		status = pnp_bios_get_dev_node(&nodenum, boot, data);
+		if (status)
+			return status;
+	}
+	return status;
+}
+
+/*
+ * Call PnP BIOS with function 0x05, "get docking station information"
+ */
+int pnp_bios_dock_station_info(struct pnp_docking_station_info *data)
+{
+	u16 status;
+
+	if (!pnp_bios_present())
+		return PNP_FUNCTION_NOT_SUPPORTED;
+	status = call_pnp_bios(PNP_GET_DOCKING_STATION_INFORMATION, 0, PNP_TS1,
+			       PNP_DS, 0, 0, 0, 0, data,
+			       sizeof(struct pnp_docking_station_info), NULL,
+			       0);
+	return status;
+}
+
+/*
+ * Call PnP BIOS with function 0x0a, "get statically allocated resource
+ * information"
+ */
+static int __pnp_bios_get_stat_res(char *info)
+{
+	u16 status;
+
+	if (!pnp_bios_present())
+		return PNP_FUNCTION_NOT_SUPPORTED;
+	status = call_pnp_bios(PNP_GET_STATIC_ALLOCED_RES_INFO, 0, PNP_TS1,
+			       PNP_DS, 0, 0, 0, 0, info, 65536, NULL, 0);
+	return status;
+}
+
+int pnp_bios_get_stat_res(char *info)
+{
+	int status;
+
+	status = __pnp_bios_get_stat_res(info);
+	if (status)
+		pnpbios_print_status("get_stat_res", status);
+	return status;
+}
+
+/*
+ * Call PnP BIOS with function 0x40, "get isa pnp configuration structure"
+ */
+static int __pnp_bios_isapnp_config(struct pnp_isa_config_struc *data)
+{
+	u16 status;
+
+	if (!pnp_bios_present())
+		return PNP_FUNCTION_NOT_SUPPORTED;
+	status = call_pnp_bios(PNP_GET_PNP_ISA_CONFIG_STRUC, 0, PNP_TS1, PNP_DS,
+			       0, 0, 0, 0, data,
+			       sizeof(struct pnp_isa_config_struc), NULL, 0);
+	return status;
+}
+
+int pnp_bios_isapnp_config(struct pnp_isa_config_struc *data)
+{
+	int status;
+
+	status = __pnp_bios_isapnp_config(data);
+	if (status)
+		pnpbios_print_status("isapnp_config", status);
+	return status;
+}
+
+/*
+ * Call PnP BIOS with function 0x41, "get ESCD info"
+ */
+static int __pnp_bios_escd_info(struct escd_info_struc *data)
+{
+	u16 status;
+
+	if (!pnp_bios_present())
+		return ESCD_FUNCTION_NOT_SUPPORTED;
+	status = call_pnp_bios(PNP_GET_ESCD_INFO, 0, PNP_TS1, 2, PNP_TS1, 4,
+			       PNP_TS1, PNP_DS, data,
+			       sizeof(struct escd_info_struc), NULL, 0);
+	return status;
+}
+
+int pnp_bios_escd_info(struct escd_info_struc *data)
+{
+	int status;
+
+	status = __pnp_bios_escd_info(data);
+	if (status)
+		pnpbios_print_status("escd_info", status);
+	return status;
+}
+
+/*
+ * Call PnP BIOS function 0x42, "read ESCD"
+ * nvram_base is determined by calling escd_info
+ */
+static int __pnp_bios_read_escd(char *data, u32 nvram_base)
+{
+	u16 status;
+
+	if (!pnp_bios_present())
+		return ESCD_FUNCTION_NOT_SUPPORTED;
+	status = call_pnp_bios(PNP_READ_ESCD, 0, PNP_TS1, PNP_TS2, PNP_DS, 0, 0,
+			       0, data, 65536, __va(nvram_base), 65536);
+	return status;
+}
+
+int pnp_bios_read_escd(char *data, u32 nvram_base)
+{
+	int status;
+
+	status = __pnp_bios_read_escd(data, nvram_base);
+	if (status)
+		pnpbios_print_status("read_escd", status);
+	return status;
+}
+
+void pnpbios_calls_init(union pnp_bios_install_struct *header)
+{
+	int i;
+
+	spin_lock_init(&pnp_bios_lock);
+	pnp_bios_callpoint.offset = header->fields.pm16offset;
+	pnp_bios_callpoint.segment = PNP_CS16;
+
+	for_each_possible_cpu(i) {
+		struct desc_struct *gdt = get_cpu_gdt_rw(i);
+		if (!gdt)
+			continue;
+		set_desc_base(&gdt[GDT_ENTRY_PNPBIOS_CS32],
+			 (unsigned long)&pnp_bios_callfunc);
+		set_desc_base(&gdt[GDT_ENTRY_PNPBIOS_CS16],
+			 (unsigned long)__va(header->fields.pm16cseg));
+		set_desc_base(&gdt[GDT_ENTRY_PNPBIOS_DS],
+			 (unsigned long)__va(header->fields.pm16dseg));
+	}
+}
diff --git a/drivers/pnp/pnpbios/core.c b/drivers/pnp/pnpbios/core.c
new file mode 100644
index 000000000..9b760e73e
--- /dev/null
+++ b/drivers/pnp/pnpbios/core.c
@@ -0,0 +1,577 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * pnpbios -- PnP BIOS driver
+ *
+ * This driver provides access to Plug-'n'-Play services provided by
+ * the PnP BIOS firmware, described in the following documents:
+ *   Plug and Play BIOS Specification, Version 1.0A, 5 May 1994
+ *   Plug and Play BIOS Clarification Paper, 6 October 1994
+ *     Compaq Computer Corporation, Phoenix Technologies Ltd., Intel Corp.
+ * 
+ * Originally (C) 1998 Christian Schmidt <schmidt@digadd.de>
+ * Modifications (C) 1998 Tom Lees <tom@lpsg.demon.co.uk>
+ * Minor reorganizations by David Hinds <dahinds@users.sourceforge.net>
+ * Further modifications (C) 2001, 2002 by:
+ *   Alan Cox <alan@redhat.com>
+ *   Thomas Hood
+ *   Brian Gerst <bgerst@didntduck.org>
+ *
+ * Ported to the PnP Layer and several additional improvements (C) 2002
+ * by Adam Belay <ambx1@neo.rr.com>
+ */
+
+/* Change Log
+ *
+ * Adam Belay - <ambx1@neo.rr.com> - March 16, 2003
+ * rev 1.01	Only call pnp_bios_dev_node_info once
+ *		Added pnpbios_print_status
+ *		Added several new error messages and info messages
+ *		Added pnpbios_interface_attach_device
+ *		integrated core and proc init system
+ *		Introduced PNPMODE flags
+ *		Removed some useless includes
+ */
+
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/linkage.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/pnp.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/slab.h>
+#include <linux/completion.h>
+#include <linux/spinlock.h>
+#include <linux/dmi.h>
+#include <linux/delay.h>
+#include <linux/acpi.h>
+#include <linux/freezer.h>
+#include <linux/kmod.h>
+#include <linux/kthread.h>
+
+#include <asm/page.h>
+#include <asm/desc.h>
+#include <asm/byteorder.h>
+
+#include "../base.h"
+#include "pnpbios.h"
+
+/*
+ *
+ * PnP BIOS INTERFACE
+ *
+ */
+
+static union pnp_bios_install_struct *pnp_bios_install = NULL;
+
+int pnp_bios_present(void)
+{
+	return (pnp_bios_install != NULL);
+}
+
+struct pnp_dev_node_info node_info;
+
+/*
+ *
+ * DOCKING FUNCTIONS
+ *
+ */
+
+static struct completion unload_sem;
+
+/*
+ * (Much of this belongs in a shared routine somewhere)
+ */
+static int pnp_dock_event(int dock, struct pnp_docking_station_info *info)
+{
+	static char const sbin_pnpbios[] = "/sbin/pnpbios";
+	char *argv[3], **envp, *buf, *scratch;
+	int i = 0, value;
+
+	if (!(envp = kcalloc(20, sizeof(char *), GFP_KERNEL)))
+		return -ENOMEM;
+	if (!(buf = kzalloc(256, GFP_KERNEL))) {
+		kfree(envp);
+		return -ENOMEM;
+	}
+
+	/* FIXME: if there are actual users of this, it should be
+	 * integrated into the driver core and use the usual infrastructure
+	 * like sysfs and uevents
+	 */
+	argv[0] = (char *)sbin_pnpbios;
+	argv[1] = "dock";
+	argv[2] = NULL;
+
+	/* minimal command environment */
+	envp[i++] = "HOME=/";
+	envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
+
+#ifdef	DEBUG
+	/* hint that policy agent should enter no-stdout debug mode */
+	envp[i++] = "DEBUG=kernel";
+#endif
+	/* extensible set of named bus-specific parameters,
+	 * supporting multiple driver selection algorithms.
+	 */
+	scratch = buf;
+
+	/* action:  add, remove */
+	envp[i++] = scratch;
+	scratch += sprintf(scratch, "ACTION=%s", dock ? "add" : "remove") + 1;
+
+	/* Report the ident for the dock */
+	envp[i++] = scratch;
+	scratch += sprintf(scratch, "DOCK=%x/%x/%x",
+			   info->location_id, info->serial, info->capabilities);
+	envp[i] = NULL;
+
+	value = call_usermodehelper(sbin_pnpbios, argv, envp, UMH_WAIT_EXEC);
+	kfree(buf);
+	kfree(envp);
+	return 0;
+}
+
+/*
+ * Poll the PnP docking at regular intervals
+ */
+static int pnp_dock_thread(void *unused)
+{
+	static struct pnp_docking_station_info now;
+	int docked = -1, d = 0;
+
+	set_freezable();
+	while (1) {
+		int status;
+
+		/*
+		 * Poll every 2 seconds
+		 */
+		msleep_interruptible(2000);
+
+		if (try_to_freeze())
+			continue;
+
+		status = pnp_bios_dock_station_info(&now);
+
+		switch (status) {
+			/*
+			 * No dock to manage
+			 */
+		case PNP_FUNCTION_NOT_SUPPORTED:
+			complete_and_exit(&unload_sem, 0);
+		case PNP_SYSTEM_NOT_DOCKED:
+			d = 0;
+			break;
+		case PNP_SUCCESS:
+			d = 1;
+			break;
+		default:
+			pnpbios_print_status("pnp_dock_thread", status);
+			printk(KERN_WARNING "PnPBIOS: disabling dock monitoring.\n");
+			complete_and_exit(&unload_sem, 0);
+		}
+		if (d != docked) {
+			if (pnp_dock_event(d, &now) == 0) {
+				docked = d;
+#if 0
+				printk(KERN_INFO
+				       "PnPBIOS: Docking station %stached\n",
+				       docked ? "at" : "de");
+#endif
+			}
+		}
+	}
+	complete_and_exit(&unload_sem, 0);
+}
+
+static int pnpbios_get_resources(struct pnp_dev *dev)
+{
+	u8 nodenum = dev->number;
+	struct pnp_bios_node *node;
+
+	if (!pnpbios_is_dynamic(dev))
+		return -EPERM;
+
+	pnp_dbg(&dev->dev, "get resources\n");
+	node = kzalloc(node_info.max_node_size, GFP_KERNEL);
+	if (!node)
+		return -1;
+	if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) {
+		kfree(node);
+		return -ENODEV;
+	}
+	pnpbios_read_resources_from_node(dev, node);
+	dev->active = pnp_is_active(dev);
+	kfree(node);
+	return 0;
+}
+
+static int pnpbios_set_resources(struct pnp_dev *dev)
+{
+	u8 nodenum = dev->number;
+	struct pnp_bios_node *node;
+	int ret;
+
+	if (!pnpbios_is_dynamic(dev))
+		return -EPERM;
+
+	pnp_dbg(&dev->dev, "set resources\n");
+	node = kzalloc(node_info.max_node_size, GFP_KERNEL);
+	if (!node)
+		return -1;
+	if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) {
+		kfree(node);
+		return -ENODEV;
+	}
+	if (pnpbios_write_resources_to_node(dev, node) < 0) {
+		kfree(node);
+		return -1;
+	}
+	ret = pnp_bios_set_dev_node(node->handle, (char)PNPMODE_DYNAMIC, node);
+	kfree(node);
+	if (ret > 0)
+		ret = -1;
+	return ret;
+}
+
+static void pnpbios_zero_data_stream(struct pnp_bios_node *node)
+{
+	unsigned char *p = (char *)node->data;
+	unsigned char *end = (char *)(node->data + node->size);
+	unsigned int len;
+	int i;
+
+	while ((char *)p < (char *)end) {
+		if (p[0] & 0x80) {	/* large tag */
+			len = (p[2] << 8) | p[1];
+			p += 3;
+		} else {
+			if (((p[0] >> 3) & 0x0f) == 0x0f)
+				return;
+			len = p[0] & 0x07;
+			p += 1;
+		}
+		for (i = 0; i < len; i++)
+			p[i] = 0;
+		p += len;
+	}
+	printk(KERN_ERR
+	       "PnPBIOS: Resource structure did not contain an end tag.\n");
+}
+
+static int pnpbios_disable_resources(struct pnp_dev *dev)
+{
+	struct pnp_bios_node *node;
+	u8 nodenum = dev->number;
+	int ret;
+
+	if (dev->flags & PNPBIOS_NO_DISABLE || !pnpbios_is_dynamic(dev))
+		return -EPERM;
+
+	node = kzalloc(node_info.max_node_size, GFP_KERNEL);
+	if (!node)
+		return -ENOMEM;
+
+	if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) {
+		kfree(node);
+		return -ENODEV;
+	}
+	pnpbios_zero_data_stream(node);
+
+	ret = pnp_bios_set_dev_node(dev->number, (char)PNPMODE_DYNAMIC, node);
+	kfree(node);
+	if (ret > 0)
+		ret = -1;
+	return ret;
+}
+
+/* PnP Layer support */
+
+struct pnp_protocol pnpbios_protocol = {
+	.name = "Plug and Play BIOS",
+	.get = pnpbios_get_resources,
+	.set = pnpbios_set_resources,
+	.disable = pnpbios_disable_resources,
+};
+
+static int __init insert_device(struct pnp_bios_node *node)
+{
+	struct list_head *pos;
+	struct pnp_dev *dev;
+	char id[8];
+	int error;
+
+	/* check if the device is already added */
+	list_for_each(pos, &pnpbios_protocol.devices) {
+		dev = list_entry(pos, struct pnp_dev, protocol_list);
+		if (dev->number == node->handle)
+			return -EEXIST;
+	}
+
+	pnp_eisa_id_to_string(node->eisa_id & PNP_EISA_ID_MASK, id);
+	dev = pnp_alloc_dev(&pnpbios_protocol, node->handle, id);
+	if (!dev)
+		return -ENOMEM;
+
+	pnpbios_parse_data_stream(dev, node);
+	dev->active = pnp_is_active(dev);
+	dev->flags = node->flags;
+	if (!(dev->flags & PNPBIOS_NO_CONFIG))
+		dev->capabilities |= PNP_CONFIGURABLE;
+	if (!(dev->flags & PNPBIOS_NO_DISABLE) && pnpbios_is_dynamic(dev))
+		dev->capabilities |= PNP_DISABLE;
+	dev->capabilities |= PNP_READ;
+	if (pnpbios_is_dynamic(dev))
+		dev->capabilities |= PNP_WRITE;
+	if (dev->flags & PNPBIOS_REMOVABLE)
+		dev->capabilities |= PNP_REMOVABLE;
+
+	/* clear out the damaged flags */
+	if (!dev->active)
+		pnp_init_resources(dev);
+
+	error = pnp_add_device(dev);
+	if (error) {
+		put_device(&dev->dev);
+		return error;
+	}
+
+	pnpbios_interface_attach_device(node);
+
+	return 0;
+}
+
+static void __init build_devlist(void)
+{
+	u8 nodenum;
+	unsigned int nodes_got = 0;
+	unsigned int devs = 0;
+	struct pnp_bios_node *node;
+
+	node = kzalloc(node_info.max_node_size, GFP_KERNEL);
+	if (!node)
+		return;
+
+	for (nodenum = 0; nodenum < 0xff;) {
+		u8 thisnodenum = nodenum;
+		/* eventually we will want to use PNPMODE_STATIC here but for now
+		 * dynamic will help us catch buggy bioses to add to the blacklist.
+		 */
+		if (!pnpbios_dont_use_current_config) {
+			if (pnp_bios_get_dev_node
+			    (&nodenum, (char)PNPMODE_DYNAMIC, node))
+				break;
+		} else {
+			if (pnp_bios_get_dev_node
+			    (&nodenum, (char)PNPMODE_STATIC, node))
+				break;
+		}
+		nodes_got++;
+		if (insert_device(node) == 0)
+			devs++;
+		if (nodenum <= thisnodenum) {
+			printk(KERN_ERR
+			       "PnPBIOS: build_devlist: Node number 0x%x is out of sequence following node 0x%x. Aborting.\n",
+			       (unsigned int)nodenum,
+			       (unsigned int)thisnodenum);
+			break;
+		}
+	}
+	kfree(node);
+
+	printk(KERN_INFO
+	       "PnPBIOS: %i node%s reported by PnP BIOS; %i recorded by driver\n",
+	       nodes_got, nodes_got != 1 ? "s" : "", devs);
+}
+
+/*
+ *
+ * INIT AND EXIT
+ *
+ */
+
+static int pnpbios_disabled;
+int pnpbios_dont_use_current_config;
+
+static int __init pnpbios_setup(char *str)
+{
+	int invert;
+
+	while ((str != NULL) && (*str != '\0')) {
+		if (strncmp(str, "off", 3) == 0)
+			pnpbios_disabled = 1;
+		if (strncmp(str, "on", 2) == 0)
+			pnpbios_disabled = 0;
+		invert = (strncmp(str, "no-", 3) == 0);
+		if (invert)
+			str += 3;
+		if (strncmp(str, "curr", 4) == 0)
+			pnpbios_dont_use_current_config = invert;
+		str = strchr(str, ',');
+		if (str != NULL)
+			str += strspn(str, ", \t");
+	}
+
+	return 1;
+}
+
+__setup("pnpbios=", pnpbios_setup);
+
+/* PnP BIOS signature: "$PnP" */
+#define PNP_SIGNATURE   (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24))
+
+static int __init pnpbios_probe_system(void)
+{
+	union pnp_bios_install_struct *check;
+	u8 sum;
+	int length, i;
+
+	printk(KERN_INFO "PnPBIOS: Scanning system for PnP BIOS support...\n");
+
+	/*
+	 * Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS
+	 * structure and, if one is found, sets up the selectors and
+	 * entry points
+	 */
+	for (check = (union pnp_bios_install_struct *)__va(0xf0000);
+	     check < (union pnp_bios_install_struct *)__va(0xffff0);
+	     check = (void *)check + 16) {
+		if (check->fields.signature != PNP_SIGNATURE)
+			continue;
+		printk(KERN_INFO
+		       "PnPBIOS: Found PnP BIOS installation structure at 0x%p\n",
+		       check);
+		length = check->fields.length;
+		if (!length) {
+			printk(KERN_ERR
+			       "PnPBIOS: installation structure is invalid, skipping\n");
+			continue;
+		}
+		for (sum = 0, i = 0; i < length; i++)
+			sum += check->chars[i];
+		if (sum) {
+			printk(KERN_ERR
+			       "PnPBIOS: installation structure is corrupted, skipping\n");
+			continue;
+		}
+		if (check->fields.version < 0x10) {
+			printk(KERN_WARNING
+			       "PnPBIOS: PnP BIOS version %d.%d is not supported\n",
+			       check->fields.version >> 4,
+			       check->fields.version & 15);
+			continue;
+		}
+		printk(KERN_INFO
+		       "PnPBIOS: PnP BIOS version %d.%d, entry 0x%x:0x%x, dseg 0x%x\n",
+		       check->fields.version >> 4, check->fields.version & 15,
+		       check->fields.pm16cseg, check->fields.pm16offset,
+		       check->fields.pm16dseg);
+		pnp_bios_install = check;
+		return 1;
+	}
+
+	printk(KERN_INFO "PnPBIOS: PnP BIOS support was not detected.\n");
+	return 0;
+}
+
+static int __init exploding_pnp_bios(const struct dmi_system_id *d)
+{
+	printk(KERN_WARNING "%s detected. Disabling PnPBIOS\n", d->ident);
+	return 0;
+}
+
+static const struct dmi_system_id pnpbios_dmi_table[] __initconst = {
+	{			/* PnPBIOS GPF on boot */
+	 .callback = exploding_pnp_bios,
+	 .ident = "Higraded P14H",
+	 .matches = {
+		     DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
+		     DMI_MATCH(DMI_BIOS_VERSION, "07.00T"),
+		     DMI_MATCH(DMI_SYS_VENDOR, "Higraded"),
+		     DMI_MATCH(DMI_PRODUCT_NAME, "P14H"),
+		     },
+	 },
+	{			/* PnPBIOS GPF on boot */
+	 .callback = exploding_pnp_bios,
+	 .ident = "ASUS P4P800",
+	 .matches = {
+		     DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc."),
+		     DMI_MATCH(DMI_BOARD_NAME, "P4P800"),
+		     },
+	 },
+	{}
+};
+
+static int __init pnpbios_init(void)
+{
+	int ret;
+
+	if (pnpbios_disabled || dmi_check_system(pnpbios_dmi_table) ||
+	    arch_pnpbios_disabled()) {
+		printk(KERN_INFO "PnPBIOS: Disabled\n");
+		return -ENODEV;
+	}
+
+#ifdef CONFIG_PNPACPI
+	if (!acpi_disabled && !pnpacpi_disabled) {
+		pnpbios_disabled = 1;
+		printk(KERN_INFO "PnPBIOS: Disabled by ACPI PNP\n");
+		return -ENODEV;
+	}
+#endif				/* CONFIG_ACPI */
+
+	/* scan the system for pnpbios support */
+	if (!pnpbios_probe_system())
+		return -ENODEV;
+
+	/* make preparations for bios calls */
+	pnpbios_calls_init(pnp_bios_install);
+
+	/* read the node info */
+	ret = pnp_bios_dev_node_info(&node_info);
+	if (ret) {
+		printk(KERN_ERR
+		       "PnPBIOS: Unable to get node info.  Aborting.\n");
+		return ret;
+	}
+
+	/* register with the pnp layer */
+	ret = pnp_register_protocol(&pnpbios_protocol);
+	if (ret) {
+		printk(KERN_ERR
+		       "PnPBIOS: Unable to register driver.  Aborting.\n");
+		return ret;
+	}
+
+	/* start the proc interface */
+	ret = pnpbios_proc_init();
+	if (ret)
+		printk(KERN_ERR "PnPBIOS: Failed to create proc interface.\n");
+
+	/* scan for pnpbios devices */
+	build_devlist();
+
+	pnp_platform_devices = 1;
+	return 0;
+}
+
+fs_initcall(pnpbios_init);
+
+static int __init pnpbios_thread_init(void)
+{
+	struct task_struct *task;
+
+	if (pnpbios_disabled)
+		return 0;
+
+	init_completion(&unload_sem);
+	task = kthread_run(pnp_dock_thread, NULL, "kpnpbiosd");
+	return PTR_ERR_OR_ZERO(task);
+}
+
+/* Start the kernel thread later: */
+device_initcall(pnpbios_thread_init);
+
+EXPORT_SYMBOL(pnpbios_protocol);
diff --git a/drivers/pnp/pnpbios/pnpbios.h b/drivers/pnp/pnpbios/pnpbios.h
new file mode 100644
index 000000000..2ce739ff9
--- /dev/null
+++ b/drivers/pnp/pnpbios/pnpbios.h
@@ -0,0 +1,169 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * pnpbios.h - contains local definitions
+ */
+
+/*
+ * Include file for the interface to a PnP BIOS
+ *
+ * Original BIOS code (C) 1998 Christian Schmidt (chr.schmidt@tu-bs.de)
+ * PnP handler parts (c) 1998 Tom Lees <tom@lpsg.demon.co.uk>
+ * Minor reorganizations by David Hinds <dahinds@users.sourceforge.net>
+ */
+
+/*
+ * Return codes
+ */
+#define PNP_SUCCESS                     0x00
+#define PNP_NOT_SET_STATICALLY          0x7f
+#define PNP_UNKNOWN_FUNCTION            0x81
+#define PNP_FUNCTION_NOT_SUPPORTED      0x82
+#define PNP_INVALID_HANDLE              0x83
+#define PNP_BAD_PARAMETER               0x84
+#define PNP_SET_FAILED                  0x85
+#define PNP_EVENTS_NOT_PENDING          0x86
+#define PNP_SYSTEM_NOT_DOCKED           0x87
+#define PNP_NO_ISA_PNP_CARDS            0x88
+#define PNP_UNABLE_TO_DETERMINE_DOCK_CAPABILITIES 0x89
+#define PNP_CONFIG_CHANGE_FAILED_NO_BATTERY 0x8a
+#define PNP_CONFIG_CHANGE_FAILED_RESOURCE_CONFLICT 0x8b
+#define PNP_BUFFER_TOO_SMALL            0x8c
+#define PNP_USE_ESCD_SUPPORT            0x8d
+#define PNP_MESSAGE_NOT_SUPPORTED       0x8e
+#define PNP_HARDWARE_ERROR              0x8f
+
+#define ESCD_SUCCESS                    0x00
+#define ESCD_IO_ERROR_READING           0x55
+#define ESCD_INVALID                    0x56
+#define ESCD_BUFFER_TOO_SMALL           0x59
+#define ESCD_NVRAM_TOO_SMALL            0x5a
+#define ESCD_FUNCTION_NOT_SUPPORTED     0x81
+
+/*
+ * Events that can be received by "get event"
+ */
+#define PNPEV_ABOUT_TO_CHANGE_CONFIG	0x0001
+#define PNPEV_DOCK_CHANGED		0x0002
+#define PNPEV_SYSTEM_DEVICE_CHANGED	0x0003
+#define PNPEV_CONFIG_CHANGED_FAILED	0x0004
+#define PNPEV_UNKNOWN_SYSTEM_EVENT	0xffff
+/* 0x8000 through 0xfffe are OEM defined */
+
+/*
+ * Messages that should be sent through "send message"
+ */
+#define PNPMSG_OK			0x00
+#define PNPMSG_ABORT			0x01
+#define PNPMSG_UNDOCK_DEFAULT_ACTION	0x40
+#define PNPMSG_POWER_OFF		0x41
+#define PNPMSG_PNP_OS_ACTIVE		0x42
+#define PNPMSG_PNP_OS_INACTIVE		0x43
+
+/*
+ * Plug and Play BIOS flags
+ */
+#define PNPBIOS_NO_DISABLE		0x0001
+#define PNPBIOS_NO_CONFIG		0x0002
+#define PNPBIOS_OUTPUT			0x0004
+#define PNPBIOS_INPUT			0x0008
+#define PNPBIOS_BOOTABLE		0x0010
+#define PNPBIOS_DOCK			0x0020
+#define PNPBIOS_REMOVABLE		0x0040
+#define pnpbios_is_static(x) (((x)->flags & 0x0100) == 0x0000)
+#define pnpbios_is_dynamic(x) ((x)->flags & 0x0080)
+
+/*
+ * Function Parameters
+ */
+#define PNPMODE_STATIC 1
+#define PNPMODE_DYNAMIC 0
+
+/* 0x8000 through 0xffff are OEM defined */
+
+#pragma pack(1)
+struct pnp_dev_node_info {
+	__u16 no_nodes;
+	__u16 max_node_size;
+};
+struct pnp_docking_station_info {
+	__u32 location_id;
+	__u32 serial;
+	__u16 capabilities;
+};
+struct pnp_isa_config_struc {
+	__u8 revision;
+	__u8 no_csns;
+	__u16 isa_rd_data_port;
+	__u16 reserved;
+};
+struct escd_info_struc {
+	__u16 min_escd_write_size;
+	__u16 escd_size;
+	__u32 nv_storage_base;
+};
+struct pnp_bios_node {
+	__u16 size;
+	__u8 handle;
+	__u32 eisa_id;
+	__u8 type_code[3];
+	__u16 flags;
+	__u8 data[];
+};
+#pragma pack()
+
+/* non-exported */
+extern struct pnp_dev_node_info node_info;
+
+extern int pnp_bios_dev_node_info(struct pnp_dev_node_info *data);
+extern int pnp_bios_get_dev_node(u8 *nodenum, char config,
+				 struct pnp_bios_node *data);
+extern int pnp_bios_set_dev_node(u8 nodenum, char config,
+				 struct pnp_bios_node *data);
+extern int pnp_bios_get_stat_res(char *info);
+extern int pnp_bios_isapnp_config(struct pnp_isa_config_struc *data);
+extern int pnp_bios_escd_info(struct escd_info_struc *data);
+extern int pnp_bios_read_escd(char *data, u32 nvram_base);
+extern int pnp_bios_dock_station_info(struct pnp_docking_station_info *data);
+
+#pragma pack(1)
+union pnp_bios_install_struct {
+	struct {
+		u32 signature;    /* "$PnP" */
+		u8 version;	  /* in BCD */
+		u8 length;	  /* length in bytes, currently 21h */
+		u16 control;	  /* system capabilities */
+		u8 checksum;	  /* all bytes must add up to 0 */
+
+		u32 eventflag;    /* phys. address of the event flag */
+		u16 rmoffset;     /* real mode entry point */
+		u16 rmcseg;
+		u16 pm16offset;   /* 16 bit protected mode entry */
+		u32 pm16cseg;
+		u32 deviceID;	  /* EISA encoded system ID or 0 */
+		u16 rmdseg;	  /* real mode data segment */
+		u32 pm16dseg;	  /* 16 bit pm data segment base */
+	} fields;
+	char chars[0x21];	  /* To calculate the checksum */
+};
+#pragma pack()
+
+extern int pnp_bios_present(void);
+extern int  pnpbios_dont_use_current_config;
+
+extern int pnpbios_parse_data_stream(struct pnp_dev *dev, struct pnp_bios_node * node);
+extern int pnpbios_read_resources_from_node(struct pnp_dev *dev, struct pnp_bios_node *node);
+extern int pnpbios_write_resources_to_node(struct pnp_dev *dev, struct pnp_bios_node *node);
+extern void pnpid32_to_pnpid(u32 id, char *str);
+
+extern void pnpbios_print_status(const char * module, u16 status);
+extern void pnpbios_calls_init(union pnp_bios_install_struct * header);
+
+#ifdef CONFIG_PNPBIOS_PROC_FS
+extern int pnpbios_interface_attach_device(struct pnp_bios_node * node);
+extern int pnpbios_proc_init (void);
+extern void pnpbios_proc_exit (void);
+#else
+static inline int pnpbios_interface_attach_device(struct pnp_bios_node * node) { return 0; }
+static inline int pnpbios_proc_init (void) { return 0; }
+static inline void pnpbios_proc_exit (void) { ; }
+#endif /* CONFIG_PNPBIOS_PROC_FS */
diff --git a/drivers/pnp/pnpbios/proc.c b/drivers/pnp/pnpbios/proc.c
new file mode 100644
index 000000000..a806830e3
--- /dev/null
+++ b/drivers/pnp/pnpbios/proc.c
@@ -0,0 +1,286 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * /proc/bus/pnp interface for Plug and Play devices
+ *
+ * Written by David Hinds, dahinds@users.sourceforge.net
+ * Modified by Thomas Hood
+ *
+ * The .../devices and .../<node> and .../boot/<node> files are
+ * utilized by the lspnp and setpnp utilities, supplied with the
+ * pcmcia-cs package.
+ *     http://pcmcia-cs.sourceforge.net
+ *
+ * The .../escd file is utilized by the lsescd utility written by
+ * Gunther Mayer.
+ *
+ * The .../legacy_device_resources file is not used yet.
+ *
+ * The other files are human-readable.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/proc_fs.h>
+#include <linux/pnp.h>
+#include <linux/seq_file.h>
+#include <linux/init.h>
+
+#include <linux/uaccess.h>
+
+#include "pnpbios.h"
+
+static struct proc_dir_entry *proc_pnp = NULL;
+static struct proc_dir_entry *proc_pnp_boot = NULL;
+
+static int pnpconfig_proc_show(struct seq_file *m, void *v)
+{
+	struct pnp_isa_config_struc pnps;
+
+	if (pnp_bios_isapnp_config(&pnps))
+		return -EIO;
+	seq_printf(m, "structure_revision %d\n"
+		      "number_of_CSNs %d\n"
+		      "ISA_read_data_port 0x%x\n",
+		   pnps.revision, pnps.no_csns, pnps.isa_rd_data_port);
+	return 0;
+}
+
+static int escd_info_proc_show(struct seq_file *m, void *v)
+{
+	struct escd_info_struc escd;
+
+	if (pnp_bios_escd_info(&escd))
+		return -EIO;
+	seq_printf(m, "min_ESCD_write_size %d\n"
+			"ESCD_size %d\n"
+			"NVRAM_base 0x%x\n",
+			escd.min_escd_write_size,
+			escd.escd_size, escd.nv_storage_base);
+	return 0;
+}
+
+#define MAX_SANE_ESCD_SIZE (32*1024)
+static int escd_proc_show(struct seq_file *m, void *v)
+{
+	struct escd_info_struc escd;
+	char *tmpbuf;
+	int escd_size;
+
+	if (pnp_bios_escd_info(&escd))
+		return -EIO;
+
+	/* sanity check */
+	if (escd.escd_size > MAX_SANE_ESCD_SIZE) {
+		printk(KERN_ERR
+		       "PnPBIOS: %s: ESCD size reported by BIOS escd_info call is too great\n", __func__);
+		return -EFBIG;
+	}
+
+	tmpbuf = kzalloc(escd.escd_size, GFP_KERNEL);
+	if (!tmpbuf)
+		return -ENOMEM;
+
+	if (pnp_bios_read_escd(tmpbuf, escd.nv_storage_base)) {
+		kfree(tmpbuf);
+		return -EIO;
+	}
+
+	escd_size =
+	    (unsigned char)(tmpbuf[0]) + (unsigned char)(tmpbuf[1]) * 256;
+
+	/* sanity check */
+	if (escd_size > MAX_SANE_ESCD_SIZE) {
+		printk(KERN_ERR "PnPBIOS: %s: ESCD size reported by"
+				" BIOS read_escd call is too great\n", __func__);
+		kfree(tmpbuf);
+		return -EFBIG;
+	}
+
+	seq_write(m, tmpbuf, escd_size);
+	kfree(tmpbuf);
+	return 0;
+}
+
+static int pnp_legacyres_proc_show(struct seq_file *m, void *v)
+{
+	void *buf;
+
+	buf = kmalloc(65536, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+	if (pnp_bios_get_stat_res(buf)) {
+		kfree(buf);
+		return -EIO;
+	}
+
+	seq_write(m, buf, 65536);
+	kfree(buf);
+	return 0;
+}
+
+static int pnp_devices_proc_show(struct seq_file *m, void *v)
+{
+	struct pnp_bios_node *node;
+	u8 nodenum;
+
+	node = kzalloc(node_info.max_node_size, GFP_KERNEL);
+	if (!node)
+		return -ENOMEM;
+
+	for (nodenum = 0; nodenum < 0xff;) {
+		u8 thisnodenum = nodenum;
+
+		if (pnp_bios_get_dev_node(&nodenum, PNPMODE_DYNAMIC, node))
+			break;
+		seq_printf(m, "%02x\t%08x\t%3phC\t%04x\n",
+			     node->handle, node->eisa_id,
+			     node->type_code, node->flags);
+		if (nodenum <= thisnodenum) {
+			printk(KERN_ERR
+			       "%s Node number 0x%x is out of sequence following node 0x%x. Aborting.\n",
+			       "PnPBIOS: proc_read_devices:",
+			       (unsigned int)nodenum,
+			       (unsigned int)thisnodenum);
+			break;
+		}
+	}
+	kfree(node);
+	return 0;
+}
+
+static int pnpbios_proc_show(struct seq_file *m, void *v)
+{
+	void *data = m->private;
+	struct pnp_bios_node *node;
+	int boot = (long)data >> 8;
+	u8 nodenum = (long)data;
+	int len;
+
+	node = kzalloc(node_info.max_node_size, GFP_KERNEL);
+	if (!node)
+		return -ENOMEM;
+	if (pnp_bios_get_dev_node(&nodenum, boot, node)) {
+		kfree(node);
+		return -EIO;
+	}
+	len = node->size - sizeof(struct pnp_bios_node);
+	seq_write(m, node->data, len);
+	kfree(node);
+	return 0;
+}
+
+static int pnpbios_proc_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, pnpbios_proc_show, PDE_DATA(inode));
+}
+
+static ssize_t pnpbios_proc_write(struct file *file, const char __user *buf,
+				  size_t count, loff_t *pos)
+{
+	void *data = PDE_DATA(file_inode(file));
+	struct pnp_bios_node *node;
+	int boot = (long)data >> 8;
+	u8 nodenum = (long)data;
+	int ret = count;
+
+	node = kzalloc(node_info.max_node_size, GFP_KERNEL);
+	if (!node)
+		return -ENOMEM;
+	if (pnp_bios_get_dev_node(&nodenum, boot, node)) {
+		ret = -EIO;
+		goto out;
+	}
+	if (count != node->size - sizeof(struct pnp_bios_node)) {
+		ret = -EINVAL;
+		goto out;
+	}
+	if (copy_from_user(node->data, buf, count)) {
+		ret = -EFAULT;
+		goto out;
+	}
+	if (pnp_bios_set_dev_node(node->handle, boot, node) != 0) {
+		ret = -EINVAL;
+		goto out;
+	}
+	ret = count;
+out:
+	kfree(node);
+	return ret;
+}
+
+static const struct proc_ops pnpbios_proc_ops = {
+	.proc_open	= pnpbios_proc_open,
+	.proc_read	= seq_read,
+	.proc_lseek	= seq_lseek,
+	.proc_release	= single_release,
+	.proc_write	= pnpbios_proc_write,
+};
+
+int pnpbios_interface_attach_device(struct pnp_bios_node *node)
+{
+	char name[3];
+
+	sprintf(name, "%02x", node->handle);
+
+	if (!proc_pnp)
+		return -EIO;
+	if (!pnpbios_dont_use_current_config) {
+		proc_create_data(name, 0644, proc_pnp, &pnpbios_proc_ops,
+				 (void *)(long)(node->handle));
+	}
+
+	if (!proc_pnp_boot)
+		return -EIO;
+	if (proc_create_data(name, 0644, proc_pnp_boot, &pnpbios_proc_ops,
+			     (void *)(long)(node->handle + 0x100)))
+		return 0;
+	return -EIO;
+}
+
+/*
+ * When this is called, pnpbios functions are assumed to
+ * work and the pnpbios_dont_use_current_config flag
+ * should already have been set to the appropriate value
+ */
+int __init pnpbios_proc_init(void)
+{
+	proc_pnp = proc_mkdir("bus/pnp", NULL);
+	if (!proc_pnp)
+		return -EIO;
+	proc_pnp_boot = proc_mkdir("boot", proc_pnp);
+	if (!proc_pnp_boot)
+		return -EIO;
+	proc_create_single("devices", 0, proc_pnp, pnp_devices_proc_show);
+	proc_create_single("configuration_info", 0, proc_pnp,
+			pnpconfig_proc_show);
+	proc_create_single("escd_info", 0, proc_pnp, escd_info_proc_show);
+	proc_create_single("escd", S_IRUSR, proc_pnp, escd_proc_show);
+	proc_create_single("legacy_device_resources", 0, proc_pnp,
+			pnp_legacyres_proc_show);
+	return 0;
+}
+
+void __exit pnpbios_proc_exit(void)
+{
+	int i;
+	char name[3];
+
+	if (!proc_pnp)
+		return;
+
+	for (i = 0; i < 0xff; i++) {
+		sprintf(name, "%02x", i);
+		if (!pnpbios_dont_use_current_config)
+			remove_proc_entry(name, proc_pnp);
+		remove_proc_entry(name, proc_pnp_boot);
+	}
+	remove_proc_entry("legacy_device_resources", proc_pnp);
+	remove_proc_entry("escd", proc_pnp);
+	remove_proc_entry("escd_info", proc_pnp);
+	remove_proc_entry("configuration_info", proc_pnp);
+	remove_proc_entry("devices", proc_pnp);
+	remove_proc_entry("boot", proc_pnp);
+	remove_proc_entry("bus/pnp", NULL);
+}
diff --git a/drivers/pnp/pnpbios/rsparser.c b/drivers/pnp/pnpbios/rsparser.c
new file mode 100644
index 000000000..2f31b212b
--- /dev/null
+++ b/drivers/pnp/pnpbios/rsparser.c
@@ -0,0 +1,810 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * rsparser.c - parses and encodes pnpbios resource data streams
+ */
+
+#include <linux/ctype.h>
+#include <linux/pnp.h>
+#include <linux/string.h>
+
+#ifdef CONFIG_PCI
+#include <linux/pci.h>
+#else
+inline void pcibios_penalize_isa_irq(int irq, int active)
+{
+}
+#endif				/* CONFIG_PCI */
+
+#include "../base.h"
+#include "pnpbios.h"
+
+/* standard resource tags */
+#define SMALL_TAG_PNPVERNO		0x01
+#define SMALL_TAG_LOGDEVID		0x02
+#define SMALL_TAG_COMPATDEVID		0x03
+#define SMALL_TAG_IRQ			0x04
+#define SMALL_TAG_DMA			0x05
+#define SMALL_TAG_STARTDEP		0x06
+#define SMALL_TAG_ENDDEP		0x07
+#define SMALL_TAG_PORT			0x08
+#define SMALL_TAG_FIXEDPORT		0x09
+#define SMALL_TAG_VENDOR		0x0e
+#define SMALL_TAG_END			0x0f
+#define LARGE_TAG			0x80
+#define LARGE_TAG_MEM			0x81
+#define LARGE_TAG_ANSISTR		0x82
+#define LARGE_TAG_UNICODESTR		0x83
+#define LARGE_TAG_VENDOR		0x84
+#define LARGE_TAG_MEM32			0x85
+#define LARGE_TAG_FIXEDMEM32		0x86
+
+/*
+ * Resource Data Stream Format:
+ *
+ * Allocated Resources (required)
+ * end tag ->
+ * Resource Configuration Options (optional)
+ * end tag ->
+ * Compitable Device IDs (optional)
+ * final end tag ->
+ */
+
+/*
+ * Allocated Resources
+ */
+
+static void pnpbios_parse_allocated_ioresource(struct pnp_dev *dev,
+					       int start, int len)
+{
+	int flags = 0;
+	int end = start + len - 1;
+
+	if (len <= 0 || end >= 0x10003)
+		flags |= IORESOURCE_DISABLED;
+
+	pnp_add_io_resource(dev, start, end, flags);
+}
+
+static void pnpbios_parse_allocated_memresource(struct pnp_dev *dev,
+						int start, int len)
+{
+	int flags = 0;
+	int end = start + len - 1;
+
+	if (len <= 0)
+		flags |= IORESOURCE_DISABLED;
+
+	pnp_add_mem_resource(dev, start, end, flags);
+}
+
+static unsigned char *pnpbios_parse_allocated_resource_data(struct pnp_dev *dev,
+							    unsigned char *p,
+							    unsigned char *end)
+{
+	unsigned int len, tag;
+	int io, size, mask, i, flags;
+
+	if (!p)
+		return NULL;
+
+	pnp_dbg(&dev->dev, "parse allocated resources\n");
+
+	pnp_init_resources(dev);
+
+	while ((char *)p < (char *)end) {
+
+		/* determine the type of tag */
+		if (p[0] & LARGE_TAG) {	/* large tag */
+			len = (p[2] << 8) | p[1];
+			tag = p[0];
+		} else {	/* small tag */
+			len = p[0] & 0x07;
+			tag = ((p[0] >> 3) & 0x0f);
+		}
+
+		switch (tag) {
+
+		case LARGE_TAG_MEM:
+			if (len != 9)
+				goto len_err;
+			io = *(short *)&p[4];
+			size = *(short *)&p[10];
+			pnpbios_parse_allocated_memresource(dev, io, size);
+			break;
+
+		case LARGE_TAG_ANSISTR:
+			/* ignore this for now */
+			break;
+
+		case LARGE_TAG_VENDOR:
+			/* do nothing */
+			break;
+
+		case LARGE_TAG_MEM32:
+			if (len != 17)
+				goto len_err;
+			io = *(int *)&p[4];
+			size = *(int *)&p[16];
+			pnpbios_parse_allocated_memresource(dev, io, size);
+			break;
+
+		case LARGE_TAG_FIXEDMEM32:
+			if (len != 9)
+				goto len_err;
+			io = *(int *)&p[4];
+			size = *(int *)&p[8];
+			pnpbios_parse_allocated_memresource(dev, io, size);
+			break;
+
+		case SMALL_TAG_IRQ:
+			if (len < 2 || len > 3)
+				goto len_err;
+			flags = 0;
+			io = -1;
+			mask = p[1] + p[2] * 256;
+			for (i = 0; i < 16; i++, mask = mask >> 1)
+				if (mask & 0x01)
+					io = i;
+			if (io != -1)
+				pcibios_penalize_isa_irq(io, 1);
+			else
+				flags = IORESOURCE_DISABLED;
+			pnp_add_irq_resource(dev, io, flags);
+			break;
+
+		case SMALL_TAG_DMA:
+			if (len != 2)
+				goto len_err;
+			flags = 0;
+			io = -1;
+			mask = p[1];
+			for (i = 0; i < 8; i++, mask = mask >> 1)
+				if (mask & 0x01)
+					io = i;
+			if (io == -1)
+				flags = IORESOURCE_DISABLED;
+			pnp_add_dma_resource(dev, io, flags);
+			break;
+
+		case SMALL_TAG_PORT:
+			if (len != 7)
+				goto len_err;
+			io = p[2] + p[3] * 256;
+			size = p[7];
+			pnpbios_parse_allocated_ioresource(dev, io, size);
+			break;
+
+		case SMALL_TAG_VENDOR:
+			/* do nothing */
+			break;
+
+		case SMALL_TAG_FIXEDPORT:
+			if (len != 3)
+				goto len_err;
+			io = p[1] + p[2] * 256;
+			size = p[3];
+			pnpbios_parse_allocated_ioresource(dev, io, size);
+			break;
+
+		case SMALL_TAG_END:
+			p = p + 2;
+			return (unsigned char *)p;
+			break;
+
+		default:	/* an unknown tag */
+len_err:
+			dev_err(&dev->dev, "unknown tag %#x length %d\n",
+				tag, len);
+			break;
+		}
+
+		/* continue to the next tag */
+		if (p[0] & LARGE_TAG)
+			p += len + 3;
+		else
+			p += len + 1;
+	}
+
+	dev_err(&dev->dev, "no end tag in resource structure\n");
+
+	return NULL;
+}
+
+/*
+ * Resource Configuration Options
+ */
+
+static __init void pnpbios_parse_mem_option(struct pnp_dev *dev,
+					    unsigned char *p, int size,
+					    unsigned int option_flags)
+{
+	resource_size_t min, max, align, len;
+	unsigned char flags;
+
+	min = ((p[5] << 8) | p[4]) << 8;
+	max = ((p[7] << 8) | p[6]) << 8;
+	align = (p[9] << 8) | p[8];
+	len = ((p[11] << 8) | p[10]) << 8;
+	flags = p[3];
+	pnp_register_mem_resource(dev, option_flags, min, max, align, len,
+				  flags);
+}
+
+static __init void pnpbios_parse_mem32_option(struct pnp_dev *dev,
+					      unsigned char *p, int size,
+					      unsigned int option_flags)
+{
+	resource_size_t min, max, align, len;
+	unsigned char flags;
+
+	min = (p[7] << 24) | (p[6] << 16) | (p[5] << 8) | p[4];
+	max = (p[11] << 24) | (p[10] << 16) | (p[9] << 8) | p[8];
+	align = (p[15] << 24) | (p[14] << 16) | (p[13] << 8) | p[12];
+	len = (p[19] << 24) | (p[18] << 16) | (p[17] << 8) | p[16];
+	flags = p[3];
+	pnp_register_mem_resource(dev, option_flags, min, max, align, len,
+				  flags);
+}
+
+static __init void pnpbios_parse_fixed_mem32_option(struct pnp_dev *dev,
+						    unsigned char *p, int size,
+						    unsigned int option_flags)
+{
+	resource_size_t base, len;
+	unsigned char flags;
+
+	base = (p[7] << 24) | (p[6] << 16) | (p[5] << 8) | p[4];
+	len = (p[11] << 24) | (p[10] << 16) | (p[9] << 8) | p[8];
+	flags = p[3];
+	pnp_register_mem_resource(dev, option_flags, base, base, 0, len, flags);
+}
+
+static __init void pnpbios_parse_irq_option(struct pnp_dev *dev,
+					    unsigned char *p, int size,
+					    unsigned int option_flags)
+{
+	unsigned long bits;
+	pnp_irq_mask_t map;
+	unsigned char flags = IORESOURCE_IRQ_HIGHEDGE;
+
+	bits = (p[2] << 8) | p[1];
+
+	bitmap_zero(map.bits, PNP_IRQ_NR);
+	bitmap_copy(map.bits, &bits, 16);
+
+	if (size > 2)
+		flags = p[3];
+
+	pnp_register_irq_resource(dev, option_flags, &map, flags);
+}
+
+static __init void pnpbios_parse_dma_option(struct pnp_dev *dev,
+					    unsigned char *p, int size,
+					    unsigned int option_flags)
+{
+	pnp_register_dma_resource(dev, option_flags, p[1], p[2]);
+}
+
+static __init void pnpbios_parse_port_option(struct pnp_dev *dev,
+					     unsigned char *p, int size,
+					     unsigned int option_flags)
+{
+	resource_size_t min, max, align, len;
+	unsigned char flags;
+
+	min = (p[3] << 8) | p[2];
+	max = (p[5] << 8) | p[4];
+	align = p[6];
+	len = p[7];
+	flags = p[1] ? IORESOURCE_IO_16BIT_ADDR : 0;
+	pnp_register_port_resource(dev, option_flags, min, max, align, len,
+				   flags);
+}
+
+static __init void pnpbios_parse_fixed_port_option(struct pnp_dev *dev,
+						   unsigned char *p, int size,
+						   unsigned int option_flags)
+{
+	resource_size_t base, len;
+
+	base = (p[2] << 8) | p[1];
+	len = p[3];
+	pnp_register_port_resource(dev, option_flags, base, base, 0, len,
+				   IORESOURCE_IO_FIXED);
+}
+
+static __init unsigned char *
+pnpbios_parse_resource_option_data(unsigned char *p, unsigned char *end,
+				   struct pnp_dev *dev)
+{
+	unsigned int len, tag;
+	int priority;
+	unsigned int option_flags;
+
+	if (!p)
+		return NULL;
+
+	pnp_dbg(&dev->dev, "parse resource options\n");
+	option_flags = 0;
+	while ((char *)p < (char *)end) {
+
+		/* determine the type of tag */
+		if (p[0] & LARGE_TAG) {	/* large tag */
+			len = (p[2] << 8) | p[1];
+			tag = p[0];
+		} else {	/* small tag */
+			len = p[0] & 0x07;
+			tag = ((p[0] >> 3) & 0x0f);
+		}
+
+		switch (tag) {
+
+		case LARGE_TAG_MEM:
+			if (len != 9)
+				goto len_err;
+			pnpbios_parse_mem_option(dev, p, len, option_flags);
+			break;
+
+		case LARGE_TAG_MEM32:
+			if (len != 17)
+				goto len_err;
+			pnpbios_parse_mem32_option(dev, p, len, option_flags);
+			break;
+
+		case LARGE_TAG_FIXEDMEM32:
+			if (len != 9)
+				goto len_err;
+			pnpbios_parse_fixed_mem32_option(dev, p, len,
+							 option_flags);
+			break;
+
+		case SMALL_TAG_IRQ:
+			if (len < 2 || len > 3)
+				goto len_err;
+			pnpbios_parse_irq_option(dev, p, len, option_flags);
+			break;
+
+		case SMALL_TAG_DMA:
+			if (len != 2)
+				goto len_err;
+			pnpbios_parse_dma_option(dev, p, len, option_flags);
+			break;
+
+		case SMALL_TAG_PORT:
+			if (len != 7)
+				goto len_err;
+			pnpbios_parse_port_option(dev, p, len, option_flags);
+			break;
+
+		case SMALL_TAG_VENDOR:
+			/* do nothing */
+			break;
+
+		case SMALL_TAG_FIXEDPORT:
+			if (len != 3)
+				goto len_err;
+			pnpbios_parse_fixed_port_option(dev, p, len,
+							option_flags);
+			break;
+
+		case SMALL_TAG_STARTDEP:
+			if (len > 1)
+				goto len_err;
+			priority = PNP_RES_PRIORITY_ACCEPTABLE;
+			if (len > 0)
+				priority = p[1];
+			option_flags = pnp_new_dependent_set(dev, priority);
+			break;
+
+		case SMALL_TAG_ENDDEP:
+			if (len != 0)
+				goto len_err;
+			option_flags = 0;
+			break;
+
+		case SMALL_TAG_END:
+			return p + 2;
+
+		default:	/* an unknown tag */
+len_err:
+			dev_err(&dev->dev, "unknown tag %#x length %d\n",
+				tag, len);
+			break;
+		}
+
+		/* continue to the next tag */
+		if (p[0] & LARGE_TAG)
+			p += len + 3;
+		else
+			p += len + 1;
+	}
+
+	dev_err(&dev->dev, "no end tag in resource structure\n");
+
+	return NULL;
+}
+
+/*
+ * Compatible Device IDs
+ */
+
+static unsigned char *pnpbios_parse_compatible_ids(unsigned char *p,
+						   unsigned char *end,
+						   struct pnp_dev *dev)
+{
+	int len, tag;
+	u32 eisa_id;
+	char id[8];
+	struct pnp_id *dev_id;
+
+	if (!p)
+		return NULL;
+
+	while ((char *)p < (char *)end) {
+
+		/* determine the type of tag */
+		if (p[0] & LARGE_TAG) {	/* large tag */
+			len = (p[2] << 8) | p[1];
+			tag = p[0];
+		} else {	/* small tag */
+			len = p[0] & 0x07;
+			tag = ((p[0] >> 3) & 0x0f);
+		}
+
+		switch (tag) {
+
+		case LARGE_TAG_ANSISTR:
+			strncpy(dev->name, p + 3,
+				len >= PNP_NAME_LEN ? PNP_NAME_LEN - 2 : len);
+			dev->name[len >=
+				  PNP_NAME_LEN ? PNP_NAME_LEN - 1 : len] = '\0';
+			break;
+
+		case SMALL_TAG_COMPATDEVID:	/* compatible ID */
+			if (len != 4)
+				goto len_err;
+			eisa_id = p[1] | p[2] << 8 | p[3] << 16 | p[4] << 24;
+			pnp_eisa_id_to_string(eisa_id & PNP_EISA_ID_MASK, id);
+			dev_id = pnp_add_id(dev, id);
+			if (!dev_id)
+				return NULL;
+			break;
+
+		case SMALL_TAG_END:
+			p = p + 2;
+			return (unsigned char *)p;
+			break;
+
+		default:	/* an unknown tag */
+len_err:
+			dev_err(&dev->dev, "unknown tag %#x length %d\n",
+				tag, len);
+			break;
+		}
+
+		/* continue to the next tag */
+		if (p[0] & LARGE_TAG)
+			p += len + 3;
+		else
+			p += len + 1;
+	}
+
+	dev_err(&dev->dev, "no end tag in resource structure\n");
+
+	return NULL;
+}
+
+/*
+ * Allocated Resource Encoding
+ */
+
+static void pnpbios_encode_mem(struct pnp_dev *dev, unsigned char *p,
+			       struct resource *res)
+{
+	unsigned long base;
+	unsigned long len;
+
+	if (pnp_resource_enabled(res)) {
+		base = res->start;
+		len = resource_size(res);
+	} else {
+		base = 0;
+		len = 0;
+	}
+
+	p[4] = (base >> 8) & 0xff;
+	p[5] = ((base >> 8) >> 8) & 0xff;
+	p[6] = (base >> 8) & 0xff;
+	p[7] = ((base >> 8) >> 8) & 0xff;
+	p[10] = (len >> 8) & 0xff;
+	p[11] = ((len >> 8) >> 8) & 0xff;
+
+	pnp_dbg(&dev->dev, "  encode mem %#lx-%#lx\n", base, base + len - 1);
+}
+
+static void pnpbios_encode_mem32(struct pnp_dev *dev, unsigned char *p,
+				 struct resource *res)
+{
+	unsigned long base;
+	unsigned long len;
+
+	if (pnp_resource_enabled(res)) {
+		base = res->start;
+		len = resource_size(res);
+	} else {
+		base = 0;
+		len = 0;
+	}
+
+	p[4] = base & 0xff;
+	p[5] = (base >> 8) & 0xff;
+	p[6] = (base >> 16) & 0xff;
+	p[7] = (base >> 24) & 0xff;
+	p[8] = base & 0xff;
+	p[9] = (base >> 8) & 0xff;
+	p[10] = (base >> 16) & 0xff;
+	p[11] = (base >> 24) & 0xff;
+	p[16] = len & 0xff;
+	p[17] = (len >> 8) & 0xff;
+	p[18] = (len >> 16) & 0xff;
+	p[19] = (len >> 24) & 0xff;
+
+	pnp_dbg(&dev->dev, "  encode mem32 %#lx-%#lx\n", base, base + len - 1);
+}
+
+static void pnpbios_encode_fixed_mem32(struct pnp_dev *dev, unsigned char *p,
+				       struct resource *res)
+{
+	unsigned long base;
+	unsigned long len;
+
+	if (pnp_resource_enabled(res)) {
+		base = res->start;
+		len = resource_size(res);
+	} else {
+		base = 0;
+		len = 0;
+	}
+
+	p[4] = base & 0xff;
+	p[5] = (base >> 8) & 0xff;
+	p[6] = (base >> 16) & 0xff;
+	p[7] = (base >> 24) & 0xff;
+	p[8] = len & 0xff;
+	p[9] = (len >> 8) & 0xff;
+	p[10] = (len >> 16) & 0xff;
+	p[11] = (len >> 24) & 0xff;
+
+	pnp_dbg(&dev->dev, "  encode fixed_mem32 %#lx-%#lx\n", base,
+		base + len - 1);
+}
+
+static void pnpbios_encode_irq(struct pnp_dev *dev, unsigned char *p,
+			       struct resource *res)
+{
+	unsigned long map;
+
+	if (pnp_resource_enabled(res))
+		map = 1 << res->start;
+	else
+		map = 0;
+
+	p[1] = map & 0xff;
+	p[2] = (map >> 8) & 0xff;
+
+	pnp_dbg(&dev->dev, "  encode irq mask %#lx\n", map);
+}
+
+static void pnpbios_encode_dma(struct pnp_dev *dev, unsigned char *p,
+			       struct resource *res)
+{
+	unsigned long map;
+
+	if (pnp_resource_enabled(res))
+		map = 1 << res->start;
+	else
+		map = 0;
+
+	p[1] = map & 0xff;
+
+	pnp_dbg(&dev->dev, "  encode dma mask %#lx\n", map);
+}
+
+static void pnpbios_encode_port(struct pnp_dev *dev, unsigned char *p,
+				struct resource *res)
+{
+	unsigned long base;
+	unsigned long len;
+
+	if (pnp_resource_enabled(res)) {
+		base = res->start;
+		len = resource_size(res);
+	} else {
+		base = 0;
+		len = 0;
+	}
+
+	p[2] = base & 0xff;
+	p[3] = (base >> 8) & 0xff;
+	p[4] = base & 0xff;
+	p[5] = (base >> 8) & 0xff;
+	p[7] = len & 0xff;
+
+	pnp_dbg(&dev->dev, "  encode io %#lx-%#lx\n", base, base + len - 1);
+}
+
+static void pnpbios_encode_fixed_port(struct pnp_dev *dev, unsigned char *p,
+				      struct resource *res)
+{
+	unsigned long base = res->start;
+	unsigned long len = resource_size(res);
+
+	if (pnp_resource_enabled(res)) {
+		base = res->start;
+		len = resource_size(res);
+	} else {
+		base = 0;
+		len = 0;
+	}
+
+	p[1] = base & 0xff;
+	p[2] = (base >> 8) & 0xff;
+	p[3] = len & 0xff;
+
+	pnp_dbg(&dev->dev, "  encode fixed_io %#lx-%#lx\n", base,
+		base + len - 1);
+}
+
+static unsigned char *pnpbios_encode_allocated_resource_data(struct pnp_dev
+								*dev,
+							     unsigned char *p,
+							     unsigned char *end)
+{
+	unsigned int len, tag;
+	int port = 0, irq = 0, dma = 0, mem = 0;
+
+	if (!p)
+		return NULL;
+
+	while ((char *)p < (char *)end) {
+
+		/* determine the type of tag */
+		if (p[0] & LARGE_TAG) {	/* large tag */
+			len = (p[2] << 8) | p[1];
+			tag = p[0];
+		} else {	/* small tag */
+			len = p[0] & 0x07;
+			tag = ((p[0] >> 3) & 0x0f);
+		}
+
+		switch (tag) {
+
+		case LARGE_TAG_MEM:
+			if (len != 9)
+				goto len_err;
+			pnpbios_encode_mem(dev, p,
+				pnp_get_resource(dev, IORESOURCE_MEM, mem));
+			mem++;
+			break;
+
+		case LARGE_TAG_MEM32:
+			if (len != 17)
+				goto len_err;
+			pnpbios_encode_mem32(dev, p,
+				pnp_get_resource(dev, IORESOURCE_MEM, mem));
+			mem++;
+			break;
+
+		case LARGE_TAG_FIXEDMEM32:
+			if (len != 9)
+				goto len_err;
+			pnpbios_encode_fixed_mem32(dev, p,
+				pnp_get_resource(dev, IORESOURCE_MEM, mem));
+			mem++;
+			break;
+
+		case SMALL_TAG_IRQ:
+			if (len < 2 || len > 3)
+				goto len_err;
+			pnpbios_encode_irq(dev, p,
+				pnp_get_resource(dev, IORESOURCE_IRQ, irq));
+			irq++;
+			break;
+
+		case SMALL_TAG_DMA:
+			if (len != 2)
+				goto len_err;
+			pnpbios_encode_dma(dev, p,
+				pnp_get_resource(dev, IORESOURCE_DMA, dma));
+			dma++;
+			break;
+
+		case SMALL_TAG_PORT:
+			if (len != 7)
+				goto len_err;
+			pnpbios_encode_port(dev, p,
+				pnp_get_resource(dev, IORESOURCE_IO, port));
+			port++;
+			break;
+
+		case SMALL_TAG_VENDOR:
+			/* do nothing */
+			break;
+
+		case SMALL_TAG_FIXEDPORT:
+			if (len != 3)
+				goto len_err;
+			pnpbios_encode_fixed_port(dev, p,
+				pnp_get_resource(dev, IORESOURCE_IO, port));
+			port++;
+			break;
+
+		case SMALL_TAG_END:
+			p = p + 2;
+			return (unsigned char *)p;
+			break;
+
+		default:	/* an unknown tag */
+len_err:
+			dev_err(&dev->dev, "unknown tag %#x length %d\n",
+				tag, len);
+			break;
+		}
+
+		/* continue to the next tag */
+		if (p[0] & LARGE_TAG)
+			p += len + 3;
+		else
+			p += len + 1;
+	}
+
+	dev_err(&dev->dev, "no end tag in resource structure\n");
+
+	return NULL;
+}
+
+/*
+ * Core Parsing Functions
+ */
+
+int __init pnpbios_parse_data_stream(struct pnp_dev *dev,
+					struct pnp_bios_node *node)
+{
+	unsigned char *p = (char *)node->data;
+	unsigned char *end = (char *)(node->data + node->size);
+
+	p = pnpbios_parse_allocated_resource_data(dev, p, end);
+	if (!p)
+		return -EIO;
+	p = pnpbios_parse_resource_option_data(p, end, dev);
+	if (!p)
+		return -EIO;
+	p = pnpbios_parse_compatible_ids(p, end, dev);
+	if (!p)
+		return -EIO;
+	return 0;
+}
+
+int pnpbios_read_resources_from_node(struct pnp_dev *dev,
+				     struct pnp_bios_node *node)
+{
+	unsigned char *p = (char *)node->data;
+	unsigned char *end = (char *)(node->data + node->size);
+
+	p = pnpbios_parse_allocated_resource_data(dev, p, end);
+	if (!p)
+		return -EIO;
+	return 0;
+}
+
+int pnpbios_write_resources_to_node(struct pnp_dev *dev,
+				    struct pnp_bios_node *node)
+{
+	unsigned char *p = (char *)node->data;
+	unsigned char *end = (char *)(node->data + node->size);
+
+	p = pnpbios_encode_allocated_resource_data(dev, p, end);
+	if (!p)
+		return -EIO;
+	return 0;
+}