drivers/pnp/pnpbios/bioscalls.c - linux - Git at Google

 // 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(DESC_DATA32_BIOS,
 			(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 DEFINE_SPINLOCK(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;

 	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));
 	}
 }
	// 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(DESC_DATA32_BIOS,
	(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 DEFINE_SPINLOCK(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;

	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));
	}
	}