[net-next-2.6.git] / drivers / pnp / pnpbios / bioscalls.c

/*
 * 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/pnpbios.h>
#include <linux/device.h>
#include <linux/pnp.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/slab.h>
#include <linux/kmod.h>
#include <linux/completion.h>
#include <linux/spinlock.h>

#include <asm/page.h>
#include <asm/desc.h>
#include <asm/system.h>
#include <asm/byteorder.h>

#include "pnpbios.h"

static 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 void pnp_bios_callfunc(void);

__asm__(
	".text			\n"
	__ALIGN_STR "\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_table((cpu)); \
set_base(gdt[(selname) >> 3], (u32)(address)); \
set_limit(gdt[(selname) >> 3], size); \
} while(0)

static struct desc_struct bad_bios_desc = { 0, 0x00409200 };

/*
 * At some point we want to use this stack frame pointer to unwind
 * after PnP BIOS oopses.
 */

u32 pnp_bios_fault_esp;
u32 pnp_bios_fault_eip;
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_table(cpu)[0x40 / 8];
	get_cpu_gdt_table(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_table(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 occured\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;
}

#if needed
/*
 * Call PnP BIOS with function 0x03, "get event"
 */
static int pnp_bios_get_event(u16 *event)
{
	u16 status;
	if (!pnp_bios_present())
		return PNP_FUNCTION_NOT_SUPPORTED;
	status = call_pnp_bios(PNP_GET_EVENT, 0, PNP_TS1, PNP_DS, 0, 0 ,0 ,0,
			       event, sizeof(u16), NULL, 0);
	return status;
}
#endif

#if needed
/*
 * Call PnP BIOS with function 0x04, "send message"
 */
static int pnp_bios_send_message(u16 message)
{
	u16 status;
	if (!pnp_bios_present())
		return PNP_FUNCTION_NOT_SUPPORTED;
	status = call_pnp_bios(PNP_SEND_MESSAGE, message, PNP_DS, 0, 0, 0, 0, 0, 0, 0, 0, 0);
	return status;
}
#endif

/*
 * 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;
}

#if needed
/*
 * Call PnP BIOS with function 0x09, "set statically allocated resource
 * information"
 */
static int pnp_bios_set_stat_res(char *info)
{
	u16 status;
	if (!pnp_bios_present())
		return PNP_FUNCTION_NOT_SUPPORTED;
	status = call_pnp_bios(PNP_SET_STATIC_ALLOCED_RES_INFO, 0, PNP_TS1, PNP_DS, 0, 0, 0, 0,
			       info, *((u16 *) info), 0, 0);
	return status;
}
#endif

/*
 * 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;
}

#if needed
/*
 * Call PnP BIOS with function 0x0b, "get APM id table"
 */
static int pnp_bios_apm_id_table(char *table, u16 *size)
{
	u16 status;
	if (!pnp_bios_present())
		return PNP_FUNCTION_NOT_SUPPORTED;
	status = call_pnp_bios(PNP_GET_APM_ID_TABLE, 0, PNP_TS2, 0, PNP_TS1, PNP_DS, 0, 0,
			       table, *size, size, sizeof(u16));
	return status;
}
#endif

/*
 * 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;
}

#if needed
/*
 * Call PnP BIOS function 0x43, "write ESCD"
 */
static int pnp_bios_write_escd(char *data, u32 nvram_base)
{
	u16 status;
	if (!pnp_bios_present())
		return ESCD_FUNCTION_NOT_SUPPORTED;
	status = call_pnp_bios(PNP_WRITE_ESCD, 0, PNP_TS1, PNP_TS2, PNP_DS, 0, 0, 0,
			       data, 65536, __va(nvram_base), 65536);
	return status;
}
#endif


/*
 * Initialization
 */

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;

	set_base(bad_bios_desc, __va((unsigned long)0x40 << 4));
	_set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4));
 	for (i = 0; i < NR_CPUS; i++) {
  		struct desc_struct *gdt = get_cpu_gdt_table(i);
  		if (!gdt)
  			continue;
 		set_base(gdt[GDT_ENTRY_PNPBIOS_CS32], &pnp_bios_callfunc);
 		set_base(gdt[GDT_ENTRY_PNPBIOS_CS16], __va(header->fields.pm16cseg));
 		set_base(gdt[GDT_ENTRY_PNPBIOS_DS], __va(header->fields.pm16dseg));
  	}
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* bioscalls.c - the lowlevel layer of the PnPBIOS driver
	3	*
	4	*/
	5
	6	#include <linux/types.h>
	7	#include <linux/module.h>
	8	#include <linux/init.h>
	9	#include <linux/linkage.h>
	10	#include <linux/kernel.h>
	11	#include <linux/pnpbios.h>
	12	#include <linux/device.h>
	13	#include <linux/pnp.h>
	14	#include <linux/mm.h>
	15	#include <linux/smp.h>
	16	#include <linux/slab.h>
	17	#include <linux/kmod.h>
	18	#include <linux/completion.h>
	19	#include <linux/spinlock.h>
	20
	21	#include <asm/page.h>
	22	#include <asm/desc.h>
	23	#include <asm/system.h>
	24	#include <asm/byteorder.h>
	25
	26	#include "pnpbios.h"
	27
	28	static struct {
	29	u16 offset;
	30	u16 segment;
	31	} pnp_bios_callpoint;
	32
	33
1da177e4 LT	34	/*
	35	* These are some opcodes for a "static asmlinkage"
	36	* As this code is not executed inside the linux kernel segment, but in a
	37	* alias at offset 0, we need a far return that can not be compiled by
	38	* default (please, prove me wrong! this is really ugly!)
	39	* This is the only way to get the bios to return into the kernel code,
	40	* because the bios code runs in 16 bit protected mode and therefore can only
	41	* return to the caller if the call is within the first 64kB, and the linux
	42	* kernel begins at offset 3GB...
	43	*/
	44
	45	asmlinkage void pnp_bios_callfunc(void);
	46
	47	__asm__(
	48	".text \n"
	49	__ALIGN_STR "\n"
	50	"pnp_bios_callfunc:\n"
	51	" pushl %edx \n"
	52	" pushl %ecx \n"
	53	" pushl %ebx \n"
	54	" pushl %eax \n"
	55	" lcallw *pnp_bios_callpoint\n"
	56	" addl $16, %esp \n"
	57	" lret \n"
	58	".previous \n"
	59	);
	60
1da177e4 LT	61	#define Q2_SET_SEL(cpu, selname, address, size) \
1da177e4 LT	62	do { \
7c4cb60e ZA	63	struct desc_struct *gdt = get_cpu_gdt_table((cpu)); \
	64	set_base(gdt[(selname) >> 3], (u32)(address)); \
	65	set_limit(gdt[(selname) >> 3], size); \
1da177e4 LT	66	} while(0)
	67
	68	static struct desc_struct bad_bios_desc = { 0, 0x00409200 };
	69
	70	/*
	71	* At some point we want to use this stack frame pointer to unwind
	72	* after PnP BIOS oopses.
	73	*/
	74
	75	u32 pnp_bios_fault_esp;
	76	u32 pnp_bios_fault_eip;
	77	u32 pnp_bios_is_utter_crap = 0;
	78
	79	static spinlock_t pnp_bios_lock;
	80
	81
	82	/*
	83	* Support Functions
	84	*/
	85
	86	static inline u16 call_pnp_bios(u16 func, u16 arg1, u16 arg2, u16 arg3,
	87	u16 arg4, u16 arg5, u16 arg6, u16 arg7,
	88	void *ts1_base, u32 ts1_size,
	89	void *ts2_base, u32 ts2_size)
	90	{
	91	unsigned long flags;
	92	u16 status;
	93	struct desc_struct save_desc_40;
	94	int cpu;
	95
	96	/*
	97	* PnP BIOSes are generally not terribly re-entrant.
	98	* Also, don't rely on them to save everything correctly.
	99	*/
	100	if(pnp_bios_is_utter_crap)
	101	return PNP_FUNCTION_NOT_SUPPORTED;
	102
	103	cpu = get_cpu();
7c4cb60e ZA	104	save_desc_40 = get_cpu_gdt_table(cpu)[0x40 / 8];
7c4cb60e ZA	105	get_cpu_gdt_table(cpu)[0x40 / 8] = bad_bios_desc;
1da177e4 LT	106
	107	/* On some boxes IRQ's during PnP BIOS calls are deadly. */
	108	spin_lock_irqsave(&pnp_bios_lock, flags);
	109
	110	/* The lock prevents us bouncing CPU here */
	111	if (ts1_size)
	112	Q2_SET_SEL(smp_processor_id(), PNP_TS1, ts1_base, ts1_size);
	113	if (ts2_size)
	114	Q2_SET_SEL(smp_processor_id(), PNP_TS2, ts2_base, ts2_size);
	115
	116	__asm__ __volatile__(
	117	"pushl %%ebp\n\t"
	118	"pushl %%edi\n\t"
	119	"pushl %%esi\n\t"
	120	"pushl %%ds\n\t"
	121	"pushl %%es\n\t"
	122	"pushl %%fs\n\t"
	123	"pushl %%gs\n\t"
	124	"pushfl\n\t"
	125	"movl %%esp, pnp_bios_fault_esp\n\t"
	126	"movl $1f, pnp_bios_fault_eip\n\t"
	127	"lcall %5,%6\n\t"
	128	"1:popfl\n\t"
	129	"popl %%gs\n\t"
	130	"popl %%fs\n\t"
	131	"popl %%es\n\t"
	132	"popl %%ds\n\t"
	133	"popl %%esi\n\t"
	134	"popl %%edi\n\t"
	135	"popl %%ebp\n\t"
	136	: "=a" (status)
	137	: "0" ((func) \| (((u32)arg1) << 16)),
	138	"b" ((arg2) \| (((u32)arg3) << 16)),
	139	"c" ((arg4) \| (((u32)arg5) << 16)),
	140	"d" ((arg6) \| (((u32)arg7) << 16)),
	141	"i" (PNP_CS32),
	142	"i" (0)
	143	: "memory"
	144	);
	145	spin_unlock_irqrestore(&pnp_bios_lock, flags);
	146
7c4cb60e	147	get_cpu_gdt_table(cpu)[0x40 / 8] = save_desc_40;
1da177e4 LT	148	put_cpu();
	149
	150	/* If we get here and this is set then the PnP BIOS faulted on us. */
	151	if(pnp_bios_is_utter_crap)
	152	{
	153	printk(KERN_ERR "PnPBIOS: Warning! Your PnP BIOS caused a fatal error. Attempting to continue\n");
	154	printk(KERN_ERR "PnPBIOS: You may need to reboot with the \"pnpbios=off\" option to operate stably\n");
	155	printk(KERN_ERR "PnPBIOS: Check with your vendor for an updated BIOS\n");
	156	}
	157
	158	return status;
	159	}
	160
	161	void pnpbios_print_status(const char * module, u16 status)
	162	{
	163	switch(status) {
	164	case PNP_SUCCESS:
	165	printk(KERN_ERR "PnPBIOS: %s: function successful\n", module);
	166	break;
	167	case PNP_NOT_SET_STATICALLY:
	168	printk(KERN_ERR "PnPBIOS: %s: unable to set static resources\n", module);
	169	break;
	170	case PNP_UNKNOWN_FUNCTION:
	171	printk(KERN_ERR "PnPBIOS: %s: invalid function number passed\n", module);
	172	break;
	173	case PNP_FUNCTION_NOT_SUPPORTED:
	174	printk(KERN_ERR "PnPBIOS: %s: function not supported on this system\n", module);
	175	break;
	176	case PNP_INVALID_HANDLE:
	177	printk(KERN_ERR "PnPBIOS: %s: invalid handle\n", module);
	178	break;
	179	case PNP_BAD_PARAMETER:
	180	printk(KERN_ERR "PnPBIOS: %s: invalid parameters were passed\n", module);
	181	break;
	182	case PNP_SET_FAILED:
	183	printk(KERN_ERR "PnPBIOS: %s: unable to set resources\n", module);
	184	break;
	185	case PNP_EVENTS_NOT_PENDING:
	186	printk(KERN_ERR "PnPBIOS: %s: no events are pending\n", module);
	187	break;
	188	case PNP_SYSTEM_NOT_DOCKED:
	189	printk(KERN_ERR "PnPBIOS: %s: the system is not docked\n", module);
	190	break;
	191	case PNP_NO_ISA_PNP_CARDS:
	192	printk(KERN_ERR "PnPBIOS: %s: no isapnp cards are installed on this system\n", module);
	193	break;
	194	case PNP_UNABLE_TO_DETERMINE_DOCK_CAPABILITIES:
	195	printk(KERN_ERR "PnPBIOS: %s: cannot determine the capabilities of the docking station\n", module);
	196	break;
	197	case PNP_CONFIG_CHANGE_FAILED_NO_BATTERY:
	198	printk(KERN_ERR "PnPBIOS: %s: unable to undock, the system does not have a battery\n", module);
	199	break;
	200	case PNP_CONFIG_CHANGE_FAILED_RESOURCE_CONFLICT:
	201	printk(KERN_ERR "PnPBIOS: %s: could not dock due to resource conflicts\n", module);
	202	break;
	203	case PNP_BUFFER_TOO_SMALL:
	204	printk(KERN_ERR "PnPBIOS: %s: the buffer passed is too small\n", module);
	205	break;
	206	case PNP_USE_ESCD_SUPPORT:
	207	printk(KERN_ERR "PnPBIOS: %s: use ESCD instead\n", module);
	208	break;
	209	case PNP_MESSAGE_NOT_SUPPORTED:
	210	printk(KERN_ERR "PnPBIOS: %s: the message is unsupported\n", module);
	211	break;
212	case PNP_HARDWARE_ERROR:
213	printk(KERN_ERR "PnPBIOS: %s: a hardware failure has occured\n", module);
214	break;
215	default:
216	printk(KERN_ERR "PnPBIOS: %s: unexpected status 0x%x\n", module, status);
217	break;
218	}
219	}
220
221
222	/*
223	* PnP BIOS Low Level Calls
224	*/
225
226	#define PNP_GET_NUM_SYS_DEV_NODES 0x00
227	#define PNP_GET_SYS_DEV_NODE 0x01
228	#define PNP_SET_SYS_DEV_NODE 0x02
229	#define PNP_GET_EVENT 0x03
230	#define PNP_SEND_MESSAGE 0x04
231	#define PNP_GET_DOCKING_STATION_INFORMATION 0x05
232	#define PNP_SET_STATIC_ALLOCED_RES_INFO 0x09
233	#define PNP_GET_STATIC_ALLOCED_RES_INFO 0x0a
234	#define PNP_GET_APM_ID_TABLE 0x0b
235	#define PNP_GET_PNP_ISA_CONFIG_STRUC 0x40
236	#define PNP_GET_ESCD_INFO 0x41
237	#define PNP_READ_ESCD 0x42
238	#define PNP_WRITE_ESCD 0x43
239
240	/*
241	* Call PnP BIOS with function 0x00, "get number of system device nodes"
242	*/
243	static int __pnp_bios_dev_node_info(struct pnp_dev_node_info *data)
244	{
245	u16 status;
246	if (!pnp_bios_present())
247	return PNP_FUNCTION_NOT_SUPPORTED;
248	status = call_pnp_bios(PNP_GET_NUM_SYS_DEV_NODES, 0, PNP_TS1, 2, PNP_TS1, PNP_DS, 0, 0,
249	data, sizeof(struct pnp_dev_node_info), NULL, 0);
250	data->no_nodes &= 0xff;
251	return status;
252	}
253
254	int pnp_bios_dev_node_info(struct pnp_dev_node_info *data)
255	{
256	int status = __pnp_bios_dev_node_info( data );
257	if ( status )
258	pnpbios_print_status( "dev_node_info", status );
259	return status;
260	}
261
262	/*
263	* Note that some PnP BIOSes (e.g., on Sony Vaio laptops) die a horrible
264	* death if they are asked to access the "current" configuration.
265	* Therefore, if it's a matter of indifference, it's better to call
266	* get_dev_node() and set_dev_node() with boot=1 rather than with boot=0.
267	*/
268
269	/*
270	* Call PnP BIOS with function 0x01, "get system device node"
271	* Input: *nodenum = desired node,
272	* boot = whether to get nonvolatile boot (!=0)
273	* or volatile current (0) config
274	* Output: *nodenum=next node or 0xff if no more nodes
275	*/
276	static int __pnp_bios_get_dev_node(u8 nodenum, char boot, struct pnp_bios_node data)
277	{
278	u16 status;
5fe9fe3c	279	u16 tmp_nodenum;
1da177e4 LT	280	if (!pnp_bios_present())
	281	return PNP_FUNCTION_NOT_SUPPORTED;
	282	if ( !boot && pnpbios_dont_use_current_config )
	283	return PNP_FUNCTION_NOT_SUPPORTED;
5fe9fe3c	284	tmp_nodenum = *nodenum;
1da177e4	285	status = call_pnp_bios(PNP_GET_SYS_DEV_NODE, 0, PNP_TS1, 0, PNP_TS2, boot ? 2 : 1, PNP_DS, 0,
5fe9fe3c ZA	286	&tmp_nodenum, sizeof(tmp_nodenum), data, 65536);
5fe9fe3c ZA	287	*nodenum = tmp_nodenum;
1da177e4 LT	288	return status;
	289	}
	290
	291	int pnp_bios_get_dev_node(u8 nodenum, char boot, struct pnp_bios_node data)
	292	{
	293	int status;
	294	status = __pnp_bios_get_dev_node( nodenum, boot, data );
	295	if ( status )
	296	pnpbios_print_status( "get_dev_node", status );
	297	return status;
	298	}
	299
	300
	301	/*
	302	* Call PnP BIOS with function 0x02, "set system device node"
	303	* Input: *nodenum = desired node,
	304	* boot = whether to set nonvolatile boot (!=0)
	305	* or volatile current (0) config
	306	*/
	307	static int __pnp_bios_set_dev_node(u8 nodenum, char boot, struct pnp_bios_node *data)
	308	{
	309	u16 status;
	310	if (!pnp_bios_present())
	311	return PNP_FUNCTION_NOT_SUPPORTED;
	312	if ( !boot && pnpbios_dont_use_current_config )
	313	return PNP_FUNCTION_NOT_SUPPORTED;
	314	status = call_pnp_bios(PNP_SET_SYS_DEV_NODE, nodenum, 0, PNP_TS1, boot ? 2 : 1, PNP_DS, 0, 0,
	315	data, 65536, NULL, 0);
	316	return status;
	317	}
	318
	319	int pnp_bios_set_dev_node(u8 nodenum, char boot, struct pnp_bios_node *data)
	320	{
	321	int status;
	322	status = __pnp_bios_set_dev_node( nodenum, boot, data );
	323	if ( status ) {
	324	pnpbios_print_status( "set_dev_node", status );
	325	return status;
	326	}
	327	if ( !boot ) { /* Update devlist */
	328	status = pnp_bios_get_dev_node( &nodenum, boot, data );
	329	if ( status )
	330	return status;
	331	}
	332	return status;
	333	}
	334
	335	#if needed
	336	/*
	337	* Call PnP BIOS with function 0x03, "get event"
	338	*/
	339	static int pnp_bios_get_event(u16 *event)
	340	{
	341	u16 status;
	342	if (!pnp_bios_present())
	343	return PNP_FUNCTION_NOT_SUPPORTED;
	344	status = call_pnp_bios(PNP_GET_EVENT, 0, PNP_TS1, PNP_DS, 0, 0 ,0 ,0,
	345	event, sizeof(u16), NULL, 0);
	346	return status;
	347	}
	348	#endif
	349
	350	#if needed
	351	/*
352	* Call PnP BIOS with function 0x04, "send message"
353	*/
354	static int pnp_bios_send_message(u16 message)
355	{
356	u16 status;
357	if (!pnp_bios_present())
358	return PNP_FUNCTION_NOT_SUPPORTED;
359	status = call_pnp_bios(PNP_SEND_MESSAGE, message, PNP_DS, 0, 0, 0, 0, 0, 0, 0, 0, 0);
360	return status;
361	}
362	#endif
363
364	/*
365	* Call PnP BIOS with function 0x05, "get docking station information"
366	*/
367	int pnp_bios_dock_station_info(struct pnp_docking_station_info *data)
368	{
369	u16 status;
370	if (!pnp_bios_present())
371	return PNP_FUNCTION_NOT_SUPPORTED;
372	status = call_pnp_bios(PNP_GET_DOCKING_STATION_INFORMATION, 0, PNP_TS1, PNP_DS, 0, 0, 0, 0,
373	data, sizeof(struct pnp_docking_station_info), NULL, 0);
374	return status;
375	}
376
377	#if needed
378	/*
379	* Call PnP BIOS with function 0x09, "set statically allocated resource
380	* information"
381	*/
382	static int pnp_bios_set_stat_res(char *info)
383	{
384	u16 status;
385	if (!pnp_bios_present())
386	return PNP_FUNCTION_NOT_SUPPORTED;
387	status = call_pnp_bios(PNP_SET_STATIC_ALLOCED_RES_INFO, 0, PNP_TS1, PNP_DS, 0, 0, 0, 0,
388	info, ((u16 ) info), 0, 0);
389	return status;
390	}
391	#endif
392
393	/*
394	* Call PnP BIOS with function 0x0a, "get statically allocated resource
395	* information"
396	*/
397	static int __pnp_bios_get_stat_res(char *info)
398	{
399	u16 status;
400	if (!pnp_bios_present())
401	return PNP_FUNCTION_NOT_SUPPORTED;
402	status = call_pnp_bios(PNP_GET_STATIC_ALLOCED_RES_INFO, 0, PNP_TS1, PNP_DS, 0, 0, 0, 0,
403	info, 65536, NULL, 0);
404	return status;
405	}
406
407	int pnp_bios_get_stat_res(char *info)
408	{
409	int status;
410	status = __pnp_bios_get_stat_res( info );
411	if ( status )
412	pnpbios_print_status( "get_stat_res", status );
413	return status;
414	}
415
416	#if needed
417	/*
418	* Call PnP BIOS with function 0x0b, "get APM id table"
419	*/
420	static int pnp_bios_apm_id_table(char table, u16 size)
421	{
422	u16 status;
423	if (!pnp_bios_present())
424	return PNP_FUNCTION_NOT_SUPPORTED;
425	status = call_pnp_bios(PNP_GET_APM_ID_TABLE, 0, PNP_TS2, 0, PNP_TS1, PNP_DS, 0, 0,
426	table, *size, size, sizeof(u16));
427	return status;
428	}
429	#endif
430
431	/*
432	* Call PnP BIOS with function 0x40, "get isa pnp configuration structure"
433	*/
434	static int __pnp_bios_isapnp_config(struct pnp_isa_config_struc *data)
435	{
436	u16 status;
437	if (!pnp_bios_present())
438	return PNP_FUNCTION_NOT_SUPPORTED;
439	status = call_pnp_bios(PNP_GET_PNP_ISA_CONFIG_STRUC, 0, PNP_TS1, PNP_DS, 0, 0, 0, 0,
440	data, sizeof(struct pnp_isa_config_struc), NULL, 0);
441	return status;
442	}
443
444	int pnp_bios_isapnp_config(struct pnp_isa_config_struc *data)
445	{
446	int status;
447	status = __pnp_bios_isapnp_config( data );
448	if ( status )
449	pnpbios_print_status( "isapnp_config", status );
450	return status;
451	}
452
453	/*
454	* Call PnP BIOS with function 0x41, "get ESCD info"
455	*/
456	static int __pnp_bios_escd_info(struct escd_info_struc *data)
457	{
458	u16 status;
459	if (!pnp_bios_present())
460	return ESCD_FUNCTION_NOT_SUPPORTED;
461	status = call_pnp_bios(PNP_GET_ESCD_INFO, 0, PNP_TS1, 2, PNP_TS1, 4, PNP_TS1, PNP_DS,
462	data, sizeof(struct escd_info_struc), NULL, 0);
463	return status;
464	}
465
466	int pnp_bios_escd_info(struct escd_info_struc *data)
467	{
468	int status;
469	status = __pnp_bios_escd_info( data );
470	if ( status )
471	pnpbios_print_status( "escd_info", status );
472	return status;
473	}
474
475	/*
476	* Call PnP BIOS function 0x42, "read ESCD"
477	* nvram_base is determined by calling escd_info
478	*/
479	static int __pnp_bios_read_escd(char *data, u32 nvram_base)
480	{
481	u16 status;
482	if (!pnp_bios_present())
483	return ESCD_FUNCTION_NOT_SUPPORTED;
484	status = call_pnp_bios(PNP_READ_ESCD, 0, PNP_TS1, PNP_TS2, PNP_DS, 0, 0, 0,
485	data, 65536, __va(nvram_base), 65536);
486	return status;
487	}
488
489	int pnp_bios_read_escd(char *data, u32 nvram_base)
490	{
491	int status;
492	status = __pnp_bios_read_escd( data, nvram_base );
493	if ( status )
494	pnpbios_print_status( "read_escd", status );
495	return status;
496	}
497
498	#if needed
499	/*
500	* Call PnP BIOS function 0x43, "write ESCD"
501	*/
502	static int pnp_bios_write_escd(char *data, u32 nvram_base)
503	{
504	u16 status;
505	if (!pnp_bios_present())
506	return ESCD_FUNCTION_NOT_SUPPORTED;
507	status = call_pnp_bios(PNP_WRITE_ESCD, 0, PNP_TS1, PNP_TS2, PNP_DS, 0, 0, 0,
508	data, 65536, __va(nvram_base), 65536);
509	return status;
510	}
511	#endif
512
513
514	/*
515	* Initialization
516	*/
517
518	void pnpbios_calls_init(union pnp_bios_install_struct *header)
519	{
520	int i;
521	spin_lock_init(&pnp_bios_lock);
522	pnp_bios_callpoint.offset = header->fields.pm16offset;
523	pnp_bios_callpoint.segment = PNP_CS16;
524
525	set_base(bad_bios_desc, __va((unsigned long)0x40 << 4));
526	_set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4));
7c4cb60e ZA	527	for (i = 0; i < NR_CPUS; i++) {
	528	struct desc_struct *gdt = get_cpu_gdt_table(i);
	529	if (!gdt)
	530	continue;
e6a9918c ZA	531	set_base(gdt[GDT_ENTRY_PNPBIOS_CS32], &pnp_bios_callfunc);
	532	set_base(gdt[GDT_ENTRY_PNPBIOS_CS16], __va(header->fields.pm16cseg));
	533	set_base(gdt[GDT_ENTRY_PNPBIOS_DS], __va(header->fields.pm16dseg));
	534	}
1da177e4	535	}