[deliverable/linux.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 {
9dd78466 BH	29	u16 offset;
9dd78466 BH	30	u16 segment;
1da177e4 LT	31	} pnp_bios_callpoint;
1da177e4 LT	32
1da177e4 LT	33	/*
	34	* These are some opcodes for a "static asmlinkage"
	35	* As this code is not executed inside the linux kernel segment, but in a
	36	* alias at offset 0, we need a far return that can not be compiled by
	37	* default (please, prove me wrong! this is really ugly!)
	38	* This is the only way to get the bios to return into the kernel code,
	39	* because the bios code runs in 16 bit protected mode and therefore can only
	40	* return to the caller if the call is within the first 64kB, and the linux
	41	* kernel begins at offset 3GB...
	42	*/
	43
	44	asmlinkage void pnp_bios_callfunc(void);
	45
9dd78466	46	__asm__(".text \n"
1da177e4 LT	47	__ALIGN_STR "\n"
	48	"pnp_bios_callfunc:\n"
	49	" pushl %edx \n"
	50	" pushl %ecx \n"
	51	" pushl %ebx \n"
	52	" pushl %eax \n"
	53	" lcallw *pnp_bios_callpoint\n"
	54	" addl $16, %esp \n"
9dd78466	55	" lret \n" ".previous \n");
1da177e4	56
1da177e4 LT	57	#define Q2_SET_SEL(cpu, selname, address, size) \
1da177e4 LT	58	do { \
7c4cb60e ZA	59	struct desc_struct *gdt = get_cpu_gdt_table((cpu)); \
	60	set_base(gdt[(selname) >> 3], (u32)(address)); \
	61	set_limit(gdt[(selname) >> 3], size); \
1da177e4 LT	62	} while(0)
	63
	64	static struct desc_struct bad_bios_desc = { 0, 0x00409200 };
	65
	66	/*
	67	* At some point we want to use this stack frame pointer to unwind
	68	* after PnP BIOS oopses.
	69	*/
	70
	71	u32 pnp_bios_fault_esp;
	72	u32 pnp_bios_fault_eip;
	73	u32 pnp_bios_is_utter_crap = 0;
	74
	75	static spinlock_t pnp_bios_lock;
	76
1da177e4 LT	77	/*
	78	* Support Functions
	79	*/
	80
	81	static inline u16 call_pnp_bios(u16 func, u16 arg1, u16 arg2, u16 arg3,
	82	u16 arg4, u16 arg5, u16 arg6, u16 arg7,
	83	void *ts1_base, u32 ts1_size,
	84	void *ts2_base, u32 ts2_size)
	85	{
	86	unsigned long flags;
	87	u16 status;
	88	struct desc_struct save_desc_40;
	89	int cpu;
	90
	91	/*
	92	* PnP BIOSes are generally not terribly re-entrant.
	93	* Also, don't rely on them to save everything correctly.
	94	*/
9dd78466	95	if (pnp_bios_is_utter_crap)
1da177e4 LT	96	return PNP_FUNCTION_NOT_SUPPORTED;
	97
	98	cpu = get_cpu();
7c4cb60e ZA	99	save_desc_40 = get_cpu_gdt_table(cpu)[0x40 / 8];
7c4cb60e ZA	100	get_cpu_gdt_table(cpu)[0x40 / 8] = bad_bios_desc;
1da177e4 LT	101
	102	/* On some boxes IRQ's during PnP BIOS calls are deadly. */
	103	spin_lock_irqsave(&pnp_bios_lock, flags);
	104
	105	/* The lock prevents us bouncing CPU here */
	106	if (ts1_size)
	107	Q2_SET_SEL(smp_processor_id(), PNP_TS1, ts1_base, ts1_size);
	108	if (ts2_size)
	109	Q2_SET_SEL(smp_processor_id(), PNP_TS2, ts2_base, ts2_size);
	110
9dd78466 BH	111	__asm__ __volatile__("pushl %%ebp\n\t"
	112	"pushl %%edi\n\t"
	113	"pushl %%esi\n\t"
	114	"pushl %%ds\n\t"
	115	"pushl %%es\n\t"
	116	"pushl %%fs\n\t"
	117	"pushl %%gs\n\t"
	118	"pushfl\n\t"
	119	"movl %%esp, pnp_bios_fault_esp\n\t"
	120	"movl $1f, pnp_bios_fault_eip\n\t"
	121	"lcall %5,%6\n\t"
	122	"1:popfl\n\t"
	123	"popl %%gs\n\t"
	124	"popl %%fs\n\t"
	125	"popl %%es\n\t"
	126	"popl %%ds\n\t"
	127	"popl %%esi\n\t"
	128	"popl %%edi\n\t" "popl %%ebp\n\t":"=a"(status)
	129	:"0"((func) \| (((u32) arg1) << 16)),
	130	"b"((arg2) \| (((u32) arg3) << 16)),
	131	"c"((arg4) \| (((u32) arg5) << 16)),
	132	"d"((arg6) \| (((u32) arg7) << 16)),
	133	"i"(PNP_CS32), "i"(0)
	134	:"memory");
1da177e4 LT	135	spin_unlock_irqrestore(&pnp_bios_lock, flags);
1da177e4 LT	136
7c4cb60e	137	get_cpu_gdt_table(cpu)[0x40 / 8] = save_desc_40;
1da177e4 LT	138	put_cpu();
	139
	140	/* If we get here and this is set then the PnP BIOS faulted on us. */
9dd78466 BH	141	if (pnp_bios_is_utter_crap) {
	142	printk(KERN_ERR
	143	"PnPBIOS: Warning! Your PnP BIOS caused a fatal error. Attempting to continue\n");
	144	printk(KERN_ERR
	145	"PnPBIOS: You may need to reboot with the \"pnpbios=off\" option to operate stably\n");
	146	printk(KERN_ERR
	147	"PnPBIOS: Check with your vendor for an updated BIOS\n");
1da177e4 LT	148	}
	149
	150	return status;
	151	}
	152
9dd78466	153	void pnpbios_print_status(const char *module, u16 status)
1da177e4	154	{
9dd78466	155	switch (status) {
1da177e4 LT	156	case PNP_SUCCESS:
	157	printk(KERN_ERR "PnPBIOS: %s: function successful\n", module);
	158	break;
	159	case PNP_NOT_SET_STATICALLY:
9dd78466 BH	160	printk(KERN_ERR "PnPBIOS: %s: unable to set static resources\n",
9dd78466 BH	161	module);
1da177e4 LT	162	break;
1da177e4 LT	163	case PNP_UNKNOWN_FUNCTION:
9dd78466 BH	164	printk(KERN_ERR "PnPBIOS: %s: invalid function number passed\n",
9dd78466 BH	165	module);
1da177e4 LT	166	break;
1da177e4 LT	167	case PNP_FUNCTION_NOT_SUPPORTED:
9dd78466 BH	168	printk(KERN_ERR
	169	"PnPBIOS: %s: function not supported on this system\n",
	170	module);
1da177e4 LT	171	break;
	172	case PNP_INVALID_HANDLE:
	173	printk(KERN_ERR "PnPBIOS: %s: invalid handle\n", module);
	174	break;
	175	case PNP_BAD_PARAMETER:
9dd78466 BH	176	printk(KERN_ERR "PnPBIOS: %s: invalid parameters were passed\n",
9dd78466 BH	177	module);
1da177e4 LT	178	break;
1da177e4 LT	179	case PNP_SET_FAILED:
9dd78466 BH	180	printk(KERN_ERR "PnPBIOS: %s: unable to set resources\n",
9dd78466 BH	181	module);
1da177e4 LT	182	break;
	183	case PNP_EVENTS_NOT_PENDING:
	184	printk(KERN_ERR "PnPBIOS: %s: no events are pending\n", module);
	185	break;
	186	case PNP_SYSTEM_NOT_DOCKED:
9dd78466 BH	187	printk(KERN_ERR "PnPBIOS: %s: the system is not docked\n",
9dd78466 BH	188	module);
1da177e4 LT	189	break;
1da177e4 LT	190	case PNP_NO_ISA_PNP_CARDS:
9dd78466 BH	191	printk(KERN_ERR
	192	"PnPBIOS: %s: no isapnp cards are installed on this system\n",
	193	module);
1da177e4 LT	194	break;
1da177e4 LT	195	case PNP_UNABLE_TO_DETERMINE_DOCK_CAPABILITIES:
9dd78466 BH	196	printk(KERN_ERR
	197	"PnPBIOS: %s: cannot determine the capabilities of the docking station\n",
	198	module);
1da177e4 LT	199	break;
1da177e4 LT	200	case PNP_CONFIG_CHANGE_FAILED_NO_BATTERY:
9dd78466 BH	201	printk(KERN_ERR
	202	"PnPBIOS: %s: unable to undock, the system does not have a battery\n",
	203	module);
1da177e4 LT	204	break;
1da177e4 LT	205	case PNP_CONFIG_CHANGE_FAILED_RESOURCE_CONFLICT:
9dd78466 BH	206	printk(KERN_ERR
	207	"PnPBIOS: %s: could not dock due to resource conflicts\n",
	208	module);
1da177e4 LT	209	break;
1da177e4 LT	210	case PNP_BUFFER_TOO_SMALL:
9dd78466 BH	211	printk(KERN_ERR "PnPBIOS: %s: the buffer passed is too small\n",
9dd78466 BH	212	module);
1da177e4 LT	213	break;
	214	case PNP_USE_ESCD_SUPPORT:
	215	printk(KERN_ERR "PnPBIOS: %s: use ESCD instead\n", module);
	216	break;
	217	case PNP_MESSAGE_NOT_SUPPORTED:
9dd78466 BH	218	printk(KERN_ERR "PnPBIOS: %s: the message is unsupported\n",
9dd78466 BH	219	module);
1da177e4 LT	220	break;
1da177e4 LT	221	case PNP_HARDWARE_ERROR:
9dd78466 BH	222	printk(KERN_ERR "PnPBIOS: %s: a hardware failure has occured\n",
9dd78466 BH	223	module);
1da177e4 LT	224	break;
1da177e4 LT	225	default:
9dd78466 BH	226	printk(KERN_ERR "PnPBIOS: %s: unexpected status 0x%x\n", module,
9dd78466 BH	227	status);
1da177e4 LT	228	break;
	229	}
	230	}
	231
1da177e4 LT	232	/*
	233	* PnP BIOS Low Level Calls
	234	*/
	235
	236	#define PNP_GET_NUM_SYS_DEV_NODES 0x00
	237	#define PNP_GET_SYS_DEV_NODE 0x01
	238	#define PNP_SET_SYS_DEV_NODE 0x02
	239	#define PNP_GET_EVENT 0x03
	240	#define PNP_SEND_MESSAGE 0x04
	241	#define PNP_GET_DOCKING_STATION_INFORMATION 0x05
	242	#define PNP_SET_STATIC_ALLOCED_RES_INFO 0x09
	243	#define PNP_GET_STATIC_ALLOCED_RES_INFO 0x0a
	244	#define PNP_GET_APM_ID_TABLE 0x0b
	245	#define PNP_GET_PNP_ISA_CONFIG_STRUC 0x40
	246	#define PNP_GET_ESCD_INFO 0x41
	247	#define PNP_READ_ESCD 0x42
	248	#define PNP_WRITE_ESCD 0x43
	249
	250	/*
	251	* Call PnP BIOS with function 0x00, "get number of system device nodes"
	252	*/
	253	static int __pnp_bios_dev_node_info(struct pnp_dev_node_info *data)
	254	{
	255	u16 status;
	256	if (!pnp_bios_present())
	257	return PNP_FUNCTION_NOT_SUPPORTED;
9dd78466 BH	258	status =
	259	call_pnp_bios(PNP_GET_NUM_SYS_DEV_NODES, 0, PNP_TS1, 2, PNP_TS1,
	260	PNP_DS, 0, 0, data, sizeof(struct pnp_dev_node_info),
	261	NULL, 0);
1da177e4 LT	262	data->no_nodes &= 0xff;
	263	return status;
	264	}
	265
	266	int pnp_bios_dev_node_info(struct pnp_dev_node_info *data)
	267	{
9dd78466 BH	268	int status = __pnp_bios_dev_node_info(data);
	269	if (status)
	270	pnpbios_print_status("dev_node_info", status);
1da177e4 LT	271	return status;
	272	}
	273
	274	/*
	275	* Note that some PnP BIOSes (e.g., on Sony Vaio laptops) die a horrible
	276	* death if they are asked to access the "current" configuration.
	277	* Therefore, if it's a matter of indifference, it's better to call
	278	* get_dev_node() and set_dev_node() with boot=1 rather than with boot=0.
	279	*/
	280
	281	/*
	282	* Call PnP BIOS with function 0x01, "get system device node"
	283	* Input: *nodenum = desired node,
	284	* boot = whether to get nonvolatile boot (!=0)
	285	* or volatile current (0) config
	286	* Output: *nodenum=next node or 0xff if no more nodes
	287	*/
9dd78466 BH	288	static int __pnp_bios_get_dev_node(u8 * nodenum, char boot,
9dd78466 BH	289	struct pnp_bios_node *data)
1da177e4 LT	290	{
1da177e4 LT	291	u16 status;
5fe9fe3c	292	u16 tmp_nodenum;
1da177e4 LT	293	if (!pnp_bios_present())
1da177e4 LT	294	return PNP_FUNCTION_NOT_SUPPORTED;
9dd78466	295	if (!boot && pnpbios_dont_use_current_config)
1da177e4	296	return PNP_FUNCTION_NOT_SUPPORTED;
5fe9fe3c	297	tmp_nodenum = *nodenum;
9dd78466 BH	298	status =
	299	call_pnp_bios(PNP_GET_SYS_DEV_NODE, 0, PNP_TS1, 0, PNP_TS2,
	300	boot ? 2 : 1, PNP_DS, 0, &tmp_nodenum,
	301	sizeof(tmp_nodenum), data, 65536);
5fe9fe3c	302	*nodenum = tmp_nodenum;
1da177e4 LT	303	return status;
	304	}
	305
9dd78466	306	int pnp_bios_get_dev_node(u8 * nodenum, char boot, struct pnp_bios_node *data)
1da177e4 LT	307	{
1da177e4 LT	308	int status;
9dd78466 BH	309	status = __pnp_bios_get_dev_node(nodenum, boot, data);
	310	if (status)
	311	pnpbios_print_status("get_dev_node", status);
1da177e4 LT	312	return status;
	313	}
	314
1da177e4 LT	315	/*
	316	* Call PnP BIOS with function 0x02, "set system device node"
	317	* Input: *nodenum = desired node,
	318	* boot = whether to set nonvolatile boot (!=0)
	319	* or volatile current (0) config
	320	*/
9dd78466 BH	321	static int __pnp_bios_set_dev_node(u8 nodenum, char boot,
9dd78466 BH	322	struct pnp_bios_node *data)
1da177e4 LT	323	{
	324	u16 status;
	325	if (!pnp_bios_present())
	326	return PNP_FUNCTION_NOT_SUPPORTED;
9dd78466	327	if (!boot && pnpbios_dont_use_current_config)
1da177e4	328	return PNP_FUNCTION_NOT_SUPPORTED;
9dd78466 BH	329	status =
	330	call_pnp_bios(PNP_SET_SYS_DEV_NODE, nodenum, 0, PNP_TS1,
	331	boot ? 2 : 1, PNP_DS, 0, 0, data, 65536, NULL, 0);
1da177e4 LT	332	return status;
	333	}
	334
	335	int pnp_bios_set_dev_node(u8 nodenum, char boot, struct pnp_bios_node *data)
	336	{
	337	int status;
9dd78466 BH	338	status = __pnp_bios_set_dev_node(nodenum, boot, data);
	339	if (status) {
	340	pnpbios_print_status("set_dev_node", status);
1da177e4 LT	341	return status;
1da177e4 LT	342	}
9dd78466 BH	343	if (!boot) { /* Update devlist */
	344	status = pnp_bios_get_dev_node(&nodenum, boot, data);
	345	if (status)
1da177e4 LT	346	return status;
	347	}
	348	return status;
	349	}
	350
	351	#if needed
	352	/*
	353	* Call PnP BIOS with function 0x03, "get event"
	354	*/
9dd78466	355	static int pnp_bios_get_event(u16 * event)
1da177e4 LT	356	{
	357	u16 status;
	358	if (!pnp_bios_present())
	359	return PNP_FUNCTION_NOT_SUPPORTED;
9dd78466	360	status = call_pnp_bios(PNP_GET_EVENT, 0, PNP_TS1, PNP_DS, 0, 0, 0, 0,
1da177e4 LT	361	event, sizeof(u16), NULL, 0);
	362	return status;
	363	}
	364	#endif
	365
	366	#if needed
	367	/*
	368	* Call PnP BIOS with function 0x04, "send message"
	369	*/
	370	static int pnp_bios_send_message(u16 message)
	371	{
	372	u16 status;
	373	if (!pnp_bios_present())
	374	return PNP_FUNCTION_NOT_SUPPORTED;
9dd78466 BH	375	status =
	376	call_pnp_bios(PNP_SEND_MESSAGE, message, PNP_DS, 0, 0, 0, 0, 0, 0,
	377	0, 0, 0);
1da177e4 LT	378	return status;
	379	}
	380	#endif
	381
	382	/*
	383	* Call PnP BIOS with function 0x05, "get docking station information"
	384	*/
	385	int pnp_bios_dock_station_info(struct pnp_docking_station_info *data)
	386	{
	387	u16 status;
	388	if (!pnp_bios_present())
	389	return PNP_FUNCTION_NOT_SUPPORTED;
9dd78466 BH	390	status =
	391	call_pnp_bios(PNP_GET_DOCKING_STATION_INFORMATION, 0, PNP_TS1,
	392	PNP_DS, 0, 0, 0, 0, data,
	393	sizeof(struct pnp_docking_station_info), NULL, 0);
1da177e4 LT	394	return status;
	395	}
	396
	397	#if needed
	398	/*
	399	* Call PnP BIOS with function 0x09, "set statically allocated resource
	400	* information"
	401	*/
	402	static int pnp_bios_set_stat_res(char *info)
	403	{
	404	u16 status;
	405	if (!pnp_bios_present())
	406	return PNP_FUNCTION_NOT_SUPPORTED;
9dd78466 BH	407	status =
	408	call_pnp_bios(PNP_SET_STATIC_ALLOCED_RES_INFO, 0, PNP_TS1, PNP_DS,
	409	0, 0, 0, 0, info, ((u16 ) info), 0, 0);
1da177e4 LT	410	return status;
	411	}
	412	#endif
	413
	414	/*
	415	* Call PnP BIOS with function 0x0a, "get statically allocated resource
	416	* information"
	417	*/
	418	static int __pnp_bios_get_stat_res(char *info)
	419	{
	420	u16 status;
	421	if (!pnp_bios_present())
	422	return PNP_FUNCTION_NOT_SUPPORTED;
9dd78466 BH	423	status =
	424	call_pnp_bios(PNP_GET_STATIC_ALLOCED_RES_INFO, 0, PNP_TS1, PNP_DS,
	425	0, 0, 0, 0, info, 65536, NULL, 0);
1da177e4 LT	426	return status;
	427	}
	428
	429	int pnp_bios_get_stat_res(char *info)
	430	{
	431	int status;
9dd78466 BH	432	status = __pnp_bios_get_stat_res(info);
	433	if (status)
	434	pnpbios_print_status("get_stat_res", status);
1da177e4 LT	435	return status;
	436	}
	437
	438	#if needed
	439	/*
	440	* Call PnP BIOS with function 0x0b, "get APM id table"
	441	*/
9dd78466	442	static int pnp_bios_apm_id_table(char table, u16 size)
1da177e4 LT	443	{
	444	u16 status;
	445	if (!pnp_bios_present())
	446	return PNP_FUNCTION_NOT_SUPPORTED;
9dd78466 BH	447	status =
	448	call_pnp_bios(PNP_GET_APM_ID_TABLE, 0, PNP_TS2, 0, PNP_TS1, PNP_DS,
	449	0, 0, table, *size, size, sizeof(u16));
1da177e4 LT	450	return status;
	451	}
	452	#endif
	453
	454	/*
	455	* Call PnP BIOS with function 0x40, "get isa pnp configuration structure"
	456	*/
	457	static int __pnp_bios_isapnp_config(struct pnp_isa_config_struc *data)
	458	{
	459	u16 status;
	460	if (!pnp_bios_present())
	461	return PNP_FUNCTION_NOT_SUPPORTED;
9dd78466 BH	462	status =
	463	call_pnp_bios(PNP_GET_PNP_ISA_CONFIG_STRUC, 0, PNP_TS1, PNP_DS, 0,
	464	0, 0, 0, data, sizeof(struct pnp_isa_config_struc),
	465	NULL, 0);
1da177e4 LT	466	return status;
	467	}
	468
	469	int pnp_bios_isapnp_config(struct pnp_isa_config_struc *data)
	470	{
	471	int status;
9dd78466 BH	472	status = __pnp_bios_isapnp_config(data);
	473	if (status)
	474	pnpbios_print_status("isapnp_config", status);
1da177e4 LT	475	return status;
	476	}
	477
	478	/*
	479	* Call PnP BIOS with function 0x41, "get ESCD info"
	480	*/
	481	static int __pnp_bios_escd_info(struct escd_info_struc *data)
	482	{
	483	u16 status;
	484	if (!pnp_bios_present())
	485	return ESCD_FUNCTION_NOT_SUPPORTED;
9dd78466 BH	486	status =
	487	call_pnp_bios(PNP_GET_ESCD_INFO, 0, PNP_TS1, 2, PNP_TS1, 4, PNP_TS1,
	488	PNP_DS, data, sizeof(struct escd_info_struc), NULL,
	489	0);
1da177e4 LT	490	return status;
	491	}
	492
	493	int pnp_bios_escd_info(struct escd_info_struc *data)
	494	{
	495	int status;
9dd78466 BH	496	status = __pnp_bios_escd_info(data);
	497	if (status)
	498	pnpbios_print_status("escd_info", status);
1da177e4 LT	499	return status;
	500	}
	501
	502	/*
	503	* Call PnP BIOS function 0x42, "read ESCD"
	504	* nvram_base is determined by calling escd_info
	505	*/
	506	static int __pnp_bios_read_escd(char *data, u32 nvram_base)
	507	{
	508	u16 status;
	509	if (!pnp_bios_present())
	510	return ESCD_FUNCTION_NOT_SUPPORTED;
9dd78466 BH	511	status =
	512	call_pnp_bios(PNP_READ_ESCD, 0, PNP_TS1, PNP_TS2, PNP_DS, 0, 0, 0,
	513	data, 65536, __va(nvram_base), 65536);
1da177e4 LT	514	return status;
	515	}
	516
	517	int pnp_bios_read_escd(char *data, u32 nvram_base)
	518	{
	519	int status;
9dd78466 BH	520	status = __pnp_bios_read_escd(data, nvram_base);
	521	if (status)
	522	pnpbios_print_status("read_escd", status);
1da177e4 LT	523	return status;
	524	}
	525
	526	#if needed
	527	/*
	528	* Call PnP BIOS function 0x43, "write ESCD"
	529	*/
	530	static int pnp_bios_write_escd(char *data, u32 nvram_base)
	531	{
	532	u16 status;
	533	if (!pnp_bios_present())
	534	return ESCD_FUNCTION_NOT_SUPPORTED;
9dd78466 BH	535	status =
	536	call_pnp_bios(PNP_WRITE_ESCD, 0, PNP_TS1, PNP_TS2, PNP_DS, 0, 0, 0,
	537	data, 65536, __va(nvram_base), 65536);
1da177e4 LT	538	return status;
	539	}
	540	#endif
	541
1da177e4 LT	542	/*
	543	* Initialization
	544	*/
	545
	546	void pnpbios_calls_init(union pnp_bios_install_struct *header)
	547	{
	548	int i;
	549	spin_lock_init(&pnp_bios_lock);
	550	pnp_bios_callpoint.offset = header->fields.pm16offset;
	551	pnp_bios_callpoint.segment = PNP_CS16;
	552
	553	set_base(bad_bios_desc, __va((unsigned long)0x40 << 4));
	554	_set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4));
9dd78466 BH	555	for (i = 0; i < NR_CPUS; i++) {
	556	struct desc_struct *gdt = get_cpu_gdt_table(i);
	557	if (!gdt)
	558	continue;
	559	set_base(gdt[GDT_ENTRY_PNPBIOS_CS32], &pnp_bios_callfunc);
	560	set_base(gdt[GDT_ENTRY_PNPBIOS_CS16],
	561	__va(header->fields.pm16cseg));
	562	set_base(gdt[GDT_ENTRY_PNPBIOS_DS],
	563	__va(header->fields.pm16dseg));
	564	}
1da177e4	565	}