[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/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"

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_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.
 */

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 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_table(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));
	}
}
Commit	Line	Data
1da177e4 LT	1	/*
1da177e4 LT	2	* bioscalls.c - the lowlevel layer of the PnPBIOS driver
1da177e4 LT	3	*/
	4
	5	#include <linux/types.h>
	6	#include <linux/module.h>
	7	#include <linux/init.h>
	8	#include <linux/linkage.h>
	9	#include <linux/kernel.h>
1da177e4 LT	10	#include <linux/device.h>
	11	#include <linux/pnp.h>
	12	#include <linux/mm.h>
	13	#include <linux/smp.h>
1da177e4 LT	14	#include <linux/kmod.h>
	15	#include <linux/completion.h>
	16	#include <linux/spinlock.h>
	17
	18	#include <asm/page.h>
	19	#include <asm/desc.h>
1da177e4 LT	20	#include <asm/byteorder.h>
	21
	22	#include "pnpbios.h"
	23
	24	static struct {
9dd78466 BH	25	u16 offset;
9dd78466 BH	26	u16 segment;
1da177e4 LT	27	} pnp_bios_callpoint;
1da177e4 LT	28
1da177e4 LT	29	/*
	30	* These are some opcodes for a "static asmlinkage"
	31	* As this code is not executed inside the linux kernel segment, but in a
	32	* alias at offset 0, we need a far return that can not be compiled by
	33	* default (please, prove me wrong! this is really ugly!)
	34	* This is the only way to get the bios to return into the kernel code,
	35	* because the bios code runs in 16 bit protected mode and therefore can only
	36	* return to the caller if the call is within the first 64kB, and the linux
	37	* kernel begins at offset 3GB...
	38	*/
	39
	40	asmlinkage void pnp_bios_callfunc(void);
	41
9dd78466	42	__asm__(".text \n"
1da177e4 LT	43	__ALIGN_STR "\n"
	44	"pnp_bios_callfunc:\n"
	45	" pushl %edx \n"
	46	" pushl %ecx \n"
	47	" pushl %ebx \n"
	48	" pushl %eax \n"
	49	" lcallw *pnp_bios_callpoint\n"
	50	" addl $16, %esp \n"
07d4e9af BH	51	" lret \n"
07d4e9af BH	52	".previous \n");
1da177e4	53
1da177e4 LT	54	#define Q2_SET_SEL(cpu, selname, address, size) \
1da177e4 LT	55	do { \
57594742 AM	56	struct desc_struct *gdt = get_cpu_gdt_table((cpu)); \
	57	set_desc_base(&gdt[(selname) >> 3], (u32)(address)); \
	58	set_desc_limit(&gdt[(selname) >> 3], (size) - 1); \
1da177e4 LT	59	} while(0)
1da177e4 LT	60
c7425314 AM	61	static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092,
c7425314 AM	62	(unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1);
1da177e4 LT	63
	64	/*
	65	* At some point we want to use this stack frame pointer to unwind
	66	* after PnP BIOS oopses.
	67	*/
	68
	69	u32 pnp_bios_fault_esp;
	70	u32 pnp_bios_fault_eip;
	71	u32 pnp_bios_is_utter_crap = 0;
	72
	73	static spinlock_t pnp_bios_lock;
	74
1da177e4 LT	75	/*
	76	* Support Functions
	77	*/
	78
	79	static inline u16 call_pnp_bios(u16 func, u16 arg1, u16 arg2, u16 arg3,
	80	u16 arg4, u16 arg5, u16 arg6, u16 arg7,
	81	void *ts1_base, u32 ts1_size,
	82	void *ts2_base, u32 ts2_size)
	83	{
	84	unsigned long flags;
	85	u16 status;
	86	struct desc_struct save_desc_40;
	87	int cpu;
	88
	89	/*
	90	* PnP BIOSes are generally not terribly re-entrant.
	91	* Also, don't rely on them to save everything correctly.
	92	*/
9dd78466	93	if (pnp_bios_is_utter_crap)
1da177e4 LT	94	return PNP_FUNCTION_NOT_SUPPORTED;
	95
	96	cpu = get_cpu();
7c4cb60e ZA	97	save_desc_40 = get_cpu_gdt_table(cpu)[0x40 / 8];
7c4cb60e ZA	98	get_cpu_gdt_table(cpu)[0x40 / 8] = bad_bios_desc;
1da177e4 LT	99
	100	/* On some boxes IRQ's during PnP BIOS calls are deadly. */
	101	spin_lock_irqsave(&pnp_bios_lock, flags);
	102
	103	/* The lock prevents us bouncing CPU here */
	104	if (ts1_size)
	105	Q2_SET_SEL(smp_processor_id(), PNP_TS1, ts1_base, ts1_size);
	106	if (ts2_size)
	107	Q2_SET_SEL(smp_processor_id(), PNP_TS2, ts2_base, ts2_size);
	108
9dd78466 BH	109	__asm__ __volatile__("pushl %%ebp\n\t"
	110	"pushl %%edi\n\t"
	111	"pushl %%esi\n\t"
	112	"pushl %%ds\n\t"
	113	"pushl %%es\n\t"
	114	"pushl %%fs\n\t"
	115	"pushl %%gs\n\t"
	116	"pushfl\n\t"
	117	"movl %%esp, pnp_bios_fault_esp\n\t"
	118	"movl $1f, pnp_bios_fault_eip\n\t"
	119	"lcall %5,%6\n\t"
	120	"1:popfl\n\t"
	121	"popl %%gs\n\t"
	122	"popl %%fs\n\t"
	123	"popl %%es\n\t"
	124	"popl %%ds\n\t"
	125	"popl %%esi\n\t"
07d4e9af BH	126	"popl %%edi\n\t"
07d4e9af BH	127	"popl %%ebp\n\t":"=a"(status)
9dd78466 BH	128	:"0"((func) \| (((u32) arg1) << 16)),
	129	"b"((arg2) \| (((u32) arg3) << 16)),
	130	"c"((arg4) \| (((u32) arg5) << 16)),
	131	"d"((arg6) \| (((u32) arg7) << 16)),
	132	"i"(PNP_CS32), "i"(0)
	133	:"memory");
1da177e4 LT	134	spin_unlock_irqrestore(&pnp_bios_lock, flags);
1da177e4 LT	135
7c4cb60e	136	get_cpu_gdt_table(cpu)[0x40 / 8] = save_desc_40;
1da177e4 LT	137	put_cpu();
	138
	139	/* If we get here and this is set then the PnP BIOS faulted on us. */
9dd78466 BH	140	if (pnp_bios_is_utter_crap) {
	141	printk(KERN_ERR
	142	"PnPBIOS: Warning! Your PnP BIOS caused a fatal error. Attempting to continue\n");
	143	printk(KERN_ERR
	144	"PnPBIOS: You may need to reboot with the \"pnpbios=off\" option to operate stably\n");
	145	printk(KERN_ERR
	146	"PnPBIOS: Check with your vendor for an updated BIOS\n");
1da177e4 LT	147	}
	148
	149	return status;
	150	}
	151
9dd78466	152	void pnpbios_print_status(const char *module, u16 status)
1da177e4	153	{
9dd78466	154	switch (status) {
1da177e4 LT	155	case PNP_SUCCESS:
	156	printk(KERN_ERR "PnPBIOS: %s: function successful\n", module);
	157	break;
	158	case PNP_NOT_SET_STATICALLY:
9dd78466 BH	159	printk(KERN_ERR "PnPBIOS: %s: unable to set static resources\n",
9dd78466 BH	160	module);
1da177e4 LT	161	break;
1da177e4 LT	162	case PNP_UNKNOWN_FUNCTION:
9dd78466 BH	163	printk(KERN_ERR "PnPBIOS: %s: invalid function number passed\n",
9dd78466 BH	164	module);
1da177e4 LT	165	break;
1da177e4 LT	166	case PNP_FUNCTION_NOT_SUPPORTED:
9dd78466 BH	167	printk(KERN_ERR
	168	"PnPBIOS: %s: function not supported on this system\n",
	169	module);
1da177e4 LT	170	break;
	171	case PNP_INVALID_HANDLE:
	172	printk(KERN_ERR "PnPBIOS: %s: invalid handle\n", module);
	173	break;
	174	case PNP_BAD_PARAMETER:
9dd78466 BH	175	printk(KERN_ERR "PnPBIOS: %s: invalid parameters were passed\n",
9dd78466 BH	176	module);
1da177e4 LT	177	break;
1da177e4 LT	178	case PNP_SET_FAILED:
9dd78466 BH	179	printk(KERN_ERR "PnPBIOS: %s: unable to set resources\n",
9dd78466 BH	180	module);
1da177e4 LT	181	break;
	182	case PNP_EVENTS_NOT_PENDING:
	183	printk(KERN_ERR "PnPBIOS: %s: no events are pending\n", module);
	184	break;
	185	case PNP_SYSTEM_NOT_DOCKED:
9dd78466 BH	186	printk(KERN_ERR "PnPBIOS: %s: the system is not docked\n",
9dd78466 BH	187	module);
1da177e4 LT	188	break;
1da177e4 LT	189	case PNP_NO_ISA_PNP_CARDS:
9dd78466 BH	190	printk(KERN_ERR
	191	"PnPBIOS: %s: no isapnp cards are installed on this system\n",
	192	module);
1da177e4 LT	193	break;
1da177e4 LT	194	case PNP_UNABLE_TO_DETERMINE_DOCK_CAPABILITIES:
9dd78466 BH	195	printk(KERN_ERR
	196	"PnPBIOS: %s: cannot determine the capabilities of the docking station\n",
	197	module);
1da177e4 LT	198	break;
1da177e4 LT	199	case PNP_CONFIG_CHANGE_FAILED_NO_BATTERY:
9dd78466 BH	200	printk(KERN_ERR
	201	"PnPBIOS: %s: unable to undock, the system does not have a battery\n",
	202	module);
1da177e4 LT	203	break;
1da177e4 LT	204	case PNP_CONFIG_CHANGE_FAILED_RESOURCE_CONFLICT:
9dd78466 BH	205	printk(KERN_ERR
	206	"PnPBIOS: %s: could not dock due to resource conflicts\n",
	207	module);
1da177e4 LT	208	break;
1da177e4 LT	209	case PNP_BUFFER_TOO_SMALL:
9dd78466 BH	210	printk(KERN_ERR "PnPBIOS: %s: the buffer passed is too small\n",
9dd78466 BH	211	module);
1da177e4 LT	212	break;
	213	case PNP_USE_ESCD_SUPPORT:
	214	printk(KERN_ERR "PnPBIOS: %s: use ESCD instead\n", module);
	215	break;
	216	case PNP_MESSAGE_NOT_SUPPORTED:
9dd78466 BH	217	printk(KERN_ERR "PnPBIOS: %s: the message is unsupported\n",
9dd78466 BH	218	module);
1da177e4 LT	219	break;
1da177e4 LT	220	case PNP_HARDWARE_ERROR:
25985edc	221	printk(KERN_ERR "PnPBIOS: %s: a hardware failure has occurred\n",
9dd78466	222	module);
1da177e4 LT	223	break;
1da177e4 LT	224	default:
9dd78466 BH	225	printk(KERN_ERR "PnPBIOS: %s: unexpected status 0x%x\n", module,
9dd78466 BH	226	status);
1da177e4 LT	227	break;
	228	}
	229	}
	230
1da177e4 LT	231	/*
	232	* PnP BIOS Low Level Calls
	233	*/
	234
	235	#define PNP_GET_NUM_SYS_DEV_NODES 0x00
	236	#define PNP_GET_SYS_DEV_NODE 0x01
	237	#define PNP_SET_SYS_DEV_NODE 0x02
	238	#define PNP_GET_EVENT 0x03
	239	#define PNP_SEND_MESSAGE 0x04
	240	#define PNP_GET_DOCKING_STATION_INFORMATION 0x05
	241	#define PNP_SET_STATIC_ALLOCED_RES_INFO 0x09
	242	#define PNP_GET_STATIC_ALLOCED_RES_INFO 0x0a
	243	#define PNP_GET_APM_ID_TABLE 0x0b
	244	#define PNP_GET_PNP_ISA_CONFIG_STRUC 0x40
	245	#define PNP_GET_ESCD_INFO 0x41
	246	#define PNP_READ_ESCD 0x42
	247	#define PNP_WRITE_ESCD 0x43
	248
	249	/*
	250	* Call PnP BIOS with function 0x00, "get number of system device nodes"
	251	*/
	252	static int __pnp_bios_dev_node_info(struct pnp_dev_node_info *data)
	253	{
	254	u16 status;
07d4e9af	255
1da177e4 LT	256	if (!pnp_bios_present())
1da177e4 LT	257	return PNP_FUNCTION_NOT_SUPPORTED;
07d4e9af BH	258	status = call_pnp_bios(PNP_GET_NUM_SYS_DEV_NODES, 0, PNP_TS1, 2,
	259	PNP_TS1, PNP_DS, 0, 0, data,
	260	sizeof(struct pnp_dev_node_info), NULL, 0);
1da177e4 LT	261	data->no_nodes &= 0xff;
	262	return status;
	263	}
	264
	265	int pnp_bios_dev_node_info(struct pnp_dev_node_info *data)
	266	{
9dd78466	267	int status = __pnp_bios_dev_node_info(data);
07d4e9af	268
9dd78466 BH	269	if (status)
9dd78466 BH	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	*/
07d4e9af	288	static int __pnp_bios_get_dev_node(u8 *nodenum, char boot,
9dd78466	289	struct pnp_bios_node *data)
1da177e4 LT	290	{
1da177e4 LT	291	u16 status;
5fe9fe3c	292	u16 tmp_nodenum;
07d4e9af	293
1da177e4 LT	294	if (!pnp_bios_present())
1da177e4 LT	295	return PNP_FUNCTION_NOT_SUPPORTED;
9dd78466	296	if (!boot && pnpbios_dont_use_current_config)
1da177e4	297	return PNP_FUNCTION_NOT_SUPPORTED;
5fe9fe3c	298	tmp_nodenum = *nodenum;
07d4e9af BH	299	status = 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
07d4e9af	306	int pnp_bios_get_dev_node(u8 nodenum, char boot, struct pnp_bios_node data)
1da177e4 LT	307	{
1da177e4 LT	308	int status;
07d4e9af	309
9dd78466 BH	310	status = __pnp_bios_get_dev_node(nodenum, boot, data);
	311	if (status)
	312	pnpbios_print_status("get_dev_node", status);
1da177e4 LT	313	return status;
	314	}
	315
1da177e4 LT	316	/*
	317	* Call PnP BIOS with function 0x02, "set system device node"
	318	* Input: *nodenum = desired node,
	319	* boot = whether to set nonvolatile boot (!=0)
	320	* or volatile current (0) config
	321	*/
9dd78466 BH	322	static int __pnp_bios_set_dev_node(u8 nodenum, char boot,
9dd78466 BH	323	struct pnp_bios_node *data)
1da177e4 LT	324	{
1da177e4 LT	325	u16 status;
07d4e9af	326
1da177e4 LT	327	if (!pnp_bios_present())
1da177e4 LT	328	return PNP_FUNCTION_NOT_SUPPORTED;
9dd78466	329	if (!boot && pnpbios_dont_use_current_config)
1da177e4	330	return PNP_FUNCTION_NOT_SUPPORTED;
07d4e9af BH	331	status = call_pnp_bios(PNP_SET_SYS_DEV_NODE, nodenum, 0, PNP_TS1,
	332	boot ? 2 : 1, PNP_DS, 0, 0, data, 65536, NULL,
	333	0);
1da177e4 LT	334	return status;
	335	}
	336
	337	int pnp_bios_set_dev_node(u8 nodenum, char boot, struct pnp_bios_node *data)
	338	{
	339	int status;
07d4e9af	340
9dd78466 BH	341	status = __pnp_bios_set_dev_node(nodenum, boot, data);
	342	if (status) {
	343	pnpbios_print_status("set_dev_node", status);
1da177e4 LT	344	return status;
1da177e4 LT	345	}
9dd78466 BH	346	if (!boot) { /* Update devlist */
	347	status = pnp_bios_get_dev_node(&nodenum, boot, data);
	348	if (status)
1da177e4 LT	349	return status;
	350	}
	351	return status;
	352	}
	353
1da177e4 LT	354	/*
	355	* Call PnP BIOS with function 0x05, "get docking station information"
	356	*/
	357	int pnp_bios_dock_station_info(struct pnp_docking_station_info *data)
	358	{
	359	u16 status;
1da177e4	360
1da177e4 LT	361	if (!pnp_bios_present())
1da177e4 LT	362	return PNP_FUNCTION_NOT_SUPPORTED;
07d4e9af BH	363	status = call_pnp_bios(PNP_GET_DOCKING_STATION_INFORMATION, 0, PNP_TS1,
	364	PNP_DS, 0, 0, 0, 0, data,
	365	sizeof(struct pnp_docking_station_info), NULL,
	366	0);
1da177e4 LT	367	return status;
1da177e4 LT	368	}
1da177e4 LT	369
	370	/*
	371	* Call PnP BIOS with function 0x0a, "get statically allocated resource
	372	* information"
	373	*/
	374	static int __pnp_bios_get_stat_res(char *info)
	375	{
	376	u16 status;
07d4e9af	377
1da177e4 LT	378	if (!pnp_bios_present())
1da177e4 LT	379	return PNP_FUNCTION_NOT_SUPPORTED;
07d4e9af BH	380	status = call_pnp_bios(PNP_GET_STATIC_ALLOCED_RES_INFO, 0, PNP_TS1,
07d4e9af BH	381	PNP_DS, 0, 0, 0, 0, info, 65536, NULL, 0);
1da177e4 LT	382	return status;
	383	}
	384
	385	int pnp_bios_get_stat_res(char *info)
	386	{
	387	int status;
07d4e9af	388
9dd78466 BH	389	status = __pnp_bios_get_stat_res(info);
	390	if (status)
	391	pnpbios_print_status("get_stat_res", status);
1da177e4 LT	392	return status;
	393	}
	394
1da177e4 LT	395	/*
	396	* Call PnP BIOS with function 0x40, "get isa pnp configuration structure"
	397	*/
	398	static int __pnp_bios_isapnp_config(struct pnp_isa_config_struc *data)
	399	{
	400	u16 status;
07d4e9af	401
1da177e4 LT	402	if (!pnp_bios_present())
1da177e4 LT	403	return PNP_FUNCTION_NOT_SUPPORTED;
07d4e9af BH	404	status = call_pnp_bios(PNP_GET_PNP_ISA_CONFIG_STRUC, 0, PNP_TS1, PNP_DS,
	405	0, 0, 0, 0, data,
	406	sizeof(struct pnp_isa_config_struc), NULL, 0);
1da177e4 LT	407	return status;
	408	}
	409
	410	int pnp_bios_isapnp_config(struct pnp_isa_config_struc *data)
	411	{
	412	int status;
07d4e9af	413
9dd78466 BH	414	status = __pnp_bios_isapnp_config(data);
	415	if (status)
	416	pnpbios_print_status("isapnp_config", status);
1da177e4 LT	417	return status;
	418	}
	419
	420	/*
	421	* Call PnP BIOS with function 0x41, "get ESCD info"
	422	*/
	423	static int __pnp_bios_escd_info(struct escd_info_struc *data)
	424	{
	425	u16 status;
07d4e9af	426
1da177e4 LT	427	if (!pnp_bios_present())
1da177e4 LT	428	return ESCD_FUNCTION_NOT_SUPPORTED;
07d4e9af BH	429	status = call_pnp_bios(PNP_GET_ESCD_INFO, 0, PNP_TS1, 2, PNP_TS1, 4,
	430	PNP_TS1, PNP_DS, data,
	431	sizeof(struct escd_info_struc), NULL, 0);
1da177e4 LT	432	return status;
	433	}
	434
	435	int pnp_bios_escd_info(struct escd_info_struc *data)
	436	{
	437	int status;
07d4e9af	438
9dd78466 BH	439	status = __pnp_bios_escd_info(data);
	440	if (status)
	441	pnpbios_print_status("escd_info", status);
1da177e4 LT	442	return status;
	443	}
	444
	445	/*
	446	* Call PnP BIOS function 0x42, "read ESCD"
	447	* nvram_base is determined by calling escd_info
	448	*/
	449	static int __pnp_bios_read_escd(char *data, u32 nvram_base)
	450	{
	451	u16 status;
07d4e9af	452
1da177e4 LT	453	if (!pnp_bios_present())
1da177e4 LT	454	return ESCD_FUNCTION_NOT_SUPPORTED;
07d4e9af BH	455	status = call_pnp_bios(PNP_READ_ESCD, 0, PNP_TS1, PNP_TS2, PNP_DS, 0, 0,
07d4e9af BH	456	0, data, 65536, __va(nvram_base), 65536);
1da177e4 LT	457	return status;
	458	}
	459
	460	int pnp_bios_read_escd(char *data, u32 nvram_base)
	461	{
	462	int status;
07d4e9af	463
9dd78466 BH	464	status = __pnp_bios_read_escd(data, nvram_base);
	465	if (status)
	466	pnpbios_print_status("read_escd", status);
1da177e4 LT	467	return status;
	468	}
	469
1da177e4 LT	470	void pnpbios_calls_init(union pnp_bios_install_struct *header)
	471	{
	472	int i;
07d4e9af	473
1da177e4 LT	474	spin_lock_init(&pnp_bios_lock);
	475	pnp_bios_callpoint.offset = header->fields.pm16offset;
	476	pnp_bios_callpoint.segment = PNP_CS16;
	477
6aaa8ce5	478	for_each_possible_cpu(i) {
9dd78466 BH	479	struct desc_struct *gdt = get_cpu_gdt_table(i);
	480	if (!gdt)
	481	continue;
57594742 AM	482	set_desc_base(&gdt[GDT_ENTRY_PNPBIOS_CS32],
	483	(unsigned long)&pnp_bios_callfunc);
	484	set_desc_base(&gdt[GDT_ENTRY_PNPBIOS_CS16],
	485	(unsigned long)__va(header->fields.pm16cseg));
	486	set_desc_base(&gdt[GDT_ENTRY_PNPBIOS_DS],
	487	(unsigned long)__va(header->fields.pm16dseg));
9dd78466	488	}
1da177e4	489	}