[linux-block.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/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_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 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;
}

/*
 * 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>
	20	#include <asm/system.h>
	21	#include <asm/byteorder.h>
	22
	23	#include "pnpbios.h"
	24
	25	static struct {
9dd78466 BH	26	u16 offset;
9dd78466 BH	27	u16 segment;
1da177e4 LT	28	} pnp_bios_callpoint;
1da177e4 LT	29
1da177e4 LT	30	/*
	31	* These are some opcodes for a "static asmlinkage"
	32	* As this code is not executed inside the linux kernel segment, but in a
	33	* alias at offset 0, we need a far return that can not be compiled by
	34	* default (please, prove me wrong! this is really ugly!)
	35	* This is the only way to get the bios to return into the kernel code,
	36	* because the bios code runs in 16 bit protected mode and therefore can only
	37	* return to the caller if the call is within the first 64kB, and the linux
	38	* kernel begins at offset 3GB...
	39	*/
	40
	41	asmlinkage void pnp_bios_callfunc(void);
	42
9dd78466	43	__asm__(".text \n"
1da177e4 LT	44	__ALIGN_STR "\n"
	45	"pnp_bios_callfunc:\n"
	46	" pushl %edx \n"
	47	" pushl %ecx \n"
	48	" pushl %ebx \n"
	49	" pushl %eax \n"
	50	" lcallw *pnp_bios_callpoint\n"
	51	" addl $16, %esp \n"
07d4e9af BH	52	" lret \n"
07d4e9af BH	53	".previous \n");
1da177e4	54
1da177e4 LT	55	#define Q2_SET_SEL(cpu, selname, address, size) \
1da177e4 LT	56	do { \
57594742 AM	57	struct desc_struct *gdt = get_cpu_gdt_table((cpu)); \
	58	set_desc_base(&gdt[(selname) >> 3], (u32)(address)); \
	59	set_desc_limit(&gdt[(selname) >> 3], (size) - 1); \
1da177e4 LT	60	} while(0)
1da177e4 LT	61
c7425314 AM	62	static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092,
c7425314 AM	63	(unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1);
1da177e4 LT	64
	65	/*
	66	* At some point we want to use this stack frame pointer to unwind
	67	* after PnP BIOS oopses.
	68	*/
	69
	70	u32 pnp_bios_fault_esp;
	71	u32 pnp_bios_fault_eip;
	72	u32 pnp_bios_is_utter_crap = 0;
	73
	74	static spinlock_t pnp_bios_lock;
	75
1da177e4 LT	76	/*
	77	* Support Functions
	78	*/
	79
	80	static inline u16 call_pnp_bios(u16 func, u16 arg1, u16 arg2, u16 arg3,
	81	u16 arg4, u16 arg5, u16 arg6, u16 arg7,
	82	void *ts1_base, u32 ts1_size,
	83	void *ts2_base, u32 ts2_size)
	84	{
	85	unsigned long flags;
	86	u16 status;
	87	struct desc_struct save_desc_40;
	88	int cpu;
	89
	90	/*
	91	* PnP BIOSes are generally not terribly re-entrant.
	92	* Also, don't rely on them to save everything correctly.
	93	*/
9dd78466	94	if (pnp_bios_is_utter_crap)
1da177e4 LT	95	return PNP_FUNCTION_NOT_SUPPORTED;
	96
	97	cpu = get_cpu();
7c4cb60e ZA	98	save_desc_40 = get_cpu_gdt_table(cpu)[0x40 / 8];
7c4cb60e ZA	99	get_cpu_gdt_table(cpu)[0x40 / 8] = bad_bios_desc;
1da177e4 LT	100
	101	/* On some boxes IRQ's during PnP BIOS calls are deadly. */
	102	spin_lock_irqsave(&pnp_bios_lock, flags);
	103
	104	/* The lock prevents us bouncing CPU here */
	105	if (ts1_size)
	106	Q2_SET_SEL(smp_processor_id(), PNP_TS1, ts1_base, ts1_size);
	107	if (ts2_size)
	108	Q2_SET_SEL(smp_processor_id(), PNP_TS2, ts2_base, ts2_size);
	109
9dd78466 BH	110	__asm__ __volatile__("pushl %%ebp\n\t"
	111	"pushl %%edi\n\t"
	112	"pushl %%esi\n\t"
	113	"pushl %%ds\n\t"
	114	"pushl %%es\n\t"
	115	"pushl %%fs\n\t"
	116	"pushl %%gs\n\t"
	117	"pushfl\n\t"
	118	"movl %%esp, pnp_bios_fault_esp\n\t"
	119	"movl $1f, pnp_bios_fault_eip\n\t"
	120	"lcall %5,%6\n\t"
	121	"1:popfl\n\t"
	122	"popl %%gs\n\t"
	123	"popl %%fs\n\t"
	124	"popl %%es\n\t"
	125	"popl %%ds\n\t"
	126	"popl %%esi\n\t"
07d4e9af BH	127	"popl %%edi\n\t"
07d4e9af BH	128	"popl %%ebp\n\t":"=a"(status)
9dd78466 BH	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;
07d4e9af	256
1da177e4 LT	257	if (!pnp_bios_present())
1da177e4 LT	258	return PNP_FUNCTION_NOT_SUPPORTED;
07d4e9af BH	259	status = call_pnp_bios(PNP_GET_NUM_SYS_DEV_NODES, 0, PNP_TS1, 2,
	260	PNP_TS1, PNP_DS, 0, 0, data,
	261	sizeof(struct pnp_dev_node_info), 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	268	int status = __pnp_bios_dev_node_info(data);
07d4e9af	269
9dd78466 BH	270	if (status)
9dd78466 BH	271	pnpbios_print_status("dev_node_info", status);
1da177e4 LT	272	return status;
	273	}
	274
	275	/*
	276	* Note that some PnP BIOSes (e.g., on Sony Vaio laptops) die a horrible
	277	* death if they are asked to access the "current" configuration.
	278	* Therefore, if it's a matter of indifference, it's better to call
	279	* get_dev_node() and set_dev_node() with boot=1 rather than with boot=0.
	280	*/
	281
	282	/*
	283	* Call PnP BIOS with function 0x01, "get system device node"
	284	* Input: *nodenum = desired node,
	285	* boot = whether to get nonvolatile boot (!=0)
	286	* or volatile current (0) config
	287	* Output: *nodenum=next node or 0xff if no more nodes
	288	*/
07d4e9af	289	static int __pnp_bios_get_dev_node(u8 *nodenum, char boot,
9dd78466	290	struct pnp_bios_node *data)
1da177e4 LT	291	{
1da177e4 LT	292	u16 status;
5fe9fe3c	293	u16 tmp_nodenum;
07d4e9af	294
1da177e4 LT	295	if (!pnp_bios_present())
1da177e4 LT	296	return PNP_FUNCTION_NOT_SUPPORTED;
9dd78466	297	if (!boot && pnpbios_dont_use_current_config)
1da177e4	298	return PNP_FUNCTION_NOT_SUPPORTED;
5fe9fe3c	299	tmp_nodenum = *nodenum;
07d4e9af BH	300	status = call_pnp_bios(PNP_GET_SYS_DEV_NODE, 0, PNP_TS1, 0, PNP_TS2,
	301	boot ? 2 : 1, PNP_DS, 0, &tmp_nodenum,
	302	sizeof(tmp_nodenum), data, 65536);
5fe9fe3c	303	*nodenum = tmp_nodenum;
1da177e4 LT	304	return status;
	305	}
	306
07d4e9af	307	int pnp_bios_get_dev_node(u8 nodenum, char boot, struct pnp_bios_node data)
1da177e4 LT	308	{
1da177e4 LT	309	int status;
07d4e9af	310
9dd78466 BH	311	status = __pnp_bios_get_dev_node(nodenum, boot, data);
	312	if (status)
	313	pnpbios_print_status("get_dev_node", status);
1da177e4 LT	314	return status;
	315	}
	316
1da177e4 LT	317	/*
	318	* Call PnP BIOS with function 0x02, "set system device node"
	319	* Input: *nodenum = desired node,
	320	* boot = whether to set nonvolatile boot (!=0)
	321	* or volatile current (0) config
	322	*/
9dd78466 BH	323	static int __pnp_bios_set_dev_node(u8 nodenum, char boot,
9dd78466 BH	324	struct pnp_bios_node *data)
1da177e4 LT	325	{
1da177e4 LT	326	u16 status;
07d4e9af	327
1da177e4 LT	328	if (!pnp_bios_present())
1da177e4 LT	329	return PNP_FUNCTION_NOT_SUPPORTED;
9dd78466	330	if (!boot && pnpbios_dont_use_current_config)
1da177e4	331	return PNP_FUNCTION_NOT_SUPPORTED;
07d4e9af BH	332	status = call_pnp_bios(PNP_SET_SYS_DEV_NODE, nodenum, 0, PNP_TS1,
	333	boot ? 2 : 1, PNP_DS, 0, 0, data, 65536, NULL,
	334	0);
1da177e4 LT	335	return status;
	336	}
	337
	338	int pnp_bios_set_dev_node(u8 nodenum, char boot, struct pnp_bios_node *data)
	339	{
	340	int status;
07d4e9af	341
9dd78466 BH	342	status = __pnp_bios_set_dev_node(nodenum, boot, data);
	343	if (status) {
	344	pnpbios_print_status("set_dev_node", status);
1da177e4 LT	345	return status;
1da177e4 LT	346	}
9dd78466 BH	347	if (!boot) { /* Update devlist */
	348	status = pnp_bios_get_dev_node(&nodenum, boot, data);
	349	if (status)
1da177e4 LT	350	return status;
	351	}
	352	return status;
	353	}
	354
1da177e4 LT	355	/*
	356	* Call PnP BIOS with function 0x05, "get docking station information"
	357	*/
	358	int pnp_bios_dock_station_info(struct pnp_docking_station_info *data)
	359	{
	360	u16 status;
1da177e4	361
1da177e4 LT	362	if (!pnp_bios_present())
1da177e4 LT	363	return PNP_FUNCTION_NOT_SUPPORTED;
07d4e9af BH	364	status = call_pnp_bios(PNP_GET_DOCKING_STATION_INFORMATION, 0, PNP_TS1,
	365	PNP_DS, 0, 0, 0, 0, data,
	366	sizeof(struct pnp_docking_station_info), NULL,
	367	0);
1da177e4 LT	368	return status;
1da177e4 LT	369	}
1da177e4 LT	370
	371	/*
	372	* Call PnP BIOS with function 0x0a, "get statically allocated resource
	373	* information"
	374	*/
	375	static int __pnp_bios_get_stat_res(char *info)
	376	{
	377	u16 status;
07d4e9af	378
1da177e4 LT	379	if (!pnp_bios_present())
1da177e4 LT	380	return PNP_FUNCTION_NOT_SUPPORTED;
07d4e9af BH	381	status = call_pnp_bios(PNP_GET_STATIC_ALLOCED_RES_INFO, 0, PNP_TS1,
07d4e9af BH	382	PNP_DS, 0, 0, 0, 0, info, 65536, NULL, 0);
1da177e4 LT	383	return status;
	384	}
	385
	386	int pnp_bios_get_stat_res(char *info)
	387	{
	388	int status;
07d4e9af	389
9dd78466 BH	390	status = __pnp_bios_get_stat_res(info);
	391	if (status)
	392	pnpbios_print_status("get_stat_res", status);
1da177e4 LT	393	return status;
	394	}
	395
1da177e4 LT	396	/*
	397	* Call PnP BIOS with function 0x40, "get isa pnp configuration structure"
	398	*/
	399	static int __pnp_bios_isapnp_config(struct pnp_isa_config_struc *data)
	400	{
	401	u16 status;
07d4e9af	402
1da177e4 LT	403	if (!pnp_bios_present())
1da177e4 LT	404	return PNP_FUNCTION_NOT_SUPPORTED;
07d4e9af BH	405	status = call_pnp_bios(PNP_GET_PNP_ISA_CONFIG_STRUC, 0, PNP_TS1, PNP_DS,
	406	0, 0, 0, 0, data,
	407	sizeof(struct pnp_isa_config_struc), NULL, 0);
1da177e4 LT	408	return status;
	409	}
	410
	411	int pnp_bios_isapnp_config(struct pnp_isa_config_struc *data)
	412	{
	413	int status;
07d4e9af	414
9dd78466 BH	415	status = __pnp_bios_isapnp_config(data);
	416	if (status)
	417	pnpbios_print_status("isapnp_config", status);
1da177e4 LT	418	return status;
	419	}
	420
	421	/*
	422	* Call PnP BIOS with function 0x41, "get ESCD info"
	423	*/
	424	static int __pnp_bios_escd_info(struct escd_info_struc *data)
	425	{
	426	u16 status;
07d4e9af	427
1da177e4 LT	428	if (!pnp_bios_present())
1da177e4 LT	429	return ESCD_FUNCTION_NOT_SUPPORTED;
07d4e9af BH	430	status = call_pnp_bios(PNP_GET_ESCD_INFO, 0, PNP_TS1, 2, PNP_TS1, 4,
	431	PNP_TS1, PNP_DS, data,
	432	sizeof(struct escd_info_struc), NULL, 0);
1da177e4 LT	433	return status;
	434	}
	435
	436	int pnp_bios_escd_info(struct escd_info_struc *data)
	437	{
	438	int status;
07d4e9af	439
9dd78466 BH	440	status = __pnp_bios_escd_info(data);
	441	if (status)
	442	pnpbios_print_status("escd_info", status);
1da177e4 LT	443	return status;
	444	}
	445
	446	/*
	447	* Call PnP BIOS function 0x42, "read ESCD"
	448	* nvram_base is determined by calling escd_info
	449	*/
	450	static int __pnp_bios_read_escd(char *data, u32 nvram_base)
	451	{
	452	u16 status;
07d4e9af	453
1da177e4 LT	454	if (!pnp_bios_present())
1da177e4 LT	455	return ESCD_FUNCTION_NOT_SUPPORTED;
07d4e9af BH	456	status = call_pnp_bios(PNP_READ_ESCD, 0, PNP_TS1, PNP_TS2, PNP_DS, 0, 0,
07d4e9af BH	457	0, data, 65536, __va(nvram_base), 65536);
1da177e4 LT	458	return status;
	459	}
	460
	461	int pnp_bios_read_escd(char *data, u32 nvram_base)
	462	{
	463	int status;
07d4e9af	464
9dd78466 BH	465	status = __pnp_bios_read_escd(data, nvram_base);
	466	if (status)
	467	pnpbios_print_status("read_escd", status);
1da177e4 LT	468	return status;
	469	}
	470
1da177e4 LT	471	void pnpbios_calls_init(union pnp_bios_install_struct *header)
	472	{
	473	int i;
07d4e9af	474
1da177e4 LT	475	spin_lock_init(&pnp_bios_lock);
	476	pnp_bios_callpoint.offset = header->fields.pm16offset;
	477	pnp_bios_callpoint.segment = PNP_CS16;
	478
6aaa8ce5	479	for_each_possible_cpu(i) {
9dd78466 BH	480	struct desc_struct *gdt = get_cpu_gdt_table(i);
	481	if (!gdt)
	482	continue;
57594742 AM	483	set_desc_base(&gdt[GDT_ENTRY_PNPBIOS_CS32],
	484	(unsigned long)&pnp_bios_callfunc);
	485	set_desc_base(&gdt[GDT_ENTRY_PNPBIOS_CS16],
	486	(unsigned long)__va(header->fields.pm16cseg));
	487	set_desc_base(&gdt[GDT_ENTRY_PNPBIOS_DS],
	488	(unsigned long)__va(header->fields.pm16dseg));
9dd78466	489	}
1da177e4	490	}