freebsd-skq/sys/compat/ndis/ntoskrnl_var.h

/*-
 * Copyright (c) 2003
 *	Bill Paul <wpaul@windriver.com>.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Bill Paul.
 * 4. Neither the name of the author nor the names of any co-contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR THE VOICES IN HIS HEAD
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 *
 * $FreeBSD$
 */

#ifndef _NTOSKRNL_VAR_H_
#define	_NTOSKRNL_VAR_H_

#define	MTX_NTOSKRNL_SPIN_LOCK "NDIS thread lock"

/*
 * us_buf is really a wchar_t *, but it's inconvenient to include
 * all the necessary header goop needed to define it, and it's a
 * pointer anyway, so for now, just make it a uint16_t *.
 */
struct unicode_string {
	uint16_t		us_len;
	uint16_t		us_maxlen;
	uint16_t		*us_buf;
};

typedef struct unicode_string unicode_string;

struct ansi_string {
	uint16_t		as_len;
	uint16_t		as_maxlen;
	char			*as_buf;
};

typedef struct ansi_string ansi_string;

/*
 * Windows memory descriptor list. In Windows, it's possible for
 * buffers to be passed between user and kernel contexts without
 * copying. Buffers may also be allocated in either paged or
 * non-paged memory regions. An MDL describes the pages of memory
 * used to contain a particular buffer. Note that a single MDL
 * may describe a buffer that spans multiple pages. An array of
 * page addresses appears immediately after the MDL structure itself.
 * MDLs are therefore implicitly variably sized, even though they
 * don't look it.
 *
 * Note that in FreeBSD, we can take many shortcuts in the way
 * we handle MDLs because:
 *
 * - We are only concerned with pages in kernel context. This means
 *   we will only ever use the kernel's memory map, and remapping
 *   of buffers is never needed.
 *
 * - Kernel pages can never be paged out, so we don't have to worry
 *   about whether or not a page is actually mapped before going to
 *   touch it.
 */

struct mdl {
	struct mdl		*mdl_next;
	uint16_t		mdl_size;
	uint16_t		mdl_flags;
	void			*mdl_process;
	void			*mdl_mappedsystemva;
	void			*mdl_startva;
	uint32_t		mdl_bytecount;
	uint32_t		mdl_byteoffset;
};

typedef struct mdl mdl, ndis_buffer;

/* MDL flags */

#define	MDL_MAPPED_TO_SYSTEM_VA		0x0001
#define	MDL_PAGES_LOCKED		0x0002
#define	MDL_SOURCE_IS_NONPAGED_POOL	0x0004
#define	MDL_ALLOCATED_FIXED_SIZE	0x0008
#define	MDL_PARTIAL			0x0010
#define	MDL_PARTIAL_HAS_BEEN_MAPPED	0x0020
#define	MDL_IO_PAGE_READ		0x0040
#define	MDL_WRITE_OPERATION		0x0080
#define	MDL_PARENT_MAPPED_SYSTEM_VA	0x0100
#define	MDL_FREE_EXTRA_PTES		0x0200
#define	MDL_IO_SPACE			0x0800
#define	MDL_NETWORK_HEADER		0x1000
#define	MDL_MAPPING_CAN_FAIL		0x2000
#define	MDL_ALLOCATED_MUST_SUCCEED	0x4000
#define	MDL_ZONE_ALLOCED		0x8000	/* BSD private */

#define	MDL_ZONE_PAGES 16
#define	MDL_ZONE_SIZE (sizeof(mdl) + (sizeof(vm_offset_t) * MDL_ZONE_PAGES))

/* Note: assumes x86 page size of 4K. */

#ifndef PAGE_SHIFT
#if PAGE_SIZE == 4096
#define	PAGE_SHIFT	12
#elif PAGE_SIZE == 8192
#define	PAGE_SHIFT	13
#else
#error PAGE_SHIFT undefined!
#endif
#endif

#define	SPAN_PAGES(ptr, len)					\
	((uint32_t)((((uintptr_t)(ptr) & (PAGE_SIZE - 1)) +	\
	(len) + (PAGE_SIZE - 1)) >> PAGE_SHIFT))

#define	PAGE_ALIGN(ptr)						\
	((void *)((uintptr_t)(ptr) & ~(PAGE_SIZE - 1)))

#define	BYTE_OFFSET(ptr)					\
	((uint32_t)((uintptr_t)(ptr) & (PAGE_SIZE - 1)))

#define	MDL_PAGES(m)	(vm_offset_t *)(m + 1)

#define	MmInitializeMdl(b, baseva, len)					\
	(b)->mdl_next = NULL;						\
	(b)->mdl_size = (uint16_t)(sizeof(mdl) +			\
		(sizeof(vm_offset_t) * SPAN_PAGES((baseva), (len))));	\
	(b)->mdl_flags = 0;						\
	(b)->mdl_startva = (void *)PAGE_ALIGN((baseva));		\
	(b)->mdl_byteoffset = BYTE_OFFSET((baseva));			\
	(b)->mdl_bytecount = (uint32_t)(len);

#define	MmGetMdlByteOffset(mdl)		((mdl)->mdl_byteoffset)
#define	MmGetMdlByteCount(mdl)		((mdl)->mdl_bytecount)
#define	MmGetMdlVirtualAddress(mdl)					\
	((void *)((char *)((mdl)->mdl_startva) + (mdl)->mdl_byteoffset))
#define	MmGetMdlStartVa(mdl)		((mdl)->mdl_startva)
#define	MmGetMdlPfnArray(mdl)		MDL_PAGES(mdl)

#define	WDM_MAJOR		1
#define	WDM_MINOR_WIN98		0x00
#define	WDM_MINOR_WINME		0x05
#define	WDM_MINOR_WIN2000	0x10
#define	WDM_MINOR_WINXP		0x20
#define	WDM_MINOR_WIN2003	0x30

enum nt_caching_type {
	MmNonCached			= 0,
	MmCached			= 1,
	MmWriteCombined			= 2,
	MmHardwareCoherentCached	= 3,
	MmNonCachedUnordered		= 4,
	MmUSWCCached			= 5,
	MmMaximumCacheType		= 6
};

/*-
 * The ndis_kspin_lock type is called KSPIN_LOCK in MS-Windows.
 * According to the Windows DDK header files, KSPIN_LOCK is defined like this:
 *	typedef ULONG_PTR KSPIN_LOCK;
 *
 * From basetsd.h (SDK, Feb. 2003):
 *	typedef [public] unsigned __int3264 ULONG_PTR, *PULONG_PTR;
 *	typedef unsigned __int64 ULONG_PTR, *PULONG_PTR;
 *	typedef _W64 unsigned long ULONG_PTR, *PULONG_PTR;
 *
 * The keyword __int3264 specifies an integral type that has the following
 * properties:
 *	+ It is 32-bit on 32-bit platforms
 *	+ It is 64-bit on 64-bit platforms
 *	+ It is 32-bit on the wire for backward compatibility.
 *	  It gets truncated on the sending side and extended appropriately
 *	  (signed or unsigned) on the receiving side.
 *
 * Thus register_t seems the proper mapping onto FreeBSD for spin locks.
 */

typedef register_t kspin_lock;

struct slist_entry {
	struct slist_entry	*sl_next;
};

typedef struct slist_entry slist_entry;

union slist_header {
	uint64_t		slh_align;
	struct {
		struct slist_entry	*slh_next;
		uint16_t		slh_depth;
		uint16_t		slh_seq;
	} slh_list;
};

typedef union slist_header slist_header;

struct list_entry {
	struct list_entry *nle_flink;
	struct list_entry *nle_blink;
};

typedef struct list_entry list_entry;

#define	InitializeListHead(l)			\
	(l)->nle_flink = (l)->nle_blink = (l)

#define	IsListEmpty(h)				\
	((h)->nle_flink == (h))

#define	RemoveEntryList(e)			\
	do {					\
		list_entry		*b;	\
		list_entry		*f;	\
						\
		f = (e)->nle_flink;		\
		b = (e)->nle_blink;		\
		b->nle_flink = f;		\
		f->nle_blink = b;		\
	} while (0)

/* These two have to be inlined since they return things. */

static __inline__ list_entry *
RemoveHeadList(list_entry *l)
{
	list_entry		*f;
	list_entry		*e;

	e = l->nle_flink;
	f = e->nle_flink;
	l->nle_flink = f;
	f->nle_blink = l;

	return (e);
}

static __inline__ list_entry *
RemoveTailList(list_entry *l)
{
	list_entry		*b;
	list_entry		*e;

	e = l->nle_blink;
	b = e->nle_blink;
	l->nle_blink = b;
	b->nle_flink = l;

	return (e);
}

#define	InsertTailList(l, e)			\
	do {					\
		list_entry		*b;	\
						\
		b = l->nle_blink;		\
		e->nle_flink = l;		\
		e->nle_blink = b;		\
		b->nle_flink = (e);		\
		l->nle_blink = (e);		\
	} while (0)

#define	InsertHeadList(l, e)			\
	do {					\
		list_entry		*f;	\
						\
		f = l->nle_flink;		\
		e->nle_flink = f;		\
		e->nle_blink = l;		\
		f->nle_blink = e;		\
		l->nle_flink = e;		\
	} while (0)

#define	CONTAINING_RECORD(addr, type, field)	\
	((type *)((vm_offset_t)(addr) - (vm_offset_t)(&((type *)0)->field)))

struct nt_dispatch_header {
	uint8_t			dh_type;
	uint8_t			dh_abs;
	uint8_t			dh_size;
	uint8_t			dh_inserted;
	int32_t			dh_sigstate;
	list_entry		dh_waitlisthead;
};

typedef struct nt_dispatch_header nt_dispatch_header;

/* Dispatcher object types */

#define	DISP_TYPE_NOTIFICATION_EVENT	0	/* KEVENT */
#define	DISP_TYPE_SYNCHRONIZATION_EVENT	1	/* KEVENT */
#define	DISP_TYPE_MUTANT		2	/* KMUTANT/KMUTEX */
#define	DISP_TYPE_PROCESS		3	/* KPROCESS */
#define	DISP_TYPE_QUEUE			4	/* KQUEUE */
#define	DISP_TYPE_SEMAPHORE		5	/* KSEMAPHORE */
#define	DISP_TYPE_THREAD		6	/* KTHREAD */
#define	DISP_TYPE_NOTIFICATION_TIMER	8	/* KTIMER */
#define	DISP_TYPE_SYNCHRONIZATION_TIMER	9	/* KTIMER */

#define	OTYPE_EVENT		0
#define	OTYPE_MUTEX		1
#define	OTYPE_THREAD		2
#define	OTYPE_TIMER		3

/* Windows dispatcher levels. */

#define	PASSIVE_LEVEL		0
#define	LOW_LEVEL		0
#define	APC_LEVEL		1
#define	DISPATCH_LEVEL		2
#define	DEVICE_LEVEL		(DISPATCH_LEVEL + 1)
#define	PROFILE_LEVEL		27
#define	CLOCK1_LEVEL		28
#define	CLOCK2_LEVEL		28
#define	IPI_LEVEL		29
#define	POWER_LEVEL		30
#define	HIGH_LEVEL		31

#define	SYNC_LEVEL_UP		DISPATCH_LEVEL
#define	SYNC_LEVEL_MP		(IPI_LEVEL - 1)

#define	AT_PASSIVE_LEVEL(td)		\
	((td)->td_proc->p_flag & P_KTHREAD == FALSE)

#define	AT_DISPATCH_LEVEL(td)		\
	((td)->td_base_pri == PI_REALTIME)

#define	AT_DIRQL_LEVEL(td)		\
	((td)->td_priority <= PI_NET)

#define	AT_HIGH_LEVEL(td)		\
	((td)->td_critnest != 0)

struct nt_objref {
	nt_dispatch_header	no_dh;
	void			*no_obj;
	TAILQ_ENTRY(nt_objref)	link;
};

TAILQ_HEAD(nt_objref_head, nt_objref);

typedef struct nt_objref nt_objref;

#define	EVENT_TYPE_NOTIFY	0
#define	EVENT_TYPE_SYNC		1

/*
 * We need to use the timeout()/untimeout() API for ktimers
 * since timers can be initialized, but not destroyed (so
 * malloc()ing our own callout structures would mean a leak,
 * since there'd be no way to free() them). This means we
 * need to use struct callout_handle, which is really just a
 * pointer. To make it easier to deal with, we use a union
 * to overlay the callout_handle over the k_timerlistentry.
 * The latter is a list_entry, which is two pointers, so
 * there's enough space available to hide a callout_handle
 * there.
 */

struct ktimer {
	nt_dispatch_header	k_header;
	uint64_t		k_duetime;
	union {
		list_entry		k_timerlistentry;
		struct callout		*k_callout;
	} u;
	void			*k_dpc;
	uint32_t		k_period;
};

#define	k_timerlistentry	u.k_timerlistentry
#define	k_callout		u.k_callout

typedef struct ktimer ktimer;

struct nt_kevent {
	nt_dispatch_header	k_header;
};

typedef struct nt_kevent nt_kevent;

/* Kernel defered procedure call (i.e. timer callback) */

struct kdpc;
typedef void (*kdpc_func)(struct kdpc *, void *, void *, void *);

struct kdpc {
	uint16_t		k_type;
	uint8_t			k_num;		/* CPU number */
	uint8_t			k_importance;	/* priority */
	list_entry		k_dpclistentry;
	void			*k_deferedfunc;
	void			*k_deferredctx;
	void			*k_sysarg1;
	void			*k_sysarg2;
	void			*k_lock;
};

#define	KDPC_IMPORTANCE_LOW	0
#define	KDPC_IMPORTANCE_MEDIUM	1
#define	KDPC_IMPORTANCE_HIGH	2

#define	KDPC_CPU_DEFAULT	255

typedef struct kdpc kdpc;

/*
 * Note: the acquisition count is BSD-specific. The Microsoft
 * documentation says that mutexes can be acquired recursively
 * by a given thread, but that you must release the mutex as
 * many times as you acquired it before it will be set to the
 * signalled state (i.e. before any other threads waiting on
 * the object will be woken up). However the Windows KMUTANT
 * structure has no field for keeping track of the number of
 * acquisitions, so we need to add one ourselves. As long as
 * driver code treats the mutex as opaque, we should be ok.
 */
struct kmutant {
	nt_dispatch_header	km_header;
	list_entry		km_listentry;
	void			*km_ownerthread;
	uint8_t			km_abandoned;
	uint8_t			km_apcdisable;
};

typedef struct kmutant kmutant;

#define	LOOKASIDE_DEPTH 256

struct general_lookaside {
	slist_header		gl_listhead;
	uint16_t		gl_depth;
	uint16_t		gl_maxdepth;
	uint32_t		gl_totallocs;
	union {
		uint32_t		gl_allocmisses;
		uint32_t		gl_allochits;
	} u_a;
	uint32_t		gl_totalfrees;
	union {
		uint32_t		gl_freemisses;
		uint32_t		gl_freehits;
	} u_m;
	uint32_t		gl_type;
	uint32_t		gl_tag;
	uint32_t		gl_size;
	void			*gl_allocfunc;
	void			*gl_freefunc;
	list_entry		gl_listent;
	uint32_t		gl_lasttotallocs;
	union {
		uint32_t		gl_lastallocmisses;
		uint32_t		gl_lastallochits;
	} u_l;
	uint32_t		gl_rsvd[2];
};

typedef struct general_lookaside general_lookaside;

struct npaged_lookaside_list {
	general_lookaside	nll_l;
#ifdef __i386__
	kspin_lock		nll_obsoletelock;
#endif
};

typedef struct npaged_lookaside_list npaged_lookaside_list;
typedef struct npaged_lookaside_list paged_lookaside_list;

typedef void * (*lookaside_alloc_func)(uint32_t, size_t, uint32_t);
typedef void (*lookaside_free_func)(void *);

struct irp;

struct kdevice_qentry {
	list_entry		kqe_devlistent;
	uint32_t		kqe_sortkey;
	uint8_t			kqe_inserted;
};

typedef struct kdevice_qentry kdevice_qentry;

struct kdevice_queue {
	uint16_t		kq_type;
	uint16_t		kq_size;
	list_entry		kq_devlisthead;
	kspin_lock		kq_lock;
	uint8_t			kq_busy;
};

typedef struct kdevice_queue kdevice_queue;

struct wait_ctx_block {
	kdevice_qentry		wcb_waitqueue;
	void			*wcb_devfunc;
	void			*wcb_devctx;
	uint32_t		wcb_mapregcnt;
	void			*wcb_devobj;
	void			*wcb_curirp;
	void			*wcb_bufchaindpc;
};

typedef struct wait_ctx_block wait_ctx_block;

struct wait_block {
	list_entry		wb_waitlist;
	void			*wb_kthread;
	nt_dispatch_header	*wb_object;
	struct wait_block	*wb_next;
#ifdef notdef
	uint16_t		wb_waitkey;
	uint16_t		wb_waittype;
#endif
	uint8_t			wb_waitkey;
	uint8_t			wb_waittype;
	uint8_t			wb_awakened;
	uint8_t			wb_oldpri;
};

typedef struct wait_block wait_block;

#define	wb_ext wb_kthread

#define	THREAD_WAIT_OBJECTS	3
#define	MAX_WAIT_OBJECTS	64

#define	WAITTYPE_ALL		0
#define	WAITTYPE_ANY		1

#define	WAITKEY_VALID		0x8000

/* kthread priority  */
#define	LOW_PRIORITY		0
#define	LOW_REALTIME_PRIORITY	16
#define	HIGH_PRIORITY		31

struct thread_context {
	void			*tc_thrctx;
	void			*tc_thrfunc;
};

typedef struct thread_context thread_context;

/* Forward declaration */
struct driver_object;
struct devobj_extension;

struct driver_extension {
	struct driver_object	*dre_driverobj;
	void			*dre_adddevicefunc;
	uint32_t		dre_reinitcnt;
	unicode_string		dre_srvname;

	/*
	 * Drivers are allowed to add one or more custom extensions
	 * to the driver object, but there's no special pointer
	 * for them. Hang them off here for now.
	 */

	list_entry		dre_usrext;
};

typedef struct driver_extension driver_extension;

struct custom_extension {
	list_entry		ce_list;
	void			*ce_clid;
};

typedef struct custom_extension custom_extension;

/*
 * The KINTERRUPT structure in Windows is opaque to drivers.
 * We define our own custom version with things we need.
 */

struct kinterrupt {
	list_entry		ki_list;
	device_t		ki_dev;
	int			ki_rid;
	void			*ki_cookie;
	struct resource		*ki_irq;
	kspin_lock		ki_lock_priv;
	kspin_lock		*ki_lock;
	void			*ki_svcfunc;
	void			*ki_svcctx;
};

typedef struct kinterrupt kinterrupt;

/*
 * In Windows, there are Physical Device Objects (PDOs) and
 * Functional Device Objects (FDOs). Physical Device Objects are
 * created and maintained by bus drivers. For example, the PCI
 * bus driver might detect two PCI ethernet cards on a given
 * bus. The PCI bus driver will then allocate two device_objects
 * for its own internal bookeeping purposes. This is analagous
 * to the device_t that the FreeBSD PCI code allocates and passes
 * into each PCI driver's probe and attach routines.
 *
 * When an ethernet driver claims one of the ethernet cards
 * on the bus, it will create its own device_object. This is
 * the Functional Device Object. This object is analagous to the
 * device-specific softc structure.
 */

struct device_object {
	uint16_t		do_type;
	uint16_t		do_size;
	uint32_t		do_refcnt;
	struct driver_object	*do_drvobj;
	struct device_object	*do_nextdev;
	struct device_object	*do_attacheddev;
	struct irp		*do_currirp;
	void			*do_iotimer;
	uint32_t		do_flags;
	uint32_t		do_characteristics;
	void			*do_vpb;
	void			*do_devext;
	uint32_t		do_devtype;
	uint8_t			do_stacksize;
	union {
		list_entry		do_listent;
		wait_ctx_block		do_wcb;
	} queue;
	uint32_t		do_alignreq;
	kdevice_queue		do_devqueue;
	struct kdpc		do_dpc;
	uint32_t		do_activethreads;
	void			*do_securitydesc;
	struct nt_kevent	do_devlock;
	uint16_t		do_sectorsz;
	uint16_t		do_spare1;
	struct devobj_extension	*do_devobj_ext;
	void			*do_rsvd;
};

typedef struct device_object device_object;

struct devobj_extension {
	uint16_t		dve_type;
	uint16_t		dve_size;
	device_object		*dve_devobj;
};

typedef struct devobj_extension devobj_extension;

/* Device object flags */

#define	DO_VERIFY_VOLUME		0x00000002
#define	DO_BUFFERED_IO			0x00000004
#define	DO_EXCLUSIVE			0x00000008
#define	DO_DIRECT_IO			0x00000010
#define	DO_MAP_IO_BUFFER		0x00000020
#define	DO_DEVICE_HAS_NAME		0x00000040
#define	DO_DEVICE_INITIALIZING		0x00000080
#define	DO_SYSTEM_BOOT_PARTITION	0x00000100
#define	DO_LONG_TERM_REQUESTS		0x00000200
#define	DO_NEVER_LAST_DEVICE		0x00000400
#define	DO_SHUTDOWN_REGISTERED		0x00000800
#define	DO_BUS_ENUMERATED_DEVICE	0x00001000
#define	DO_POWER_PAGABLE		0x00002000
#define	DO_POWER_INRUSH			0x00004000
#define	DO_LOW_PRIORITY_FILESYSTEM	0x00010000

/* Priority boosts */

#define	IO_NO_INCREMENT			0
#define	IO_CD_ROM_INCREMENT		1
#define	IO_DISK_INCREMENT		1
#define	IO_KEYBOARD_INCREMENT		6
#define	IO_MAILSLOT_INCREMENT		2
#define	IO_MOUSE_INCREMENT		6
#define	IO_NAMED_PIPE_INCREMENT		2
#define	IO_NETWORK_INCREMENT		2
#define	IO_PARALLEL_INCREMENT		1
#define	IO_SERIAL_INCREMENT		2
#define	IO_SOUND_INCREMENT		8
#define	IO_VIDEO_INCREMENT		1

/* IRP major codes */

#define	IRP_MJ_CREATE                   0x00
#define	IRP_MJ_CREATE_NAMED_PIPE        0x01
#define	IRP_MJ_CLOSE                    0x02
#define	IRP_MJ_READ                     0x03
#define	IRP_MJ_WRITE                    0x04
#define	IRP_MJ_QUERY_INFORMATION        0x05
#define	IRP_MJ_SET_INFORMATION          0x06
#define	IRP_MJ_QUERY_EA                 0x07
#define	IRP_MJ_SET_EA                   0x08
#define	IRP_MJ_FLUSH_BUFFERS            0x09
#define	IRP_MJ_QUERY_VOLUME_INFORMATION 0x0a
#define	IRP_MJ_SET_VOLUME_INFORMATION   0x0b
#define	IRP_MJ_DIRECTORY_CONTROL        0x0c
#define	IRP_MJ_FILE_SYSTEM_CONTROL      0x0d
#define	IRP_MJ_DEVICE_CONTROL           0x0e
#define	IRP_MJ_INTERNAL_DEVICE_CONTROL  0x0f
#define	IRP_MJ_SHUTDOWN                 0x10
#define	IRP_MJ_LOCK_CONTROL             0x11
#define	IRP_MJ_CLEANUP                  0x12
#define	IRP_MJ_CREATE_MAILSLOT          0x13
#define	IRP_MJ_QUERY_SECURITY           0x14
#define	IRP_MJ_SET_SECURITY             0x15
#define	IRP_MJ_POWER                    0x16
#define	IRP_MJ_SYSTEM_CONTROL           0x17
#define	IRP_MJ_DEVICE_CHANGE            0x18
#define	IRP_MJ_QUERY_QUOTA              0x19
#define	IRP_MJ_SET_QUOTA                0x1a
#define	IRP_MJ_PNP                      0x1b
#define	IRP_MJ_PNP_POWER                IRP_MJ_PNP      // Obsolete....
#define	IRP_MJ_MAXIMUM_FUNCTION         0x1b
#define	IRP_MJ_SCSI                     IRP_MJ_INTERNAL_DEVICE_CONTROL

/* IRP minor codes */

#define	IRP_MN_QUERY_DIRECTORY          0x01
#define	IRP_MN_NOTIFY_CHANGE_DIRECTORY  0x02
#define	IRP_MN_USER_FS_REQUEST          0x00

#define	IRP_MN_MOUNT_VOLUME             0x01
#define	IRP_MN_VERIFY_VOLUME            0x02
#define	IRP_MN_LOAD_FILE_SYSTEM         0x03
#define	IRP_MN_TRACK_LINK               0x04
#define	IRP_MN_KERNEL_CALL              0x04

#define	IRP_MN_LOCK                     0x01
#define	IRP_MN_UNLOCK_SINGLE            0x02
#define	IRP_MN_UNLOCK_ALL               0x03
#define	IRP_MN_UNLOCK_ALL_BY_KEY        0x04

#define	IRP_MN_NORMAL                   0x00
#define	IRP_MN_DPC                      0x01
#define	IRP_MN_MDL                      0x02
#define	IRP_MN_COMPLETE                 0x04
#define	IRP_MN_COMPRESSED               0x08

#define	IRP_MN_MDL_DPC                  (IRP_MN_MDL | IRP_MN_DPC)
#define	IRP_MN_COMPLETE_MDL             (IRP_MN_COMPLETE | IRP_MN_MDL)
#define	IRP_MN_COMPLETE_MDL_DPC         (IRP_MN_COMPLETE_MDL | IRP_MN_DPC)

#define	IRP_MN_SCSI_CLASS               0x01

#define	IRP_MN_START_DEVICE                 0x00
#define	IRP_MN_QUERY_REMOVE_DEVICE          0x01
#define	IRP_MN_REMOVE_DEVICE                0x02
#define	IRP_MN_CANCEL_REMOVE_DEVICE         0x03
#define	IRP_MN_STOP_DEVICE                  0x04
#define	IRP_MN_QUERY_STOP_DEVICE            0x05
#define	IRP_MN_CANCEL_STOP_DEVICE           0x06

#define	IRP_MN_QUERY_DEVICE_RELATIONS       0x07
#define	IRP_MN_QUERY_INTERFACE              0x08
#define	IRP_MN_QUERY_CAPABILITIES           0x09
#define	IRP_MN_QUERY_RESOURCES              0x0A
#define	IRP_MN_QUERY_RESOURCE_REQUIREMENTS  0x0B
#define	IRP_MN_QUERY_DEVICE_TEXT            0x0C
#define	IRP_MN_FILTER_RESOURCE_REQUIREMENTS 0x0D

#define	IRP_MN_READ_CONFIG                  0x0F
#define	IRP_MN_WRITE_CONFIG                 0x10
#define	IRP_MN_EJECT                        0x11
#define	IRP_MN_SET_LOCK                     0x12
#define	IRP_MN_QUERY_ID                     0x13
#define	IRP_MN_QUERY_PNP_DEVICE_STATE       0x14
#define	IRP_MN_QUERY_BUS_INFORMATION        0x15
#define	IRP_MN_DEVICE_USAGE_NOTIFICATION    0x16
#define	IRP_MN_SURPRISE_REMOVAL             0x17
#define	IRP_MN_QUERY_LEGACY_BUS_INFORMATION 0x18

#define	IRP_MN_WAIT_WAKE                    0x00
#define	IRP_MN_POWER_SEQUENCE               0x01
#define	IRP_MN_SET_POWER                    0x02
#define	IRP_MN_QUERY_POWER                  0x03

#define	IRP_MN_QUERY_ALL_DATA               0x00
#define	IRP_MN_QUERY_SINGLE_INSTANCE        0x01
#define	IRP_MN_CHANGE_SINGLE_INSTANCE       0x02
#define	IRP_MN_CHANGE_SINGLE_ITEM           0x03
#define	IRP_MN_ENABLE_EVENTS                0x04
#define	IRP_MN_DISABLE_EVENTS               0x05
#define	IRP_MN_ENABLE_COLLECTION            0x06
#define	IRP_MN_DISABLE_COLLECTION           0x07
#define	IRP_MN_REGINFO                      0x08
#define	IRP_MN_EXECUTE_METHOD               0x09
#define	IRP_MN_REGINFO_EX                   0x0b

/* IRP flags */

#define	IRP_NOCACHE                     0x00000001
#define	IRP_PAGING_IO                   0x00000002
#define	IRP_MOUNT_COMPLETION            0x00000002
#define	IRP_SYNCHRONOUS_API             0x00000004
#define	IRP_ASSOCIATED_IRP              0x00000008
#define	IRP_BUFFERED_IO                 0x00000010
#define	IRP_DEALLOCATE_BUFFER           0x00000020
#define	IRP_INPUT_OPERATION             0x00000040
#define	IRP_SYNCHRONOUS_PAGING_IO       0x00000040
#define	IRP_CREATE_OPERATION            0x00000080
#define	IRP_READ_OPERATION              0x00000100
#define	IRP_WRITE_OPERATION             0x00000200
#define	IRP_CLOSE_OPERATION             0x00000400
#define	IRP_DEFER_IO_COMPLETION         0x00000800
#define	IRP_OB_QUERY_NAME               0x00001000
#define	IRP_HOLD_DEVICE_QUEUE           0x00002000
#define	IRP_RETRY_IO_COMPLETION         0x00004000
#define	IRP_CLASS_CACHE_OPERATION       0x00008000
#define	IRP_SET_USER_EVENT              IRP_CLOSE_OPERATION

/* IRP I/O control flags */

#define	IRP_QUOTA_CHARGED               0x01
#define	IRP_ALLOCATED_MUST_SUCCEED      0x02
#define	IRP_ALLOCATED_FIXED_SIZE        0x04
#define	IRP_LOOKASIDE_ALLOCATION        0x08

/* I/O method types */

#define	METHOD_BUFFERED			0
#define	METHOD_IN_DIRECT		1
#define	METHOD_OUT_DIRECT		2
#define	METHOD_NEITHER			3

/* File access types */

#define	FILE_ANY_ACCESS			0x0000
#define	FILE_SPECIAL_ACCESS		FILE_ANY_ACCESS
#define	FILE_READ_ACCESS		0x0001
#define	FILE_WRITE_ACCESS		0x0002

/* Recover I/O access method from IOCTL code. */

#define	IO_METHOD(x)			((x) & 0xFFFFFFFC)

/* Recover function code from IOCTL code */

#define	IO_FUNC(x)			(((x) & 0x7FFC) >> 2)

/* Macro to construct an IOCTL code. */

#define	IOCTL_CODE(dev, func, iomethod, acc)	\
	((dev) << 16) | (acc << 14) | (func << 2) | (iomethod))


struct io_status_block {
	union {
		uint32_t		isb_status;
		void			*isb_ptr;
	} u;
	register_t		isb_info;
};
#define	isb_status		u.isb_status
#define	isb_ptr			u.isb_ptr

typedef struct io_status_block io_status_block;

struct kapc {
	uint16_t		apc_type;
	uint16_t		apc_size;
	uint32_t		apc_spare0;
	void			*apc_thread;
	list_entry		apc_list;
	void			*apc_kernfunc;
	void			*apc_rundownfunc;
	void			*apc_normalfunc;
	void			*apc_normctx;
	void			*apc_sysarg1;
	void			*apc_sysarg2;
	uint8_t			apc_stateidx;
	uint8_t			apc_cpumode;
	uint8_t			apc_inserted;
};

typedef struct kapc kapc;

typedef uint32_t (*completion_func)(device_object *,
	struct irp *, void *);
typedef uint32_t (*cancel_func)(device_object *,
	struct irp *);

struct io_stack_location {
	uint8_t			isl_major;
	uint8_t			isl_minor;
	uint8_t			isl_flags;
	uint8_t			isl_ctl;

	/*
	 * There's a big-ass union here in the actual Windows
	 * definition of the stucture, but it contains stuff
	 * that doesn't really apply to BSD, and defining it
	 * all properly would require duplicating over a dozen
	 * other structures that we'll never use. Since the
	 * io_stack_location structure is opaque to drivers
	 * anyway, I'm not going to bother with the extra crap.
	 */

	union {
		struct {
			uint32_t		isl_len;
			uint32_t		*isl_key;
			uint64_t		isl_byteoff;
		} isl_read;
		struct {
			uint32_t		isl_len;
			uint32_t		*isl_key;
			uint64_t		isl_byteoff;
		} isl_write;
		struct {
			uint32_t		isl_obuflen;
			uint32_t		isl_ibuflen;
			uint32_t		isl_iocode;
			void			*isl_type3ibuf;
		} isl_ioctl;
		struct {
			void			*isl_arg1;
			void			*isl_arg2;
			void			*isl_arg3;
			void			*isl_arg4;
		} isl_others;
	} isl_parameters __attribute__((packed));

	void			*isl_devobj;
	void			*isl_fileobj;
	completion_func		isl_completionfunc;
	void			*isl_completionctx;
};

typedef struct io_stack_location io_stack_location;

/* Stack location control flags */

#define	SL_PENDING_RETURNED		0x01
#define	SL_INVOKE_ON_CANCEL		0x20
#define	SL_INVOKE_ON_SUCCESS		0x40
#define	SL_INVOKE_ON_ERROR		0x80

struct irp {
	uint16_t		irp_type;
	uint16_t		irp_size;
	mdl			*irp_mdl;
	uint32_t		irp_flags;
	union {
		struct irp		*irp_master;
		uint32_t		irp_irpcnt;
		void			*irp_sysbuf;
	} irp_assoc;
	list_entry		irp_thlist;
	io_status_block		irp_iostat;
	uint8_t			irp_reqmode;
	uint8_t			irp_pendingreturned;
	uint8_t			irp_stackcnt;
	uint8_t			irp_currentstackloc;
	uint8_t			irp_cancel;
	uint8_t			irp_cancelirql;
	uint8_t			irp_apcenv;
	uint8_t			irp_allocflags;
	io_status_block		*irp_usriostat;
	nt_kevent		*irp_usrevent;
	union {
		struct {
			void			*irp_apcfunc;
			void			*irp_apcctx;
		} irp_asyncparms;
		uint64_t			irp_allocsz;
	} irp_overlay;
	cancel_func		irp_cancelfunc;
	void			*irp_userbuf;

	/* Windows kernel info */

	union {
		struct {
			union {
				kdevice_qentry			irp_dqe;
				struct {
					void			*irp_drvctx[4];
				} s1;
			} u1;
			void			*irp_thread;
			char			*irp_auxbuf;
			struct {
				list_entry			irp_list;
				union {
					io_stack_location	*irp_csl;
					uint32_t		irp_pkttype;
				} u2;
			} s2;
			void			*irp_fileobj;
		} irp_overlay;
		union {
			kapc			irp_apc;
			struct {
				void		*irp_ep;
				void		*irp_dev;
			} irp_usb;
		} irp_misc;
		void			*irp_compkey;
	} irp_tail;
};

#define	irp_csl			s2.u2.irp_csl
#define	irp_pkttype		s2.u2.irp_pkttype

#define	IRP_NDIS_DEV(irp)	(irp)->irp_tail.irp_misc.irp_usb.irp_dev
#define	IRP_NDISUSB_EP(irp)	(irp)->irp_tail.irp_misc.irp_usb.irp_ep

typedef struct irp irp;

#define	InterlockedExchangePointer(dst, val)				\
	(void *)InterlockedExchange((uint32_t *)(dst), (uintptr_t)(val))

#define	IoSizeOfIrp(ssize)						\
	((uint16_t) (sizeof(irp) + ((ssize) * (sizeof(io_stack_location)))))

#define	IoSetCancelRoutine(irp, func)					\
	(cancel_func)InterlockedExchangePointer(			\
	(void *)&(ip)->irp_cancelfunc, (void *)(func))

#define	IoSetCancelValue(irp, val)					\
	(u_long)InterlockedExchangePointer(				\
	(void *)&(ip)->irp_cancel, (void *)(val))

#define	IoGetCurrentIrpStackLocation(irp)				\
	(irp)->irp_tail.irp_overlay.irp_csl

#define	IoGetNextIrpStackLocation(irp)					\
	((irp)->irp_tail.irp_overlay.irp_csl - 1)

#define	IoSetNextIrpStackLocation(irp)					\
	do {								\
		irp->irp_currentstackloc--;				\
		irp->irp_tail.irp_overlay.irp_csl--;			\
	} while(0)

#define	IoSetCompletionRoutine(irp, func, ctx, ok, err, cancel)		\
	do {								\
		io_stack_location		*s;			\
		s = IoGetNextIrpStackLocation((irp));			\
		s->isl_completionfunc = (func);				\
		s->isl_completionctx = (ctx);				\
		s->isl_ctl = 0;						\
		if (ok) s->isl_ctl = SL_INVOKE_ON_SUCCESS;		\
		if (err) s->isl_ctl |= SL_INVOKE_ON_ERROR;		\
		if (cancel) s->isl_ctl |= SL_INVOKE_ON_CANCEL;		\
	} while(0)

#define	IoMarkIrpPending(irp)						\
	IoGetCurrentIrpStackLocation(irp)->isl_ctl |= SL_PENDING_RETURNED
#define	IoUnmarkIrpPending(irp)						\
	IoGetCurrentIrpStackLocation(irp)->isl_ctl &= ~SL_PENDING_RETURNED

#define	IoCopyCurrentIrpStackLocationToNext(irp)			\
	do {								\
		io_stack_location *src, *dst;				\
		src = IoGetCurrentIrpStackLocation(irp);		\
		dst = IoGetNextIrpStackLocation(irp);			\
		bcopy((char *)src, (char *)dst,				\
		    offsetof(io_stack_location, isl_completionfunc));	\
	} while(0)

#define	IoSkipCurrentIrpStackLocation(irp)				\
	do {								\
		(irp)->irp_currentstackloc++;				\
		(irp)->irp_tail.irp_overlay.irp_csl++;			\
	} while(0)

#define	IoInitializeDpcRequest(dobj, dpcfunc)				\
	KeInitializeDpc(&(dobj)->do_dpc, dpcfunc, dobj)

#define	IoRequestDpc(dobj, irp, ctx)					\
	KeInsertQueueDpc(&(dobj)->do_dpc, irp, ctx)

typedef uint32_t (*driver_dispatch)(device_object *, irp *);

/*
 * The driver_object is allocated once for each driver that's loaded
 * into the system. A new one is allocated for each driver and
 * populated a bit via the driver's DriverEntry function.
 * In general, a Windows DriverEntry() function will provide a pointer
 * to its AddDevice() method and set up the dispatch table.
 * For NDIS drivers, this is all done behind the scenes in the
 * NdisInitializeWrapper() and/or NdisMRegisterMiniport() routines.
 */

struct driver_object {
	uint16_t		dro_type;
	uint16_t		dro_size;
	device_object		*dro_devobj;
	uint32_t		dro_flags;
	void			*dro_driverstart;
	uint32_t		dro_driversize;
	void			*dro_driversection;
	driver_extension	*dro_driverext;
	unicode_string		dro_drivername;
	unicode_string		*dro_hwdb;
	void			*dro_pfastiodispatch;
	void			*dro_driverinitfunc;
	void			*dro_driverstartiofunc;
	void			*dro_driverunloadfunc;
	driver_dispatch		dro_dispatch[IRP_MJ_MAXIMUM_FUNCTION + 1];
};

typedef struct driver_object driver_object;

#define	DEVPROP_DEVICE_DESCRIPTION	0x00000000
#define	DEVPROP_HARDWARE_ID		0x00000001
#define	DEVPROP_COMPATIBLE_IDS		0x00000002
#define	DEVPROP_BOOTCONF		0x00000003
#define	DEVPROP_BOOTCONF_TRANSLATED	0x00000004
#define	DEVPROP_CLASS_NAME		0x00000005
#define	DEVPROP_CLASS_GUID		0x00000006
#define	DEVPROP_DRIVER_KEYNAME		0x00000007
#define	DEVPROP_MANUFACTURER		0x00000008
#define	DEVPROP_FRIENDLYNAME		0x00000009
#define	DEVPROP_LOCATION_INFO		0x0000000A
#define	DEVPROP_PHYSDEV_NAME		0x0000000B
#define	DEVPROP_BUSTYPE_GUID		0x0000000C
#define	DEVPROP_LEGACY_BUSTYPE		0x0000000D
#define	DEVPROP_BUS_NUMBER		0x0000000E
#define	DEVPROP_ENUMERATOR_NAME		0x0000000F
#define	DEVPROP_ADDRESS			0x00000010
#define	DEVPROP_UINUMBER		0x00000011
#define	DEVPROP_INSTALL_STATE		0x00000012
#define	DEVPROP_REMOVAL_POLICY		0x00000013

/* Various supported device types (used with IoCreateDevice()) */

#define	FILE_DEVICE_BEEP		0x00000001
#define	FILE_DEVICE_CD_ROM		0x00000002
#define	FILE_DEVICE_CD_ROM_FILE_SYSTEM	0x00000003
#define	FILE_DEVICE_CONTROLLER		0x00000004
#define	FILE_DEVICE_DATALINK		0x00000005
#define	FILE_DEVICE_DFS			0x00000006
#define	FILE_DEVICE_DISK		0x00000007
#define	FILE_DEVICE_DISK_FILE_SYSTEM	0x00000008
#define	FILE_DEVICE_FILE_SYSTEM		0x00000009
#define	FILE_DEVICE_INPORT_PORT		0x0000000A
#define	FILE_DEVICE_KEYBOARD		0x0000000B
#define	FILE_DEVICE_MAILSLOT		0x0000000C
#define	FILE_DEVICE_MIDI_IN		0x0000000D
#define	FILE_DEVICE_MIDI_OUT		0x0000000E
#define	FILE_DEVICE_MOUSE		0x0000000F
#define	FILE_DEVICE_MULTI_UNC_PROVIDER	0x00000010
#define	FILE_DEVICE_NAMED_PIPE		0x00000011
#define	FILE_DEVICE_NETWORK		0x00000012
#define	FILE_DEVICE_NETWORK_BROWSER	0x00000013
#define	FILE_DEVICE_NETWORK_FILE_SYSTEM	0x00000014
#define	FILE_DEVICE_NULL		0x00000015
#define	FILE_DEVICE_PARALLEL_PORT	0x00000016
#define	FILE_DEVICE_PHYSICAL_NETCARD	0x00000017
#define	FILE_DEVICE_PRINTER		0x00000018
#define	FILE_DEVICE_SCANNER		0x00000019
#define	FILE_DEVICE_SERIAL_MOUSE_PORT	0x0000001A
#define	FILE_DEVICE_SERIAL_PORT		0x0000001B
#define	FILE_DEVICE_SCREEN		0x0000001C
#define	FILE_DEVICE_SOUND		0x0000001D
#define	FILE_DEVICE_STREAMS		0x0000001E
#define	FILE_DEVICE_TAPE		0x0000001F
#define	FILE_DEVICE_TAPE_FILE_SYSTEM	0x00000020
#define	FILE_DEVICE_TRANSPORT		0x00000021
#define	FILE_DEVICE_UNKNOWN		0x00000022
#define	FILE_DEVICE_VIDEO		0x00000023
#define	FILE_DEVICE_VIRTUAL_DISK	0x00000024
#define	FILE_DEVICE_WAVE_IN		0x00000025
#define	FILE_DEVICE_WAVE_OUT		0x00000026
#define	FILE_DEVICE_8042_PORT		0x00000027
#define	FILE_DEVICE_NETWORK_REDIRECTOR	0x00000028
#define	FILE_DEVICE_BATTERY		0x00000029
#define	FILE_DEVICE_BUS_EXTENDER	0x0000002A
#define	FILE_DEVICE_MODEM		0x0000002B
#define	FILE_DEVICE_VDM			0x0000002C
#define	FILE_DEVICE_MASS_STORAGE	0x0000002D
#define	FILE_DEVICE_SMB			0x0000002E
#define	FILE_DEVICE_KS			0x0000002F
#define	FILE_DEVICE_CHANGER		0x00000030
#define	FILE_DEVICE_SMARTCARD		0x00000031
#define	FILE_DEVICE_ACPI		0x00000032
#define	FILE_DEVICE_DVD			0x00000033
#define	FILE_DEVICE_FULLSCREEN_VIDEO	0x00000034
#define	FILE_DEVICE_DFS_FILE_SYSTEM	0x00000035
#define	FILE_DEVICE_DFS_VOLUME		0x00000036
#define	FILE_DEVICE_SERENUM		0x00000037
#define	FILE_DEVICE_TERMSRV		0x00000038
#define	FILE_DEVICE_KSEC		0x00000039
#define	FILE_DEVICE_FIPS		0x0000003A

/* Device characteristics */

#define	FILE_REMOVABLE_MEDIA		0x00000001
#define	FILE_READ_ONLY_DEVICE		0x00000002
#define	FILE_FLOPPY_DISKETTE		0x00000004
#define	FILE_WRITE_ONCE_MEDIA		0x00000008
#define	FILE_REMOTE_DEVICE		0x00000010
#define	FILE_DEVICE_IS_MOUNTED		0x00000020
#define	FILE_VIRTUAL_VOLUME		0x00000040
#define	FILE_AUTOGENERATED_DEVICE_NAME	0x00000080
#define	FILE_DEVICE_SECURE_OPEN		0x00000100

/* Status codes */

#define	STATUS_SUCCESS			0x00000000
#define	STATUS_USER_APC			0x000000C0
#define	STATUS_KERNEL_APC		0x00000100
#define	STATUS_ALERTED			0x00000101
#define	STATUS_TIMEOUT			0x00000102
#define	STATUS_PENDING			0x00000103
#define	STATUS_FAILURE			0xC0000001
#define	STATUS_NOT_IMPLEMENTED		0xC0000002
#define	STATUS_INVALID_PARAMETER	0xC000000D
#define	STATUS_INVALID_DEVICE_REQUEST	0xC0000010
#define	STATUS_MORE_PROCESSING_REQUIRED	0xC0000016
#define	STATUS_NO_MEMORY		0xC0000017
#define	STATUS_BUFFER_TOO_SMALL		0xC0000023
#define	STATUS_MUTANT_NOT_OWNED		0xC0000046
#define	STATUS_NOT_SUPPORTED		0xC00000BB
#define	STATUS_INVALID_PARAMETER_2	0xC00000F0
#define	STATUS_INSUFFICIENT_RESOURCES	0xC000009A
#define	STATUS_DEVICE_NOT_CONNECTED	0xC000009D
#define	STATUS_CANCELLED		0xC0000120
#define	STATUS_NOT_FOUND		0xC0000225
#define	STATUS_DEVICE_REMOVED		0xC00002B6

#define	STATUS_WAIT_0			0x00000000

/* Memory pool types, for ExAllocatePoolWithTag() */

#define	NonPagedPool			0x00000000
#define	PagedPool			0x00000001
#define	NonPagedPoolMustSucceed		0x00000002
#define	DontUseThisType			0x00000003
#define	NonPagedPoolCacheAligned	0x00000004
#define	PagedPoolCacheAligned		0x00000005
#define	NonPagedPoolCacheAlignedMustS	0x00000006
#define	MaxPoolType			0x00000007

/*
 * IO_WORKITEM is an opaque structures that must be allocated
 * via IoAllocateWorkItem() and released via IoFreeWorkItem().
 * Consequently, we can define it any way we want.
 */
typedef void (*io_workitem_func)(device_object *, void *);

struct io_workitem {
	io_workitem_func	iw_func;
	void			*iw_ctx;
	list_entry		iw_listentry;
	device_object		*iw_dobj;
	int			iw_idx;
};

typedef struct io_workitem io_workitem;

#define	WORKQUEUE_CRITICAL	0
#define	WORKQUEUE_DELAYED	1
#define	WORKQUEUE_HYPERCRITICAL	2

#define	WORKITEM_THREADS	4
#define	WORKITEM_LEGACY_THREAD	3
#define	WORKIDX_INC(x)		(x) = (x + 1) % WORKITEM_LEGACY_THREAD

/*
 * Older, deprecated work item API, needed to support NdisQueueWorkItem().
 */

struct work_queue_item;

typedef void (*work_item_func)(struct work_queue_item *, void *);

struct work_queue_item {
	list_entry		wqi_entry;
	work_item_func		wqi_func;
	void			*wqi_ctx;
};

typedef struct work_queue_item work_queue_item;

#define	ExInitializeWorkItem(w, func, ctx)		\
	do {						\
		(w)->wqi_func = (func);			\
		(w)->wqi_ctx = (ctx);			\
		InitializeListHead(&((w)->wqi_entry));	\
	} while (0)

/*
 * FreeBSD's kernel stack is 2 pages in size by default. The
 * Windows stack is larger, so we need to give our threads more
 * stack pages. 4 should be enough, we use 8 just to extra safe.
 */
#define	NDIS_KSTACK_PAGES	8

/*
 * Different kinds of function wrapping we can do.
 */

#define	WINDRV_WRAP_STDCALL	1
#define	WINDRV_WRAP_FASTCALL	2
#define	WINDRV_WRAP_REGPARM	3
#define	WINDRV_WRAP_CDECL	4
#define	WINDRV_WRAP_AMD64	5

struct drvdb_ent {
	driver_object		*windrv_object;
	void			*windrv_devlist;
	ndis_cfg		*windrv_regvals;
	interface_type		windrv_bustype;
	STAILQ_ENTRY(drvdb_ent) link;
};

extern image_patch_table ntoskrnl_functbl[];
typedef void (*funcptr)(void);
typedef int (*matchfuncptr)(interface_type, void *, void *);

__BEGIN_DECLS
extern int windrv_libinit(void);
extern int windrv_libfini(void);
extern driver_object *windrv_lookup(vm_offset_t, char *);
extern struct drvdb_ent *windrv_match(matchfuncptr, void *);
extern int windrv_load(module_t, vm_offset_t, int, interface_type,
	void *, ndis_cfg *);
extern int windrv_unload(module_t, vm_offset_t, int);
extern int windrv_create_pdo(driver_object *, device_t);
extern void windrv_destroy_pdo(driver_object *, device_t);
extern device_object *windrv_find_pdo(driver_object *, device_t);
extern int windrv_bus_attach(driver_object *, char *);
extern int windrv_wrap(funcptr, funcptr *, int, int);
extern int windrv_unwrap(funcptr);
extern void ctxsw_utow(void);
extern void ctxsw_wtou(void);

extern int ntoskrnl_libinit(void);
extern int ntoskrnl_libfini(void);

extern void ntoskrnl_intr(void *);
extern void ntoskrnl_time(uint64_t *);

extern uint16_t ExQueryDepthSList(slist_header *);
extern slist_entry
	*InterlockedPushEntrySList(slist_header *, slist_entry *);
extern slist_entry *InterlockedPopEntrySList(slist_header *);
extern uint32_t RtlUnicodeStringToAnsiString(ansi_string *,
	unicode_string *, uint8_t);
extern uint32_t RtlAnsiStringToUnicodeString(unicode_string *,
	ansi_string *, uint8_t);
extern void RtlInitAnsiString(ansi_string *, char *);
extern void RtlInitUnicodeString(unicode_string *,
	uint16_t *);
extern void RtlFreeUnicodeString(unicode_string *);
extern void RtlFreeAnsiString(ansi_string *);
extern void KeInitializeDpc(kdpc *, void *, void *);
extern uint8_t KeInsertQueueDpc(kdpc *, void *, void *);
extern uint8_t KeRemoveQueueDpc(kdpc *);
extern void KeSetImportanceDpc(kdpc *, uint32_t);
extern void KeSetTargetProcessorDpc(kdpc *, uint8_t);
extern void KeFlushQueuedDpcs(void);
extern uint32_t KeGetCurrentProcessorNumber(void);
extern void KeInitializeTimer(ktimer *);
extern void KeInitializeTimerEx(ktimer *, uint32_t);
extern uint8_t KeSetTimer(ktimer *, int64_t, kdpc *);
extern uint8_t KeSetTimerEx(ktimer *, int64_t, uint32_t, kdpc *);
extern uint8_t KeCancelTimer(ktimer *);
extern uint8_t KeReadStateTimer(ktimer *);
extern uint32_t KeWaitForSingleObject(void *, uint32_t,
	uint32_t, uint8_t, int64_t *);
extern void KeInitializeEvent(nt_kevent *, uint32_t, uint8_t);
extern void KeClearEvent(nt_kevent *);
extern uint32_t KeReadStateEvent(nt_kevent *);
extern uint32_t KeSetEvent(nt_kevent *, uint32_t, uint8_t);
extern uint32_t KeResetEvent(nt_kevent *);
#ifdef __i386__
extern void KefAcquireSpinLockAtDpcLevel(kspin_lock *);
extern void KefReleaseSpinLockFromDpcLevel(kspin_lock *);
extern uint8_t KeAcquireSpinLockRaiseToDpc(kspin_lock *);
#else
extern void KeAcquireSpinLockAtDpcLevel(kspin_lock *);
extern void KeReleaseSpinLockFromDpcLevel(kspin_lock *);
#endif
extern void KeInitializeSpinLock(kspin_lock *);
extern uint8_t KeAcquireInterruptSpinLock(kinterrupt *);
extern void KeReleaseInterruptSpinLock(kinterrupt *, uint8_t);
extern uint8_t KeSynchronizeExecution(kinterrupt *, void *, void *);
extern uintptr_t InterlockedExchange(volatile uint32_t *,
	uintptr_t);
extern void *ExAllocatePoolWithTag(uint32_t, size_t, uint32_t);
extern void ExFreePool(void *);
extern uint32_t IoConnectInterrupt(kinterrupt **, void *, void *,
	kspin_lock *, uint32_t, uint8_t, uint8_t, uint8_t, uint8_t,
	uint32_t, uint8_t);
extern uint8_t MmIsAddressValid(void *);
extern void *MmMapIoSpace(uint64_t, uint32_t, uint32_t);
extern void MmUnmapIoSpace(void *, size_t);
extern void MmBuildMdlForNonPagedPool(mdl *);
extern void IoDisconnectInterrupt(kinterrupt *);
extern uint32_t IoAllocateDriverObjectExtension(driver_object *,
	void *, uint32_t, void **);
extern void *IoGetDriverObjectExtension(driver_object *, void *);
extern uint32_t IoCreateDevice(driver_object *, uint32_t,
	unicode_string *, uint32_t, uint32_t, uint8_t, device_object **);
extern void IoDeleteDevice(device_object *);
extern device_object *IoGetAttachedDevice(device_object *);
extern uint32_t IofCallDriver(device_object *, irp *);
extern void IofCompleteRequest(irp *, uint8_t);
extern void IoAcquireCancelSpinLock(uint8_t *);
extern void IoReleaseCancelSpinLock(uint8_t);
extern uint8_t IoCancelIrp(irp *);
extern void IoDetachDevice(device_object *);
extern device_object *IoAttachDeviceToDeviceStack(device_object *,
	device_object *);
extern mdl *IoAllocateMdl(void *, uint32_t, uint8_t, uint8_t, irp *);
extern void IoFreeMdl(mdl *);
extern io_workitem *IoAllocateWorkItem(device_object *);
extern void ExQueueWorkItem(work_queue_item *, u_int32_t);
extern void IoFreeWorkItem(io_workitem *);
extern void IoQueueWorkItem(io_workitem *, io_workitem_func,
	uint32_t, void *);

#define	IoCallDriver(a, b)		IofCallDriver(a, b)
#define	IoCompleteRequest(a, b)		IofCompleteRequest(a, b)

/*
 * On the Windows x86 arch, KeAcquireSpinLock() and KeReleaseSpinLock()
 * routines live in the HAL. We try to imitate this behavior.
 */
#ifdef __i386__
#define	KeAcquireSpinLock(a, b)	*(b) = KfAcquireSpinLock(a)
#define	KeReleaseSpinLock(a, b)	KfReleaseSpinLock(a, b)
#define	KeRaiseIrql(a, b)	*(b) = KfRaiseIrql(a)
#define	KeLowerIrql(a)		KfLowerIrql(a)
#define	KeAcquireSpinLockAtDpcLevel(a)	KefAcquireSpinLockAtDpcLevel(a)
#define	KeReleaseSpinLockFromDpcLevel(a)  KefReleaseSpinLockFromDpcLevel(a)
#endif /* __i386__ */

#ifdef __amd64__
#define	KeAcquireSpinLock(a, b)	*(b) = KfAcquireSpinLock(a)
#define	KeReleaseSpinLock(a, b)	KfReleaseSpinLock(a, b)

/*
 * These may need to be redefined later;
 * not sure where they live on amd64 yet.
 */
#define	KeRaiseIrql(a, b)	*(b) = KfRaiseIrql(a)
#define	KeLowerIrql(a)		KfLowerIrql(a)
#endif /* __amd64__ */

__END_DECLS

#endif /* _NTOSKRNL_VAR_H_ */