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/**
 * \file drm.h 
 * Header for the Direct Rendering Manager
 * 
 * \author Rickard E. (Rik) Faith <faith@valinux.com>
 *
 * \par Acknowledgments:
 * Dec 1999, Richard Henderson <rth@twiddle.net>, move to generic \c cmpxchg.
 */

/*
 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
 * All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */


#ifndef _DRM_H_
#define _DRM_H_

#if defined(__linux__)
#include <linux/config.h>
#include <asm/ioctl.h>		/* For _IO* macros */
#define DRM_IOCTL_NR(n)		_IOC_NR(n)
#define DRM_IOC_VOID		_IOC_NONE
#define DRM_IOC_READ		_IOC_READ
#define DRM_IOC_WRITE		_IOC_WRITE
#define DRM_IOC_READWRITE	_IOC_READ|_IOC_WRITE
#define DRM_IOC(dir, group, nr, size) _IOC(dir, group, nr, size)
#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
#if defined(__FreeBSD__) && defined(XFree86Server)
/* Prevent name collision when including sys/ioccom.h */
#undef ioctl
#include <sys/ioccom.h>
#define ioctl(a,b,c)		xf86ioctl(a,b,c)
#else
#include <sys/ioccom.h>
#endif /* __FreeBSD__ && xf86ioctl */
#define DRM_IOCTL_NR(n)		((n) & 0xff)
#define DRM_IOC_VOID		IOC_VOID
#define DRM_IOC_READ		IOC_OUT
#define DRM_IOC_WRITE		IOC_IN
#define DRM_IOC_READWRITE	IOC_INOUT
#define DRM_IOC(dir, group, nr, size) _IOC(dir, group, nr, size)
#endif

#define XFREE86_VERSION(major,minor,patch,snap) \
		((major << 16) | (minor << 8) | patch)

#ifndef CONFIG_XFREE86_VERSION
#define CONFIG_XFREE86_VERSION XFREE86_VERSION(4,1,0,0)
#endif

#if CONFIG_XFREE86_VERSION < XFREE86_VERSION(4,1,0,0)
#define DRM_PROC_DEVICES "/proc/devices"
#define DRM_PROC_MISC	 "/proc/misc"
#define DRM_PROC_DRM	 "/proc/drm"
#define DRM_DEV_DRM	 "/dev/drm"
#define DRM_DEV_MODE	 (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP)
#define DRM_DEV_UID	 0
#define DRM_DEV_GID	 0
#endif

#if CONFIG_XFREE86_VERSION >= XFREE86_VERSION(4,1,0,0)
#ifdef __OpenBSD__
#define DRM_MAJOR       81
#else
#define DRM_MAJOR       226
#endif
#define DRM_MAX_MINOR   15
#endif
#define DRM_NAME	"drm"	  /**< Name in kernel, /dev, and /proc */
#define DRM_MIN_ORDER	5	  /**< At least 2^5 bytes = 32 bytes */
#define DRM_MAX_ORDER	22	  /**< Up to 2^22 bytes = 4MB */
#define DRM_RAM_PERCENT 10	  /**< How much system ram can we lock? */

#define _DRM_LOCK_HELD	0x80000000 /**< Hardware lock is held */
#define _DRM_LOCK_CONT	0x40000000 /**< Hardware lock is contended */
#define _DRM_LOCK_IS_HELD(lock)	   ((lock) & _DRM_LOCK_HELD)
#define _DRM_LOCK_IS_CONT(lock)	   ((lock) & _DRM_LOCK_CONT)
#define _DRM_LOCKING_CONTEXT(lock) ((lock) & ~(_DRM_LOCK_HELD|_DRM_LOCK_CONT))


typedef unsigned long drm_handle_t;
typedef unsigned int  drm_context_t;
typedef unsigned int  drm_drawable_t;
typedef unsigned int  drm_magic_t;


/**
 * Cliprect.
 * 
 * \warning: If you change this structure, make sure you change
 * XF86DRIClipRectRec in the server as well
 *
 * \note KW: Actually it's illegal to change either for
 * backwards-compatibility reasons.
 */
typedef struct drm_clip_rect {
	unsigned short	x1;
	unsigned short	y1;
	unsigned short	x2;
	unsigned short	y2;
} drm_clip_rect_t;


/**
 * Texture region,
 */
typedef struct drm_tex_region {
	unsigned char	next;
	unsigned char	prev;
	unsigned char	in_use;
	unsigned char	padding;
	unsigned int	age;
} drm_tex_region_t;


/**
 * DRM_IOCTL_VERSION ioctl argument type.
 * 
 * \sa drmGetVersion().
 */
typedef struct drm_version {
	int    version_major;	  /**< Major version */
	int    version_minor;	  /**< Minor version */
	int    version_patchlevel;/**< Patch level */
	size_t name_len;	  /**< Length of name buffer */
	char   *name;		  /**< Name of driver */
	size_t date_len;	  /**< Length of date buffer */
	char   *date;		  /**< User-space buffer to hold date */
	size_t desc_len;	  /**< Length of desc buffer */
	char   *desc;		  /**< User-space buffer to hold desc */
} drm_version_t;


/**
 * DRM_IOCTL_GET_UNIQUE ioctl argument type.
 *
 * \sa drmGetBusid() and drmSetBusId().
 */
typedef struct drm_unique {
	size_t unique_len;	  /**< Length of unique */
	char   *unique;		  /**< Unique name for driver instantiation */
} drm_unique_t;


typedef struct drm_list {
	int		 count;	  /**< Length of user-space structures */
	drm_version_t	 *version;
} drm_list_t;


typedef struct drm_block {
	int		 unused;
} drm_block_t;


/**
 * DRM_IOCTL_CONTROL ioctl argument type.
 *
 * \sa drmCtlInstHandler() and drmCtlUninstHandler().
 */
typedef struct drm_control {
	enum {
		DRM_ADD_COMMAND,
		DRM_RM_COMMAND,
		DRM_INST_HANDLER,
		DRM_UNINST_HANDLER
	}		 func;
	int		 irq;
} drm_control_t;


/**
 * Type of memory to map.
 */
typedef enum drm_map_type {
	_DRM_FRAME_BUFFER   = 0,  /**< WC (no caching), no core dump */
	_DRM_REGISTERS	    = 1,  /**< no caching, no core dump */
	_DRM_SHM	    = 2,  /**< shared, cached */
	_DRM_AGP            = 3,  /**< AGP/GART */
	_DRM_SCATTER_GATHER = 4	  /**< Scatter/gather memory for PCI DMA */
} drm_map_type_t;


/**
 * Memory mapping flags.
 */
typedef enum drm_map_flags {
	_DRM_RESTRICTED	     = 0x01, /**< Cannot be mapped to user-virtual */
	_DRM_READ_ONLY	     = 0x02,
	_DRM_LOCKED	     = 0x04, /**< shared, cached, locked */
	_DRM_KERNEL	     = 0x08, /**< kernel requires access */
	_DRM_WRITE_COMBINING = 0x10, /**< use write-combining if available */
	_DRM_CONTAINS_LOCK   = 0x20, /**< SHM page that contains lock */
	_DRM_REMOVABLE	     = 0x40  /**< Removable mapping */
} drm_map_flags_t;


typedef struct drm_ctx_priv_map {
	unsigned int	ctx_id;  /**< Context requesting private mapping */
	void		*handle; /**< Handle of map */
} drm_ctx_priv_map_t;


/**
 * DRM_IOCTL_GET_MAP, DRM_IOCTL_ADD_MAP and DRM_IOCTL_RM_MAP ioctls
 * argument type.
 *
 * \sa drmAddMap().
 */
typedef struct drm_map {
	unsigned long	offset;	 /**< Requested physical address (0 for SAREA)*/
	unsigned long	size;	 /**< Requested physical size (bytes) */
	drm_map_type_t	type;	 /**< Type of memory to map */
	drm_map_flags_t flags;	 /**< Flags */
	void		*handle; /**< User-space: "Handle" to pass to mmap() */
				 /**< Kernel-space: kernel-virtual address */
	int		mtrr;	 /**< MTRR slot used */
				 /*   Private data */
} drm_map_t;


/**
 * DRM_IOCTL_GET_CLIENT ioctl argument type.
 */
typedef struct drm_client {
	int		idx;	/**< Which client desired? */
	int		auth;	/**< Is client authenticated? */
	unsigned long	pid;	/**< Process ID */
	unsigned long	uid;	/**< User ID */
	unsigned long	magic;	/**< Magic */
	unsigned long	iocs;	/**< Ioctl count */
} drm_client_t;


typedef enum {
	_DRM_STAT_LOCK,
	_DRM_STAT_OPENS,
	_DRM_STAT_CLOSES,
	_DRM_STAT_IOCTLS,
	_DRM_STAT_LOCKS,
	_DRM_STAT_UNLOCKS,
	_DRM_STAT_VALUE,	/**< Generic value */
	_DRM_STAT_BYTE,		/**< Generic byte counter (1024bytes/K) */
	_DRM_STAT_COUNT,	/**< Generic non-byte counter (1000/k) */

	_DRM_STAT_IRQ,		/**< IRQ */
	_DRM_STAT_PRIMARY,	/**< Primary DMA bytes */
	_DRM_STAT_SECONDARY,	/**< Secondary DMA bytes */
	_DRM_STAT_DMA,		/**< DMA */
	_DRM_STAT_SPECIAL,	/**< Special DMA (e.g., priority or polled) */
	_DRM_STAT_MISSED	/**< Missed DMA opportunity */

				/* Add to the *END* of the list */
} drm_stat_type_t;


/**
 * DRM_IOCTL_GET_STATS ioctl argument type.
 */
typedef struct drm_stats {
	unsigned long count;
	struct {
		unsigned long   value;
		drm_stat_type_t type;
	} data[15];
} drm_stats_t;


/**
 * Hardware locking flags.
 */
typedef enum drm_lock_flags {
	_DRM_LOCK_READY	     = 0x01, /**< Wait until hardware is ready for DMA */
	_DRM_LOCK_QUIESCENT  = 0x02, /**< Wait until hardware quiescent */
	_DRM_LOCK_FLUSH	     = 0x04, /**< Flush this context's DMA queue first */
	_DRM_LOCK_FLUSH_ALL  = 0x08, /**< Flush all DMA queues first */
				/* These *HALT* flags aren't supported yet
				   -- they will be used to support the
				   full-screen DGA-like mode. */
	_DRM_HALT_ALL_QUEUES = 0x10, /**< Halt all current and future queues */
	_DRM_HALT_CUR_QUEUES = 0x20  /**< Halt all current queues */
} drm_lock_flags_t;


/**
 * DRM_IOCTL_LOCK, DRM_IOCTL_UNLOCK and DRM_IOCTL_FINISH ioctl argument type.
 * 
 * \sa drmGetLock() and drmUnlock().
 */
typedef struct drm_lock {
	int		 context;
	drm_lock_flags_t flags;
} drm_lock_t;


/**
 * DMA flags
 *
 * \warning 
 * These values \e must match xf86drm.h.
 *
 * \sa drm_dma.
 */
typedef enum drm_dma_flags {	      
				      /* Flags for DMA buffer dispatch */
	_DRM_DMA_BLOCK	      = 0x01, /**<
				       * Block until buffer dispatched.
				       * 
				       * \note The buffer may not yet have
				       * been processed by the hardware --
				       * getting a hardware lock with the
				       * hardware quiescent will ensure
				       * that the buffer has been
				       * processed.
				       */
	_DRM_DMA_WHILE_LOCKED = 0x02, /**< Dispatch while lock held */
	_DRM_DMA_PRIORITY     = 0x04, /**< High priority dispatch */

				      /* Flags for DMA buffer request */
	_DRM_DMA_WAIT	      = 0x10, /**< Wait for free buffers */
	_DRM_DMA_SMALLER_OK   = 0x20, /**< Smaller-than-requested buffers OK */
	_DRM_DMA_LARGER_OK    = 0x40  /**< Larger-than-requested buffers OK */
} drm_dma_flags_t;


/**
 * DRM_IOCTL_ADD_BUFS and DRM_IOCTL_MARK_BUFS ioctl argument type.
 *
 * \sa drmAddBufs().
 */
typedef struct drm_buf_desc {
	int	      count;	 /**< Number of buffers of this size */
	int	      size;	 /**< Size in bytes */