3 * Header for the Direct Rendering Manager
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
7 * \par Acknowledgments:
8 * Dec 1999, Richard Henderson <rth@twiddle.net>, move to generic \c cmpxchg.
12 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
14 * All rights reserved.
16 * Permission is hereby granted, free of charge, to any person obtaining a
17 * copy of this software and associated documentation files (the "Software"),
18 * to deal in the Software without restriction, including without limitation
19 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
20 * and/or sell copies of the Software, and to permit persons to whom the
21 * Software is furnished to do so, subject to the following conditions:
23 * The above copyright notice and this permission notice (including the next
24 * paragraph) shall be included in all copies or substantial portions of the
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
30 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
31 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
32 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
33 * OTHER DEALINGS IN THE SOFTWARE.
44 #if defined(__linux__)
45 #include <linux/config.h>
46 #include <asm/ioctl.h> /* For _IO* macros */
47 #define DRM_IOCTL_NR(n) _IOC_NR(n)
48 #define DRM_IOC_VOID _IOC_NONE
49 #define DRM_IOC_READ _IOC_READ
50 #define DRM_IOC_WRITE _IOC_WRITE
51 #define DRM_IOC_READWRITE _IOC_READ|_IOC_WRITE
52 #define DRM_IOC(dir, group, nr, size) _IOC(dir, group, nr, size)
53 #elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
54 #if defined(__FreeBSD__) && defined(IN_MODULE)
55 /* Prevent name collision when including sys/ioccom.h */
57 #include <sys/ioccom.h>
58 #define ioctl(a,b,c) xf86ioctl(a,b,c)
60 #include <sys/ioccom.h>
61 #endif /* __FreeBSD__ && xf86ioctl */
62 #define DRM_IOCTL_NR(n) ((n) & 0xff)
63 #define DRM_IOC_VOID IOC_VOID
64 #define DRM_IOC_READ IOC_OUT
65 #define DRM_IOC_WRITE IOC_IN
66 #define DRM_IOC_READWRITE IOC_INOUT
67 #define DRM_IOC(dir, group, nr, size) _IOC(dir, group, nr, size)
70 #define XFREE86_VERSION(major,minor,patch,snap) \
71 ((major << 16) | (minor << 8) | patch)
73 #ifndef CONFIG_XFREE86_VERSION
74 #define CONFIG_XFREE86_VERSION XFREE86_VERSION(4,1,0,0)
77 #if CONFIG_XFREE86_VERSION < XFREE86_VERSION(4,1,0,0)
78 #define DRM_PROC_DEVICES "/proc/devices"
79 #define DRM_PROC_MISC "/proc/misc"
80 #define DRM_PROC_DRM "/proc/drm"
81 #define DRM_DEV_DRM "/dev/drm"
82 #define DRM_DEV_MODE (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP)
87 #if CONFIG_XFREE86_VERSION >= XFREE86_VERSION(4,1,0,0)
91 #if defined(__linux__) || defined(__NetBSD__)
94 #define DRM_MAX_MINOR 15
96 #define DRM_NAME "drm" /**< Name in kernel, /dev, and /proc */
97 #define DRM_MIN_ORDER 5 /**< At least 2^5 bytes = 32 bytes */
98 #define DRM_MAX_ORDER 22 /**< Up to 2^22 bytes = 4MB */
99 #define DRM_RAM_PERCENT 10 /**< How much system ram can we lock? */
101 #define _DRM_LOCK_HELD 0x80000000U /**< Hardware lock is held */
102 #define _DRM_LOCK_CONT 0x40000000U /**< Hardware lock is contended */
103 #define _DRM_LOCK_IS_HELD(lock) ((lock) & _DRM_LOCK_HELD)
104 #define _DRM_LOCK_IS_CONT(lock) ((lock) & _DRM_LOCK_CONT)
105 #define _DRM_LOCKING_CONTEXT(lock) ((lock) & ~(_DRM_LOCK_HELD|_DRM_LOCK_CONT))
108 typedef unsigned long drm_handle_t; /**< To mapped regions */
109 typedef unsigned int drm_context_t; /**< GLXContext handle */
110 typedef unsigned int drm_drawable_t;
111 typedef unsigned int drm_magic_t; /**< Magic for authentication */
117 * \warning: If you change this structure, make sure you change
118 * XF86DRIClipRectRec in the server as well
120 * \note KW: Actually it's illegal to change either for
121 * backwards-compatibility reasons.
123 typedef struct drm_clip_rect {
134 typedef struct drm_tex_region {
137 unsigned char in_use;
138 unsigned char padding;
145 * The lock structure is a simple cache-line aligned integer. To avoid
146 * processor bus contention on a multiprocessor system, there should not be any
147 * other data stored in the same cache line.
149 typedef struct drm_hw_lock {
150 __volatile__ unsigned int lock; /**< lock variable */
151 char padding[60]; /**< Pad to cache line */
155 /* This is beyond ugly, and only works on GCC. However, it allows me to use
156 * drm.h in places (i.e., in the X-server) where I can't use size_t. The real
157 * fix is to use uint32_t instead of size_t, but that fix will break existing
158 * LP64 (i.e., PowerPC64, SPARC64, IA-64, Alpha, etc.) systems. That *will*
159 * eventually happen, though. I chose 'unsigned long' to be the fallback type
160 * because that works on all the platforms I know about. Hopefully, the
161 * real fix will happen before that bites us.
165 # define DRM_SIZE_T __SIZE_TYPE__
167 # warning "__SIZE_TYPE__ not defined. Assuming sizeof(size_t) == sizeof(unsigned long)!"
168 # define DRM_SIZE_T unsigned long
172 * DRM_IOCTL_VERSION ioctl argument type.
174 * \sa drmGetVersion().
176 typedef struct drm_version {
177 int version_major; /**< Major version */
178 int version_minor; /**< Minor version */
179 int version_patchlevel;/**< Patch level */
180 DRM_SIZE_T name_len; /**< Length of name buffer */
181 char __user *name; /**< Name of driver */
182 DRM_SIZE_T date_len; /**< Length of date buffer */
183 char __user *date; /**< User-space buffer to hold date */
184 DRM_SIZE_T desc_len; /**< Length of desc buffer */
185 char __user *desc; /**< User-space buffer to hold desc */
190 * DRM_IOCTL_GET_UNIQUE ioctl argument type.
192 * \sa drmGetBusid() and drmSetBusId().
194 typedef struct drm_unique {
195 DRM_SIZE_T unique_len; /**< Length of unique */
196 char __user *unique; /**< Unique name for driver instantiation */
201 typedef struct drm_list {
202 int count; /**< Length of user-space structures */
203 drm_version_t __user *version;
207 typedef struct drm_block {
213 * DRM_IOCTL_CONTROL ioctl argument type.
215 * \sa drmCtlInstHandler() and drmCtlUninstHandler().
217 typedef struct drm_control {
229 * Type of memory to map.
231 typedef enum drm_map_type {
232 _DRM_FRAME_BUFFER = 0, /**< WC (no caching), no core dump */
233 _DRM_REGISTERS = 1, /**< no caching, no core dump */
234 _DRM_SHM = 2, /**< shared, cached */
235 _DRM_AGP = 3, /**< AGP/GART */
236 _DRM_SCATTER_GATHER = 4 /**< Scatter/gather memory for PCI DMA */
241 * Memory mapping flags.
243 typedef enum drm_map_flags {
244 _DRM_RESTRICTED = 0x01, /**< Cannot be mapped to user-virtual */
245 _DRM_READ_ONLY = 0x02,
246 _DRM_LOCKED = 0x04, /**< shared, cached, locked */
247 _DRM_KERNEL = 0x08, /**< kernel requires access */
248 _DRM_WRITE_COMBINING = 0x10, /**< use write-combining if available */
249 _DRM_CONTAINS_LOCK = 0x20, /**< SHM page that contains lock */
250 _DRM_REMOVABLE = 0x40 /**< Removable mapping */
254 typedef struct drm_ctx_priv_map {
255 unsigned int ctx_id; /**< Context requesting private mapping */
256 void *handle; /**< Handle of map */
257 } drm_ctx_priv_map_t;
261 * DRM_IOCTL_GET_MAP, DRM_IOCTL_ADD_MAP and DRM_IOCTL_RM_MAP ioctls
266 typedef struct drm_map {
267 unsigned long offset; /**< Requested physical address (0 for SAREA)*/
268 unsigned long size; /**< Requested physical size (bytes) */
269 drm_map_type_t type; /**< Type of memory to map */
270 drm_map_flags_t flags; /**< Flags */
271 void *handle; /**< User-space: "Handle" to pass to mmap() */
272 /**< Kernel-space: kernel-virtual address */
273 int mtrr; /**< MTRR slot used */
279 * DRM_IOCTL_GET_CLIENT ioctl argument type.
281 typedef struct drm_client {
282 int idx; /**< Which client desired? */
283 int auth; /**< Is client authenticated? */
284 unsigned long pid; /**< Process ID */
285 unsigned long uid; /**< User ID */
286 unsigned long magic; /**< Magic */
287 unsigned long iocs; /**< Ioctl count */
298 _DRM_STAT_VALUE, /**< Generic value */
299 _DRM_STAT_BYTE, /**< Generic byte counter (1024bytes/K) */
300 _DRM_STAT_COUNT, /**< Generic non-byte counter (1000/k) */
302 _DRM_STAT_IRQ, /**< IRQ */
303 _DRM_STAT_PRIMARY, /**< Primary DMA bytes */
304 _DRM_STAT_SECONDARY, /**< Secondary DMA bytes */
305 _DRM_STAT_DMA, /**< DMA */
306 _DRM_STAT_SPECIAL, /**< Special DMA (e.g., priority or polled) */
307 _DRM_STAT_MISSED /**< Missed DMA opportunity */
309 /* Add to the *END* of the list */
314 * DRM_IOCTL_GET_STATS ioctl argument type.
316 typedef struct drm_stats {
320 drm_stat_type_t type;
326 * Hardware locking flags.
328 typedef enum drm_lock_flags {
329 _DRM_LOCK_READY = 0x01, /**< Wait until hardware is ready for DMA */
330 _DRM_LOCK_QUIESCENT = 0x02, /**< Wait until hardware quiescent */
331 _DRM_LOCK_FLUSH = 0x04, /**< Flush this context's DMA queue first */
332 _DRM_LOCK_FLUSH_ALL = 0x08, /**< Flush all DMA queues first */
333 /* These *HALT* flags aren't supported yet
334 -- they will be used to support the
335 full-screen DGA-like mode. */
336 _DRM_HALT_ALL_QUEUES = 0x10, /**< Halt all current and future queues */
337 _DRM_HALT_CUR_QUEUES = 0x20 /**< Halt all current queues */
342 * DRM_IOCTL_LOCK, DRM_IOCTL_UNLOCK and DRM_IOCTL_FINISH ioctl argument type.
344 * \sa drmGetLock() and drmUnlock().
346 typedef struct drm_lock {
348 drm_lock_flags_t flags;
356 * These values \e must match xf86drm.h.
360 typedef enum drm_dma_flags {
361 /* Flags for DMA buffer dispatch */
362 _DRM_DMA_BLOCK = 0x01, /**<
363 * Block until buffer dispatched.
365 * \note The buffer may not yet have
366 * been processed by the hardware --
367 * getting a hardware lock with the
368 * hardware quiescent will ensure
369 * that the buffer has been
372 _DRM_DMA_WHILE_LOCKED = 0x02, /**< Dispatch while lock held */
373 _DRM_DMA_PRIORITY = 0x04, /**< High priority dispatch */
375 /* Flags for DMA buffer request */
376 _DRM_DMA_WAIT = 0x10, /**< Wait for free buffers */
377 _DRM_DMA_SMALLER_OK = 0x20, /**< Smaller-than-requested buffers OK */
378 _DRM_DMA_LARGER_OK = 0x40 /**< Larger-than-requested buffers OK */
383 * DRM_IOCTL_ADD_BUFS and DRM_IOCTL_MARK_BUFS ioctl argument type.
387 typedef struct drm_buf_desc {
388 int count; /**< Number of buffers of this size */
389 int size; /**< Size in bytes */
390 int low_mark; /**< Low water mark */
391 int high_mark; /**< High water mark */
393 _DRM_PAGE_ALIGN = 0x01, /**< Align on page boundaries for DMA */
394 _DRM_AGP_BUFFER = 0x02, /**< Buffer is in AGP space */
395 _DRM_SG_BUFFER = 0x04 /**< Scatter/gather memory buffer */
397 unsigned long agp_start; /**<
398 * Start address of where the AGP buffers are
399 * in the AGP aperture
405 * DRM_IOCTL_INFO_BUFS ioctl argument type.
407 typedef struct drm_buf_info {
408 int count; /**< Number of buffers described in list */
409 drm_buf_desc_t __user *list; /**< List of buffer descriptions */
414 * DRM_IOCTL_FREE_BUFS ioctl argument type.
416 typedef struct drm_buf_free {
427 typedef struct drm_buf_pub {
428 int idx; /**< Index into the master buffer list */
429 int total; /**< Buffer size */
430 int used; /**< Amount of buffer in use (for DMA) */
431 void __user *address; /**< Address of buffer */
436 * DRM_IOCTL_MAP_BUFS ioctl argument type.
438 typedef struct drm_buf_map {
439 int count; /**< Length of the buffer list */
440 void __user *virtual; /**< Mmap'd area in user-virtual */
441 drm_buf_pub_t __user *list; /**< Buffer information */
446 * DRM_IOCTL_DMA ioctl argument type.
448 * Indices here refer to the offset into the buffer list in drm_buf_get.
452 typedef struct drm_dma {
453 int context; /**< Context handle */
454 int send_count; /**< Number of buffers to send */
455 int __user *send_indices; /**< List of handles to buffers */
456 int __user *send_sizes; /**< Lengths of data to send */
457 drm_dma_flags_t flags; /**< Flags */
458 int request_count; /**< Number of buffers requested */
459 int request_size; /**< Desired size for buffers */
460 int __user *request_indices; /**< Buffer information */
461 int __user *request_sizes;
462 int granted_count; /**< Number of buffers granted */
467 _DRM_CONTEXT_PRESERVED = 0x01,
468 _DRM_CONTEXT_2DONLY = 0x02
473 * DRM_IOCTL_ADD_CTX ioctl argument type.
475 * \sa drmCreateContext() and drmDestroyContext().
477 typedef struct drm_ctx {
478 drm_context_t handle;
479 drm_ctx_flags_t flags;
484 * DRM_IOCTL_RES_CTX ioctl argument type.
486 typedef struct drm_ctx_res {
488 drm_ctx_t __user *contexts;
493 * DRM_IOCTL_ADD_DRAW and DRM_IOCTL_RM_DRAW ioctl argument type.
495 typedef struct drm_draw {
496 drm_drawable_t handle;
501 * DRM_IOCTL_GET_MAGIC and DRM_IOCTL_AUTH_MAGIC ioctl argument type.
503 typedef struct drm_auth {
509 * DRM_IOCTL_IRQ_BUSID ioctl argument type.
511 * \sa drmGetInterruptFromBusID().
513 typedef struct drm_irq_busid {
514 int irq; /**< IRQ number */
515 int busnum; /**< bus number */
516 int devnum; /**< device number */
517 int funcnum; /**< function number */
522 _DRM_VBLANK_ABSOLUTE = 0x0, /**< Wait for specific vblank sequence number */
523 _DRM_VBLANK_RELATIVE = 0x1, /**< Wait for given number of vblanks */
524 _DRM_VBLANK_SIGNAL = 0x40000000 /**< Send signal instead of blocking */
525 } drm_vblank_seq_type_t;
528 #define _DRM_VBLANK_FLAGS_MASK _DRM_VBLANK_SIGNAL
531 struct drm_wait_vblank_request {
532 drm_vblank_seq_type_t type;
533 unsigned int sequence;
534 unsigned long signal;
538 struct drm_wait_vblank_reply {
539 drm_vblank_seq_type_t type;
540 unsigned int sequence;
547 * DRM_IOCTL_WAIT_VBLANK ioctl argument type.
549 * \sa drmWaitVBlank().
551 typedef union drm_wait_vblank {
552 struct drm_wait_vblank_request request;
553 struct drm_wait_vblank_reply reply;
558 * DRM_IOCTL_AGP_ENABLE ioctl argument type.
560 * \sa drmAgpEnable().
562 typedef struct drm_agp_mode {
563 unsigned long mode; /**< AGP mode */
568 * DRM_IOCTL_AGP_ALLOC and DRM_IOCTL_AGP_FREE ioctls argument type.
570 * \sa drmAgpAlloc() and drmAgpFree().
572 typedef struct drm_agp_buffer {
573 unsigned long size; /**< In bytes -- will round to page boundary */
574 unsigned long handle; /**< Used for binding / unbinding */
575 unsigned long type; /**< Type of memory to allocate */
576 unsigned long physical; /**< Physical used by i810 */
581 * DRM_IOCTL_AGP_BIND and DRM_IOCTL_AGP_UNBIND ioctls argument type.
583 * \sa drmAgpBind() and drmAgpUnbind().
585 typedef struct drm_agp_binding {
586 unsigned long handle; /**< From drm_agp_buffer */
587 unsigned long offset; /**< In bytes -- will round to page boundary */
592 * DRM_IOCTL_AGP_INFO ioctl argument type.
594 * \sa drmAgpVersionMajor(), drmAgpVersionMinor(), drmAgpGetMode(),
595 * drmAgpBase(), drmAgpSize(), drmAgpMemoryUsed(), drmAgpMemoryAvail(),
596 * drmAgpVendorId() and drmAgpDeviceId().
598 typedef struct drm_agp_info {
599 int agp_version_major;
600 int agp_version_minor;
602 unsigned long aperture_base; /* physical address */
603 unsigned long aperture_size; /* bytes */
604 unsigned long memory_allowed; /* bytes */
605 unsigned long memory_used;
607 /* PCI information */
608 unsigned short id_vendor;
609 unsigned short id_device;
614 * DRM_IOCTL_SG_ALLOC ioctl argument type.
616 typedef struct drm_scatter_gather {
617 unsigned long size; /**< In bytes -- will round to page boundary */
618 unsigned long handle; /**< Used for mapping / unmapping */
619 } drm_scatter_gather_t;
622 * DRM_IOCTL_SET_VERSION ioctl argument type.
624 typedef struct drm_set_version {
632 #define DRM_IOCTL_BASE 'd'
633 #define DRM_IO(nr) _IO(DRM_IOCTL_BASE,nr)
634 #define DRM_IOR(nr,type) _IOR(DRM_IOCTL_BASE,nr,type)
635 #define DRM_IOW(nr,type) _IOW(DRM_IOCTL_BASE,nr,type)
636 #define DRM_IOWR(nr,type) _IOWR(DRM_IOCTL_BASE,nr,type)
638 #define DRM_IOCTL_VERSION DRM_IOWR(0x00, drm_version_t)
639 #define DRM_IOCTL_GET_UNIQUE DRM_IOWR(0x01, drm_unique_t)
640 #define DRM_IOCTL_GET_MAGIC DRM_IOR( 0x02, drm_auth_t)
641 #define DRM_IOCTL_IRQ_BUSID DRM_IOWR(0x03, drm_irq_busid_t)
642 #define DRM_IOCTL_GET_MAP DRM_IOWR(0x04, drm_map_t)
643 #define DRM_IOCTL_GET_CLIENT DRM_IOWR(0x05, drm_client_t)
644 #define DRM_IOCTL_GET_STATS DRM_IOR( 0x06, drm_stats_t)
645 #define DRM_IOCTL_SET_VERSION DRM_IOWR(0x07, drm_set_version_t)
647 #define DRM_IOCTL_SET_UNIQUE DRM_IOW( 0x10, drm_unique_t)
648 #define DRM_IOCTL_AUTH_MAGIC DRM_IOW( 0x11, drm_auth_t)
649 #define DRM_IOCTL_BLOCK DRM_IOWR(0x12, drm_block_t)
650 #define DRM_IOCTL_UNBLOCK DRM_IOWR(0x13, drm_block_t)
651 #define DRM_IOCTL_CONTROL DRM_IOW( 0x14, drm_control_t)
652 #define DRM_IOCTL_ADD_MAP DRM_IOWR(0x15, drm_map_t)
653 #define DRM_IOCTL_ADD_BUFS DRM_IOWR(0x16, drm_buf_desc_t)
654 #define DRM_IOCTL_MARK_BUFS DRM_IOW( 0x17, drm_buf_desc_t)
655 #define DRM_IOCTL_INFO_BUFS DRM_IOWR(0x18, drm_buf_info_t)
656 #define DRM_IOCTL_MAP_BUFS DRM_IOWR(0x19, drm_buf_map_t)
657 #define DRM_IOCTL_FREE_BUFS DRM_IOW( 0x1a, drm_buf_free_t)
659 #define DRM_IOCTL_RM_MAP DRM_IOW( 0x1b, drm_map_t)
661 #define DRM_IOCTL_SET_SAREA_CTX DRM_IOW( 0x1c, drm_ctx_priv_map_t)
662 #define DRM_IOCTL_GET_SAREA_CTX DRM_IOWR(0x1d, drm_ctx_priv_map_t)
664 #define DRM_IOCTL_ADD_CTX DRM_IOWR(0x20, drm_ctx_t)
665 #define DRM_IOCTL_RM_CTX DRM_IOWR(0x21, drm_ctx_t)
666 #define DRM_IOCTL_MOD_CTX DRM_IOW( 0x22, drm_ctx_t)
667 #define DRM_IOCTL_GET_CTX DRM_IOWR(0x23, drm_ctx_t)
668 #define DRM_IOCTL_SWITCH_CTX DRM_IOW( 0x24, drm_ctx_t)
669 #define DRM_IOCTL_NEW_CTX DRM_IOW( 0x25, drm_ctx_t)
670 #define DRM_IOCTL_RES_CTX DRM_IOWR(0x26, drm_ctx_res_t)
671 #define DRM_IOCTL_ADD_DRAW DRM_IOWR(0x27, drm_draw_t)
672 #define DRM_IOCTL_RM_DRAW DRM_IOWR(0x28, drm_draw_t)
673 #define DRM_IOCTL_DMA DRM_IOWR(0x29, drm_dma_t)
674 #define DRM_IOCTL_LOCK DRM_IOW( 0x2a, drm_lock_t)
675 #define DRM_IOCTL_UNLOCK DRM_IOW( 0x2b, drm_lock_t)
676 #define DRM_IOCTL_FINISH DRM_IOW( 0x2c, drm_lock_t)
678 #define DRM_IOCTL_AGP_ACQUIRE DRM_IO( 0x30)
679 #define DRM_IOCTL_AGP_RELEASE DRM_IO( 0x31)
680 #define DRM_IOCTL_AGP_ENABLE DRM_IOW( 0x32, drm_agp_mode_t)
681 #define DRM_IOCTL_AGP_INFO DRM_IOR( 0x33, drm_agp_info_t)
682 #define DRM_IOCTL_AGP_ALLOC DRM_IOWR(0x34, drm_agp_buffer_t)
683 #define DRM_IOCTL_AGP_FREE DRM_IOW( 0x35, drm_agp_buffer_t)
684 #define DRM_IOCTL_AGP_BIND DRM_IOW( 0x36, drm_agp_binding_t)
685 #define DRM_IOCTL_AGP_UNBIND DRM_IOW( 0x37, drm_agp_binding_t)
687 #define DRM_IOCTL_SG_ALLOC DRM_IOW( 0x38, drm_scatter_gather_t)
688 #define DRM_IOCTL_SG_FREE DRM_IOW( 0x39, drm_scatter_gather_t)
690 #define DRM_IOCTL_WAIT_VBLANK DRM_IOWR(0x3a, drm_wait_vblank_t)
693 * Device specific ioctls should only be in their respective headers
694 * The device specific ioctl range is from 0x40 to 0x79.
696 * \sa drmCommandNone(), drmCommandRead(), drmCommandWrite(), and
697 * drmCommandReadWrite().
699 #define DRM_COMMAND_BASE 0x40