aboutsummaryrefslogtreecommitdiff
path: root/linux-core/drm_os_linux.h
blob: 38a5769e5cdb35c273bf15acaa960d88bbe21e31 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
/**
 * \file drm_os_linux.h
 * OS abstraction macros.
 */

#define __NO_VERSION__

#include <linux/interrupt.h>	/* For task queue support */
#include <linux/delay.h>

/** File pointer type */
#define DRMFILE                         struct file *
/** Ioctl arguments */
#define DRM_IOCTL_ARGS			struct inode *inode, struct file *filp, unsigned int cmd, unsigned long data
#define DRM_ERR(d)			-(d)
/** Current process ID */
#define DRM_CURRENTPID			current->pid
#define DRM_UDELAY(d)			udelay(d)
/** Read a byte from a MMIO region */
#define DRM_READ8(map, offset)		readb(((unsigned long)(map)->handle) + (offset))
/** Read a dword from a MMIO region */
#define DRM_READ32(map, offset)		readl(((unsigned long)(map)->handle) + (offset))
/** Write a byte into a MMIO region */
#define DRM_WRITE8(map, offset, val)	writeb(val, ((unsigned long)(map)->handle) + (offset))
/** Write a dword into a MMIO region */
#define DRM_WRITE32(map, offset, val)	writel(val, ((unsigned long)(map)->handle) + (offset))
/** Read memory barrier */
#define DRM_READMEMORYBARRIER()		rmb()
/** Write memory barrier */
#define DRM_WRITEMEMORYBARRIER()	wmb()
/** Read/write memory barrier */
#define DRM_MEMORYBARRIER()		mb()
/** DRM device local declaration */
#define DRM_DEVICE	drm_file_t	*priv	= filp->private_data; \
			drm_device_t	*dev	= priv->dev

/** IRQ handler arguments and return type and values */
#define DRM_IRQ_ARGS		int irq, void *arg, struct pt_regs *regs
/** backwards compatibility with old irq return values */
#ifndef IRQ_HANDLED
typedef void irqreturn_t;
#define IRQ_HANDLED   /* nothing */
#define IRQ_NONE      /* nothing */
#endif

/** AGP types */
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,70)
#define DRM_AGP_MEM		agp_memory
#define DRM_AGP_KERN		agp_kern_info
#else
#define DRM_AGP_MEM		struct agp_memory
#define DRM_AGP_KERN		struct agp_kern_info
#endif

/** Task queue handler arguments */
#define DRM_TASKQUEUE_ARGS	void *arg

/** For data going into the kernel through the ioctl argument */
#define DRM_COPY_FROM_USER_IOCTL(arg1, arg2, arg3)	\
	if ( copy_from_user(&arg1, arg2, arg3) )	\
		return -EFAULT
/** For data going from the kernel through the ioctl argument */
#define DRM_COPY_TO_USER_IOCTL(arg1, arg2, arg3)	\
	if ( copy_to_user(arg1, &arg2, arg3) )		\
		return -EFAULT
/** Other copying of data to kernel space */
#define DRM_COPY_FROM_USER(arg1, arg2, arg3)		\
	copy_from_user(arg1, arg2, arg3)
/** Other copying of data from kernel space */
#define DRM_COPY_TO_USER(arg1, arg2, arg3)		\
	copy_to_user(arg1, arg2, arg3)
/* Macros for copyfrom user, but checking readability only once */
#define DRM_VERIFYAREA_READ( uaddr, size ) 		\
	verify_area( VERIFY_READ, uaddr, size )
#define DRM_COPY_FROM_USER_UNCHECKED(arg1, arg2, arg3) 	\
	__copy_from_user(arg1, arg2, arg3)
#define DRM_GET_USER_UNCHECKED(val, uaddr)		\
	__get_user(val, uaddr)


/** 'malloc' without the overhead of DRM(alloc)() */
#define DRM_MALLOC(x) kmalloc(x, GFP_KERNEL)
/** 'free' without the overhead of DRM(free)() */
#define DRM_FREE(x,size) kfree(x)

/** 
 * Get the pointer to the SAREA.
 *
 * Searches the SAREA on the mapping lists and points drm_device::sarea to it.
 */
#define DRM_GETSAREA()							 \
do { 									 \
	drm_map_list_t *entry;						 \
	list_for_each_entry( entry, &dev->maplist->head, head ) {	 \
		if ( entry->map &&					 \
		     entry->map->type == _DRM_SHM &&			 \
		     (entry->map->flags & _DRM_CONTAINS_LOCK) ) {	 \
			dev_priv->sarea = entry->map;			 \
 			break;						 \
 		}							 \
 	}								 \
} while (0)

#define DRM_HZ HZ

#define DRM_WAIT_ON( ret, queue, timeout, condition )		\
do {								\
	DECLARE_WAITQUEUE(entry, current);			\
	unsigned long end = jiffies + (timeout);		\
	add_wait_queue(&(queue), &entry);			\
								\
	for (;;) {						\
		current->state = TASK_INTERRUPTIBLE;		\
		if (condition)					\
			break;					\
		if (time_after_eq(jiffies, end)) {		\
			ret = -EBUSY;				\
			break;					\
		}						\
		schedule_timeout((HZ/100 > 1) ? HZ/100 : 1);	\
		if (signal_pending(current)) {			\
			ret = -EINTR;				\
			break;					\
		}						\
	}							\
	current->state = TASK_RUNNING;				\
	remove_wait_queue(&(queue), &entry);			\
} while (0)


#define DRM_WAKEUP( queue ) wake_up_interruptible( queue )
#define DRM_INIT_WAITQUEUE( queue ) init_waitqueue_head( queue )