[net-next-2.6.git] / drivers / char / drm / drm_os_linux.h

/**
 * \file drm_os_linux.h
 * OS abstraction macros.
 */

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

/** Current process ID */
#define DRM_CURRENTPID			task_pid_nr(current)
#define DRM_SUSER(p)			capable(CAP_SYS_ADMIN)
#define DRM_UDELAY(d)			udelay(d)
/** Read a byte from a MMIO region */
#define DRM_READ8(map, offset)		readb(((void __iomem *)(map)->handle) + (offset))
/** Read a word from a MMIO region */
#define DRM_READ16(map, offset)         readw(((void __iomem *)(map)->handle) + (offset))
/** Read a dword from a MMIO region */
#define DRM_READ32(map, offset)		readl(((void __iomem *)(map)->handle) + (offset))
/** Write a byte into a MMIO region */
#define DRM_WRITE8(map, offset, val)	writeb(val, ((void __iomem *)(map)->handle) + (offset))
/** Write a word into a MMIO region */
#define DRM_WRITE16(map, offset, val)   writew(val, ((void __iomem *)(map)->handle) + (offset))
/** Write a dword into a MMIO region */
#define DRM_WRITE32(map, offset, val)	writel(val, ((void __iomem *)(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()

/** IRQ handler arguments and return type and values */
#define DRM_IRQ_ARGS		int irq, void *arg

/** AGP types */
#if __OS_HAS_AGP
#define DRM_AGP_MEM		struct agp_memory
#define DRM_AGP_KERN		struct agp_kern_info
#else
/* define some dummy types for non AGP supporting kernels */
struct no_agp_kern {
	unsigned long aper_base;
	unsigned long aper_size;
};
#define DRM_AGP_MEM             int
#define DRM_AGP_KERN            struct no_agp_kern
#endif

#if !(__OS_HAS_MTRR)
static __inline__ int mtrr_add(unsigned long base, unsigned long size,
			       unsigned int type, char increment)
{
	return -ENODEV;
}

static __inline__ int mtrr_del(int reg, unsigned long base, unsigned long size)
{
	return -ENODEV;
}

#define MTRR_TYPE_WRCOMB     1

#endif

/** 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 ) 		\
	(access_ok( VERIFY_READ, uaddr, size ) ? 0 : -EFAULT)
#define DRM_COPY_FROM_USER_UNCHECKED(arg1, arg2, arg3) 	\
	__copy_from_user(arg1, arg2, arg3)
#define DRM_COPY_TO_USER_UNCHECKED(arg1, arg2, arg3)	\
	__copy_to_user(arg1, arg2, arg3)
#define DRM_GET_USER_UNCHECKED(val, uaddr)		\
	__get_user(val, uaddr)

#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 (;;) {						\
		__set_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;					\
		}						\
	}							\
	__set_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 )
Commit	Line	Data
1da177e4 LT	1	/**
	2	* \file drm_os_linux.h
	3	* OS abstraction macros.
	4	*/
	5
1da177e4 LT	6	#include <linux/interrupt.h> /* For task queue support */
	7	#include <linux/delay.h>
	8
1da177e4	9	/** Current process ID */
ba25f9dc	10	#define DRM_CURRENTPID task_pid_nr(current)
92514243	11	#define DRM_SUSER(p) capable(CAP_SYS_ADMIN)
1da177e4 LT	12	#define DRM_UDELAY(d) udelay(d)
	13	/** Read a byte from a MMIO region */
	14	#define DRM_READ8(map, offset) readb(((void __iomem *)(map)->handle) + (offset))
	15	/** Read a word from a MMIO region */
	16	#define DRM_READ16(map, offset) readw(((void __iomem *)(map)->handle) + (offset))
	17	/** Read a dword from a MMIO region */
	18	#define DRM_READ32(map, offset) readl(((void __iomem *)(map)->handle) + (offset))
	19	/** Write a byte into a MMIO region */
	20	#define DRM_WRITE8(map, offset, val) writeb(val, ((void __iomem *)(map)->handle) + (offset))
	21	/** Write a word into a MMIO region */
	22	#define DRM_WRITE16(map, offset, val) writew(val, ((void __iomem *)(map)->handle) + (offset))
	23	/** Write a dword into a MMIO region */
	24	#define DRM_WRITE32(map, offset, val) writel(val, ((void __iomem *)(map)->handle) + (offset))
	25	/** Read memory barrier */
	26	#define DRM_READMEMORYBARRIER() rmb()
	27	/** Write memory barrier */
	28	#define DRM_WRITEMEMORYBARRIER() wmb()
	29	/** Read/write memory barrier */
	30	#define DRM_MEMORYBARRIER() mb()
1da177e4 LT	31
1da177e4 LT	32	/** IRQ handler arguments and return type and values */
7d12e780	33	#define DRM_IRQ_ARGS int irq, void *arg
1da177e4 LT	34
	35	/** AGP types */
	36	#if __OS_HAS_AGP
	37	#define DRM_AGP_MEM struct agp_memory
	38	#define DRM_AGP_KERN struct agp_kern_info
	39	#else
	40	/* define some dummy types for non AGP supporting kernels */
	41	struct no_agp_kern {
b5e89ed5 DA	42	unsigned long aper_base;
b5e89ed5 DA	43	unsigned long aper_size;
1da177e4 LT	44	};
	45	#define DRM_AGP_MEM int
	46	#define DRM_AGP_KERN struct no_agp_kern
	47	#endif
	48
	49	#if !(__OS_HAS_MTRR)
b5e89ed5 DA	50	static __inline__ int mtrr_add(unsigned long base, unsigned long size,
b5e89ed5 DA	51	unsigned int type, char increment)
1da177e4 LT	52	{
	53	return -ENODEV;
	54	}
	55
b5e89ed5	56	static __inline__ int mtrr_del(int reg, unsigned long base, unsigned long size)
1da177e4 LT	57	{
	58	return -ENODEV;
	59	}
b5e89ed5	60
1da177e4 LT	61	#define MTRR_TYPE_WRCOMB 1
	62
	63	#endif
	64
1da177e4 LT	65	/** Other copying of data to kernel space */
	66	#define DRM_COPY_FROM_USER(arg1, arg2, arg3) \
	67	copy_from_user(arg1, arg2, arg3)
	68	/** Other copying of data from kernel space */
	69	#define DRM_COPY_TO_USER(arg1, arg2, arg3) \
	70	copy_to_user(arg1, arg2, arg3)
	71	/* Macros for copyfrom user, but checking readability only once */
	72	#define DRM_VERIFYAREA_READ( uaddr, size ) \
	73	(access_ok( VERIFY_READ, uaddr, size ) ? 0 : -EFAULT)
	74	#define DRM_COPY_FROM_USER_UNCHECKED(arg1, arg2, arg3) \
	75	__copy_from_user(arg1, arg2, arg3)
	76	#define DRM_COPY_TO_USER_UNCHECKED(arg1, arg2, arg3) \
	77	__copy_to_user(arg1, arg2, arg3)
	78	#define DRM_GET_USER_UNCHECKED(val, uaddr) \
	79	__get_user(val, uaddr)
	80
1da177e4 LT	81	#define DRM_HZ HZ
	82
	83	#define DRM_WAIT_ON( ret, queue, timeout, condition ) \
	84	do { \
	85	DECLARE_WAITQUEUE(entry, current); \
	86	unsigned long end = jiffies + (timeout); \
	87	add_wait_queue(&(queue), &entry); \
	88	\
	89	for (;;) { \
	90	__set_current_state(TASK_INTERRUPTIBLE); \
	91	if (condition) \
	92	break; \
	93	if (time_after_eq(jiffies, end)) { \
	94	ret = -EBUSY; \
	95	break; \
	96	} \
	97	schedule_timeout((HZ/100 > 1) ? HZ/100 : 1); \
	98	if (signal_pending(current)) { \
	99	ret = -EINTR; \
	100	break; \
	101	} \
	102	} \
	103	__set_current_state(TASK_RUNNING); \
	104	remove_wait_queue(&(queue), &entry); \
	105	} while (0)
	106
1da177e4 LT	107	#define DRM_WAKEUP( queue ) wake_up_interruptible( queue )
1da177e4 LT	108	#define DRM_INIT_WAITQUEUE( queue ) init_waitqueue_head( queue )