/** * \file drm_os_linux.h * OS abstraction macros. */ #include <linux/interrupt.h>	/* For task queue support */#include <linux/delay.h> #ifndef readqstatic inline u64 readq(void __iomem *reg){	return ((u64) readl(reg)) | (((u64) readl(reg + 4UL)) << 32);} static inline void writeq(u64 val, void __iomem *reg){	writel(val & 0xffffffff, reg);	writel(val >> 32, reg + 0x4UL);}#endif /** 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 */ /** Read a qword from a MMIO region - be careful using these unless you really understand them */#define DRM_READ64(map, offset)		readq(((void __iomem *)(map)->handle) + (offset))/** Write a qword into a MMIO region */#define DRM_WRITE64(map, offset, val)	writeq(val, ((void __iomem *)(map)->handle) + (offset)) #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 /** 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) #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( queue )#define DRM_INIT_WAITQUEUE( queue ) init_waitqueue_head( queue )