/** * \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_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 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_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)