1/**
  2 * \file drm_os_linux.h
  3 * OS abstraction macros.
  4 */
  5
  6#include <linux/interrupt.h>	/* For task queue support */
  7#include <linux/delay.h>
  8
  9#ifndef readq
 10static inline u64 readq(void __iomem *reg)
 11{
 12	return ((u64) readl(reg)) | (((u64) readl(reg + 4UL)) << 32);
 13}
 14
 15static inline void writeq(u64 val, void __iomem *reg)
 16{
 17	writel(val & 0xffffffff, reg);
 18	writel(val >> 32, reg + 0x4UL);
 19}
 20#endif
 21
 22/** Current process ID */
 23#define DRM_CURRENTPID			task_pid_nr(current)
 24#define DRM_SUSER(p)			capable(CAP_SYS_ADMIN)
 25#define DRM_UDELAY(d)			udelay(d)
 26/** Read a byte from a MMIO region */
 27#define DRM_READ8(map, offset)		readb(((void __iomem *)(map)->handle) + (offset))
 28/** Read a word from a MMIO region */
 29#define DRM_READ16(map, offset)         readw(((void __iomem *)(map)->handle) + (offset))
 30/** Read a dword from a MMIO region */
 31#define DRM_READ32(map, offset)		readl(((void __iomem *)(map)->handle) + (offset))
 32/** Write a byte into a MMIO region */
 33#define DRM_WRITE8(map, offset, val)	writeb(val, ((void __iomem *)(map)->handle) + (offset))
 34/** Write a word into a MMIO region */
 35#define DRM_WRITE16(map, offset, val)   writew(val, ((void __iomem *)(map)->handle) + (offset))
 36/** Write a dword into a MMIO region */
 37#define DRM_WRITE32(map, offset, val)	writel(val, ((void __iomem *)(map)->handle) + (offset))
 38/** Read memory barrier */
 39
 40/** Read a qword from a MMIO region - be careful using these unless you really understand them */
 41#define DRM_READ64(map, offset)		readq(((void __iomem *)(map)->handle) + (offset))
 42/** Write a qword into a MMIO region */
 43#define DRM_WRITE64(map, offset, val)	writeq(val, ((void __iomem *)(map)->handle) + (offset))
 44
 45#define DRM_READMEMORYBARRIER()		rmb()
 46/** Write memory barrier */
 47#define DRM_WRITEMEMORYBARRIER()	wmb()
 48/** Read/write memory barrier */
 49#define DRM_MEMORYBARRIER()		mb()
 50
 51/** IRQ handler arguments and return type and values */
 52#define DRM_IRQ_ARGS		int irq, void *arg
 53
 54/** AGP types */
 55#if __OS_HAS_AGP
 56#define DRM_AGP_MEM		struct agp_memory
 57#define DRM_AGP_KERN		struct agp_kern_info
 58#else
 59/* define some dummy types for non AGP supporting kernels */
 60struct no_agp_kern {
 61	unsigned long aper_base;
 62	unsigned long aper_size;
 63};
 64#define DRM_AGP_MEM             int
 65#define DRM_AGP_KERN            struct no_agp_kern
 66#endif
 67
 68#if !(__OS_HAS_MTRR)
 69static __inline__ int mtrr_add(unsigned long base, unsigned long size,
 70			       unsigned int type, char increment)
 71{
 72	return -ENODEV;
 73}
 74
 75static __inline__ int mtrr_del(int reg, unsigned long base, unsigned long size)
 76{
 77	return -ENODEV;
 78}
 79
 80#define MTRR_TYPE_WRCOMB     1
 81
 82#endif
 83
 84/** Other copying of data to kernel space */
 85#define DRM_COPY_FROM_USER(arg1, arg2, arg3)		\
 86	copy_from_user(arg1, arg2, arg3)
 87/** Other copying of data from kernel space */
 88#define DRM_COPY_TO_USER(arg1, arg2, arg3)		\
 89	copy_to_user(arg1, arg2, arg3)
 90/* Macros for copyfrom user, but checking readability only once */
 91#define DRM_VERIFYAREA_READ( uaddr, size )		\
 92	(access_ok( VERIFY_READ, uaddr, size ) ? 0 : -EFAULT)
 93#define DRM_COPY_FROM_USER_UNCHECKED(arg1, arg2, arg3)	\
 94	__copy_from_user(arg1, arg2, arg3)
 95#define DRM_COPY_TO_USER_UNCHECKED(arg1, arg2, arg3)	\
 96	__copy_to_user(arg1, arg2, arg3)
 97#define DRM_GET_USER_UNCHECKED(val, uaddr)		\
 98	__get_user(val, uaddr)
 99
100#define DRM_HZ HZ
101
102#define DRM_WAIT_ON( ret, queue, timeout, condition )		\
103do {								\
104	DECLARE_WAITQUEUE(entry, current);			\
105	unsigned long end = jiffies + (timeout);		\
106	add_wait_queue(&(queue), &entry);			\
107								\
108	for (;;) {						\
109		__set_current_state(TASK_INTERRUPTIBLE);	\
110		if (condition)					\
111			break;					\
112		if (time_after_eq(jiffies, end)) {		\
113			ret = -EBUSY;				\
114			break;					\
115		}						\
116		schedule_timeout((HZ/100 > 1) ? HZ/100 : 1);	\
117		if (signal_pending(current)) {			\
118			ret = -EINTR;				\
119			break;					\
120		}						\
121	}							\
122	__set_current_state(TASK_RUNNING);			\
123	remove_wait_queue(&(queue), &entry);			\
124} while (0)
125
126#define DRM_WAKEUP( queue ) wake_up( queue )
127#define DRM_INIT_WAITQUEUE( queue ) init_waitqueue_head( queue )