drivers/char/drm/drm_os_linux.h

   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 /** Current process ID */
  10 #define DRM_CURRENTPID                  current->pid
  11 #define DRM_SUSER(p)                    capable(CAP_SYS_ADMIN)
  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()
  31
  32 /** IRQ handler arguments and return type and values */
  33 #define DRM_IRQ_ARGS            int irq, void *arg
  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 {
  42         unsigned long aper_base;
  43         unsigned long aper_size;
  44 };
  45 #define DRM_AGP_MEM             int
  46 #define DRM_AGP_KERN            struct no_agp_kern
  47 #endif
  48
  49 #if !(__OS_HAS_MTRR)
  50 static __inline__ int mtrr_add(unsigned long base, unsigned long size,
  51                                unsigned int type, char increment)
  52 {
  53         return -ENODEV;
  54 }
  55
  56 static __inline__ int mtrr_del(int reg, unsigned long base, unsigned long size)
  57 {
  58         return -ENODEV;
  59 }
  60
  61 #define MTRR_TYPE_WRCOMB     1
  62
  63 #endif
  64
  65 /** For data going into the kernel through the ioctl argument */
  66 #define DRM_COPY_FROM_USER_IOCTL(arg1, arg2, arg3)      \
  67         if ( copy_from_user(&arg1, arg2, arg3) )        \
  68                 return -EFAULT
  69 /** For data going from the kernel through the ioctl argument */
  70 #define DRM_COPY_TO_USER_IOCTL(arg1, arg2, arg3)        \
  71         if ( copy_to_user(arg1, &arg2, arg3) )          \
  72                 return -EFAULT
  73 /** Other copying of data to kernel space */
  74 #define DRM_COPY_FROM_USER(arg1, arg2, arg3)            \
  75         copy_from_user(arg1, arg2, arg3)
  76 /** Other copying of data from kernel space */
  77 #define DRM_COPY_TO_USER(arg1, arg2, arg3)              \
  78         copy_to_user(arg1, arg2, arg3)
  79 /* Macros for copyfrom user, but checking readability only once */
  80 #define DRM_VERIFYAREA_READ( uaddr, size )              \
  81         (access_ok( VERIFY_READ, uaddr, size ) ? 0 : -EFAULT)
  82 #define DRM_COPY_FROM_USER_UNCHECKED(arg1, arg2, arg3)  \
  83         __copy_from_user(arg1, arg2, arg3)
  84 #define DRM_COPY_TO_USER_UNCHECKED(arg1, arg2, arg3)    \
  85         __copy_to_user(arg1, arg2, arg3)
  86 #define DRM_GET_USER_UNCHECKED(val, uaddr)              \
  87         __get_user(val, uaddr)
  88
  89 #define DRM_HZ HZ
  90
  91 #define DRM_WAIT_ON( ret, queue, timeout, condition )           \
  92 do {                                                            \
  93         DECLARE_WAITQUEUE(entry, current);                      \
  94         unsigned long end = jiffies + (timeout);                \
  95         add_wait_queue(&(queue), &entry);                       \
  96                                                                 \
  97         for (;;) {                                              \
  98                 __set_current_state(TASK_INTERRUPTIBLE);        \
  99                 if (condition)                                  \
 100                         break;                                  \
 101                 if (time_after_eq(jiffies, end)) {              \
 102                         ret = -EBUSY;                           \
 103                         break;                                  \
 104                 }                                               \
 105                 schedule_timeout((HZ/100 > 1) ? HZ/100 : 1);    \
 106                 if (signal_pending(current)) {                  \
 107                         ret = -EINTR;                           \
 108                         break;                                  \
 109                 }                                               \
 110         }                                                       \
 111         __set_current_state(TASK_RUNNING);                      \
 112         remove_wait_queue(&(queue), &entry);                    \
 113 } while (0)
 114
 115 #define DRM_WAKEUP( queue ) wake_up_interruptible( queue )
 116 #define DRM_INIT_WAITQUEUE( queue ) init_waitqueue_head( queue )