LXR linux/drivers/char/drm/drm_os

   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                  task_pid_nr(current)
  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 */
  41struct 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)
  50static __inline__ int mtrr_add(unsigned long base, unsigned long size,
  51                               unsigned int type, char increment)
  52{
  53        return -ENODEV;
  54}
  55
  56static __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/** 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
  81#define DRM_HZ HZ
  82
  83#define DRM_WAIT_ON( ret, queue, timeout, condition )           \
  84do {                                                            \
  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
 107#define DRM_WAKEUP( queue ) wake_up_interruptible( queue )
 108#define DRM_INIT_WAITQUEUE( queue ) init_waitqueue_head( queue )
 109