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drm_os_linux.h

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/**
 * \file drm_os_linux.h
 * OS abstraction macros.
 */

#include <linux/interrupt.h>  /* For task queue support */
#include <linux/delay.h>

/** Current process ID */
00010 #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 */
00014 #define DRM_READ8(map, offset)            readb(((void __iomem *)(map)->handle) + (offset))
/** Read a word from a MMIO region */
00016 #define DRM_READ16(map, offset)         readw(((void __iomem *)(map)->handle) + (offset))
/** Read a dword from a MMIO region */
00018 #define DRM_READ32(map, offset)           readl(((void __iomem *)(map)->handle) + (offset))
/** Write a byte into a MMIO region */
00020 #define DRM_WRITE8(map, offset, val)      writeb(val, ((void __iomem *)(map)->handle) + (offset))
/** Write a word into a MMIO region */
00022 #define DRM_WRITE16(map, offset, val)   writew(val, ((void __iomem *)(map)->handle) + (offset))
/** Write a dword into a MMIO region */
00024 #define DRM_WRITE32(map, offset, val)     writel(val, ((void __iomem *)(map)->handle) + (offset))
/** Read memory barrier */
00026 #define DRM_READMEMORYBARRIER()           rmb()
/** Write memory barrier */
00028 #define DRM_WRITEMEMORYBARRIER()    wmb()
/** Read/write memory barrier */
00030 #define DRM_MEMORYBARRIER()         mb()

/** IRQ handler arguments and return type and values */
00033 #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 */
00041 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

#if !(__OS_HAS_MTRR)
static __inline__ int mtrr_add(unsigned long base, unsigned long size,
                         unsigned int type, char increment)
{
      return -ENODEV;
}

static __inline__ int mtrr_del(int reg, unsigned long base, unsigned long size)
{
      return -ENODEV;
}

#define MTRR_TYPE_WRCOMB     1

#endif

/** Other copying of data to kernel space */
00066 #define DRM_COPY_FROM_USER(arg1, arg2, arg3)          \
      copy_from_user(arg1, arg2, arg3)
/** Other copying of data from kernel space */
00069 #define DRM_COPY_TO_USER(arg1, arg2, arg3)            \
      copy_to_user(arg1, arg2, arg3)
/* Macros for copyfrom user, but checking readability only once */
#define DRM_VERIFYAREA_READ( uaddr, size )            \
      (access_ok( VERIFY_READ, uaddr, size ) ? 0 : -EFAULT)
#define DRM_COPY_FROM_USER_UNCHECKED(arg1, arg2, arg3)      \
      __copy_from_user(arg1, arg2, arg3)
#define DRM_COPY_TO_USER_UNCHECKED(arg1, arg2, arg3)  \
      __copy_to_user(arg1, arg2, arg3)
#define DRM_GET_USER_UNCHECKED(val, uaddr)            \
      __get_user(val, uaddr)

#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_interruptible( queue )
#define DRM_INIT_WAITQUEUE( queue ) init_waitqueue_head( queue )

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