drm_os_linux.h

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

#ifndef readq
static 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

#define DRM_CURRENTPID          task_pid_nr(current)
#define DRM_SUSER(p)            capable(CAP_SYS_ADMIN)
#define DRM_UDELAY(d)           udelay(d)

#define DRM_READ8(map, offset)      readb(((void __iomem *)(map)->handle) + (offset))

#define DRM_READ16(map, offset)         readw(((void __iomem *)(map)->handle) + (offset))

#define DRM_READ32(map, offset)     readl(((void __iomem *)(map)->handle) + (offset))

#define DRM_WRITE8(map, offset, val)    writeb(val, ((void __iomem *)(map)->handle) + (offset))

#define DRM_WRITE16(map, offset, val)   writew(val, ((void __iomem *)(map)->handle) + (offset))

#define DRM_WRITE32(map, offset, val)   writel(val, ((void __iomem *)(map)->handle) + (offset))

#define DRM_READ64(map, offset)     readq(((void __iomem *)(map)->handle) + (offset))

#define DRM_WRITE64(map, offset, val)   writeq(val, ((void __iomem *)(map)->handle) + (offset))

#define DRM_READMEMORYBARRIER()     rmb()

#define DRM_WRITEMEMORYBARRIER()    wmb()

#define DRM_MEMORYBARRIER()     mb()

#define DRM_IRQ_ARGS        int irq, void *arg

#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 */
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

#define DRM_COPY_FROM_USER(arg1, arg2, arg3)        \
    copy_from_user(arg1, arg2, arg3)

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