root/include/drm/drm_os_linux.h

INCLUDED FROM

DEFINITIONS

1. mtrr_add
2. mtrr_del

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

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

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

/** IRQ handler arguments and return type and values */
#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 */
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 */
#define DRM_COPY_FROM_USER(arg1, arg2, arg3)            \
        copy_from_user(arg1, arg2, arg3)
/** Other copying of data from kernel space */
#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 )