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

#include <linux/interrupt.h>    /* For task queue support */
#include <linux/sched/signal.h>
#include <linux/delay.h>
#include <linux/io-64-nonatomic-lo-hi.h>

/* Handle the DRM options from kernel config. */
#ifdef __DragonFly__
#include "opt_drm.h"
#ifdef DRM_DEBUG_DEFAULT
#  if DRM_DEBUG_DEFAULT>1
#    define DRM_DEBUG_DEFAULT_ON 2
#  else
#    define DRM_DEBUG_DEFAULT_ON 1
#  endif
#undef DRM_DEBUG_DEFAULT
#else /* !DRM_DEBUG_DEFAULT */
#  define DRM_DEBUG_DEFAULT_ON 0
#endif /* DRM_DEBUG_DEFAULT */
#endif /* __DragonFly__ */

/** Current process ID */
#define DRM_CURRENTPID                  (curproc != NULL ? curproc->p_pid : -1)
#define DRM_UDELAY(d)                   DELAY(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 a qword from a MMIO region - be careful using these unless you really understand them */
#define DRM_READ64(map, offset)         readq(((void __iomem *)(map)->handle) + (offset))
/** Write a qword into a MMIO region */
#define DRM_WRITE64(map, offset, val)   writeq(val, ((void __iomem *)(map)->handle) + (offset))

#define DRM_WAIT_ON( ret, queue, timeout, condition )           \
do {                                                            \
        wait_queue_entry_t entry = {                            \
                .private        = current,                      \
                .func           = default_wake_function,        \
        };                                                      \
        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)