Pileus Git - ~andy/linux/blob - include/drm/drm_os_linux.h

   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 #ifndef readq
  10 static inline u64 readq(void __iomem *reg)
  11 {
  12         return ((u64) readl(reg)) | (((u64) readl(reg + 4UL)) << 32);
  13 }
  14
  15 static inline void writeq(u64 val, void __iomem *reg)
  16 {
  17         writel(val & 0xffffffff, reg);
  18         writel(val >> 32, reg + 0x4UL);
  19 }
  20 #endif
  21
  22 /** Current process ID */
  23 #define DRM_CURRENTPID                  task_pid_nr(current)
  24 #define DRM_SUSER(p)                    capable(CAP_SYS_ADMIN)
  25 #define DRM_UDELAY(d)                   udelay(d)
  26 /** Read a byte from a MMIO region */
  27 #define DRM_READ8(map, offset)          readb(((void __iomem *)(map)->handle) + (offset))
  28 /** Read a word from a MMIO region */
  29 #define DRM_READ16(map, offset)         readw(((void __iomem *)(map)->handle) + (offset))
  30 /** Read a dword from a MMIO region */
  31 #define DRM_READ32(map, offset)         readl(((void __iomem *)(map)->handle) + (offset))
  32 /** Write a byte into a MMIO region */
  33 #define DRM_WRITE8(map, offset, val)    writeb(val, ((void __iomem *)(map)->handle) + (offset))
  34 /** Write a word into a MMIO region */
  35 #define DRM_WRITE16(map, offset, val)   writew(val, ((void __iomem *)(map)->handle) + (offset))
  36 /** Write a dword into a MMIO region */
  37 #define DRM_WRITE32(map, offset, val)   writel(val, ((void __iomem *)(map)->handle) + (offset))
  38 /** Read memory barrier */
  39
  40 /** Read a qword from a MMIO region - be careful using these unless you really understand them */
  41 #define DRM_READ64(map, offset)         readq(((void __iomem *)(map)->handle) + (offset))
  42 /** Write a qword into a MMIO region */
  43 #define DRM_WRITE64(map, offset, val)   writeq(val, ((void __iomem *)(map)->handle) + (offset))
  44
  45 #define DRM_READMEMORYBARRIER()         rmb()
  46 /** Write memory barrier */
  47 #define DRM_WRITEMEMORYBARRIER()        wmb()
  48 /** Read/write memory barrier */
  49 #define DRM_MEMORYBARRIER()             mb()
  50
  51 /** Other copying of data to kernel space */
  52 #define DRM_COPY_FROM_USER(arg1, arg2, arg3)            \
  53         copy_from_user(arg1, arg2, arg3)
  54 /** Other copying of data from kernel space */
  55 #define DRM_COPY_TO_USER(arg1, arg2, arg3)              \
  56         copy_to_user(arg1, arg2, arg3)
  57
  58 #define DRM_WAIT_ON( ret, queue, timeout, condition )           \
  59 do {                                                            \
  60         DECLARE_WAITQUEUE(entry, current);                      \
  61         unsigned long end = jiffies + (timeout);                \
  62         add_wait_queue(&(queue), &entry);                       \
  63                                                                 \
  64         for (;;) {                                              \
  65                 __set_current_state(TASK_INTERRUPTIBLE);        \
  66                 if (condition)                                  \
  67                         break;                                  \
  68                 if (time_after_eq(jiffies, end)) {              \
  69                         ret = -EBUSY;                           \
  70                         break;                                  \
  71                 }                                               \
  72                 schedule_timeout((HZ/100 > 1) ? HZ/100 : 1);    \
  73                 if (signal_pending(current)) {                  \
  74                         ret = -EINTR;                           \
  75                         break;                                  \
  76                 }                                               \
  77         }                                                       \
  78         __set_current_state(TASK_RUNNING);                      \
  79         remove_wait_queue(&(queue), &entry);                    \
  80 } while (0)
  81
  82 #define DRM_WAKEUP( queue ) wake_up( queue )
  83 #define DRM_INIT_WAITQUEUE( queue ) init_waitqueue_head( queue )