Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / include / drm / drm_os_linux.h

diff --git a/kernel/include/drm/drm_os_linux.h b/kernel/include/drm/drm_os_linux.h
new file mode 100644 (file)
index 0000000..86ab99b
--- /dev/null
+++ b/kernel/include/drm/drm_os_linux.h
@@ -0,0 +1,65 @@
+/**
+ * \file drm_os_linux.h
+ * OS abstraction macros.
+ */
+
+#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
+
+/** Current process ID */
+#define DRM_CURRENTPID                 task_pid_nr(current)
+#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 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 {                                                           \
+       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)