package/libdrm/0001-Add-ARM-support-into-xf86drm.h.patch

   1 From 2e3dd0040e676530f7e735fab335ff449b9b3f4d Mon Sep 17 00:00:00 2001
   2 From: Lauren Post <lauren.post@freescale.com>
   3 Date: Tue, 22 Mar 2016 22:08:25 +0100
   4 Subject: [PATCH] Add ARM support into xf86drm.h
   5
   6 This provides support for Xorg interface.  Without this the vivante
   7 samples will hang during close requiring a reboot
   8
   9 [Adapted from yocto project]
  10 Upstream-Status: Pending
  11 Signed-off-by: Lauren Post <lauren.post@freescale.com>
  12 Signed-off-by: Evan Kotara <evan.kotara@freescale.com>
  13 [Thomas: change CAS code to only be used on ARMv6/ARMv7, and not
  14 ARMv4/ARMv5, which don't support ldrex/strex. If no CAS implementation
  15 is provided libdrm falls back to a system call for locking/unlocking.]
  16 Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
  17 ---
  18  xf86drm.h | 22 ++++++++++++++++++++++
  19  1 file changed, 22 insertions(+)
  20
  21 diff --git a/xf86drm.h b/xf86drm.h
  22 index 481d882..72341f6 100644
  23 --- a/xf86drm.h
  24 +++ b/xf86drm.h
  25 @@ -469,6 +469,28 @@ do {       register unsigned int __old __asm("o0");                \
  26                 : "cr0", "memory");                     \
  27         } while (0)
  28
  29 +# elif defined (__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) \
  30 +       || defined (__ARM_ARCH_6Z__) || defined(__ARM_ARCH_6ZK__) \
  31 +       || defined (__ARM_ARCH_6K__) || defined(__ARM_ARCH_6T2__) \
  32 +       || defined (__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) \
  33 +       || defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) \
  34 +       || defined(__ARM_ARCH_7EM__)
  35 +       #undef DRM_DEV_MODE
  36 +       #define DRM_DEV_MODE     (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)
  37 +
  38 +       #define DRM_CAS(lock,old,new,__ret)             \
  39 +       do {                                            \
  40 +               __asm__ __volatile__ (                  \
  41 +                       "1: ldrex %0, [%1]\n"           \
  42 +                       "   teq %0, %2\n"               \
  43 +                       "   ite eq\n"                   \
  44 +                       "   strexeq %0, %3, [%1]\n"     \
  45 +                       "   movne   %0, #1\n"           \
  46 +               : "=&r" (__ret)                         \
  47 +               : "r" (lock), "r" (old), "r" (new)      \
  48 +               : "cc","memory");                       \
  49 +       } while (0)
  50 +
  51  #endif /* architecture */
  52  #endif /* __GNUC__ >= 2 */
  53
  54 --
  55 2.6.4
  56