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Add ARM support into xf86drm.h 

This provides support for Xorg interface.  Without this the vivante
samples will hang during close requiring a reboot

[Adapted from yocto project]
Upstream-Status: Pending
Signed-off-by: Lauren Post <lauren.post@freescale.com>
Signed-off-by: Evan Kotara <evan.kotara@freescale.com>
[Thomas: change CAS code to only be used on ARMv6/ARMv7, and not
ARMv4/ARMv5, which don't support ldrex/strex. If no CAS implementation
is provided libdrm falls back to a system call for locking/unlocking.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Acked-by: Eric Engestrom <eric.engestrom@intel.com>
---
Changes v1 -> v2:
  - add comment explaining exclusion of ARMv4/ARMv5 and lower
main
Lauren Post 2016-03-22 22:08:25 +01:00 committed by Peter Seiderer
parent 8de2696213
commit 8c1185d22c
1 changed files with 23 additions and 0 deletions
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xf86drm.h
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@ -481,6 +481,29 @@ do { register unsigned int __old __asm("o0"); \
: "cr0", "memory"); \
} while (0)
# elif defined (__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) \
|| defined (__ARM_ARCH_6Z__) || defined(__ARM_ARCH_6ZK__) \
|| defined (__ARM_ARCH_6K__) || defined(__ARM_ARCH_6T2__) \
|| defined (__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) \
|| defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) \
|| defined(__ARM_ARCH_7EM__)
/* excluding ARMv4/ARMv5 and lower (lacking ldrex/strex support) */
#undef DRM_DEV_MODE
#define DRM_DEV_MODE (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)
#define DRM_CAS(lock,old,new,__ret) \
do { \
__asm__ __volatile__ ( \
"1: ldrex %0, [%1]\n" \
" teq %0, %2\n" \
" ite eq\n" \
" strexeq %0, %3, [%1]\n" \
" movne %0, #1\n" \
: "=&r" (__ret) \
: "r" (lock), "r" (old), "r" (new) \
: "cc","memory"); \
} while (0)
#endif /* architecture */
#endif /* __GNUC__ >= 2 */