[PATCH 4/5] arm64: Add ESR.DFSC definition of unsupported exclusive or atomic access

[Yicong Yang]

From: Yicong Yang <yangyicong at hisilicon.com>

0x35 indicates IMPLEMENTATION DEFINED fault for Unsupported Exclusive or
Atomic access. Add ESR_ELx_FSC definition and corresponding wrapper.

Signed-off-by: Yicong Yang <yangyicong at hisilicon.com>
---
 arch/arm64/include/asm/esr.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm64/include/asm/esr.h b/arch/arm64/include/asm/esr.h
index 94c9d537a7ad..1639e99f2bd6 100644
--- a/arch/arm64/include/asm/esr.h
+++ b/arch/arm64/include/asm/esr.h
@@ -122,6 +122,7 @@
 #define ESR_ELx_FSC_SEA_TTW(n)	(0x14 + (n))
 #define ESR_ELx_FSC_SECC	(0x18)
 #define ESR_ELx_FSC_SECC_TTW(n)	(0x1c + (n))
+#define ESR_ELx_FSC_EXCL_ATOMIC	(0x35)
 
 /* Status codes for individual page table levels */
 #define ESR_ELx_FSC_ACCESS_L(n)	(ESR_ELx_FSC_ACCESS + (n))
@@ -470,6 +471,13 @@ static inline bool esr_fsc_is_access_flag_fault(unsigned long esr)
 	       (esr == ESR_ELx_FSC_ACCESS_L(0));
 }
 
+static inline bool esr_fsc_is_excl_atomic_fault(unsigned long esr)
+{
+	esr = esr & ESR_ELx_FSC;
+
+	return esr == ESR_ELx_FSC_EXCL_ATOMIC;
+}
+
 /* Indicate whether ESR.EC==0x1A is for an ERETAx instruction */
 static inline bool esr_iss_is_eretax(unsigned long esr)
 {
-- 
2.24.0