From: Wei Chen <Wei.Chen@arm.com>
Date: Wed, 5 Apr 2017 09:09:17 +0000 (+0800)
Subject: xen/arm: Introduce a helper to check local abort is enabled
X-Git-Tag: archive/raspbian/4.11.1-1+rpi1~1^2~66^2~2335
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=1656edde42d556d2457fb5a452c8e81a01328c0b;p=xen.git

xen/arm: Introduce a helper to check local abort is enabled

In previous patch, we have umasked the Abort/SError bit for Xen
in most of its running time. So in some use-cases, we have to
check whether the abort is enabled in current context. For example,
while we want to synchronize SErrors, we have to confirm the abort
is enabled. Otherwise synchronize SErrors is pointless.

Signed-off-by: Wei Chen <Wei.Chen@arm.com>
Reviewed-by: Julien Grall <julien.grall@arm.com>
---

diff --git a/xen/include/asm-arm/system.h b/xen/include/asm-arm/system.h
index 2eb96e8769..b94e56fe26 100644
--- a/xen/include/asm-arm/system.h
+++ b/xen/include/asm-arm/system.h
@@ -51,6 +51,13 @@
 # error "unknown ARM variant"
 #endif
 
+static inline int local_abort_is_enabled(void)
+{
+    unsigned long flags;
+    local_save_flags(flags);
+    return !(flags & PSR_ABT_MASK);
+}
+
 #define arch_fetch_and_add(x, v) __sync_fetch_and_add(x, v)
 
 extern struct vcpu *__context_switch(struct vcpu *prev, struct vcpu *next);