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-rw-r--r--arch/arm/include/asm/xen/events.h22
-rw-r--r--arch/arm/include/asm/xen/page.h4
2 files changed, 26 insertions, 0 deletions
diff --git a/arch/arm/include/asm/xen/events.h b/arch/arm/include/asm/xen/events.h
index 94b4e9020b02..5c27696de14f 100644
--- a/arch/arm/include/asm/xen/events.h
+++ b/arch/arm/include/asm/xen/events.h
@@ -15,4 +15,26 @@ static inline int xen_irqs_disabled(struct pt_regs *regs)
return raw_irqs_disabled_flags(regs->ARM_cpsr);
}
+/*
+ * We cannot use xchg because it does not support 8-byte
+ * values. However it is safe to use {ldr,dtd}exd directly because all
+ * platforms which Xen can run on support those instructions.
+ */
+static inline xen_ulong_t xchg_xen_ulong(xen_ulong_t *ptr, xen_ulong_t val)
+{
+ xen_ulong_t oldval;
+ unsigned int tmp;
+
+ wmb();
+ asm volatile("@ xchg_xen_ulong\n"
+ "1: ldrexd %0, %H0, [%3]\n"
+ " strexd %1, %2, %H2, [%3]\n"
+ " teq %1, #0\n"
+ " bne 1b"
+ : "=&r" (oldval), "=&r" (tmp)
+ : "r" (val), "r" (ptr)
+ : "memory", "cc");
+ return oldval;
+}
+
#endif /* _ASM_ARM_XEN_EVENTS_H */
diff --git a/arch/arm/include/asm/xen/page.h b/arch/arm/include/asm/xen/page.h
index c6b9096cef95..30cdacb675af 100644
--- a/arch/arm/include/asm/xen/page.h
+++ b/arch/arm/include/asm/xen/page.h
@@ -1,6 +1,7 @@
#ifndef _ASM_ARM_XEN_PAGE_H
#define _ASM_ARM_XEN_PAGE_H
+#include <asm/mach/map.h>
#include <asm/page.h>
#include <asm/pgtable.h>
@@ -86,4 +87,7 @@ static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
{
return __set_phys_to_machine(pfn, mfn);
}
+
+#define xen_remap(cookie, size) __arm_ioremap((cookie), (size), MT_MEMORY);
+
#endif /* _ASM_ARM_XEN_PAGE_H */