1 files changed, 88 insertions, 0 deletions
diff --git a/arch/arm/include/asm/xen/system.h b/arch/arm/include/asm/xen/system.h
new file mode 100644
index 0000000000..0fc8a7995c
--- /dev/null
+++ b/arch/arm/include/asm/xen/system.h
@@ -0,0 +1,88 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * (C) 2014 Karim Allah Ahmed <karim.allah.ahmed@gmail.com>
+ * (C) 2020, EPAM Systems Inc.
+ */
+#ifndef _ASM_ARM_XEN_SYSTEM_H
+#define _ASM_ARM_XEN_SYSTEM_H
+
+#include <compiler.h>
+#include <asm/bitops.h>
+
+/* If *ptr == old, then store new there (and return new).
+ * Otherwise, return the old value.
+ * Atomic.
+ */
+#define synch_cmpxchg(ptr, old, new) \
+({ __typeof__(*ptr) stored = old; \
+	__atomic_compare_exchange_n(ptr, &stored, new, 0, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST) ? new : old; \
+})
+
+/* As test_and_clear_bit, but using __ATOMIC_SEQ_CST */
+static inline int synch_test_and_clear_bit(int nr, volatile void *addr)
+{
+	u8 *byte = ((u8 *)addr) + (nr >> 3);
+	u8 bit = 1 << (nr & 7);
+	u8 orig;
+
+	orig = __atomic_fetch_and(byte, ~bit, __ATOMIC_SEQ_CST);
+
+	return (orig & bit) != 0;
+}
+
+/* As test_and_set_bit, but using __ATOMIC_SEQ_CST */
+static inline int synch_test_and_set_bit(int nr, volatile void *base)
+{
+	u8 *byte = ((u8 *)base) + (nr >> 3);
+	u8 bit = 1 << (nr & 7);
+	u8 orig;
+
+	orig = __atomic_fetch_or(byte, bit, __ATOMIC_SEQ_CST);
+
+	return (orig & bit) != 0;
+}
+
+/* As set_bit, but using __ATOMIC_SEQ_CST */
+static inline void synch_set_bit(int nr, volatile void *addr)
+{
+	synch_test_and_set_bit(nr, addr);
+}
+
+/* As clear_bit, but using __ATOMIC_SEQ_CST */
+static inline void synch_clear_bit(int nr, volatile void *addr)
+{
+	synch_test_and_clear_bit(nr, addr);
+}
+
+/* As test_bit, but with a following memory barrier. */
+//static inline int synch_test_bit(int nr, volatile void *addr)
+static inline int synch_test_bit(int nr, const void *addr)
+{
+	int result;
+
+	result = test_bit(nr, addr);
+	barrier();
+	return result;
+}
+
+#define xchg(ptr, v)	__atomic_exchange_n(ptr, v, __ATOMIC_SEQ_CST)
+#define xchg(ptr, v)	__atomic_exchange_n(ptr, v, __ATOMIC_SEQ_CST)
+
+#define xen_mb()	mb()
+#define xen_rmb()	rmb()
+#define xen_wmb()	wmb()
+
+#define to_phys(x)		((unsigned long)(x))
+#define to_virt(x)		((void *)(x))
+
+#define PFN_UP(x)		(unsigned long)(((x) + PAGE_SIZE - 1) >> PAGE_SHIFT)
+#define PFN_DOWN(x)		(unsigned long)((x) >> PAGE_SHIFT)
+#define PFN_PHYS(x)		((unsigned long)(x) << PAGE_SHIFT)
+#define PHYS_PFN(x)		(unsigned long)((x) >> PAGE_SHIFT)
+
+#define virt_to_pfn(_virt)	(PFN_DOWN(to_phys(_virt)))
+#define virt_to_mfn(_virt)	(PFN_DOWN(to_phys(_virt)))
+#define mfn_to_virt(_mfn)	(to_virt(PFN_PHYS(_mfn)))
+#define pfn_to_virt(_pfn)	(to_virt(PFN_PHYS(_pfn)))
+
+#endif