ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/arch/xtensa/include/asm/futex.h b/marvell/linux/arch/xtensa/include/asm/futex.h
new file mode 100644
index 0000000..0c4457c
--- /dev/null
+++ b/marvell/linux/arch/xtensa/include/asm/futex.h
@@ -0,0 +1,164 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Atomic futex routines
+ *
+ * Based on the PowerPC implementataion
+ *
+ * Copyright (C) 2013 TangoTec Ltd.
+ *
+ * Baruch Siach <baruch@tkos.co.il>
+ */
+
+#ifndef _ASM_XTENSA_FUTEX_H
+#define _ASM_XTENSA_FUTEX_H
+
+#include <linux/futex.h>
+#include <linux/uaccess.h>
+#include <linux/errno.h>
+
+#if XCHAL_HAVE_EXCLUSIVE
+#define __futex_atomic_op(insn, ret, old, uaddr, arg) \
+ __asm__ __volatile( \
+ "1: l32ex %[oldval], %[addr]\n" \
+ insn "\n" \
+ "2: s32ex %[newval], %[addr]\n" \
+ " getex %[newval]\n" \
+ " beqz %[newval], 1b\n" \
+ " movi %[newval], 0\n" \
+ "3:\n" \
+ " .section .fixup,\"ax\"\n" \
+ " .align 4\n" \
+ " .literal_position\n" \
+ "5: movi %[oldval], 3b\n" \
+ " movi %[newval], %[fault]\n" \
+ " jx %[oldval]\n" \
+ " .previous\n" \
+ " .section __ex_table,\"a\"\n" \
+ " .long 1b, 5b, 2b, 5b\n" \
+ " .previous\n" \
+ : [oldval] "=&r" (old), [newval] "=&r" (ret) \
+ : [addr] "r" (uaddr), [oparg] "r" (arg), \
+ [fault] "I" (-EFAULT) \
+ : "memory")
+#elif XCHAL_HAVE_S32C1I
+#define __futex_atomic_op(insn, ret, old, uaddr, arg) \
+ __asm__ __volatile( \
+ "1: l32i %[oldval], %[addr], 0\n" \
+ insn "\n" \
+ " wsr %[oldval], scompare1\n" \
+ "2: s32c1i %[newval], %[addr], 0\n" \
+ " bne %[newval], %[oldval], 1b\n" \
+ " movi %[newval], 0\n" \
+ "3:\n" \
+ " .section .fixup,\"ax\"\n" \
+ " .align 4\n" \
+ " .literal_position\n" \
+ "5: movi %[oldval], 3b\n" \
+ " movi %[newval], %[fault]\n" \
+ " jx %[oldval]\n" \
+ " .previous\n" \
+ " .section __ex_table,\"a\"\n" \
+ " .long 1b, 5b, 2b, 5b\n" \
+ " .previous\n" \
+ : [oldval] "=&r" (old), [newval] "=&r" (ret) \
+ : [addr] "r" (uaddr), [oparg] "r" (arg), \
+ [fault] "I" (-EFAULT) \
+ : "memory")
+#endif
+
+static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
+ u32 __user *uaddr)
+{
+#if XCHAL_HAVE_S32C1I || XCHAL_HAVE_EXCLUSIVE
+ int oldval = 0, ret;
+
+ pagefault_disable();
+
+ switch (op) {
+ case FUTEX_OP_SET:
+ __futex_atomic_op("mov %[newval], %[oparg]",
+ ret, oldval, uaddr, oparg);
+ break;
+ case FUTEX_OP_ADD:
+ __futex_atomic_op("add %[newval], %[oldval], %[oparg]",
+ ret, oldval, uaddr, oparg);
+ break;
+ case FUTEX_OP_OR:
+ __futex_atomic_op("or %[newval], %[oldval], %[oparg]",
+ ret, oldval, uaddr, oparg);
+ break;
+ case FUTEX_OP_ANDN:
+ __futex_atomic_op("and %[newval], %[oldval], %[oparg]",
+ ret, oldval, uaddr, ~oparg);
+ break;
+ case FUTEX_OP_XOR:
+ __futex_atomic_op("xor %[newval], %[oldval], %[oparg]",
+ ret, oldval, uaddr, oparg);
+ break;
+ default:
+ ret = -ENOSYS;
+ }
+
+ pagefault_enable();
+
+ if (!ret)
+ *oval = oldval;
+
+ return ret;
+#else
+ return -ENOSYS;
+#endif
+}
+
+static inline int
+futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
+ u32 oldval, u32 newval)
+{
+#if XCHAL_HAVE_S32C1I || XCHAL_HAVE_EXCLUSIVE
+ unsigned long tmp;
+ int ret = 0;
+
+ if (!access_ok(uaddr, sizeof(u32)))
+ return -EFAULT;
+
+ __asm__ __volatile__ (
+ " # futex_atomic_cmpxchg_inatomic\n"
+#if XCHAL_HAVE_EXCLUSIVE
+ "1: l32ex %[tmp], %[addr]\n"
+ " s32i %[tmp], %[uval], 0\n"
+ " bne %[tmp], %[oldval], 2f\n"
+ " mov %[tmp], %[newval]\n"
+ "3: s32ex %[tmp], %[addr]\n"
+ " getex %[tmp]\n"
+ " beqz %[tmp], 1b\n"
+#elif XCHAL_HAVE_S32C1I
+ " wsr %[oldval], scompare1\n"
+ "1: s32c1i %[newval], %[addr], 0\n"
+ " s32i %[newval], %[uval], 0\n"
+#endif
+ "2:\n"
+ " .section .fixup,\"ax\"\n"
+ " .align 4\n"
+ " .literal_position\n"
+ "4: movi %[tmp], 2b\n"
+ " movi %[ret], %[fault]\n"
+ " jx %[tmp]\n"
+ " .previous\n"
+ " .section __ex_table,\"a\"\n"
+ " .long 1b, 4b\n"
+#if XCHAL_HAVE_EXCLUSIVE
+ " .long 3b, 4b\n"
+#endif
+ " .previous\n"
+ : [ret] "+r" (ret), [newval] "+r" (newval), [tmp] "=&r" (tmp)
+ : [addr] "r" (uaddr), [oldval] "r" (oldval), [uval] "r" (uval),
+ [fault] "I" (-EFAULT)
+ : "memory");
+
+ return ret;
+#else
+ return -ENOSYS;
+#endif
+}
+
+#endif /* _ASM_XTENSA_FUTEX_H */