Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / sh / include / asm / futex.h

diff --git a/kernel/arch/sh/include/asm/futex.h b/kernel/arch/sh/include/asm/futex.h
new file mode 100644 (file)
index 0000000..7be39a6
--- /dev/null
+++ b/kernel/arch/sh/include/asm/futex.h
@@ -0,0 +1,78 @@
+#ifndef __ASM_SH_FUTEX_H
+#define __ASM_SH_FUTEX_H
+
+#ifdef __KERNEL__
+
+#include <linux/futex.h>
+#include <linux/uaccess.h>
+#include <asm/errno.h>
+
+/* XXX: UP variants, fix for SH-4A and SMP.. */
+#include <asm/futex-irq.h>
+
+static inline int futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr)
+{
+       int op = (encoded_op >> 28) & 7;
+       int cmp = (encoded_op >> 24) & 15;
+       int oparg = (encoded_op << 8) >> 20;
+       int cmparg = (encoded_op << 20) >> 20;
+       int oldval = 0, ret;
+
+       if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
+               oparg = 1 << oparg;
+
+       if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
+               return -EFAULT;
+
+       pagefault_disable();
+
+       switch (op) {
+       case FUTEX_OP_SET:
+               ret = atomic_futex_op_xchg_set(oparg, uaddr, &oldval);
+               break;
+       case FUTEX_OP_ADD:
+               ret = atomic_futex_op_xchg_add(oparg, uaddr, &oldval);
+               break;
+       case FUTEX_OP_OR:
+               ret = atomic_futex_op_xchg_or(oparg, uaddr, &oldval);
+               break;
+       case FUTEX_OP_ANDN:
+               ret = atomic_futex_op_xchg_and(~oparg, uaddr, &oldval);
+               break;
+       case FUTEX_OP_XOR:
+               ret = atomic_futex_op_xchg_xor(oparg, uaddr, &oldval);
+               break;
+       default:
+               ret = -ENOSYS;
+               break;
+       }
+
+       pagefault_enable();
+
+       if (!ret) {
+               switch (cmp) {
+               case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
+               case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
+               case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
+               case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
+               case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
+               case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
+               default: ret = -ENOSYS;
+               }
+       }
+
+       return ret;
+}
+
+static inline int
+futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
+                             u32 oldval, u32 newval)
+{
+       if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
+               return -EFAULT;
+
+       return atomic_futex_op_cmpxchg_inatomic(uval, uaddr, oldval, newval);
+}
+
+#endif /* __KERNEL__ */
+#endif /* __ASM_SH_FUTEX_H */