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-===================
-Legacy instructions
-===================
-
-The arm64 port of the Linux kernel provides infrastructure to support
-emulation of instructions which have been deprecated, or obsoleted in
-the architecture. The infrastructure code uses undefined instruction
-hooks to support emulation. Where available it also allows turning on
-the instruction execution in hardware.
-
-The emulation mode can be controlled by writing to sysctl nodes
-(/proc/sys/abi). The following explains the different execution
-behaviours and the corresponding values of the sysctl nodes -
-
-* Undef
-    Value: 0
-
-  Generates undefined instruction abort. Default for instructions that
-  have been obsoleted in the architecture, e.g., SWP
-
-* Emulate
-    Value: 1
-
-  Uses software emulation. To aid migration of software, in this mode
-  usage of emulated instruction is traced as well as rate limited
-  warnings are issued. This is the default for deprecated
-  instructions, .e.g., CP15 barriers
-
-* Hardware Execution
-    Value: 2
-
-  Although marked as deprecated, some implementations may support the
-  enabling/disabling of hardware support for the execution of these
-  instructions. Using hardware execution generally provides better
-  performance, but at the loss of ability to gather runtime statistics
-  about the use of the deprecated instructions.
-
-The default mode depends on the status of the instruction in the
-architecture. Deprecated instructions should default to emulation
-while obsolete instructions must be undefined by default.
-
-Note: Instruction emulation may not be possible in all cases. See
-individual instruction notes for further information.
-
-Supported legacy instructions
------------------------------
-* SWP{B}
-
-:Node: /proc/sys/abi/swp
-:Status: Obsolete
-:Default: Undef (0)
-
-* CP15 Barriers
-
-:Node: /proc/sys/abi/cp15_barrier
-:Status: Deprecated
-:Default: Emulate (1)
-
-* SETEND
-
-:Node: /proc/sys/abi/setend
-:Status: Deprecated
-:Default: Emulate (1)*
-
-  Note: All the cpus on the system must have mixed endian support at EL0
-  for this feature to be enabled. If a new CPU - which doesn't support mixed
-  endian - is hotplugged in after this feature has been enabled, there could
-  be unexpected results in the application.