s390: add assembler macros for CPU alternatives

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[ Upstream commit fba9eb7946 ]

Add a header with macros usable in assembler files to emit alternative
code sequences. It works analog to the alternatives for inline assmeblies
in C files, with the same restrictions and capabilities.
The syntax is

     ALTERNATIVE "<default instructions sequence>", \
		 "<alternative instructions sequence>", \
		 "<features-bit>"
and

     ALTERNATIVE_2 "<default instructions sequence>", \
		   "<alternative instructions sqeuence #1>", \
		   "<feature-bit #1>",
		   "<alternative instructions sqeuence #2>", \
		   "<feature-bit #2>"

Reviewed-by: Vasily Gorbik <gor@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Martin Schwidefsky 2018-05-23 18:22:01 +02:00 • committed by Greg Kroah-Hartman

parent 131ff238b8

commit 9a38169fb6

1 changed files with 108 additions and 0 deletions

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arch/s390/include/asm/alternative-asm.h

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