]> git.baikalelectronics.ru Git - kernel.git/commit
MIPS: AT_HWCAP aux vector infrastructure
authorPaul Burton <paul.burton@imgtec.com>
Mon, 27 Jul 2015 19:58:23 +0000 (12:58 -0700)
committerRalf Baechle <ralf@linux-mips.org>
Thu, 3 Sep 2015 10:07:59 +0000 (12:07 +0200)
commit045092ed534aff3c6fd7047a3157af687236c349
tree42c39860145a108787727893e220c98813290aa0
parent61a4dba00ec6b21656d7fe1df1eb1b3e74031feb
MIPS: AT_HWCAP aux vector infrastructure

In order for userland to determine whether various features are safe to
use, it will need to know both that the hardware supports those features
and that the kernel is recent enough & configured appropriately to
support them. For example under the O32 modeless FP proposal the dynamic
linker & ifunc resolvers will need this information.  The kernel is the
only thing in a position to know availability accurately, so the kernel
needs to provide the information to userland. This patch introduces the
infrastructure to provide the AT_HWCAP aux vector to userland in order
to provide that information. It also defines the 2 currently specified
flags, which indicate MIPSr6 & MSA support.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Matthew Fortune <matthew.fortune@imgtec.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: Maciej W. Rozycki <macro@linux-mips.org>
Cc: Alex Smith <alex@alex-smith.me.uk>
Cc: linux-kernel@vger.kernel.org
Cc: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
Cc: Markos Chandras <markos.chandras@imgtec.com>
Cc: Ingo Molnar <mingo@kernel.org>
Patchwork: https://patchwork.linux-mips.org/patch/10797/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
arch/mips/include/asm/elf.h
arch/mips/include/uapi/asm/hwcap.h [new file with mode: 0644]
arch/mips/kernel/cpu-probe.c