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authorPaul Burton <paul.burton@imgtec.com>2015-07-27 12:58:23 -0700
committerRalf Baechle <ralf@linux-mips.org>2015-09-03 12:07:59 +0200
commite14f1db7a61f016d74393ca9e8fc49a91d27f603 (patch)
tree42c39860145a108787727893e220c98813290aa0 /arch/mips/kernel
parentbf82cb30c7e58b3a9742f0a45962ebdf51befac7 (diff)
downloadop-kernel-dev-e14f1db7a61f016d74393ca9e8fc49a91d27f603.zip
op-kernel-dev-e14f1db7a61f016d74393ca9e8fc49a91d27f603.tar.gz
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>
Diffstat (limited to 'arch/mips/kernel')
-rw-r--r--arch/mips/kernel/cpu-probe.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index 9870367..b6c1fee 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -32,6 +32,9 @@
#include <asm/spram.h>
#include <asm/uaccess.h>
+/* Hardware capabilities */
+unsigned int elf_hwcap __read_mostly;
+
/*
* Get the FPU Implementation/Revision.
*/
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