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powerpc: Add PowerPC Capabilities ELF note

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Add the PowerPC name and the PPC_ELFNOTE_CAPABILITIES type in the
kernel binary ELF note. This type is a bitmap that can be used to
advertise kernel capabilities to userland.

This patch also defines PPCCAP_ULTRAVISOR_BIT as being the bit zero.

Suggested-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Claudio Carvalho <cclaudio@linux.ibm.com>
[ maxiwell: Define the 'PowerPC' type in the elfnote.h ]
Signed-off-by: Maxiwell S. Garcia <maxiwell@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190829155021.2915-2-maxiwell@linux.ibm.com
This commit is contained in:
Claudio Carvalho
2019-08-29 12:50:20 -03:00
committed by Michael Ellerman
parent a102f139aa
commit 70ed86f4de
3 changed files with 65 additions and 1 deletions
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24
arch/powerpc/include/asm/elfnote.h Normal file
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@@ -0,0 +1,24 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* PowerPC ELF notes.
*
* Copyright 2019, IBM Corporation
*/
#ifndef __ASM_POWERPC_ELFNOTE_H__
#define __ASM_POWERPC_ELFNOTE_H__
/*
* These note types should live in a SHT_NOTE segment and have
* "PowerPC" in the name field.
*/
/*
* The capabilities supported/required by this kernel (bitmap).
*
* This type uses a bitmap as "desc" field. Each bit is described
* in arch/powerpc/kernel/note.S
*/
#define PPC_ELFNOTE_CAPABILITIES 1
#endif /* __ASM_POWERPC_ELFNOTE_H__ */