powerpc: Add PowerPC Capabilities ELF note (70ed86f4) · Commits · 戴 / test

arch/powerpc/include/asm/elfnote.h

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		/* 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__ */

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		@@ -53,7 +53,7 @@ obj-y := cputable.o ptrace.o syscalls.o \
		dma-common.o
		obj-$(CONFIG_PPC64) += setup_64.o sys_ppc32.o \
		signal_64.o ptrace32.o \
		paca.o nvram_64.o firmware.o
		paca.o nvram_64.o firmware.o note.o
		obj-$(CONFIG_VDSO32) += vdso32/
		obj-$(CONFIG_PPC_WATCHDOG) += watchdog.o
		obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o

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		/* SPDX-License-Identifier: GPL-2.0 */
		/*
		* PowerPC ELF notes.
		*
		* Copyright 2019, IBM Corporation
		*/

		#include <linux/elfnote.h>
		#include <asm/elfnote.h>

		/*
		* Ultravisor-capable bit (PowerNV only).
		*
		* Bit 0 indicates that the powerpc kernel binary knows how to run in an
		* ultravisor-enabled system.
		*
		* In an ultravisor-enabled system, some machine resources are now controlled
		* by the ultravisor. If the kernel is not ultravisor-capable, but it ends up
		* being run on a machine with ultravisor, the kernel will probably crash
		* trying to access ultravisor resources. For instance, it may crash in early
		* boot trying to set the partition table entry 0.
		*
		* In an ultravisor-enabled system, a bootloader could warn the user or prevent
		* the kernel from being run if the PowerPC ultravisor capability doesn't exist
		* or the Ultravisor-capable bit is not set.
		*/
		#ifdef CONFIG_PPC_POWERNV
		#define PPCCAP_ULTRAVISOR_BIT (1 << 0)
		#else
		#define PPCCAP_ULTRAVISOR_BIT 0
		#endif

		/*
		* Add the PowerPC Capabilities in the binary ELF note. It is a bitmap that
		* can be used to advertise kernel capabilities to userland.
		*/
		#define PPC_CAPABILITIES_BITMAP (PPCCAP_ULTRAVISOR_BIT)

		ELFNOTE(PowerPC, PPC_ELFNOTE_CAPABILITIES,
		.long PPC_CAPABILITIES_BITMAP)