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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1234567891011121314151617181920212223242526272829303132333435363738394041/* 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)