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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)
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