| /* 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) |