| /* 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) |
