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40 lines
1.2 KiB
40 lines
1.2 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* PowerPC ELF notes. |
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* |
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* Copyright 2019, IBM Corporation |
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*/ |
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#include <linux/elfnote.h> |
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#include <asm/elfnote.h> |
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/* |
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* Ultravisor-capable bit (PowerNV only). |
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* |
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* Bit 0 indicates that the powerpc kernel binary knows how to run in an |
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* ultravisor-enabled system. |
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* |
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* In an ultravisor-enabled system, some machine resources are now controlled |
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* by the ultravisor. If the kernel is not ultravisor-capable, but it ends up |
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* being run on a machine with ultravisor, the kernel will probably crash |
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* trying to access ultravisor resources. For instance, it may crash in early |
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* boot trying to set the partition table entry 0. |
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* |
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* In an ultravisor-enabled system, a bootloader could warn the user or prevent |
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* the kernel from being run if the PowerPC ultravisor capability doesn't exist |
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* or the Ultravisor-capable bit is not set. |
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*/ |
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#ifdef CONFIG_PPC_POWERNV |
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#define PPCCAP_ULTRAVISOR_BIT (1 << 0) |
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#else |
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#define PPCCAP_ULTRAVISOR_BIT 0 |
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#endif |
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/* |
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* Add the PowerPC Capabilities in the binary ELF note. It is a bitmap that |
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* can be used to advertise kernel capabilities to userland. |
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*/ |
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#define PPC_CAPABILITIES_BITMAP (PPCCAP_ULTRAVISOR_BIT) |
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ELFNOTE(PowerPC, PPC_ELFNOTE_CAPABILITIES, |
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.long PPC_CAPABILITIES_BITMAP)
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