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- ==========================
- ELF Note PowerPC Namespace
- ==========================
- The PowerPC namespace in an ELF Note of the kernel binary is used to store
- capabilities and information which can be used by a bootloader or userland.
- Types and Descriptors
- ---------------------
- The types to be used with the "PowerPC" namespace are defined in [#f1]_.
- 1) PPC_ELFNOTE_CAPABILITIES
- Define the capabilities supported/required by the kernel. This type uses a
- bitmap as "descriptor" field. Each bit is described below:
- - Ultravisor-capable bit (PowerNV only).
- .. code-block:: c
- #define PPCCAP_ULTRAVISOR_BIT (1 << 0)
- Indicate 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.
- References
- ----------
- .. [#f1] arch/powerpc/include/asm/elfnote.h
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