diff options
Diffstat (limited to 'Documentation/powerpc/elfnote.rst')
| -rw-r--r-- | Documentation/powerpc/elfnote.rst | 41 |
1 files changed, 0 insertions, 41 deletions
diff --git a/Documentation/powerpc/elfnote.rst b/Documentation/powerpc/elfnote.rst deleted file mode 100644 index 06602248621c..000000000000 --- a/Documentation/powerpc/elfnote.rst +++ /dev/null @@ -1,41 +0,0 @@ -========================== -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" namesapce 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 - |