/* SPDX-License-Identifier: MIT */
/******************************************************************************
* elfnote . h
*
* Definitions used for the Xen ELF notes .
*
* Copyright ( c ) 2006 , Ian Campbell , XenSource Ltd .
*/
#ifndef __XEN_PUBLIC_ELFNOTE_H__
#define __XEN_PUBLIC_ELFNOTE_H__
/*
* ` incontents 200 elfnotes ELF notes
*
* The notes should live in a PT_NOTE segment and have " Xen " in the
* name field .
*
* Numeric types are either 4 or 8 bytes depending on the content of
* the desc field .
*
* LEGACY indicated the fields in the legacy _ _ xen_guest string which
* this a note type replaces .
*
* String values ( for non - legacy ) are NULL terminated ASCII , also known
* as ASCIZ type .
*
* Xen only uses ELF Notes contained in x86 binaries .
*/
/*
* NAME = VALUE pair ( string ) .
*/
#define XEN_ELFNOTE_INFO 0
/*
* The virtual address of the entry point ( numeric ) .
*
* LEGACY : VIRT_ENTRY
*/
#define XEN_ELFNOTE_ENTRY 1
/* The virtual address of the hypercall transfer page (numeric).
*
* LEGACY : HYPERCALL_PAGE . ( n . b . legacy value is a physical page
* number not a virtual address )
*/
#define XEN_ELFNOTE_HYPERCALL_PAGE 2
/* The virtual address where the kernel image should be mapped (numeric).
*
* Defaults to 0 .
*
* LEGACY : VIRT_BASE
*/
#define XEN_ELFNOTE_VIRT_BASE 3
/*
* The offset of the ELF paddr field from the actual required
* pseudo - physical address ( numeric ) .
*
* This is used to maintain backwards compatibility with older kernels
* which wrote _ _ PAGE_OFFSET into that field . This field defaults to 0
* if not present .
*
* LEGACY : ELF_PADDR_OFFSET . ( n . b . legacy default is VIRT_BASE )
*/
#define XEN_ELFNOTE_PADDR_OFFSET 4
/*
* The version of Xen that we work with ( string ) .
*
* LEGACY : XEN_VER
*/
#define XEN_ELFNOTE_XEN_VERSION 5
/*
* The name of the guest operating system ( string ) .
*
* LEGACY : GUEST_OS
*/
#define XEN_ELFNOTE_GUEST_OS 6
/*
* The version of the guest operating system ( string ) .
*
* LEGACY : GUEST_VER
*/
#define XEN_ELFNOTE_GUEST_VERSION 7
/*
* The loader type ( string ) .
*
* LEGACY : LOADER
*/
#define XEN_ELFNOTE_LOADER 8
/*
* The kernel supports PAE ( x86 / 32 only , string = " yes " , " no " or
* " bimodal " ) .
*
* For compatibility with Xen 3 . 0 . 3 and earlier the " bimodal " setting
* may be given as " yes , bimodal " which will cause older Xen to treat
* this kernel as PAE .
*
* LEGACY : PAE ( n . b . The legacy interface included a provision to
* indicate ' extended - cr3 ' support allowing L3 page tables to be
* placed above 4 G . It is assumed that any kernel new enough to use
* these ELF notes will include this and therefore " yes " here is
* equivalent to " yes [ entended - cr3 ] " in the _ _ xen_guest interface .
*/
#define XEN_ELFNOTE_PAE_MODE 9
/*
* The features supported / required by this kernel ( string ) .
*
* The string must consist of a list of feature names ( as given in
* features . h , without the " XENFEAT_ " prefix ) separated by ' | '
* characters . If a feature is required for the kernel to function
* then the feature name must be preceded by a ' ! ' character .
*
* LEGACY : FEATURES
*/
#define XEN_ELFNOTE_FEATURES 10
/*
* The kernel requires the symbol table to be loaded ( string = " yes " or " no " )
* LEGACY : BSD_SYMTAB ( n . b . The legacy treated the presence or absence
* of this string as a boolean flag rather than requiring " yes " or
* " no " .
*/
#define XEN_ELFNOTE_BSD_SYMTAB 11
/*
* The lowest address the hypervisor hole can begin at ( numeric ) .
*
* This must not be set higher than HYPERVISOR_VIRT_START . Its presence
* also indicates to the hypervisor that the kernel can deal with the
* hole starting at a higher address .
*/
#define XEN_ELFNOTE_HV_START_LOW 12
/*
* List of maddr_t - sized mask / value pairs describing how to recognize
* ( non - present ) L1 page table entries carrying valid MFNs ( numeric ) .
*/
#define XEN_ELFNOTE_L1_MFN_VALID 13
/*
* Whether or not the guest supports cooperative suspend cancellation .
* This is a numeric value .
*
* Default is 0
*/
#define XEN_ELFNOTE_SUSPEND_CANCEL 14
/*
* The ( non - default ) location the initial phys - to - machine map should be
* placed at by the hypervisor ( Dom0 ) or the tools ( DomU ) .
* The kernel must be prepared for this mapping to be established using
* large pages , despite such otherwise not being available to guests . Note
* that these large pages may be misaligned in PFN space ( they ' ll obviously
* be aligned in MFN and virtual address spaces ) .
* The kernel must also be able to handle the page table pages used for
* this mapping not being accessible through the initial mapping .
* ( Only x86 - 64 supports this at present . )
*/
#define XEN_ELFNOTE_INIT_P2M 15
/*
* Whether or not the guest can deal with being passed an initrd not
* mapped through its initial page tables .
*/
#define XEN_ELFNOTE_MOD_START_PFN 16
/*
* The features supported by this kernel ( numeric ) .
*
* Other than XEN_ELFNOTE_FEATURES on pre - 4 . 2 Xen , this note allows a
* kernel to specify support for features that older hypervisors don ' t
* know about . The set of features 4 . 2 and newer hypervisors will
* consider supported by the kernel is the combination of the sets
* specified through this and the string note .
*
* LEGACY : FEATURES
*/
#define XEN_ELFNOTE_SUPPORTED_FEATURES 17
/*
* Physical entry point into the kernel .
*
* 32 bit entry point into the kernel . When requested to launch the
* guest kernel in a HVM container , Xen will use this entry point to
* launch the guest in 32 bit protected mode with paging disabled .
* Ignored otherwise .
*/
#define XEN_ELFNOTE_PHYS32_ENTRY 18
/*
* Physical loading constraints for PVH kernels
*
* The presence of this note indicates the kernel supports relocating itself .
*
* The note may include up to three 32 bit values to place constraints on the
* guest physical loading addresses and alignment for a PVH kernel . Values
* are read in the following order :
* - a required start alignment ( default 0 x200000 )
* - a minimum address for the start of the image ( default 0 ; see below )
* - a maximum address for the last byte of the image ( default 0 xffffffff )
*
* When this note specifies an alignment value , it is used . Otherwise the
* maximum p_align value from loadable ELF Program Headers is used , if it is
* greater than or equal to 4 k ( 0 x1000 ) . Otherwise , the default is used .
*/
#define XEN_ELFNOTE_PHYS32_RELOC 19
/*
* The number of the highest elfnote defined .
*/
#define XEN_ELFNOTE_MAX XEN_ELFNOTE_PHYS32_RELOC
/*
* System information exported through crash notes .
*
* The kexec / kdump code will create one XEN_ELFNOTE_CRASH_INFO
* note in case of a system crash . This note will contain various
* information about the system , see xen / include / xen / elfcore . h .
*/
#define XEN_ELFNOTE_CRASH_INFO 0 x1000001
/*
* System registers exported through crash notes .
*
* The kexec / kdump code will create one XEN_ELFNOTE_CRASH_REGS
* note per cpu in case of a system crash . This note is architecture
* specific and will contain registers not saved in the " CORE " note .
* See xen / include / xen / elfcore . h for more information .
*/
#define XEN_ELFNOTE_CRASH_REGS 0 x1000002
/*
* xen dump - core none note .
* xm dump - core code will create one XEN_ELFNOTE_DUMPCORE_NONE
* in its dump file to indicate that the file is xen dump - core
* file . This note doesn ' t have any other information .
* See tools / libxc / xc_core . h for more information .
*/
#define XEN_ELFNOTE_DUMPCORE_NONE 0 x2000000
/*
* xen dump - core header note .
* xm dump - core code will create one XEN_ELFNOTE_DUMPCORE_HEADER
* in its dump file .
* See tools / libxc / xc_core . h for more information .
*/
#define XEN_ELFNOTE_DUMPCORE_HEADER 0 x2000001
/*
* xen dump - core xen version note .
* xm dump - core code will create one XEN_ELFNOTE_DUMPCORE_XEN_VERSION
* in its dump file . It contains the xen version obtained via the
* XENVER hypercall .
* See tools / libxc / xc_core . h for more information .
*/
#define XEN_ELFNOTE_DUMPCORE_XEN_VERSION 0 x2000002
/*
* xen dump - core format version note .
* xm dump - core code will create one XEN_ELFNOTE_DUMPCORE_FORMAT_VERSION
* in its dump file . It contains a format version identifier .
* See tools / libxc / xc_core . h for more information .
*/
#define XEN_ELFNOTE_DUMPCORE_FORMAT_VERSION 0 x2000003
#endif /* __XEN_PUBLIC_ELFNOTE_H__ */
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