mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 05:34:00 +08:00
483fad1c3f
Some IBM POWER-based platforms have the ability to run in a mode which mostly appears to the OS as a different processor from the actual hardware. For example, a Power6 system may appear to be a Power5+, which makes the AT_PLATFORM value "power5+". This means that programs are restricted to the ISA supported by Power5+; Power6-specific instructions are treated as illegal. However, some applications (virtual machines, optimized libraries) can benefit from knowledge of the underlying CPU model. A new aux vector entry, AT_BASE_PLATFORM, will denote the actual hardware. For example, on a Power6 system in Power5+ compatibility mode, AT_PLATFORM will be "power5+" and AT_BASE_PLATFORM will be "power6". The idea is that AT_PLATFORM indicates the instruction set supported, while AT_BASE_PLATFORM indicates the underlying microarchitecture. If the architecture has defined ELF_BASE_PLATFORM, copy that value to the user stack in the same manner as ELF_PLATFORM. Signed-off-by: Nathan Lynch <ntl@pobox.com> Acked-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
40 lines
1.4 KiB
C
40 lines
1.4 KiB
C
#ifndef _LINUX_AUXVEC_H
|
|
#define _LINUX_AUXVEC_H
|
|
|
|
#include <asm/auxvec.h>
|
|
|
|
/* Symbolic values for the entries in the auxiliary table
|
|
put on the initial stack */
|
|
#define AT_NULL 0 /* end of vector */
|
|
#define AT_IGNORE 1 /* entry should be ignored */
|
|
#define AT_EXECFD 2 /* file descriptor of program */
|
|
#define AT_PHDR 3 /* program headers for program */
|
|
#define AT_PHENT 4 /* size of program header entry */
|
|
#define AT_PHNUM 5 /* number of program headers */
|
|
#define AT_PAGESZ 6 /* system page size */
|
|
#define AT_BASE 7 /* base address of interpreter */
|
|
#define AT_FLAGS 8 /* flags */
|
|
#define AT_ENTRY 9 /* entry point of program */
|
|
#define AT_NOTELF 10 /* program is not ELF */
|
|
#define AT_UID 11 /* real uid */
|
|
#define AT_EUID 12 /* effective uid */
|
|
#define AT_GID 13 /* real gid */
|
|
#define AT_EGID 14 /* effective gid */
|
|
#define AT_PLATFORM 15 /* string identifying CPU for optimizations */
|
|
#define AT_HWCAP 16 /* arch dependent hints at CPU capabilities */
|
|
#define AT_CLKTCK 17 /* frequency at which times() increments */
|
|
|
|
#define AT_SECURE 23 /* secure mode boolean */
|
|
|
|
#define AT_BASE_PLATFORM 24 /* string identifying real platform, may
|
|
* differ from AT_PLATFORM. */
|
|
|
|
#define AT_EXECFN 31 /* filename of program */
|
|
|
|
#ifdef __KERNEL__
|
|
#define AT_VECTOR_SIZE_BASE 18 /* NEW_AUX_ENT entries in auxiliary table */
|
|
/* number of "#define AT_.*" above, minus {AT_NULL, AT_IGNORE, AT_NOTELF} */
|
|
#endif
|
|
|
|
#endif /* _LINUX_AUXVEC_H */
|