mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-31 08:14:06 +00:00
90f72aa58b
Add a flag for mmap that will be used to request a huge page region that will look like anonymous memory to user space. This is accomplished by using a file on the internal vfsmount. MAP_HUGETLB is a modifier of MAP_ANONYMOUS and so must be specified with it. The region will behave the same as a MAP_ANONYMOUS region using small pages. The patch also adds the MAP_STACK flag, which was previously defined only on some architectures but not on others. Since MAP_STACK is meant to be a hint only, architectures can define it without assigning a specific meaning to it. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Eric B Munson <ebmunson@us.ibm.com> Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk> Cc: David Rientjes <rientjes@google.com> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
60 lines
2.5 KiB
C
60 lines
2.5 KiB
C
#ifndef __ALPHA_MMAN_H__
|
|
#define __ALPHA_MMAN_H__
|
|
|
|
#define PROT_READ 0x1 /* page can be read */
|
|
#define PROT_WRITE 0x2 /* page can be written */
|
|
#define PROT_EXEC 0x4 /* page can be executed */
|
|
#define PROT_SEM 0x8 /* page may be used for atomic ops */
|
|
#define PROT_NONE 0x0 /* page can not be accessed */
|
|
#define PROT_GROWSDOWN 0x01000000 /* mprotect flag: extend change to start of growsdown vma */
|
|
#define PROT_GROWSUP 0x02000000 /* mprotect flag: extend change to end of growsup vma */
|
|
|
|
#define MAP_SHARED 0x01 /* Share changes */
|
|
#define MAP_PRIVATE 0x02 /* Changes are private */
|
|
#define MAP_TYPE 0x0f /* Mask for type of mapping (OSF/1 is _wrong_) */
|
|
#define MAP_FIXED 0x100 /* Interpret addr exactly */
|
|
#define MAP_ANONYMOUS 0x10 /* don't use a file */
|
|
|
|
/* not used by linux, but here to make sure we don't clash with OSF/1 defines */
|
|
#define _MAP_HASSEMAPHORE 0x0200
|
|
#define _MAP_INHERIT 0x0400
|
|
#define _MAP_UNALIGNED 0x0800
|
|
|
|
/* These are linux-specific */
|
|
#define MAP_GROWSDOWN 0x01000 /* stack-like segment */
|
|
#define MAP_DENYWRITE 0x02000 /* ETXTBSY */
|
|
#define MAP_EXECUTABLE 0x04000 /* mark it as an executable */
|
|
#define MAP_LOCKED 0x08000 /* lock the mapping */
|
|
#define MAP_NORESERVE 0x10000 /* don't check for reservations */
|
|
#define MAP_POPULATE 0x20000 /* populate (prefault) pagetables */
|
|
#define MAP_NONBLOCK 0x40000 /* do not block on IO */
|
|
#define MAP_STACK 0x80000 /* give out an address that is best suited for process/thread stacks */
|
|
#define MAP_HUGETLB 0x100000 /* create a huge page mapping */
|
|
|
|
#define MS_ASYNC 1 /* sync memory asynchronously */
|
|
#define MS_SYNC 2 /* synchronous memory sync */
|
|
#define MS_INVALIDATE 4 /* invalidate the caches */
|
|
|
|
#define MCL_CURRENT 8192 /* lock all currently mapped pages */
|
|
#define MCL_FUTURE 16384 /* lock all additions to address space */
|
|
|
|
#define MADV_NORMAL 0 /* no further special treatment */
|
|
#define MADV_RANDOM 1 /* expect random page references */
|
|
#define MADV_SEQUENTIAL 2 /* expect sequential page references */
|
|
#define MADV_WILLNEED 3 /* will need these pages */
|
|
#define MADV_SPACEAVAIL 5 /* ensure resources are available */
|
|
#define MADV_DONTNEED 6 /* don't need these pages */
|
|
|
|
/* common/generic parameters */
|
|
#define MADV_REMOVE 9 /* remove these pages & resources */
|
|
#define MADV_DONTFORK 10 /* don't inherit across fork */
|
|
#define MADV_DOFORK 11 /* do inherit across fork */
|
|
|
|
#define MADV_MERGEABLE 12 /* KSM may merge identical pages */
|
|
#define MADV_UNMERGEABLE 13 /* KSM may not merge identical pages */
|
|
|
|
/* compatibility flags */
|
|
#define MAP_FILE 0
|
|
|
|
#endif /* __ALPHA_MMAN_H__ */
|