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>
66 lines
2.1 KiB
C
66 lines
2.1 KiB
C
#ifndef _ASM_POWERPC_MMAN_H
|
|
#define _ASM_POWERPC_MMAN_H
|
|
|
|
#include <asm-generic/mman-common.h>
|
|
|
|
/*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#define PROT_SAO 0x10 /* Strong Access Ordering */
|
|
|
|
#define MAP_RENAME MAP_ANONYMOUS /* In SunOS terminology */
|
|
#define MAP_NORESERVE 0x40 /* don't reserve swap pages */
|
|
#define MAP_LOCKED 0x80
|
|
|
|
#define MAP_GROWSDOWN 0x0100 /* stack-like segment */
|
|
#define MAP_DENYWRITE 0x0800 /* ETXTBSY */
|
|
#define MAP_EXECUTABLE 0x1000 /* mark it as an executable */
|
|
|
|
#define MCL_CURRENT 0x2000 /* lock all currently mapped pages */
|
|
#define MCL_FUTURE 0x4000 /* lock all additions to address space */
|
|
|
|
#define MAP_POPULATE 0x8000 /* populate (prefault) pagetables */
|
|
#define MAP_NONBLOCK 0x10000 /* do not block on IO */
|
|
#define MAP_STACK 0x20000 /* give out an address that is best suited for process/thread stacks */
|
|
#define MAP_HUGETLB 0x40000 /* create a huge page mapping */
|
|
|
|
#ifdef __KERNEL__
|
|
#ifdef CONFIG_PPC64
|
|
|
|
#include <asm/cputable.h>
|
|
#include <linux/mm.h>
|
|
|
|
/*
|
|
* This file is included by linux/mman.h, so we can't use cacl_vm_prot_bits()
|
|
* here. How important is the optimization?
|
|
*/
|
|
static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot)
|
|
{
|
|
return (prot & PROT_SAO) ? VM_SAO : 0;
|
|
}
|
|
#define arch_calc_vm_prot_bits(prot) arch_calc_vm_prot_bits(prot)
|
|
|
|
static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags)
|
|
{
|
|
return (vm_flags & VM_SAO) ? __pgprot(_PAGE_SAO) : __pgprot(0);
|
|
}
|
|
#define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags)
|
|
|
|
static inline int arch_validate_prot(unsigned long prot)
|
|
{
|
|
if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM | PROT_SAO))
|
|
return 0;
|
|
if ((prot & PROT_SAO) && !cpu_has_feature(CPU_FTR_SAO))
|
|
return 0;
|
|
return 1;
|
|
}
|
|
#define arch_validate_prot(prot) arch_validate_prot(prot)
|
|
|
|
#endif /* CONFIG_PPC64 */
|
|
#endif /* __KERNEL__ */
|
|
#endif /* _ASM_POWERPC_MMAN_H */
|