From 95119fbd87aabc263746731462062af5a38c0222 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Thu, 11 Oct 2007 11:17:18 +0200 Subject: x86_64: move mm Signed-off-by: Thomas Gleixner Signed-off-by: Ingo Molnar --- arch/x86/mm/mmap_64.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 arch/x86/mm/mmap_64.c (limited to 'arch/x86/mm/mmap_64.c') diff --git a/arch/x86/mm/mmap_64.c b/arch/x86/mm/mmap_64.c new file mode 100644 index 000000000000..80bba0dc000e --- /dev/null +++ b/arch/x86/mm/mmap_64.c @@ -0,0 +1,29 @@ +/* Copyright 2005 Andi Kleen, SuSE Labs. + * Licensed under GPL, v.2 + */ +#include +#include +#include +#include + +/* Notebook: move the mmap code from sys_x86_64.c over here. */ + +void arch_pick_mmap_layout(struct mm_struct *mm) +{ +#ifdef CONFIG_IA32_EMULATION + if (current_thread_info()->flags & _TIF_IA32) + return ia32_pick_mmap_layout(mm); +#endif + mm->mmap_base = TASK_UNMAPPED_BASE; + if (current->flags & PF_RANDOMIZE) { + /* Add 28bit randomness which is about 40bits of address space + because mmap base has to be page aligned. + or ~1/128 of the total user VM + (total user address space is 47bits) */ + unsigned rnd = get_random_int() & 0xfffffff; + mm->mmap_base += ((unsigned long)rnd) << PAGE_SHIFT; + } + mm->get_unmapped_area = arch_get_unmapped_area; + mm->unmap_area = arch_unmap_area; +} + -- cgit v1.2.3-59-g8ed1b