/* * Copyright (C) 2013 Altera Corporation * Copyright (C) 2011-2012 Tobias Klauser <tklauser@distanz.ch> * Copyright (C) 2004 Microtronix Datacom Ltd. * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. */ #include <linux/export.h> #include <linux/file.h> #include <linux/fs.h> #include <linux/slab.h> #include <linux/syscalls.h> #include <asm/cacheflush.h> #include <asm/traps.h> /* sys_cacheflush -- flush the processor cache. */ asmlinkage int sys_cacheflush(unsigned long addr, unsigned long len, unsigned int op) { struct vm_area_struct *vma; struct mm_struct *mm = current->mm; if (len == 0) return 0; /* We only support op 0 now, return error if op is non-zero.*/ if (op) return -EINVAL; /* Check for overflow */ if (addr + len < addr) return -EFAULT; if (mmap_read_lock_killable(mm)) return -EINTR; /* * Verify that the specified address region actually belongs * to this process. */ vma = find_vma(mm, addr); if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end) { mmap_read_unlock(mm); return -EFAULT; } flush_cache_range(vma, addr, addr + len); mmap_read_unlock(mm); return 0; } asmlinkage int sys_getpagesize(void) { return PAGE_SIZE; }