arch/blackfin/kernel/sys_bfin.c

   1 /*
   2  * File:         arch/blackfin/kernel/sys_bfin.c
   3  * Based on:
   4  * Author:
   5  *
   6  * Created:
   7  * Description:  This file contains various random system calls that
   8  *               have a non-standard calling sequence on the Linux/bfin
   9  *               platform.
  10  *
  11  * Modified:
  12  *               Copyright 2004-2006 Analog Devices Inc.
  13  *
  14  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License as published by
  18  * the Free Software Foundation; either version 2 of the License, or
  19  * (at your option) any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, see the file COPYING, or write
  28  * to the Free Software Foundation, Inc.,
  29  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  30  */
  31
  32 #include <linux/smp_lock.h>
  33 #include <linux/spinlock.h>
  34 #include <linux/sem.h>
  35 #include <linux/msg.h>
  36 #include <linux/shm.h>
  37 #include <linux/syscalls.h>
  38 #include <linux/mman.h>
  39 #include <linux/file.h>
  40 #include <linux/fs.h>
  41 #include <linux/uaccess.h>
  42 #include <linux/ipc.h>
  43 #include <linux/unistd.h>
  44
  45 #include <asm/cacheflush.h>
  46 #include <asm/dma.h>
  47
  48 /* common code for old and new mmaps */
  49 static inline long
  50 do_mmap2(unsigned long addr, unsigned long len,
  51          unsigned long prot, unsigned long flags,
  52          unsigned long fd, unsigned long pgoff)
  53 {
  54         int error = -EBADF;
  55         struct file *file = NULL;
  56
  57         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  58         if (!(flags & MAP_ANONYMOUS)) {
  59                 file = fget(fd);
  60                 if (!file)
  61                         goto out;
  62         }
  63
  64         down_write(&current->mm->mmap_sem);
  65         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
  66         up_write(&current->mm->mmap_sem);
  67
  68         if (file)
  69                 fput(file);
  70  out:
  71         return error;
  72 }
  73
  74 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
  75                           unsigned long prot, unsigned long flags,
  76                           unsigned long fd, unsigned long pgoff)
  77 {
  78         return do_mmap2(addr, len, prot, flags, fd, pgoff);
  79 }
  80
  81 asmlinkage int sys_getpagesize(void)
  82 {
  83         return PAGE_SIZE;
  84 }
  85
  86 asmlinkage void *sys_sram_alloc(size_t size, unsigned long flags)
  87 {
  88         return sram_alloc_with_lsl(size, flags);
  89 }
  90
  91 asmlinkage int sys_sram_free(const void *addr)
  92 {
  93         return sram_free_with_lsl(addr);
  94 }
  95
  96 asmlinkage void *sys_dma_memcpy(void *dest, const void *src, size_t len)
  97 {
  98         return safe_dma_memcpy(dest, src, len);
  99 }