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 /*
  49  * sys_pipe() is the normal C calling standard for creating
  50  * a pipe. It's not the way unix traditionally does this, though.
  51  */
  52 asmlinkage int sys_pipe(unsigned long *fildes)
  53 {
  54         int fd[2];
  55         int error;
  56
  57         error = do_pipe(fd);
  58         if (!error) {
  59                 if (copy_to_user(fildes, fd, 2 * sizeof(int)))
  60                         error = -EFAULT;
  61         }
  62         return error;
  63 }
  64
  65 /* common code for old and new mmaps */
  66 static inline long
  67 do_mmap2(unsigned long addr, unsigned long len,
  68          unsigned long prot, unsigned long flags,
  69          unsigned long fd, unsigned long pgoff)
  70 {
  71         int error = -EBADF;
  72         struct file *file = NULL;
  73
  74         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  75         if (!(flags & MAP_ANONYMOUS)) {
  76                 file = fget(fd);
  77                 if (!file)
  78                         goto out;
  79         }
  80
  81         down_write(&current->mm->mmap_sem);
  82         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
  83         up_write(&current->mm->mmap_sem);
  84
  85         if (file)
  86                 fput(file);
  87  out:
  88         return error;
  89 }
  90
  91 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
  92                           unsigned long prot, unsigned long flags,
  93                           unsigned long fd, unsigned long pgoff)
  94 {
  95         return do_mmap2(addr, len, prot, flags, fd, pgoff);
  96 }
  97
  98 asmlinkage int sys_getpagesize(void)
  99 {
 100         return PAGE_SIZE;
 101 }
 102
 103 asmlinkage void *sys_sram_alloc(size_t size, unsigned long flags)
 104 {
 105         return sram_alloc_with_lsl(size, flags);
 106 }
 107
 108 asmlinkage int sys_sram_free(const void *addr)
 109 {
 110         return sram_free_with_lsl(addr);
 111 }
 112
 113 asmlinkage void *sys_dma_memcpy(void *dest, const void *src, size_t len)
 114 {
 115         return safe_dma_memcpy(dest, src, len);
 116 }