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
  41 #include <asm/cacheflush.h>
  42 #include <asm/uaccess.h>
  43 #include <asm/ipc.h>
  44 #include <asm/dma.h>
  45 #include <asm/unistd.h>
  46
  47 /*
  48  * sys_pipe() is the normal C calling standard for creating
  49  * a pipe. It's not the way unix traditionally does this, though.
  50  */
  51 asmlinkage int sys_pipe(unsigned long *fildes)
  52 {
  53         int fd[2];
  54         int error;
  55
  56         error = do_pipe(fd);
  57         if (!error) {
  58                 if (copy_to_user(fildes, fd, 2 * sizeof(int)))
  59                         error = -EFAULT;
  60         }
  61         return error;
  62 }
  63
  64 /* common code for old and new mmaps */
  65 static inline long
  66 do_mmap2(unsigned long addr, unsigned long len,
  67          unsigned long prot, unsigned long flags,
  68          unsigned long fd, unsigned long pgoff)
  69 {
  70         int error = -EBADF;
  71         struct file *file = NULL;
  72
  73         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  74         if (!(flags & MAP_ANONYMOUS)) {
  75                 file = fget(fd);
  76                 if (!file)
  77                         goto out;
  78         }
  79
  80         down_write(&current->mm->mmap_sem);
  81         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
  82         up_write(&current->mm->mmap_sem);
  83
  84         if (file)
  85                 fput(file);
  86       out:
  87         return error;
  88 }
  89
  90 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
  91                           unsigned long prot, unsigned long flags,
  92                           unsigned long fd, unsigned long pgoff)
  93 {
  94         return do_mmap2(addr, len, prot, flags, fd, pgoff);
  95 }
  96
  97 asmlinkage int sys_getpagesize(void)
  98 {
  99         return PAGE_SIZE;
 100 }
 101
 102 asmlinkage void *sys_sram_alloc(size_t size, unsigned long flags)
 103 {
 104         return sram_alloc_with_lsl(size, flags);
 105 }
 106
 107 asmlinkage int sys_sram_free(const void *addr)
 108 {
 109         return sram_free_with_lsl(addr);
 110 }
 111
 112 asmlinkage void *sys_dma_memcpy(void *dest, const void *src, size_t len)
 113 {
 114         return safe_dma_memcpy(dest, src, len);
 115 }