arch/blackfin/kernel/sys_bfin.c

   1 /*
   2  * contains various random system calls that have a non-standard
   3  * calling sequence on the Linux/Blackfin platform.
   4  *
   5  * Copyright 2004-2009 Analog Devices Inc.
   6  *
   7  * Licensed under the GPL-2 or later
   8  */
   9
  10 #include <linux/spinlock.h>
  11 #include <linux/sem.h>
  12 #include <linux/msg.h>
  13 #include <linux/shm.h>
  14 #include <linux/syscalls.h>
  15 #include <linux/mman.h>
  16 #include <linux/file.h>
  17 #include <linux/fs.h>
  18 #include <linux/uaccess.h>
  19 #include <linux/ipc.h>
  20 #include <linux/unistd.h>
  21
  22 #include <asm/cacheflush.h>
  23 #include <asm/dma.h>
  24
  25 /* common code for old and new mmaps */
  26 static inline long
  27 do_mmap2(unsigned long addr, unsigned long len,
  28          unsigned long prot, unsigned long flags,
  29          unsigned long fd, unsigned long pgoff)
  30 {
  31         int error = -EBADF;
  32         struct file *file = NULL;
  33
  34         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  35         if (!(flags & MAP_ANONYMOUS)) {
  36                 file = fget(fd);
  37                 if (!file)
  38                         goto out;
  39         }
  40
  41         down_write(&current->mm->mmap_sem);
  42         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
  43         up_write(&current->mm->mmap_sem);
  44
  45         if (file)
  46                 fput(file);
  47  out:
  48         return error;
  49 }
  50
  51 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
  52                           unsigned long prot, unsigned long flags,
  53                           unsigned long fd, unsigned long pgoff)
  54 {
  55         return do_mmap2(addr, len, prot, flags, fd, pgoff);
  56 }
  57
  58 asmlinkage void *sys_sram_alloc(size_t size, unsigned long flags)
  59 {
  60         return sram_alloc_with_lsl(size, flags);
  61 }
  62
  63 asmlinkage int sys_sram_free(const void *addr)
  64 {
  65         return sram_free_with_lsl(addr);
  66 }
  67
  68 asmlinkage void *sys_dma_memcpy(void *dest, const void *src, size_t len)
  69 {
  70         return safe_dma_memcpy(dest, src, len);
  71 }
  72
  73 #if defined(CONFIG_FB) || defined(CONFIG_FB_MODULE)
  74 #include <linux/fb.h>
  75 unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr,
  76         unsigned long len, unsigned long pgoff, unsigned long flags)
  77 {
  78         struct fb_info *info = filp->private_data;
  79         return (unsigned long)info->screen_base;
  80 }
  81 EXPORT_SYMBOL(get_fb_unmapped_area);
  82 #endif