release/src-rt-6.x.4708/linux/linux-2.6.36/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 asmlinkage void *sys_sram_alloc(size_t size, unsigned long flags)
  26 {
  27         return sram_alloc_with_lsl(size, flags);
  28 }
  29
  30 asmlinkage int sys_sram_free(const void *addr)
  31 {
  32         return sram_free_with_lsl(addr);
  33 }
  34
  35 asmlinkage void *sys_dma_memcpy(void *dest, const void *src, size_t len)
  36 {
  37         return safe_dma_memcpy(dest, src, len);
  38 }
  39
  40 #if defined(CONFIG_FB) || defined(CONFIG_FB_MODULE)
  41 #include <linux/fb.h>
  42 unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr,
  43         unsigned long len, unsigned long pgoff, unsigned long flags)
  44 {
  45         struct fb_info *info = filp->private_data;
  46         return (unsigned long)info->screen_base;
  47 }
  48 EXPORT_SYMBOL(get_fb_unmapped_area);
  49 #endif
  50
  51 /* Needed for legacy userspace atomic emulation */
  52 static DEFINE_SPINLOCK(bfin_spinlock_lock);
  53
  54 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
  55 __attribute__((l1_text))
  56 #endif
  57 asmlinkage int sys_bfin_spinlock(int *p)
  58 {
  59         int ret, tmp = 0;
  60
  61         spin_lock(&bfin_spinlock_lock); /* This would also hold kernel preemption. */
  62         ret = get_user(tmp, p);
  63         if (likely(ret == 0)) {
  64                 if (unlikely(tmp))
  65                         ret = 1;
  66                 else
  67                         put_user(1, p);
  68         }
  69         spin_unlock(&bfin_spinlock_lock);
  70
  71         return ret;
  72 }