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 #include <asm/cachectl.h>
  25 #include <asm/ptrace.h>
  26
  27 asmlinkage void *sys_sram_alloc(size_t size, unsigned long flags)
  28 {
  29         return sram_alloc_with_lsl(size, flags);
  30 }
  31
  32 asmlinkage int sys_sram_free(const void *addr)
  33 {
  34         return sram_free_with_lsl(addr);
  35 }
  36
  37 asmlinkage void *sys_dma_memcpy(void *dest, const void *src, size_t len)
  38 {
  39         return safe_dma_memcpy(dest, src, len);
  40 }
  41
  42 #if defined(CONFIG_FB) || defined(CONFIG_FB_MODULE)
  43 #include <linux/fb.h>
  44 unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr,
  45         unsigned long len, unsigned long pgoff, unsigned long flags)
  46 {
  47         struct fb_info *info = filp->private_data;
  48         return (unsigned long)info->screen_base;
  49 }
  50 EXPORT_SYMBOL(get_fb_unmapped_area);
  51 #endif
  52
  53 /* Needed for legacy userspace atomic emulation */
  54 static DEFINE_SPINLOCK(bfin_spinlock_lock);
  55
  56 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
  57 __attribute__((l1_text))
  58 #endif
  59 asmlinkage int sys_bfin_spinlock(int *p)
  60 {
  61         int ret, tmp = 0;
  62
  63         spin_lock(&bfin_spinlock_lock); /* This would also hold kernel preemption. */
  64         ret = get_user(tmp, p);
  65         if (likely(ret == 0)) {
  66                 if (unlikely(tmp))
  67                         ret = 1;
  68                 else
  69                         put_user(1, p);
  70         }
  71         spin_unlock(&bfin_spinlock_lock);
  72
  73         return ret;
  74 }
  75
  76 SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, len, int, op)
  77 {
  78         if (is_user_addr_valid(current, addr, len) != 0)
  79                 return -EINVAL;
  80
  81         if (op & DCACHE)
  82                 blackfin_dcache_flush_range(addr, addr + len);
  83         if (op & ICACHE)
  84                 blackfin_icache_flush_range(addr, addr + len);
  85
  86         return 0;
  87 }