LXR linux/arch/blackfin/kernel/sys

   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
  27asmlinkage void *sys_sram_alloc(size_t size, unsigned long flags)
  28{
  29        return sram_alloc_with_lsl(size, flags);
  30}
  31
  32asmlinkage int sys_sram_free(const void *addr)
  33{
  34        return sram_free_with_lsl(addr);
  35}
  36
  37asmlinkage 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#include <linux/export.h>
  45unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr,
  46        unsigned long len, unsigned long pgoff, unsigned long flags)
  47{
  48        struct fb_info *info = filp->private_data;
  49        return (unsigned long)info->screen_base;
  50}
  51EXPORT_SYMBOL(get_fb_unmapped_area);
  52#endif
  53
  54/* Needed for legacy userspace atomic emulation */
  55static DEFINE_SPINLOCK(bfin_spinlock_lock);
  56
  57#ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
  58__attribute__((l1_text))
  59#endif
  60asmlinkage int sys_bfin_spinlock(int *p)
  61{
  62        int ret, tmp = 0;
  63
  64        spin_lock(&bfin_spinlock_lock); /* This would also hold kernel preemption. */
  65        ret = get_user(tmp, p);
  66        if (likely(ret == 0)) {
  67                if (unlikely(tmp))
  68                        ret = 1;
  69                else
  70                        put_user(1, p);
  71        }
  72        spin_unlock(&bfin_spinlock_lock);
  73
  74        return ret;
  75}
  76
  77SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, len, int, op)
  78{
  79        if (is_user_addr_valid(current, addr, len) != 0)
  80                return -EINVAL;
  81
  82        if (op & DCACHE)
  83                blackfin_dcache_flush_range(addr, addr + len);
  84        if (op & ICACHE)
  85                blackfin_icache_flush_range(addr, addr + len);
  86
  87        return 0;
  88}
  89