LXR linux/arch/c6x/kernel/sys

   1/*
   2 *  Port on Texas Instruments TMS320C6x architecture
   3 *
   4 *  Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
   5 *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
   6 *
   7 *  This program is free software; you can redistribute it and/or modify
   8 *  it under the terms of the GNU General Public License version 2 as
   9 *  published by the Free Software Foundation.
  10 */
  11#include <linux/module.h>
  12#include <linux/syscalls.h>
  13#include <linux/uaccess.h>
  14
  15#include <asm/syscalls.h>
  16
  17#ifdef CONFIG_ACCESS_CHECK
  18int _access_ok(unsigned long addr, unsigned long size)
  19{
  20        if (!size)
  21                return 1;
  22
  23        if (!addr || addr > (0xffffffffUL - (size - 1)))
  24                goto _bad_access;
  25
  26        if (segment_eq(get_fs(), KERNEL_DS))
  27                return 1;
  28
  29        if (memory_start <= addr && (addr + size - 1) < memory_end)
  30                return 1;
  31
  32_bad_access:
  33        pr_debug("Bad access attempt: pid[%d] addr[%08lx] size[0x%lx]\n",
  34                 current->pid, addr, size);
  35        return 0;
  36}
  37EXPORT_SYMBOL(_access_ok);
  38#endif
  39
  40/* sys_cache_sync -- sync caches over given range */
  41asmlinkage int sys_cache_sync(unsigned long s, unsigned long e)
  42{
  43        L1D_cache_block_writeback_invalidate(s, e);
  44        L1P_cache_block_invalidate(s, e);
  45
  46        return 0;
  47}
  48
  49/* Provide the actual syscall number to call mapping. */
  50#undef __SYSCALL
  51#define __SYSCALL(nr, call) [nr] = (call),
  52
  53/*
  54 * Use trampolines
  55 */
  56#define sys_pread64             sys_pread_c6x
  57#define sys_pwrite64            sys_pwrite_c6x
  58#define sys_truncate64          sys_truncate64_c6x
  59#define sys_ftruncate64         sys_ftruncate64_c6x
  60#define sys_fadvise64           sys_fadvise64_c6x
  61#define sys_fadvise64_64        sys_fadvise64_64_c6x
  62#define sys_fallocate           sys_fallocate_c6x
  63
  64/* Use sys_mmap_pgoff directly */
  65#define sys_mmap2 sys_mmap_pgoff
  66
  67/*
  68 * Note that we can't include <linux/unistd.h> here since the header
  69 * guard will defeat us; <asm/unistd.h> checks for __SYSCALL as well.
  70 */
  71void *sys_call_table[__NR_syscalls] = {
  72        [0 ... __NR_syscalls-1] = sys_ni_syscall,
  73#include <asm/unistd.h>
  74};
  75