LXR linux/arch/tile/kernel/sys.c

   1/*
   2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
   3 *
   4 *   This program is free software; you can redistribute it and/or
   5 *   modify it under the terms of the GNU General Public License
   6 *   as published by the Free Software Foundation, version 2.
   7 *
   8 *   This program is distributed in the hope that it will be useful, but
   9 *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11 *   NON INFRINGEMENT.  See the GNU General Public License for
  12 *   more details.
  13 *
  14 * This file contains various random system calls that
  15 * have a non-standard calling sequence on the Linux/TILE
  16 * platform.
  17 */
  18
  19#include <linux/errno.h>
  20#include <linux/sched.h>
  21#include <linux/mm.h>
  22#include <linux/smp.h>
  23#include <linux/syscalls.h>
  24#include <linux/mman.h>
  25#include <linux/file.h>
  26#include <linux/mempolicy.h>
  27#include <linux/binfmts.h>
  28#include <linux/fs.h>
  29#include <linux/compat.h>
  30#include <linux/uaccess.h>
  31#include <linux/signal.h>
  32#include <asm/syscalls.h>
  33#include <asm/pgtable.h>
  34#include <asm/homecache.h>
  35#include <asm/cachectl.h>
  36#include <asm/byteorder.h>
  37#include <arch/chip.h>
  38
  39SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, len,
  40                unsigned long, flags)
  41{
  42        /* DCACHE is not particularly effective if not bound to one cpu. */
  43        if (flags & DCACHE)
  44                homecache_evict(cpumask_of(raw_smp_processor_id()));
  45
  46        if (flags & ICACHE)
  47                flush_remote(0, HV_FLUSH_EVICT_L1I, mm_cpumask(current->mm),
  48                             0, 0, 0, NULL, NULL, 0);
  49        return 0;
  50}
  51
  52/*
  53 * Syscalls that pass 64-bit values on 32-bit systems normally
  54 * pass them as (low,high) word packed into the immediately adjacent
  55 * registers.  If the low word naturally falls on an even register,
  56 * our ABI makes it work correctly; if not, we adjust it here.
  57 * Handling it here means we don't have to fix uclibc AND glibc AND
  58 * any other standard libcs we want to support.
  59 */
  60
  61#if !defined(__tilegx__) || defined(CONFIG_COMPAT)
  62
  63#ifdef __BIG_ENDIAN
  64#define SYSCALL_PAIR(name) u32 name ## _hi, u32 name ## _lo
  65#else
  66#define SYSCALL_PAIR(name) u32 name ## _lo, u32 name ## _hi
  67#endif
  68
  69ssize_t sys32_readahead(int fd, SYSCALL_PAIR(offset), u32 count)
  70{
  71        return sys_readahead(fd, ((loff_t)offset_hi << 32) | offset_lo, count);
  72}
  73
  74int sys32_fadvise64_64(int fd, SYSCALL_PAIR(offset),
  75                       SYSCALL_PAIR(len), int advice)
  76{
  77        return sys_fadvise64_64(fd, ((loff_t)offset_hi << 32) | offset_lo,
  78                                ((loff_t)len_hi << 32) | len_lo, advice);
  79}
  80
  81#endif /* 32-bit syscall wrappers */
  82
  83/* Note: used by the compat code even in 64-bit Linux. */
  84SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
  85                unsigned long, prot, unsigned long, flags,
  86                unsigned long, fd, unsigned long, off_4k)
  87{
  88#define PAGE_ADJUST (PAGE_SHIFT - 12)
  89        if (off_4k & ((1 << PAGE_ADJUST) - 1))
  90                return -EINVAL;
  91        return sys_mmap_pgoff(addr, len, prot, flags, fd,
  92                              off_4k >> PAGE_ADJUST);
  93}
  94
  95#ifdef __tilegx__
  96SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
  97                unsigned long, prot, unsigned long, flags,
  98                unsigned long, fd, off_t, offset)
  99{
 100        if (offset & ((1 << PAGE_SHIFT) - 1))
 101                return -EINVAL;
 102        return sys_mmap_pgoff(addr, len, prot, flags, fd,
 103                              offset >> PAGE_SHIFT);
 104}
 105#endif
 106
 107
 108/* Provide the actual syscall number to call mapping. */
 109#undef __SYSCALL
 110#define __SYSCALL(nr, call) [nr] = (call),
 111
 112#ifndef __tilegx__
 113/* See comments at the top of the file. */
 114#define sys_fadvise64_64 sys32_fadvise64_64
 115#define sys_readahead sys32_readahead
 116#endif
 117
 118/* Call the assembly trampolines where necessary. */
 119#undef sys_rt_sigreturn
 120#define sys_rt_sigreturn _sys_rt_sigreturn
 121#define sys_clone _sys_clone
 122
 123/*
 124 * Note that we can't include <linux/unistd.h> here since the header
 125 * guard will defeat us; <asm/unistd.h> checks for __SYSCALL as well.
 126 */
 127void *sys_call_table[__NR_syscalls] = {
 128        [0 ... __NR_syscalls-1] = sys_ni_syscall,
 129#include <asm/unistd.h>
 130};
 131