linux/arch/tile/kernel/sys.c
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   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 <arch/chip.h>
  37
  38SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, len,
  39                unsigned long, flags)
  40{
  41        if (flags & DCACHE)
  42                homecache_evict(cpumask_of(smp_processor_id()));
  43        if (flags & ICACHE)
  44                flush_remote(0, HV_FLUSH_EVICT_L1I, mm_cpumask(current->mm),
  45                             0, 0, 0, NULL, NULL, 0);
  46        return 0;
  47}
  48
  49/*
  50 * Syscalls that pass 64-bit values on 32-bit systems normally
  51 * pass them as (low,high) word packed into the immediately adjacent
  52 * registers.  If the low word naturally falls on an even register,
  53 * our ABI makes it work correctly; if not, we adjust it here.
  54 * Handling it here means we don't have to fix uclibc AND glibc AND
  55 * any other standard libcs we want to support.
  56 */
  57
  58#if !defined(__tilegx__) || defined(CONFIG_COMPAT)
  59
  60ssize_t sys32_readahead(int fd, u32 offset_lo, u32 offset_hi, u32 count)
  61{
  62        return sys_readahead(fd, ((loff_t)offset_hi << 32) | offset_lo, count);
  63}
  64
  65int sys32_fadvise64_64(int fd, u32 offset_lo, u32 offset_hi,
  66                       u32 len_lo, u32 len_hi, int advice)
  67{
  68        return sys_fadvise64_64(fd, ((loff_t)offset_hi << 32) | offset_lo,
  69                                ((loff_t)len_hi << 32) | len_lo, advice);
  70}
  71
  72#endif /* 32-bit syscall wrappers */
  73
  74/* Note: used by the compat code even in 64-bit Linux. */
  75SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
  76                unsigned long, prot, unsigned long, flags,
  77                unsigned long, fd, unsigned long, off_4k)
  78{
  79#define PAGE_ADJUST (PAGE_SHIFT - 12)
  80        if (off_4k & ((1 << PAGE_ADJUST) - 1))
  81                return -EINVAL;
  82        return sys_mmap_pgoff(addr, len, prot, flags, fd,
  83                              off_4k >> PAGE_ADJUST);
  84}
  85
  86#ifdef __tilegx__
  87SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
  88                unsigned long, prot, unsigned long, flags,
  89                unsigned long, fd, off_t, offset)
  90{
  91        if (offset & ((1 << PAGE_SHIFT) - 1))
  92                return -EINVAL;
  93        return sys_mmap_pgoff(addr, len, prot, flags, fd,
  94                              offset >> PAGE_SHIFT);
  95}
  96#endif
  97
  98
  99/* Provide the actual syscall number to call mapping. */
 100#undef __SYSCALL
 101#define __SYSCALL(nr, call) [nr] = (call),
 102
 103#ifndef __tilegx__
 104/* See comments at the top of the file. */
 105#define sys_fadvise64_64 sys32_fadvise64_64
 106#define sys_readahead sys32_readahead
 107#endif
 108
 109/* Call the assembly trampolines where necessary. */
 110#undef sys_rt_sigreturn
 111#define sys_rt_sigreturn _sys_rt_sigreturn
 112#define sys_clone _sys_clone
 113
 114/*
 115 * Note that we can't include <linux/unistd.h> here since the header
 116 * guard will defeat us; <asm/unistd.h> checks for __SYSCALL as well.
 117 */
 118void *sys_call_table[__NR_syscalls] = {
 119        [0 ... __NR_syscalls-1] = sys_ni_syscall,
 120#include <asm/unistd.h>
 121};
 122