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 <arch/chip.h>
 36
 37SYSCALL_DEFINE0(flush_cache)
 38{
 39	homecache_evict(cpumask_of(smp_processor_id()));
 40	return 0;
 41}
 42
 43/*
 44 * Syscalls that pass 64-bit values on 32-bit systems normally
 45 * pass them as (low,high) word packed into the immediately adjacent
 46 * registers.  If the low word naturally falls on an even register,
 47 * our ABI makes it work correctly; if not, we adjust it here.
 48 * Handling it here means we don't have to fix uclibc AND glibc AND
 49 * any other standard libcs we want to support.
 50 */
 51
 52#if !defined(__tilegx__) || defined(CONFIG_COMPAT)
 53
 54ssize_t sys32_readahead(int fd, u32 offset_lo, u32 offset_hi, u32 count)
 55{
 56	return sys_readahead(fd, ((loff_t)offset_hi << 32) | offset_lo, count);
 57}
 58
 59int sys32_fadvise64_64(int fd, u32 offset_lo, u32 offset_hi,
 60		       u32 len_lo, u32 len_hi, int advice)
 61{
 62	return sys_fadvise64_64(fd, ((loff_t)offset_hi << 32) | offset_lo,
 63				((loff_t)len_hi << 32) | len_lo, advice);
 64}
 65
 66#endif /* 32-bit syscall wrappers */
 67
 68/* Note: used by the compat code even in 64-bit Linux. */
 69SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
 70		unsigned long, prot, unsigned long, flags,
 71		unsigned long, fd, unsigned long, off_4k)
 72{
 73#define PAGE_ADJUST (PAGE_SHIFT - 12)
 74	if (off_4k & ((1 << PAGE_ADJUST) - 1))
 75		return -EINVAL;
 76	return sys_mmap_pgoff(addr, len, prot, flags, fd,
 77			      off_4k >> PAGE_ADJUST);
 78}
 79
 80#ifdef __tilegx__
 81SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
 82		unsigned long, prot, unsigned long, flags,
 83		unsigned long, fd, off_t, offset)
 84{
 85	if (offset & ((1 << PAGE_SHIFT) - 1))
 86		return -EINVAL;
 87	return sys_mmap_pgoff(addr, len, prot, flags, fd,
 88			      offset >> PAGE_SHIFT);
 89}
 90#endif
 91
 92
 93/* Provide the actual syscall number to call mapping. */
 94#undef __SYSCALL
 95#define __SYSCALL(nr, call) [nr] = (call),
 96
 97#ifndef __tilegx__
 98/* See comments at the top of the file. */
 99#define sys_fadvise64_64 sys32_fadvise64_64
100#define sys_readahead sys32_readahead
101#endif
102
103/* Call the trampolines to manage pt_regs where necessary. */
104#define sys_execve _sys_execve
105#define sys_sigaltstack _sys_sigaltstack
106#define sys_rt_sigreturn _sys_rt_sigreturn
107#define sys_clone _sys_clone
108#ifndef __tilegx__
109#define sys_cmpxchg_badaddr _sys_cmpxchg_badaddr
110#endif
111
112/*
113 * Note that we can't include <linux/unistd.h> here since the header
114 * guard will defeat us; <asm/unistd.h> checks for __SYSCALL as well.
115 */
116void *sys_call_table[__NR_syscalls] = {
117	[0 ... __NR_syscalls-1] = sys_ni_syscall,
118#include <asm/unistd.h>
119};