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	/* DCACHE is not particularly effective if not bound to one cpu. */
 42	if (flags & DCACHE)
 43		homecache_evict(cpumask_of(raw_smp_processor_id()));
 44
 45	if (flags & ICACHE)
 46		flush_remote(0, HV_FLUSH_EVICT_L1I, mm_cpumask(current->mm),
 47			     0, 0, 0, NULL, NULL, 0);
 48	return 0;
 49}
 50
 51/*
 52 * Syscalls that pass 64-bit values on 32-bit systems normally
 53 * pass them as (low,high) word packed into the immediately adjacent
 54 * registers.  If the low word naturally falls on an even register,
 55 * our ABI makes it work correctly; if not, we adjust it here.
 56 * Handling it here means we don't have to fix uclibc AND glibc AND
 57 * any other standard libcs we want to support.
 58 */
 59
 60#if !defined(__tilegx__) || defined(CONFIG_COMPAT)
 61
 62ssize_t sys32_readahead(int fd, u32 offset_lo, u32 offset_hi, u32 count)
 63{
 64	return sys_readahead(fd, ((loff_t)offset_hi << 32) | offset_lo, count);
 65}
 66
 67int sys32_fadvise64_64(int fd, u32 offset_lo, u32 offset_hi,
 68		       u32 len_lo, u32 len_hi, int advice)
 69{
 70	return sys_fadvise64_64(fd, ((loff_t)offset_hi << 32) | offset_lo,
 71				((loff_t)len_hi << 32) | len_lo, advice);
 72}
 73
 74#endif /* 32-bit syscall wrappers */
 75
 76/* Note: used by the compat code even in 64-bit Linux. */
 77SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
 78		unsigned long, prot, unsigned long, flags,
 79		unsigned long, fd, unsigned long, off_4k)
 80{
 81#define PAGE_ADJUST (PAGE_SHIFT - 12)
 82	if (off_4k & ((1 << PAGE_ADJUST) - 1))
 83		return -EINVAL;
 84	return sys_mmap_pgoff(addr, len, prot, flags, fd,
 85			      off_4k >> PAGE_ADJUST);
 86}
 87
 88#ifdef __tilegx__
 89SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
 90		unsigned long, prot, unsigned long, flags,
 91		unsigned long, fd, off_t, offset)
 92{
 93	if (offset & ((1 << PAGE_SHIFT) - 1))
 94		return -EINVAL;
 95	return sys_mmap_pgoff(addr, len, prot, flags, fd,
 96			      offset >> PAGE_SHIFT);
 97}
 98#endif
 99
100
101/* Provide the actual syscall number to call mapping. */
102#undef __SYSCALL
103#define __SYSCALL(nr, call) [nr] = (call),
104
105#ifndef __tilegx__
106/* See comments at the top of the file. */
107#define sys_fadvise64_64 sys32_fadvise64_64
108#define sys_readahead sys32_readahead
109#endif
110
111/* Call the assembly trampolines where necessary. */
112#undef sys_rt_sigreturn
113#define sys_rt_sigreturn _sys_rt_sigreturn
114#define sys_clone _sys_clone
115
116/*
117 * Note that we can't include <linux/unistd.h> here since the header
118 * guard will defeat us; <asm/unistd.h> checks for __SYSCALL as well.
119 */
120void *sys_call_table[__NR_syscalls] = {
121	[0 ... __NR_syscalls-1] = sys_ni_syscall,
122#include <asm/unistd.h>
123};