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};