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 trampolines to manage pt_regs where necessary. */
110#define sys_execve _sys_execve
111#define sys_sigaltstack _sys_sigaltstack
112#define sys_rt_sigreturn _sys_rt_sigreturn
113#define sys_clone _sys_clone
114#ifndef __tilegx__
115#define sys_cmpxchg_badaddr _sys_cmpxchg_badaddr
116#endif
117
118/*
119 * Note that we can't include <linux/unistd.h> here since the header
120 * guard will defeat us; <asm/unistd.h> checks for __SYSCALL as well.
121 */
122void *sys_call_table[__NR_syscalls] = {
123	[0 ... __NR_syscalls-1] = sys_ni_syscall,
124#include <asm/unistd.h>
125};