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/*
* Copyright 2010 Tilera Corporation. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for
* more details.
*
* This file contains various random system calls that
* have a non-standard calling sequence on the Linux/TILE
* platform.
*/
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/syscalls.h>
#include <linux/mman.h>
#include <linux/file.h>
#include <linux/mempolicy.h>
#include <linux/binfmts.h>
#include <linux/fs.h>
#include <linux/compat.h>
#include <linux/uaccess.h>
#include <linux/signal.h>
#include <asm/syscalls.h>
#include <asm/pgtable.h>
#include <asm/homecache.h>
#include <asm/cachectl.h>
#include <asm/byteorder.h>
#include <arch/chip.h>
SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, len,
unsigned long, flags)
{
/* DCACHE is not particularly effective if not bound to one cpu. */
if (flags & DCACHE)
homecache_evict(cpumask_of(raw_smp_processor_id()));
if (flags & ICACHE)
flush_remote(0, HV_FLUSH_EVICT_L1I, mm_cpumask(current->mm),
0, 0, 0, NULL, NULL, 0);
return 0;
}
/*
* Syscalls that pass 64-bit values on 32-bit systems normally
* pass them as (low,high) word packed into the immediately adjacent
* registers. If the low word naturally falls on an even register,
* our ABI makes it work correctly; if not, we adjust it here.
* Handling it here means we don't have to fix uclibc AND glibc AND
* any other standard libcs we want to support.
*/
#if !defined(__tilegx__) || defined(CONFIG_COMPAT)
#ifdef __BIG_ENDIAN
#define SYSCALL_PAIR(name) u32 name ## _hi, u32 name ## _lo
#else
#define SYSCALL_PAIR(name) u32 name ## _lo, u32 name ## _hi
#endif
ssize_t sys32_readahead(int fd, SYSCALL_PAIR(offset), u32 count)
{
return sys_readahead(fd, ((loff_t)offset_hi << 32) | offset_lo, count);
}
int sys32_fadvise64_64(int fd, SYSCALL_PAIR(offset),
SYSCALL_PAIR(len), int advice)
{
return sys_fadvise64_64(fd, ((loff_t)offset_hi << 32) | offset_lo,
((loff_t)len_hi << 32) | len_lo, advice);
}
#endif /* 32-bit syscall wrappers */
/* Note: used by the compat code even in 64-bit Linux. */
SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
unsigned long, prot, unsigned long, flags,
unsigned long, fd, unsigned long, off_4k)
{
#define PAGE_ADJUST (PAGE_SHIFT - 12)
if (off_4k & ((1 << PAGE_ADJUST) - 1))
return -EINVAL;
return sys_mmap_pgoff(addr, len, prot, flags, fd,
off_4k >> PAGE_ADJUST);
}
#ifdef __tilegx__
SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
unsigned long, prot, unsigned long, flags,
unsigned long, fd, off_t, offset)
{
if (offset & ((1 << PAGE_SHIFT) - 1))
return -EINVAL;
return sys_mmap_pgoff(addr, len, prot, flags, fd,
offset >> PAGE_SHIFT);
}
#endif
/* Provide the actual syscall number to call mapping. */
#undef __SYSCALL
#define __SYSCALL(nr, call) [nr] = (call),
#ifndef __tilegx__
/* See comments at the top of the file. */
#define sys_fadvise64_64 sys32_fadvise64_64
#define sys_readahead sys32_readahead
#endif
/* Call the assembly trampolines where necessary. */
#undef sys_rt_sigreturn
#define sys_rt_sigreturn _sys_rt_sigreturn
#define sys_clone _sys_clone
/*
* Note that we can't include <linux/unistd.h> here since the header
* guard will defeat us; <asm/unistd.h> checks for __SYSCALL as well.
*/
void *sys_call_table[__NR_syscalls] = {
[0 ... __NR_syscalls-1] = sys_ni_syscall,
#include <asm/unistd.h>
};
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