Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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};