tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
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 <arch/chip.h>
36
37SYSCALL_DEFINE0(flush_cache)
38{
39 homecache_evict(cpumask_of(smp_processor_id()));
40 return 0;
41}
42
43/*
44 * Syscalls that pass 64-bit values on 32-bit systems normally
45 * pass them as (low,high) word packed into the immediately adjacent
46 * registers. If the low word naturally falls on an even register,
47 * our ABI makes it work correctly; if not, we adjust it here.
48 * Handling it here means we don't have to fix uclibc AND glibc AND
49 * any other standard libcs we want to support.
50 */
51
52#if !defined(__tilegx__) || defined(CONFIG_COMPAT)
53
54ssize_t sys32_readahead(int fd, u32 offset_lo, u32 offset_hi, u32 count)
55{
56 return sys_readahead(fd, ((loff_t)offset_hi << 32) | offset_lo, count);
57}
58
59long sys32_fadvise64(int fd, u32 offset_lo, u32 offset_hi,
60 u32 len, int advice)
61{
62 return sys_fadvise64_64(fd, ((loff_t)offset_hi << 32) | offset_lo,
63 len, advice);
64}
65
66int sys32_fadvise64_64(int fd, u32 offset_lo, u32 offset_hi,
67 u32 len_lo, u32 len_hi, int advice)
68{
69 return sys_fadvise64_64(fd, ((loff_t)offset_hi << 32) | offset_lo,
70 ((loff_t)len_hi << 32) | len_lo, advice);
71}
72
73#endif /* 32-bit syscall wrappers */
74
75/* Note: used by the compat code even in 64-bit Linux. */
76SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
77 unsigned long, prot, unsigned long, flags,
78 unsigned long, fd, unsigned long, off_4k)
79{
80#define PAGE_ADJUST (PAGE_SHIFT - 12)
81 if (off_4k & ((1 << PAGE_ADJUST) - 1))
82 return -EINVAL;
83 return sys_mmap_pgoff(addr, len, prot, flags, fd,
84 off_4k >> PAGE_ADJUST);
85}
86
87#ifdef __tilegx__
88SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
89 unsigned long, prot, unsigned long, flags,
90 unsigned long, fd, off_t, offset)
91{
92 if (offset & ((1 << PAGE_SHIFT) - 1))
93 return -EINVAL;
94 return sys_mmap_pgoff(addr, len, prot, flags, fd,
95 offset >> PAGE_SHIFT);
96}
97#endif
98
99
100/* Provide the actual syscall number to call mapping. */
101#undef __SYSCALL
102#define __SYSCALL(nr, call) [nr] = (call),
103
104#ifndef __tilegx__
105/* See comments at the top of the file. */
106#define sys_fadvise64 sys32_fadvise64
107#define sys_fadvise64_64 sys32_fadvise64_64
108#define sys_readahead sys32_readahead
109#define sys_sync_file_range sys_sync_file_range2
110#endif
111
112/* Call the trampolines to manage pt_regs where necessary. */
113#define sys_execve _sys_execve
114#define sys_sigaltstack _sys_sigaltstack
115#define sys_rt_sigreturn _sys_rt_sigreturn
116#define sys_clone _sys_clone
117#ifndef __tilegx__
118#define sys_cmpxchg_badaddr _sys_cmpxchg_badaddr
119#endif
120
121/*
122 * Note that we can't include <linux/unistd.h> here since the header
123 * guard will defeat us; <asm/unistd.h> checks for __SYSCALL as well.
124 */
125void *sys_call_table[__NR_syscalls] = {
126 [0 ... __NR_syscalls-1] = sys_ni_syscall,
127#include <asm/unistd.h>
128};