arch/tile/kernel/sys.c

   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
  37 SYSCALL_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
  54 ssize_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
  59 int sys32_fadvise64_64(int fd, u32 offset_lo, u32 offset_hi,
  60                        u32 len_lo, u32 len_hi, int advice)
  61 {
  62         return sys_fadvise64_64(fd, ((loff_t)offset_hi << 32) | offset_lo,
  63                                 ((loff_t)len_hi << 32) | len_lo, advice);
  64 }
  65
  66 #endif /* 32-bit syscall wrappers */
  67
  68 /* Note: used by the compat code even in 64-bit Linux. */
  69 SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
  70                 unsigned long, prot, unsigned long, flags,
  71                 unsigned long, fd, unsigned long, off_4k)
  72 {
  73 #define PAGE_ADJUST (PAGE_SHIFT - 12)
  74         if (off_4k & ((1 << PAGE_ADJUST) - 1))
  75                 return -EINVAL;
  76         return sys_mmap_pgoff(addr, len, prot, flags, fd,
  77                               off_4k >> PAGE_ADJUST);
  78 }
  79
  80 #ifdef __tilegx__
  81 SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
  82                 unsigned long, prot, unsigned long, flags,
  83                 unsigned long, fd, off_t, offset)
  84 {
  85         if (offset & ((1 << PAGE_SHIFT) - 1))
  86                 return -EINVAL;
  87         return sys_mmap_pgoff(addr, len, prot, flags, fd,
  88                               offset >> PAGE_SHIFT);
  89 }
  90 #endif
  91
  92
  93 /* Provide the actual syscall number to call mapping. */
  94 #undef __SYSCALL
  95 #define __SYSCALL(nr, call) [nr] = (call),
  96
  97 #ifndef __tilegx__
  98 /* See comments at the top of the file. */
  99 #define sys_fadvise64_64 sys32_fadvise64_64
 100 #define sys_readahead sys32_readahead
 101 #endif
 102
 103 /* Call the trampolines to manage pt_regs where necessary. */
 104 #define sys_execve _sys_execve
 105 #define sys_sigaltstack _sys_sigaltstack
 106 #define sys_rt_sigreturn _sys_rt_sigreturn
 107 #define sys_clone _sys_clone
 108 #ifndef __tilegx__
 109 #define sys_cmpxchg_badaddr _sys_cmpxchg_badaddr
 110 #endif
 111
 112 /*
 113  * Note that we can't include <linux/unistd.h> here since the header
 114  * guard will defeat us; <asm/unistd.h> checks for __SYSCALL as well.
 115  */
 116 void *sys_call_table[__NR_syscalls] = {
 117         [0 ... __NR_syscalls-1] = sys_ni_syscall,
 118 #include <asm/unistd.h>
 119 };