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/smp_lock.h>
  24 #include <linux/syscalls.h>
  25 #include <linux/mman.h>
  26 #include <linux/file.h>
  27 #include <linux/mempolicy.h>
  28 #include <linux/binfmts.h>
  29 #include <linux/fs.h>
  30 #include <linux/syscalls.h>
  31 #include <linux/uaccess.h>
  32 #include <linux/signal.h>
  33 #include <asm/syscalls.h>
  34
  35 #include <asm/pgtable.h>
  36 #include <asm/homecache.h>
  37 #include <arch/chip.h>
  38
  39 SYSCALL_DEFINE0(flush_cache)
  40 {
  41         homecache_evict(cpumask_of(smp_processor_id()));
  42         return 0;
  43 }
  44
  45 /*
  46  * Syscalls that pass 64-bit values on 32-bit systems normally
  47  * pass them as (low,high) word packed into the immediately adjacent
  48  * registers.  If the low word naturally falls on an even register,
  49  * our ABI makes it work correctly; if not, we adjust it here.
  50  * Handling it here means we don't have to fix uclibc AND glibc AND
  51  * any other standard libcs we want to support.
  52  */
  53
  54 #if !defined(__tilegx__) || defined(CONFIG_COMPAT)
  55
  56 ssize_t sys32_readahead(int fd, u32 offset_lo, u32 offset_hi, u32 count)
  57 {
  58         return sys_readahead(fd, ((loff_t)offset_hi << 32) | offset_lo, count);
  59 }
  60
  61 long sys32_fadvise64(int fd, u32 offset_lo, u32 offset_hi,
  62                      u32 len, int advice)
  63 {
  64         return sys_fadvise64_64(fd, ((loff_t)offset_hi << 32) | offset_lo,
  65                                 len, advice);
  66 }
  67
  68 int sys32_fadvise64_64(int fd, u32 offset_lo, u32 offset_hi,
  69                        u32 len_lo, u32 len_hi, int advice)
  70 {
  71         return sys_fadvise64_64(fd, ((loff_t)offset_hi << 32) | offset_lo,
  72                                 ((loff_t)len_hi << 32) | len_lo, advice);
  73 }
  74
  75 #endif /* 32-bit syscall wrappers */
  76
  77 /*
  78  * This API uses a 4KB-page-count offset into the file descriptor.
  79  * It is likely not the right API to use on a 64-bit platform.
  80  */
  81 SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
  82                 unsigned long, prot, unsigned long, flags,
  83                 unsigned long, fd, unsigned long, off_4k)
  84 {
  85 #define PAGE_ADJUST (PAGE_SHIFT - 12)
  86         if (off_4k & ((1 << PAGE_ADJUST) - 1))
  87                 return -EINVAL;
  88         return sys_mmap_pgoff(addr, len, prot, flags, fd,
  89                               off_4k >> PAGE_ADJUST);
  90 }
  91
  92 /*
  93  * This API uses a byte offset into the file descriptor.
  94  * It is likely not the right API to use on a 32-bit platform.
  95  */
  96 SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
  97                 unsigned long, prot, unsigned long, flags,
  98                 unsigned long, fd, unsigned long, offset)
  99 {
 100         if (offset & ((1 << PAGE_SHIFT) - 1))
 101                 return -EINVAL;
 102         return sys_mmap_pgoff(addr, len, prot, flags, fd,
 103                               offset >> PAGE_SHIFT);
 104 }
 105
 106
 107 /* Provide the actual syscall number to call mapping. */
 108 #undef __SYSCALL
 109 #define __SYSCALL(nr, call) [nr] = (call),
 110
 111 #ifndef __tilegx__
 112 /* See comments at the top of the file. */
 113 #define sys_fadvise64 sys32_fadvise64
 114 #define sys_fadvise64_64 sys32_fadvise64_64
 115 #define sys_readahead sys32_readahead
 116 #define sys_sync_file_range sys_sync_file_range2
 117 #endif
 118
 119 void *sys_call_table[__NR_syscalls] = {
 120         [0 ... __NR_syscalls-1] = sys_ni_syscall,
 121 #include <asm/unistd.h>
 122 };