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 <asm/cachectl.h>
  36 #include <asm/byteorder.h>
  37 #include <arch/chip.h>
  38
  39 SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, len,
  40                 unsigned long, flags)
  41 {
  42         /* DCACHE is not particularly effective if not bound to one cpu. */
  43         if (flags & DCACHE)
  44                 homecache_evict(cpumask_of(raw_smp_processor_id()));
  45
  46         if (flags & ICACHE)
  47                 flush_remote(0, HV_FLUSH_EVICT_L1I, mm_cpumask(current->mm),
  48                              0, 0, 0, NULL, NULL, 0);
  49         return 0;
  50 }
  51
  52 /*
  53  * Syscalls that pass 64-bit values on 32-bit systems normally
  54  * pass them as (low,high) word packed into the immediately adjacent
  55  * registers.  If the low word naturally falls on an even register,
  56  * our ABI makes it work correctly; if not, we adjust it here.
  57  * Handling it here means we don't have to fix uclibc AND glibc AND
  58  * any other standard libcs we want to support.
  59  */
  60
  61 #if !defined(__tilegx__) || defined(CONFIG_COMPAT)
  62
  63 #ifdef __BIG_ENDIAN
  64 #define SYSCALL_PAIR(name) u32 name ## _hi, u32 name ## _lo
  65 #else
  66 #define SYSCALL_PAIR(name) u32 name ## _lo, u32 name ## _hi
  67 #endif
  68
  69 ssize_t sys32_readahead(int fd, SYSCALL_PAIR(offset), u32 count)
  70 {
  71         return sys_readahead(fd, ((loff_t)offset_hi << 32) | offset_lo, count);
  72 }
  73
  74 int sys32_fadvise64_64(int fd, SYSCALL_PAIR(offset),
  75                        SYSCALL_PAIR(len), int advice)
  76 {
  77         return sys_fadvise64_64(fd, ((loff_t)offset_hi << 32) | offset_lo,
  78                                 ((loff_t)len_hi << 32) | len_lo, advice);
  79 }
  80
  81 #endif /* 32-bit syscall wrappers */
  82
  83 /* Note: used by the compat code even in 64-bit Linux. */
  84 SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
  85                 unsigned long, prot, unsigned long, flags,
  86                 unsigned long, fd, unsigned long, off_4k)
  87 {
  88 #define PAGE_ADJUST (PAGE_SHIFT - 12)
  89         if (off_4k & ((1 << PAGE_ADJUST) - 1))
  90                 return -EINVAL;
  91         return sys_mmap_pgoff(addr, len, prot, flags, fd,
  92                               off_4k >> PAGE_ADJUST);
  93 }
  94
  95 #ifdef __tilegx__
  96 SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
  97                 unsigned long, prot, unsigned long, flags,
  98                 unsigned long, fd, off_t, 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 #endif
 106
 107
 108 /* Provide the actual syscall number to call mapping. */
 109 #undef __SYSCALL
 110 #define __SYSCALL(nr, call) [nr] = (call),
 111
 112 #ifndef __tilegx__
 113 /* See comments at the top of the file. */
 114 #define sys_fadvise64_64 sys32_fadvise64_64
 115 #define sys_readahead sys32_readahead
 116 #endif
 117
 118 /* Call the assembly trampolines where necessary. */
 119 #undef sys_rt_sigreturn
 120 #define sys_rt_sigreturn _sys_rt_sigreturn
 121 #define sys_clone _sys_clone
 122
 123 /*
 124  * Note that we can't include <linux/unistd.h> here since the header
 125  * guard will defeat us; <asm/unistd.h> checks for __SYSCALL as well.
 126  */
 127 void *sys_call_table[__NR_syscalls] = {
 128         [0 ... __NR_syscalls-1] = sys_ni_syscall,
 129 #include <asm/unistd.h>
 130 };