arch/nds32/kernel/sys_nds32.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (C) 2005-2017 Andes Technology Corporation
   3
   4 #include <linux/syscalls.h>
   5 #include <linux/uaccess.h>
   6
   7 #include <asm/cachectl.h>
   8 #include <asm/proc-fns.h>
   9 #include <asm/udftrap.h>
  10 #include <asm/fpu.h>
  11
  12 SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
  13                unsigned long, prot, unsigned long, flags,
  14                unsigned long, fd, unsigned long, pgoff)
  15 {
  16         if (pgoff & (~PAGE_MASK >> 12))
  17                 return -EINVAL;
  18
  19         return sys_mmap_pgoff(addr, len, prot, flags, fd,
  20                               pgoff >> (PAGE_SHIFT - 12));
  21 }
  22
  23 SYSCALL_DEFINE4(fadvise64_64_wrapper,int, fd, int, advice, loff_t, offset,
  24                                          loff_t, len)
  25 {
  26         return sys_fadvise64_64(fd, offset, len, advice);
  27 }
  28
  29 SYSCALL_DEFINE3(cacheflush, unsigned int, start, unsigned int, end, int, cache)
  30 {
  31         struct vm_area_struct *vma;
  32         bool flushi = true, wbd = true;
  33
  34         vma = find_vma(current->mm, start);
  35         if (!vma)
  36                 return -EFAULT;
  37         switch (cache) {
  38         case ICACHE:
  39                 wbd = false;
  40                 break;
  41         case DCACHE:
  42                 flushi = false;
  43                 break;
  44         case BCACHE:
  45                 break;
  46         default:
  47                 return -EINVAL;
  48         }
  49         cpu_cache_wbinval_range_check(vma, start, end, flushi, wbd);
  50
  51         return 0;
  52 }
  53
  54 SYSCALL_DEFINE1(udftrap, int, option)
  55 {
  56 #if IS_ENABLED(CONFIG_SUPPORT_DENORMAL_ARITHMETIC)
  57         int old_udftrap;
  58
  59         if (!used_math()) {
  60                 load_fpu(&init_fpuregs);
  61                 current->thread.fpu.UDF_trap = init_fpuregs.UDF_trap;
  62                 set_used_math();
  63         }
  64
  65         old_udftrap = current->thread.fpu.UDF_trap;
  66         switch (option) {
  67         case DISABLE_UDFTRAP:
  68                 current->thread.fpu.UDF_trap = 0;
  69                 break;
  70         case ENABLE_UDFTRAP:
  71                 current->thread.fpu.UDF_trap = FPCSR_mskUDFE;
  72                 break;
  73         case GET_UDFTRAP:
  74                 break;
  75         default:
  76                 return -EINVAL;
  77         }
  78         return old_udftrap;
  79 #else
  80         return -ENOTSUPP;
  81 #endif
  82 }