LXR linux/arch/nds32/kernel/sys

   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/fpu.h>
  10#include <asm/fp_udfiex_crtl.h>
  11
  12SYSCALL_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
  23SYSCALL_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
  29SYSCALL_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
  54SYSCALL_DEFINE2(fp_udfiex_crtl, unsigned int, cmd, unsigned int, act)
  55{
  56#if IS_ENABLED(CONFIG_SUPPORT_DENORMAL_ARITHMETIC)
  57        int old_udf_iex;
  58
  59        if (!used_math()) {
  60                load_fpu(&init_fpuregs);
  61                current->thread.fpu.UDF_IEX_trap = init_fpuregs.UDF_IEX_trap;
  62                set_used_math();
  63        }
  64
  65        old_udf_iex = current->thread.fpu.UDF_IEX_trap;
  66        act &= (FPCSR_mskUDFE | FPCSR_mskIEXE);
  67
  68        switch (cmd) {
  69        case DISABLE_UDF_IEX_TRAP:
  70                current->thread.fpu.UDF_IEX_trap &= ~act;
  71                break;
  72        case ENABLE_UDF_IEX_TRAP:
  73                current->thread.fpu.UDF_IEX_trap |= act;
  74                break;
  75        case GET_UDF_IEX_TRAP:
  76                break;
  77        default:
  78                return -EINVAL;
  79        }
  80        return old_udf_iex;
  81#else
  82        return -ENOTSUPP;
  83#endif
  84}
  85