arch/riscv/kernel/sys_riscv.c

   1 /*
   2  * Copyright (C) 2012 Regents of the University of California
   3  * Copyright (C) 2014 Darius Rad <darius@bluespec.com>
   4  * Copyright (C) 2017 SiFive
   5  *
   6  *   This program is free software; you can redistribute it and/or
   7  *   modify it under the terms of the GNU General Public License
   8  *   as published by the Free Software Foundation, version 2.
   9  *
  10  *   This program is distributed in the hope that it will be useful,
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *   GNU General Public License for more details.
  14  */
  15
  16 #include <linux/syscalls.h>
  17 #include <asm/cmpxchg.h>
  18 #include <asm/unistd.h>
  19
  20 static long riscv_sys_mmap(unsigned long addr, unsigned long len,
  21                            unsigned long prot, unsigned long flags,
  22                            unsigned long fd, off_t offset,
  23                            unsigned long page_shift_offset)
  24 {
  25         if (unlikely(offset & (~PAGE_MASK >> page_shift_offset)))
  26                 return -EINVAL;
  27         return sys_mmap_pgoff(addr, len, prot, flags, fd,
  28                               offset >> (PAGE_SHIFT - page_shift_offset));
  29 }
  30
  31 #ifdef CONFIG_64BIT
  32 SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
  33         unsigned long, prot, unsigned long, flags,
  34         unsigned long, fd, off_t, offset)
  35 {
  36         return riscv_sys_mmap(addr, len, prot, flags, fd, offset, 0);
  37 }
  38 #else
  39 SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
  40         unsigned long, prot, unsigned long, flags,
  41         unsigned long, fd, off_t, offset)
  42 {
  43         /*
  44          * Note that the shift for mmap2 is constant (12),
  45          * regardless of PAGE_SIZE
  46          */
  47         return riscv_sys_mmap(addr, len, prot, flags, fd, offset, 12);
  48 }
  49 #endif /* !CONFIG_64BIT */