LXR linux/arch/sh/kernel/sys

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * linux/arch/sh/kernel/sys_sh.c
   4 *
   5 * This file contains various random system calls that
   6 * have a non-standard calling sequence on the Linux/SuperH
   7 * platform.
   8 *
   9 * Taken from i386 version.
  10 */
  11#include <linux/errno.h>
  12#include <linux/sched.h>
  13#include <linux/mm.h>
  14#include <linux/smp.h>
  15#include <linux/sem.h>
  16#include <linux/msg.h>
  17#include <linux/shm.h>
  18#include <linux/stat.h>
  19#include <linux/syscalls.h>
  20#include <linux/mman.h>
  21#include <linux/file.h>
  22#include <linux/utsname.h>
  23#include <linux/module.h>
  24#include <linux/fs.h>
  25#include <linux/ipc.h>
  26#include <asm/syscalls.h>
  27#include <linux/uaccess.h>
  28#include <asm/unistd.h>
  29#include <asm/cacheflush.h>
  30#include <asm/cachectl.h>
  31
  32asmlinkage int old_mmap(unsigned long addr, unsigned long len,
  33        unsigned long prot, unsigned long flags,
  34        int fd, unsigned long off)
  35{
  36        if (off & ~PAGE_MASK)
  37                return -EINVAL;
  38        return ksys_mmap_pgoff(addr, len, prot, flags, fd, off>>PAGE_SHIFT);
  39}
  40
  41asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
  42        unsigned long prot, unsigned long flags,
  43        unsigned long fd, unsigned long pgoff)
  44{
  45        /*
  46         * The shift for mmap2 is constant, regardless of PAGE_SIZE
  47         * setting.
  48         */
  49        if (pgoff & ((1 << (PAGE_SHIFT - 12)) - 1))
  50                return -EINVAL;
  51
  52        pgoff >>= PAGE_SHIFT - 12;
  53
  54        return ksys_mmap_pgoff(addr, len, prot, flags, fd, pgoff);
  55}
  56
  57/* sys_cacheflush -- flush (part of) the processor cache.  */
  58asmlinkage int sys_cacheflush(unsigned long addr, unsigned long len, int op)
  59{
  60        struct vm_area_struct *vma;
  61
  62        if ((op <= 0) || (op > (CACHEFLUSH_D_PURGE|CACHEFLUSH_I)))
  63                return -EINVAL;
  64
  65        /*
  66         * Verify that the specified address region actually belongs
  67         * to this process.
  68         */
  69        if (addr + len < addr)
  70                return -EFAULT;
  71
  72        down_read(&current->mm->mmap_sem);
  73        vma = find_vma (current->mm, addr);
  74        if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end) {
  75                up_read(&current->mm->mmap_sem);
  76                return -EFAULT;
  77        }
  78
  79        switch (op & CACHEFLUSH_D_PURGE) {
  80                case CACHEFLUSH_D_INVAL:
  81                        __flush_invalidate_region((void *)addr, len);
  82                        break;
  83                case CACHEFLUSH_D_WB:
  84                        __flush_wback_region((void *)addr, len);
  85                        break;
  86                case CACHEFLUSH_D_PURGE:
  87                        __flush_purge_region((void *)addr, len);
  88                        break;
  89        }
  90
  91        if (op & CACHEFLUSH_I)
  92                flush_icache_range(addr, addr+len);
  93
  94        up_read(&current->mm->mmap_sem);
  95        return 0;
  96}
  97