root/arch/sh/kernel/sys_sh.c

DEFINITIONS

1. old_mmap
2. sys_mmap2
3. sys_cacheflush

   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 
  32 asmlinkage 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 
  41 asmlinkage 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.  */
  58 asmlinkage 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 }