release/src-rt-6.x.4708/linux/linux-2.6.36/arch/sh/kernel/sys_sh.c

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