LXR linux/arch/sh/kernel/sys

   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
  31asmlinkage 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
  40asmlinkage 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.  */
  57asmlinkage 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_icache_range(addr, addr+len);
  92
  93        up_read(&current->mm->mmap_sem);
  94        return 0;
  95}
  96