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/*
* MIPS specific syscalls
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1995, 1996, 1997 by Ralf Baechle
*
* $Id: sysmips.c,v 1.6 1998/08/25 09:14:42 ralf Exp $
*/
#include <linux/errno.h>
#include <linux/linkage.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/utsname.h>
#include <asm/cachectl.h>
#include <asm/pgtable.h>
#include <asm/sysmips.h>
#include <asm/uaccess.h>
/*
* How long a hostname can we get from user space?
* -EFAULT if invalid area or too long
* 0 if ok
* >0 EFAULT after xx bytes
*/
static inline int
get_max_hostname(unsigned long address)
{
struct vm_area_struct * vma;
vma = find_vma(current->mm, address);
if (!vma || vma->vm_start > address || !(vma->vm_flags & VM_READ))
return -EFAULT;
address = vma->vm_end - address;
if (address > PAGE_SIZE)
return 0;
if (vma->vm_next && vma->vm_next->vm_start == vma->vm_end &&
(vma->vm_next->vm_flags & VM_READ))
return 0;
return address;
}
asmlinkage int
sys_sysmips(int cmd, int arg1, int arg2, int arg3)
{
int *p;
char *name;
int flags, tmp, len, retval;
lock_kernel();
switch(cmd)
{
case SETNAME:
retval = -EPERM;
if (!capable(CAP_SYS_ADMIN))
goto out;
name = (char *) arg1;
len = strlen_user(name);
retval = len;
if (len < 0)
goto out;
retval = -EINVAL;
if (len == 0 || len > __NEW_UTS_LEN)
goto out;
copy_from_user(system_utsname.nodename, name, len);
system_utsname.nodename[len] = '\0';
retval = 0;
goto out;
case MIPS_ATOMIC_SET:
/* This is broken in case of page faults and SMP ...
Risc/OS fauls after maximum 20 tries with EAGAIN. */
p = (int *) arg1;
retval = verify_area(VERIFY_WRITE, p, sizeof(*p));
if (retval)
goto out;
save_and_cli(flags);
retval = *p;
*p = arg2;
restore_flags(flags);
goto out;
case MIPS_FIXADE:
tmp = current->thread.mflags & ~3;
current->thread.mflags = tmp | (arg1 & 3);
retval = 0;
goto out;
case FLUSH_CACHE:
flush_cache_all();
retval = 0;
goto out;
case MIPS_RDNVRAM:
retval = -EIO;
goto out;
default:
retval = -EINVAL;
goto out;
}
out:
unlock_kernel();
return retval;
}
/*
* No implemented yet ...
*/
asmlinkage int
sys_cachectl(char *addr, int nbytes, int op)
{
return -ENOSYS;
}
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