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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 by Ralf Baechle
*/
#include <linux/errno.h>
#include <linux/linkage.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/utsname.h>
#include <asm/cachectl.h>
#include <asm/segment.h>
#include <asm/sysmips.h>
static inline size_t
strnlen_user(const char *s, size_t count)
{
return strnlen(s, count);
}
/*
* 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, 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, len, retval = -EINVAL;
switch(cmd)
{
case SETNAME:
if (!suser())
return -EPERM;
name = (char *) arg1;
len = get_max_hostname((unsigned long)name);
if (retval < 0)
return len;
len = strnlen_user(name, retval);
if (len == 0 || len > __NEW_UTS_LEN)
return -EINVAL;
memcpy_fromfs(system_utsname.nodename, name, len);
system_utsname.nodename[len] = '\0';
return 0;
case MIPS_ATOMIC_SET:
p = (int *) arg1;
retval = verify_area(VERIFY_WRITE, p, sizeof(*p));
if(retval)
return -EINVAL;
save_flags(flags);
cli();
retval = *p;
*p = arg2;
restore_flags(flags);
return retval;
case MIPS_FIXADE:
if (arg1)
current->tss.mflags |= MF_FIXADE;
else
current->tss.mflags |= MF_FIXADE;
retval = 0;
break;
case FLUSH_CACHE:
sys_cacheflush(0, ~0, BCACHE);
break;
}
return retval;
}
/*
* No implemented yet ...
*/
asmlinkage int
sys_cachectl(char *addr, int nbytes, int op)
{
return -ENOSYS;
}
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