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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/cache.h>
#include <asm/ipc.h>
#include <asm/uaccess.h>
#include <asm/sysmips.h>
static inline size_t
strnlen_user(const char *s, size_t count)
{
return strnlen(s, count);
}
asmlinkage int
sys_sysmips(int cmd, int arg1, int arg2, int arg3)
{
int *p;
char *name;
int flags, tmp, len, retval;
switch(cmd)
{
case SETNAME:
if (!suser())
return -EPERM;
name = (char *) arg1;
len = strnlen_user(name, retval);
if (len < 0)
retval = len;
break;
if (len == 0 || len > __NEW_UTS_LEN)
retval = -EINVAL;
break;
copy_from_user(system_utsname.nodename, name, len);
system_utsname.nodename[len] = '\0';
return 0;
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)
return retval;
save_flags(flags);
cli();
retval = *p;
*p = arg2;
restore_flags(flags);
break;
case MIPS_FIXADE:
tmp = current->tss.mflags & ~3;
current->tss.mflags = tmp | (arg1 & 3);
retval = 0;
break;
case FLUSH_CACHE:
cacheflush(0, ~0, CF_BCACHE|CF_ALL);
break;
case MIPS_RDNVRAM:
retval = -EIO;
break;
default:
retval = -EINVAL;
break;
}
return retval;
}
asmlinkage int
sys_cacheflush(void *addr, int nbytes, int cache)
{
unsigned int rw;
int ok;
if ((cache & ~(DCACHE | ICACHE)) != 0)
return -EINVAL;
rw = (cache & DCACHE) ? VERIFY_WRITE : VERIFY_READ;
if (!access_ok(rw, addr, nbytes))
return -EFAULT;
cacheflush((unsigned long)addr, (unsigned long)nbytes, cache|CF_ALL);
return 0;
}
/*
* No implemented yet ...
*/
asmlinkage int
sys_cachectl(char *addr, int nbytes, int op)
{
return -ENOSYS;
}
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