arch/mips/kernel/sysmips.c

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 1 /*
 2  * MIPS specific syscalls
 3  *
 4  * This file is subject to the terms and conditions of the GNU General Public
 5  * License. See the file "COPYING" in the main directory of this archive
 6  * for more details.
 7  *
 8  * Copyright (C) 1995, 1996, 1997, 2000 by Ralf Baechle
 9  */
 10 #include <linux/errno.h>
 11 #include <linux/linkage.h>
 12 #include <linux/mm.h>
 13 #include <linux/smp.h>
 14 #include <linux/smp_lock.h>
 15 #include <linux/sched.h>
 16 #include <linux/string.h>
 17 #include <linux/utsname.h>
 18
 19 #include <asm/cachectl.h>
 20 #include <asm/pgalloc.h>
 21 #include <asm/sysmips.h>
 22 #include <asm/uaccess.h>
 23
 24 /*
 25  * How long a hostname can we get from user space?
 26  * -EFAULT if invalid area or too long
 27  * 0 if ok
 28  * >0 EFAULT after xx bytes
 29  */
 30 staticinlineint
 31 get_max_hostname(unsigned long address)
 32 {
 33 struct vm_area_struct * vma;
 34
 35  vma =find_vma(current->mm, address);
 36 if(!vma || vma->vm_start > address || !(vma->vm_flags & VM_READ))
 37 return-EFAULT;
 38  address = vma->vm_end - address;
 39 if(address > PAGE_SIZE)
 40 return0;
 41 if(vma->vm_next && vma->vm_next->vm_start == vma->vm_end &&
 42 (vma->vm_next->vm_flags & VM_READ))
 43 return0;
 44 return address;
 45 }
 46
 47 asmlinkage int
 48 sys_sysmips(int cmd,int arg1,int arg2,int arg3)
 49 {
 50 int*p;
 51 char*name;
 52 int flags, tmp, len, retval, errno;
 53
 54 switch(cmd) {
 55 case SETNAME: {
 56 char nodename[__NEW_UTS_LEN +1];
 57
 58 if(!capable(CAP_SYS_ADMIN))
 59 return-EPERM;
 60
 61  name = (char*) arg1;
 62
 63  len =strncpy_from_user(nodename, name,sizeof(nodename));
 64 if(len <0)
 65 return-EFAULT;
 66
 67 down_write(&uts_sem);
 68 strncpy(system_utsname.nodename, name, len);
 69 up_write(&uts_sem);
 70  system_utsname.nodename[len] ='\0';
 71 return0;
 72 }
 73
 74 case MIPS_ATOMIC_SET: {
 75 /* This is broken in case of page faults and SMP ...
 76  Risc/OS faults after maximum 20 tries with EAGAIN. */
 77 unsigned int tmp;
 78
 79  p = (int*) arg1;
 80  errno =verify_area(VERIFY_WRITE, p,sizeof(*p));
 81 if(errno)
 82 return errno;
 83  errno =0;
 84 save_and_cli(flags);
 85  errno |=__get_user(tmp, p);
 86  errno |=__put_user(arg2, p);
 87 restore_flags(flags);
 88
 89 if(errno)
 90 return tmp;
 91
 92 return tmp;/* This is broken ... */
 93 }
 94
 95 case MIPS_FIXADE:
 96  tmp = current->thread.mflags & ~3;
 97  current->thread.mflags = tmp | (arg1 &3);
 98  retval =0;
 99 goto out;
 100
 101 case FLUSH_CACHE:
 102 flush_cache_all();
 103  retval =0;
 104 goto out;
 105
 106 case MIPS_RDNVRAM:
 107  retval = -EIO;
 108 goto out;
 109
 110 default:
 111  retval = -EINVAL;
 112 goto out;
 113 }
 114
 115 out:
 116 return retval;
 117 }
 118
 119 /*
 120  * No implemented yet ...
 121  */
 122 asmlinkage int
 123 sys_cachectl(char*addr,int nbytes,int op)
 124 {
 125 return-ENOSYS;
 126 }
 127
 128 asmlinkage intsys_pause(void)
 129 {
 130  current->state = TASK_INTERRUPTIBLE;
 131 schedule();
 132 return-ERESTARTNOHAND;
 133 }