linux/arch/m68knommu/kernel/sys_m68k.c
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   1/*
   2 * linux/arch/m68knommu/kernel/sys_m68k.c
   3 *
   4 * This file contains various random system calls that
   5 * have a non-standard calling sequence on the Linux/m68k
   6 * platform.
   7 */
   8
   9#include <linux/errno.h>
  10#include <linux/sched.h>
  11#include <linux/mm.h>
  12#include <linux/smp.h>
  13#include <linux/sem.h>
  14#include <linux/msg.h>
  15#include <linux/shm.h>
  16#include <linux/stat.h>
  17#include <linux/syscalls.h>
  18#include <linux/mman.h>
  19#include <linux/file.h>
  20#include <linux/ipc.h>
  21#include <linux/fs.h>
  22
  23#include <asm/setup.h>
  24#include <asm/uaccess.h>
  25#include <asm/cachectl.h>
  26#include <asm/traps.h>
  27#include <asm/cacheflush.h>
  28#include <asm/unistd.h>
  29
  30/* sys_cacheflush -- flush (part of) the processor cache.  */
  31asmlinkage int
  32sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
  33{
  34        flush_cache_all();
  35        return(0);
  36}
  37
  38asmlinkage int sys_getpagesize(void)
  39{
  40        return PAGE_SIZE;
  41}
  42
  43/*
  44 * Do a system call from kernel instead of calling sys_execve so we
  45 * end up with proper pt_regs.
  46 */
  47int kernel_execve(const char *filename,
  48                  const char *const argv[],
  49                  const char *const envp[])
  50{
  51        register long __res asm ("%d0") = __NR_execve;
  52        register long __a asm ("%d1") = (long)(filename);
  53        register long __b asm ("%d2") = (long)(argv);
  54        register long __c asm ("%d3") = (long)(envp);
  55        asm volatile ("trap  #0" : "+d" (__res)
  56                        : "d" (__a), "d" (__b), "d" (__c));
  57        return __res;
  58}
  59
  60asmlinkage unsigned long sys_get_thread_area(void)
  61{
  62        return current_thread_info()->tp_value;
  63}
  64
  65asmlinkage int sys_set_thread_area(unsigned long tp)
  66{
  67        current_thread_info()->tp_value = tp;
  68        return 0;
  69}
  70
  71/* This syscall gets its arguments in A0 (mem), D2 (oldval) and
  72   D1 (newval).  */
  73asmlinkage int
  74sys_atomic_cmpxchg_32(unsigned long newval, int oldval, int d3, int d4, int d5,
  75                      unsigned long __user * mem)
  76{
  77        struct mm_struct *mm = current->mm;
  78        unsigned long mem_value;
  79
  80        down_read(&mm->mmap_sem);
  81
  82        mem_value = *mem;
  83        if (mem_value == oldval)
  84                *mem = newval;
  85
  86        up_read(&mm->mmap_sem);
  87        return mem_value;
  88}
  89
  90asmlinkage int sys_atomic_barrier(void)
  91{
  92        /* no code needed for uniprocs */
  93        return 0;
  94}
  95