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/*
* linux/arch/m68knommu/kernel/sys_m68k.c
*
* This file contains various random system calls that
* have a non-standard calling sequence on the Linux/m68k
* platform.
*/
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/stat.h>
#include <linux/syscalls.h>
#include <linux/mman.h>
#include <linux/file.h>
#include <linux/ipc.h>
#include <linux/fs.h>
#include <asm/setup.h>
#include <asm/uaccess.h>
#include <asm/cachectl.h>
#include <asm/traps.h>
#include <asm/cacheflush.h>
#include <asm/unistd.h>
/* sys_cacheflush -- flush (part of) the processor cache. */
asmlinkage int
sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
{
flush_cache_all();
return(0);
}
asmlinkage int sys_getpagesize(void)
{
return PAGE_SIZE;
}
/*
* Do a system call from kernel instead of calling sys_execve so we
* end up with proper pt_regs.
*/
int kernel_execve(const char *filename,
const char *const argv[],
const char *const envp[])
{
register long __res asm ("%d0") = __NR_execve;
register long __a asm ("%d1") = (long)(filename);
register long __b asm ("%d2") = (long)(argv);
register long __c asm ("%d3") = (long)(envp);
asm volatile ("trap #0" : "+d" (__res)
: "d" (__a), "d" (__b), "d" (__c));
return __res;
}
asmlinkage unsigned long sys_get_thread_area(void)
{
return current_thread_info()->tp_value;
}
asmlinkage int sys_set_thread_area(unsigned long tp)
{
current_thread_info()->tp_value = tp;
return 0;
}
/* This syscall gets its arguments in A0 (mem), D2 (oldval) and
D1 (newval). */
asmlinkage int
sys_atomic_cmpxchg_32(unsigned long newval, int oldval, int d3, int d4, int d5,
unsigned long __user * mem)
{
struct mm_struct *mm = current->mm;
unsigned long mem_value;
down_read(&mm->mmap_sem);
mem_value = *mem;
if (mem_value == oldval)
*mem = newval;
up_read(&mm->mmap_sem);
return mem_value;
}
asmlinkage int sys_atomic_barrier(void)
{
/* no code needed for uniprocs */
return 0;
}
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