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