| 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. */ |
| 31 | asmlinkage int |
| 32 | sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len) |
| 33 | { |
| 34 | flush_cache_all(); |
| 35 | return(0); |
| 36 | } |
| 37 | |
| 38 | asmlinkage 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 | */ |
| 47 | int kernel_execve(const char *filename, char *const argv[], char *const envp[]) |
| 48 | { |
| 49 | register long __res asm ("%d0") = __NR_execve; |
| 50 | register long __a asm ("%d1") = (long)(filename); |
| 51 | register long __b asm ("%d2") = (long)(argv); |
| 52 | register long __c asm ("%d3") = (long)(envp); |
| 53 | asm volatile ("trap #0" : "+d" (__res) |
| 54 | : "d" (__a), "d" (__b), "d" (__c)); |
| 55 | return __res; |
| 56 | } |
| 57 | |
| 58 | asmlinkage unsigned long sys_get_thread_area(void) |
| 59 | { |
| 60 | return current_thread_info()->tp_value; |
| 61 | } |
| 62 | |
| 63 | asmlinkage int sys_set_thread_area(unsigned long tp) |
| 64 | { |
| 65 | current_thread_info()->tp_value = tp; |
| 66 | return 0; |
| 67 | } |
| 68 | |
| 69 | /* This syscall gets its arguments in A0 (mem), D2 (oldval) and |
| 70 | D1 (newval). */ |
| 71 | asmlinkage int |
| 72 | sys_atomic_cmpxchg_32(unsigned long newval, int oldval, int d3, int d4, int d5, |
| 73 | unsigned long __user * mem) |
| 74 | { |
| 75 | struct mm_struct *mm = current->mm; |
| 76 | unsigned long mem_value; |
| 77 | |
| 78 | down_read(&mm->mmap_sem); |
| 79 | |
| 80 | mem_value = *mem; |
| 81 | if (mem_value == oldval) |
| 82 | *mem = newval; |
| 83 | |
| 84 | up_read(&mm->mmap_sem); |
| 85 | return mem_value; |
| 86 | } |
| 87 | |
| 88 | asmlinkage int sys_atomic_barrier(void) |
| 89 | { |
| 90 | /* no code needed for uniprocs */ |
| 91 | return 0; |
| 92 | } |