2 * linux/arch/m68k/kernel/sys_m68k.c
4 * This file contains various random system calls that
5 * have a non-standard calling sequence on the Linux/m68k
9 #include <linux/capability.h>
10 #include <linux/errno.h>
11 #include <linux/sched.h>
14 #include <linux/smp.h>
15 #include <linux/smp_lock.h>
16 #include <linux/sem.h>
17 #include <linux/msg.h>
18 #include <linux/shm.h>
19 #include <linux/stat.h>
20 #include <linux/syscalls.h>
21 #include <linux/mman.h>
22 #include <linux/file.h>
23 #include <linux/ipc.h>
25 #include <asm/setup.h>
26 #include <asm/uaccess.h>
27 #include <asm/cachectl.h>
28 #include <asm/traps.h>
30 #include <asm/unistd.h>
32 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
33 unsigned long prot, unsigned long flags,
34 unsigned long fd, unsigned long pgoff)
37 * This is wrong for sun3 - there PAGE_SIZE is 8Kb,
38 * so we need to shift the argument down by 1; m68k mmap64(3)
39 * (in libc) expects the last argument of mmap2 in 4Kb units.
41 return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff);
45 * Perform the select(nd, in, out, ex, tv) and mmap() system
46 * calls. Linux/m68k cloned Linux/i386, which didn't use to be able to
47 * handle more than 4 system call parameters, so these system calls
48 * used a memory block for parameter passing..
51 struct mmap_arg_struct {
60 asmlinkage int old_mmap(struct mmap_arg_struct __user *arg)
62 struct mmap_arg_struct a;
65 if (copy_from_user(&a, arg, sizeof(a)))
69 if (a.offset & ~PAGE_MASK)
72 error = sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
73 a.offset >> PAGE_SHIFT);
78 struct sel_arg_struct {
80 fd_set __user *inp, *outp, *exp;
81 struct timeval __user *tvp;
84 asmlinkage int old_select(struct sel_arg_struct __user *arg)
86 struct sel_arg_struct a;
88 if (copy_from_user(&a, arg, sizeof(a)))
90 /* sys_select() does the appropriate kernel locking */
91 return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
95 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
97 * This is really horribly ugly.
99 asmlinkage int sys_ipc (uint call, int first, int second,
100 int third, void __user *ptr, long fifth)
104 version = call >> 16; /* hack for backward compatibility */
110 return sys_semop (first, ptr, second);
112 return sys_semget (first, second, third);
117 if (get_user(fourth.__pad, (void __user *__user *) ptr))
119 return sys_semctl (first, second, third, fourth);
127 return sys_msgsnd (first, ptr, second, third);
131 struct ipc_kludge tmp;
134 if (copy_from_user (&tmp, ptr, sizeof (tmp)))
136 return sys_msgrcv (first, tmp.msgp, second,
140 return sys_msgrcv (first, ptr,
141 second, fifth, third);
144 return sys_msgget ((key_t) first, second);
146 return sys_msgctl (first, second, ptr);
156 ret = do_shmat (first, ptr, second, &raddr);
159 return put_user (raddr, (ulong __user *) third);
163 return sys_shmdt (ptr);
165 return sys_shmget (first, second, third);
167 return sys_shmctl (first, second, ptr);
175 /* Convert virtual (user) address VADDR to physical address PADDR */
176 #define virt_to_phys_040(vaddr) \
178 unsigned long _mmusr, _paddr; \
180 __asm__ __volatile__ (".chip 68040\n\t" \
182 "movec %%mmusr,%0\n\t" \
186 _paddr = (_mmusr & MMU_R_040) ? (_mmusr & PAGE_MASK) : 0; \
191 cache_flush_040 (unsigned long addr, int scope, int cache, unsigned long len)
193 unsigned long paddr, i;
197 case FLUSH_SCOPE_ALL:
200 case FLUSH_CACHE_DATA:
201 /* This nop is needed for some broken versions of the 68040. */
202 __asm__ __volatile__ ("nop\n\t"
207 case FLUSH_CACHE_INSN:
208 __asm__ __volatile__ ("nop\n\t"
214 case FLUSH_CACHE_BOTH:
215 __asm__ __volatile__ ("nop\n\t"
223 case FLUSH_SCOPE_LINE:
224 /* Find the physical address of the first mapped page in the
226 if ((paddr = virt_to_phys_040(addr))) {
227 paddr += addr & ~(PAGE_MASK | 15);
228 len = (len + (addr & 15) + 15) >> 4;
230 unsigned long tmp = PAGE_SIZE - (addr & ~PAGE_MASK);
239 if ((paddr = virt_to_phys_040(addr)))
246 len = (len + 15) >> 4;
248 i = (PAGE_SIZE - (paddr & ~PAGE_MASK)) >> 4;
253 case FLUSH_CACHE_DATA:
254 __asm__ __volatile__ ("nop\n\t"
256 "cpushl %%dc,(%0)\n\t"
260 case FLUSH_CACHE_INSN:
261 __asm__ __volatile__ ("nop\n\t"
263 "cpushl %%ic,(%0)\n\t"
268 case FLUSH_CACHE_BOTH:
269 __asm__ __volatile__ ("nop\n\t"
271 "cpushl %%bc,(%0)\n\t"
279 * No need to page align here since it is done by
280 * virt_to_phys_040().
284 /* Recompute physical address when crossing a page
288 if ((paddr = virt_to_phys_040(addr)))
302 case FLUSH_SCOPE_PAGE:
303 len += (addr & ~PAGE_MASK) + (PAGE_SIZE - 1);
304 for (len >>= PAGE_SHIFT; len--; addr += PAGE_SIZE)
306 if (!(paddr = virt_to_phys_040(addr)))
310 case FLUSH_CACHE_DATA:
311 __asm__ __volatile__ ("nop\n\t"
313 "cpushp %%dc,(%0)\n\t"
317 case FLUSH_CACHE_INSN:
318 __asm__ __volatile__ ("nop\n\t"
320 "cpushp %%ic,(%0)\n\t"
325 case FLUSH_CACHE_BOTH:
326 __asm__ __volatile__ ("nop\n\t"
328 "cpushp %%bc,(%0)\n\t"
339 #define virt_to_phys_060(vaddr) \
341 unsigned long paddr; \
342 __asm__ __volatile__ (".chip 68060\n\t" \
351 cache_flush_060 (unsigned long addr, int scope, int cache, unsigned long len)
353 unsigned long paddr, i;
357 * cpush %dc : flush DC, remains valid (with our %cacr setup)
358 * cpush %ic : invalidate IC
359 * cpush %bc : flush DC + invalidate IC
363 case FLUSH_SCOPE_ALL:
366 case FLUSH_CACHE_DATA:
367 __asm__ __volatile__ (".chip 68060\n\t"
371 case FLUSH_CACHE_INSN:
372 __asm__ __volatile__ (".chip 68060\n\t"
377 case FLUSH_CACHE_BOTH:
378 __asm__ __volatile__ (".chip 68060\n\t"
385 case FLUSH_SCOPE_LINE:
386 /* Find the physical address of the first mapped page in the
390 if (!(paddr = virt_to_phys_060(addr))) {
391 unsigned long tmp = PAGE_SIZE - (addr & ~PAGE_MASK);
400 if ((paddr = virt_to_phys_060(addr)))
408 len = (len + 15) >> 4;
409 i = (PAGE_SIZE - (paddr & ~PAGE_MASK)) >> 4;
414 case FLUSH_CACHE_DATA:
415 __asm__ __volatile__ (".chip 68060\n\t"
416 "cpushl %%dc,(%0)\n\t"
420 case FLUSH_CACHE_INSN:
421 __asm__ __volatile__ (".chip 68060\n\t"
422 "cpushl %%ic,(%0)\n\t"
427 case FLUSH_CACHE_BOTH:
428 __asm__ __volatile__ (".chip 68060\n\t"
429 "cpushl %%bc,(%0)\n\t"
438 * We just want to jump to the first cache line
445 /* Recompute physical address when crossing a page
449 if ((paddr = virt_to_phys_060(addr)))
463 case FLUSH_SCOPE_PAGE:
464 len += (addr & ~PAGE_MASK) + (PAGE_SIZE - 1);
465 addr &= PAGE_MASK; /* Workaround for bug in some
466 revisions of the 68060 */
467 for (len >>= PAGE_SHIFT; len--; addr += PAGE_SIZE)
469 if (!(paddr = virt_to_phys_060(addr)))
473 case FLUSH_CACHE_DATA:
474 __asm__ __volatile__ (".chip 68060\n\t"
475 "cpushp %%dc,(%0)\n\t"
479 case FLUSH_CACHE_INSN:
480 __asm__ __volatile__ (".chip 68060\n\t"
481 "cpushp %%ic,(%0)\n\t"
486 case FLUSH_CACHE_BOTH:
487 __asm__ __volatile__ (".chip 68060\n\t"
488 "cpushp %%bc,(%0)\n\t"
499 /* sys_cacheflush -- flush (part of) the processor cache. */
501 sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
503 struct vm_area_struct *vma;
507 if (scope < FLUSH_SCOPE_LINE || scope > FLUSH_SCOPE_ALL ||
508 cache & ~FLUSH_CACHE_BOTH)
511 if (scope == FLUSH_SCOPE_ALL) {
512 /* Only the superuser may explicitly flush the whole cache. */
514 if (!capable(CAP_SYS_ADMIN))
518 * Verify that the specified address region actually belongs
521 vma = find_vma (current->mm, addr);
523 /* Check for overflow. */
524 if (addr + len < addr)
526 if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end)
530 if (CPU_IS_020_OR_030) {
531 if (scope == FLUSH_SCOPE_LINE && len < 256) {
533 __asm__ ("movec %%cacr, %0" : "=r" (cacr));
534 if (cache & FLUSH_CACHE_INSN)
536 if (cache & FLUSH_CACHE_DATA)
540 __asm__ __volatile__ ("movec %1, %%caar\n\t"
543 : "r" (cacr), "r" (addr));
547 /* Flush the whole cache, even if page granularity requested. */
549 __asm__ ("movec %%cacr, %0" : "=r" (cacr));
550 if (cache & FLUSH_CACHE_INSN)
552 if (cache & FLUSH_CACHE_DATA)
554 __asm__ __volatile__ ("movec %0, %%cacr" : : "r" (cacr));
560 * 040 or 060: don't blindly trust 'scope', someone could
561 * try to flush a few megs of memory.
564 if (len>=3*PAGE_SIZE && scope<FLUSH_SCOPE_PAGE)
565 scope=FLUSH_SCOPE_PAGE;
566 if (len>=10*PAGE_SIZE && scope<FLUSH_SCOPE_ALL)
567 scope=FLUSH_SCOPE_ALL;
569 ret = cache_flush_040 (addr, scope, cache, len);
570 } else if (CPU_IS_060) {
571 ret = cache_flush_060 (addr, scope, cache, len);
579 asmlinkage int sys_getpagesize(void)
585 * Do a system call from kernel instead of calling sys_execve so we
586 * end up with proper pt_regs.
588 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
590 register long __res asm ("%d0") = __NR_execve;
591 register long __a asm ("%d1") = (long)(filename);
592 register long __b asm ("%d2") = (long)(argv);
593 register long __c asm ("%d3") = (long)(envp);
594 asm volatile ("trap #0" : "+d" (__res)
595 : "d" (__a), "d" (__b), "d" (__c));