arch/m68k/kernel/sys_m68k.c - linux - Git at Google

 /*
  * linux/arch/m68k/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/capability.h>
 #include <linux/errno.h>
 #include <linux/sched.h>
 #include <linux/mm.h>
 #include <linux/fs.h>
 #include <linux/smp.h>
 #include <linux/smp_lock.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 <asm/setup.h>
 #include <asm/uaccess.h>
 #include <asm/cachectl.h>
 #include <asm/traps.h>
 #include <asm/page.h>
 #include <asm/unistd.h>
 #include <linux/elf.h>
 #include <asm/tlb.h>

 asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
 			     unsigned long error_code);

 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
 	unsigned long prot, unsigned long flags,
 	unsigned long fd, unsigned long pgoff)
 {
 	/*
 	 * This is wrong for sun3 - there PAGE_SIZE is 8Kb,
 	 * so we need to shift the argument down by 1; m68k mmap64(3)
 	 * (in libc) expects the last argument of mmap2 in 4Kb units.
 	 */
 	return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff);
 }

 /* Convert virtual (user) address VADDR to physical address PADDR */
 #define virt_to_phys_040(vaddr)						\
 ({									\
   unsigned long _mmusr, _paddr;						\
 									\
   __asm__ __volatile__ (".chip 68040\n\t"				\
 			"ptestr (%1)\n\t"				\
 			"movec %%mmusr,%0\n\t"				\
 			".chip 68k"					\
 			: "=r" (_mmusr)					\
 			: "a" (vaddr));					\
   _paddr = (_mmusr & MMU_R_040) ? (_mmusr & PAGE_MASK) : 0;		\
   _paddr;								\
 })

 static inline int
 cache_flush_040 (unsigned long addr, int scope, int cache, unsigned long len)
 {
   unsigned long paddr, i;

   switch (scope)
     {
     case FLUSH_SCOPE_ALL:
       switch (cache)
 	{
 	case FLUSH_CACHE_DATA:
 	  /* This nop is needed for some broken versions of the 68040.  */
 	  __asm__ __volatile__ ("nop\n\t"
 				".chip 68040\n\t"
 				"cpusha %dc\n\t"
 				".chip 68k");
 	  break;
 	case FLUSH_CACHE_INSN:
 	  __asm__ __volatile__ ("nop\n\t"
 				".chip 68040\n\t"
 				"cpusha %ic\n\t"
 				".chip 68k");
 	  break;
 	default:
 	case FLUSH_CACHE_BOTH:
 	  __asm__ __volatile__ ("nop\n\t"
 				".chip 68040\n\t"
 				"cpusha %bc\n\t"
 				".chip 68k");
 	  break;
 	}
       break;

     case FLUSH_SCOPE_LINE:
       /* Find the physical address of the first mapped page in the
 	 address range.  */
       if ((paddr = virt_to_phys_040(addr))) {
         paddr += addr & ~(PAGE_MASK | 15);
         len = (len + (addr & 15) + 15) >> 4;
       } else {
 	unsigned long tmp = PAGE_SIZE - (addr & ~PAGE_MASK);

 	if (len <= tmp)
 	  return 0;
 	addr += tmp;
 	len -= tmp;
 	tmp = PAGE_SIZE;
 	for (;;)
 	  {
 	    if ((paddr = virt_to_phys_040(addr)))
 	      break;
 	    if (len <= tmp)
 	      return 0;
 	    addr += tmp;
 	    len -= tmp;
 	  }
 	len = (len + 15) >> 4;
       }
       i = (PAGE_SIZE - (paddr & ~PAGE_MASK)) >> 4;
       while (len--)
 	{
 	  switch (cache)
 	    {
 	    case FLUSH_CACHE_DATA:
 	      __asm__ __volatile__ ("nop\n\t"
 				    ".chip 68040\n\t"
 				    "cpushl %%dc,(%0)\n\t"
 				    ".chip 68k"
 				    : : "a" (paddr));
 	      break;
 	    case FLUSH_CACHE_INSN:
 	      __asm__ __volatile__ ("nop\n\t"
 				    ".chip 68040\n\t"
 				    "cpushl %%ic,(%0)\n\t"
 				    ".chip 68k"
 				    : : "a" (paddr));
 	      break;
 	    default:
 	    case FLUSH_CACHE_BOTH:
 	      __asm__ __volatile__ ("nop\n\t"
 				    ".chip 68040\n\t"
 				    "cpushl %%bc,(%0)\n\t"
 				    ".chip 68k"
 				    : : "a" (paddr));
 	      break;
 	    }
 	  if (!--i && len)
 	    {
 	      /*
 	       * No need to page align here since it is done by
 	       * virt_to_phys_040().
 	       */
 	      addr += PAGE_SIZE;
 	      i = PAGE_SIZE / 16;
 	      /* Recompute physical address when crossing a page
 	         boundary. */
 	      for (;;)
 		{
 		  if ((paddr = virt_to_phys_040(addr)))
 		    break;
 		  if (len <= i)
 		    return 0;
 		  len -= i;
 		  addr += PAGE_SIZE;
 		}
 	    }
 	  else
 	    paddr += 16;
 	}
       break;

     default:
     case FLUSH_SCOPE_PAGE:
       len += (addr & ~PAGE_MASK) + (PAGE_SIZE - 1);
       for (len >>= PAGE_SHIFT; len--; addr += PAGE_SIZE)
 	{
 	  if (!(paddr = virt_to_phys_040(addr)))
 	    continue;
 	  switch (cache)
 	    {
 	    case FLUSH_CACHE_DATA:
 	      __asm__ __volatile__ ("nop\n\t"
 				    ".chip 68040\n\t"
 				    "cpushp %%dc,(%0)\n\t"
 				    ".chip 68k"
 				    : : "a" (paddr));
 	      break;
 	    case FLUSH_CACHE_INSN:
 	      __asm__ __volatile__ ("nop\n\t"
 				    ".chip 68040\n\t"
 				    "cpushp %%ic,(%0)\n\t"
 				    ".chip 68k"
 				    : : "a" (paddr));
 	      break;
 	    default:
 	    case FLUSH_CACHE_BOTH:
 	      __asm__ __volatile__ ("nop\n\t"
 				    ".chip 68040\n\t"
 				    "cpushp %%bc,(%0)\n\t"
 				    ".chip 68k"
 				    : : "a" (paddr));
 	      break;
 	    }
 	}
       break;
     }
   return 0;
 }

 #define virt_to_phys_060(vaddr)				\
 ({							\
   unsigned long paddr;					\
   __asm__ __volatile__ (".chip 68060\n\t"		\
 			"plpar (%0)\n\t"		\
 			".chip 68k"			\
 			: "=a" (paddr)			\
 			: "0" (vaddr));			\
   (paddr); /* XXX */					\
 })

 static inline int
 cache_flush_060 (unsigned long addr, int scope, int cache, unsigned long len)
 {
   unsigned long paddr, i;

   /*
    * 68060 manual says:
    *  cpush %dc : flush DC, remains valid (with our %cacr setup)
    *  cpush %ic : invalidate IC
    *  cpush %bc : flush DC + invalidate IC
    */
   switch (scope)
     {
     case FLUSH_SCOPE_ALL:
       switch (cache)
 	{
 	case FLUSH_CACHE_DATA:
 	  __asm__ __volatile__ (".chip 68060\n\t"
 				"cpusha %dc\n\t"
 				".chip 68k");
 	  break;
 	case FLUSH_CACHE_INSN:
 	  __asm__ __volatile__ (".chip 68060\n\t"
 				"cpusha %ic\n\t"
 				".chip 68k");
 	  break;
 	default:
 	case FLUSH_CACHE_BOTH:
 	  __asm__ __volatile__ (".chip 68060\n\t"
 				"cpusha %bc\n\t"
 				".chip 68k");
 	  break;
 	}
       break;

     case FLUSH_SCOPE_LINE:
       /* Find the physical address of the first mapped page in the
 	 address range.  */
       len += addr & 15;
       addr &= -16;
       if (!(paddr = virt_to_phys_060(addr))) {
 	unsigned long tmp = PAGE_SIZE - (addr & ~PAGE_MASK);

 	if (len <= tmp)
 	  return 0;
 	addr += tmp;
 	len -= tmp;
 	tmp = PAGE_SIZE;
 	for (;;)
 	  {
 	    if ((paddr = virt_to_phys_060(addr)))
 	      break;
 	    if (len <= tmp)
 	      return 0;
 	    addr += tmp;
 	    len -= tmp;
 	  }
       }
       len = (len + 15) >> 4;
       i = (PAGE_SIZE - (paddr & ~PAGE_MASK)) >> 4;
       while (len--)
 	{
 	  switch (cache)
 	    {
 	    case FLUSH_CACHE_DATA:
 	      __asm__ __volatile__ (".chip 68060\n\t"
 				    "cpushl %%dc,(%0)\n\t"
 				    ".chip 68k"
 				    : : "a" (paddr));
 	      break;
 	    case FLUSH_CACHE_INSN:
 	      __asm__ __volatile__ (".chip 68060\n\t"
 				    "cpushl %%ic,(%0)\n\t"
 				    ".chip 68k"
 				    : : "a" (paddr));
 	      break;
 	    default:
 	    case FLUSH_CACHE_BOTH:
 	      __asm__ __volatile__ (".chip 68060\n\t"
 				    "cpushl %%bc,(%0)\n\t"
 				    ".chip 68k"
 				    : : "a" (paddr));
 	      break;
 	    }
 	  if (!--i && len)
 	    {

 	      /*
 	       * We just want to jump to the first cache line
 	       * in the next page.
 	       */
 	      addr += PAGE_SIZE;
 	      addr &= PAGE_MASK;

 	      i = PAGE_SIZE / 16;
 	      /* Recompute physical address when crossing a page
 	         boundary. */
 	      for (;;)
 	        {
 	          if ((paddr = virt_to_phys_060(addr)))
 	            break;
 	          if (len <= i)
 	            return 0;
 	          len -= i;
 	          addr += PAGE_SIZE;
 	        }
 	    }
 	  else
 	    paddr += 16;
 	}
       break;

     default:
     case FLUSH_SCOPE_PAGE:
       len += (addr & ~PAGE_MASK) + (PAGE_SIZE - 1);
       addr &= PAGE_MASK;	/* Workaround for bug in some
 				   revisions of the 68060 */
       for (len >>= PAGE_SHIFT; len--; addr += PAGE_SIZE)
 	{
 	  if (!(paddr = virt_to_phys_060(addr)))
 	    continue;
 	  switch (cache)
 	    {
 	    case FLUSH_CACHE_DATA:
 	      __asm__ __volatile__ (".chip 68060\n\t"
 				    "cpushp %%dc,(%0)\n\t"
 				    ".chip 68k"
 				    : : "a" (paddr));
 	      break;
 	    case FLUSH_CACHE_INSN:
 	      __asm__ __volatile__ (".chip 68060\n\t"
 				    "cpushp %%ic,(%0)\n\t"
 				    ".chip 68k"
 				    : : "a" (paddr));
 	      break;
 	    default:
 	    case FLUSH_CACHE_BOTH:
 	      __asm__ __volatile__ (".chip 68060\n\t"
 				    "cpushp %%bc,(%0)\n\t"
 				    ".chip 68k"
 				    : : "a" (paddr));
 	      break;
 	    }
 	}
       break;
     }
   return 0;
 }

 /* sys_cacheflush -- flush (part of) the processor cache.  */
 asmlinkage int
 sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
 {
 	struct vm_area_struct *vma;
 	int ret = -EINVAL;

 	lock_kernel();
 	if (scope < FLUSH_SCOPE_LINE || scope > FLUSH_SCOPE_ALL ||
 	    cache & ~FLUSH_CACHE_BOTH)
 		goto out;

 	if (scope == FLUSH_SCOPE_ALL) {
 		/* Only the superuser may explicitly flush the whole cache. */
 		ret = -EPERM;
 		if (!capable(CAP_SYS_ADMIN))
 			goto out;
 	} else {
 		/*
 		 * Verify that the specified address region actually belongs
 		 * to this process.
 		 */
 		vma = find_vma (current->mm, addr);
 		ret = -EINVAL;
 		/* Check for overflow.  */
 		if (addr + len < addr)
 			goto out;
 		if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end)
 			goto out;
 	}

 	if (CPU_IS_020_OR_030) {
 		if (scope == FLUSH_SCOPE_LINE && len < 256) {
 			unsigned long cacr;
 			__asm__ ("movec %%cacr, %0" : "=r" (cacr));
 			if (cache & FLUSH_CACHE_INSN)
 				cacr |= 4;
 			if (cache & FLUSH_CACHE_DATA)
 				cacr |= 0x400;
 			len >>= 2;
 			while (len--) {
 				__asm__ __volatile__ ("movec %1, %%caar\n\t"
 						      "movec %0, %%cacr"
 						      : /* no outputs */
 						      : "r" (cacr), "r" (addr));
 				addr += 4;
 			}
 		} else {
 			/* Flush the whole cache, even if page granularity requested. */
 			unsigned long cacr;
 			__asm__ ("movec %%cacr, %0" : "=r" (cacr));
 			if (cache & FLUSH_CACHE_INSN)
 				cacr |= 8;
 			if (cache & FLUSH_CACHE_DATA)
 				cacr |= 0x800;
 			__asm__ __volatile__ ("movec %0, %%cacr" : : "r" (cacr));
 		}
 		ret = 0;
 		goto out;
 	} else {
 	    /*
 	     * 040 or 060: don't blindly trust 'scope', someone could
 	     * try to flush a few megs of memory.
 	     */

 	    if (len>=3*PAGE_SIZE && scope<FLUSH_SCOPE_PAGE)
 	        scope=FLUSH_SCOPE_PAGE;
 	    if (len>=10*PAGE_SIZE && scope<FLUSH_SCOPE_ALL)
 	        scope=FLUSH_SCOPE_ALL;
 	    if (CPU_IS_040) {
 		ret = cache_flush_040 (addr, scope, cache, len);
 	    } else if (CPU_IS_060) {
 		ret = cache_flush_060 (addr, scope, cache, len);
 	    }
 	}
 out:
 	unlock_kernel();
 	return ret;
 }

 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, char *const argv[], 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)
 {
 	/* This was borrowed from ARM's implementation.  */
 	for (;;) {
 		struct mm_struct *mm = current->mm;
 		pgd_t *pgd;
 		pmd_t *pmd;
 		pte_t *pte;
 		spinlock_t *ptl;
 		unsigned long mem_value;

 		down_read(&mm->mmap_sem);
 		pgd = pgd_offset(mm, (unsigned long)mem);
 		if (!pgd_present(*pgd))
 			goto bad_access;
 		pmd = pmd_offset(pgd, (unsigned long)mem);
 		if (!pmd_present(*pmd))
 			goto bad_access;
 		pte = pte_offset_map_lock(mm, pmd, (unsigned long)mem, &ptl);
 		if (!pte_present(*pte) || !pte_dirty(*pte)
 		    || !pte_write(*pte)) {
 			pte_unmap_unlock(pte, ptl);
 			goto bad_access;
 		}

 		mem_value = *mem;
 		if (mem_value == oldval)
 			*mem = newval;

 		pte_unmap_unlock(pte, ptl);
 		up_read(&mm->mmap_sem);
 		return mem_value;

 	      bad_access:
 		up_read(&mm->mmap_sem);
 		/* This is not necessarily a bad access, we can get here if
 		   a memory we're trying to write to should be copied-on-write.
 		   Make the kernel do the necessary page stuff, then re-iterate.
 		   Simulate a write access fault to do that.  */
 		{
 			/* The first argument of the function corresponds to
 			   D1, which is the first field of struct pt_regs.  */
 			struct pt_regs *fp = (struct pt_regs *)&newval;

 			/* '3' is an RMW flag.  */
 			if (do_page_fault(fp, (unsigned long)mem, 3))
 				/* If the do_page_fault() failed, we don't
 				   have anything meaningful to return.
 				   There should be a SIGSEGV pending for
 				   the process.  */
 				return 0xdeadbeef;
 		}
 	}
 }

 asmlinkage int sys_atomic_barrier(void)
 {
 	/* no code needed for uniprocs */
 	return 0;
 }
	/*
	* linux/arch/m68k/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/capability.h>
	#include <linux/errno.h>
	#include <linux/sched.h>
	#include <linux/mm.h>
	#include <linux/fs.h>
	#include <linux/smp.h>
	#include <linux/smp_lock.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 <asm/setup.h>
	#include <asm/uaccess.h>
	#include <asm/cachectl.h>
	#include <asm/traps.h>
	#include <asm/page.h>
	#include <asm/unistd.h>
	#include <linux/elf.h>
	#include <asm/tlb.h>

	asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
	unsigned long error_code);

	asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
	unsigned long prot, unsigned long flags,
	unsigned long fd, unsigned long pgoff)
	{
	/*
	* This is wrong for sun3 - there PAGE_SIZE is 8Kb,
	* so we need to shift the argument down by 1; m68k mmap64(3)
	* (in libc) expects the last argument of mmap2 in 4Kb units.
	*/
	return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff);
	}

	/* Convert virtual (user) address VADDR to physical address PADDR */
	#define virt_to_phys_040(vaddr) \
	({ \
	unsigned long _mmusr, _paddr; \
	\
	__asm__ __volatile__ (".chip 68040\n\t" \
	"ptestr (%1)\n\t" \
	"movec %%mmusr,%0\n\t" \
	".chip 68k" \
	: "=r" (_mmusr) \
	: "a" (vaddr)); \
	_paddr = (_mmusr & MMU_R_040) ? (_mmusr & PAGE_MASK) : 0; \
	_paddr; \
	})

	static inline int
	cache_flush_040 (unsigned long addr, int scope, int cache, unsigned long len)
	{
	unsigned long paddr, i;

	switch (scope)
	{
	case FLUSH_SCOPE_ALL:
	switch (cache)
	{
	case FLUSH_CACHE_DATA:
	/* This nop is needed for some broken versions of the 68040. */
	__asm__ __volatile__ ("nop\n\t"
	".chip 68040\n\t"
	"cpusha %dc\n\t"
	".chip 68k");
	break;
	case FLUSH_CACHE_INSN:
	__asm__ __volatile__ ("nop\n\t"
	".chip 68040\n\t"
	"cpusha %ic\n\t"
	".chip 68k");
	break;
	default:
	case FLUSH_CACHE_BOTH:
	__asm__ __volatile__ ("nop\n\t"
	".chip 68040\n\t"
	"cpusha %bc\n\t"
	".chip 68k");
	break;
	}
	break;

	case FLUSH_SCOPE_LINE:
	/* Find the physical address of the first mapped page in the
	address range. */
	if ((paddr = virt_to_phys_040(addr))) {
	paddr += addr & ~(PAGE_MASK \| 15);
	len = (len + (addr & 15) + 15) >> 4;
	} else {
	unsigned long tmp = PAGE_SIZE - (addr & ~PAGE_MASK);

	if (len <= tmp)
	return 0;
	addr += tmp;
	len -= tmp;
	tmp = PAGE_SIZE;
	for (;;)
	{
	if ((paddr = virt_to_phys_040(addr)))
	break;
	if (len <= tmp)
	return 0;
	addr += tmp;
	len -= tmp;
	}
	len = (len + 15) >> 4;
	}
	i = (PAGE_SIZE - (paddr & ~PAGE_MASK)) >> 4;
	while (len--)
	{
	switch (cache)
	{
	case FLUSH_CACHE_DATA:
	__asm__ __volatile__ ("nop\n\t"
	".chip 68040\n\t"
	"cpushl %%dc,(%0)\n\t"
	".chip 68k"
	: : "a" (paddr));
	break;
	case FLUSH_CACHE_INSN:
	__asm__ __volatile__ ("nop\n\t"
	".chip 68040\n\t"
	"cpushl %%ic,(%0)\n\t"
	".chip 68k"
	: : "a" (paddr));
	break;
	default:
	case FLUSH_CACHE_BOTH:
	__asm__ __volatile__ ("nop\n\t"
	".chip 68040\n\t"
	"cpushl %%bc,(%0)\n\t"
	".chip 68k"
	: : "a" (paddr));
	break;
	}
	if (!--i && len)
	{
	/*
	* No need to page align here since it is done by
	* virt_to_phys_040().
	*/
	addr += PAGE_SIZE;
	i = PAGE_SIZE / 16;
	/* Recompute physical address when crossing a page
	boundary. */
	for (;;)
	{
	if ((paddr = virt_to_phys_040(addr)))
	break;
	if (len <= i)
	return 0;
	len -= i;
	addr += PAGE_SIZE;
	}
	}
	else
	paddr += 16;
	}
	break;

	default:
	case FLUSH_SCOPE_PAGE:
	len += (addr & ~PAGE_MASK) + (PAGE_SIZE - 1);
	for (len >>= PAGE_SHIFT; len--; addr += PAGE_SIZE)
	{
	if (!(paddr = virt_to_phys_040(addr)))
	continue;
	switch (cache)
	{
	case FLUSH_CACHE_DATA:
	__asm__ __volatile__ ("nop\n\t"
	".chip 68040\n\t"
	"cpushp %%dc,(%0)\n\t"
	".chip 68k"
	: : "a" (paddr));
	break;
	case FLUSH_CACHE_INSN:
	__asm__ __volatile__ ("nop\n\t"
	".chip 68040\n\t"
	"cpushp %%ic,(%0)\n\t"
	".chip 68k"
	: : "a" (paddr));
	break;
	default:
	case FLUSH_CACHE_BOTH:
	__asm__ __volatile__ ("nop\n\t"
	".chip 68040\n\t"
	"cpushp %%bc,(%0)\n\t"
	".chip 68k"
	: : "a" (paddr));
	break;
	}
	}
	break;
	}
	return 0;
	}

	#define virt_to_phys_060(vaddr) \
	({ \
	unsigned long paddr; \
	__asm__ __volatile__ (".chip 68060\n\t" \
	"plpar (%0)\n\t" \
	".chip 68k" \
	: "=a" (paddr) \
	: "0" (vaddr)); \
	(paddr); /* XXX */ \
	})

	static inline int
	cache_flush_060 (unsigned long addr, int scope, int cache, unsigned long len)
	{
	unsigned long paddr, i;

	/*
	* 68060 manual says:
	* cpush %dc : flush DC, remains valid (with our %cacr setup)
	* cpush %ic : invalidate IC
	* cpush %bc : flush DC + invalidate IC
	*/
	switch (scope)
	{
	case FLUSH_SCOPE_ALL:
	switch (cache)
	{
	case FLUSH_CACHE_DATA:
	__asm__ __volatile__ (".chip 68060\n\t"
	"cpusha %dc\n\t"
	".chip 68k");
	break;
	case FLUSH_CACHE_INSN:
	__asm__ __volatile__ (".chip 68060\n\t"
	"cpusha %ic\n\t"
	".chip 68k");
	break;
	default:
	case FLUSH_CACHE_BOTH:
	__asm__ __volatile__ (".chip 68060\n\t"
	"cpusha %bc\n\t"
	".chip 68k");
	break;
	}
	break;

	case FLUSH_SCOPE_LINE:
	/* Find the physical address of the first mapped page in the
	address range. */
	len += addr & 15;
	addr &= -16;
	if (!(paddr = virt_to_phys_060(addr))) {
	unsigned long tmp = PAGE_SIZE - (addr & ~PAGE_MASK);

	if (len <= tmp)
	return 0;
	addr += tmp;
	len -= tmp;
	tmp = PAGE_SIZE;
	for (;;)
	{
	if ((paddr = virt_to_phys_060(addr)))
	break;
	if (len <= tmp)
	return 0;
	addr += tmp;
	len -= tmp;
	}
	}
	len = (len + 15) >> 4;
	i = (PAGE_SIZE - (paddr & ~PAGE_MASK)) >> 4;
	while (len--)
	{
	switch (cache)
	{
	case FLUSH_CACHE_DATA:
	__asm__ __volatile__ (".chip 68060\n\t"
	"cpushl %%dc,(%0)\n\t"
	".chip 68k"
	: : "a" (paddr));
	break;
	case FLUSH_CACHE_INSN:
	__asm__ __volatile__ (".chip 68060\n\t"
	"cpushl %%ic,(%0)\n\t"
	".chip 68k"
	: : "a" (paddr));
	break;
	default:
	case FLUSH_CACHE_BOTH:
	__asm__ __volatile__ (".chip 68060\n\t"
	"cpushl %%bc,(%0)\n\t"
	".chip 68k"
	: : "a" (paddr));
	break;
	}
	if (!--i && len)
	{

	/*
	* We just want to jump to the first cache line
	* in the next page.
	*/
	addr += PAGE_SIZE;
	addr &= PAGE_MASK;

	i = PAGE_SIZE / 16;
	/* Recompute physical address when crossing a page
	boundary. */
	for (;;)
	{
	if ((paddr = virt_to_phys_060(addr)))
	break;
	if (len <= i)
	return 0;
	len -= i;
	addr += PAGE_SIZE;
	}
	}
	else
	paddr += 16;
	}
	break;

	default:
	case FLUSH_SCOPE_PAGE:
	len += (addr & ~PAGE_MASK) + (PAGE_SIZE - 1);
	addr &= PAGE_MASK; /* Workaround for bug in some
	revisions of the 68060 */
	for (len >>= PAGE_SHIFT; len--; addr += PAGE_SIZE)
	{
	if (!(paddr = virt_to_phys_060(addr)))
	continue;
	switch (cache)
	{
	case FLUSH_CACHE_DATA:
	__asm__ __volatile__ (".chip 68060\n\t"
	"cpushp %%dc,(%0)\n\t"
	".chip 68k"
	: : "a" (paddr));
	break;
	case FLUSH_CACHE_INSN:
	__asm__ __volatile__ (".chip 68060\n\t"
	"cpushp %%ic,(%0)\n\t"
	".chip 68k"
	: : "a" (paddr));
	break;
	default:
	case FLUSH_CACHE_BOTH:
	__asm__ __volatile__ (".chip 68060\n\t"
	"cpushp %%bc,(%0)\n\t"
	".chip 68k"
	: : "a" (paddr));
	break;
	}
	}
	break;
	}
	return 0;
	}

	/* sys_cacheflush -- flush (part of) the processor cache. */
	asmlinkage int
	sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
	{
	struct vm_area_struct *vma;
	int ret = -EINVAL;

	lock_kernel();
	if (scope < FLUSH_SCOPE_LINE \|\| scope > FLUSH_SCOPE_ALL \|\|
	cache & ~FLUSH_CACHE_BOTH)
	goto out;

	if (scope == FLUSH_SCOPE_ALL) {
	/* Only the superuser may explicitly flush the whole cache. */
	ret = -EPERM;
	if (!capable(CAP_SYS_ADMIN))
	goto out;
	} else {
	/*
	* Verify that the specified address region actually belongs
	* to this process.
	*/
	vma = find_vma (current->mm, addr);
	ret = -EINVAL;
	/* Check for overflow. */
	if (addr + len < addr)
	goto out;
	if (vma == NULL \|\| addr < vma->vm_start \|\| addr + len > vma->vm_end)
	goto out;
	}

	if (CPU_IS_020_OR_030) {
	if (scope == FLUSH_SCOPE_LINE && len < 256) {
	unsigned long cacr;
	__asm__ ("movec %%cacr, %0" : "=r" (cacr));
	if (cache & FLUSH_CACHE_INSN)
	cacr \|= 4;
	if (cache & FLUSH_CACHE_DATA)
	cacr \|= 0x400;
	len >>= 2;
	while (len--) {
	__asm__ __volatile__ ("movec %1, %%caar\n\t"
	"movec %0, %%cacr"
	: /* no outputs */
	: "r" (cacr), "r" (addr));
	addr += 4;
	}
	} else {
	/* Flush the whole cache, even if page granularity requested. */
	unsigned long cacr;
	__asm__ ("movec %%cacr, %0" : "=r" (cacr));
	if (cache & FLUSH_CACHE_INSN)
	cacr \|= 8;
	if (cache & FLUSH_CACHE_DATA)
	cacr \|= 0x800;
	__asm__ __volatile__ ("movec %0, %%cacr" : : "r" (cacr));
	}
	ret = 0;
	goto out;
	} else {
	/*
	* 040 or 060: don't blindly trust 'scope', someone could
	* try to flush a few megs of memory.
	*/

	if (len>=3*PAGE_SIZE && scope<FLUSH_SCOPE_PAGE)
	scope=FLUSH_SCOPE_PAGE;
	if (len>=10*PAGE_SIZE && scope<FLUSH_SCOPE_ALL)
	scope=FLUSH_SCOPE_ALL;
	if (CPU_IS_040) {
	ret = cache_flush_040 (addr, scope, cache, len);
	} else if (CPU_IS_060) {
	ret = cache_flush_060 (addr, scope, cache, len);
	}
	}
	out:
	unlock_kernel();
	return ret;
	}

	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, char const argv[], 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)
	{
	/* This was borrowed from ARM's implementation. */
	for (;;) {
	struct mm_struct *mm = current->mm;
	pgd_t *pgd;
	pmd_t *pmd;
	pte_t *pte;
	spinlock_t *ptl;
	unsigned long mem_value;

	down_read(&mm->mmap_sem);
	pgd = pgd_offset(mm, (unsigned long)mem);
	if (!pgd_present(*pgd))
	goto bad_access;
	pmd = pmd_offset(pgd, (unsigned long)mem);
	if (!pmd_present(*pmd))
	goto bad_access;
	pte = pte_offset_map_lock(mm, pmd, (unsigned long)mem, &ptl);
	if (!pte_present(pte) \|\| !pte_dirty(pte)
	\|\| !pte_write(*pte)) {
	pte_unmap_unlock(pte, ptl);
	goto bad_access;
	}

	mem_value = *mem;
	if (mem_value == oldval)
	*mem = newval;

	pte_unmap_unlock(pte, ptl);
	up_read(&mm->mmap_sem);
	return mem_value;

	bad_access:
	up_read(&mm->mmap_sem);
	/* This is not necessarily a bad access, we can get here if
	a memory we're trying to write to should be copied-on-write.
	Make the kernel do the necessary page stuff, then re-iterate.
	Simulate a write access fault to do that. */
	{
	/* The first argument of the function corresponds to
	D1, which is the first field of struct pt_regs. */
	struct pt_regs fp = (struct pt_regs )&newval;

	/* '3' is an RMW flag. */
	if (do_page_fault(fp, (unsigned long)mem, 3))
	/* If the do_page_fault() failed, we don't
	have anything meaningful to return.
	There should be a SIGSEGV pending for
	the process. */
	return 0xdeadbeef;
	}
	}
	}

	asmlinkage int sys_atomic_barrier(void)
	{
	/* no code needed for uniprocs */
	return 0;
	}