[mirror_ubuntu-zesty-kernel.git] / arch / m68k / kernel / sys_m68k.c

/*
 * 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/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 <asm/cacheflush.h>

#ifdef CONFIG_MMU

#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;

	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:
	return ret;
}

/* 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;
		}

		/*
		 * No need to check for EFAULT; we know that the page is
		 * present and writable.
		 */
		__get_user(mem_value, mem);
		if (mem_value == oldval)
			__put_user(newval, mem);

		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;
		}
	}
}

#else

/* 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;
}

/* 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;
}

#endif /* CONFIG_MMU */

asmlinkage int sys_getpagesize(void)
{
	return PAGE_SIZE;
}

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;
}

asmlinkage int sys_atomic_barrier(void)
{
	/* no code needed for uniprocs */
	return 0;
}
Commit	Line	Data
cae2e6cc GU	1	/*
	2	* linux/arch/m68k/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/capability.h>
	10	#include <linux/errno.h>
	11	#include <linux/sched.h>
	12	#include <linux/mm.h>
	13	#include <linux/fs.h>
	14	#include <linux/smp.h>
	15	#include <linux/sem.h>
	16	#include <linux/msg.h>
	17	#include <linux/shm.h>
	18	#include <linux/stat.h>
	19	#include <linux/syscalls.h>
	20	#include <linux/mman.h>
	21	#include <linux/file.h>
	22	#include <linux/ipc.h>
	23
	24	#include <asm/setup.h>
	25	#include <asm/uaccess.h>
	26	#include <asm/cachectl.h>
	27	#include <asm/traps.h>
	28	#include <asm/page.h>
	29	#include <asm/unistd.h>
	30	#include <asm/cacheflush.h>
	31
66d857b0	32	#ifdef CONFIG_MMU
cae2e6cc GU	33
	34	#include <asm/tlb.h>
	35
	36	asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
	37	unsigned long error_code);
	38
	39	asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
	40	unsigned long prot, unsigned long flags,
	41	unsigned long fd, unsigned long pgoff)
	42	{
	43	/*
	44	* This is wrong for sun3 - there PAGE_SIZE is 8Kb,
	45	* so we need to shift the argument down by 1; m68k mmap64(3)
	46	* (in libc) expects the last argument of mmap2 in 4Kb units.
	47	*/
	48	return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff);
	49	}
	50
	51	/* Convert virtual (user) address VADDR to physical address PADDR */
	52	#define virt_to_phys_040(vaddr) \
	53	({ \
	54	unsigned long _mmusr, _paddr; \
	55	\
	56	__asm__ __volatile__ (".chip 68040\n\t" \
	57	"ptestr (%1)\n\t" \
	58	"movec %%mmusr,%0\n\t" \
	59	".chip 68k" \
	60	: "=r" (_mmusr) \
	61	: "a" (vaddr)); \
	62	_paddr = (_mmusr & MMU_R_040) ? (_mmusr & PAGE_MASK) : 0; \
	63	_paddr; \
	64	})
	65
	66	static inline int
	67	cache_flush_040 (unsigned long addr, int scope, int cache, unsigned long len)
	68	{
	69	unsigned long paddr, i;
	70
	71	switch (scope)
	72	{
	73	case FLUSH_SCOPE_ALL:
	74	switch (cache)
	75	{
	76	case FLUSH_CACHE_DATA:
	77	/* This nop is needed for some broken versions of the 68040. */
	78	__asm__ __volatile__ ("nop\n\t"
	79	".chip 68040\n\t"
	80	"cpusha %dc\n\t"
	81	".chip 68k");
	82	break;
	83	case FLUSH_CACHE_INSN:
	84	__asm__ __volatile__ ("nop\n\t"
	85	".chip 68040\n\t"
	86	"cpusha %ic\n\t"
	87	".chip 68k");
	88	break;
	89	default:
	90	case FLUSH_CACHE_BOTH:
	91	__asm__ __volatile__ ("nop\n\t"
	92	".chip 68040\n\t"
	93	"cpusha %bc\n\t"
	94	".chip 68k");
	95	break;
	96	}
97	break;
98
99	case FLUSH_SCOPE_LINE:
100	/* Find the physical address of the first mapped page in the
101	address range. */
102	if ((paddr = virt_to_phys_040(addr))) {
103	paddr += addr & ~(PAGE_MASK \| 15);
104	len = (len + (addr & 15) + 15) >> 4;
105	} else {
106	unsigned long tmp = PAGE_SIZE - (addr & ~PAGE_MASK);
107
108	if (len <= tmp)
109	return 0;
110	addr += tmp;
111	len -= tmp;
112	tmp = PAGE_SIZE;
113	for (;;)
114	{
115	if ((paddr = virt_to_phys_040(addr)))
116	break;
117	if (len <= tmp)
118	return 0;
119	addr += tmp;
120	len -= tmp;
121	}
122	len = (len + 15) >> 4;
123	}
124	i = (PAGE_SIZE - (paddr & ~PAGE_MASK)) >> 4;
125	while (len--)
126	{
127	switch (cache)
128	{
129	case FLUSH_CACHE_DATA:
130	__asm__ __volatile__ ("nop\n\t"
131	".chip 68040\n\t"
132	"cpushl %%dc,(%0)\n\t"
133	".chip 68k"
134	: : "a" (paddr));
135	break;
136	case FLUSH_CACHE_INSN:
137	__asm__ __volatile__ ("nop\n\t"
138	".chip 68040\n\t"
139	"cpushl %%ic,(%0)\n\t"
140	".chip 68k"
141	: : "a" (paddr));
142	break;
143	default:
144	case FLUSH_CACHE_BOTH:
145	__asm__ __volatile__ ("nop\n\t"
146	".chip 68040\n\t"
147	"cpushl %%bc,(%0)\n\t"
148	".chip 68k"
149	: : "a" (paddr));
150	break;
151	}
152	if (!--i && len)
153	{
154	/*
155	* No need to page align here since it is done by
156	* virt_to_phys_040().
157	*/
158	addr += PAGE_SIZE;
159	i = PAGE_SIZE / 16;
160	/* Recompute physical address when crossing a page
161	boundary. */
162	for (;;)
163	{
164	if ((paddr = virt_to_phys_040(addr)))
165	break;
166	if (len <= i)
167	return 0;
168	len -= i;
169	addr += PAGE_SIZE;
170	}
171	}
172	else
173	paddr += 16;
174	}
175	break;
176
177	default:
178	case FLUSH_SCOPE_PAGE:
179	len += (addr & ~PAGE_MASK) + (PAGE_SIZE - 1);
180	for (len >>= PAGE_SHIFT; len--; addr += PAGE_SIZE)
181	{
182	if (!(paddr = virt_to_phys_040(addr)))
183	continue;
184	switch (cache)
185	{
186	case FLUSH_CACHE_DATA:
187	__asm__ __volatile__ ("nop\n\t"
188	".chip 68040\n\t"
189	"cpushp %%dc,(%0)\n\t"
190	".chip 68k"
191	: : "a" (paddr));
192	break;
193	case FLUSH_CACHE_INSN:
194	__asm__ __volatile__ ("nop\n\t"
195	".chip 68040\n\t"
196	"cpushp %%ic,(%0)\n\t"
197	".chip 68k"
198	: : "a" (paddr));
199	break;
200	default:
201	case FLUSH_CACHE_BOTH:
202	__asm__ __volatile__ ("nop\n\t"
203	".chip 68040\n\t"
204	"cpushp %%bc,(%0)\n\t"
205	".chip 68k"
206	: : "a" (paddr));
207	break;
208	}
209	}
210	break;
211	}
212	return 0;
213	}
214
215	#define virt_to_phys_060(vaddr) \
216	({ \
217	unsigned long paddr; \
218	__asm__ __volatile__ (".chip 68060\n\t" \
219	"plpar (%0)\n\t" \
220	".chip 68k" \
221	: "=a" (paddr) \
222	: "0" (vaddr)); \
223	(paddr); /* XXX */ \
224	})
225
226	static inline int
227	cache_flush_060 (unsigned long addr, int scope, int cache, unsigned long len)
228	{
229	unsigned long paddr, i;
230
231	/*
232	* 68060 manual says:
233	* cpush %dc : flush DC, remains valid (with our %cacr setup)
234	* cpush %ic : invalidate IC
235	* cpush %bc : flush DC + invalidate IC
236	*/
237	switch (scope)
238	{
239	case FLUSH_SCOPE_ALL:
240	switch (cache)
241	{
242	case FLUSH_CACHE_DATA:
243	__asm__ __volatile__ (".chip 68060\n\t"
244	"cpusha %dc\n\t"
245	".chip 68k");
246	break;
247	case FLUSH_CACHE_INSN:
248	__asm__ __volatile__ (".chip 68060\n\t"
249	"cpusha %ic\n\t"
250	".chip 68k");
251	break;
252	default:
253	case FLUSH_CACHE_BOTH:
254	__asm__ __volatile__ (".chip 68060\n\t"
255	"cpusha %bc\n\t"
256	".chip 68k");
257	break;
258	}
259	break;
260
261	case FLUSH_SCOPE_LINE:
262	/* Find the physical address of the first mapped page in the
263	address range. */
264	len += addr & 15;
265	addr &= -16;
266	if (!(paddr = virt_to_phys_060(addr))) {
267	unsigned long tmp = PAGE_SIZE - (addr & ~PAGE_MASK);
268
269	if (len <= tmp)
270	return 0;
271	addr += tmp;
272	len -= tmp;
273	tmp = PAGE_SIZE;
274	for (;;)
275	{
276	if ((paddr = virt_to_phys_060(addr)))
277	break;
278	if (len <= tmp)
279	return 0;
280	addr += tmp;
281	len -= tmp;
282	}
283	}
284	len = (len + 15) >> 4;
285	i = (PAGE_SIZE - (paddr & ~PAGE_MASK)) >> 4;
286	while (len--)
287	{
288	switch (cache)
289	{
290	case FLUSH_CACHE_DATA:
291	__asm__ __volatile__ (".chip 68060\n\t"
292	"cpushl %%dc,(%0)\n\t"
293	".chip 68k"
294	: : "a" (paddr));
295	break;
296	case FLUSH_CACHE_INSN:
297	__asm__ __volatile__ (".chip 68060\n\t"
298	"cpushl %%ic,(%0)\n\t"
299	".chip 68k"
300	: : "a" (paddr));
301	break;
302	default:
303	case FLUSH_CACHE_BOTH:
304	__asm__ __volatile__ (".chip 68060\n\t"
305	"cpushl %%bc,(%0)\n\t"
306	".chip 68k"
307	: : "a" (paddr));
308	break;
309	}
310	if (!--i && len)
311	{
312
313	/*
314	* We just want to jump to the first cache line
315	* in the next page.
316	*/
317	addr += PAGE_SIZE;
318	addr &= PAGE_MASK;
319
320	i = PAGE_SIZE / 16;
321	/* Recompute physical address when crossing a page
322	boundary. */
323	for (;;)
324	{
325	if ((paddr = virt_to_phys_060(addr)))
326	break;
327	if (len <= i)
328	return 0;
329	len -= i;
330	addr += PAGE_SIZE;
331	}
332	}
333	else
334	paddr += 16;
335	}
336	break;
337
338	default:
339	case FLUSH_SCOPE_PAGE:
340	len += (addr & ~PAGE_MASK) + (PAGE_SIZE - 1);
341	addr &= PAGE_MASK; /* Workaround for bug in some
342	revisions of the 68060 */
343	for (len >>= PAGE_SHIFT; len--; addr += PAGE_SIZE)
344	{
345	if (!(paddr = virt_to_phys_060(addr)))
346	continue;
347	switch (cache)
348	{
349	case FLUSH_CACHE_DATA:
350	__asm__ __volatile__ (".chip 68060\n\t"
351	"cpushp %%dc,(%0)\n\t"
352	".chip 68k"
353	: : "a" (paddr));
354	break;
355	case FLUSH_CACHE_INSN:
356	__asm__ __volatile__ (".chip 68060\n\t"
357	"cpushp %%ic,(%0)\n\t"
358	".chip 68k"
359	: : "a" (paddr));
360	break;
361	default:
362	case FLUSH_CACHE_BOTH:
363	__asm__ __volatile__ (".chip 68060\n\t"
364	"cpushp %%bc,(%0)\n\t"
365	".chip 68k"
366	: : "a" (paddr));
367	break;
368	}
369	}
370	break;
371	}
372	return 0;
373	}
374
375	/* sys_cacheflush -- flush (part of) the processor cache. */
376	asmlinkage int
377	sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
378	{
379	struct vm_area_struct *vma;
380	int ret = -EINVAL;
381
382	if (scope < FLUSH_SCOPE_LINE \|\| scope > FLUSH_SCOPE_ALL \|\|
383	cache & ~FLUSH_CACHE_BOTH)
384	goto out;
385
386	if (scope == FLUSH_SCOPE_ALL) {
387	/* Only the superuser may explicitly flush the whole cache. */
388	ret = -EPERM;
389	if (!capable(CAP_SYS_ADMIN))
390	goto out;
391	} else {
392	/*
393	* Verify that the specified address region actually belongs
394	* to this process.
395	*/
396	vma = find_vma (current->mm, addr);
397	ret = -EINVAL;
398	/* Check for overflow. */
399	if (addr + len < addr)
400	goto out;
401	if (vma == NULL \|\| addr < vma->vm_start \|\| addr + len > vma->vm_end)
402	goto out;
403	}
404
405	if (CPU_IS_020_OR_030) {
406	if (scope == FLUSH_SCOPE_LINE && len < 256) {
407	unsigned long cacr;
408	__asm__ ("movec %%cacr, %0" : "=r" (cacr));
409	if (cache & FLUSH_CACHE_INSN)
410	cacr \|= 4;
411	if (cache & FLUSH_CACHE_DATA)
412	cacr \|= 0x400;
413	len >>= 2;
414	while (len--) {
415	__asm__ __volatile__ ("movec %1, %%caar\n\t"
416	"movec %0, %%cacr"
417	: /* no outputs */
418	: "r" (cacr), "r" (addr));
419	addr += 4;
420	}
421	} else {
422	/* Flush the whole cache, even if page granularity requested. */
423	unsigned long cacr;
424	__asm__ ("movec %%cacr, %0" : "=r" (cacr));
425	if (cache & FLUSH_CACHE_INSN)
426	cacr \|= 8;
427	if (cache & FLUSH_CACHE_DATA)
428	cacr \|= 0x800;
429	__asm__ __volatile__ ("movec %0, %%cacr" : : "r" (cacr));
430	}
431	ret = 0;
432	goto out;
433	} else {
434	/*
435	* 040 or 060: don't blindly trust 'scope', someone could
436	* try to flush a few megs of memory.
437	*/
438
439	if (len>=3*PAGE_SIZE && scope<FLUSH_SCOPE_PAGE)
440	scope=FLUSH_SCOPE_PAGE;
441	if (len>=10*PAGE_SIZE && scope<FLUSH_SCOPE_ALL)
442	scope=FLUSH_SCOPE_ALL;
443	if (CPU_IS_040) {
444	ret = cache_flush_040 (addr, scope, cache, len);
445	} else if (CPU_IS_060) {
446	ret = cache_flush_060 (addr, scope, cache, len);
447	}
448	}
449	out:
450	return ret;
451	}
452
453	/* This syscall gets its arguments in A0 (mem), D2 (oldval) and
454	D1 (newval). */
455	asmlinkage int
456	sys_atomic_cmpxchg_32(unsigned long newval, int oldval, int d3, int d4, int d5,
457	unsigned long __user * mem)
458	{
459	/* This was borrowed from ARM's implementation. */
460	for (;;) {
461	struct mm_struct *mm = current->mm;
462	pgd_t *pgd;
463	pmd_t *pmd;
464	pte_t *pte;
465	spinlock_t *ptl;
466	unsigned long mem_value;
467
468	down_read(&mm->mmap_sem);
469	pgd = pgd_offset(mm, (unsigned long)mem);
470	if (!pgd_present(*pgd))
471	goto bad_access;
472	pmd = pmd_offset(pgd, (unsigned long)mem);
473	if (!pmd_present(*pmd))
474	goto bad_access;
475	pte = pte_offset_map_lock(mm, pmd, (unsigned long)mem, &ptl);
476	if (!pte_present(pte) \|\| !pte_dirty(pte)
477	\|\| !pte_write(*pte)) {
478	pte_unmap_unlock(pte, ptl);
479	goto bad_access;
480	}
481
9e2760d1 AS	482	/*
	483	* No need to check for EFAULT; we know that the page is
	484	* present and writable.
	485	*/
	486	__get_user(mem_value, mem);
cae2e6cc	487	if (mem_value == oldval)
9e2760d1	488	__put_user(newval, mem);
cae2e6cc GU	489
	490	pte_unmap_unlock(pte, ptl);
	491	up_read(&mm->mmap_sem);
	492	return mem_value;
	493
	494	bad_access:
	495	up_read(&mm->mmap_sem);
	496	/* This is not necessarily a bad access, we can get here if
	497	a memory we're trying to write to should be copied-on-write.
	498	Make the kernel do the necessary page stuff, then re-iterate.
	499	Simulate a write access fault to do that. */
	500	{
	501	/* The first argument of the function corresponds to
	502	D1, which is the first field of struct pt_regs. */
	503	struct pt_regs fp = (struct pt_regs )&newval;
	504
	505	/* '3' is an RMW flag. */
	506	if (do_page_fault(fp, (unsigned long)mem, 3))
	507	/* If the do_page_fault() failed, we don't
	508	have anything meaningful to return.
	509	There should be a SIGSEGV pending for
	510	the process. */
	511	return 0xdeadbeef;
	512	}
	513	}
	514	}
	515
66d857b0	516	#else
cae2e6cc GU	517
	518	/* sys_cacheflush -- flush (part of) the processor cache. */
	519	asmlinkage int
	520	sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
	521	{
	522	flush_cache_all();
	523	return 0;
	524	}
	525
	526	/* This syscall gets its arguments in A0 (mem), D2 (oldval) and
	527	D1 (newval). */
	528	asmlinkage int
	529	sys_atomic_cmpxchg_32(unsigned long newval, int oldval, int d3, int d4, int d5,
	530	unsigned long __user * mem)
	531	{
	532	struct mm_struct *mm = current->mm;
	533	unsigned long mem_value;
	534
	535	down_read(&mm->mmap_sem);
	536
	537	mem_value = *mem;
	538	if (mem_value == oldval)
	539	*mem = newval;
	540
	541	up_read(&mm->mmap_sem);
	542	return mem_value;
	543	}
	544
	545	#endif /* CONFIG_MMU */
	546
	547	asmlinkage int sys_getpagesize(void)
	548	{
	549	return PAGE_SIZE;
	550	}
	551
cae2e6cc GU	552	asmlinkage unsigned long sys_get_thread_area(void)
	553	{
	554	return current_thread_info()->tp_value;
	555	}
	556
	557	asmlinkage int sys_set_thread_area(unsigned long tp)
	558	{
	559	current_thread_info()->tp_value = tp;
	560	return 0;
	561	}
	562
	563	asmlinkage int sys_atomic_barrier(void)
	564	{
	565	/* no code needed for uniprocs */
	566	return 0;
	567	}