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/*

 * Copyright (c) 2006 Jakub Jermar

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - Redistributions in binary form must reproduce the above copyright

 *   notice, this list of conditions and the following disclaimer in the

 *   documentation and/or other materials provided with the distribution.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/** @addtogroup sparc64mm	

 * @{

 */

/** @file

 */

#include <arch/mm/tsb.h>

#include <arch/mm/tlb.h>

#include <arch/mm/page.h>

#include <arch/barrier.h>

#include <mm/as.h>

#include <arch/types.h>

#include <macros.h>

#include <debug.h>

#define TSB_INDEX_MASK	((1 << (21 + 1 + TSB_SIZE - MMU_PAGE_WIDTH)) - 1)

/** Invalidate portion of TSB.

 *

 * We assume that the address space is already locked. Note that respective

 * portions of both TSBs are invalidated at a time.

 *

 * @param as Address space.

 * @param page First page to invalidate in TSB.

 * @param pages Number of pages to invalidate. Value of (size_t) -1 means the

 * 	whole TSB.

 */

void tsb_invalidate(as_t *as, uintptr_t page, size_t pages)

{

	size_t i0;

	size_t i;

	size_t cnt;

	ASSERT(as->arch.itsb && as->arch.dtsb);

	i0 = (page >> MMU_PAGE_WIDTH) & TSB_INDEX_MASK;

	ASSERT(i0 < ITSB_ENTRY_COUNT && i0 < DTSB_ENTRY_COUNT);

	if (pages == (size_t) -1 || (pages * 2) > ITSB_ENTRY_COUNT)

		cnt = ITSB_ENTRY_COUNT;

	else

		cnt = pages * 2;

	for (i = 0; i < cnt; i++) {

		as->arch.itsb[(i0 + i) & (ITSB_ENTRY_COUNT - 1)].tag.invalid =

		    true;

		as->arch.dtsb[(i0 + i) & (DTSB_ENTRY_COUNT - 1)].tag.invalid =

		    true;

	}

}

/** Copy software PTE to ITSB.

 *

 * @param t 	Software PTE.

 * @param index	Zero if lower 8K-subpage, one if higher 8K subpage.

 */

void itsb_pte_copy(pte_t *t, size_t index)

{

	as_t *as;

	tsb_entry_t *tsb;

	size_t entry;

	ASSERT(index <= 1);

	as = t->as;

	entry = ((t->page >> MMU_PAGE_WIDTH) + index) & TSB_INDEX_MASK; 

	ASSERT(entry < ITSB_ENTRY_COUNT);

	tsb = &as->arch.itsb[entry];

	/*

	 * We use write barriers to make sure that the TSB load

	 * won't use inconsistent data or that the fault will

	 * be repeated.

	 */

	tsb->tag.invalid = true;	/* invalidate the entry

					 * (tag target has this

					 * set to 0) */

	write_barrier();

	tsb->tag.context = as->asid;

	/* the shift is bigger than PAGE_WIDTH, do not bother with index  */

	tsb->tag.va_tag = t->page >> VA_TAG_PAGE_SHIFT;

	tsb->data.value = 0;

	tsb->data.size = PAGESIZE_8K;

	tsb->data.pfn = (t->frame >> MMU_FRAME_WIDTH) + index;

	tsb->data.cp = t->c;	/* cp as cache in phys.-idxed, c as cacheable */

	tsb->data.p = t->k;	/* p as privileged, k as kernel */

	tsb->data.v = t->p;	/* v as valid, p as present */

	write_barrier();

	tsb->tag.invalid = false;	/* mark the entry as valid */

}

/** Copy software PTE to DTSB.

 *

 * @param t	Software PTE.

 * @param index	Zero if lower 8K-subpage, one if higher 8K-subpage.

 * @param ro	If true, the mapping is copied read-only.

 */

void dtsb_pte_copy(pte_t *t, size_t index, bool ro)

{

	as_t *as;

	tsb_entry_t *tsb;

	size_t entry;

	ASSERT(index <= 1);

	as = t->as;

	entry = ((t->page >> MMU_PAGE_WIDTH) + index) & TSB_INDEX_MASK;

	ASSERT(entry < DTSB_ENTRY_COUNT);

	tsb = &as->arch.dtsb[entry];

	/*

	 * We use write barriers to make sure that the TSB load

	 * won't use inconsistent data or that the fault will

	 * be repeated.

	 */

	tsb->tag.invalid = true;	/* invalidate the entry

					 * (tag target has this

					 * set to 0) */

	write_barrier();

	tsb->tag.context = as->asid;

	/* the shift is bigger than PAGE_WIDTH, do not bother with index */

	tsb->tag.va_tag = t->page >> VA_TAG_PAGE_SHIFT;

	tsb->data.value = 0;

	tsb->data.size = PAGESIZE_8K;

	tsb->data.pfn = (t->frame >> MMU_FRAME_WIDTH) + index;

	tsb->data.cp = t->c;

#ifdef CONFIG_VIRT_IDX_DCACHE

	tsb->data.cv = t->c;

#endif /* CONFIG_VIRT_IDX_DCACHE */

	tsb->data.p = t->k;		/* p as privileged */

	tsb->data.w = ro ? false : t->w;

	tsb->data.v = t->p;

	write_barrier();

	tsb->tag.invalid = false;	/* mark the entry as valid */

}

/** @}

 */