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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/as.h>

#include <arch/mm/tlb.h>

#include <genarch/mm/as_ht.h>

#include <genarch/mm/asid_fifo.h>

#include <debug.h>

#include <config.h>

#ifdef CONFIG_TSB

#include <arch/mm/tsb.h>

#include <arch/memstr.h>

#include <synch/mutex.h>

#include <arch/asm.h>

#include <mm/frame.h>

#include <bitops.h>

#include <macros.h>

#endif /* CONFIG_TSB */

#ifdef CONFIG_VIRT_IDX_DCACHE

#include <arch/mm/cache.h>

#endif /* CONFIG_VIRT_IDX_DCACHE */

/** Architecture dependent address space init. */

void as_arch_init(void)

{

	if (config.cpu_active == 1) {

		as_operations = &as_ht_operations;

		asid_fifo_init();

	}

}

int as_constructor_arch(as_t *as, int flags)

{

#ifdef CONFIG_TSB

	int order = fnzb32(((ITSB_ENTRY_COUNT+DTSB_ENTRY_COUNT)*sizeof(tsb_entry_t))>>FRAME_WIDTH);

	uintptr_t tsb = (uintptr_t) frame_alloc(order, flags | FRAME_KA);

	if (!tsb)

		return -1;

	as->arch.itsb = (tsb_entry_t *) tsb;

	as->arch.dtsb = (tsb_entry_t *) (tsb + ITSB_ENTRY_COUNT * sizeof(tsb_entry_t));

	memsetb((uintptr_t) as->arch.itsb, (ITSB_ENTRY_COUNT+DTSB_ENTRY_COUNT)*sizeof(tsb_entry_t), 0);

#endif

	return 0;

}

int as_destructor_arch(as_t *as)

{

#ifdef CONFIG_TSB

	count_t cnt = ((ITSB_ENTRY_COUNT+DTSB_ENTRY_COUNT)*sizeof(tsb_entry_t))>>FRAME_WIDTH;

	frame_free(KA2PA((uintptr_t) as->arch.itsb));

	return cnt;

#else

	return 0;

#endif

}

int as_create_arch(as_t *as, int flags)

{

#ifdef CONFIG_TSB

	ipl_t ipl;

	ipl = interrupts_disable();

	mutex_lock_active(&as->lock);	/* completely unnecessary, but polite */

	tsb_invalidate(as, 0, (count_t) -1);

	mutex_unlock(&as->lock);

	interrupts_restore(ipl);

#endif

	return 0;

}

/** Perform sparc64-specific tasks when an address space becomes active on the processor.

 *

 * Install ASID and map TSBs.

 *

 * @param as Address space.

 */

void as_install_arch(as_t *as)

{

	tlb_context_reg_t ctx;

	/*

	 * Note that we don't lock the address space.

	 * That's correct - we can afford it here

	 * because we only read members that are

	 * currently read-only.

	 */

	/*

	 * Write ASID to secondary context register.

	 * The primary context register has to be set

	 * from TL>0 so it will be filled from the

	 * secondary context register from the TL=1

	 * code just before switch to userspace.

	 */

	ctx.v = 0;

	ctx.context = as->asid;

	mmu_secondary_context_write(ctx.v);

#ifdef CONFIG_TSB	

	uintptr_t base = ALIGN_DOWN(config.base, 1 << KERNEL_PAGE_WIDTH);

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

	uintptr_t tsb = (uintptr_t) as->arch.itsb;

	if (!overlaps(tsb, 8*PAGE_SIZE, base, 1 << KERNEL_PAGE_WIDTH)) {

		/*

		 * TSBs were allocated from memory not covered

		 * by the locked 4M kernel DTLB entry. We need

		 * to map both TSBs explicitly.

		 */

		dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, tsb);

		dtlb_insert_mapping(tsb, KA2PA(tsb), PAGESIZE_64K, true, true);

	}

	/*

	 * Setup TSB Base registers.

	 */

	tsb_base_reg_t tsb_base;

	tsb_base.value = 0;

	tsb_base.size = TSB_SIZE;

	tsb_base.split = 0;

	tsb_base.base = ((uintptr_t) as->arch.itsb) >> PAGE_WIDTH;

	itsb_base_write(tsb_base.value);

	tsb_base.base = ((uintptr_t) as->arch.dtsb) >> PAGE_WIDTH;

	dtsb_base_write(tsb_base.value);

#endif

#ifdef CONFIG_VIRT_IDX_DCACHE

	if (as->dcache_flush_on_install) {

		/*

		 * Some mappings in this address space are illegal address

		 * aliases. Upon their creation, the flush_dcache_on_install

		 * flag was set.

		 *

		 * We are now obliged to flush the D-cache in order to guarantee

		 * that there will be at most one cache line for each address

		 * alias.

		 *

		 * This flush performs a cleanup after another address space in

		 * which the alias might have existed.

		 */

		dcache_flush();

	}

#endif /* CONFIG_VIRT_IDX_DCACHE */

}

/** Perform sparc64-specific tasks when an address space is removed from the processor.

 *

 * Demap TSBs.

 *

 * @param as Address space.

 */

void as_deinstall_arch(as_t *as)

{

	/*

	 * Note that we don't lock the address space.

	 * That's correct - we can afford it here

	 * because we only read members that are

	 * currently read-only.

	 */

#ifdef CONFIG_TSB

	uintptr_t base = ALIGN_DOWN(config.base, 1 << KERNEL_PAGE_WIDTH);

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

	uintptr_t tsb = (uintptr_t) as->arch.itsb;

	if (!overlaps(tsb, 8*PAGE_SIZE, base, 1 << KERNEL_PAGE_WIDTH)) {

		/*

		 * TSBs were allocated from memory not covered

		 * by the locked 4M kernel DTLB entry. We need

		 * to demap the entry installed by as_install_arch().

		 */

		dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, tsb);

	}

#endif

#ifdef CONFIG_VIRT_IDX_DCACHE

	if (as->dcache_flush_on_deinstall) {

		/*

		 * Some mappings in this address space are illegal address

		 * aliases. Upon their creation, the flush_dcache_on_deinstall

		 * flag was set.

		 *

		 * We are now obliged to flush the D-cache in order to guarantee

		 * that there will be at most one cache line for each address

		 * alias.

		 *

		 * This flush performs a cleanup after this address space. It is

		 * necessary because other address spaces that contain the same

		 * alias are not necessarily aware of the need to carry out the

		 * cache flush. The only address spaces that are aware of it are

		 * those that created the illegal alias. 

		 */

		dcache_flush();

	}

#endif /* CONFIG_VIRT_IDX_DCACHE */

}

/** @}

 */