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/*

 * Copyright (C) 2005 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/tlb.h>

#include <mm/tlb.h>

#include <mm/as.h>

#include <mm/asid.h>

#include <arch/mm/frame.h>

#include <arch/mm/page.h>

#include <arch/mm/mmu.h>

#include <arch/interrupt.h>

#include <interrupt.h>

#include <arch.h>

#include <print.h>

#include <arch/types.h>

#include <typedefs.h>

#include <config.h>

#include <arch/trap/trap.h>

#include <arch/trap/exception.h>

#include <panic.h>

#include <arch/asm.h>

static void dtlb_pte_copy(pte_t *t, bool ro);

static void itlb_pte_copy(pte_t *t);

static void do_fast_instruction_access_mmu_miss_fault(istate_t *istate, const char *str);

static void do_fast_data_access_mmu_miss_fault(istate_t *istate, tlb_tag_access_reg_t tag, const char *str);

static void do_fast_data_access_protection_fault(istate_t *istate, tlb_tag_access_reg_t tag, const char *str);

char *context_encoding[] = {

	"Primary",

	"Secondary",

	"Nucleus",

	"Reserved"

};

void tlb_arch_init(void)

{

	/*

	 * TLBs are actually initialized early

	 * in start.S.

	 */

}

/** Insert privileged mapping into DMMU TLB.

 *

 * @param page Virtual page address.

 * @param frame Physical frame address.

 * @param pagesize Page size.

 * @param locked True for permanent mappings, false otherwise.

 * @param cacheable True if the mapping is cacheable, false otherwise.

 */

void dtlb_insert_mapping(uintptr_t page, uintptr_t frame, int pagesize, bool locked, bool cacheable)

{

	tlb_tag_access_reg_t tag;

	tlb_data_t data;

	page_address_t pg;

	frame_address_t fr;

	pg.address = page;

	fr.address = frame;

	tag.value = ASID_KERNEL;

	tag.vpn = pg.vpn;

	dtlb_tag_access_write(tag.value);

	data.value = 0;

	data.v = true;

	data.size = pagesize;

	data.pfn = fr.pfn;

	data.l = locked;

	data.cp = cacheable;

	data.cv = cacheable;

	data.p = true;

	data.w = true;

	data.g = false;

	dtlb_data_in_write(data.value);

}

/** Copy PTE to TLB.

 *

 * @param t Page Table Entry to be copied.

 * @param ro If true, the entry will be created read-only, regardless of its w field.

 */

void dtlb_pte_copy(pte_t *t, bool ro)

{

	tlb_tag_access_reg_t tag;

	tlb_data_t data;

	page_address_t pg;

	frame_address_t fr;

	pg.address = t->page;

	fr.address = t->frame;

	tag.value = 0;

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

	tag.vpn = pg.vpn;

	dtlb_tag_access_write(tag.value);

	data.value = 0;

	data.v = true;

	data.size = PAGESIZE_8K;

	data.pfn = fr.pfn;

	data.l = false;

	data.cp = t->c;

	data.cv = t->c;

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

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

	data.g = t->g;

	dtlb_data_in_write(data.value);

}

void itlb_pte_copy(pte_t *t)

{

	tlb_tag_access_reg_t tag;

	tlb_data_t data;

	page_address_t pg;

	frame_address_t fr;

	pg.address = t->page;

	fr.address = t->frame;

	tag.value = 0;

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

	tag.vpn = pg.vpn;

	itlb_tag_access_write(tag.value);

	data.value = 0;

	data.v = true;

	data.size = PAGESIZE_8K;

	data.pfn = fr.pfn;

	data.l = false;

	data.cp = t->c;

	data.cv = t->c;

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

	data.w = false;

	data.g = t->g;

	itlb_data_in_write(data.value);

}

/** ITLB miss handler. */

void fast_instruction_access_mmu_miss(int n, istate_t *istate)

{

	uintptr_t va = ALIGN_DOWN(istate->tpc, PAGE_SIZE);

	pte_t *t;

	page_table_lock(AS, true);

	t = page_mapping_find(AS, va);

	if (t && PTE_EXECUTABLE(t)) {

		/*

		 * The mapping was found in the software page hash table.

		 * Insert it into ITLB.

		 */

		t->a = true;

		itlb_pte_copy(t);

		page_table_unlock(AS, true);

	} else {

		/*

		 * Forward the page fault to the address space page fault handler.

		 */		

		page_table_unlock(AS, true);

		if (as_page_fault(va, PF_ACCESS_EXEC, istate) == AS_PF_FAULT) {

			do_fast_instruction_access_mmu_miss_fault(istate, __FUNCTION__);

		}

	}

}

/** DTLB miss handler.

 *

 * Note that some faults (e.g. kernel faults) were already resolved

 * by the low-level, assembly language part of the fast_data_access_mmu_miss

 * handler.

 */

void fast_data_access_mmu_miss(int n, istate_t *istate)

{

	tlb_tag_access_reg_t tag;

	uintptr_t va;

	pte_t *t;

	tag.value = dtlb_tag_access_read();

	va = tag.vpn << PAGE_WIDTH;

	if (tag.context == ASID_KERNEL) {

		if (!tag.vpn) {

			/* NULL access in kernel */

			do_fast_data_access_mmu_miss_fault(istate, tag, __FUNCTION__);

		}

		do_fast_data_access_mmu_miss_fault(istate, tag, "Unexpected kernel page fault.");

	}

	page_table_lock(AS, true);

	t = page_mapping_find(AS, va);

	if (t) {

		/*

		 * The mapping was found in the software page hash table.

		 * Insert it into DTLB.

		 */

		t->a = true;

		dtlb_pte_copy(t, true);

		page_table_unlock(AS, true);

	} else {

		/*

		 * Forward the page fault to the address space page fault handler.

		 */		

		page_table_unlock(AS, true);

		if (as_page_fault(va, PF_ACCESS_READ, istate) == AS_PF_FAULT) {

			do_fast_data_access_mmu_miss_fault(istate, tag, __FUNCTION__);

		}

	}

}

/** DTLB protection fault handler. */

void fast_data_access_protection(int n, istate_t *istate)

{

	tlb_tag_access_reg_t tag;

	uintptr_t va;

	pte_t *t;

	tag.value = dtlb_tag_access_read();

	va = tag.vpn << PAGE_WIDTH;

	page_table_lock(AS, true);

	t = page_mapping_find(AS, va);

	if (t && PTE_WRITABLE(t)) {

		/*

		 * The mapping was found in the software page hash table and is writable.

		 * Demap the old mapping and insert an updated mapping into DTLB.

		 */

		t->a = true;

		t->d = true;

		dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_SECONDARY, va);

		dtlb_pte_copy(t, false);

		page_table_unlock(AS, true);

	} else {

		/*

		 * Forward the page fault to the address space page fault handler.

		 */		

		page_table_unlock(AS, true);

		if (as_page_fault(va, PF_ACCESS_WRITE, istate) == AS_PF_FAULT) {

			do_fast_data_access_protection_fault(istate, tag, __FUNCTION__);

		}

	}

}

/** Print contents of both TLBs. */

void tlb_print(void)

{

	int i;

	tlb_data_t d;

	tlb_tag_read_reg_t t;

	printf("I-TLB contents:\n");

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

		d.value = itlb_data_access_read(i);

		t.value = itlb_tag_read_read(i);

		printf("%d: vpn=%#llx, context=%d, v=%d, size=%d, nfo=%d, ie=%d, soft2=%#x, diag=%#x, pfn=%#x, soft=%#x, l=%d, cp=%d, cv=%d, e=%d, p=%d, w=%d, g=%d\n",

			i, t.vpn, t.context, d.v, d.size, d.nfo, d.ie, d.soft2, d.diag, d.pfn, d.soft, d.l, d.cp, d.cv, d.e, d.p, d.w, d.g);

	}

	printf("D-TLB contents:\n");

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

		d.value = dtlb_data_access_read(i);

		t.value = dtlb_tag_read_read(i);

		printf("%d: vpn=%#llx, context=%d, v=%d, size=%d, nfo=%d, ie=%d, soft2=%#x, diag=%#x, pfn=%#x, soft=%#x, l=%d, cp=%d, cv=%d, e=%d, p=%d, w=%d, g=%d\n",

			i, t.vpn, t.context, d.v, d.size, d.nfo, d.ie, d.soft2, d.diag, d.pfn, d.soft, d.l, d.cp, d.cv, d.e, d.p, d.w, d.g);

	}

}

void do_fast_instruction_access_mmu_miss_fault(istate_t *istate, const char *str)

{

	fault_if_from_uspace(istate, "%s\n", str);

	dump_istate(istate);

	panic("%s\n", str);

}

void do_fast_data_access_mmu_miss_fault(istate_t *istate, tlb_tag_access_reg_t tag, const char *str)

{

	uintptr_t va;

	va = tag.vpn << PAGE_WIDTH;

	fault_if_from_uspace(istate, "%s, Page=%p (ASID=%d)\n", str, va, tag.context);

	dump_istate(istate);

	printf("Faulting page: %p, ASID=%d\n", va, tag.context);

	panic("%s\n", str);

}

void do_fast_data_access_protection_fault(istate_t *istate, tlb_tag_access_reg_t tag, const char *str)

{

	uintptr_t va;

	va = tag.vpn << PAGE_WIDTH;

	fault_if_from_uspace(istate, "%s, Page=%p (ASID=%d)\n", str, va, tag.context);

	printf("Faulting page: %p, ASID=%d\n", va, tag.context);

	dump_istate(istate);

	panic("%s\n", str);

}

/** Invalidate all unlocked ITLB and DTLB entries. */

void tlb_invalidate_all(void)

{

	int i;

	tlb_data_t d;

	tlb_tag_read_reg_t t;

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

		d.value = itlb_data_access_read(i);

		if (!d.l) {

			t.value = itlb_tag_read_read(i);

			d.v = false;

			itlb_tag_access_write(t.value);

			itlb_data_access_write(i, d.value);

		}

	}

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

		d.value = dtlb_data_access_read(i);

		if (!d.l) {

			t.value = dtlb_tag_read_read(i);

			d.v = false;

			dtlb_tag_access_write(t.value);

			dtlb_data_access_write(i, d.value);

		}

	}

}

/** Invalidate all ITLB and DTLB entries that belong to specified ASID (Context).

 *

 * @param asid Address Space ID.

 */

void tlb_invalidate_asid(asid_t asid)

{

	tlb_context_reg_t pc_save, ctx;

	/* switch to nucleus because we are mapped by the primary context */

	nucleus_enter();

	ctx.v = pc_save.v = mmu_primary_context_read();

	ctx.context = asid;

	mmu_primary_context_write(ctx.v);

	itlb_demap(TLB_DEMAP_CONTEXT, TLB_DEMAP_PRIMARY, 0);

	dtlb_demap(TLB_DEMAP_CONTEXT, TLB_DEMAP_PRIMARY, 0);

	mmu_primary_context_write(pc_save.v);

	nucleus_leave();

}

/** Invalidate all ITLB and DTLB entries for specified page range in specified address space.

 *

 * @param asid Address Space ID.

 * @param page First page which to sweep out from ITLB and DTLB.

 * @param cnt Number of ITLB and DTLB entries to invalidate.

 */

void tlb_invalidate_pages(asid_t asid, uintptr_t page, count_t cnt)

{

	int i;

	tlb_context_reg_t pc_save, ctx;

	/* switch to nucleus because we are mapped by the primary context */

	nucleus_enter();

	ctx.v = pc_save.v = mmu_primary_context_read();

	ctx.context = asid;

	mmu_primary_context_write(ctx.v);

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

		itlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_PRIMARY, page + i * PAGE_SIZE);

		dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_PRIMARY, page + i * PAGE_SIZE);

	}

	mmu_primary_context_write(pc_save.v);

	nucleus_leave();

}

/** @}

 */