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/*

 * Copyright (C) 2001-2004 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.

 */

#include <arch/mm/page.h>

#include <genarch/mm/page_pt.h>

#include <arch/mm/frame.h>

#include <mm/page.h>

#include <mm/frame.h>

#include <mm/as.h>

#include <arch/interrupt.h>

#include <arch/asm.h>

#include <config.h>

#include <memstr.h>

#include <interrupt.h>

#include <print.h>

#include <panic.h>

/* Definitions for identity page mapper */

pte_t helper_ptl1[512] __attribute__((aligned (PAGE_SIZE)));

pte_t helper_ptl2[512] __attribute__((aligned (PAGE_SIZE)));

pte_t helper_ptl3[512] __attribute__((aligned (PAGE_SIZE)));

extern pte_t ptl_0; /* From boot.S */

#define PTL1_PRESENT(ptl0, page) (!(GET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))

#define PTL2_PRESENT(ptl1, page) (!(GET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))

#define PTL3_PRESENT(ptl2, page) (!(GET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page)) & PAGE_NOT_PRESENT))

#define PTL1_ADDR(ptl0, page) ((pte_t *)PA2KA(GET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page))))

#define PTL2_ADDR(ptl1, page) ((pte_t *)PA2KA(GET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page))))

#define PTL3_ADDR(ptl2, page) ((pte_t *)PA2KA(GET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page))))

#define SETUP_PTL1(ptl0, page, tgt)  {	\

	SET_PTL1_ADDRESS_ARCH(ptl0, PTL0_INDEX_ARCH(page), (__address)KA2PA(tgt)); \

        SET_PTL1_FLAGS_ARCH(ptl0, PTL0_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \

    }

#define SETUP_PTL2(ptl1, page, tgt)  {	\

	SET_PTL2_ADDRESS_ARCH(ptl1, PTL1_INDEX_ARCH(page), (__address)KA2PA(tgt)); \

        SET_PTL2_FLAGS_ARCH(ptl1, PTL1_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \

    }

#define SETUP_PTL3(ptl2, page, tgt)  {	\

	SET_PTL3_ADDRESS_ARCH(ptl2, PTL2_INDEX_ARCH(page), (__address)KA2PA(tgt)); \

        SET_PTL3_FLAGS_ARCH(ptl2, PTL2_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \

    }

#define SETUP_FRAME(ptl3, page, tgt)  {	\

	SET_FRAME_ADDRESS_ARCH(ptl3, PTL3_INDEX_ARCH(page), (__address)KA2PA(tgt)); \

        SET_FRAME_FLAGS_ARCH(ptl3, PTL3_INDEX_ARCH(page), PAGE_WRITE | PAGE_EXEC); \

    }

void page_arch_init(void)

{

	__address cur;

	int flags;

	if (config.cpu_active == 1) {

		page_mapping_operations = &pt_mapping_operations;

		/*

		 * PA2KA(identity) mapping for all frames.

		 */

		for (cur = 0; cur < last_frame; cur += FRAME_SIZE) {

			flags = PAGE_CACHEABLE | PAGE_EXEC;

			if ((PA2KA(cur) >= config.base) && (PA2KA(cur) < config.base + config.kernel_size))

				flags |= PAGE_GLOBAL;

			page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);

		}

		exc_register(14, "page_fault", (iroutine)page_fault);

		write_cr3((__address) AS_KERNEL->page_table);

	}

	else {

		write_cr3((__address) AS_KERNEL->page_table);

	}

}

/** Identity page mapper

 *

 * We need to map whole physical memory identically before the page subsystem

 * is initializaed. This thing clears page table and fills in the specific

 * items.

 */

void ident_page_fault(int n, istate_t *istate)

{

	__address page;

	static __address oldpage = 0;

	pte_t *aptl_1, *aptl_2, *aptl_3;

	page = read_cr2();

	if (oldpage) {

		/* Unmap old address */

		aptl_1 = PTL1_ADDR(&ptl_0, oldpage);

		aptl_2 = PTL2_ADDR(aptl_1, oldpage);

		aptl_3 = PTL3_ADDR(aptl_2, oldpage);

		SET_FRAME_FLAGS_ARCH(aptl_3, PTL3_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);

		if (aptl_3 == helper_ptl3)

			SET_PTL3_FLAGS_ARCH(aptl_2, PTL2_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);

		if (aptl_2 == helper_ptl2)

			SET_PTL2_FLAGS_ARCH(aptl_1, PTL1_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);

		if (aptl_1 == helper_ptl1)

			SET_PTL1_FLAGS_ARCH(&ptl_0, PTL0_INDEX_ARCH(oldpage), PAGE_NOT_PRESENT);

	}

	if (PTL1_PRESENT(&ptl_0, page))

		aptl_1 = PTL1_ADDR(&ptl_0, page);

	else {

		SETUP_PTL1(&ptl_0, page, helper_ptl1);

		aptl_1 = helper_ptl1;

	}

	if (PTL2_PRESENT(aptl_1, page)) 

		aptl_2 = PTL2_ADDR(aptl_1, page);

	else {

		SETUP_PTL2(aptl_1, page, helper_ptl2);

		aptl_2 = helper_ptl2;

	}

	if (PTL3_PRESENT(aptl_2, page))

		aptl_3 = PTL3_ADDR(aptl_2, page);

	else {

		SETUP_PTL3(aptl_2, page, helper_ptl3);

		aptl_3 = helper_ptl3;

	}

	SETUP_FRAME(aptl_3, page, page);

	oldpage = page;

}

void page_fault(int n, istate_t *istate)

{

	__address page;

	page = read_cr2();

	if (!as_page_fault(page)) {

		print_info_errcode(n, istate);

		printf("Page fault address: %Q\n", page);

		panic("page fault\n");

	}

}