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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/interrupt.h>

#include <print.h>

#include <debug.h>

#include <panic.h>

#include <arch/i8259.h>

#include <func.h>

#include <cpu.h>

#include <arch/asm.h>

#include <mm/tlb.h>

#include <mm/as.h>

#include <arch.h>

#include <symtab.h>

#include <arch/asm.h>

#include <proc/scheduler.h>

#include <proc/thread.h>

static void print_info_errcode(int n, istate_t *istate)

{

	char *symbol;

	__u64 *x = &istate->stack[0];

	if (!(symbol=get_symtab_entry(istate->rip)))

		symbol = "";

	printf("-----EXCEPTION(%d) OCCURED----- ( %s )\n",n, __FUNCTION__);

	printf("%%rip: %Q (%s)\n",istate->rip, symbol);

	printf("ERROR_WORD=%Q\n", istate->error_word);

	printf("%%rcs=%Q, flags=%Q, %%cr0=%Q\n", istate->cs, istate->rflags,read_cr0());

	printf("%%rax=%Q, %%rbx=%Q, %%rcx=%Q\n",istate->rax,istate->rbx,istate->rcx);

	printf("%%rdx=%Q, %%rsi=%Q, %%rdi=%Q\n",istate->rdx,istate->rsi,istate->rdi);

	printf("%%r8 =%Q, %%r9 =%Q, %%r10=%Q\n",istate->r8,istate->r9,istate->r10);

	printf("%%r11=%Q, %%r12=%Q, %%r13=%Q\n",istate->r11,istate->r12,istate->r13);

	printf("%%r14=%Q, %%r15=%Q, %%rsp=%Q\n",istate->r14,istate->r15,&istate->stack[0]);

	printf("%%rbp=%Q\n",istate->rbp);

	printf("stack: %Q, %Q, %Q\n", x[5], x[6], x[7]);

	printf("       %Q, %Q, %Q\n", x[8], x[9], x[10]);

	printf("       %Q, %Q, %Q\n", x[11], x[12], x[13]);

	printf("       %Q, %Q, %Q\n", x[14], x[15], x[16]);

}

/*

 * Interrupt and exception dispatching.

 */

void (* disable_irqs_function)(__u16 irqmask) = NULL;

void (* enable_irqs_function)(__u16 irqmask) = NULL;

void (* eoi_function)(void) = NULL;

void null_interrupt(int n, istate_t *istate)

{

	print_info_errcode(n, istate);

	panic("unserviced interrupt\n");

}

void gp_fault(int n, istate_t *istate)

{

	print_info_errcode(n, istate);

	panic("general protection fault\n");

}

void ss_fault(int n, istate_t *istate)

{

	print_info_errcode(n, istate);

	panic("stack fault\n");

}

void nm_fault(int n, istate_t *istate)

{

#ifdef CONFIG_FPU_LAZY     

	scheduler_fpu_lazy_request();

#else

	panic("fpu fault");

#endif

}

/* Definitions for identic 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); \

    }

/** Identic 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");

	}

}

void tlb_shootdown_ipi(int n, istate_t *istate)

{

	trap_virtual_eoi();

	tlb_shootdown_ipi_recv();

}

void trap_virtual_enable_irqs(__u16 irqmask)

{

	if (enable_irqs_function)

		enable_irqs_function(irqmask);

	else

		panic("no enable_irqs_function\n");

}

void trap_virtual_disable_irqs(__u16 irqmask)

{

	if (disable_irqs_function)

		disable_irqs_function(irqmask);

	else

		panic("no disable_irqs_function\n");

}

void trap_virtual_eoi(void)

{

	if (eoi_function)

		eoi_function();

	else

		panic("no eoi_function\n");

}