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#

# Copyright (C) 2005 Jakub Vana

# 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.

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# 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

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#

#include <arch/stack.h>

#include <arch/register.h>

#include <arch/mm/page.h>

#include <align.h>

#define STACK_ITEMS		14

#define STACK_FRAME_SIZE	ALIGN_UP((STACK_ITEMS*STACK_ITEM_SIZE) + STACK_SCRATCH_AREA_SIZE, STACK_ALIGNMENT)

#if (STACK_ITEMS % 2 == 0)

#	define STACK_FRAME_BIAS	8

#else

#	define STACK_FRAME_BIAS 16

#endif

/** Partitioning of bank 0 registers. */

#define R_OFFS 		r16

#define R_HANDLER	r17

#define R_RET		r18

#define R_KSTACK	r23	/* keep in sync with before_thread_runs_arch() */

/** Heavyweight interrupt handler

 *

 * This macro roughly follows steps from 1 to 19 described in

 * Intel Itanium Architecture Software Developer's Manual, Chapter 3.4.2.

 *

 * HEAVYWEIGHT_HANDLER macro must cram into 16 bundles (48 instructions).

 * This goal is achieved by using procedure calls after RSE becomes operational.

 *

 * Some steps are skipped (enabling and disabling interrupts).

 * Some steps are not fully supported yet (e.g. interruptions

 * from userspace and floating-point context).

 *

 * @param offs Offset from the beginning of IVT.

 * @param handler Interrupt handler address.

 */

.macro HEAVYWEIGHT_HANDLER offs, handler=universal_handler

    .org ivt + \offs

	mov R_OFFS = \offs

	movl R_HANDLER = \handler ;;

	br heavyweight_handler

.endm

.global heavyweight_handler

heavyweight_handler:

    /* 1. copy interrupt registers into bank 0 */

	/*

	 * Note that r24-r31 from bank 0 can be used only as long as PSR.ic = 0.

	 */

	mov r24 = cr.iip

	mov r25 = cr.ipsr

	mov r26 = cr.iipa

	mov r27 = cr.isr

	mov r28 = cr.ifa

    /* 2. preserve predicate register into bank 0 */

	mov r29 = pr ;;

    /* 3. switch to kernel memory stack */

    	mov r30 = cr.ipsr

	shr.u r31 = r12, VRN_SHIFT ;; 

	/*

	 * Set p6 to true if the stack register references kernel address space.

	 * Set p7 to false if the stack register doesn't reference kernel address space.

	 */

	cmp.eq p6, p7 = VRN_KERNEL, r31 ;;

	(p6) shr.u r30 = r30, PSR_CPL_SHIFT ;;

	(p6) and r30 = PSR_CPL_MASK_SHIFTED, r30 ;;

	/*

	 * Set p6 to true if the interrupted context executed in kernel mode.

	 * Set p7 to false if the interrupted context didn't execute in kernel mode.

	 */

	(p6) cmp.eq p6, p7 = r30, r0 ;;

	/*

	 * Now, p7 is true iff the stack needs to be switched to kernel stack.

	 */

	mov r30 = r12

	(p7) mov r12 = R_KSTACK ;;

	add r31 = -STACK_FRAME_BIAS, r12 ;;

	add r12 = -STACK_FRAME_SIZE, r12

    /* 4. save registers in bank 0 into memory stack */	

	st8 [r31] = r30, -8 ;;		/* save old stack pointer */ 

	st8 [r31] = r29, -8 ;;		/* save predicate registers */

	st8 [r31] = r24, -8 ;;		/* save cr.iip */

	st8 [r31] = r25, -8 ;;		/* save cr.ipsr */

	st8 [r31] = r26, -8 ;;		/* save cr.iipa */

	st8 [r31] = r27, -8 ;;		/* save cr.isr */

	st8 [r31] = r28, -8 ;;		/* save cr.ifa */

    /* 5. RSE switch from interrupted context */

	mov r24 = ar.rsc

	mov r25 = ar.pfs

	cover

	mov r26 = cr.ifs

	st8 [r31] = r24, -8 ;;	/* save ar.rsc */

	st8 [r31] = r25, -8 ;;	/* save ar.pfs */

	st8 [r31] = r26, -8	/* save ar.ifs */

	and r30 = ~3, r24 ;;

	mov ar.rsc = r30 ;;	/* place RSE in enforced lazy mode */

	mov r27 = ar.rnat

	mov r28 = ar.bspstore ;;

	/* assume kernel backing store */

	mov ar.bspstore = r28 ;;

	mov r29 = ar.bsp

	st8 [r31] = r27, -8 ;;	/* save ar.rnat */

	st8 [r31] = r28, -8 ;;	/* save new value written to ar.bspstore */

	st8 [r31] = r28, -8 ;;	/* save ar.bspstore */

	st8 [r31] = r29, -8 	/* save ar.bsp */

	mov ar.rsc = r24	/* restore RSE's setting */

    /* steps 6 - 15 are done by heavyweight_handler_inner() */

	mov R_RET = b0 		/* save b0 belonging to interrupted context */

	br.call.sptk.many b0 = heavyweight_handler_inner

0:	mov b0 = R_RET		/* restore b0 belonging to the interrupted context */

    /* 16. RSE switch to interrupted context */

	cover			/* allocate zerro size frame (step 1 (from Intel Docs)) */

	add r31 = STACK_SCRATCH_AREA_SIZE, r12 ;;

	ld8 r30 = [r31], +8 ;;		/* load ar.bsp */

	ld8 r29 = [r31], +8 ;;   	/* load ar.bspstore */

	ld8 r28 = [r31], +8 ;;   	/* load ar.bspstore_new */

	sub r27 = r30 , r28 ;;		/* calculate loadrs (step 2) */

	shl r27 = r27, 16

	mov r24 = ar.rsc ;;

	and r30 = ~3, r24 ;;

	or  r24 = r30 , r27 ;;     

	mov ar.rsc = r24 ;;		/* place RSE in enforced lazy mode */

	loadrs 				/* (step 3) */

	ld8 r27 = [r31], +8 ;;		/* load ar.rnat */

	ld8 r26 = [r31], +8 ;;		/* load cr.ifs */

	ld8 r25 = [r31], +8 ;;		/* load ar.pfs */

	ld8 r24 = [r31], +8 ;;		/* load ar.rsc */

	mov ar.bspstore = r29 ;;	/* (step 4) */

	mov ar.rnat = r27		/* (step 5) */

	mov ar.pfs = r25		/* (step 6) */

	mov cr.ifs = r26	

	mov ar.rsc = r24		/* (step 7) */

    /* 17. restore interruption state from memory stack */

	ld8 r28 = [r31], +8 ;;	/* load cr.ifa */		

	ld8 r27 = [r31], +8 ;;	/* load cr.isr */

	ld8 r26 = [r31], +8 ;;	/* load cr.iipa */

	ld8 r25 = [r31], +8 ;;	/* load cr.ipsr */

	ld8 r24 = [r31], +8 ;;	/* load cr.iip */

	mov cr.iip = r24

	mov cr.ipsr = r25

	mov cr.iipa = r26

	mov cr.isr = r27

	mov cr.ifa = r28

    /* 18. restore predicate registers from memory stack */

	ld8 r29 = [r31], +8 ;;	/* load predicate registers */

	mov pr = r29

    /* 19. return from interruption */

    	ld8 r12 = [r31]		/* load stack pointer */ 

	rfi ;;

.global heavyweight_handler_inner

heavyweight_handler_inner:

	/*

	 * From this point, the rest of the interrupted context

	 * will be preserved in stacked registers and backing store.

	 */

	alloc loc0 = ar.pfs, 0, 47, 2, 0 ;;

	/* bank 0 is going to be shadowed, copy essential data from there */

	mov loc1 = R_RET	/* b0 belonging to interrupted context */

	mov loc2 = R_HANDLER

	mov out0 = R_OFFS

	add out1 = STACK_SCRATCH_AREA_SIZE, r12

    /* 6. switch to bank 1 and reenable PSR.ic */

	ssm PSR_IC_MASK

	bsw.1 ;;

	srlz.d

    /* 7. preserve branch and application registers */

    	mov loc3 = ar.unat

	mov loc4 = ar.lc

	mov loc5 = ar.ec

	mov loc6 = ar.ccv

	mov loc7 = ar.csd

	mov loc8 = ar.ssd

	mov loc9 = b0

	mov loc10 = b1

	mov loc11 = b2

	mov loc12 = b3

	mov loc13 = b4

	mov loc14 = b5

	mov loc15 = b6

	mov loc16 = b7

    /* 8. preserve general and floating-point registers */

	/* TODO: save floating-point context */

	mov loc17 = r1

	mov loc18 = r2

	mov loc19 = r3

	mov loc20 = r4

	mov loc21 = r5

	mov loc22 = r6

	mov loc23 = r7

	mov loc24 = r8

	mov loc25 = r9

	mov loc26 = r10

	mov loc27 = r11

	/* skip r12 (stack pointer) */

	mov loc28 = r13

	mov loc29 = r14

	mov loc30 = r15

	mov loc31 = r16

	mov loc32 = r17

	mov loc33 = r18

	mov loc34 = r19

	mov loc35 = r20

	mov loc36 = r21

	mov loc37 = r22

	mov loc38 = r23

	mov loc39 = r24

	mov loc40 = r25

	mov loc41 = r26

	mov loc42 = r27

	mov loc43 = r28

	mov loc44 = r29

	mov loc45 = r30

	mov loc46 = r31

    /* 9. skipped (will not enable interrupts) */

	/*

    	 * ssm PSR_I_MASK

	 * ;;

	 * srlz.d

	 */

    /* 10. call handler */

    	mov b1 = loc2

	br.call.sptk.many b0 = b1

    /* 11. return from handler */

0:

    /* 12. skipped (will not disable interrupts) */

	/*

    	 * rsm PSR_I_MASK

	 * ;;

	 * srlz.d

	 */

    /* 13. restore general and floating-point registers */

	/* TODO: restore floating-point context */

	mov r1 = loc17

	mov r2 = loc18

	mov r3 = loc19

	mov r4 = loc20

	mov r5 = loc21

	mov r6 = loc22

	mov r7 = loc23

	mov r8 = loc24

	mov r9 = loc25

	mov r10 = loc26

	mov r11 = loc27

	/* skip r12 (stack pointer) */

	mov r13 = loc28

	mov r14 = loc29

	mov r15 = loc30

	mov r16 = loc31

	mov r17 = loc32

	mov r18 = loc33

	mov r19 = loc34

	mov r20 = loc35

	mov r21 = loc36

	mov r22 = loc37

	mov r23 = loc38

	mov r24 = loc39

	mov r25 = loc40

	mov r26 = loc41 

	mov r27 = loc42

	mov r28 = loc43

	mov r29 = loc44

	mov r30 = loc45

	mov r31 = loc46

    /* 14. restore branch and application registers */

    	mov ar.unat = loc3

	mov ar.lc = loc4

	mov ar.ec = loc5

	mov ar.ccv = loc6

	mov ar.csd = loc7

	mov ar.ssd = loc8

	mov b0 = loc9

	mov b1 = loc10

	mov b2 = loc11

	mov b3 = loc12

	mov b4 = loc13

	mov b5 = loc14

	mov b6 = loc15

	mov b7 = loc16

    /* 15. disable PSR.ic and switch to bank 0 */

	rsm PSR_IC_MASK

	bsw.0 ;;

	srlz.d

	mov R_RET = loc1

	mov ar.pfs = loc0

	br.ret.sptk.many b0

.global ivt

.align 32768

ivt:

	HEAVYWEIGHT_HANDLER 0x0000

	HEAVYWEIGHT_HANDLER 0x0400

	HEAVYWEIGHT_HANDLER 0x0800

	HEAVYWEIGHT_HANDLER 0x0c00 alternate_instruction_tlb_fault

	HEAVYWEIGHT_HANDLER 0x1000 alternate_data_tlb_fault

	HEAVYWEIGHT_HANDLER 0x1400 data_nested_tlb_fault

	HEAVYWEIGHT_HANDLER 0x1800

	HEAVYWEIGHT_HANDLER 0x1c00

	HEAVYWEIGHT_HANDLER 0x2000 data_dirty_bit_fault

	HEAVYWEIGHT_HANDLER 0x2400 instruction_access_bit_fault

	HEAVYWEIGHT_HANDLER 0x2800 data_access_bit_fault

	HEAVYWEIGHT_HANDLER 0x2c00 break_instruction

	HEAVYWEIGHT_HANDLER 0x3000 external_interrupt	/* For external interrupt, heavyweight handler is used. */

	HEAVYWEIGHT_HANDLER 0x3400

	HEAVYWEIGHT_HANDLER 0x3800

	HEAVYWEIGHT_HANDLER 0x3c00

	HEAVYWEIGHT_HANDLER 0x4000

	HEAVYWEIGHT_HANDLER 0x4400

	HEAVYWEIGHT_HANDLER 0x4800

	HEAVYWEIGHT_HANDLER 0x4c00

	HEAVYWEIGHT_HANDLER 0x5000 page_not_present

	HEAVYWEIGHT_HANDLER 0x5100

	HEAVYWEIGHT_HANDLER 0x5200

	HEAVYWEIGHT_HANDLER 0x5300

	HEAVYWEIGHT_HANDLER 0x5400 general_exception

	HEAVYWEIGHT_HANDLER 0x5500

	HEAVYWEIGHT_HANDLER 0x5600

	HEAVYWEIGHT_HANDLER 0x5700

	HEAVYWEIGHT_HANDLER 0x5800

	HEAVYWEIGHT_HANDLER 0x5900

	HEAVYWEIGHT_HANDLER 0x5a00

	HEAVYWEIGHT_HANDLER 0x5b00

	HEAVYWEIGHT_HANDLER 0x5c00

	HEAVYWEIGHT_HANDLER 0x5d00

	HEAVYWEIGHT_HANDLER 0x5e00

	HEAVYWEIGHT_HANDLER 0x5f00

	HEAVYWEIGHT_HANDLER 0x6000

	HEAVYWEIGHT_HANDLER 0x6100

	HEAVYWEIGHT_HANDLER 0x6200

	HEAVYWEIGHT_HANDLER 0x6300

	HEAVYWEIGHT_HANDLER 0x6400

	HEAVYWEIGHT_HANDLER 0x6500

	HEAVYWEIGHT_HANDLER 0x6600

	HEAVYWEIGHT_HANDLER 0x6700

	HEAVYWEIGHT_HANDLER 0x6800

	HEAVYWEIGHT_HANDLER 0x6900

	HEAVYWEIGHT_HANDLER 0x6a00

	HEAVYWEIGHT_HANDLER 0x6b00

	HEAVYWEIGHT_HANDLER 0x6c00

	HEAVYWEIGHT_HANDLER 0x6d00

	HEAVYWEIGHT_HANDLER 0x6e00

	HEAVYWEIGHT_HANDLER 0x6f00

	HEAVYWEIGHT_HANDLER 0x7000

	HEAVYWEIGHT_HANDLER 0x7100

	HEAVYWEIGHT_HANDLER 0x7200

	HEAVYWEIGHT_HANDLER 0x7300

	HEAVYWEIGHT_HANDLER 0x7400

	HEAVYWEIGHT_HANDLER 0x7500

	HEAVYWEIGHT_HANDLER 0x7600

	HEAVYWEIGHT_HANDLER 0x7700

	HEAVYWEIGHT_HANDLER 0x7800

	HEAVYWEIGHT_HANDLER 0x7900

	HEAVYWEIGHT_HANDLER 0x7a00

	HEAVYWEIGHT_HANDLER 0x7b00

	HEAVYWEIGHT_HANDLER 0x7c00

	HEAVYWEIGHT_HANDLER 0x7d00

	HEAVYWEIGHT_HANDLER 0x7e00

	HEAVYWEIGHT_HANDLER 0x7f00