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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.

#

#include <arch/register.h>

#include <arch/mm/page.h>

#include <arch/mm/asid.h>

#include <mm/asid.h>

#define RR_MASK (0xFFFFFFFF00000002)

#define RID_SHIFT 8

#define PS_SHIFT 2

#define KERNEL_TRANSLATION_I 0x0010000000000661

#define KERNEL_TRANSLATION_D 0x0010000000000661

.section K_TEXT_START, "ax"

.global kernel_image_start

stack0:

kernel_image_start:

	.auto

	# Fill TR.i and TR.d using Region Register #VRN_KERNEL

	movl r8 = (VRN_KERNEL << VRN_SHIFT)

	mov r9 = rr[r8]

	movl r10 = (RR_MASK)

	and r9 = r10, r9

	movl r10 = ((RID_KERNEL << RID_SHIFT) | (KERNEL_PAGE_WIDTH << PS_SHIFT))

	or  r9 = r10, r9

	mov rr[r8] = r9

	movl r8 = (VRN_KERNEL << VRN_SHIFT)

	mov cr.ifa = r8

	movl r10 = (KERNEL_PAGE_WIDTH << PS_SHIFT)

	mov cr.itir = r10

	movl r10 = (KERNEL_TRANSLATION_I)

	itr.i itr[r0] = r10

	movl r10 = (KERNEL_TRANSLATION_D)

	itr.d dtr[r0] = r10

	# initialize PSR

	mov psr.l = r0

	srlz.i

	srlz.d

	movl r10 = (PSR_DT_MASK | PSR_RT_MASK | PSR_IT_MASK | PSR_IC_MASK)  /* Enable paging */

	mov r9 = psr

	or r10 = r10, r9

	mov cr.ipsr = r10

	mov cr.ifs = r0

	movl r8 = paging_start

	mov cr.iip = r8

	srlz.d

	srlz.i

	.explicit

	/*

	 * Return From Interupt is the only the way to fill upper half word of PSR.

	 */

	rfi;;

.global paging_start

paging_start:

	/*

	 * Now we are paging.

	 */

	# switch to register bank 1

	bsw.1

	# initialize register stack

	mov ar.rsc = r0

	movl r8 = (VRN_KERNEL << VRN_SHIFT) ;;

	mov ar.bspstore = r8

	loadrs

	# initialize memory stack to some sane value

	movl r12 = stack0 ;;

	add r12 = -16, r12	/* allocate a scratch area on the stack */

	# initialize gp (Global Pointer) register

	movl r1 = _hardcoded_load_address

	/*

	 * Initialize hardcoded_* variables.

	 */

	movl r14 = _hardcoded_ktext_size

	movl r15 = _hardcoded_kdata_size

	movl r16 = _hardcoded_load_address ;;

	addl r17 = @gprel(hardcoded_ktext_size), gp

	addl r18 = @gprel(hardcoded_kdata_size), gp

	addl r19 = @gprel(hardcoded_load_address), gp

	;;

	st8 [r17] = r14

	st8 [r18] = r15

	st8 [r19] = r16

	ssm (1 << 19) ;; /* Disable f32 - f127 */

	srlz.i

	srlz.d ;;

	br.call.sptk.many b0 = arch_pre_main

	movl r18 = main_bsp ;;

	mov b1 = r18 ;;

	br.call.sptk.many b0 = b1

0:

	br 0b