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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

#define KERNEL_TRANSLATION_VIO	0x0010000000000671

#define KERNEL_TRANSLATION_IO	0x00100FFFFC000671 

#define KERNEL_TRANSLATION_FW	0x00100000F0000671 

.section K_TEXT_START, "ax"

.global kernel_image_start

stack0:

kernel_image_start:

	.auto

#ifdef CONFIG_SMP

	# Identify self(CPU) in OS structures by ID / EID

	mov r9 = cr64

	mov r10 = 1

	movl r12 = 0xffffffff

	movl r8 = cpu_by_id_eid_list

	and r8 = r8, r12

	shr r9 = r9, 16

	add r8 = r8, r9

	st1 [r8] = r10

#endif

	mov psr.l = r0

	srlz.i

	srlz.d

	# 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

	mov r11 = cr.itir

	movl r10 = (KERNEL_PAGE_WIDTH << PS_SHIFT)

	or r10 = r10, r11

	mov cr.itir = r10

	movl r10 = (KERNEL_TRANSLATION_I)

	itr.i itr[r0] = r10

	movl r10 = (KERNEL_TRANSLATION_D)

	itr.d dtr[r0] = r10

	movl r7 = 1

	movl r8 = (VRN_KERNEL << VRN_SHIFT) | VIO_OFFSET

	mov cr.ifa = r8

	movl r10 = (KERNEL_TRANSLATION_VIO)

	itr.d dtr[r7] = r10

	mov r11 = cr.itir

	movl r10 = ~0xfc

	and r10 = r10, r11

	movl r11 = (IO_PAGE_WIDTH << PS_SHIFT)

	or r10 = r10, r11

	mov cr.itir = r10

	movl r7 = 2

	movl r8 = (VRN_KERNEL << VRN_SHIFT) | IO_OFFSET

	mov cr.ifa = r8

	movl r10 = (KERNEL_TRANSLATION_IO)

	itr.d dtr[r7] = r10

	# Setup mapping for fimware arrea (also SAPIC)

	mov r11 = cr.itir

	movl r10 = ~0xfc

	and r10 = r10, r11

	movl r11 = (FW_PAGE_WIDTH << PS_SHIFT)

	or r10 = r10, r11

	mov cr.itir = r10

	movl r7 = 3

	movl r8 = (VRN_KERNEL << VRN_SHIFT) | FW_OFFSET

	mov cr.ifa = r8

	movl r10 = (KERNEL_TRANSLATION_FW)

	itr.d dtr[r7] = r10

	# Initialize PSR

	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 Interrupt is the only way to

	 * fill the upper half word of PSR.

	 */

	rfi ;;

.global paging_start

paging_start:

	/*

	 * Now we are paging.

	 */

	# Switch to register bank 1

	bsw.1

#ifdef CONFIG_SMP

	# Am I BSP or AP?

	movl r20 = bsp_started ;;

	ld8 r20 = [r20] ;;

	cmp.eq p3, p2 = r20, r0 ;;

#else

	cmp.eq p3, p2 = r0, r0 ;;	/* you are BSP */

#endif	/* CONFIG_SMP */

	# 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 r20 = (VRN_KERNEL << VRN_SHIFT);;

	or r20 = r20,r1;;

	movl r1 = _hardcoded_load_address

	/*

	 * Initialize hardcoded_* variables. Do only BSP

	 */

(p3)	movl r14 = _hardcoded_ktext_size

(p3)	movl r15 = _hardcoded_kdata_size

(p3)	movl r16 = _hardcoded_load_address ;;

(p3)	addl r17 = @gprel(hardcoded_ktext_size), gp

(p3)	addl r18 = @gprel(hardcoded_kdata_size), gp

(p3)	addl r19 = @gprel(hardcoded_load_address), gp

(p3)	addl r21 = @gprel(bootinfo), gp

	;;

(p3)	st8 [r17] = r14

(p3)	st8 [r18] = r15

(p3)	st8 [r19] = r16

(p3)	st8 [r21] = r20

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

	srlz.i

	srlz.d ;;

#ifdef CONFIG_SMP

(p2)	movl r18 = main_ap ;;

(p2)   	mov b1 = r18 ;;

(p2)	br.call.sptk.many b0 = b1

	# Mark that BSP is on

	mov r20 = 1 ;;

	movl r21 = bsp_started ;;

	st8 [r21] = r20 ;;

#endif

	br.call.sptk.many b0 = arch_pre_main

	movl r18 = main_bsp ;;

	mov b1 = r18 ;;

	br.call.sptk.many b0 = b1

0:

	br 0b

#ifdef CONFIG_SMP

.align 4096

kernel_image_ap_start:

	.auto

	# Identify self(CPU) in OS structures by ID / EID

	mov r9 = cr64

	mov r10 = 1

	movl r12 = 0xffffffff

	movl r8 = cpu_by_id_eid_list

	and r8 = r8, r12

	shr r9 = r9, 16

	add r8 = r8, r9

	st1 [r8] = r10

	# Wait for wakeup synchro signal (#3 in cpu_by_id_eid_list)

kernel_image_ap_start_loop:

	movl r11 = kernel_image_ap_start_loop

	and r11 = r11, r12

   	mov b1 = r11 

	ld1 r20 = [r8] ;;

	movl r21 = 3 ;;

	cmp.eq p2, p3 = r20, r21 ;;

(p3)	br.call.sptk.many b0 = b1

	movl r11 = kernel_image_start

	and r11 = r11, r12

	mov b1 = r11 

	br.call.sptk.many b0 = b1

.align 16

.global bsp_started

bsp_started:

.space 8

.align 4096

.global cpu_by_id_eid_list

cpu_by_id_eid_list:

.space 65536

#endif	/* CONFIG_SMP */