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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/s390/kernel/head64.S
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/*

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 * arch/s390/kernel/head64.S

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 *

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 * Copyright (C) IBM Corp. 1999,2010

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 *

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 *   Author(s):	Hartmut Penner <[email protected]>

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 *		Martin Schwidefsky <[email protected]>

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 *		Rob van der Heij <[email protected]>

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 *		Heiko Carstens <[email protected]>

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 *

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 */

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#include <linux/init.h>

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#include <asm/asm-offsets.h>

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#include <asm/thread_info.h>

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#include <asm/page.h>

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__HEAD

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	.globl	startup_continue

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startup_continue:

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	larl	%r1,sched_clock_base_cc

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	mvc	0(8,%r1),__LC_LAST_UPDATE_CLOCK

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	larl	%r13,.LPG1		# get base

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	lctlg	%c0,%c15,.Lctl-.LPG1(%r13)	# load control registers

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	lg	%r12,.Lparmaddr-.LPG1(%r13)	# pointer to parameter area

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					# move IPL device to lowcore

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	lghi	%r0,__LC_PASTE

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	stg	%r0,__LC_VDSO_PER_CPU

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#

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# Setup stack

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#

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	larl	%r15,init_thread_union

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	stg	%r15,__LC_THREAD_INFO	# cache thread info in lowcore

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	lg	%r14,__TI_task(%r15)	# cache current in lowcore

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	stg	%r14,__LC_CURRENT

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	aghi	%r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union + THREAD_SIZE

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	stg	%r15,__LC_KERNEL_STACK	# set end of kernel stack

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	aghi	%r15,-160

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#

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# Save ipl parameters, clear bss memory, initialize storage key for kernel pages,

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# and create a kernel NSS if the SAVESYS= parm is defined

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#

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	brasl	%r14,startup_init

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	lpswe	.Lentry-.LPG1(13)	# jump to _stext in primary-space,

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					# virtual and never return ...

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	.align	16

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.LPG1:

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.Lentry:.quad	0x0000000180000000,_stext

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.Lctl:	.quad	0x04350002		# cr0: various things

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	.quad	0			# cr1: primary space segment table

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	.quad	.Lduct			# cr2: dispatchable unit control table

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	.quad	0			# cr3: instruction authorization

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	.quad	0			# cr4: instruction authorization

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	.quad	.Lduct			# cr5: primary-aste origin

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	.quad	0			# cr6:	I/O interrupts

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	.quad	0			# cr7:	secondary space segment table

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	.quad	0			# cr8:	access registers translation

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	.quad	0			# cr9:	tracing off

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	.quad	0			# cr10: tracing off

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	.quad	0			# cr11: tracing off

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	.quad	0			# cr12: tracing off

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	.quad	0			# cr13: home space segment table

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	.quad	0xc0000000		# cr14: machine check handling off

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	.quad	0			# cr15: linkage stack operations

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.Lpcmsk:.quad	0x0000000180000000

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.L4malign:.quad 0xffffffffffc00000

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.Lscan2g:.quad	0x80000000 + 0x20000 - 8	# 2GB + 128K - 8

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.Lnop:	.long	0x07000700

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.Lparmaddr:

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	.quad	PARMAREA

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	.align	64

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.Lduct: .long	0,0,0,0,.Lduald,0,0,0

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	.long	0,0,0,0,0,0,0,0

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	.align	128

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.Lduald:.rept	8

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	.long	0x80000000,0,0,0	# invalid access-list entries

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	.endr

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	.globl	_ehead

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_ehead:

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#ifdef CONFIG_SHARED_KERNEL

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	.org	0x100000 - 0x11000	# head.o ends at 0x11000

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#endif

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#

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# startup-code, running in absolute addressing mode

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#

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	.globl	_stext

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_stext:	basr	%r13,0			# get base

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.LPG3:

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# check control registers

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	stctg	%c0,%c15,0(%r15)

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	oi	6(%r15),0x40		# enable sigp emergency signal

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	oi	4(%r15),0x10		# switch on low address proctection

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	lctlg	%c0,%c15,0(%r15)

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	lam	0,15,.Laregs-.LPG3(%r13)	# load acrs needed by uaccess

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	brasl	%r14,start_kernel	# go to C code

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#

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# We returned from start_kernel ?!? PANIK

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#

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	basr	%r13,0

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	lpswe	.Ldw-.(%r13)		# load disabled wait psw

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	.align	8

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.Ldw:	.quad	0x0002000180000000,0x0000000000000000

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.Laregs:.long	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0

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