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

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 * arch/s390/kernel/relocate_kernel.S

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 *

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 * (C) Copyright IBM Corp. 2005

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 *

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 * Author(s): Rolf Adelsberger,

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 *	      Heiko Carstens <[email protected]>

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 *

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 */

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/*

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 * moves the new kernel to its destination...

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 * %r2 = pointer to first kimage_entry_t

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 * %r3 = start address - where to jump to after the job is done...

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 *

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 * %r5 will be used as temp. storage

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 * %r6 holds the destination address

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 * %r7 = PAGE_SIZE

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 * %r8 holds the source address

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 * %r9 = PAGE_SIZE

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 * %r10 is a page mask

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 */

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	.text

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	.globl		relocate_kernel

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	relocate_kernel:

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		basr	%r13,0		# base address

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	.base:

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		stnsm	sys_msk-.base(%r13),0xfb	# disable DAT

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		stctl	%c0,%c15,ctlregs-.base(%r13)

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		stm	%r0,%r15,gprregs-.base(%r13)

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		la	%r1,load_psw-.base(%r13)

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		mvc	0(8,%r0),0(%r1)

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		la	%r0,.back-.base(%r13)

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		st	%r0,4(%r0)

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		oi	4(%r0),0x80

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		mvc	0x68(8,%r0),0(%r1)

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		la	%r0,.back_pgm-.base(%r13)

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		st	%r0,0x6c(%r0)

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		oi	0x6c(%r0),0x80

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		lhi	%r0,0

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		diag	%r0,%r0,0x308

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	.back:

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		basr	%r13,0

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	.back_base:

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		oi	have_diag308-.back_base(%r13),0x01

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		lctl	%c0,%c15,ctlregs-.back_base(%r13)

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		lm	%r0,%r15,gprregs-.back_base(%r13)

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		j	.start_reloc

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	.back_pgm:

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		lm	%r0,%r15,gprregs-.base(%r13)

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	.start_reloc:

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		lhi	%r10,-1		# preparing the mask

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		sll	%r10,12		# shift it such that it becomes 0xf000

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	.top:

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		lhi	%r7,4096	# load PAGE_SIZE in r7

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		lhi	%r9,4096	# load PAGE_SIZE in r9

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		l	%r5,0(%r2)	# read another word for indirection page

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		ahi	%r2,4		# increment pointer

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		tml	%r5,0x1		# is it a destination page?

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		je	.indir_check	# NO, goto "indir_check"

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		lr	%r6,%r5		# r6 = r5

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		nr	%r6,%r10	# mask it out and...

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		j	.top		# ...next iteration

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	.indir_check:

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		tml	%r5,0x2		# is it a indirection page?

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		je	.done_test	# NO, goto "done_test"

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		nr	%r5,%r10	# YES, mask out,

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		lr	%r2,%r5		# move it into the right register,

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		j	.top		# and read next...

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	.done_test:

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		tml	%r5,0x4		# is it the done indicator?

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		je	.source_test	# NO! Well, then it should be the source indicator...

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		j	.done		# ok, lets finish it here...

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	.source_test:

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		tml	%r5,0x8		# it should be a source indicator...

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		je	.top		# NO, ignore it...

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		lr	%r8,%r5		# r8 = r5

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		nr	%r8,%r10	# masking

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	0:	mvcle	%r6,%r8,0x0	# copy PAGE_SIZE bytes from r8 to r6 - pad with 0

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		jo	0b

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		j	.top

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	.done:

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		sr	%r0,%r0		# clear register r0

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		la	%r4,load_psw-.base(%r13)	# load psw-address into the register

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		o	%r3,4(%r4)	# or load address into psw

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		st	%r3,4(%r4)

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		mvc	0(8,%r0),0(%r4)	# copy psw to absolute address 0

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		tm	have_diag308-.base(%r13),0x01

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		jno	.no_diag308

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		diag	%r0,%r0,0x308

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	.no_diag308:

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		sr	%r1,%r1		# clear %r1

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		sr	%r2,%r2		# clear %r2

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		sigp	%r1,%r2,0x12	# set cpuid to zero

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		lpsw	0		# hopefully start new kernel...

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		.align	8

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	load_psw:

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		.long	0x00080000,0x80000000

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	sys_msk:

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		.quad	0

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	ctlregs:

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		.rept	16

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		.long	0

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		.endr

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	gprregs:

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		.rept	16

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		.long	0

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		.endr

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	have_diag308:

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		.byte	0

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		.align	8

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	relocate_kernel_end:

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	.globl	relocate_kernel_len

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	relocate_kernel_len:

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		.quad	relocate_kernel_end - relocate_kernel

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