/* SPDX-License-Identifier: GPL-2.0 *//* * Copyright IBM Corp. 2005 * * Author(s): Rolf Adelsberger * */ #include <linux/linkage.h>#include <asm/page.h>#include <asm/sigp.h> /* * moves the new kernel to its destination... * %r2 = pointer to first kimage_entry_t * %r3 = start address - where to jump to after the job is done... * %r4 = subcode * * %r5 will be used as temp. storage * %r6 holds the destination address * %r7 = PAGE_SIZE * %r8 holds the source address * %r9 = PAGE_SIZE * * 0xf000 is a page_mask */ 	.textSYM_CODE_START(relocate_kernel)	basr	%r13,0		# base address.base:	lghi	%r7,PAGE_SIZE	# load PAGE_SIZE in r7	lghi	%r9,PAGE_SIZE	# load PAGE_SIZE in r9	lg	%r5,0(%r2)	# read another word for indirection page	aghi	%r2,8		# increment pointer	tml	%r5,0x1		# is it a destination page?	je	.indir_check	# NO, goto "indir_check"	lgr	%r6,%r5		# r6 = r5	nill	%r6,0xf000	# mask it out and...	j	.base		# ...next iteration.indir_check:	tml	%r5,0x2		# is it a indirection page?	je	.done_test	# NO, goto "done_test"	nill	%r5,0xf000	# YES, mask out,	lgr	%r2,%r5		# move it into the right register,	j	.base		# and read next....done_test:	tml	%r5,0x4		# is it the done indicator?	je	.source_test	# NO! Well, then it should be the source indicator...	j	.done		# ok, lets finish it here....source_test:	tml	%r5,0x8		# it should be a source indicator...	je	.base		# NO, ignore it...	lgr	%r8,%r5		# r8 = r5	nill	%r8,0xf000	# masking0:	mvcle	%r6,%r8,0x0	# copy PAGE_SIZE bytes from r8 to r6 - pad with 0	jo	0b	j	.base.done:	lgr	%r0,%r4		# subcode	cghi	%r3,0	je	.diag	la	%r4,load_psw-.base(%r13)	# load psw-address into the register	o	%r3,4(%r4)	# or load address into psw	st	%r3,4(%r4)	mvc	0(8,%r0),0(%r4)	# copy psw to absolute address 0.diag:	diag	%r0,%r0,0x308SYM_CODE_END(relocate_kernel) 	.balign	8SYM_DATA_START_LOCAL(load_psw)	.long	0x00080000,0x80000000SYM_DATA_END_LABEL(load_psw, SYM_L_LOCAL, relocate_kernel_end)	.balign 8SYM_DATA(relocate_kernel_len, .quad relocate_kernel_end - relocate_kernel)