[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / s390 / kernel / relocate_kernel64.S

/*
 * Copyright IBM Corp. 2005
 *
 * Author(s): Rolf Adelsberger,
 *	      Heiko Carstens <heiko.carstens@de.ibm.com>
 *
 */

#include <linux/linkage.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...
 *
 * %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
 */

	.text
ENTRY(relocate_kernel)
		basr	%r13,0		# base address
	.base:
		stnsm	sys_msk-.base(%r13),0xfb	# disable DAT
		stctg	%c0,%c15,ctlregs-.base(%r13)
		stmg	%r0,%r15,gprregs-.base(%r13)
		lghi	%r0,3
		sllg	%r0,%r0,31
		stg	%r0,0x1d0(%r0)
		la	%r0,.back_pgm-.base(%r13)
		stg	%r0,0x1d8(%r0)
		la	%r1,load_psw-.base(%r13)
		mvc	0(8,%r0),0(%r1)
		la	%r0,.back-.base(%r13)
		st	%r0,4(%r0)
		oi	4(%r0),0x80
		lghi	%r0,0
		diag	%r0,%r0,0x308
	.back:
		lhi	%r1,1		# mode 1 = esame
		sigp	%r1,%r0,SIGP_SET_ARCHITECTURE # switch to esame mode
		sam64			# switch to 64 bit addressing mode
		basr	%r13,0
	.back_base:
		oi	have_diag308-.back_base(%r13),0x01
		lctlg	%c0,%c15,ctlregs-.back_base(%r13)
		lmg	%r0,%r15,gprregs-.back_base(%r13)
		j	.top
	.back_pgm:
		lmg	%r0,%r15,gprregs-.base(%r13)
	.top:
		lghi	%r7,4096	# load PAGE_SIZE in r7
		lghi	%r9,4096	# 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	.top		# ...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	.top		# 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	.top		# NO, ignore it...
		lgr	%r8,%r5		# r8 = r5
		nill	%r8,0xf000	# masking
	0:	mvcle	%r6,%r8,0x0	# copy PAGE_SIZE bytes from r8 to r6 - pad with 0
		jo	0b
		j	.top
	.done:
		sgr	%r0,%r0		# clear register r0
		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
		tm	have_diag308-.base(%r13),0x01
		jno	.no_diag308
		diag	%r0,%r0,0x308
	.no_diag308:
		sam31			# 31 bit mode
		sr	%r1,%r1		# erase register r1
		sr	%r2,%r2		# erase register r2
		sigp	%r1,%r2,SIGP_SET_ARCHITECTURE # set cpuid to zero
		lpsw	0		# hopefully start new kernel...

		.align	8
	load_psw:
		.long	0x00080000,0x80000000
	sys_msk:
		.quad	0
	ctlregs:
		.rept	16
		.quad	0
		.endr
	gprregs:
		.rept	16
		.quad	0
		.endr
	have_diag308:
		.byte	0
		.align	8
	relocate_kernel_end:
	.align 8
	.globl	relocate_kernel_len
	relocate_kernel_len:
		.quad	relocate_kernel_end - relocate_kernel
Commit	Line	Data
cf13f0ea	1	/*
a53c8fab	2	* Copyright IBM Corp. 2005
cf13f0ea	3	*
25d83cbf	4	* Author(s): Rolf Adelsberger,
5d3f229f	5	* Heiko Carstens <heiko.carstens@de.ibm.com>
cf13f0ea HC	6	*
	7	*/
	8
144d634a	9	#include <linux/linkage.h>
eb546195	10	#include <asm/sigp.h>
144d634a	11
cf13f0ea HC	12	/*
	13	* moves the new kernel to its destination...
	14	* %r2 = pointer to first kimage_entry_t
	15	* %r3 = start address - where to jump to after the job is done...
	16	*
	17	* %r5 will be used as temp. storage
	18	* %r6 holds the destination address
	19	* %r7 = PAGE_SIZE
	20	* %r8 holds the source address
	21	* %r9 = PAGE_SIZE
	22	*
	23	* 0xf000 is a page_mask
	24	*/
	25
	26	.text
144d634a	27	ENTRY(relocate_kernel)
25d83cbf	28	basr %r13,0 # base address
cf13f0ea	29	.base:
15e9b586	30	stnsm sys_msk-.base(%r13),0xfb # disable DAT
5d3f229f HC	31	stctg %c0,%c15,ctlregs-.base(%r13)
	32	stmg %r0,%r15,gprregs-.base(%r13)
	33	lghi %r0,3
	34	sllg %r0,%r0,31
	35	stg %r0,0x1d0(%r0)
	36	la %r0,.back_pgm-.base(%r13)
	37	stg %r0,0x1d8(%r0)
	38	la %r1,load_psw-.base(%r13)
25d83cbf	39	mvc 0(8,%r0),0(%r1)
5d3f229f HC	40	la %r0,.back-.base(%r13)
	41	st %r0,4(%r0)
	42	oi 4(%r0),0x80
	43	lghi %r0,0
	44	diag %r0,%r0,0x308
	45	.back:
25d83cbf	46	lhi %r1,1 # mode 1 = esame
eb546195	47	sigp %r1,%r0,SIGP_SET_ARCHITECTURE # switch to esame mode
25d83cbf	48	sam64 # switch to 64 bit addressing mode
5d3f229f HC	49	basr %r13,0
	50	.back_base:
	51	oi have_diag308-.back_base(%r13),0x01
	52	lctlg %c0,%c15,ctlregs-.back_base(%r13)
	53	lmg %r0,%r15,gprregs-.back_base(%r13)
	54	j .top
	55	.back_pgm:
	56	lmg %r0,%r15,gprregs-.base(%r13)
cf13f0ea	57	.top:
25d83cbf HC	58	lghi %r7,4096 # load PAGE_SIZE in r7
	59	lghi %r9,4096 # load PAGE_SIZE in r9
	60	lg %r5,0(%r2) # read another word for indirection page
	61	aghi %r2,8 # increment pointer
	62	tml %r5,0x1 # is it a destination page?
	63	je .indir_check # NO, goto "indir_check"
	64	lgr %r6,%r5 # r6 = r5
	65	nill %r6,0xf000 # mask it out and...
	66	j .top # ...next iteration
cf13f0ea	67	.indir_check:
25d83cbf HC	68	tml %r5,0x2 # is it a indirection page?
	69	je .done_test # NO, goto "done_test"
	70	nill %r5,0xf000 # YES, mask out,
	71	lgr %r2,%r5 # move it into the right register,
	72	j .top # and read next...
cf13f0ea	73	.done_test:
25d83cbf HC	74	tml %r5,0x4 # is it the done indicator?
	75	je .source_test # NO! Well, then it should be the source indicator...
	76	j .done # ok, lets finish it here...
cf13f0ea	77	.source_test:
25d83cbf HC	78	tml %r5,0x8 # it should be a source indicator...
	79	je .top # NO, ignore it...
	80	lgr %r8,%r5 # r8 = r5
	81	nill %r8,0xf000 # masking
	82	0: mvcle %r6,%r8,0x0 # copy PAGE_SIZE bytes from r8 to r6 - pad with 0
cf13f0ea	83	jo 0b
25d83cbf	84	j .top
cf13f0ea	85	.done:
25d83cbf HC	86	sgr %r0,%r0 # clear register r0
	87	la %r4,load_psw-.base(%r13) # load psw-address into the register
	88	o %r3,4(%r4) # or load address into psw
cf13f0ea	89	st %r3,4(%r4)
25d83cbf	90	mvc 0(8,%r0),0(%r4) # copy psw to absolute address 0
5d3f229f HC	91	tm have_diag308-.base(%r13),0x01
	92	jno .no_diag308
	93	diag %r0,%r0,0x308
	94	.no_diag308:
25d83cbf HC	95	sam31 # 31 bit mode
	96	sr %r1,%r1 # erase register r1
	97	sr %r2,%r2 # erase register r2
eb546195	98	sigp %r1,%r2,SIGP_SET_ARCHITECTURE # set cpuid to zero
25d83cbf	99	lpsw 0 # hopefully start new kernel...
cf13f0ea	100
25d83cbf	101	.align 8
cf13f0ea HC	102	load_psw:
	103	.long 0x00080000,0x80000000
	104	sys_msk:
	105	.quad 0
5d3f229f HC	106	ctlregs:
	107	.rept 16
	108	.quad 0
	109	.endr
	110	gprregs:
	111	.rept 16
	112	.quad 0
	113	.endr
	114	have_diag308:
	115	.byte 0
	116	.align 8
cf13f0ea	117	relocate_kernel_end:
144d634a	118	.align 8
cf13f0ea HC	119	.globl relocate_kernel_len
	120	relocate_kernel_len:
	121	.quad relocate_kernel_end - relocate_kernel