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Heiko Carstenscf13f0e2005-06-25 14:58:11 -07001/*
2 * arch/s390/kernel/relocate_kernel.S
3 *
4 * (C) Copyright IBM Corp. 2005
5 *
Heiko Carstens25d83cb2006-09-28 16:56:37 +02006 * Author(s): Rolf Adelsberger,
Heiko Carstens5d3f2292005-08-01 21:11:33 -07007 * Heiko Carstens <heiko.carstens@de.ibm.com>
Heiko Carstenscf13f0e2005-06-25 14:58:11 -07008 *
9 */
10
Jan Glauber144d6342011-07-24 10:48:19 +020011#include <linux/linkage.h>
12
Heiko Carstenscf13f0e2005-06-25 14:58:11 -070013/*
14 * moves the new kernel to its destination...
15 * %r2 = pointer to first kimage_entry_t
16 * %r3 = start address - where to jump to after the job is done...
17 *
18 * %r5 will be used as temp. storage
19 * %r6 holds the destination address
20 * %r7 = PAGE_SIZE
21 * %r8 holds the source address
22 * %r9 = PAGE_SIZE
23 * %r10 is a page mask
24 */
25
26 .text
Jan Glauber144d6342011-07-24 10:48:19 +020027ENTRY(relocate_kernel)
Heiko Carstens25d83cb2006-09-28 16:56:37 +020028 basr %r13,0 # base address
Heiko Carstenscf13f0e2005-06-25 14:58:11 -070029 .base:
Heiko Carstens15e9b582006-12-04 15:40:26 +010030 stnsm sys_msk-.base(%r13),0xfb # disable DAT
Heiko Carstens5d3f2292005-08-01 21:11:33 -070031 stctl %c0,%c15,ctlregs-.base(%r13)
32 stm %r0,%r15,gprregs-.base(%r13)
33 la %r1,load_psw-.base(%r13)
Heiko Carstens25d83cb2006-09-28 16:56:37 +020034 mvc 0(8,%r0),0(%r1)
Heiko Carstens5d3f2292005-08-01 21:11:33 -070035 la %r0,.back-.base(%r13)
36 st %r0,4(%r0)
37 oi 4(%r0),0x80
38 mvc 0x68(8,%r0),0(%r1)
39 la %r0,.back_pgm-.base(%r13)
40 st %r0,0x6c(%r0)
41 oi 0x6c(%r0),0x80
42 lhi %r0,0
43 diag %r0,%r0,0x308
44 .back:
45 basr %r13,0
46 .back_base:
47 oi have_diag308-.back_base(%r13),0x01
48 lctl %c0,%c15,ctlregs-.back_base(%r13)
49 lm %r0,%r15,gprregs-.back_base(%r13)
50 j .start_reloc
51 .back_pgm:
52 lm %r0,%r15,gprregs-.base(%r13)
53 .start_reloc:
Heiko Carstens25d83cb2006-09-28 16:56:37 +020054 lhi %r10,-1 # preparing the mask
55 sll %r10,12 # shift it such that it becomes 0xf000
Heiko Carstenscf13f0e2005-06-25 14:58:11 -070056 .top:
Heiko Carstens25d83cb2006-09-28 16:56:37 +020057 lhi %r7,4096 # load PAGE_SIZE in r7
58 lhi %r9,4096 # load PAGE_SIZE in r9
59 l %r5,0(%r2) # read another word for indirection page
60 ahi %r2,4 # increment pointer
61 tml %r5,0x1 # is it a destination page?
62 je .indir_check # NO, goto "indir_check"
63 lr %r6,%r5 # r6 = r5
64 nr %r6,%r10 # mask it out and...
65 j .top # ...next iteration
Heiko Carstenscf13f0e2005-06-25 14:58:11 -070066 .indir_check:
Heiko Carstens25d83cb2006-09-28 16:56:37 +020067 tml %r5,0x2 # is it a indirection page?
68 je .done_test # NO, goto "done_test"
69 nr %r5,%r10 # YES, mask out,
70 lr %r2,%r5 # move it into the right register,
71 j .top # and read next...
Heiko Carstenscf13f0e2005-06-25 14:58:11 -070072 .done_test:
Heiko Carstens25d83cb2006-09-28 16:56:37 +020073 tml %r5,0x4 # is it the done indicator?
74 je .source_test # NO! Well, then it should be the source indicator...
75 j .done # ok, lets finish it here...
Heiko Carstenscf13f0e2005-06-25 14:58:11 -070076 .source_test:
Heiko Carstens25d83cb2006-09-28 16:56:37 +020077 tml %r5,0x8 # it should be a source indicator...
78 je .top # NO, ignore it...
79 lr %r8,%r5 # r8 = r5
80 nr %r8,%r10 # masking
81 0: mvcle %r6,%r8,0x0 # copy PAGE_SIZE bytes from r8 to r6 - pad with 0
Heiko Carstenscf13f0e2005-06-25 14:58:11 -070082 jo 0b
83 j .top
84 .done:
Heiko Carstens25d83cb2006-09-28 16:56:37 +020085 sr %r0,%r0 # clear register r0
86 la %r4,load_psw-.base(%r13) # load psw-address into the register
87 o %r3,4(%r4) # or load address into psw
Heiko Carstenscf13f0e2005-06-25 14:58:11 -070088 st %r3,4(%r4)
Heiko Carstens25d83cb2006-09-28 16:56:37 +020089 mvc 0(8,%r0),0(%r4) # copy psw to absolute address 0
Heiko Carstens5d3f2292005-08-01 21:11:33 -070090 tm have_diag308-.base(%r13),0x01
91 jno .no_diag308
92 diag %r0,%r0,0x308
93 .no_diag308:
Heiko Carstens25d83cb2006-09-28 16:56:37 +020094 sr %r1,%r1 # clear %r1
95 sr %r2,%r2 # clear %r2
96 sigp %r1,%r2,0x12 # set cpuid to zero
97 lpsw 0 # hopefully start new kernel...
Heiko Carstenscf13f0e2005-06-25 14:58:11 -070098
99 .align 8
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700100 load_psw:
101 .long 0x00080000,0x80000000
102 sys_msk:
103 .quad 0
Heiko Carstens5d3f2292005-08-01 21:11:33 -0700104 ctlregs:
105 .rept 16
106 .long 0
107 .endr
108 gprregs:
109 .rept 16
110 .long 0
111 .endr
112 have_diag308:
113 .byte 0
114 .align 8
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700115 relocate_kernel_end:
Jan Glauber144d6342011-07-24 10:48:19 +0200116 .align 8
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700117 .globl relocate_kernel_len
118 relocate_kernel_len:
119 .quad relocate_kernel_end - relocate_kernel