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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright IBM Corp. 2005
4 *
5 * Author(s): Rolf Adelsberger
6 *
7 */
8
9#include <linux/linkage.h>
10#include <asm/page.h>
11#include <asm/sigp.h>
12
13/*
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 * %r4 = subcode
18 *
19 * %r5 will be used as temp. storage
20 * %r6 holds the destination address
21 * %r7 = PAGE_SIZE
22 * %r8 holds the source address
23 * %r9 = PAGE_SIZE
24 *
25 * 0xf000 is a page_mask
26 */
27
28 .text
29SYM_CODE_START(relocate_kernel)
30 basr %r13,0 # base address
31.base:
32 lghi %r7,PAGE_SIZE # load PAGE_SIZE in r7
33 lghi %r9,PAGE_SIZE # load PAGE_SIZE in r9
34 lg %r5,0(%r2) # read another word for indirection page
35 aghi %r2,8 # increment pointer
36 tml %r5,0x1 # is it a destination page?
37 je .indir_check # NO, goto "indir_check"
38 lgr %r6,%r5 # r6 = r5
39 nill %r6,0xf000 # mask it out and...
40 j .base # ...next iteration
41.indir_check:
42 tml %r5,0x2 # is it a indirection page?
43 je .done_test # NO, goto "done_test"
44 nill %r5,0xf000 # YES, mask out,
45 lgr %r2,%r5 # move it into the right register,
46 j .base # and read next...
47.done_test:
48 tml %r5,0x4 # is it the done indicator?
49 je .source_test # NO! Well, then it should be the source indicator...
50 j .done # ok, lets finish it here...
51.source_test:
52 tml %r5,0x8 # it should be a source indicator...
53 je .base # NO, ignore it...
54 lgr %r8,%r5 # r8 = r5
55 nill %r8,0xf000 # masking
560: mvcle %r6,%r8,0x0 # copy PAGE_SIZE bytes from r8 to r6 - pad with 0
57 jo 0b
58 j .base
59.done:
60 lgr %r0,%r4 # subcode
61 cghi %r3,0
62 je .diag
63 la %r4,load_psw-.base(%r13) # load psw-address into the register
64 o %r3,4(%r4) # or load address into psw
65 st %r3,4(%r4)
66 mvc 0(8,%r0),0(%r4) # copy psw to absolute address 0
67.diag:
68 diag %r0,%r0,0x308
69SYM_CODE_END(relocate_kernel)
70
71 .balign 8
72SYM_DATA_START_LOCAL(load_psw)
73 .long 0x00080000,0x80000000
74SYM_DATA_END_LABEL(load_psw, SYM_L_LOCAL, relocate_kernel_end)
75 .balign 8
76SYM_DATA(relocate_kernel_len, .quad relocate_kernel_end - relocate_kernel)
1/*
2 * arch/s390/kernel/relocate_kernel.S
3 *
4 * (C) Copyright IBM Corp. 2005
5 *
6 * Author(s): Rolf Adelsberger,
7 * Heiko Carstens <heiko.carstens@de.ibm.com>
8 *
9 */
10
11#include <linux/linkage.h>
12
13/*
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
27ENTRY(relocate_kernel)
28 basr %r13,0 # base address
29 .base:
30 stnsm sys_msk-.base(%r13),0xfb # disable DAT
31 stctl %c0,%c15,ctlregs-.base(%r13)
32 stm %r0,%r15,gprregs-.base(%r13)
33 la %r1,load_psw-.base(%r13)
34 mvc 0(8,%r0),0(%r1)
35 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:
54 lhi %r10,-1 # preparing the mask
55 sll %r10,12 # shift it such that it becomes 0xf000
56 .top:
57 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
66 .indir_check:
67 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...
72 .done_test:
73 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...
76 .source_test:
77 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
82 jo 0b
83 j .top
84 .done:
85 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
88 st %r3,4(%r4)
89 mvc 0(8,%r0),0(%r4) # copy psw to absolute address 0
90 tm have_diag308-.base(%r13),0x01
91 jno .no_diag308
92 diag %r0,%r0,0x308
93 .no_diag308:
94 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...
98
99 .align 8
100 load_psw:
101 .long 0x00080000,0x80000000
102 sys_msk:
103 .quad 0
104 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
115 relocate_kernel_end:
116 .align 8
117 .globl relocate_kernel_len
118 relocate_kernel_len:
119 .quad relocate_kernel_end - relocate_kernel