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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 * Copyright IBM Corp. 2005
3 *
4 * Author(s): Rolf Adelsberger,
5 * Heiko Carstens <heiko.carstens@de.ibm.com>
6 *
7 */
8
9#include <linux/linkage.h>
10#include <asm/sigp.h>
11
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
27ENTRY(relocate_kernel)
28 basr %r13,0 # base address
29 .base:
30 stnsm sys_msk-.base(%r13),0xfb # disable DAT
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)
39 mvc 0(8,%r0),0(%r1)
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:
46 lhi %r1,1 # mode 1 = esame
47 sigp %r1,%r0,SIGP_SET_ARCHITECTURE # switch to esame mode
48 sam64 # switch to 64 bit addressing mode
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)
57 .top:
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
67 .indir_check:
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...
73 .done_test:
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...
77 .source_test:
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
83 jo 0b
84 j .top
85 .done:
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
89 st %r3,4(%r4)
90 mvc 0(8,%r0),0(%r4) # copy psw to absolute address 0
91 tm have_diag308-.base(%r13),0x01
92 jno .no_diag308
93 diag %r0,%r0,0x308
94 .no_diag308:
95 sam31 # 31 bit mode
96 sr %r1,%r1 # erase register r1
97 sr %r2,%r2 # erase register r2
98 sigp %r1,%r2,SIGP_SET_ARCHITECTURE # set cpuid to zero
99 lpsw 0 # hopefully start new kernel...
100
101 .align 8
102 load_psw:
103 .long 0x00080000,0x80000000
104 sys_msk:
105 .quad 0
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
117 relocate_kernel_end:
118 .align 8
119 .globl relocate_kernel_len
120 relocate_kernel_len:
121 .quad relocate_kernel_end - relocate_kernel