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 afte
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
29 SYM_CODE_START(relocate_kernel)
30 basr %r13,0 # base address
31 .base:
32 lghi %r7,PAGE_SIZE # load PAGE_SI
33 lghi %r9,PAGE_SIZE # load PAGE_SI
34 lg %r5,0(%r2) # read another
35 aghi %r2,8 # increment po
36 tml %r5,0x1 # is it a dest
37 je .indir_check # NO, goto "in
38 lgr %r6,%r5 # r6 = r5
39 nill %r6,0xf000 # mask it out
40 j .base # ...next iter
41 .indir_check:
42 tml %r5,0x2 # is it a indi
43 je .done_test # NO, goto "do
44 nill %r5,0xf000 # YES, mask ou
45 lgr %r2,%r5 # move it into
46 j .base # and read nex
47 .done_test:
48 tml %r5,0x4 # is it the do
49 je .source_test # NO! Well, th
50 j .done # ok, lets fin
51 .source_test:
52 tml %r5,0x8 # it should be
53 je .base # NO, ignore i
54 lgr %r8,%r5 # r8 = r5
55 nill %r8,0xf000 # masking
56 0: mvcle %r6,%r8,0x0 # copy PAGE_SI
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)
64 o %r3,4(%r4) # or load addr
65 st %r3,4(%r4)
66 mvc 0(8,%r0),0(%r4) # copy psw to
67 .diag:
68 diag %r0,%r0,0x308
69 SYM_CODE_END(relocate_kernel)
70
71 .balign 8
72 SYM_DATA_START_LOCAL(load_psw)
73 .long 0x00080000,0x80000000
74 SYM_DATA_END_LABEL(load_psw, SYM_L_LOCAL, relo
75 .balign 8
76 SYM_DATA(relocate_kernel_len, .quad relocate_k
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