projects/linux·blob master · refs

76 lines · 2.0 KiB

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)