1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * S390 kdump lowlevel functions (new kernel)
4 *
5 * Copyright IBM Corp. 2011
6 * Author(s): Michael Holzheu <holzheu@linux.vn
7 */
8
9 #include <asm/sigp.h>
10
11 #define DATAMOVER_ADDR 0x4000
12 #define COPY_PAGE_ADDR 0x6000
13
14 #ifdef CONFIG_CRASH_DUMP
15
16 #
17 # kdump entry (new kernel - not yet relocated)
18 #
19 # Note: This code has to be position independe
20 #
21
22 SYM_CODE_START_LOCAL(startup_kdump)
23 lhi %r1,2
24 sigp %r1,%r0,SIGP_SET_ARCHITECTURE
25 sam64
26 basr %r13,0
27 .Lbase:
28 larl %r2,.Lbase_addr
29 lg %r2,0(%r2)
30 clgr %r2,%r13
31 jne .Lrelocate
32 lghi %r2,0
33 brasl %r14,startup_kdump_relocated
34
35 .Lrelocate:
36 larl %r4,startup
37 lg %r2,0x418(%r4)
38 lg %r3,0x420(%r4)
39
40 larl %r10,.Lcopy_start
41 lghi %r8,DATAMOVER_ADDR
42 mvc 0(256,%r8),0(%r10)
43
44 agr %r8,%r2
45 mvc 0(256,%r8),0(%r10)
46
47 lghi %r14,DATAMOVER_ADDR
48 basr %r14,%r14
49 .Lbase_addr:
50 .quad .Lbase
51
52 #
53 # kdump data mover code (runs at address DATAM
54 #
55 # r2: kdump base address
56 # r3: kdump size
57 #
58 .Lcopy_start:
59 basr %r13,0
60 0:
61 lgr %r11,%r2
62 lgr %r12,%r2
63 agr %r12,%r3
64
65 lghi %r5,0
66 lghi %r10,COPY_PAGE_ADDR
67 1:
68 mvc 0(256,%r10),0(%r5)
69 mvc 0(256,%r5),0(%r11)
70 mvc 0(256,%r11),0(%r10)
71 aghi %r11,256
72 aghi %r5,256
73 clgr %r11,%r12
74 jl 1b
75
76 lg %r14,.Lstartup_kdump-0b(%r13)
77 basr %r14,%r14
78 .Lstartup_kdump:
79 .long 0x00000000,0x00000000 + startu
80 .Lcopy_end:
81
82 #
83 # Startup of kdump (relocated new kernel)
84 #
85 .balign 2
86 startup_kdump_relocated:
87 basr %r13,0
88 0: lpswe .Lrestart_psw-0b(%r13)
89 SYM_CODE_END(startup_kdump)
90 .balign 8
91 .Lrestart_psw:
92 .quad 0x0000000080000000,0x000000000
93 #else
94 SYM_CODE_START_LOCAL(startup_kdump)
95 larl %r13,startup_kdump_crash
96 lpswe 0(%r13)
97 SYM_CODE_END(startup_kdump)
98 .balign 8
99 startup_kdump_crash:
100 .quad 0x0002000080000000,0x000000000
101 #endif /* CONFIG_CRASH_DUMP */
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