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authorHeiko Carstens <heiko.carstens@de.ibm.com>2005-06-25 17:58:11 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-25 19:24:51 -0400
commitcf13f0eaffa31bf6a145c53c589654b11c72ddc7 (patch)
tree55c11d753422398b060ea9571698285b5fdc603b /arch/s390/kernel/relocate_kernel.S
parentfce0d5740322b98b863f9e609f5a9bd4c06703af (diff)
[PATCH] kexec: s390 support
Add kexec support for s390 architecture. From: Milton Miller <miltonm@bga.com> - Fix passing of first argument to relocate_kernel assembly. - Fix Kconfig description. - Remove wrong comment and comments that describe obvious things. - Allow only KEXEC_TYPE_DEFAULT as image type -> dump not supported. Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/s390/kernel/relocate_kernel.S')
-rw-r--r--arch/s390/kernel/relocate_kernel.S81
1 files changed, 81 insertions, 0 deletions
diff --git a/arch/s390/kernel/relocate_kernel.S b/arch/s390/kernel/relocate_kernel.S
new file mode 100644
index 000000000000..d5e4a62fbb79
--- /dev/null
+++ b/arch/s390/kernel/relocate_kernel.S
@@ -0,0 +1,81 @@
1/*
2 * arch/s390/kernel/relocate_kernel.S
3 *
4 * (C) Copyright IBM Corp. 2005
5 *
6 * Author(s): Rolf Adelsberger <adelsberger@de.ibm.com>
7 *
8 */
9
10/*
11 * moves the new kernel to its destination...
12 * %r2 = pointer to first kimage_entry_t
13 * %r3 = start address - where to jump to after the job is done...
14 *
15 * %r5 will be used as temp. storage
16 * %r6 holds the destination address
17 * %r7 = PAGE_SIZE
18 * %r8 holds the source address
19 * %r9 = PAGE_SIZE
20 * %r10 is a page mask
21 */
22
23 .text
24 .globl relocate_kernel
25 relocate_kernel:
26 basr %r13,0 #base address
27 .base:
28 spx zero64-.base(%r13) #absolute addressing mode
29 stnsm sys_msk-.base(%r13),0xf8 #disable DAT and IRQ (external)
30 lhi %r10,-1 #preparing the mask
31 sll %r10,12 #shift it such that it becomes 0xf000
32 .top:
33 lhi %r7,4096 #load PAGE_SIZE in r7
34 lhi %r9,4096 #load PAGE_SIZE in r9
35 l %r5,0(%r2) #read another word for indirection page
36 ahi %r2,4 #increment pointer
37 tml %r5,0x1 #is it a destination page?
38 je .indir_check #NO, goto "indir_check"
39 lr %r6,%r5 #r6 = r5
40 nr %r6,%r10 #mask it out and...
41 j .top #...next iteration
42 .indir_check:
43 tml %r5,0x2 #is it a indirection page?
44 je .done_test #NO, goto "done_test"
45 nr %r5,%r10 #YES, mask out,
46 lr %r2,%r5 #move it into the right register,
47 j .top #and read next...
48 .done_test:
49 tml %r5,0x4 #is it the done indicator?
50 je .source_test #NO! Well, then it should be the source indicator...
51 j .done #ok, lets finish it here...
52 .source_test:
53 tml %r5,0x8 #it should be a source indicator...
54 je .top #NO, ignore it...
55 lr %r8,%r5 #r8 = r5
56 nr %r8,%r10 #masking
57 0: mvcle %r6,%r8,0x0 #copy PAGE_SIZE bytes from r8 to r6 - pad with 0
58 jo 0b
59 j .top
60 .done:
61 sr %r0,%r0 #clear register r0
62 la %r4,load_psw-.base(%r13) #load psw-address into the register
63 o %r3,4(%r4) #or load address into psw
64 st %r3,4(%r4)
65 mvc 0(8,%r0),0(%r4) #copy psw to absolute address 0
66 sr %r1,%r1 #clear %r1
67 sr %r2,%r2 #clear %r2
68 sigp %r1,%r2,0x12 #set cpuid to zero
69 lpsw 0 #hopefully start new kernel...
70
71 .align 8
72 zero64:
73 .quad 0
74 load_psw:
75 .long 0x00080000,0x80000000
76 sys_msk:
77 .quad 0
78 relocate_kernel_end:
79 .globl relocate_kernel_len
80 relocate_kernel_len:
81 .quad relocate_kernel_end - relocate_kernel