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review.evervolv.com / android_kernel_htc_msm8960 / eda6e6f86b5f95b982ac7ebf7cf5be2a29a291e9 / . / arch / s390 / kernel / relocate_kernel.S
blob: 3b456b80bcee839f5df358d8af6f3e8c24df8fa7 [file] [log] [blame]
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]1/*
2 * arch/s390/kernel/relocate_kernel.S
3 *
4 * (C) Copyright IBM Corp. 2005
5 *
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]6 * Author(s): Rolf Adelsberger,
Heiko Carstens5d3f2292005-08-01 21:11:33 -0700[diff] [blame]7 * Heiko Carstens <heiko.carstens@de.ibm.com>
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]8 *
9 */
10
11/*
12 * moves the new kernel to its destination...
13 * %r2 = pointer to first kimage_entry_t
14 * %r3 = start address - where to jump to after the job is done...
15 *
16 * %r5 will be used as temp. storage
17 * %r6 holds the destination address
18 * %r7 = PAGE_SIZE
19 * %r8 holds the source address
20 * %r9 = PAGE_SIZE
21 * %r10 is a page mask
22 */
23
24 .text
25 .globl relocate_kernel
26 relocate_kernel:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]27 basr %r13,0 # base address
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]28 .base:
Heiko Carstens15e9b582006-12-04 15:40:26 +0100[diff] [blame]29 stnsm sys_msk-.base(%r13),0xfb # disable DAT
Heiko Carstens5d3f2292005-08-01 21:11:33 -0700[diff] [blame]30 stctl %c0,%c15,ctlregs-.base(%r13)
31 stm %r0,%r15,gprregs-.base(%r13)
32 la %r1,load_psw-.base(%r13)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]33 mvc 0(8,%r0),0(%r1)
Heiko Carstens5d3f2292005-08-01 21:11:33 -0700[diff] [blame]34 la %r0,.back-.base(%r13)
35 st %r0,4(%r0)
36 oi 4(%r0),0x80
37 mvc 0x68(8,%r0),0(%r1)
38 la %r0,.back_pgm-.base(%r13)
39 st %r0,0x6c(%r0)
40 oi 0x6c(%r0),0x80
41 lhi %r0,0
42 diag %r0,%r0,0x308
43 .back:
44 basr %r13,0
45 .back_base:
46 oi have_diag308-.back_base(%r13),0x01
47 lctl %c0,%c15,ctlregs-.back_base(%r13)
48 lm %r0,%r15,gprregs-.back_base(%r13)
49 j .start_reloc
50 .back_pgm:
51 lm %r0,%r15,gprregs-.base(%r13)
52 .start_reloc:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]53 lhi %r10,-1 # preparing the mask
54 sll %r10,12 # shift it such that it becomes 0xf000
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]55 .top:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]56 lhi %r7,4096 # load PAGE_SIZE in r7
57 lhi %r9,4096 # load PAGE_SIZE in r9
58 l %r5,0(%r2) # read another word for indirection page
59 ahi %r2,4 # increment pointer
60 tml %r5,0x1 # is it a destination page?
61 je .indir_check # NO, goto "indir_check"
62 lr %r6,%r5 # r6 = r5
63 nr %r6,%r10 # mask it out and...
64 j .top # ...next iteration
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]65 .indir_check:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]66 tml %r5,0x2 # is it a indirection page?
67 je .done_test # NO, goto "done_test"
68 nr %r5,%r10 # YES, mask out,
69 lr %r2,%r5 # move it into the right register,
70 j .top # and read next...
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]71 .done_test:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]72 tml %r5,0x4 # is it the done indicator?
73 je .source_test # NO! Well, then it should be the source indicator...
74 j .done # ok, lets finish it here...
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]75 .source_test:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]76 tml %r5,0x8 # it should be a source indicator...
77 je .top # NO, ignore it...
78 lr %r8,%r5 # r8 = r5
79 nr %r8,%r10 # masking
80 0: mvcle %r6,%r8,0x0 # copy PAGE_SIZE bytes from r8 to r6 - pad with 0
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]81 jo 0b
82 j .top
83 .done:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]84 sr %r0,%r0 # clear register r0
85 la %r4,load_psw-.base(%r13) # load psw-address into the register
86 o %r3,4(%r4) # or load address into psw
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]87 st %r3,4(%r4)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]88 mvc 0(8,%r0),0(%r4) # copy psw to absolute address 0
Heiko Carstens5d3f2292005-08-01 21:11:33 -0700[diff] [blame]89 tm have_diag308-.base(%r13),0x01
90 jno .no_diag308
91 diag %r0,%r0,0x308
92 .no_diag308:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]93 sr %r1,%r1 # clear %r1
94 sr %r2,%r2 # clear %r2
95 sigp %r1,%r2,0x12 # set cpuid to zero
96 lpsw 0 # hopefully start new kernel...
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]97
98 .align 8
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]99 load_psw:
100 .long 0x00080000,0x80000000
101 sys_msk:
102 .quad 0
Heiko Carstens5d3f2292005-08-01 21:11:33 -0700[diff] [blame]103 ctlregs:
104 .rept 16
105 .long 0
106 .endr
107 gprregs:
108 .rept 16
109 .long 0
110 .endr
111 have_diag308:
112 .byte 0
113 .align 8
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]114 relocate_kernel_end:
115 .globl relocate_kernel_len
116 relocate_kernel_len:
117 .quad relocate_kernel_end - relocate_kernel