1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
|
/*
* arch/s390/kernel/relocate_kernel64.S
*
* (C) Copyright IBM Corp. 2005
*
* Author(s): Rolf Adelsberger,
* Heiko Carstens <heiko.carstens@de.ibm.com>
*
*/
/*
* moves the new kernel to its destination...
* %r2 = pointer to first kimage_entry_t
* %r3 = start address - where to jump to after the job is done...
*
* %r5 will be used as temp. storage
* %r6 holds the destination address
* %r7 = PAGE_SIZE
* %r8 holds the source address
* %r9 = PAGE_SIZE
*
* 0xf000 is a page_mask
*/
.text
.globl relocate_kernel
relocate_kernel:
basr %r13,0 # base address
.base:
stnsm sys_msk-.base(%r13),0xf8 # disable DAT and IRQs
spx zero64-.base(%r13) # absolute addressing mode
stctg %c0,%c15,ctlregs-.base(%r13)
stmg %r0,%r15,gprregs-.base(%r13)
lghi %r0,3
sllg %r0,%r0,31
stg %r0,0x1d0(%r0)
la %r0,.back_pgm-.base(%r13)
stg %r0,0x1d8(%r0)
la %r1,load_psw-.base(%r13)
mvc 0(8,%r0),0(%r1)
la %r0,.back-.base(%r13)
st %r0,4(%r0)
oi 4(%r0),0x80
lghi %r0,0
diag %r0,%r0,0x308
.back:
lhi %r1,1 # mode 1 = esame
sigp %r1,%r0,0x12 # switch to esame mode
sam64 # switch to 64 bit addressing mode
basr %r13,0
.back_base:
oi have_diag308-.back_base(%r13),0x01
lctlg %c0,%c15,ctlregs-.back_base(%r13)
lmg %r0,%r15,gprregs-.back_base(%r13)
j .top
.back_pgm:
lmg %r0,%r15,gprregs-.base(%r13)
.top:
lghi %r7,4096 # load PAGE_SIZE in r7
lghi %r9,4096 # load PAGE_SIZE in r9
lg %r5,0(%r2) # read another word for indirection page
aghi %r2,8 # increment pointer
tml %r5,0x1 # is it a destination page?
je .indir_check # NO, goto "indir_check"
lgr %r6,%r5 # r6 = r5
nill %r6,0xf000 # mask it out and...
j .top # ...next iteration
.indir_check:
tml %r5,0x2 # is it a indirection page?
je .done_test # NO, goto "done_test"
nill %r5,0xf000 # YES, mask out,
lgr %r2,%r5 # move it into the right register,
j .top # and read next...
.done_test:
tml %r5,0x4 # is it the done indicator?
je .source_test # NO! Well, then it should be the source indicator...
j .done # ok, lets finish it here...
.source_test:
tml %r5,0x8 # it should be a source indicator...
je .top # NO, ignore it...
lgr %r8,%r5 # r8 = r5
nill %r8,0xf000 # masking
0: mvcle %r6,%r8,0x0 # copy PAGE_SIZE bytes from r8 to r6 - pad with 0
jo 0b
j .top
.done:
sgr %r0,%r0 # clear register r0
la %r4,load_psw-.base(%r13) # load psw-address into the register
o %r3,4(%r4) # or load address into psw
st %r3,4(%r4)
mvc 0(8,%r0),0(%r4) # copy psw to absolute address 0
tm have_diag308-.base(%r13),0x01
jno .no_diag308
diag %r0,%r0,0x308
.no_diag308:
sam31 # 31 bit mode
sr %r1,%r1 # erase register r1
sr %r2,%r2 # erase register r2
sigp %r1,%r2,0x12 # set cpuid to zero
lpsw 0 # hopefully start new kernel...
.align 8
zero64:
.quad 0
load_psw:
.long 0x00080000,0x80000000
sys_msk:
.quad 0
ctlregs:
.rept 16
.quad 0
.endr
gprregs:
.rept 16
.quad 0
.endr
have_diag308:
.byte 0
.align 8
relocate_kernel_end:
.globl relocate_kernel_len
relocate_kernel_len:
.quad relocate_kernel_end - relocate_kernel
|
