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1 | /* |
2 | * arch/s390/kernel/relocate_kernel.S |
3 | * |
4 | * (C) Copyright IBM Corp. 2005 |
5 | * |
6 | * Author(s): Rolf Adelsberger, |
7 | * Heiko Carstens <heiko.carstens@de.ibm.com> |
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: |
27 | basr %r13,0 # base address |
28 | .base: |
29 | stnsm sys_msk-.base(%r13),0xfb # disable DAT |
30 | stctl %c0,%c15,ctlregs-.base(%r13) |
31 | stm %r0,%r15,gprregs-.base(%r13) |
32 | la %r1,load_psw-.base(%r13) |
33 | mvc 0(8,%r0),0(%r1) |
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: |
53 | lhi %r10,-1 # preparing the mask |
54 | sll %r10,12 # shift it such that it becomes 0xf000 |
55 | .top: |
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 |
65 | .indir_check: |
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... |
71 | .done_test: |
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... |
75 | .source_test: |
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 |
81 | jo 0b |
82 | j .top |
83 | .done: |
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 |
87 | st %r3,4(%r4) |
88 | mvc 0(8,%r0),0(%r4) # copy psw to absolute address 0 |
89 | tm have_diag308-.base(%r13),0x01 |
90 | jno .no_diag308 |
91 | diag %r0,%r0,0x308 |
92 | .no_diag308: |
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... |
97 | |
98 | .align 8 |
99 | load_psw: |
100 | .long 0x00080000,0x80000000 |
101 | sys_msk: |
102 | .quad 0 |
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 |
114 | relocate_kernel_end: |
115 | .globl relocate_kernel_len |
116 | relocate_kernel_len: |
117 | .quad relocate_kernel_end - relocate_kernel |
118 |
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