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Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
cf13f0ea | 2 | /* |
a53c8fab | 3 | * Copyright IBM Corp. 2005 |
cf13f0ea | 4 | * |
25d83cbf | 5 | * Author(s): Rolf Adelsberger, |
5d3f229f | 6 | * Heiko Carstens <heiko.carstens@de.ibm.com> |
cf13f0ea HC |
7 | * |
8 | */ | |
9 | ||
144d634a | 10 | #include <linux/linkage.h> |
f1c1174f | 11 | #include <asm/page.h> |
eb546195 | 12 | #include <asm/sigp.h> |
144d634a | 13 | |
cf13f0ea HC |
14 | /* |
15 | * moves the new kernel to its destination... | |
16 | * %r2 = pointer to first kimage_entry_t | |
17 | * %r3 = start address - where to jump to after the job is done... | |
18 | * | |
19 | * %r5 will be used as temp. storage | |
20 | * %r6 holds the destination address | |
21 | * %r7 = PAGE_SIZE | |
22 | * %r8 holds the source address | |
23 | * %r9 = PAGE_SIZE | |
24 | * | |
25 | * 0xf000 is a page_mask | |
26 | */ | |
27 | ||
28 | .text | |
144d634a | 29 | ENTRY(relocate_kernel) |
25d83cbf | 30 | basr %r13,0 # base address |
cf13f0ea | 31 | .base: |
15e9b586 | 32 | stnsm sys_msk-.base(%r13),0xfb # disable DAT |
5d3f229f HC |
33 | stctg %c0,%c15,ctlregs-.base(%r13) |
34 | stmg %r0,%r15,gprregs-.base(%r13) | |
35 | lghi %r0,3 | |
36 | sllg %r0,%r0,31 | |
37 | stg %r0,0x1d0(%r0) | |
38 | la %r0,.back_pgm-.base(%r13) | |
39 | stg %r0,0x1d8(%r0) | |
40 | la %r1,load_psw-.base(%r13) | |
25d83cbf | 41 | mvc 0(8,%r0),0(%r1) |
5d3f229f HC |
42 | la %r0,.back-.base(%r13) |
43 | st %r0,4(%r0) | |
44 | oi 4(%r0),0x80 | |
45 | lghi %r0,0 | |
46 | diag %r0,%r0,0x308 | |
47 | .back: | |
25d83cbf | 48 | lhi %r1,1 # mode 1 = esame |
eb546195 | 49 | sigp %r1,%r0,SIGP_SET_ARCHITECTURE # switch to esame mode |
25d83cbf | 50 | sam64 # switch to 64 bit addressing mode |
5d3f229f HC |
51 | basr %r13,0 |
52 | .back_base: | |
53 | oi have_diag308-.back_base(%r13),0x01 | |
54 | lctlg %c0,%c15,ctlregs-.back_base(%r13) | |
55 | lmg %r0,%r15,gprregs-.back_base(%r13) | |
56 | j .top | |
57 | .back_pgm: | |
58 | lmg %r0,%r15,gprregs-.base(%r13) | |
cf13f0ea | 59 | .top: |
f1c1174f HC |
60 | lghi %r7,PAGE_SIZE # load PAGE_SIZE in r7 |
61 | lghi %r9,PAGE_SIZE # load PAGE_SIZE in r9 | |
25d83cbf HC |
62 | lg %r5,0(%r2) # read another word for indirection page |
63 | aghi %r2,8 # increment pointer | |
64 | tml %r5,0x1 # is it a destination page? | |
65 | je .indir_check # NO, goto "indir_check" | |
66 | lgr %r6,%r5 # r6 = r5 | |
67 | nill %r6,0xf000 # mask it out and... | |
68 | j .top # ...next iteration | |
cf13f0ea | 69 | .indir_check: |
25d83cbf HC |
70 | tml %r5,0x2 # is it a indirection page? |
71 | je .done_test # NO, goto "done_test" | |
72 | nill %r5,0xf000 # YES, mask out, | |
73 | lgr %r2,%r5 # move it into the right register, | |
74 | j .top # and read next... | |
cf13f0ea | 75 | .done_test: |
25d83cbf HC |
76 | tml %r5,0x4 # is it the done indicator? |
77 | je .source_test # NO! Well, then it should be the source indicator... | |
78 | j .done # ok, lets finish it here... | |
cf13f0ea | 79 | .source_test: |
25d83cbf HC |
80 | tml %r5,0x8 # it should be a source indicator... |
81 | je .top # NO, ignore it... | |
82 | lgr %r8,%r5 # r8 = r5 | |
83 | nill %r8,0xf000 # masking | |
84 | 0: mvcle %r6,%r8,0x0 # copy PAGE_SIZE bytes from r8 to r6 - pad with 0 | |
cf13f0ea | 85 | jo 0b |
25d83cbf | 86 | j .top |
cf13f0ea | 87 | .done: |
25d83cbf HC |
88 | sgr %r0,%r0 # clear register r0 |
89 | la %r4,load_psw-.base(%r13) # load psw-address into the register | |
90 | o %r3,4(%r4) # or load address into psw | |
cf13f0ea | 91 | st %r3,4(%r4) |
25d83cbf | 92 | mvc 0(8,%r0),0(%r4) # copy psw to absolute address 0 |
5d3f229f HC |
93 | tm have_diag308-.base(%r13),0x01 |
94 | jno .no_diag308 | |
95 | diag %r0,%r0,0x308 | |
96 | .no_diag308: | |
25d83cbf HC |
97 | sam31 # 31 bit mode |
98 | sr %r1,%r1 # erase register r1 | |
99 | sr %r2,%r2 # erase register r2 | |
eb546195 | 100 | sigp %r1,%r2,SIGP_SET_ARCHITECTURE # set cpuid to zero |
25d83cbf | 101 | lpsw 0 # hopefully start new kernel... |
cf13f0ea | 102 | |
25d83cbf | 103 | .align 8 |
cf13f0ea HC |
104 | load_psw: |
105 | .long 0x00080000,0x80000000 | |
106 | sys_msk: | |
107 | .quad 0 | |
5d3f229f HC |
108 | ctlregs: |
109 | .rept 16 | |
110 | .quad 0 | |
111 | .endr | |
112 | gprregs: | |
113 | .rept 16 | |
114 | .quad 0 | |
115 | .endr | |
116 | have_diag308: | |
117 | .byte 0 | |
118 | .align 8 | |
cf13f0ea | 119 | relocate_kernel_end: |
144d634a | 120 | .align 8 |
cf13f0ea HC |
121 | .globl relocate_kernel_len |
122 | relocate_kernel_len: | |
123 | .quad relocate_kernel_end - relocate_kernel |