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gerrit-public.fairphone.software / kernel / msm-5.4 / 2b7547578b9fdf811072cfc0c3594eb370e7d219 / . / arch / s390 / kernel / relocate_kernel.S
blob: bfad96a64222a261e0d508b607b19a519c938d2e [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
Jan Glauber144d6342011-07-24 10:48:19 +0200[diff] [blame]11#include <linux/linkage.h>
Heiko Carstenseb546192012-06-04 15:05:43 +0200[diff] [blame]12#include <asm/sigp.h>
Jan Glauber144d6342011-07-24 10:48:19 +0200[diff] [blame]13
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]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 * %r10 is a page mask
25 */
26
27 .text
Jan Glauber144d6342011-07-24 10:48:19 +0200[diff] [blame]28ENTRY(relocate_kernel)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]29 basr %r13,0 # base address
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]30 .base:
Heiko Carstens15e9b582006-12-04 15:40:26 +0100[diff] [blame]31 stnsm sys_msk-.base(%r13),0xfb # disable DAT
Heiko Carstens5d3f2292005-08-01 21:11:33 -0700[diff] [blame]32 stctl %c0,%c15,ctlregs-.base(%r13)
33 stm %r0,%r15,gprregs-.base(%r13)
34 la %r1,load_psw-.base(%r13)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]35 mvc 0(8,%r0),0(%r1)
Heiko Carstens5d3f2292005-08-01 21:11:33 -0700[diff] [blame]36 la %r0,.back-.base(%r13)
37 st %r0,4(%r0)
38 oi 4(%r0),0x80
39 mvc 0x68(8,%r0),0(%r1)
40 la %r0,.back_pgm-.base(%r13)
41 st %r0,0x6c(%r0)
42 oi 0x6c(%r0),0x80
43 lhi %r0,0
44 diag %r0,%r0,0x308
45 .back:
46 basr %r13,0
47 .back_base:
48 oi have_diag308-.back_base(%r13),0x01
49 lctl %c0,%c15,ctlregs-.back_base(%r13)
50 lm %r0,%r15,gprregs-.back_base(%r13)
51 j .start_reloc
52 .back_pgm:
53 lm %r0,%r15,gprregs-.base(%r13)
54 .start_reloc:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]55 lhi %r10,-1 # preparing the mask
56 sll %r10,12 # shift it such that it becomes 0xf000
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]57 .top:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]58 lhi %r7,4096 # load PAGE_SIZE in r7
59 lhi %r9,4096 # load PAGE_SIZE in r9
60 l %r5,0(%r2) # read another word for indirection page
61 ahi %r2,4 # increment pointer
62 tml %r5,0x1 # is it a destination page?
63 je .indir_check # NO, goto "indir_check"
64 lr %r6,%r5 # r6 = r5
65 nr %r6,%r10 # mask it out and...
66 j .top # ...next iteration
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]67 .indir_check:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]68 tml %r5,0x2 # is it a indirection page?
69 je .done_test # NO, goto "done_test"
70 nr %r5,%r10 # YES, mask out,
71 lr %r2,%r5 # move it into the right register,
72 j .top # and read next...
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]73 .done_test:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]74 tml %r5,0x4 # is it the done indicator?
75 je .source_test # NO! Well, then it should be the source indicator...
76 j .done # ok, lets finish it here...
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]77 .source_test:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]78 tml %r5,0x8 # it should be a source indicator...
79 je .top # NO, ignore it...
80 lr %r8,%r5 # r8 = r5
81 nr %r8,%r10 # masking
82 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]83 jo 0b
84 j .top
85 .done:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]86 sr %r0,%r0 # clear register r0
87 la %r4,load_psw-.base(%r13) # load psw-address into the register
88 o %r3,4(%r4) # or load address into psw
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]89 st %r3,4(%r4)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]90 mvc 0(8,%r0),0(%r4) # copy psw to absolute address 0
Heiko Carstens5d3f2292005-08-01 21:11:33 -0700[diff] [blame]91 tm have_diag308-.base(%r13),0x01
92 jno .no_diag308
93 diag %r0,%r0,0x308
94 .no_diag308:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]95 sr %r1,%r1 # clear %r1
96 sr %r2,%r2 # clear %r2
Heiko Carstenseb546192012-06-04 15:05:43 +0200[diff] [blame]97 sigp %r1,%r2,SIGP_SET_ARCHITECTURE # set cpuid to zero
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]98 lpsw 0 # hopefully start new kernel...
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]99
100 .align 8
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]101 load_psw:
102 .long 0x00080000,0x80000000
103 sys_msk:
104 .quad 0
Heiko Carstens5d3f2292005-08-01 21:11:33 -0700[diff] [blame]105 ctlregs:
106 .rept 16
107 .long 0
108 .endr
109 gprregs:
110 .rept 16
111 .long 0
112 .endr
113 have_diag308:
114 .byte 0
115 .align 8
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]116 relocate_kernel_end:
Jan Glauber144d6342011-07-24 10:48:19 +0200[diff] [blame]117 .align 8
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]118 .globl relocate_kernel_len
119 relocate_kernel_len:
120 .quad relocate_kernel_end - relocate_kernel