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review.shift-gmbh.com / SHIFTPHONES / mainline / linux / 144d634a21caff1d54cb4bb0d073774e88130045 / . / arch / s390 / kernel / relocate_kernel64.S
blob: 7c3ce589a7f0cdb3ceef2b08d24977b504f80a23 [file] [log] [blame]
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]1/*
2 * arch/s390/kernel/relocate_kernel64.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>
12
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]13/*
14 * moves the new kernel to its destination...
15 * %r2 = pointer to first kimage_entry_t
16 * %r3 = start address - where to jump to after the job is done...
17 *
18 * %r5 will be used as temp. storage
19 * %r6 holds the destination address
20 * %r7 = PAGE_SIZE
21 * %r8 holds the source address
22 * %r9 = PAGE_SIZE
23 *
24 * 0xf000 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 stctg %c0,%c15,ctlregs-.base(%r13)
33 stmg %r0,%r15,gprregs-.base(%r13)
34 lghi %r0,3
35 sllg %r0,%r0,31
36 stg %r0,0x1d0(%r0)
37 la %r0,.back_pgm-.base(%r13)
38 stg %r0,0x1d8(%r0)
39 la %r1,load_psw-.base(%r13)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]40 mvc 0(8,%r0),0(%r1)
Heiko Carstens5d3f2292005-08-01 21:11:33 -0700[diff] [blame]41 la %r0,.back-.base(%r13)
42 st %r0,4(%r0)
43 oi 4(%r0),0x80
44 lghi %r0,0
45 diag %r0,%r0,0x308
46 .back:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]47 lhi %r1,1 # mode 1 = esame
48 sigp %r1,%r0,0x12 # switch to esame mode
49 sam64 # switch to 64 bit addressing mode
Heiko Carstens5d3f2292005-08-01 21:11:33 -0700[diff] [blame]50 basr %r13,0
51 .back_base:
52 oi have_diag308-.back_base(%r13),0x01
53 lctlg %c0,%c15,ctlregs-.back_base(%r13)
54 lmg %r0,%r15,gprregs-.back_base(%r13)
55 j .top
56 .back_pgm:
57 lmg %r0,%r15,gprregs-.base(%r13)
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]58 .top:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]59 lghi %r7,4096 # load PAGE_SIZE in r7
60 lghi %r9,4096 # load PAGE_SIZE in r9
61 lg %r5,0(%r2) # read another word for indirection page
62 aghi %r2,8 # increment pointer
63 tml %r5,0x1 # is it a destination page?
64 je .indir_check # NO, goto "indir_check"
65 lgr %r6,%r5 # r6 = r5
66 nill %r6,0xf000 # mask it out and...
67 j .top # ...next iteration
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]68 .indir_check:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]69 tml %r5,0x2 # is it a indirection page?
70 je .done_test # NO, goto "done_test"
71 nill %r5,0xf000 # YES, mask out,
72 lgr %r2,%r5 # move it into the right register,
73 j .top # and read next...
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]74 .done_test:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]75 tml %r5,0x4 # is it the done indicator?
76 je .source_test # NO! Well, then it should be the source indicator...
77 j .done # ok, lets finish it here...
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]78 .source_test:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]79 tml %r5,0x8 # it should be a source indicator...
80 je .top # NO, ignore it...
81 lgr %r8,%r5 # r8 = r5
82 nill %r8,0xf000 # masking
83 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]84 jo 0b
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]85 j .top
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]86 .done:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]87 sgr %r0,%r0 # clear register r0
88 la %r4,load_psw-.base(%r13) # load psw-address into the register
89 o %r3,4(%r4) # or load address into psw
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]90 st %r3,4(%r4)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]91 mvc 0(8,%r0),0(%r4) # copy psw to absolute address 0
Heiko Carstens5d3f2292005-08-01 21:11:33 -0700[diff] [blame]92 tm have_diag308-.base(%r13),0x01
93 jno .no_diag308
94 diag %r0,%r0,0x308
95 .no_diag308:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]96 sam31 # 31 bit mode
97 sr %r1,%r1 # erase register r1
98 sr %r2,%r2 # erase register r2
99 sigp %r1,%r2,0x12 # set cpuid to zero
100 lpsw 0 # hopefully start new kernel...
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]101
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]102 .align 8
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]103 load_psw:
104 .long 0x00080000,0x80000000
105 sys_msk:
106 .quad 0
Heiko Carstens5d3f2292005-08-01 21:11:33 -0700[diff] [blame]107 ctlregs:
108 .rept 16
109 .quad 0
110 .endr
111 gprregs:
112 .rept 16
113 .quad 0
114 .endr
115 have_diag308:
116 .byte 0
117 .align 8
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]118 relocate_kernel_end:
Jan Glauber144d6342011-07-24 10:48:19 +0200[diff] [blame^]119 .align 8
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]120 .globl relocate_kernel_len
121 relocate_kernel_len:
122 .quad relocate_kernel_end - relocate_kernel