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review.evervolv.com / android_kernel_oneplus_msm8996 / eb546195a7d8bc492ec6865980bf767474e74d87 / . / arch / s390 / kernel / relocate_kernel64.S
blob: 35508f335688a785b43dbe9dd7a6d3155a7b38a1 [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>
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 *
25 * 0xf000 is a page_mask
26 */
27
28 .text
Jan Glauber144d6342011-07-24 10:48:19 +0200[diff] [blame]29ENTRY(relocate_kernel)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]30 basr %r13,0 # base address
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]31 .base:
Heiko Carstens15e9b582006-12-04 15:40:26 +0100[diff] [blame]32 stnsm sys_msk-.base(%r13),0xfb # disable DAT
Heiko Carstens5d3f2292005-08-01 21:11:33 -0700[diff] [blame]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)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]41 mvc 0(8,%r0),0(%r1)
Heiko Carstens5d3f2292005-08-01 21:11:33 -0700[diff] [blame]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:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]48 lhi %r1,1 # mode 1 = esame
Heiko Carstenseb546192012-06-04 15:05:43 +0200[diff] [blame^]49 sigp %r1,%r0,SIGP_SET_ARCHITECTURE # switch to esame mode
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]50 sam64 # switch to 64 bit addressing mode
Heiko Carstens5d3f2292005-08-01 21:11:33 -0700[diff] [blame]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)
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]59 .top:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]60 lghi %r7,4096 # load PAGE_SIZE in r7
61 lghi %r9,4096 # load PAGE_SIZE in r9
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
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]69 .indir_check:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]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...
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]75 .done_test:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]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...
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]79 .source_test:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]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
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]85 jo 0b
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]86 j .top
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]87 .done:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]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
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]91 st %r3,4(%r4)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]92 mvc 0(8,%r0),0(%r4) # copy psw to absolute address 0
Heiko Carstens5d3f2292005-08-01 21:11:33 -0700[diff] [blame]93 tm have_diag308-.base(%r13),0x01
94 jno .no_diag308
95 diag %r0,%r0,0x308
96 .no_diag308:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]97 sam31 # 31 bit mode
98 sr %r1,%r1 # erase register r1
99 sr %r2,%r2 # erase register r2
Heiko Carstenseb546192012-06-04 15:05:43 +0200[diff] [blame^]100 sigp %r1,%r2,SIGP_SET_ARCHITECTURE # set cpuid to zero
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]101 lpsw 0 # hopefully start new kernel...
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]102
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]103 .align 8
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]104 load_psw:
105 .long 0x00080000,0x80000000
106 sys_msk:
107 .quad 0
Heiko Carstens5d3f2292005-08-01 21:11:33 -0700[diff] [blame]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
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]119 relocate_kernel_end:
Jan Glauber144d6342011-07-24 10:48:19 +0200[diff] [blame]120 .align 8
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]121 .globl relocate_kernel_len
122 relocate_kernel_len:
123 .quad relocate_kernel_end - relocate_kernel