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review.shift-gmbh.com / SHIFTPHONES / mainline / linux / 6c80731c75bd3289d35b89a21a4e317cbcb306e3 / . / arch / s390 / kernel / relocate_kernel.S
blob: cfac28330b03f271726bf8b1d61ee74c7ceac5a7 [file] [log] [blame]
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]1/*
Heiko Carstensa53c8fa2012-07-20 11:15:04 +0200[diff] [blame]2 * Copyright IBM Corp. 2005
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]3 *
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]4 * Author(s): Rolf Adelsberger,
Heiko Carstens5d3f2292005-08-01 21:11:33 -0700[diff] [blame]5 * Heiko Carstens <heiko.carstens@de.ibm.com>
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]6 *
7 */
8
Jan Glauber144d6342011-07-24 10:48:19 +0200[diff] [blame]9#include <linux/linkage.h>
Heiko Carstenseb546192012-06-04 15:05:43 +0200[diff] [blame]10#include <asm/sigp.h>
Jan Glauber144d6342011-07-24 10:48:19 +0200[diff] [blame]11
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]12/*
13 * moves the new kernel to its destination...
14 * %r2 = pointer to first kimage_entry_t
15 * %r3 = start address - where to jump to after the job is done...
16 *
17 * %r5 will be used as temp. storage
18 * %r6 holds the destination address
19 * %r7 = PAGE_SIZE
20 * %r8 holds the source address
21 * %r9 = PAGE_SIZE
22 *
23 * 0xf000 is a page_mask
24 */
25
26 .text
Jan Glauber144d6342011-07-24 10:48:19 +0200[diff] [blame]27ENTRY(relocate_kernel)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]28 basr %r13,0 # base address
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]29 .base:
Heiko Carstens15e9b582006-12-04 15:40:26 +0100[diff] [blame]30 stnsm sys_msk-.base(%r13),0xfb # disable DAT
Heiko Carstens5d3f2292005-08-01 21:11:33 -0700[diff] [blame]31 stctg %c0,%c15,ctlregs-.base(%r13)
32 stmg %r0,%r15,gprregs-.base(%r13)
33 lghi %r0,3
34 sllg %r0,%r0,31
35 stg %r0,0x1d0(%r0)
36 la %r0,.back_pgm-.base(%r13)
37 stg %r0,0x1d8(%r0)
38 la %r1,load_psw-.base(%r13)
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]39 mvc 0(8,%r0),0(%r1)
Heiko Carstens5d3f2292005-08-01 21:11:33 -0700[diff] [blame]40 la %r0,.back-.base(%r13)
41 st %r0,4(%r0)
42 oi 4(%r0),0x80
43 lghi %r0,0
44 diag %r0,%r0,0x308
45 .back:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]46 lhi %r1,1 # mode 1 = esame
Heiko Carstenseb546192012-06-04 15:05:43 +0200[diff] [blame]47 sigp %r1,%r0,SIGP_SET_ARCHITECTURE # switch to esame mode
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]48 sam64 # switch to 64 bit addressing mode
Heiko Carstens5d3f2292005-08-01 21:11:33 -0700[diff] [blame]49 basr %r13,0
50 .back_base:
51 oi have_diag308-.back_base(%r13),0x01
52 lctlg %c0,%c15,ctlregs-.back_base(%r13)
53 lmg %r0,%r15,gprregs-.back_base(%r13)
54 j .top
55 .back_pgm:
56 lmg %r0,%r15,gprregs-.base(%r13)
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]57 .top:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]58 lghi %r7,4096 # load PAGE_SIZE in r7
59 lghi %r9,4096 # load PAGE_SIZE in r9
60 lg %r5,0(%r2) # read another word for indirection page
61 aghi %r2,8 # increment pointer
62 tml %r5,0x1 # is it a destination page?
63 je .indir_check # NO, goto "indir_check"
64 lgr %r6,%r5 # r6 = r5
65 nill %r6,0xf000 # 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 nill %r5,0xf000 # YES, mask out,
71 lgr %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 lgr %r8,%r5 # r8 = r5
81 nill %r8,0xf000 # 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
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]84 j .top
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]85 .done:
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]86 sgr %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 sam31 # 31 bit mode
96 sr %r1,%r1 # erase register r1
97 sr %r2,%r2 # erase register r2
Heiko Carstenseb546192012-06-04 15:05:43 +0200[diff] [blame]98 sigp %r1,%r2,SIGP_SET_ARCHITECTURE # set cpuid to zero
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]99 lpsw 0 # hopefully start new kernel...
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]100
Heiko Carstens25d83cb2006-09-28 16:56:37 +0200[diff] [blame]101 .align 8
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]102 load_psw:
103 .long 0x00080000,0x80000000
104 sys_msk:
105 .quad 0
Heiko Carstens5d3f2292005-08-01 21:11:33 -0700[diff] [blame]106 ctlregs:
107 .rept 16
108 .quad 0
109 .endr
110 gprregs:
111 .rept 16
112 .quad 0
113 .endr
114 have_diag308:
115 .byte 0
116 .align 8
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]117 relocate_kernel_end:
Jan Glauber144d6342011-07-24 10:48:19 +0200[diff] [blame]118 .align 8
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700[diff] [blame]119 .globl relocate_kernel_len
120 relocate_kernel_len:
121 .quad relocate_kernel_end - relocate_kernel