2 * arch/s390/kernel/relocate_kernel.S
4 * (C) Copyright IBM Corp. 2005
6 * Author(s): Rolf Adelsberger,
7 * Heiko Carstens <heiko.carstens@de.ibm.com>
11 #include <linux/linkage.h>
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...
19 * %r5 will be used as temp. storage
20 * %r6 holds the destination address
22 * %r8 holds the source address
28 ENTRY(relocate_kernel)
29 basr %r13,0 # base address
31 stnsm sys_msk-.base(%r13),0xfb # disable DAT
32 stctl %c0,%c15,ctlregs-.base(%r13)
33 stm %r0,%r15,gprregs-.base(%r13)
34 la %r1,load_psw-.base(%r13)
36 la %r0,.back-.base(%r13)
39 mvc 0x68(8,%r0),0(%r1)
40 la %r0,.back_pgm-.base(%r13)
48 oi have_diag308-.back_base(%r13),0x01
49 lctl %c0,%c15,ctlregs-.back_base(%r13)
50 lm %r0,%r15,gprregs-.back_base(%r13)
53 lm %r0,%r15,gprregs-.base(%r13)
55 lhi %r10,-1 # preparing the mask
56 sll %r10,12 # shift it such that it becomes 0xf000
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"
65 nr %r6,%r10 # mask it out and...
66 j .top # ...next iteration
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...
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...
78 tml %r5,0x8 # it should be a source indicator...
79 je .top # NO, ignore it...
82 0: mvcle %r6,%r8,0x0 # copy PAGE_SIZE bytes from r8 to r6 - pad with 0
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
90 mvc 0(8,%r0),0(%r4) # copy psw to absolute address 0
91 tm have_diag308-.base(%r13),0x01
95 sr %r1,%r1 # clear %r1
96 sr %r2,%r2 # clear %r2
97 sigp %r1,%r2,SIGP_SET_ARCHITECTURE # set cpuid to zero
98 lpsw 0 # hopefully start new kernel...
102 .long 0x00080000,0x80000000
118 .globl relocate_kernel_len
120 .quad relocate_kernel_end - relocate_kernel