1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright IBM Corp. 2005
5 * Author(s): Rolf Adelsberger,
6 * Heiko Carstens <heiko.carstens@de.ibm.com>
10 #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
25 * 0xf000 is a page_mask
29 ENTRY(relocate_kernel)
30 basr %r13,0 # base address
32 stnsm sys_msk-.base(%r13),0xfb # disable DAT
33 stctg %c0,%c15,ctlregs-.base(%r13)
34 stmg %r0,%r15,gprregs-.base(%r13)
38 la %r0,.back_pgm-.base(%r13)
40 la %r1,load_psw-.base(%r13)
42 la %r0,.back-.base(%r13)
48 lhi %r1,1 # mode 1 = esame
49 sigp %r1,%r0,SIGP_SET_ARCHITECTURE # switch to esame mode
50 sam64 # switch to 64 bit addressing mode
53 oi have_diag308-.back_base(%r13),0x01
54 lctlg %c0,%c15,ctlregs-.back_base(%r13)
55 lmg %r0,%r15,gprregs-.back_base(%r13)
58 lmg %r0,%r15,gprregs-.base(%r13)
60 lghi %r7,PAGE_SIZE # load PAGE_SIZE in r7
61 lghi %r9,PAGE_SIZE # 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"
67 nill %r6,0xf000 # mask it out and...
68 j .top # ...next iteration
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...
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...
80 tml %r5,0x8 # it should be a source indicator...
81 je .top # NO, ignore it...
83 nill %r8,0xf000 # masking
84 0: mvcle %r6,%r8,0x0 # copy PAGE_SIZE bytes from r8 to r6 - pad with 0
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
92 mvc 0(8,%r0),0(%r4) # copy psw to absolute address 0
93 tm have_diag308-.base(%r13),0x01
98 sr %r1,%r1 # erase register r1
99 sr %r2,%r2 # erase register r2
100 sigp %r1,%r2,SIGP_SET_ARCHITECTURE # set cpuid to zero
101 lpsw 0 # hopefully start new kernel...
105 .long 0x00080000,0x80000000
121 .globl relocate_kernel_len
123 .quad relocate_kernel_end - relocate_kernel