2005-06-25 15:58:11 -06:00
|
|
|
/*
|
|
|
|
* arch/s390/kernel/relocate_kernel.S
|
|
|
|
*
|
|
|
|
* (C) Copyright IBM Corp. 2005
|
|
|
|
*
|
2006-09-28 08:56:37 -06:00
|
|
|
* Author(s): Rolf Adelsberger,
|
2005-08-01 22:11:33 -06:00
|
|
|
* Heiko Carstens <heiko.carstens@de.ibm.com>
|
2005-06-25 15:58:11 -06:00
|
|
|
*
|
|
|
|
*/
|
|
|
|
|
2011-07-24 02:48:19 -06:00
|
|
|
#include <linux/linkage.h>
|
2012-06-04 07:05:43 -06:00
|
|
|
#include <asm/sigp.h>
|
2011-07-24 02:48:19 -06:00
|
|
|
|
2005-06-25 15:58:11 -06:00
|
|
|
/*
|
|
|
|
* moves the new kernel to its destination...
|
|
|
|
* %r2 = pointer to first kimage_entry_t
|
|
|
|
* %r3 = start address - where to jump to after the job is done...
|
|
|
|
*
|
|
|
|
* %r5 will be used as temp. storage
|
|
|
|
* %r6 holds the destination address
|
|
|
|
* %r7 = PAGE_SIZE
|
|
|
|
* %r8 holds the source address
|
|
|
|
* %r9 = PAGE_SIZE
|
|
|
|
* %r10 is a page mask
|
|
|
|
*/
|
|
|
|
|
|
|
|
.text
|
2011-07-24 02:48:19 -06:00
|
|
|
ENTRY(relocate_kernel)
|
2006-09-28 08:56:37 -06:00
|
|
|
basr %r13,0 # base address
|
2005-06-25 15:58:11 -06:00
|
|
|
.base:
|
2006-12-04 07:40:26 -07:00
|
|
|
stnsm sys_msk-.base(%r13),0xfb # disable DAT
|
2005-08-01 22:11:33 -06:00
|
|
|
stctl %c0,%c15,ctlregs-.base(%r13)
|
|
|
|
stm %r0,%r15,gprregs-.base(%r13)
|
|
|
|
la %r1,load_psw-.base(%r13)
|
2006-09-28 08:56:37 -06:00
|
|
|
mvc 0(8,%r0),0(%r1)
|
2005-08-01 22:11:33 -06:00
|
|
|
la %r0,.back-.base(%r13)
|
|
|
|
st %r0,4(%r0)
|
|
|
|
oi 4(%r0),0x80
|
|
|
|
mvc 0x68(8,%r0),0(%r1)
|
|
|
|
la %r0,.back_pgm-.base(%r13)
|
|
|
|
st %r0,0x6c(%r0)
|
|
|
|
oi 0x6c(%r0),0x80
|
|
|
|
lhi %r0,0
|
|
|
|
diag %r0,%r0,0x308
|
|
|
|
.back:
|
|
|
|
basr %r13,0
|
|
|
|
.back_base:
|
|
|
|
oi have_diag308-.back_base(%r13),0x01
|
|
|
|
lctl %c0,%c15,ctlregs-.back_base(%r13)
|
|
|
|
lm %r0,%r15,gprregs-.back_base(%r13)
|
|
|
|
j .start_reloc
|
|
|
|
.back_pgm:
|
|
|
|
lm %r0,%r15,gprregs-.base(%r13)
|
|
|
|
.start_reloc:
|
2006-09-28 08:56:37 -06:00
|
|
|
lhi %r10,-1 # preparing the mask
|
|
|
|
sll %r10,12 # shift it such that it becomes 0xf000
|
2005-06-25 15:58:11 -06:00
|
|
|
.top:
|
2006-09-28 08:56:37 -06:00
|
|
|
lhi %r7,4096 # load PAGE_SIZE in r7
|
|
|
|
lhi %r9,4096 # load PAGE_SIZE in r9
|
|
|
|
l %r5,0(%r2) # read another word for indirection page
|
|
|
|
ahi %r2,4 # increment pointer
|
|
|
|
tml %r5,0x1 # is it a destination page?
|
|
|
|
je .indir_check # NO, goto "indir_check"
|
|
|
|
lr %r6,%r5 # r6 = r5
|
|
|
|
nr %r6,%r10 # mask it out and...
|
|
|
|
j .top # ...next iteration
|
2005-06-25 15:58:11 -06:00
|
|
|
.indir_check:
|
2006-09-28 08:56:37 -06:00
|
|
|
tml %r5,0x2 # is it a indirection page?
|
|
|
|
je .done_test # NO, goto "done_test"
|
|
|
|
nr %r5,%r10 # YES, mask out,
|
|
|
|
lr %r2,%r5 # move it into the right register,
|
|
|
|
j .top # and read next...
|
2005-06-25 15:58:11 -06:00
|
|
|
.done_test:
|
2006-09-28 08:56:37 -06:00
|
|
|
tml %r5,0x4 # is it the done indicator?
|
|
|
|
je .source_test # NO! Well, then it should be the source indicator...
|
|
|
|
j .done # ok, lets finish it here...
|
2005-06-25 15:58:11 -06:00
|
|
|
.source_test:
|
2006-09-28 08:56:37 -06:00
|
|
|
tml %r5,0x8 # it should be a source indicator...
|
|
|
|
je .top # NO, ignore it...
|
|
|
|
lr %r8,%r5 # r8 = r5
|
|
|
|
nr %r8,%r10 # masking
|
|
|
|
0: mvcle %r6,%r8,0x0 # copy PAGE_SIZE bytes from r8 to r6 - pad with 0
|
2005-06-25 15:58:11 -06:00
|
|
|
jo 0b
|
|
|
|
j .top
|
|
|
|
.done:
|
2006-09-28 08:56:37 -06:00
|
|
|
sr %r0,%r0 # clear register r0
|
|
|
|
la %r4,load_psw-.base(%r13) # load psw-address into the register
|
|
|
|
o %r3,4(%r4) # or load address into psw
|
2005-06-25 15:58:11 -06:00
|
|
|
st %r3,4(%r4)
|
2006-09-28 08:56:37 -06:00
|
|
|
mvc 0(8,%r0),0(%r4) # copy psw to absolute address 0
|
2005-08-01 22:11:33 -06:00
|
|
|
tm have_diag308-.base(%r13),0x01
|
|
|
|
jno .no_diag308
|
|
|
|
diag %r0,%r0,0x308
|
|
|
|
.no_diag308:
|
2006-09-28 08:56:37 -06:00
|
|
|
sr %r1,%r1 # clear %r1
|
|
|
|
sr %r2,%r2 # clear %r2
|
2012-06-04 07:05:43 -06:00
|
|
|
sigp %r1,%r2,SIGP_SET_ARCHITECTURE # set cpuid to zero
|
2006-09-28 08:56:37 -06:00
|
|
|
lpsw 0 # hopefully start new kernel...
|
2005-06-25 15:58:11 -06:00
|
|
|
|
|
|
|
.align 8
|
|
|
|
load_psw:
|
|
|
|
.long 0x00080000,0x80000000
|
|
|
|
sys_msk:
|
|
|
|
.quad 0
|
2005-08-01 22:11:33 -06:00
|
|
|
ctlregs:
|
|
|
|
.rept 16
|
|
|
|
.long 0
|
|
|
|
.endr
|
|
|
|
gprregs:
|
|
|
|
.rept 16
|
|
|
|
.long 0
|
|
|
|
.endr
|
|
|
|
have_diag308:
|
|
|
|
.byte 0
|
|
|
|
.align 8
|
2005-06-25 15:58:11 -06:00
|
|
|
relocate_kernel_end:
|
2011-07-24 02:48:19 -06:00
|
|
|
.align 8
|
2005-06-25 15:58:11 -06:00
|
|
|
.globl relocate_kernel_len
|
|
|
|
relocate_kernel_len:
|
|
|
|
.quad relocate_kernel_end - relocate_kernel
|