5d3f229fcd
Disable pseudo page fault handling before starting the new kernel and try to use diag308 to reset the machine. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
124 lines
3.2 KiB
ArmAsm
124 lines
3.2 KiB
ArmAsm
/*
|
|
* arch/s390/kernel/relocate_kernel64.S
|
|
*
|
|
* (C) Copyright IBM Corp. 2005
|
|
*
|
|
* Author(s): Rolf Adelsberger <adelsberger@de.ibm.com>
|
|
* Heiko Carstens <heiko.carstens@de.ibm.com>
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* 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
|
|
*
|
|
* 0xf000 is a page_mask
|
|
*/
|
|
|
|
.text
|
|
.globl relocate_kernel
|
|
relocate_kernel:
|
|
basr %r13,0 #base address
|
|
.base:
|
|
stnsm sys_msk-.base(%r13),0xf8 #disable DAT and IRQs
|
|
spx zero64-.base(%r13) #absolute addressing mode
|
|
stctg %c0,%c15,ctlregs-.base(%r13)
|
|
stmg %r0,%r15,gprregs-.base(%r13)
|
|
lghi %r0,3
|
|
sllg %r0,%r0,31
|
|
stg %r0,0x1d0(%r0)
|
|
la %r0,.back_pgm-.base(%r13)
|
|
stg %r0,0x1d8(%r0)
|
|
la %r1,load_psw-.base(%r13)
|
|
mvc 0(8,%r0),0(%r1)
|
|
la %r0,.back-.base(%r13)
|
|
st %r0,4(%r0)
|
|
oi 4(%r0),0x80
|
|
lghi %r0,0
|
|
diag %r0,%r0,0x308
|
|
.back:
|
|
lhi %r1,1 #mode 1 = esame
|
|
sigp %r1,%r0,0x12 #switch to esame mode
|
|
sam64 #switch to 64 bit addressing mode
|
|
basr %r13,0
|
|
.back_base:
|
|
oi have_diag308-.back_base(%r13),0x01
|
|
lctlg %c0,%c15,ctlregs-.back_base(%r13)
|
|
lmg %r0,%r15,gprregs-.back_base(%r13)
|
|
j .top
|
|
.back_pgm:
|
|
lmg %r0,%r15,gprregs-.base(%r13)
|
|
.top:
|
|
lghi %r7,4096 #load PAGE_SIZE in r7
|
|
lghi %r9,4096 #load PAGE_SIZE in r9
|
|
lg %r5,0(%r2) #read another word for indirection page
|
|
aghi %r2,8 #increment pointer
|
|
tml %r5,0x1 #is it a destination page?
|
|
je .indir_check #NO, goto "indir_check"
|
|
lgr %r6,%r5 #r6 = r5
|
|
nill %r6,0xf000 #mask it out and...
|
|
j .top #...next iteration
|
|
.indir_check:
|
|
tml %r5,0x2 #is it a indirection page?
|
|
je .done_test #NO, goto "done_test"
|
|
nill %r5,0xf000 #YES, mask out,
|
|
lgr %r2,%r5 #move it into the right register,
|
|
j .top #and read next...
|
|
.done_test:
|
|
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...
|
|
.source_test:
|
|
tml %r5,0x8 #it should be a source indicator...
|
|
je .top #NO, ignore it...
|
|
lgr %r8,%r5 #r8 = r5
|
|
nill %r8,0xf000 #masking
|
|
0: mvcle %r6,%r8,0x0 #copy PAGE_SIZE bytes from r8 to r6 - pad with 0
|
|
jo 0b
|
|
j .top
|
|
.done:
|
|
sgr %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
|
|
st %r3,4(%r4)
|
|
mvc 0(8,%r0),0(%r4) #copy psw to absolute address 0
|
|
tm have_diag308-.base(%r13),0x01
|
|
jno .no_diag308
|
|
diag %r0,%r0,0x308
|
|
.no_diag308:
|
|
sam31 #31 bit mode
|
|
sr %r1,%r1 #erase register r1
|
|
sr %r2,%r2 #erase register r2
|
|
sigp %r1,%r2,0x12 #set cpuid to zero
|
|
lpsw 0 #hopefully start new kernel...
|
|
|
|
.align 8
|
|
zero64:
|
|
.quad 0
|
|
load_psw:
|
|
.long 0x00080000,0x80000000
|
|
sys_msk:
|
|
.quad 0
|
|
ctlregs:
|
|
.rept 16
|
|
.quad 0
|
|
.endr
|
|
gprregs:
|
|
.rept 16
|
|
.quad 0
|
|
.endr
|
|
have_diag308:
|
|
.byte 0
|
|
.align 8
|
|
relocate_kernel_end:
|
|
.globl relocate_kernel_len
|
|
relocate_kernel_len:
|
|
.quad relocate_kernel_end - relocate_kernel
|