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/*
* arch/s390/boot/ipldump.S
*
* S390 version
* Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
*
* Tape dump ipl record. Put it on a tape and ipl from it and it will
* write a dump of the real storage after the ipl record on that tape.
*/
#include <asm/setup.h>
#include <asm/lowcore.h>
#define IPL_BS 1024
.org 0
.long 0x00080000,0x80000000+_start # The first 24 bytes are loaded
.long 0x07000000,0x60000001 # by ipl to addresses 0-23.
.long 0x02000000,0x20000000+IPL_BS # (a PSW and two CCWs).
.long 0x00000000,0x00000000
.long 0x00000000,0x00000000 # svc old psw
.long 0x00000000,0x00000000 # program check old psw
.long 0x00000000,0x00000000 # machine check old psw
.long 0x00000000,0x00000000 # io old psw
.long 0x00000000,0x00000000
.long 0x00000000,0x00000000
.long 0x00000000,0x00000000
.long 0x000a0000,0x00000058 # external new psw
.long 0x000a0000,0x00000060 # svc new psw
.long 0x000a0000,0x00000068 # program check new psw
.long 0x000a0000,0x00000070 # machine check new psw
.long 0x00080000,0x80000000+.Lioint # io new psw
.org 0x100
.globl _start
_start:
l %r1,0xb8 # load ipl subchannel number
#
# find out memory size
#
mvc 104(8),.Lpcmem0 # setup program check handler
slr %r3,%r3
lhi %r2,1
sll %r2,20
.Lloop0:
l %r0,0(%r3) # test page
ar %r3,%r2 # add 1M
jnm .Lloop0 # r1 < 0x80000000 -> loop
.Lchkmem0:
n %r3,.L4malign0 # align to multiples of 4M
st %r3,.Lmemsize # store memory size
.Lmemok:
#
# first write a tape mark
#
bras %r14,.Ltapemark
#
# write real storage to tape
#
slr %r2,%r2 # start at address 0
bras %r14,.Lwriter # load ramdisk
#
# write another tape mark
#
bras %r14,.Ltapemark
#
# everything written, stop processor
#
lpsw .Lstopped
#
# subroutine for writing to tape
# Paramters:
# R1 = device number
# R2 = start address
# R3 = length
.Lwriter:
st %r14,.Lldret
la %r12,.Lorbread # r12 = address of orb
la %r5,.Lirb # r5 = address of irb
st %r2,.Lccwwrite+4 # initialize CCW data addresses
lctl %c6,%c6,.Lcr6
slr %r2,%r2
.Lldlp:
lhi %r6,3 # 3 retries
.Lssch:
ssch 0(%r12) # write chunk of IPL_BS bytes
jnz .Llderr
.Lw4end:
bras %r14,.Lwait4io
tm 8(%r5),0x82 # do we have a problem ?
jnz .Lrecov
l %r0,.Lccwwrite+4 # update CCW data addresses
ahi %r0,IPL_BS
st %r0,.Lccwwrite+4
clr %r0,%r3 # enough ?
jl .Lldlp
.Ldone:
l %r14,.Lldret
br %r14 # r2 contains the total size
.Lrecov:
bras %r14,.Lsense # do the sensing
brct %r6,.Lssch # dec. retry count & branch
j .Llderr
.Ltapemark:
st %r14,.Lldret
la %r12,.Lorbmark # r12 = address of orb
la %r5,.Lirb # r5 = address of irb
lctl %c6,%c6,.Lcr6
ssch 0(%r12) # write a tape mark
jnz .Llderr
bras %r14,.Lwait4io
l %r14,.Lldret
br %r14
#
# Sense subroutine
#
.Lsense:
st %r14,.Lsnsret
la %r7,.Lorbsense
ssch 0(%r7) # start sense command
jnz .Llderr
bras %r14,.Lwait4io
l %r14,.Lsnsret
tm 8(%r5),0x82 # do we have a problem ?
jnz .Llderr
br %r14
#
# Wait for interrupt subroutine
#
.Lwait4io:
lpsw .Lwaitpsw
.Lioint:
c %r1,0xb8 # compare subchannel number
jne .Lwait4io
tsch 0(%r5)
slr %r0,%r0
tm 8(%r5),0x82 # do we have a problem ?
jnz .Lwtexit
tm 8(%r5),0x04 # got device end ?
jz .Lwait4io
.Lwtexit:
br %r14
.Llderr:
lpsw .Lcrash
.align 8
.Lorbread:
.long 0x00000000,0x0080ff00,.Lccwwrite
.align 8
.Lorbsense:
.long 0x00000000,0x0080ff00,.Lccwsense
.align 8
.Lorbmark:
.long 0x00000000,0x0080ff00,.Lccwmark
.align 8
.Lccwwrite:
.long 0x01200000+IPL_BS,0x00000000
.Lccwsense:
.long 0x04200001,0x00000000
.Lccwmark:
.long 0x1f200001,0x00000000
.Lwaitpsw:
.long 0x020a0000,0x80000000+.Lioint
.Lirb: .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
.Lcr6: .long 0xff000000
.align 8
.Lcrash:.long 0x000a0000,0x00000000
.Lstopped: .long 0x000a0000,0x00001234
.Lpcmem0:.long 0x00080000,0x80000000 + .Lchkmem0
.L4malign0:.long 0xffc00000
.Lmemsize:.long 0
.Lldret:.long 0
.Lsnsret: .long 0
.org IPL_BS
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