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#
# Tape IPL loader
#
# Copyright IBM Corp. 2004, 2017
#
# s390-tools is free software; you can redistribute it and/or modify
# it under the terms of the MIT license. See LICENSE for details.
#
#include "boot/sigp.h"
#include "boot/linux_layout.h"
#include "boot/s390.h"
IPL_BS = 1024 # block size for tape access
IPL_OFF = 0x4000 # temporary kernel load addr
KERNEL_OFF = IMAGE_ENTRY # kernel start code offset
# relative to image start
__LC_IO_NEW_PSW = 0x1f0 # IO New PSW addr
# Default IPL parameter - will be overwritten by zIPL
RAMDISK_ORIGIN = 0x800000 # default ramdisk load addr
RAMDISK_SIZE = 0x800000 # default ramdisk size
PARMFILE_ADDR = 0x1000 # default parmfile load addr
KERNEL_ADDR = IMAGE_ENTRY # default kernel load addr
.org 0x0
.globl _start
_start:
# Stage 0 loader - loads first block of this loader
.quad PSW_LOAD+iplstart # PSW to start execution
.long 0x27000000,0x60000001 # backward Space Block
.long 0x02000000,0x20000000+IPL_BS # read IPL_BS bytes to addr 0
.long 0x00000000,0x00000000 # external old psw
.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
# IPL parameter area
.org 0x200
_parm_addr:
.quad PARMFILE_ADDR # parmfile load address
_initrd_addr:
.quad RAMDISK_ORIGIN # ramdisk load address
_load_psw:
.quad PSW_LOAD+KERNEL_ADDR # kernel start PSW
#
# Subroutine to load from tape until tape mark
#
# Parameters:
# R1 = device number
# R2 = load address
#
# Returns:
# R2 = number of bytes read
#
.Lloader:
st %r14,.Lldret # save return address
la %r3,.Lorbread # r3 = address of orb
la %r5,.Lirb # r5 = address of irb
st %r2,.Lccwread+4 # initialize CCW data addresses
lctl %c6,%c6,.Lcr6
slr %r2,%r2 # set return code to 0
.Lldlp:
la %r6,3 # 3 retries
.Lssch:
ssch 0(%r3) # load chunk of IPL_BS bytes
bnz .Llderr
.Lw4end:
bas %r14,.Lwait4io
tm 8(%r5),0x82 # do we have a problem ?
bnz .Lrecov
slr %r7,%r7
icm %r7,3,10(%r5) # get residual count
lcr %r7,%r7
la %r7,IPL_BS(%r7) # IPL_BS-residual=#bytes read
ar %r2,%r7 # add to total size
tm 8(%r5),0x01 # found a tape mark ?
bnz .Ldone
l %r0,.Lccwread+4 # update CCW data addresses
ar %r0,%r7
st %r0,.Lccwread+4
b .Lldlp
.Ldone:
l %r14,.Lldret
br %r14 # r2 contains the total size
.Lrecov:
bas %r14,.Lsense # do the sensing
bct %r6,.Lssch # dec. retry count & branch
b .Llderr
#
# Sense subroutine
#
.Lsense:
st %r14,.Lsnsret
la %r7,.Lorbsense
ssch 0(%r7) # start sense command
bnz .Llderr
bas %r14,.Lwait4io
l %r14,.Lsnsret
tm 8(%r5),0x82 # do we have a problem ?
bnz .Llderr
br %r14
#
# Wait for interrupt subroutine
#
.Lwait4io:
lpsw .Lwaitpsw
.Lioint:
c %r1,0xb8 # compare subchannel number
bne .Lwait4io
tsch 0(%r5)
slr %r0,%r0
tm 8(%r5),0x82 # do we have a problem ?
bnz .Lwtexit
tm 8(%r5),0x04 # got device end ?
bz .Lwait4io
.Lwtexit:
br %r14
.Llderr:
lpsw .Lcrash
.align 8
.Lorbread:
.long 0x00000000,0x0080ff00,.Lccwread
.align 8
.Lorbsense:
.long 0x00000000,0x0080ff00,.Lccwsense
.align 8
.Lccwread:
.long 0x02200000+IPL_BS,0x00000000
.Lccwsense:
.long 0x04200001,0x00000000
.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
.Lldret:
.long 0
.Lsnsret:
.long 0
.Lvmparamtemp:
.long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 # vm parameter space
#
# Load and initialize kernel image
#
iplstart:
stm %r0,%r15,.Lvmparamtemp # store vm params for later use
basr %r13,0
0:
la %r7,2 #/* First try code 2: */
la %r6,0 #/* 64 bit psws are restored */
sigp %r7,%r6,SIGP_SET_ARCHITECTURE #/* Switch to 64 bit */
bc 8,.Lswitched_64-0b(%r13) #/* Accepted ? */
la %r7,1 #/* Failed - try code 1 */
sigp %r7,%r6,SIGP_SET_ARCHITECTURE #/* Switch to 64 bit */
.Lswitched_64:
sam64 #/* Switch to 64 bit addr mode */
basr %r13,0
1:
mvc __LC_IO_NEW_PSW(16),4f-1b(%r13) # set i/o new ps
b .Lafterpsw
4:
.long 0x00000001,0x80000000,0x00000000,0x00000000+.Lioint # io new psw
.Lafterpsw:
l %r1,0xb8 # load rest of loader/TM
la %r2,IPL_BS
bas %r14,.Lloader
la %r3,.Lvmparamtemp # move params
la %r4,.Lvmparam
mvc 0(64,%r4),0(%r3)
l %r12,.Loffset
.Lagain0:
lr %r2,%r12 # load kernel image
bas %r14,.Lloader
clc 0(3,%r12),.L_hdr # if it is HDRx
bz .Lagain0 # skip dataset header
clc 0(3,%r12),.L_eof # if it is EOFx
bz .Lagain0 # skip dateset trailer
st %r2,.Lkernsize # store size for later use
a %r12,.Lparmarea # r12 points to parameter area
st %r1,IPL_DEVICE-PARMAREA+4(%r12) # store ipl device number
la %r2,_initrd_addr # store ramdisk address
mvc INITRD_START-PARMAREA(8,%r12),0(%r2)
#
# Load parameter file
#
l %r4,_parm_addr+4
.Lagain1:
lr %r2,%r4 # load parmfile
bas %r14,.Lloader
ltr %r2,%r2 # empty parmfile?
bz .Lnopf # skip parmfile processing
clc 0(3,%r4),.L_hdr # if it is HDRx
bz .Lagain1 # skip dataset header
clc 0(3,%r4),.L_eof # if it is EOFx
bz .Lagain1 # skip dateset trailer
chi %r2,COMMAND_LINE_SIZE-1 # truncate if line too long
bnh .Lnotrunc
la %r2,COMMAND_LINE_SIZE-1
.Lnotrunc:
la %r5,0(%r4,%r2) # search for EBCDIC chars
lr %r3,%r2
.Lidebc:
tm 0(%r5),0x80 # high order bit set ?
bo .Ldocv # yes -> convert from EBCDIC
ahi %r5,-1
bct %r3,.Lidebc
b .Lnocv
.Ldocv:
la %r3,_ebcasc
tr 0(256,%r4),0(%r3) # convert parameters to ascii
tr 256(256,%r4),0(%r3)
tr 512(256,%r4),0(%r3)
tr 768(127,%r4),0(%r3)
.Lnocv:
la %r3,COMMAND_LINE-PARMAREA(%r12) # load adr. of command line
mvc 0(256,%r3),0(%r4)
mvc 256(256,%r3),256(%r4)
mvc 512(256,%r3),512(%r4)
mvc 768(127,%r3),768(%r4)
slr %r0,%r0
b .Lcntlp
.Ldelspc:
ic %r0,0(%r2,%r3) # remove trailing spaces
chi %r0,0x20
be .Lcntlp
chi %r0,0x0a # remove trailing new line
be .Lcntlp
ahi %r2,1
b .Leolp
.Lcntlp:
brct %r2,.Ldelspc
.Leolp:
slr %r0,%r0 # nul-terminate buffer
stc %r0,0(%r2,%r3)
.Lnopf:
#
# Load initial ramdisk
#
.Lagain2:
l %r2,INITRD_START-PARMAREA+4(%r12) # load ramdisk
bas %r14,.Lloader
st %r2,INITRD_SIZE-PARMAREA+4(%r12) # store ramdisk size
ltr %r2,%r2 # check for empty file
bnz .Lrdcont
st %r2,INITRD_START-PARMAREA+4(%r12) # remove address if empty
.Lrdcont:
l %r2,INITRD_START-PARMAREA+4(%r12)
clc 0(3,%r2),.L_hdr # skip header and trailer
bz .Lagain2
clc 0(3,%r2),.L_eof
bz .Lagain2
#
# Copy kernel image to final position
#
la %r2,_load_psw # prepare copy code
la %r3,.Lcopypsw
mvc 0(8,%r3),0(%r2) # copy load psw
l %r4,_initrd_addr+4
ahi %r4,-0x100
la %r2,.Lcopystart # get copy code addr (from)
mvc 0(.Lcopyend-.Lcopystart,%r4),0(%r2) # copy code
l %r1,.Loffset # temp kernel address (from)
l %r2,4(%r3) # get kernel addr from psw (to)
n %r2,.Lpswmask
s %r2,.Lkernoff
l %r3,.Lkernsize # (length)
br %r4 # branch to copy routine
#
# Copy kernel, then load PSW
#
# R1 = from
# R2 = to
# R3 = length
#
.align 8
.Lcopystart:
clr %r1,%r2
je .Lcopyfinish # kernel is already at dest
jh .Lcopytolower # need move to lower address
# Copy last to first
ar %r1,%r3 # start from last long
ar %r2,%r3
lhi %r4,-4 # set addr increment to -4
j .Lcopygo
# Copy first to last
.Lcopytolower:
lhi %r4,4 # set addr increment to 4
.Lcopygo:
ahi %r3,3 # get size in longs
srl %r3,2
.Lcopyloop:
l %r0,0(%r1) # copy longs
st %r0,0(%r2)
ar %r1,%r4
ar %r2,%r4
brct %r3,.Lcopyloop
.Lcopyfinish:
bras %r13,.Lcopyload # set up base register
.Lcopyload:
sr %r0,%r0
la %r1,.Lcopypsw-.Lcopyload(%r13)
mvc 0(8,%r0),0(%r1) # copy load psw to 0
lm %r0,%r15,.Lvmparam-.Lcopyload(%r13) # load saved registers
lpsw 0 # start kernel
.align 8
.Lcopypsw:
.quad 0
.Lvmparam:
.long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 # vm parameter space
.Lcopyend:
.Lpswmask:
.long 0x7fffffff
.Lkernsize:
.long 0
.Lkernoff:
.long KERNEL_OFF
.Lparmarea:
.long PARMAREA
.Loffset:
.long IPL_OFF
.L_eof:
.long 0xc5d6c600 # C'EOF'
.L_hdr:
.long 0xc8c4d900 # C'HDR'
#
# EBCDIC 037 -> ASCII (IBM PC 437)
#
_ebcasc:
.byte 0x00, 0x01, 0x02, 0x03, 0x07, 0x09, 0x07, 0x7F
.byte 0x07, 0x07, 0x07, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F
.byte 0x10, 0x11, 0x12, 0x13, 0x07, 0x0A, 0x08, 0x07
.byte 0x18, 0x19, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07
.byte 0x07, 0x07, 0x1C, 0x07, 0x07, 0x0A, 0x17, 0x1B
.byte 0x07, 0x07, 0x07, 0x07, 0x07, 0x05, 0x06, 0x07
.byte 0x07, 0x07, 0x16, 0x07, 0x07, 0x07, 0x07, 0x04
.byte 0x07, 0x07, 0x07, 0x07, 0x14, 0x15, 0x07, 0x1A
.byte 0x20, 0xFF, 0x83, 0x84, 0x85, 0xA0, 0x07, 0x86
.byte 0x87, 0xA4, 0x9B, 0x2E, 0x3C, 0x28, 0x2B, 0x7C
.byte 0x26, 0x82, 0x88, 0x89, 0x8A, 0xA1, 0x8C, 0x07
.byte 0x8D, 0xE1, 0x21, 0x24, 0x2A, 0x29, 0x3B, 0xAA
.byte 0x2D, 0x2F, 0x07, 0x8E, 0x07, 0x07, 0x07, 0x8F
.byte 0x80, 0xA5, 0x07, 0x2C, 0x25, 0x5F, 0x3E, 0x3F
.byte 0x07, 0x90, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07
.byte 0x70, 0x60, 0x3A, 0x23, 0x40, 0x27, 0x3D, 0x22
.byte 0x07, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67
.byte 0x68, 0x69, 0xAE, 0xAF, 0x07, 0x07, 0x07, 0xF1
.byte 0xF8, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70
.byte 0x71, 0x72, 0xA6, 0xA7, 0x91, 0x07, 0x92, 0x07
.byte 0xE6, 0x7E, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78
.byte 0x79, 0x7A, 0xAD, 0xAB, 0x07, 0x07, 0x07, 0x07
.byte 0x5E, 0x9C, 0x9D, 0xFA, 0x07, 0x07, 0x07, 0xAC
.byte 0xAB, 0x07, 0x5B, 0x5D, 0x07, 0x07, 0x07, 0x07
.byte 0x7B, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47
.byte 0x48, 0x49, 0x07, 0x93, 0x94, 0x95, 0xA2, 0x07
.byte 0x7D, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50
.byte 0x51, 0x52, 0x07, 0x96, 0x81, 0x97, 0xA3, 0x98
.byte 0x5C, 0xF6, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58
.byte 0x59, 0x5A, 0xFD, 0x07, 0x99, 0x07, 0x07, 0x07
.byte 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37
.byte 0x38, 0x39, 0x07, 0x07, 0x9A, 0x07, 0x07, 0x07
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