469 lines
12 KiB
ArmAsm
469 lines
12 KiB
ArmAsm
/*
|
|
* arch/s390/kernel/head.S
|
|
*
|
|
* Copyright (C) IBM Corp. 1999,2006
|
|
*
|
|
* Author(s): Hartmut Penner <hp@de.ibm.com>
|
|
* Martin Schwidefsky <schwidefsky@de.ibm.com>
|
|
* Rob van der Heij <rvdhei@iae.nl>
|
|
* Heiko Carstens <heiko.carstens@de.ibm.com>
|
|
*
|
|
* There are 5 different IPL methods
|
|
* 1) load the image directly into ram at address 0 and do an PSW restart
|
|
* 2) linload will load the image from address 0x10000 to memory 0x10000
|
|
* and start the code thru LPSW 0x0008000080010000 (VM only, deprecated)
|
|
* 3) generate the tape ipl header, store the generated image on a tape
|
|
* and ipl from it
|
|
* In case of SL tape you need to IPL 5 times to get past VOL1 etc
|
|
* 4) generate the vm reader ipl header, move the generated image to the
|
|
* VM reader (use option NOH!) and do a ipl from reader (VM only)
|
|
* 5) direct call of start by the SALIPL loader
|
|
* We use the cpuid to distinguish between VM and native ipl
|
|
* params for kernel are pushed to 0x10400 (see setup.h)
|
|
*
|
|
*/
|
|
|
|
#include <asm/setup.h>
|
|
#include <asm/lowcore.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/thread_info.h>
|
|
#include <asm/page.h>
|
|
|
|
#ifdef CONFIG_64BIT
|
|
#define ARCH_OFFSET 4
|
|
#else
|
|
#define ARCH_OFFSET 0
|
|
#endif
|
|
|
|
.section ".text.head","ax"
|
|
#ifndef CONFIG_IPL
|
|
.org 0
|
|
.long 0x00080000,0x80000000+startup # Just a restart PSW
|
|
#else
|
|
#ifdef CONFIG_IPL_TAPE
|
|
#define IPL_BS 1024
|
|
.org 0
|
|
.long 0x00080000,0x80000000+iplstart # The first 24 bytes are loaded
|
|
.long 0x27000000,0x60000001 # by ipl to addresses 0-23.
|
|
.long 0x02000000,0x20000000+IPL_BS # (a PSW and two CCWs).
|
|
.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
|
|
.long 0x00080000,0x80000000+.Lioint # io new psw
|
|
|
|
.org 0x100
|
|
#
|
|
# subroutine for loading from tape
|
|
# Paramters:
|
|
# R1 = device number
|
|
# R2 = load address
|
|
.Lloader:
|
|
st %r14,.Lldret
|
|
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
|
|
.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
|
|
#endif /* CONFIG_IPL_TAPE */
|
|
|
|
#ifdef CONFIG_IPL_VM
|
|
#define IPL_BS 0x730
|
|
.org 0
|
|
.long 0x00080000,0x80000000+iplstart # The first 24 bytes are loaded
|
|
.long 0x02000018,0x60000050 # by ipl to addresses 0-23.
|
|
.long 0x02000068,0x60000050 # (a PSW and two CCWs).
|
|
.fill 80-24,1,0x40 # bytes 24-79 are discarded !!
|
|
.long 0x020000f0,0x60000050 # The next 160 byte are loaded
|
|
.long 0x02000140,0x60000050 # to addresses 0x18-0xb7
|
|
.long 0x02000190,0x60000050 # They form the continuation
|
|
.long 0x020001e0,0x60000050 # of the CCW program started
|
|
.long 0x02000230,0x60000050 # by ipl and load the range
|
|
.long 0x02000280,0x60000050 # 0x0f0-0x730 from the image
|
|
.long 0x020002d0,0x60000050 # to the range 0x0f0-0x730
|
|
.long 0x02000320,0x60000050 # in memory. At the end of
|
|
.long 0x02000370,0x60000050 # the channel program the PSW
|
|
.long 0x020003c0,0x60000050 # at location 0 is loaded.
|
|
.long 0x02000410,0x60000050 # Initial processing starts
|
|
.long 0x02000460,0x60000050 # at 0xf0 = iplstart.
|
|
.long 0x020004b0,0x60000050
|
|
.long 0x02000500,0x60000050
|
|
.long 0x02000550,0x60000050
|
|
.long 0x020005a0,0x60000050
|
|
.long 0x020005f0,0x60000050
|
|
.long 0x02000640,0x60000050
|
|
.long 0x02000690,0x60000050
|
|
.long 0x020006e0,0x20000050
|
|
|
|
.org 0xf0
|
|
#
|
|
# subroutine for loading cards from the reader
|
|
#
|
|
.Lloader:
|
|
la %r3,.Lorb # r2 = address of orb into r2
|
|
la %r5,.Lirb # r4 = address of irb
|
|
la %r6,.Lccws
|
|
la %r7,20
|
|
.Linit:
|
|
st %r2,4(%r6) # initialize CCW data addresses
|
|
la %r2,0x50(%r2)
|
|
la %r6,8(%r6)
|
|
bct 7,.Linit
|
|
|
|
lctl %c6,%c6,.Lcr6 # set IO subclass mask
|
|
slr %r2,%r2
|
|
.Lldlp:
|
|
ssch 0(%r3) # load chunk of 1600 bytes
|
|
bnz .Llderr
|
|
.Lwait4irq:
|
|
mvc 0x78(8),.Lnewpsw # set up IO interrupt psw
|
|
lpsw .Lwaitpsw
|
|
.Lioint:
|
|
c %r1,0xb8 # compare subchannel number
|
|
bne .Lwait4irq
|
|
tsch 0(%r5)
|
|
|
|
slr %r0,%r0
|
|
ic %r0,8(%r5) # get device status
|
|
chi %r0,8 # channel end ?
|
|
be .Lcont
|
|
chi %r0,12 # channel end + device end ?
|
|
be .Lcont
|
|
|
|
l %r0,4(%r5)
|
|
s %r0,8(%r3) # r0/8 = number of ccws executed
|
|
mhi %r0,10 # *10 = number of bytes in ccws
|
|
lh %r3,10(%r5) # get residual count
|
|
sr %r0,%r3 # #ccws*80-residual=#bytes read
|
|
ar %r2,%r0
|
|
|
|
br %r14 # r2 contains the total size
|
|
|
|
.Lcont:
|
|
ahi %r2,0x640 # add 0x640 to total size
|
|
la %r6,.Lccws
|
|
la %r7,20
|
|
.Lincr:
|
|
l %r0,4(%r6) # update CCW data addresses
|
|
ahi %r0,0x640
|
|
st %r0,4(%r6)
|
|
ahi %r6,8
|
|
bct 7,.Lincr
|
|
|
|
b .Lldlp
|
|
.Llderr:
|
|
lpsw .Lcrash
|
|
|
|
.align 8
|
|
.Lorb: .long 0x00000000,0x0080ff00,.Lccws
|
|
.Lirb: .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
|
.Lcr6: .long 0xff000000
|
|
.Lloadp:.long 0,0
|
|
.align 8
|
|
.Lcrash:.long 0x000a0000,0x00000000
|
|
.Lnewpsw:
|
|
.long 0x00080000,0x80000000+.Lioint
|
|
.Lwaitpsw:
|
|
.long 0x020a0000,0x80000000+.Lioint
|
|
|
|
.align 8
|
|
.Lccws: .rept 19
|
|
.long 0x02600050,0x00000000
|
|
.endr
|
|
.long 0x02200050,0x00000000
|
|
#endif /* CONFIG_IPL_VM */
|
|
|
|
iplstart:
|
|
lh %r1,0xb8 # test if subchannel number
|
|
bct %r1,.Lnoload # is valid
|
|
l %r1,0xb8 # load ipl subchannel number
|
|
la %r2,IPL_BS # load start address
|
|
bas %r14,.Lloader # load rest of ipl image
|
|
l %r12,.Lparm # pointer to parameter area
|
|
st %r1,IPL_DEVICE+ARCH_OFFSET-PARMAREA(%r12) # save ipl device number
|
|
|
|
#
|
|
# load parameter file from ipl device
|
|
#
|
|
.Lagain1:
|
|
l %r2,.Linitrd # ramdisk loc. is temp
|
|
bas %r14,.Lloader # load parameter file
|
|
ltr %r2,%r2 # got anything ?
|
|
bz .Lnopf
|
|
chi %r2,895
|
|
bnh .Lnotrunc
|
|
la %r2,895
|
|
.Lnotrunc:
|
|
l %r4,.Linitrd
|
|
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
|
|
la %r5,0(%r4,%r2)
|
|
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:
|
|
l %r3,.Lcvtab
|
|
tr 0(256,%r4),0(%r3) # convert parameters to ascii
|
|
tr 256(256,%r4),0(%r3)
|
|
tr 512(256,%r4),0(%r3)
|
|
tr 768(122,%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(122,%r3),768(%r4)
|
|
slr %r0,%r0
|
|
b .Lcntlp
|
|
.Ldelspc:
|
|
ic %r0,0(%r2,%r3)
|
|
chi %r0,0x20 # is it a space ?
|
|
be .Lcntlp
|
|
ahi %r2,1
|
|
b .Leolp
|
|
.Lcntlp:
|
|
brct %r2,.Ldelspc
|
|
.Leolp:
|
|
slr %r0,%r0
|
|
stc %r0,0(%r2,%r3) # terminate buffer
|
|
.Lnopf:
|
|
|
|
#
|
|
# load ramdisk from ipl device
|
|
#
|
|
.Lagain2:
|
|
l %r2,.Linitrd # addr of ramdisk
|
|
st %r2,INITRD_START+ARCH_OFFSET-PARMAREA(%r12)
|
|
bas %r14,.Lloader # load ramdisk
|
|
st %r2,INITRD_SIZE+ARCH_OFFSET-PARMAREA(%r12) # store size of rd
|
|
ltr %r2,%r2
|
|
bnz .Lrdcont
|
|
st %r2,INITRD_START+ARCH_OFFSET-PARMAREA(%r12) # no ramdisk found
|
|
.Lrdcont:
|
|
l %r2,.Linitrd
|
|
|
|
clc 0(3,%r2),.L_hdr # skip HDRx and EOFx
|
|
bz .Lagain2
|
|
clc 0(3,%r2),.L_eof
|
|
bz .Lagain2
|
|
|
|
#ifdef CONFIG_IPL_VM
|
|
#
|
|
# reset files in VM reader
|
|
#
|
|
stidp __LC_CPUID # store cpuid
|
|
tm __LC_CPUID,0xff # running VM ?
|
|
bno .Lnoreset
|
|
la %r2,.Lreset
|
|
lhi %r3,26
|
|
diag %r2,%r3,8
|
|
la %r5,.Lirb
|
|
stsch 0(%r5) # check if irq is pending
|
|
tm 30(%r5),0x0f # by verifying if any of the
|
|
bnz .Lwaitforirq # activity or status control
|
|
tm 31(%r5),0xff # bits is set in the schib
|
|
bz .Lnoreset
|
|
.Lwaitforirq:
|
|
mvc 0x78(8),.Lrdrnewpsw # set up IO interrupt psw
|
|
.Lwaitrdrirq:
|
|
lpsw .Lrdrwaitpsw
|
|
.Lrdrint:
|
|
c %r1,0xb8 # compare subchannel number
|
|
bne .Lwaitrdrirq
|
|
la %r5,.Lirb
|
|
tsch 0(%r5)
|
|
.Lnoreset:
|
|
b .Lnoload
|
|
|
|
.align 8
|
|
.Lrdrnewpsw:
|
|
.long 0x00080000,0x80000000+.Lrdrint
|
|
.Lrdrwaitpsw:
|
|
.long 0x020a0000,0x80000000+.Lrdrint
|
|
#endif
|
|
|
|
#
|
|
# everything loaded, go for it
|
|
#
|
|
.Lnoload:
|
|
l %r1,.Lstartup
|
|
br %r1
|
|
|
|
.Linitrd:.long _end + 0x400000 # default address of initrd
|
|
.Lparm: .long PARMAREA
|
|
.Lstartup: .long startup
|
|
.Lcvtab:.long _ebcasc # ebcdic to ascii table
|
|
.Lreset:.byte 0xc3,0xc8,0xc1,0xd5,0xc7,0xc5,0x40,0xd9,0xc4,0xd9,0x40
|
|
.byte 0xc1,0xd3,0xd3,0x40,0xd2,0xc5,0xc5,0xd7,0x40,0xd5,0xd6
|
|
.byte 0xc8,0xd6,0xd3,0xc4 # "change rdr all keep nohold"
|
|
.L_eof: .long 0xc5d6c600 /* C'EOF' */
|
|
.L_hdr: .long 0xc8c4d900 /* C'HDR' */
|
|
|
|
#endif /* CONFIG_IPL */
|
|
|
|
#
|
|
# SALIPL loader support. Based on a patch by Rob van der Heij.
|
|
# This entry point is called directly from the SALIPL loader and
|
|
# doesn't need a builtin ipl record.
|
|
#
|
|
.org 0x800
|
|
.globl start
|
|
start:
|
|
stm %r0,%r15,0x07b0 # store registers
|
|
basr %r12,%r0
|
|
.base:
|
|
l %r11,.parm
|
|
l %r8,.cmd # pointer to command buffer
|
|
|
|
ltr %r9,%r9 # do we have SALIPL parameters?
|
|
bp .sk8x8
|
|
|
|
mvc 0(64,%r8),0x00b0 # copy saved registers
|
|
xc 64(240-64,%r8),0(%r8) # remainder of buffer
|
|
tr 0(64,%r8),.lowcase
|
|
b .gotr
|
|
.sk8x8:
|
|
mvc 0(240,%r8),0(%r9) # copy iplparms into buffer
|
|
.gotr:
|
|
l %r10,.tbl # EBCDIC to ASCII table
|
|
tr 0(240,%r8),0(%r10)
|
|
slr %r0,%r0
|
|
st %r0,INITRD_SIZE+ARCH_OFFSET-PARMAREA(%r11)
|
|
st %r0,INITRD_START+ARCH_OFFSET-PARMAREA(%r11)
|
|
j startup # continue with startup
|
|
.tbl: .long _ebcasc # translate table
|
|
.cmd: .long COMMAND_LINE # address of command line buffer
|
|
.parm: .long PARMAREA
|
|
.lowcase:
|
|
.byte 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07
|
|
.byte 0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f
|
|
.byte 0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17
|
|
.byte 0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f
|
|
.byte 0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27
|
|
.byte 0x28,0x29,0x2a,0x2b,0x2c,0x2d,0x2e,0x2f
|
|
.byte 0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37
|
|
.byte 0x38,0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f
|
|
.byte 0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47
|
|
.byte 0x48,0x49,0x4a,0x4b,0x4c,0x4d,0x4e,0x4f
|
|
.byte 0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57
|
|
.byte 0x58,0x59,0x5a,0x5b,0x5c,0x5d,0x5e,0x5f
|
|
.byte 0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67
|
|
.byte 0x68,0x69,0x6a,0x6b,0x6c,0x6d,0x6e,0x6f
|
|
.byte 0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77
|
|
.byte 0x78,0x79,0x7a,0x7b,0x7c,0x7d,0x7e,0x7f
|
|
|
|
.byte 0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87
|
|
.byte 0x88,0x89,0x8a,0x8b,0x8c,0x8d,0x8e,0x8f
|
|
.byte 0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97
|
|
.byte 0x98,0x99,0x9a,0x9b,0x9c,0x9d,0x9e,0x9f
|
|
.byte 0xa0,0xa1,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7
|
|
.byte 0xa8,0xa9,0xaa,0xab,0xac,0xad,0xae,0xaf
|
|
.byte 0xb0,0xb1,0xb2,0xb3,0xb4,0xb5,0xb6,0xb7
|
|
.byte 0xb8,0xb9,0xba,0xbb,0xbc,0xbd,0xbe,0xbf
|
|
.byte 0xc0,0x81,0x82,0x83,0x84,0x85,0x86,0x87 # .abcdefg
|
|
.byte 0x88,0x89,0xca,0xcb,0xcc,0xcd,0xce,0xcf # hi
|
|
.byte 0xd0,0x91,0x92,0x93,0x94,0x95,0x96,0x97 # .jklmnop
|
|
.byte 0x98,0x99,0xda,0xdb,0xdc,0xdd,0xde,0xdf # qr
|
|
.byte 0xe0,0xe1,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7 # ..stuvwx
|
|
.byte 0xa8,0xa9,0xea,0xeb,0xec,0xed,0xee,0xef # yz
|
|
.byte 0xf0,0xf1,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7
|
|
.byte 0xf8,0xf9,0xfa,0xfb,0xfc,0xfd,0xfe,0xff
|
|
|
|
#ifdef CONFIG_64BIT
|
|
#include "head64.S"
|
|
#else
|
|
#include "head31.S"
|
|
#endif
|