2005-04-16 15:20:36 -07:00
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/*
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* arch/s390/kernel/head.S
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*
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* S390 version
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* Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author(s): Hartmut Penner (hp@de.ibm.com),
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* Martin Schwidefsky (schwidefsky@de.ibm.com),
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* Rob van der Heij (rvdhei@iae.nl)
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*
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* There are 5 different IPL methods
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* 1) load the image directly into ram at address 0 and do an PSW restart
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* 2) linload will load the image from address 0x10000 to memory 0x10000
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* and start the code thru LPSW 0x0008000080010000 (VM only, deprecated)
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* 3) generate the tape ipl header, store the generated image on a tape
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* and ipl from it
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* In case of SL tape you need to IPL 5 times to get past VOL1 etc
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* 4) generate the vm reader ipl header, move the generated image to the
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* VM reader (use option NOH!) and do a ipl from reader (VM only)
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* 5) direct call of start by the SALIPL loader
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* We use the cpuid to distinguish between VM and native ipl
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* params for kernel are pushed to 0x10400 (see setup.h)
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Changes:
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Okt 25 2000 <rvdheij@iae.nl>
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added code to skip HDR and EOF to allow SL tape IPL (5 retries)
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changed first CCW from rewind to backspace block
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*/
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#include <linux/config.h>
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#include <asm/setup.h>
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#include <asm/lowcore.h>
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#include <asm/offsets.h>
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#include <asm/thread_info.h>
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#include <asm/page.h>
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#ifndef CONFIG_IPL
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.org 0
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.long 0x00080000,0x80000000+startup # Just a restart PSW
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#else
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#ifdef CONFIG_IPL_TAPE
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#define IPL_BS 1024
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.org 0
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.long 0x00080000,0x80000000+iplstart # The first 24 bytes are loaded
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.long 0x27000000,0x60000001 # by ipl to addresses 0-23.
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.long 0x02000000,0x20000000+IPL_BS # (a PSW and two CCWs).
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.long 0x00000000,0x00000000 # external old psw
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.long 0x00000000,0x00000000 # svc old psw
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.long 0x00000000,0x00000000 # program check old psw
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.long 0x00000000,0x00000000 # machine check old psw
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.long 0x00000000,0x00000000 # io old psw
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.long 0x00000000,0x00000000
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.long 0x00000000,0x00000000
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.long 0x00000000,0x00000000
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.long 0x000a0000,0x00000058 # external new psw
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.long 0x000a0000,0x00000060 # svc new psw
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.long 0x000a0000,0x00000068 # program check new psw
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.long 0x000a0000,0x00000070 # machine check new psw
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.long 0x00080000,0x80000000+.Lioint # io new psw
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.org 0x100
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#
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# subroutine for loading from tape
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# Paramters:
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# R1 = device number
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# R2 = load address
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.Lloader:
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st %r14,.Lldret
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la %r3,.Lorbread # r3 = address of orb
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la %r5,.Lirb # r5 = address of irb
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st %r2,.Lccwread+4 # initialize CCW data addresses
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lctl %c6,%c6,.Lcr6
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slr %r2,%r2
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.Lldlp:
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la %r6,3 # 3 retries
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.Lssch:
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ssch 0(%r3) # load chunk of IPL_BS bytes
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bnz .Llderr
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.Lw4end:
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bas %r14,.Lwait4io
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tm 8(%r5),0x82 # do we have a problem ?
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bnz .Lrecov
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slr %r7,%r7
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icm %r7,3,10(%r5) # get residual count
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lcr %r7,%r7
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la %r7,IPL_BS(%r7) # IPL_BS-residual=#bytes read
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ar %r2,%r7 # add to total size
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tm 8(%r5),0x01 # found a tape mark ?
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bnz .Ldone
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l %r0,.Lccwread+4 # update CCW data addresses
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ar %r0,%r7
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st %r0,.Lccwread+4
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b .Lldlp
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.Ldone:
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l %r14,.Lldret
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br %r14 # r2 contains the total size
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.Lrecov:
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bas %r14,.Lsense # do the sensing
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bct %r6,.Lssch # dec. retry count & branch
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b .Llderr
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#
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# Sense subroutine
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#
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.Lsense:
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st %r14,.Lsnsret
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la %r7,.Lorbsense
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ssch 0(%r7) # start sense command
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bnz .Llderr
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bas %r14,.Lwait4io
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l %r14,.Lsnsret
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tm 8(%r5),0x82 # do we have a problem ?
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bnz .Llderr
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br %r14
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#
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# Wait for interrupt subroutine
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#
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.Lwait4io:
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lpsw .Lwaitpsw
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.Lioint:
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c %r1,0xb8 # compare subchannel number
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bne .Lwait4io
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tsch 0(%r5)
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slr %r0,%r0
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tm 8(%r5),0x82 # do we have a problem ?
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bnz .Lwtexit
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tm 8(%r5),0x04 # got device end ?
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bz .Lwait4io
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.Lwtexit:
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br %r14
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.Llderr:
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lpsw .Lcrash
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.align 8
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.Lorbread:
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.long 0x00000000,0x0080ff00,.Lccwread
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.align 8
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.Lorbsense:
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.long 0x00000000,0x0080ff00,.Lccwsense
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.align 8
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.Lccwread:
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.long 0x02200000+IPL_BS,0x00000000
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.Lccwsense:
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.long 0x04200001,0x00000000
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.Lwaitpsw:
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.long 0x020a0000,0x80000000+.Lioint
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.Lirb: .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
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.Lcr6: .long 0xff000000
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.align 8
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.Lcrash:.long 0x000a0000,0x00000000
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.Lldret:.long 0
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.Lsnsret: .long 0
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#endif /* CONFIG_IPL_TAPE */
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#ifdef CONFIG_IPL_VM
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#define IPL_BS 0x730
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.org 0
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.long 0x00080000,0x80000000+iplstart # The first 24 bytes are loaded
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.long 0x02000018,0x60000050 # by ipl to addresses 0-23.
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.long 0x02000068,0x60000050 # (a PSW and two CCWs).
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.fill 80-24,1,0x40 # bytes 24-79 are discarded !!
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.long 0x020000f0,0x60000050 # The next 160 byte are loaded
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.long 0x02000140,0x60000050 # to addresses 0x18-0xb7
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.long 0x02000190,0x60000050 # They form the continuation
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.long 0x020001e0,0x60000050 # of the CCW program started
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.long 0x02000230,0x60000050 # by ipl and load the range
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.long 0x02000280,0x60000050 # 0x0f0-0x730 from the image
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.long 0x020002d0,0x60000050 # to the range 0x0f0-0x730
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.long 0x02000320,0x60000050 # in memory. At the end of
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.long 0x02000370,0x60000050 # the channel program the PSW
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.long 0x020003c0,0x60000050 # at location 0 is loaded.
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.long 0x02000410,0x60000050 # Initial processing starts
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.long 0x02000460,0x60000050 # at 0xf0 = iplstart.
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.long 0x020004b0,0x60000050
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.long 0x02000500,0x60000050
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.long 0x02000550,0x60000050
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.long 0x020005a0,0x60000050
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.long 0x020005f0,0x60000050
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.long 0x02000640,0x60000050
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.long 0x02000690,0x60000050
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.long 0x020006e0,0x20000050
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.org 0xf0
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#
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# subroutine for loading cards from the reader
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#
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.Lloader:
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la %r3,.Lorb # r2 = address of orb into r2
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la %r5,.Lirb # r4 = address of irb
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la %r6,.Lccws
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la %r7,20
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.Linit:
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st %r2,4(%r6) # initialize CCW data addresses
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la %r2,0x50(%r2)
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la %r6,8(%r6)
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bct 7,.Linit
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lctl %c6,%c6,.Lcr6 # set IO subclass mask
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slr %r2,%r2
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.Lldlp:
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ssch 0(%r3) # load chunk of 1600 bytes
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bnz .Llderr
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.Lwait4irq:
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mvc __LC_IO_NEW_PSW(8),.Lnewpsw # set up IO interrupt psw
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lpsw .Lwaitpsw
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.Lioint:
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c %r1,0xb8 # compare subchannel number
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bne .Lwait4irq
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tsch 0(%r5)
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slr %r0,%r0
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ic %r0,8(%r5) # get device status
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chi %r0,8 # channel end ?
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be .Lcont
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chi %r0,12 # channel end + device end ?
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be .Lcont
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l %r0,4(%r5)
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s %r0,8(%r3) # r0/8 = number of ccws executed
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mhi %r0,10 # *10 = number of bytes in ccws
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lh %r3,10(%r5) # get residual count
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sr %r0,%r3 # #ccws*80-residual=#bytes read
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ar %r2,%r0
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br %r14 # r2 contains the total size
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.Lcont:
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ahi %r2,0x640 # add 0x640 to total size
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la %r6,.Lccws
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la %r7,20
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.Lincr:
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l %r0,4(%r6) # update CCW data addresses
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ahi %r0,0x640
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st %r0,4(%r6)
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ahi %r6,8
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bct 7,.Lincr
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b .Lldlp
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.Llderr:
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lpsw .Lcrash
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.align 8
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.Lorb: .long 0x00000000,0x0080ff00,.Lccws
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.Lirb: .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
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.Lcr6: .long 0xff000000
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.Lloadp:.long 0,0
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.align 8
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.Lcrash:.long 0x000a0000,0x00000000
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.Lnewpsw:
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.long 0x00080000,0x80000000+.Lioint
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.Lwaitpsw:
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.long 0x020a0000,0x80000000+.Lioint
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.align 8
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.Lccws: .rept 19
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.long 0x02600050,0x00000000
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.endr
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.long 0x02200050,0x00000000
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#endif /* CONFIG_IPL_VM */
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iplstart:
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lh %r1,0xb8 # test if subchannel number
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bct %r1,.Lnoload # is valid
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l %r1,0xb8 # load ipl subchannel number
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la %r2,IPL_BS # load start address
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bas %r14,.Lloader # load rest of ipl image
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l %r12,.Lparm # pointer to parameter area
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st %r1,IPL_DEVICE-PARMAREA(%r12) # store ipl device number
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#
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# load parameter file from ipl device
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#
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.Lagain1:
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l %r2,INITRD_START-PARMAREA(%r12) # use ramdisk location as temp
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bas %r14,.Lloader # load parameter file
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ltr %r2,%r2 # got anything ?
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bz .Lnopf
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chi %r2,895
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bnh .Lnotrunc
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la %r2,895
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.Lnotrunc:
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l %r4,INITRD_START-PARMAREA(%r12)
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clc 0(3,%r4),.L_hdr # if it is HDRx
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bz .Lagain1 # skip dataset header
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clc 0(3,%r4),.L_eof # if it is EOFx
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bz .Lagain1 # skip dateset trailer
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la %r5,0(%r4,%r2)
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lr %r3,%r2
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.Lidebc:
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tm 0(%r5),0x80 # high order bit set ?
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bo .Ldocv # yes -> convert from EBCDIC
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ahi %r5,-1
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bct %r3,.Lidebc
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b .Lnocv
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.Ldocv:
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l %r3,.Lcvtab
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tr 0(256,%r4),0(%r3) # convert parameters to ascii
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tr 256(256,%r4),0(%r3)
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tr 512(256,%r4),0(%r3)
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tr 768(122,%r4),0(%r3)
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|
.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,INITRD_START-PARMAREA(%r12) # load adr. of ramdisk
|
|
|
|
|
bas %r14,.Lloader # load ramdisk
|
|
|
|
|
st %r2,INITRD_SIZE-PARMAREA(%r12) # store size of ramdisk
|
|
|
|
|
ltr %r2,%r2
|
|
|
|
|
bnz .Lrdcont
|
|
|
|
|
st %r2,INITRD_START-PARMAREA(%r12) # no ramdisk found, null it
|
|
|
|
|
.Lrdcont:
|
|
|
|
|
l %r2,INITRD_START-PARMAREA(%r12)
|
|
|
|
|
|
|
|
|
|
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
|
2005-06-21 17:16:31 -07:00
|
|
|
diag %r2,%r3,8
|
2005-07-29 14:03:36 -07:00
|
|
|
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:
|
2005-06-21 17:16:31 -07:00
|
|
|
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)
|
2005-04-16 15:20:36 -07:00
|
|
|
.Lnoreset:
|
2005-06-21 17:16:31 -07:00
|
|
|
b .Lnoload
|
|
|
|
|
|
|
|
|
|
.align 8
|
|
|
|
|
.Lrdrnewpsw:
|
|
|
|
|
.long 0x00080000,0x80000000+.Lrdrint
|
|
|
|
|
.Lrdrwaitpsw:
|
|
|
|
|
.long 0x020a0000,0x80000000+.Lrdrint
|
2005-04-16 15:20:36 -07:00
|
|
|
#endif
|
2005-06-21 17:16:31 -07:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
#
|
|
|
|
|
# everything loaded, go for it
|
|
|
|
|
#
|
|
|
|
|
.Lnoload:
|
|
|
|
|
l %r1,.Lstartup
|
|
|
|
|
br %r1
|
|
|
|
|
|
|
|
|
|
.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)
|
|
|
|
|
stidp __LC_CPUID # Are we running on VM maybe
|
|
|
|
|
cli __LC_CPUID,0xff
|
|
|
|
|
bnz .test
|
|
|
|
|
.long 0x83300060 # diag 3,0,x'0060' - storage size
|
|
|
|
|
b .done
|
|
|
|
|
.test:
|
|
|
|
|
mvc 0x68(8),.pgmnw # set up pgm check handler
|
|
|
|
|
l %r2,.fourmeg
|
|
|
|
|
lr %r3,%r2
|
|
|
|
|
bctr %r3,%r0 # 4M-1
|
|
|
|
|
.loop: iske %r0,%r3
|
|
|
|
|
ar %r3,%r2
|
|
|
|
|
.pgmx:
|
|
|
|
|
sr %r3,%r2
|
|
|
|
|
la %r3,1(%r3)
|
|
|
|
|
.done:
|
|
|
|
|
l %r1,.memsize
|
|
|
|
|
st %r3,0(%r1)
|
|
|
|
|
slr %r0,%r0
|
|
|
|
|
st %r0,INITRD_SIZE-PARMAREA(%r11)
|
|
|
|
|
st %r0,INITRD_START-PARMAREA(%r11)
|
|
|
|
|
j startup # continue with startup
|
|
|
|
|
.tbl: .long _ebcasc # translate table
|
|
|
|
|
.cmd: .long COMMAND_LINE # address of command line buffer
|
|
|
|
|
.parm: .long PARMAREA
|
|
|
|
|
.memsize: .long memory_size
|
|
|
|
|
.fourmeg: .long 0x00400000 # 4M
|
|
|
|
|
.pgmnw: .long 0x00080000,.pgmx
|
|
|
|
|
.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
|
|
|
|
|
|
|
|
|
|
#
|
|
|
|
|
# startup-code at 0x10000, running in real mode
|
|
|
|
|
# this is called either by the ipl loader or directly by PSW restart
|
|
|
|
|
# or linload or SALIPL
|
|
|
|
|
#
|
|
|
|
|
.org 0x10000
|
|
|
|
|
startup:basr %r13,0 # get base
|
|
|
|
|
.LPG1: lctl %c0,%c15,.Lctl-.LPG1(%r13) # load control registers
|
|
|
|
|
la %r12,_pstart-.LPG1(%r13) # pointer to parameter area
|
|
|
|
|
# move IPL device to lowcore
|
|
|
|
|
mvc __LC_IPLDEV(4),IPL_DEVICE-PARMAREA(%r12)
|
|
|
|
|
|
|
|
|
|
#
|
|
|
|
|
# clear bss memory
|
|
|
|
|
#
|
|
|
|
|
l %r2,.Lbss_bgn-.LPG1(%r13) # start of bss
|
|
|
|
|
l %r3,.Lbss_end-.LPG1(%r13) # end of bss
|
|
|
|
|
sr %r3,%r2 # length of bss
|
|
|
|
|
sr %r4,%r4 #
|
|
|
|
|
sr %r5,%r5 # set src,length and pad to zero
|
|
|
|
|
sr %r0,%r0 #
|
|
|
|
|
mvcle %r2,%r4,0 # clear mem
|
|
|
|
|
jo .-4 # branch back, if not finish
|
|
|
|
|
|
|
|
|
|
l %r2,.Lrcp-.LPG1(%r13) # Read SCP forced command word
|
|
|
|
|
.Lservicecall:
|
|
|
|
|
stosm .Lpmask-.LPG1(%r13),0x01 # authorize ext interrupts
|
|
|
|
|
|
|
|
|
|
stctl %r0, %r0,.Lcr-.LPG1(%r13) # get cr0
|
|
|
|
|
la %r1,0x200 # set bit 22
|
|
|
|
|
o %r1,.Lcr-.LPG1(%r13) # or old cr0 with r1
|
|
|
|
|
st %r1,.Lcr-.LPG1(%r13)
|
|
|
|
|
lctl %r0, %r0,.Lcr-.LPG1(%r13) # load modified cr0
|
|
|
|
|
|
|
|
|
|
mvc __LC_EXT_NEW_PSW(8),.Lpcext-.LPG1(%r13) # set postcall psw
|
|
|
|
|
la %r1, .Lsclph-.LPG1(%r13)
|
|
|
|
|
a %r1,__LC_EXT_NEW_PSW+4 # set handler
|
|
|
|
|
st %r1,__LC_EXT_NEW_PSW+4
|
|
|
|
|
|
|
|
|
|
la %r4,_pstart-.LPG1(%r13) # %r4 is our index for sccb stuff
|
|
|
|
|
la %r1, .Lsccb-PARMAREA(%r4) # our sccb
|
|
|
|
|
.insn rre,0xb2200000,%r2,%r1 # service call
|
|
|
|
|
ipm %r1
|
|
|
|
|
srl %r1,28 # get cc code
|
|
|
|
|
xr %r3, %r3
|
|
|
|
|
chi %r1,3
|
|
|
|
|
be .Lfchunk-.LPG1(%r13) # leave
|
|
|
|
|
chi %r1,2
|
|
|
|
|
be .Lservicecall-.LPG1(%r13)
|
|
|
|
|
lpsw .Lwaitsclp-.LPG1(%r13)
|
|
|
|
|
.Lsclph:
|
|
|
|
|
lh %r1,.Lsccbr-PARMAREA(%r4)
|
|
|
|
|
chi %r1,0x10 # 0x0010 is the sucess code
|
|
|
|
|
je .Lprocsccb # let's process the sccb
|
|
|
|
|
chi %r1,0x1f0
|
|
|
|
|
bne .Lfchunk-.LPG1(%r13) # unhandled error code
|
|
|
|
|
c %r2, .Lrcp-.LPG1(%r13) # Did we try Read SCP forced
|
|
|
|
|
bne .Lfchunk-.LPG1(%r13) # if no, give up
|
|
|
|
|
l %r2, .Lrcp2-.LPG1(%r13) # try with Read SCP
|
|
|
|
|
b .Lservicecall-.LPG1(%r13)
|
|
|
|
|
.Lprocsccb:
|
2005-06-21 17:16:30 -07:00
|
|
|
lhi %r1,0
|
|
|
|
|
icm %r1,3,.Lscpincr1-PARMAREA(%r4) # use this one if != 0
|
|
|
|
|
jnz .Lscnd
|
2005-07-27 11:45:05 -07:00
|
|
|
lhi %r1,0x800 # otherwise report 2GB
|
2005-04-16 15:20:36 -07:00
|
|
|
.Lscnd:
|
2005-07-27 11:45:05 -07:00
|
|
|
lhi %r3,0x800 # limit reported memory size to 2GB
|
|
|
|
|
cr %r1,%r3
|
|
|
|
|
jl .Lno2gb
|
|
|
|
|
lr %r1,%r3
|
|
|
|
|
.Lno2gb:
|
2005-04-16 15:20:36 -07:00
|
|
|
xr %r3,%r3 # same logic
|
|
|
|
|
ic %r3,.Lscpa1-PARMAREA(%r4)
|
|
|
|
|
chi %r3,0x00
|
|
|
|
|
jne .Lcompmem
|
|
|
|
|
l %r3,.Lscpa2-PARMAREA(%r13)
|
|
|
|
|
.Lcompmem:
|
|
|
|
|
mr %r2,%r1 # mem in MB on 128-bit
|
|
|
|
|
l %r1,.Lonemb-.LPG1(%r13)
|
|
|
|
|
mr %r2,%r1 # mem size in bytes in %r3
|
|
|
|
|
b .Lfchunk-.LPG1(%r13)
|
|
|
|
|
|
|
|
|
|
.Lpmask:
|
|
|
|
|
.byte 0
|
|
|
|
|
.align 8
|
|
|
|
|
.Lpcext:.long 0x00080000,0x80000000
|
|
|
|
|
.Lcr:
|
|
|
|
|
.long 0x00 # place holder for cr0
|
|
|
|
|
.Lwaitsclp:
|
|
|
|
|
.long 0x020A0000
|
|
|
|
|
.long .Lsclph
|
|
|
|
|
.Lrcp:
|
|
|
|
|
.int 0x00120001 # Read SCP forced code
|
|
|
|
|
.Lrcp2:
|
|
|
|
|
.int 0x00020001 # Read SCP code
|
|
|
|
|
.Lonemb:
|
|
|
|
|
.int 0x100000
|
|
|
|
|
.Lfchunk:
|
|
|
|
|
|
|
|
|
|
#
|
|
|
|
|
# find memory chunks.
|
|
|
|
|
#
|
|
|
|
|
lr %r9,%r3 # end of mem
|
|
|
|
|
mvc __LC_PGM_NEW_PSW(8),.Lpcmem-.LPG1(%r13)
|
|
|
|
|
la %r1,1 # test in increments of 128KB
|
|
|
|
|
sll %r1,17
|
|
|
|
|
l %r3,.Lmchunk-.LPG1(%r13) # get pointer to memory_chunk array
|
|
|
|
|
slr %r4,%r4 # set start of chunk to zero
|
|
|
|
|
slr %r5,%r5 # set end of chunk to zero
|
|
|
|
|
slr %r6,%r6 # set access code to zero
|
|
|
|
|
la %r10, MEMORY_CHUNKS # number of chunks
|
|
|
|
|
.Lloop:
|
|
|
|
|
tprot 0(%r5),0 # test protection of first byte
|
|
|
|
|
ipm %r7
|
|
|
|
|
srl %r7,28
|
|
|
|
|
clr %r6,%r7 # compare cc with last access code
|
|
|
|
|
be .Lsame-.LPG1(%r13)
|
|
|
|
|
b .Lchkmem-.LPG1(%r13)
|
|
|
|
|
.Lsame:
|
|
|
|
|
ar %r5,%r1 # add 128KB to end of chunk
|
|
|
|
|
bno .Lloop-.LPG1(%r13) # r1 < 0x80000000 -> loop
|
|
|
|
|
.Lchkmem: # > 2GB or tprot got a program check
|
|
|
|
|
clr %r4,%r5 # chunk size > 0?
|
|
|
|
|
be .Lchkloop-.LPG1(%r13)
|
|
|
|
|
st %r4,0(%r3) # store start address of chunk
|
|
|
|
|
lr %r0,%r5
|
|
|
|
|
slr %r0,%r4
|
|
|
|
|
st %r0,4(%r3) # store size of chunk
|
|
|
|
|
st %r6,8(%r3) # store type of chunk
|
|
|
|
|
la %r3,12(%r3)
|
|
|
|
|
l %r4,.Lmemsize-.LPG1(%r13) # address of variable memory_size
|
|
|
|
|
st %r5,0(%r4) # store last end to memory size
|
|
|
|
|
ahi %r10,-1 # update chunk number
|
|
|
|
|
.Lchkloop:
|
|
|
|
|
lr %r6,%r7 # set access code to last cc
|
|
|
|
|
# we got an exception or we're starting a new
|
|
|
|
|
# chunk , we must check if we should
|
|
|
|
|
# still try to find valid memory (if we detected
|
|
|
|
|
# the amount of available storage), and if we
|
|
|
|
|
# have chunks left
|
|
|
|
|
xr %r0,%r0
|
|
|
|
|
clr %r0,%r9 # did we detect memory?
|
|
|
|
|
je .Ldonemem # if not, leave
|
|
|
|
|
chi %r10,0 # do we have chunks left?
|
|
|
|
|
je .Ldonemem
|
|
|
|
|
alr %r5,%r1 # add 128KB to end of chunk
|
|
|
|
|
lr %r4,%r5 # potential new chunk
|
|
|
|
|
clr %r5,%r9 # should we go on?
|
|
|
|
|
jl .Lloop
|
|
|
|
|
.Ldonemem:
|
|
|
|
|
l %r12,.Lmflags-.LPG1(%r13) # get address of machine_flags
|
|
|
|
|
#
|
|
|
|
|
# find out if we are running under VM
|
|
|
|
|
#
|
|
|
|
|
stidp __LC_CPUID # store cpuid
|
|
|
|
|
tm __LC_CPUID,0xff # running under VM ?
|
|
|
|
|
bno .Lnovm-.LPG1(%r13)
|
|
|
|
|
oi 3(%r12),1 # set VM flag
|
|
|
|
|
.Lnovm:
|
|
|
|
|
lh %r0,__LC_CPUID+4 # get cpu version
|
|
|
|
|
chi %r0,0x7490 # running on a P/390 ?
|
|
|
|
|
bne .Lnop390-.LPG1(%r13)
|
|
|
|
|
oi 3(%r12),4 # set P/390 flag
|
|
|
|
|
.Lnop390:
|
|
|
|
|
|
|
|
|
|
#
|
|
|
|
|
# find out if we have an IEEE fpu
|
|
|
|
|
#
|
|
|
|
|
mvc __LC_PGM_NEW_PSW(8),.Lpcfpu-.LPG1(%r13)
|
|
|
|
|
efpc %r0,0 # test IEEE extract fpc instruction
|
|
|
|
|
oi 3(%r12),2 # set IEEE fpu flag
|
|
|
|
|
.Lchkfpu:
|
|
|
|
|
|
|
|
|
|
#
|
|
|
|
|
# find out if we have the CSP instruction
|
|
|
|
|
#
|
|
|
|
|
mvc __LC_PGM_NEW_PSW(8),.Lpccsp-.LPG1(%r13)
|
|
|
|
|
la %r0,0
|
|
|
|
|
lr %r1,%r0
|
|
|
|
|
la %r2,4
|
|
|
|
|
csp %r0,%r2 # Test CSP instruction
|
|
|
|
|
oi 3(%r12),8 # set CSP flag
|
|
|
|
|
.Lchkcsp:
|
|
|
|
|
|
|
|
|
|
#
|
|
|
|
|
# find out if we have the MVPG instruction
|
|
|
|
|
#
|
|
|
|
|
mvc __LC_PGM_NEW_PSW(8),.Lpcmvpg-.LPG1(%r13)
|
|
|
|
|
sr %r0,%r0
|
|
|
|
|
la %r1,0
|
|
|
|
|
la %r2,0
|
|
|
|
|
mvpg %r1,%r2 # Test CSP instruction
|
|
|
|
|
oi 3(%r12),16 # set MVPG flag
|
|
|
|
|
.Lchkmvpg:
|
|
|
|
|
|
|
|
|
|
#
|
|
|
|
|
# find out if we have the IDTE instruction
|
|
|
|
|
#
|
|
|
|
|
mvc __LC_PGM_NEW_PSW(8),.Lpcidte-.LPG1(%r13)
|
|
|
|
|
.long 0xb2b10000 # store facility list
|
|
|
|
|
tm 0xc8,0x08 # check bit for clearing-by-ASCE
|
|
|
|
|
bno .Lchkidte-.LPG1(%r13)
|
|
|
|
|
lhi %r1,2094
|
|
|
|
|
lhi %r2,0
|
|
|
|
|
.long 0xb98e2001
|
|
|
|
|
oi 3(%r12),0x80 # set IDTE flag
|
|
|
|
|
.Lchkidte:
|
|
|
|
|
|
|
|
|
|
lpsw .Lentry-.LPG1(13) # jump to _stext in primary-space,
|
|
|
|
|
# virtual and never return ...
|
|
|
|
|
.align 8
|
|
|
|
|
.Lentry:.long 0x00080000,0x80000000 + _stext
|
|
|
|
|
.Lctl: .long 0x04b50002 # cr0: various things
|
|
|
|
|
.long 0 # cr1: primary space segment table
|
|
|
|
|
.long .Lduct # cr2: dispatchable unit control table
|
|
|
|
|
.long 0 # cr3: instruction authorization
|
|
|
|
|
.long 0 # cr4: instruction authorization
|
|
|
|
|
.long 0xffffffff # cr5: primary-aste origin
|
|
|
|
|
.long 0 # cr6: I/O interrupts
|
|
|
|
|
.long 0 # cr7: secondary space segment table
|
|
|
|
|
.long 0 # cr8: access registers translation
|
|
|
|
|
.long 0 # cr9: tracing off
|
|
|
|
|
.long 0 # cr10: tracing off
|
|
|
|
|
.long 0 # cr11: tracing off
|
|
|
|
|
.long 0 # cr12: tracing off
|
|
|
|
|
.long 0 # cr13: home space segment table
|
|
|
|
|
.long 0xc0000000 # cr14: machine check handling off
|
|
|
|
|
.long 0 # cr15: linkage stack operations
|
|
|
|
|
.Lpcmem:.long 0x00080000,0x80000000 + .Lchkmem
|
|
|
|
|
.Lpcfpu:.long 0x00080000,0x80000000 + .Lchkfpu
|
|
|
|
|
.Lpccsp:.long 0x00080000,0x80000000 + .Lchkcsp
|
|
|
|
|
.Lpcmvpg:.long 0x00080000,0x80000000 + .Lchkmvpg
|
|
|
|
|
.Lpcidte:.long 0x00080000,0x80000000 + .Lchkidte
|
|
|
|
|
.Lmemsize:.long memory_size
|
|
|
|
|
.Lmchunk:.long memory_chunk
|
|
|
|
|
.Lmflags:.long machine_flags
|
|
|
|
|
.Lbss_bgn: .long __bss_start
|
|
|
|
|
.Lbss_end: .long _end
|
|
|
|
|
|
|
|
|
|
.org PARMAREA-64
|
|
|
|
|
.Lduct: .long 0,0,0,0,0,0,0,0
|
|
|
|
|
.long 0,0,0,0,0,0,0,0
|
|
|
|
|
|
|
|
|
|
#
|
|
|
|
|
# params at 10400 (setup.h)
|
|
|
|
|
#
|
|
|
|
|
.org PARMAREA
|
|
|
|
|
.global _pstart
|
|
|
|
|
_pstart:
|
|
|
|
|
.long 0,0 # IPL_DEVICE
|
|
|
|
|
.long 0,RAMDISK_ORIGIN # INITRD_START
|
|
|
|
|
.long 0,RAMDISK_SIZE # INITRD_SIZE
|
|
|
|
|
|
|
|
|
|
.org COMMAND_LINE
|
|
|
|
|
.byte "root=/dev/ram0 ro"
|
|
|
|
|
.byte 0
|
|
|
|
|
.org 0x11000
|
|
|
|
|
.Lsccb:
|
|
|
|
|
.hword 0x1000 # length, one page
|
|
|
|
|
.byte 0x00,0x00,0x00
|
|
|
|
|
.byte 0x80 # variable response bit set
|
|
|
|
|
.Lsccbr:
|
|
|
|
|
.hword 0x00 # response code
|
|
|
|
|
.Lscpincr1:
|
|
|
|
|
.hword 0x00
|
|
|
|
|
.Lscpa1:
|
|
|
|
|
.byte 0x00
|
|
|
|
|
.fill 89,1,0
|
|
|
|
|
.Lscpa2:
|
|
|
|
|
.int 0x00
|
|
|
|
|
.Lscpincr2:
|
|
|
|
|
.quad 0x00
|
|
|
|
|
.fill 3984,1,0
|
|
|
|
|
.org 0x12000
|
|
|
|
|
.global _pend
|
|
|
|
|
_pend:
|
|
|
|
|
|
|
|
|
|
#ifdef CONFIG_SHARED_KERNEL
|
|
|
|
|
.org 0x100000
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
#
|
|
|
|
|
# startup-code, running in virtual mode
|
|
|
|
|
#
|
|
|
|
|
.globl _stext
|
|
|
|
|
_stext: basr %r13,0 # get base
|
|
|
|
|
.LPG2:
|
|
|
|
|
#
|
|
|
|
|
# Setup stack
|
|
|
|
|
#
|
|
|
|
|
l %r15,.Linittu-.LPG2(%r13)
|
|
|
|
|
mvc __LC_CURRENT(4),__TI_task(%r15)
|
|
|
|
|
ahi %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union + THREAD_SIZE
|
|
|
|
|
st %r15,__LC_KERNEL_STACK # set end of kernel stack
|
|
|
|
|
ahi %r15,-96
|
|
|
|
|
xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear backchain
|
|
|
|
|
|
|
|
|
|
# check control registers
|
|
|
|
|
stctl %c0,%c15,0(%r15)
|
2005-07-27 11:45:00 -07:00
|
|
|
oi 2(%r15),0x40 # enable sigp emergency signal
|
2005-04-16 15:20:36 -07:00
|
|
|
oi 0(%r15),0x10 # switch on low address protection
|
|
|
|
|
lctl %c0,%c15,0(%r15)
|
|
|
|
|
|
|
|
|
|
#
|
|
|
|
|
lam 0,15,.Laregs-.LPG2(%r13) # load access regs needed by uaccess
|
|
|
|
|
l %r14,.Lstart-.LPG2(%r13)
|
|
|
|
|
basr %r14,%r14 # call start_kernel
|
|
|
|
|
#
|
|
|
|
|
# We returned from start_kernel ?!? PANIK
|
|
|
|
|
#
|
|
|
|
|
basr %r13,0
|
|
|
|
|
lpsw .Ldw-.(%r13) # load disabled wait psw
|
|
|
|
|
#
|
|
|
|
|
.align 8
|
|
|
|
|
.Ldw: .long 0x000a0000,0x00000000
|
|
|
|
|
.Linittu: .long init_thread_union
|
|
|
|
|
.Lstart: .long start_kernel
|
|
|
|
|
.Laregs: .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
|
|
|
|
|
