560 lines
14 KiB
ArmAsm
560 lines
14 KiB
ArmAsm
/*
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* Copyright IBM Corp. 1999,2009
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*
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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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* Heiko Carstens <heiko.carstens@de.ibm.com>
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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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*
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*/
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#include <linux/init.h>
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#include <asm/setup.h>
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#include <asm/lowcore.h>
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#include <asm/asm-offsets.h>
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#include <asm/thread_info.h>
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#include <asm/page.h>
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#include <asm/cpu.h>
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#ifdef CONFIG_64BIT
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#define ARCH_OFFSET 4
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#else
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#define ARCH_OFFSET 0
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#endif
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__HEAD
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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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# Parameters:
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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 0x78(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+ARCH_OFFSET-PARMAREA(%r12) # save 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,.Linitrd # ramdisk loc. is 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,.Linitrd
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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
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mvc 0(256,%r3),0(%r4)
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mvc 256(256,%r3),256(%r4)
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mvc 512(256,%r3),512(%r4)
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mvc 768(122,%r3),768(%r4)
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slr %r0,%r0
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b .Lcntlp
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.Ldelspc:
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ic %r0,0(%r2,%r3)
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chi %r0,0x20 # is it a space ?
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be .Lcntlp
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ahi %r2,1
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b .Leolp
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.Lcntlp:
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brct %r2,.Ldelspc
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.Leolp:
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slr %r0,%r0
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stc %r0,0(%r2,%r3) # terminate buffer
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.Lnopf:
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#
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# load ramdisk from ipl device
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#
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.Lagain2:
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l %r2,.Linitrd # addr of ramdisk
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st %r2,INITRD_START+ARCH_OFFSET-PARMAREA(%r12)
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bas %r14,.Lloader # load ramdisk
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st %r2,INITRD_SIZE+ARCH_OFFSET-PARMAREA(%r12) # store size of rd
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ltr %r2,%r2
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bnz .Lrdcont
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st %r2,INITRD_START+ARCH_OFFSET-PARMAREA(%r12) # no ramdisk found
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.Lrdcont:
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l %r2,.Linitrd
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clc 0(3,%r2),.L_hdr # skip HDRx and EOFx
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bz .Lagain2
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clc 0(3,%r2),.L_eof
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bz .Lagain2
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#ifdef CONFIG_IPL_VM
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#
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# reset files in VM reader
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#
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stidp __LC_CPUID # store cpuid
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tm __LC_CPUID,0xff # running VM ?
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bno .Lnoreset
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la %r2,.Lreset
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lhi %r3,26
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diag %r2,%r3,8
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la %r5,.Lirb
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stsch 0(%r5) # check if irq is pending
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tm 30(%r5),0x0f # by verifying if any of the
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bnz .Lwaitforirq # activity or status control
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tm 31(%r5),0xff # bits is set in the schib
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bz .Lnoreset
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.Lwaitforirq:
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mvc 0x78(8),.Lrdrnewpsw # set up IO interrupt psw
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.Lwaitrdrirq:
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lpsw .Lrdrwaitpsw
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.Lrdrint:
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c %r1,0xb8 # compare subchannel number
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bne .Lwaitrdrirq
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la %r5,.Lirb
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tsch 0(%r5)
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.Lnoreset:
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b .Lnoload
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.align 8
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.Lrdrnewpsw:
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.long 0x00080000,0x80000000+.Lrdrint
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.Lrdrwaitpsw:
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.long 0x020a0000,0x80000000+.Lrdrint
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#endif
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#
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# everything loaded, go for it
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#
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.Lnoload:
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l %r1,.Lstartup
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br %r1
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.Linitrd:.long _end + 0x400000 # default address of initrd
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.Lparm: .long PARMAREA
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.Lstartup: .long startup
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.Lcvtab:.long _ebcasc # ebcdic to ascii table
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.Lreset:.byte 0xc3,0xc8,0xc1,0xd5,0xc7,0xc5,0x40,0xd9,0xc4,0xd9,0x40
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.byte 0xc1,0xd3,0xd3,0x40,0xd2,0xc5,0xc5,0xd7,0x40,0xd5,0xd6
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.byte 0xc8,0xd6,0xd3,0xc4 # "change rdr all keep nohold"
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.L_eof: .long 0xc5d6c600 /* C'EOF' */
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.L_hdr: .long 0xc8c4d900 /* C'HDR' */
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#endif /* CONFIG_IPL */
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#
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# SALIPL loader support. Based on a patch by Rob van der Heij.
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# This entry point is called directly from the SALIPL loader and
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# doesn't need a builtin ipl record.
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#
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.org 0x800
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.globl start
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start:
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stm %r0,%r15,0x07b0 # store registers
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basr %r12,%r0
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.base:
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l %r11,.parm
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l %r8,.cmd # pointer to command buffer
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ltr %r9,%r9 # do we have SALIPL parameters?
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bp .sk8x8
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mvc 0(64,%r8),0x00b0 # copy saved registers
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xc 64(240-64,%r8),0(%r8) # remainder of buffer
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tr 0(64,%r8),.lowcase
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b .gotr
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.sk8x8:
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mvc 0(240,%r8),0(%r9) # copy iplparms into buffer
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.gotr:
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l %r10,.tbl # EBCDIC to ASCII table
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tr 0(240,%r8),0(%r10)
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slr %r0,%r0
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st %r0,INITRD_SIZE+ARCH_OFFSET-PARMAREA(%r11)
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st %r0,INITRD_START+ARCH_OFFSET-PARMAREA(%r11)
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j startup # continue with startup
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.tbl: .long _ebcasc # translate table
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.cmd: .long COMMAND_LINE # address of command line buffer
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.parm: .long PARMAREA
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.lowcase:
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.byte 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07
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.byte 0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f
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.byte 0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17
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.byte 0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f
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.byte 0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27
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.byte 0x28,0x29,0x2a,0x2b,0x2c,0x2d,0x2e,0x2f
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.byte 0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37
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.byte 0x38,0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f
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.byte 0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47
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.byte 0x48,0x49,0x4a,0x4b,0x4c,0x4d,0x4e,0x4f
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.byte 0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57
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.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 absolute addressing 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
|
|
.LPG0:
|
|
xc 0x200(256),0x200 # partially clear lowcore
|
|
xc 0x300(256),0x300
|
|
l %r1,5f-.LPG0(%r13)
|
|
stck 0(%r1)
|
|
spt 6f-.LPG0(%r13)
|
|
mvc __LC_LAST_UPDATE_CLOCK(8),0(%r1)
|
|
mvc __LC_LAST_UPDATE_TIMER(8),6f-.LPG0(%r13)
|
|
mvc __LC_EXIT_TIMER(8),5f-.LPG0(%r13)
|
|
#ifndef CONFIG_MARCH_G5
|
|
# check capabilities against MARCH_{G5,Z900,Z990,Z9_109,Z10}
|
|
xc __LC_STFL_FAC_LIST(8),__LC_STFL_FAC_LIST
|
|
stfl __LC_STFL_FAC_LIST # store facility list
|
|
tm __LC_STFL_FAC_LIST,0x01 # stfle available ?
|
|
jz 0f
|
|
la %r0,0
|
|
.insn s,0xb2b00000,__LC_STFL_FAC_LIST # store facility list extended
|
|
0: l %r0,__LC_STFL_FAC_LIST
|
|
n %r0,2f+8-.LPG0(%r13)
|
|
cl %r0,2f+8-.LPG0(%r13)
|
|
jne 1f
|
|
l %r0,__LC_STFL_FAC_LIST+4
|
|
n %r0,2f+12-.LPG0(%r13)
|
|
cl %r0,2f+12-.LPG0(%r13)
|
|
je 3f
|
|
1: l %r15,.Lstack-.LPG0(%r13)
|
|
ahi %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union+THREAD_SIZE
|
|
ahi %r15,-96
|
|
la %r2,.Lals_string-.LPG0(%r13)
|
|
l %r3,.Lsclp_print-.LPG0(%r13)
|
|
basr %r14,%r3
|
|
lpsw 2f-.LPG0(%r13) # machine type not good enough, crash
|
|
.Lals_string:
|
|
.asciz "The Linux kernel requires more recent processor hardware"
|
|
.Lsclp_print:
|
|
.long _sclp_print_early
|
|
.Lstack:
|
|
.long init_thread_union
|
|
.align 16
|
|
2: .long 0x000a0000,0x8badcccc
|
|
#if defined(CONFIG_64BIT)
|
|
#if defined(CONFIG_MARCH_Z10)
|
|
.long 0xc100efe3, 0xf0680000
|
|
#elif defined(CONFIG_MARCH_Z9_109)
|
|
.long 0xc100efc3, 0x00000000
|
|
#elif defined(CONFIG_MARCH_Z990)
|
|
.long 0xc0002000, 0x00000000
|
|
#elif defined(CONFIG_MARCH_Z900)
|
|
.long 0xc0000000, 0x00000000
|
|
#endif
|
|
#else
|
|
#if defined(CONFIG_MARCH_Z10)
|
|
.long 0x8100c880, 0x00000000
|
|
#elif defined(CONFIG_MARCH_Z9_109)
|
|
.long 0x8100c880, 0x00000000
|
|
#elif defined(CONFIG_MARCH_Z990)
|
|
.long 0x80002000, 0x00000000
|
|
#elif defined(CONFIG_MARCH_Z900)
|
|
.long 0x80000000, 0x00000000
|
|
#endif
|
|
#endif
|
|
3:
|
|
#endif
|
|
|
|
l %r13,4f-.LPG0(%r13)
|
|
b 0(%r13)
|
|
.align 4
|
|
4: .long startup_continue
|
|
5: .long sched_clock_base_cc
|
|
.align 8
|
|
6: .long 0x7fffffff,0xffffffff
|
|
|
|
#
|
|
# params at 10400 (setup.h)
|
|
#
|
|
.org PARMAREA
|
|
.long 0,0 # IPL_DEVICE
|
|
.long 0,0 # INITRD_START
|
|
.long 0,0 # INITRD_SIZE
|
|
|
|
.org COMMAND_LINE
|
|
.byte "root=/dev/ram0 ro"
|
|
.byte 0
|
|
|
|
#ifdef CONFIG_64BIT
|
|
#include "head64.S"
|
|
#else
|
|
#include "head31.S"
|
|
#endif
|