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e033b9a0c6
Change default load address of the initrd in case of IPL from reader. The new load address is directly behind the kernel image. This way we can see immediatly if there are any problems with the code which tries to rescue the initrd in case the bootmem bitmap would overlap with the initrd. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
547 lines
14 KiB
ArmAsm
547 lines
14 KiB
ArmAsm
/*
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* Copyright IBM Corp. 1999,2010
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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/asm-offsets.h>
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#include <asm/thread_info.h>
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#include <asm/page.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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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_SAVE_AREA # store cpuid
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tm __LC_SAVE_AREA,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 # default address of initrd
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.Lparm: .long PARMAREA
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.Lstartup: .long startup
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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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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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.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
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.byte 0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67
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.byte 0x68,0x69,0x6a,0x6b,0x6c,0x6d,0x6e,0x6f
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.byte 0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77
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.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
|
|
.globl startup
|
|
startup:
|
|
basr %r13,0 # get base
|
|
.LPG0:
|
|
xc 0x200(256),0x200 # partially clear lowcore
|
|
xc 0x300(256),0x300
|
|
stck __LC_LAST_UPDATE_CLOCK
|
|
spt 5f-.LPG0(%r13)
|
|
mvc __LC_LAST_UPDATE_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,-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 0x8000 + (1<<(PAGE_SHIFT+THREAD_ORDER))
|
|
.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
|
|
|
|
#ifdef CONFIG_64BIT
|
|
mvi __LC_AR_MODE_ID,1 # set esame flag
|
|
slr %r0,%r0 # set cpuid to zero
|
|
lhi %r1,2 # mode 2 = esame (dump)
|
|
sigp %r1,%r0,0x12 # switch to esame mode
|
|
sam64 # switch to 64 bit mode
|
|
larl %r13,4f
|
|
lmh %r0,%r15,0(%r13) # clear high-order half
|
|
jg startup_continue
|
|
4: .fill 16,4,0x0
|
|
#else
|
|
mvi __LC_AR_MODE_ID,0 # set ESA flag (mode 0)
|
|
l %r13,4f-.LPG0(%r13)
|
|
b 0(%r13)
|
|
.align 8
|
|
4: .long startup_continue
|
|
#endif
|
|
.align 8
|
|
5: .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
|
|
|
|
.org 0x11000
|