d7b7cdea06
Because of a design change for stand-alone kdump the function that was done by the OS info init function is moved to the boot loader code. This has two implications that are implemented by this patch: a) The OS info init function is no longer called by the kernel b) The diag 308 subcode 1 reset is no longer done by the kdump boot code. This is necessary because otherwise the operation that is done now by the boot loader would be reversed. For the normal kexec based kdump mechansim the reset is already done by the kdump trigger code (e.g. panic or PSW restart). Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
112 lines
2.6 KiB
ArmAsm
112 lines
2.6 KiB
ArmAsm
/*
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* S390 kdump lowlevel functions (new kernel)
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*
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* Copyright IBM Corp. 2011
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* Author(s): Michael Holzheu <holzheu@linux.vnet.ibm.com>
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*/
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#define DATAMOVER_ADDR 0x4000
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#define COPY_PAGE_ADDR 0x6000
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#ifdef CONFIG_CRASH_DUMP
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#
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# kdump entry (new kernel - not yet relocated)
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#
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# Note: This code has to be position independent
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#
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.align 2
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.Lep_startup_kdump:
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lhi %r1,2 # mode 2 = esame (dump)
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sigp %r1,%r0,0x12 # Switch to esame mode
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sam64 # Switch to 64 bit addressing
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basr %r13,0
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.Lbase:
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larl %r2,.Lbase_addr # Check, if we have been
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lg %r2,0(%r2) # already relocated:
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clgr %r2,%r13 #
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jne .Lrelocate # No : Start data mover
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lghi %r2,0 # Yes: Start kdump kernel
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brasl %r14,startup_kdump_relocated
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.Lrelocate:
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larl %r4,startup
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lg %r2,0x418(%r4) # Get kdump base
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lg %r3,0x420(%r4) # Get kdump size
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larl %r10,.Lcopy_start # Source of data mover
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lghi %r8,DATAMOVER_ADDR # Target of data mover
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mvc 0(256,%r8),0(%r10) # Copy data mover code
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agr %r8,%r2 # Copy data mover to
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mvc 0(256,%r8),0(%r10) # reserved mem
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lghi %r14,DATAMOVER_ADDR # Jump to copied data mover
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basr %r14,%r14
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.Lbase_addr:
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.quad .Lbase
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#
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# kdump data mover code (runs at address DATAMOVER_ADDR)
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#
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# r2: kdump base address
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# r3: kdump size
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#
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.Lcopy_start:
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basr %r13,0 # Base
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0:
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lgr %r11,%r2 # Save kdump base address
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lgr %r12,%r2
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agr %r12,%r3 # Compute kdump end address
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lghi %r5,0
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lghi %r10,COPY_PAGE_ADDR # Load copy page address
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1:
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mvc 0(256,%r10),0(%r5) # Copy old kernel to tmp
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mvc 0(256,%r5),0(%r11) # Copy new kernel to old
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mvc 0(256,%r11),0(%r10) # Copy tmp to new
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aghi %r11,256
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aghi %r5,256
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clgr %r11,%r12
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jl 1b
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lg %r14,.Lstartup_kdump-0b(%r13)
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basr %r14,%r14 # Start relocated kernel
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.Lstartup_kdump:
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.long 0x00000000,0x00000000 + startup_kdump_relocated
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.Lcopy_end:
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#
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# Startup of kdump (relocated new kernel)
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#
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.align 2
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startup_kdump_relocated:
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basr %r13,0
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0:
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mvc 0(8,%r0),.Lrestart_psw-0b(%r13) # Setup restart PSW
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sam31 # Switch to 31 bit addr mode
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sr %r1,%r1 # Erase register r1
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sr %r2,%r2 # Erase register r2
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sigp %r1,%r2,0x12 # Switch to 31 bit arch mode
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lpsw 0 # Start new kernel...
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.align 8
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.Lrestart_psw:
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.long 0x00080000,0x80000000 + startup
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#else
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.align 2
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.Lep_startup_kdump:
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#ifdef CONFIG_64BIT
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larl %r13,startup_kdump_crash
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lpswe 0(%r13)
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.align 8
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startup_kdump_crash:
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.quad 0x0002000080000000,0x0000000000000000 + startup_kdump_crash
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#else
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basr %r13,0
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0: lpsw startup_kdump_crash-0b(%r13)
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.align 8
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startup_kdump_crash:
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.long 0x000a0000,0x00000000 + startup_kdump_crash
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#endif /* CONFIG_64BIT */
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#endif /* CONFIG_CRASH_DUMP */
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