/* SPDX-License-Identifier: GPL-2.0 */
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/*
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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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#include <asm/sigp.h>
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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,SIGP_SET_ARCHITECTURE # 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: lpswe .Lrestart_psw-0b(%r13) # Start new kernel...
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.align 8
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.Lrestart_psw:
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.quad 0x0000000080000000,0x0000000000000000 + startup
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#else
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.align 2
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.Lep_startup_kdump:
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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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#endif /* CONFIG_CRASH_DUMP */
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