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5571dc824b
We can re-use the s390-ccw bios code to implement a small firmware for a s390x guest which prints out the "A" and "B" characters and modifies the memory, as required for the migration test. [quintela: Converted the compile script to Makefile rules] Signed-off-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Thomas Huth <thuth@redhat.com> Message-Id: <1539078677-25396-1-git-send-email-thuth@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Fixed up Makefile since the aarch patch sneaked in first
37 lines
865 B
C
37 lines
865 B
C
/*
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* S390 guest code used in migration tests
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*
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* Copyright 2018 Thomas Huth, Red Hat Inc.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#define LOADPARM_LEN 8 /* Needed for sclp.h */
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#include <libc.h>
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#include <s390-ccw.h>
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#include <sclp.h>
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char stack[0x8000] __attribute__((aligned(4096)));
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#define START_ADDRESS (1024 * 1024)
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#define END_ADDRESS (100 * 1024 * 1024)
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void main(void)
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{
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unsigned long addr;
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sclp_setup();
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sclp_print("A");
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while (1) {
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for (addr = START_ADDRESS; addr < END_ADDRESS; addr += 4096) {
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*(volatile char *)addr += 1; /* Change pages */
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}
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sclp_print("B");
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}
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}
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