mirror of https://gitee.com/openkylin/linux.git
57 lines
1.4 KiB
C
57 lines
1.4 KiB
C
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/*
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* Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org)
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*
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* Modifications for ppc64:
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* Copyright (C) 2003 Dave Engebretsen <engebret@us.ibm.com>
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*
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* Copyright 2008 Michael Ellerman, IBM Corporation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <asm/cputable.h>
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#include <asm/code-patching.h>
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struct fixup_entry {
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unsigned long mask;
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unsigned long value;
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long start_off;
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long end_off;
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};
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static void patch_feature_section(unsigned long value, struct fixup_entry *fcur)
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{
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unsigned int *pstart, *pend, *p;
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if ((value & fcur->mask) == fcur->value)
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return;
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pstart = ((unsigned int *)fcur) + (fcur->start_off / 4);
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pend = ((unsigned int *)fcur) + (fcur->end_off / 4);
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for (p = pstart; p < pend; p++) {
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*p = PPC_NOP_INSTR;
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asm volatile ("dcbst 0, %0" : : "r" (p));
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}
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asm volatile ("sync" : : : "memory");
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for (p = pstart; p < pend; p++)
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asm volatile ("icbi 0,%0" : : "r" (p));
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asm volatile ("sync; isync" : : : "memory");
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}
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void do_feature_fixups(unsigned long value, void *fixup_start, void *fixup_end)
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{
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struct fixup_entry *fcur, *fend;
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fcur = fixup_start;
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fend = fixup_end;
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for (; fcur < fend; fcur++)
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patch_feature_section(value, fcur);
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}
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