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