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34 lines
917 B
34 lines
917 B
17 years ago
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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/code-patching.h>
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void create_instruction(unsigned long addr, unsigned int instr)
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{
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unsigned int *p;
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p = (unsigned int *)addr;
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*p = instr;
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asm ("dcbst 0, %0; sync; icbi 0,%0; sync; isync" : : "r" (p));
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}
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void create_branch(unsigned long addr, unsigned long target, int flags)
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{
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unsigned int instruction;
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if (! (flags & BRANCH_ABSOLUTE))
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target = target - addr;
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/* Mask out the flags and target, so they don't step on each other. */
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instruction = 0x48000000 | (flags & 0x3) | (target & 0x03FFFFFC);
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create_instruction(addr, instruction);
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}
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