2 * Copyright 2008 Michael Ellerman, IBM Corporation.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
10 #include <linux/kernel.h>
11 #include <asm/code-patching.h>
14 void patch_instruction(unsigned int *addr, unsigned int instr)
17 asm ("dcbst 0, %0; sync; icbi 0,%0; sync; isync" : : "r" (addr));
20 void patch_branch(unsigned int *addr, unsigned long target, int flags)
22 patch_instruction(addr, create_branch(addr, target, flags));
25 unsigned int create_branch(const unsigned int *addr,
26 unsigned long target, int flags)
28 unsigned int instruction;
32 if (! (flags & BRANCH_ABSOLUTE))
33 offset = offset - (unsigned long)addr;
35 /* Check we can represent the target in the instruction format */
36 if (offset < -0x2000000 || offset > 0x1fffffc || offset & 0x3)
39 /* Mask out the flags and target, so they don't step on each other. */
40 instruction = 0x48000000 | (flags & 0x3) | (offset & 0x03FFFFFC);