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