| Michael Ellerman | aaddd3e | 2008-06-24 11:32:21 +1000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2008 Michael Ellerman, IBM Corporation. |
| 3 | * |
| 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. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/kernel.h> |
| 11 | #include <asm/code-patching.h> |
| 12 | |
| 13 | |
| 14 | void create_instruction(unsigned long addr, unsigned int instr) |
| 15 | { |
| 16 | unsigned int *p; |
| 17 | p = (unsigned int *)addr; |
| 18 | *p = instr; |
| 19 | asm ("dcbst 0, %0; sync; icbi 0,%0; sync; isync" : : "r" (p)); |
| 20 | } |
| 21 | |
| 22 | void create_branch(unsigned long addr, unsigned long target, int flags) |
| 23 | { |
| 24 | unsigned int instruction; |
| 25 | |
| 26 | if (! (flags & BRANCH_ABSOLUTE)) |
| 27 | target = target - addr; |
| 28 | |
| 29 | /* Mask out the flags and target, so they don't step on each other. */ |
| 30 | instruction = 0x48000000 | (flags & 0x3) | (target & 0x03FFFFFC); |
| 31 | |
| 32 | create_instruction(addr, instruction); |
| 33 | } |