David Daney | 94bb0c1 | 2010-12-28 13:26:23 -0800 | [diff] [blame] | 1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public |
| 3 | * License. See the file "COPYING" in the main directory of this archive |
| 4 | * for more details. |
| 5 | * |
| 6 | * Copyright (c) 2010 Cavium Networks, Inc. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/jump_label.h> |
| 10 | #include <linux/kernel.h> |
| 11 | #include <linux/memory.h> |
| 12 | #include <linux/mutex.h> |
| 13 | #include <linux/types.h> |
| 14 | #include <linux/cpu.h> |
| 15 | |
| 16 | #include <asm/cacheflush.h> |
| 17 | #include <asm/inst.h> |
| 18 | |
| 19 | #ifdef HAVE_JUMP_LABEL |
| 20 | |
| 21 | #define J_RANGE_MASK ((1ul << 28) - 1) |
| 22 | |
| 23 | void arch_jump_label_transform(struct jump_entry *e, |
| 24 | enum jump_label_type type) |
| 25 | { |
| 26 | union mips_instruction insn; |
| 27 | union mips_instruction *insn_p = |
| 28 | (union mips_instruction *)(unsigned long)e->code; |
| 29 | |
Maciej W. Rozycki | 99436f7 | 2014-11-17 16:09:54 +0000 | [diff] [blame^] | 30 | /* Jump only works within a 256MB aligned region of its delay slot. */ |
| 31 | BUG_ON((e->target & ~J_RANGE_MASK) != ((e->code + 4) & ~J_RANGE_MASK)); |
David Daney | 94bb0c1 | 2010-12-28 13:26:23 -0800 | [diff] [blame] | 32 | |
| 33 | /* Target must have 4 byte alignment. */ |
| 34 | BUG_ON((e->target & 3) != 0); |
| 35 | |
| 36 | if (type == JUMP_LABEL_ENABLE) { |
| 37 | insn.j_format.opcode = j_op; |
| 38 | insn.j_format.target = (e->target & J_RANGE_MASK) >> 2; |
| 39 | } else { |
| 40 | insn.word = 0; /* nop */ |
| 41 | } |
| 42 | |
| 43 | get_online_cpus(); |
| 44 | mutex_lock(&text_mutex); |
| 45 | *insn_p = insn; |
| 46 | |
| 47 | flush_icache_range((unsigned long)insn_p, |
| 48 | (unsigned long)insn_p + sizeof(*insn_p)); |
| 49 | |
| 50 | mutex_unlock(&text_mutex); |
| 51 | put_online_cpus(); |
| 52 | } |
| 53 | |
| 54 | #endif /* HAVE_JUMP_LABEL */ |