projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| e039ee4e AP |
1 | #ifndef __ASM_ALTERNATIVE_H |
| 2 | #define __ASM_ALTERNATIVE_H | |
| 3 | ||
| 4 | #include <linux/types.h> | |
| 5 | #include <linux/stddef.h> | |
| 6 | #include <linux/stringify.h> | |
| 7 | ||
| 8 | struct alt_instr { | |
| 9 | s32 orig_offset; /* offset to original instruction */ | |
| 10 | s32 alt_offset; /* offset to replacement instruction */ | |
| 11 | u16 cpufeature; /* cpufeature bit set for replacement */ | |
| 12 | u8 orig_len; /* size of original instruction(s) */ | |
| 13 | u8 alt_len; /* size of new instruction(s), <= orig_len */ | |
| 14 | }; | |
| 15 | ||
| 16 | void apply_alternatives(void); | |
| 17 | void free_alternatives_memory(void); | |
| 18 | ||
| 19 | #define ALTINSTR_ENTRY(feature) \ | |
| 20 | " .word 661b - .\n" /* label */ \ | |
| 21 | " .word 663f - .\n" /* new instruction */ \ | |
| 22 | " .hword " __stringify(feature) "\n" /* feature bit */ \ | |
| 23 | " .byte 662b-661b\n" /* source len */ \ | |
| 24 | " .byte 664f-663f\n" /* replacement len */ | |
| 25 | ||
| 26 | /* alternative assembly primitive: */ | |
| 27 | #define ALTERNATIVE(oldinstr, newinstr, feature) \ | |
| 28 | "661:\n\t" \ | |
| 29 | oldinstr "\n" \ | |
| 30 | "662:\n" \ | |
| 31 | ".pushsection .altinstructions,\"a\"\n" \ | |
| 32 | ALTINSTR_ENTRY(feature) \ | |
| 33 | ".popsection\n" \ | |
| 34 | ".pushsection .altinstr_replacement, \"a\"\n" \ | |
| 35 | "663:\n\t" \ | |
| 36 | newinstr "\n" \ | |
| 37 | "664:\n\t" \ | |
| 38 | ".popsection\n\t" \ | |
| 39 | ".if ((664b-663b) != (662b-661b))\n\t" \ | |
| 40 | " .error \"Alternatives instruction length mismatch\"\n\t"\ | |
| 41 | ".endif\n" | |
| 42 | ||
| 43 | #endif /* __ASM_ALTERNATIVE_H */ |