projects / linux-block.git / blame
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|---|---|---|
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1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef _ASM_S390_ALTERNATIVE_ASM_H | |
| 3 | #define _ASM_S390_ALTERNATIVE_ASM_H | |
| 4 | ||
| 5 | #ifdef __ASSEMBLY__ | |
| 6 | ||
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7 | /* |
| 8 | * Issue one struct alt_instr descriptor entry (need to put it into | |
| 9 | * the section .altinstructions, see below). This entry contains | |
| 10 | * enough information for the alternatives patching code to patch an | |
| 11 | * instruction. See apply_alternatives(). | |
| 12 | */ | |
| 13 | .macro alt_entry orig_start, orig_end, alt_start, alt_end, feature | |
| 14 | .long \orig_start - . | |
| 15 | .long \alt_start - . | |
| 16 | .word \feature | |
| 17 | .byte \orig_end - \orig_start | |
| 207ddb91 | 18 | .org . - ( \orig_end - \orig_start ) & 1 |
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19 | .org . - ( \orig_end - \orig_start ) + ( \alt_end - \alt_start ) |
| 20 | .org . - ( \alt_end - \alt_start ) + ( \orig_end - \orig_start ) | |
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21 | .endm |
| 22 | ||
| 23 | /* | |
| 24 | * Define an alternative between two instructions. If @feature is | |
| 25 | * present, early code in apply_alternatives() replaces @oldinstr with | |
| e6ed91fd | 26 | * @newinstr. |
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27 | */ |
| 28 | .macro ALTERNATIVE oldinstr, newinstr, feature | |
| 29 | .pushsection .altinstr_replacement,"ax" | |
| 30 | 770: \newinstr | |
| 31 | 771: .popsection | |
| 32 | 772: \oldinstr | |
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33 | 773: .pushsection .altinstructions,"a" |
| 34 | alt_entry 772b, 773b, 770b, 771b, \feature | |
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35 | .popsection |
| 36 | .endm | |
| 37 | ||
| 38 | /* | |
| 39 | * Define an alternative between two instructions. If @feature is | |
| 40 | * present, early code in apply_alternatives() replaces @oldinstr with | |
| e6ed91fd | 41 | * @newinstr. |
| fba9eb79 MS |
42 | */ |
| 43 | .macro ALTERNATIVE_2 oldinstr, newinstr1, feature1, newinstr2, feature2 | |
| 44 | .pushsection .altinstr_replacement,"ax" | |
| 45 | 770: \newinstr1 | |
| 46 | 771: \newinstr2 | |
| 47 | 772: .popsection | |
| 48 | 773: \oldinstr | |
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49 | 774: .pushsection .altinstructions,"a" |
| 50 | alt_entry 773b, 774b, 770b, 771b,\feature1 | |
| 51 | alt_entry 773b, 774b, 771b, 772b,\feature2 | |
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52 | .popsection |
| 53 | .endm | |
| 54 | ||
| 55 | #endif /* __ASSEMBLY__ */ | |
| 56 | ||
| 57 | #endif /* _ASM_S390_ALTERNATIVE_ASM_H */ |