1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __ASM_PARISC_ALTERNATIVE_H 3 #define __ASM_PARISC_ALTERNATIVE_H 4 5 #define ALT_COND_ALWAYS 0x80 /* always replace instruction */ 6 #define ALT_COND_NO_SMP 0x01 /* when running UP instead of SMP */ 7 #define ALT_COND_NO_DCACHE 0x02 /* if system has no d-cache */ 8 #define ALT_COND_NO_ICACHE 0x04 /* if system has no i-cache */ 9 #define ALT_COND_NO_SPLIT_TLB 0x08 /* if split_tlb == 0 */ 10 #define ALT_COND_NO_IOC_FDC 0x10 /* if I/O cache does not need flushes */ 11 12 #define INSN_PxTLB 0x02 /* modify pdtlb, pitlb */ 13 #define INSN_NOP 0x08000240 /* nop */ 14 15 #ifndef __ASSEMBLY__ 16 17 #include <linux/init.h> 18 #include <linux/types.h> 19 #include <linux/stddef.h> 20 #include <linux/stringify.h> 21 22 struct alt_instr { 23 s32 orig_offset; /* offset to original instructions */ 24 u32 len; /* end of original instructions */ 25 u32 cond; /* see ALT_COND_XXX */ 26 u32 replacement; /* replacement instruction or code */ 27 }; 28 29 void set_kernel_text_rw(int enable_read_write); 30 void apply_alternatives_all(void); 31 void apply_alternatives(struct alt_instr *start, struct alt_instr *end, 32 const char *module_name); 33 34 /* Alternative SMP implementation. */ 35 #define ALTERNATIVE(cond, replacement) "!0:" \ 36 ".section .altinstructions, \"aw\" !" \ 37 ".word (0b-4-.), 1, " __stringify(cond) "," \ 38 __stringify(replacement) " !" \ 39 ".previous" 40 41 #else 42 43 #define ALTERNATIVE(from, to, cond, replacement)\ 44 .section .altinstructions, "aw" ! \ 45 .word (from - .), (to - from)/4 ! \ 46 .word cond, replacement ! \ 47 .previous 48 49 #endif /* __ASSEMBLY__ */ 50 51 #endif /* __ASM_PARISC_ALTERNATIVE_H */ 52