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 #define ALT_COND_RUN_ON_QEMU 0x20 /* if running on QEMU */ 12 13 #define INSN_PxTLB 0x02 /* modify pdtlb, pitlb */ 14 #define INSN_NOP 0x08000240 /* nop */ 15 16 #ifndef __ASSEMBLY__ 17 18 #include <linux/init.h> 19 #include <linux/types.h> 20 #include <linux/stddef.h> 21 #include <linux/stringify.h> 22 23 struct alt_instr { 24 s32 orig_offset; /* offset to original instructions */ 25 s32 len; /* end of original instructions */ 26 u32 cond; /* see ALT_COND_XXX */ 27 u32 replacement; /* replacement instruction or code */ 28 }; 29 30 void set_kernel_text_rw(int enable_read_write); 31 void apply_alternatives_all(void); 32 void apply_alternatives(struct alt_instr *start, struct alt_instr *end, 33 const char *module_name); 34 35 /* Alternative SMP implementation. */ 36 #define ALTERNATIVE(cond, replacement) "!0:" \ 37 ".section .altinstructions, \"aw\" !" \ 38 ".word (0b-4-.), 1, " __stringify(cond) "," \ 39 __stringify(replacement) " !" \ 40 ".previous" 41 42 #else 43 44 /* to replace one single instructions by a new instruction */ 45 #define ALTERNATIVE(from, to, cond, replacement)\ 46 .section .altinstructions, "aw" ! \ 47 .word (from - .), (to - from)/4 ! \ 48 .word cond, replacement ! \ 49 .previous 50 51 /* to replace multiple instructions by new code */ 52 #define ALTERNATIVE_CODE(from, num_instructions, cond, new_instr_ptr)\ 53 .section .altinstructions, "aw" ! \ 54 .word (from - .), -num_instructions ! \ 55 .word cond, (new_instr_ptr - .) ! \ 56 .previous 57 58 #endif /* __ASSEMBLY__ */ 59 60 #endif /* __ASM_PARISC_ALTERNATIVE_H */ 61