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