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Diffstat (limited to 'arch/parisc/include/asm/alternative.h')
| -rw-r--r-- | arch/parisc/include/asm/alternative.h | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/arch/parisc/include/asm/alternative.h b/arch/parisc/include/asm/alternative.h new file mode 100644 index 000000000000..bf485a94d0b4 --- /dev/null +++ b/arch/parisc/include/asm/alternative.h @@ -0,0 +1,47 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ASM_PARISC_ALTERNATIVE_H +#define __ASM_PARISC_ALTERNATIVE_H + +#define ALT_COND_NO_SMP 0x01 /* when running UP instead of SMP */ +#define ALT_COND_NO_DCACHE 0x02 /* if system has no d-cache */ +#define ALT_COND_NO_ICACHE 0x04 /* if system has no i-cache */ +#define ALT_COND_NO_SPLIT_TLB 0x08 /* if split_tlb == 0 */ +#define ALT_COND_NO_IOC_FDC 0x10 /* if I/O cache does not need flushes */ + +#define INSN_PxTLB 0x02 /* modify pdtlb, pitlb */ +#define INSN_NOP 0x08000240 /* nop */ + +#ifndef __ASSEMBLY__ + +#include <linux/init.h> +#include <linux/types.h> +#include <linux/stddef.h> +#include <linux/stringify.h> + +struct alt_instr { + s32 orig_offset; /* offset to original instructions */ + u32 len; /* end of original instructions */ + u32 cond; /* see ALT_COND_XXX */ + u32 replacement; /* replacement instruction or code */ +}; + +void set_kernel_text_rw(int enable_read_write); + +/* Alternative SMP implementation. */ +#define ALTERNATIVE(cond, replacement) "!0:" \ + ".section .altinstructions, \"aw\" !" \ + ".word (0b-4-.), 1, " __stringify(cond) "," \ + __stringify(replacement) " !" \ + ".previous" + +#else + +#define ALTERNATIVE(from, to, cond, replacement)\ + .section .altinstructions, "aw" ! \ + .word (from - .), (to - from)/4 ! \ + .word cond, replacement ! \ + .previous + +#endif /* __ASSEMBLY__ */ + +#endif /* __ASM_PARISC_ALTERNATIVE_H */ |