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Diffstat (limited to '')
| -rw-r--r-- | arch/parisc/include/asm/alternative.h | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/arch/parisc/include/asm/alternative.h b/arch/parisc/include/asm/alternative.h new file mode 100644 index 0000000000..1eb488f25b --- /dev/null +++ b/arch/parisc/include/asm/alternative.h @@ -0,0 +1,66 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ASM_PARISC_ALTERNATIVE_H +#define __ASM_PARISC_ALTERNATIVE_H + +#define ALT_COND_ALWAYS 0x80 /* always replace instruction */ +#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 ALT_COND_RUN_ON_QEMU 0x20 /* if running on QEMU */ + +#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 */ + s16 len; /* end of original instructions */ + u16 cond; /* see ALT_COND_XXX */ + u32 replacement; /* replacement instruction or code */ +} __packed; + +void set_kernel_text_rw(int enable_read_write); +void apply_alternatives_all(void); +void apply_alternatives(struct alt_instr *start, struct alt_instr *end, + const char *module_name); + +/* Alternative SMP implementation. */ +#define ALTERNATIVE(cond, replacement) "!0:" \ + ".section .altinstructions, \"a\" !" \ + ".align 4 !" \ + ".word (0b-4-.) !" \ + ".hword 1, " __stringify(cond) " !" \ + ".word " __stringify(replacement) " !" \ + ".previous" + +#else + +/* to replace one single instructions by a new instruction */ +#define ALTERNATIVE(from, to, cond, replacement)\ + .section .altinstructions, "a" ! \ + .align 4 ! \ + .word (from - .) ! \ + .hword (to - from)/4, cond ! \ + .word replacement ! \ + .previous + +/* to replace multiple instructions by new code */ +#define ALTERNATIVE_CODE(from, num_instructions, cond, new_instr_ptr)\ + .section .altinstructions, "a" ! \ + .align 4 ! \ + .word (from - .) ! \ + .hword -num_instructions, cond ! \ + .word (new_instr_ptr - .) ! \ + .previous + +#endif /* __ASSEMBLY__ */ + +#endif /* __ASM_PARISC_ALTERNATIVE_H */ |