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 */