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 s16 len; /* end of original instructions */
26 u16 cond; /* see ALT_COND_XXX */
27 u32 replacement; /* replacement instruction or code */
28 } __packed;
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, \"a\" !" \
38 ".align 4 !" \
39 ".word (0b-4-.) !" \
40 ".hword 1, " __stringify(cond) " !" \
41 ".word " __stringify(replacement) " !" \
42 ".previous"
43
44 #else
45
46 /* to replace one single instructions by a new instruction */
47 #define ALTERNATIVE(from, to, cond, replacement)\
48 .section .altinstructions, "a" ! \
49 .align 4 ! \
50 .word (from - .) ! \
51 .hword (to - from)/4, cond ! \
52 .word replacement ! \
53 .previous
54
55 /* to replace multiple instructions by new code */
56 #define ALTERNATIVE_CODE(from, num_instructions, cond, new_instr_ptr)\
57 .section .altinstructions, "a" ! \
58 .align 4 ! \
59 .word (from - .) ! \
60 .hword -num_instructions, cond ! \
61 .word (new_instr_ptr - .) ! \
62 .previous
63
64 #endif /* __ASSEMBLY__ */
65
66 #endif /* __ASM_PARISC_ALTERNATIVE_H */
67
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