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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_S390_RUNTIME_CONST_H
3#define _ASM_S390_RUNTIME_CONST_H
4
5#include <linux/uaccess.h>
6
7#define runtime_const_ptr(sym) \
8({ \
9 typeof(sym) __ret; \
10 \
11 asm_inline( \
12 "0: iihf %[__ret],%[c1]\n" \
13 " iilf %[__ret],%[c2]\n" \
14 ".pushsection runtime_ptr_" #sym ",\"a\"\n" \
15 ".long 0b - .\n" \
16 ".popsection" \
17 : [__ret] "=d" (__ret) \
18 : [c1] "i" (0x01234567UL), \
19 [c2] "i" (0x89abcdefUL)); \
20 __ret; \
21})
22
23#define runtime_const_shift_right_32(val, sym) \
24({ \
25 unsigned int __ret = (val); \
26 \
27 asm_inline( \
28 "0: srl %[__ret],12\n" \
29 ".pushsection runtime_shift_" #sym ",\"a\"\n" \
30 ".long 0b - .\n" \
31 ".popsection" \
32 : [__ret] "+d" (__ret)); \
33 __ret; \
34})
35
36#define runtime_const_mask_32(val, sym) \
37({ \
38 unsigned int __ret = (val); \
39 \
40 asm_inline( \
41 "0: nilf %[__ret],12\n" \
42 ".pushsection runtime_mask_" #sym ",\"a\"\n" \
43 ".long 0b - .\n" \
44 ".popsection" \
45 : [__ret] "+d" (__ret) \
46 : : "cc"); \
47 __ret; \
48})
49
50#define runtime_const_init(type, sym) do { \
51 extern s32 __start_runtime_##type##_##sym[]; \
52 extern s32 __stop_runtime_##type##_##sym[]; \
53 \
54 runtime_const_fixup(__runtime_fixup_##type, \
55 (unsigned long)(sym), \
56 __start_runtime_##type##_##sym, \
57 __stop_runtime_##type##_##sym); \
58} while (0)
59
60static inline void __runtime_fixup_32(u32 *p, unsigned int val)
61{
62 s390_kernel_write(p, &val, sizeof(val));
63}
64
65/* 32-bit immediate for iihf and iilf in bits in I2 field */
66static inline void __runtime_fixup_ptr(void *where, unsigned long val)
67{
68 __runtime_fixup_32(where + 2, val >> 32);
69 __runtime_fixup_32(where + 8, val);
70}
71
72/* Immediate value is lower 12 bits of D2 field of srl */
73static inline void __runtime_fixup_shift(void *where, unsigned long val)
74{
75 u32 insn = *(u32 *)where;
76
77 insn &= 0xfffff000;
78 insn |= (val & 63);
79 s390_kernel_write(where, &insn, sizeof(insn));
80}
81
82/* 32-bit immediate for nilf in bits in I2 field */
83static inline void __runtime_fixup_mask(void *where, unsigned long val)
84{
85 __runtime_fixup_32(where + 2, val);
86}
87
88static inline void runtime_const_fixup(void (*fn)(void *, unsigned long),
89 unsigned long val, s32 *start, s32 *end)
90{
91 while (start < end) {
92 fn(*start + (void *)start, val);
93 start++;
94 }
95}
96
97#endif /* _ASM_S390_RUNTIME_CONST_H */