alternative-macros.h (6046B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef __ASM_ALTERNATIVE_MACROS_H 3#define __ASM_ALTERNATIVE_MACROS_H 4 5#ifdef CONFIG_RISCV_ALTERNATIVE 6 7#ifdef __ASSEMBLY__ 8 9.macro ALT_ENTRY oldptr newptr vendor_id errata_id new_len 10 RISCV_PTR \oldptr 11 RISCV_PTR \newptr 12 REG_ASM \vendor_id 13 REG_ASM \new_len 14 .word \errata_id 15.endm 16 17.macro ALT_NEW_CONTENT vendor_id, errata_id, enable = 1, new_c : vararg 18 .if \enable 19 .pushsection .alternative, "a" 20 ALT_ENTRY 886b, 888f, \vendor_id, \errata_id, 889f - 888f 21 .popsection 22 .subsection 1 23888 : 24 .option push 25 .option norvc 26 .option norelax 27 \new_c 28 .option pop 29889 : 30 .org . - (889b - 888b) + (887b - 886b) 31 .org . - (887b - 886b) + (889b - 888b) 32 .previous 33 .endif 34.endm 35 36.macro __ALTERNATIVE_CFG old_c, new_c, vendor_id, errata_id, enable 37886 : 38 .option push 39 .option norvc 40 .option norelax 41 \old_c 42 .option pop 43887 : 44 ALT_NEW_CONTENT \vendor_id, \errata_id, \enable, \new_c 45.endm 46 47#define _ALTERNATIVE_CFG(old_c, new_c, vendor_id, errata_id, CONFIG_k) \ 48 __ALTERNATIVE_CFG old_c, new_c, vendor_id, errata_id, IS_ENABLED(CONFIG_k) 49 50.macro __ALTERNATIVE_CFG_2 old_c, new_c_1, vendor_id_1, errata_id_1, enable_1, \ 51 new_c_2, vendor_id_2, errata_id_2, enable_2 52886 : 53 .option push 54 .option norvc 55 .option norelax 56 \old_c 57 .option pop 58887 : 59 ALT_NEW_CONTENT \vendor_id_1, \errata_id_1, \enable_1, \new_c_1 60 ALT_NEW_CONTENT \vendor_id_2, \errata_id_2, \enable_2, \new_c_2 61.endm 62 63#define _ALTERNATIVE_CFG_2(old_c, new_c_1, vendor_id_1, errata_id_1, \ 64 CONFIG_k_1, \ 65 new_c_2, vendor_id_2, errata_id_2, \ 66 CONFIG_k_2) \ 67 __ALTERNATIVE_CFG_2 old_c, new_c_1, vendor_id_1, errata_id_1, \ 68 IS_ENABLED(CONFIG_k_1), \ 69 new_c_2, vendor_id_2, errata_id_2, \ 70 IS_ENABLED(CONFIG_k_2) 71 72#else /* !__ASSEMBLY__ */ 73 74#include <asm/asm.h> 75#include <linux/stringify.h> 76 77#define ALT_ENTRY(oldptr, newptr, vendor_id, errata_id, newlen) \ 78 RISCV_PTR " " oldptr "\n" \ 79 RISCV_PTR " " newptr "\n" \ 80 REG_ASM " " vendor_id "\n" \ 81 REG_ASM " " newlen "\n" \ 82 ".word " errata_id "\n" 83 84#define ALT_NEW_CONTENT(vendor_id, errata_id, enable, new_c) \ 85 ".if " __stringify(enable) " == 1\n" \ 86 ".pushsection .alternative, \"a\"\n" \ 87 ALT_ENTRY("886b", "888f", __stringify(vendor_id), __stringify(errata_id), "889f - 888f") \ 88 ".popsection\n" \ 89 ".subsection 1\n" \ 90 "888 :\n" \ 91 ".option push\n" \ 92 ".option norvc\n" \ 93 ".option norelax\n" \ 94 new_c "\n" \ 95 ".option pop\n" \ 96 "889 :\n" \ 97 ".org . - (887b - 886b) + (889b - 888b)\n" \ 98 ".org . - (889b - 888b) + (887b - 886b)\n" \ 99 ".previous\n" \ 100 ".endif\n" 101 102#define __ALTERNATIVE_CFG(old_c, new_c, vendor_id, errata_id, enable) \ 103 "886 :\n" \ 104 ".option push\n" \ 105 ".option norvc\n" \ 106 ".option norelax\n" \ 107 old_c "\n" \ 108 ".option pop\n" \ 109 "887 :\n" \ 110 ALT_NEW_CONTENT(vendor_id, errata_id, enable, new_c) 111 112#define _ALTERNATIVE_CFG(old_c, new_c, vendor_id, errata_id, CONFIG_k) \ 113 __ALTERNATIVE_CFG(old_c, new_c, vendor_id, errata_id, IS_ENABLED(CONFIG_k)) 114 115#define __ALTERNATIVE_CFG_2(old_c, new_c_1, vendor_id_1, errata_id_1, \ 116 enable_1, \ 117 new_c_2, vendor_id_2, errata_id_2, \ 118 enable_2) \ 119 "886 :\n" \ 120 ".option push\n" \ 121 ".option norvc\n" \ 122 ".option norelax\n" \ 123 old_c "\n" \ 124 ".option pop\n" \ 125 "887 :\n" \ 126 ALT_NEW_CONTENT(vendor_id_1, errata_id_1, enable_1, new_c_1) \ 127 ALT_NEW_CONTENT(vendor_id_2, errata_id_2, enable_2, new_c_2) 128 129#define _ALTERNATIVE_CFG_2(old_c, new_c_1, vendor_id_1, errata_id_1, \ 130 CONFIG_k_1, \ 131 new_c_2, vendor_id_2, errata_id_2, \ 132 CONFIG_k_2) \ 133 __ALTERNATIVE_CFG_2(old_c, new_c_1, vendor_id_1, errata_id_1, \ 134 IS_ENABLED(CONFIG_k_1), \ 135 new_c_2, vendor_id_2, errata_id_2, \ 136 IS_ENABLED(CONFIG_k_2)) 137 138#endif /* __ASSEMBLY__ */ 139 140#else /* CONFIG_RISCV_ALTERNATIVE */ 141#ifdef __ASSEMBLY__ 142 143.macro __ALTERNATIVE_CFG old_c 144 \old_c 145.endm 146 147#define _ALTERNATIVE_CFG(old_c, new_c, vendor_id, errata_id, CONFIG_k) \ 148 __ALTERNATIVE_CFG old_c 149 150#define _ALTERNATIVE_CFG_2(old_c, new_c_1, vendor_id_1, errata_id_1, \ 151 CONFIG_k_1, \ 152 new_c_2, vendor_id_2, errata_id_2, \ 153 CONFIG_k_2) \ 154 __ALTERNATIVE_CFG old_c 155 156#else /* !__ASSEMBLY__ */ 157 158#define __ALTERNATIVE_CFG(old_c) \ 159 old_c "\n" 160 161#define _ALTERNATIVE_CFG(old_c, new_c, vendor_id, errata_id, CONFIG_k) \ 162 __ALTERNATIVE_CFG(old_c) 163 164#define _ALTERNATIVE_CFG_2(old_c, new_c_1, vendor_id_1, errata_id_1, \ 165 CONFIG_k_1, \ 166 new_c_2, vendor_id_2, errata_id_2, \ 167 CONFIG_k_2) \ 168 __ALTERNATIVE_CFG(old_c) 169 170#endif /* __ASSEMBLY__ */ 171#endif /* CONFIG_RISCV_ALTERNATIVE */ 172 173/* 174 * Usage: 175 * ALTERNATIVE(old_content, new_content, vendor_id, errata_id, CONFIG_k) 176 * in the assembly code. Otherwise, 177 * asm(ALTERNATIVE(old_content, new_content, vendor_id, errata_id, CONFIG_k)); 178 * 179 * old_content: The old content which is probably replaced with new content. 180 * new_content: The new content. 181 * vendor_id: The CPU vendor ID. 182 * errata_id: The errata ID. 183 * CONFIG_k: The Kconfig of this errata. When Kconfig is disabled, the old 184 * content will alwyas be executed. 185 */ 186#define ALTERNATIVE(old_content, new_content, vendor_id, errata_id, CONFIG_k) \ 187 _ALTERNATIVE_CFG(old_content, new_content, vendor_id, errata_id, CONFIG_k) 188 189/* 190 * A vendor wants to replace an old_content, but another vendor has used 191 * ALTERNATIVE() to patch its customized content at the same location. In 192 * this case, this vendor can create a new macro ALTERNATIVE_2() based 193 * on the following sample code and then replace ALTERNATIVE() with 194 * ALTERNATIVE_2() to append its customized content. 195 */ 196#define ALTERNATIVE_2(old_content, new_content_1, vendor_id_1, \ 197 errata_id_1, CONFIG_k_1, \ 198 new_content_2, vendor_id_2, \ 199 errata_id_2, CONFIG_k_2) \ 200 _ALTERNATIVE_CFG_2(old_content, new_content_1, vendor_id_1, \ 201 errata_id_1, CONFIG_k_1, \ 202 new_content_2, vendor_id_2, \ 203 errata_id_2, CONFIG_k_2) 204 205#endif