1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __ASM_ALTERNATIVE_MACROS_H 3 #define __ASM_ALTERNATIVE_MACROS_H 4 5 #ifdef CONFIG_RISCV_ERRATA_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 23 888 : 24 \new_c 25 889 : 26 .previous 27 .org . - (889b - 888b) + (887b - 886b) 28 .org . - (887b - 886b) + (889b - 888b) 29 .endif 30 .endm 31 32 .macro __ALTERNATIVE_CFG old_c, new_c, vendor_id, errata_id, enable 33 886 : 34 \old_c 35 887 : 36 ALT_NEW_CONTENT \vendor_id, \errata_id, \enable, \new_c 37 .endm 38 39 #define _ALTERNATIVE_CFG(old_c, new_c, vendor_id, errata_id, CONFIG_k) \ 40 __ALTERNATIVE_CFG old_c, new_c, vendor_id, errata_id, IS_ENABLED(CONFIG_k) 41 42 #else /* !__ASSEMBLY__ */ 43 44 #include <asm/asm.h> 45 #include <linux/stringify.h> 46 47 #define ALT_ENTRY(oldptr, newptr, vendor_id, errata_id, newlen) \ 48 RISCV_PTR " " oldptr "\n" \ 49 RISCV_PTR " " newptr "\n" \ 50 REG_ASM " " vendor_id "\n" \ 51 REG_ASM " " newlen "\n" \ 52 ".word " errata_id "\n" 53 54 #define ALT_NEW_CONSTENT(vendor_id, errata_id, enable, new_c) \ 55 ".if " __stringify(enable) " == 1\n" \ 56 ".pushsection .alternative, \"a\"\n" \ 57 ALT_ENTRY("886b", "888f", __stringify(vendor_id), __stringify(errata_id), "889f - 888f") \ 58 ".popsection\n" \ 59 ".subsection 1\n" \ 60 "888 :\n" \ 61 new_c "\n" \ 62 "889 :\n" \ 63 ".previous\n" \ 64 ".org . - (887b - 886b) + (889b - 888b)\n" \ 65 ".org . - (889b - 888b) + (887b - 886b)\n" \ 66 ".endif\n" 67 68 #define __ALTERNATIVE_CFG(old_c, new_c, vendor_id, errata_id, enable) \ 69 "886 :\n" \ 70 old_c "\n" \ 71 "887 :\n" \ 72 ALT_NEW_CONSTENT(vendor_id, errata_id, enable, new_c) 73 74 #define _ALTERNATIVE_CFG(old_c, new_c, vendor_id, errata_id, CONFIG_k) \ 75 __ALTERNATIVE_CFG(old_c, new_c, vendor_id, errata_id, IS_ENABLED(CONFIG_k)) 76 77 #endif /* __ASSEMBLY__ */ 78 79 #else /* !CONFIG_RISCV_ERRATA_ALTERNATIVE*/ 80 #ifdef __ASSEMBLY__ 81 82 .macro __ALTERNATIVE_CFG old_c 83 \old_c 84 .endm 85 86 #define _ALTERNATIVE_CFG(old_c, new_c, vendor_id, errata_id, CONFIG_k) \ 87 __ALTERNATIVE_CFG old_c 88 89 #else /* !__ASSEMBLY__ */ 90 91 #define __ALTERNATIVE_CFG(old_c) \ 92 old_c "\n" 93 94 #define _ALTERNATIVE_CFG(old_c, new_c, vendor_id, errata_id, CONFIG_k) \ 95 __ALTERNATIVE_CFG(old_c) 96 97 #endif /* __ASSEMBLY__ */ 98 #endif /* CONFIG_RISCV_ERRATA_ALTERNATIVE */ 99 /* 100 * Usage: 101 * ALTERNATIVE(old_content, new_content, vendor_id, errata_id, CONFIG_k) 102 * in the assembly code. Otherwise, 103 * asm(ALTERNATIVE(old_content, new_content, vendor_id, errata_id, CONFIG_k)); 104 * 105 * old_content: The old content which is probably replaced with new content. 106 * new_content: The new content. 107 * vendor_id: The CPU vendor ID. 108 * errata_id: The errata ID. 109 * CONFIG_k: The Kconfig of this errata. When Kconfig is disabled, the old 110 * content will alwyas be executed. 111 */ 112 #define ALTERNATIVE(old_content, new_content, vendor_id, errata_id, CONFIG_k) \ 113 _ALTERNATIVE_CFG(old_content, new_content, vendor_id, errata_id, CONFIG_k) 114 115 /* 116 * A vendor wants to replace an old_content, but another vendor has used 117 * ALTERNATIVE() to patch its customized content at the same location. In 118 * this case, this vendor can create a new macro ALTERNATIVE_2() based 119 * on the following sample code and then replace ALTERNATIVE() with 120 * ALTERNATIVE_2() to append its customized content. 121 * 122 * .macro __ALTERNATIVE_CFG_2 old_c, new_c_1, vendor_id_1, errata_id_1, enable_1, \ 123 * new_c_2, vendor_id_2, errata_id_2, enable_2 124 * 886 : 125 * \old_c 126 * 887 : 127 * ALT_NEW_CONTENT \vendor_id_1, \errata_id_1, \enable_1, \new_c_1 128 * ALT_NEW_CONTENT \vendor_id_2, \errata_id_2, \enable_2, \new_c_2 129 * .endm 130 * 131 * #define _ALTERNATIVE_CFG_2(old_c, new_c_1, vendor_id_1, errata_id_1, CONFIG_k_1, \ 132 * new_c_2, vendor_id_2, errata_id_2, CONFIG_k_2) \ 133 * __ALTERNATIVE_CFG_2 old_c, new_c_1, vendor_id_1, errata_id_1, IS_ENABLED(CONFIG_k_1), \ 134 * new_c_2, vendor_id_2, errata_id_2, IS_ENABLED(CONFIG_k_2) \ 135 * 136 * #define ALTERNATIVE_2(old_content, new_content_1, vendor_id_1, errata_id_1, CONFIG_k_1, \ 137 * new_content_2, vendor_id_2, errata_id_2, CONFIG_k_2) \ 138 * _ALTERNATIVE_CFG_2(old_content, new_content_1, vendor_id_1, errata_id_1, CONFIG_k_1, \ 139 * new_content_2, vendor_id_2, errata_id_2, CONFIG_k_2) 140 * 141 */ 142 #endif 143