1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 #ifndef __ASM_POWERPC_FEATURE_FIXUPS_H 3 #define __ASM_POWERPC_FEATURE_FIXUPS_H 4 5 #include <asm/asm-const.h> 6 7 /* 8 */ 9 10 /* 11 * Feature section common macros 12 * 13 * Note that the entries now contain offsets between the table entry 14 * and the code rather than absolute code pointers in order to be 15 * useable with the vdso shared library. There is also an assumption 16 * that values will be negative, that is, the fixup table has to be 17 * located after the code it fixes up. 18 */ 19 #if defined(CONFIG_PPC64) && !defined(__powerpc64__) 20 /* 64 bits kernel, 32 bits code (ie. vdso32) */ 21 #define FTR_ENTRY_LONG .8byte 22 #define FTR_ENTRY_OFFSET .long 0xffffffff; .long 23 #elif defined(CONFIG_PPC64) 24 #define FTR_ENTRY_LONG .8byte 25 #define FTR_ENTRY_OFFSET .8byte 26 #else 27 #define FTR_ENTRY_LONG .long 28 #define FTR_ENTRY_OFFSET .long 29 #endif 30 31 #define START_FTR_SECTION(label) label##1: 32 33 #define FTR_SECTION_ELSE_NESTED(label) \ 34 label##2: \ 35 .pushsection __ftr_alt_##label,"a"; \ 36 .align 2; \ 37 label##3: 38 39 40 #ifndef CONFIG_CC_IS_CLANG 41 #define CHECK_ALT_SIZE(else_size, body_size) \ 42 .ifgt (else_size) - (body_size); \ 43 .error "Feature section else case larger than body"; \ 44 .endif; 45 #else 46 /* 47 * If we use the ifgt syntax above, clang's assembler complains about the 48 * expression being non-absolute when the code appears in an inline assembly 49 * statement. 50 * As a workaround use an .org directive that has no effect if the else case 51 * instructions are smaller than the body, but fails otherwise. 52 */ 53 #define CHECK_ALT_SIZE(else_size, body_size) \ 54 .org . + ((else_size) > (body_size)); 55 #endif 56 57 #define MAKE_FTR_SECTION_ENTRY(msk, val, label, sect) \ 58 label##4: \ 59 .popsection; \ 60 .pushsection sect,"a"; \ 61 .align 3; \ 62 label##5: \ 63 FTR_ENTRY_LONG msk; \ 64 FTR_ENTRY_LONG val; \ 65 FTR_ENTRY_OFFSET label##1b-label##5b; \ 66 FTR_ENTRY_OFFSET label##2b-label##5b; \ 67 FTR_ENTRY_OFFSET label##3b-label##5b; \ 68 FTR_ENTRY_OFFSET label##4b-label##5b; \ 69 CHECK_ALT_SIZE((label##4b-label##3b), (label##2b-label##1b)); \ 70 .popsection; 71 72 73 /* CPU feature dependent sections */ 74 #define BEGIN_FTR_SECTION_NESTED(label) START_FTR_SECTION(label) 75 #define BEGIN_FTR_SECTION START_FTR_SECTION(97) 76 77 #define END_FTR_SECTION_NESTED(msk, val, label) \ 78 FTR_SECTION_ELSE_NESTED(label) \ 79 MAKE_FTR_SECTION_ENTRY(msk, val, label, __ftr_fixup) 80 81 #define END_FTR_SECTION(msk, val) \ 82 END_FTR_SECTION_NESTED(msk, val, 97) 83 84 #define END_FTR_SECTION_NESTED_IFSET(msk, label) \ 85 END_FTR_SECTION_NESTED((msk), (msk), label) 86 87 #define END_FTR_SECTION_IFSET(msk) END_FTR_SECTION((msk), (msk)) 88 #define END_FTR_SECTION_IFCLR(msk) END_FTR_SECTION((msk), 0) 89 90 /* CPU feature sections with alternatives, use BEGIN_FTR_SECTION to start */ 91 #define FTR_SECTION_ELSE FTR_SECTION_ELSE_NESTED(97) 92 #define ALT_FTR_SECTION_END_NESTED(msk, val, label) \ 93 MAKE_FTR_SECTION_ENTRY(msk, val, label, __ftr_fixup) 94 #define ALT_FTR_SECTION_END_NESTED_IFSET(msk, label) \ 95 ALT_FTR_SECTION_END_NESTED(msk, msk, label) 96 #define ALT_FTR_SECTION_END_NESTED_IFCLR(msk, label) \ 97 ALT_FTR_SECTION_END_NESTED(msk, 0, label) 98 #define ALT_FTR_SECTION_END(msk, val) \ 99 ALT_FTR_SECTION_END_NESTED(msk, val, 97) 100 #define ALT_FTR_SECTION_END_IFSET(msk) \ 101 ALT_FTR_SECTION_END_NESTED_IFSET(msk, 97) 102 #define ALT_FTR_SECTION_END_IFCLR(msk) \ 103 ALT_FTR_SECTION_END_NESTED_IFCLR(msk, 97) 104 105 /* MMU feature dependent sections */ 106 #define BEGIN_MMU_FTR_SECTION_NESTED(label) START_FTR_SECTION(label) 107 #define BEGIN_MMU_FTR_SECTION START_FTR_SECTION(97) 108 109 #define END_MMU_FTR_SECTION_NESTED(msk, val, label) \ 110 FTR_SECTION_ELSE_NESTED(label) \ 111 MAKE_FTR_SECTION_ENTRY(msk, val, label, __mmu_ftr_fixup) 112 113 #define END_MMU_FTR_SECTION(msk, val) \ 114 END_MMU_FTR_SECTION_NESTED(msk, val, 97) 115 116 #define END_MMU_FTR_SECTION_NESTED_IFSET(msk, label) \ 117 END_MMU_FTR_SECTION_NESTED((msk), (msk), label) 118 119 #define END_MMU_FTR_SECTION_NESTED_IFCLR(msk, label) \ 120 END_MMU_FTR_SECTION_NESTED((msk), 0, label) 121 122 #define END_MMU_FTR_SECTION_IFSET(msk) END_MMU_FTR_SECTION((msk), (msk)) 123 #define END_MMU_FTR_SECTION_IFCLR(msk) END_MMU_FTR_SECTION((msk), 0) 124 125 /* MMU feature sections with alternatives, use BEGIN_FTR_SECTION to start */ 126 #define MMU_FTR_SECTION_ELSE_NESTED(label) FTR_SECTION_ELSE_NESTED(label) 127 #define MMU_FTR_SECTION_ELSE MMU_FTR_SECTION_ELSE_NESTED(97) 128 #define ALT_MMU_FTR_SECTION_END_NESTED(msk, val, label) \ 129 MAKE_FTR_SECTION_ENTRY(msk, val, label, __mmu_ftr_fixup) 130 #define ALT_MMU_FTR_SECTION_END_NESTED_IFSET(msk, label) \ 131 ALT_MMU_FTR_SECTION_END_NESTED(msk, msk, label) 132 #define ALT_MMU_FTR_SECTION_END_NESTED_IFCLR(msk, label) \ 133 ALT_MMU_FTR_SECTION_END_NESTED(msk, 0, label) 134 #define ALT_MMU_FTR_SECTION_END(msk, val) \ 135 ALT_MMU_FTR_SECTION_END_NESTED(msk, val, 97) 136 #define ALT_MMU_FTR_SECTION_END_IFSET(msk) \ 137 ALT_MMU_FTR_SECTION_END_NESTED_IFSET(msk, 97) 138 #define ALT_MMU_FTR_SECTION_END_IFCLR(msk) \ 139 ALT_MMU_FTR_SECTION_END_NESTED_IFCLR(msk, 97) 140 141 /* Firmware feature dependent sections */ 142 #define BEGIN_FW_FTR_SECTION_NESTED(label) START_FTR_SECTION(label) 143 #define BEGIN_FW_FTR_SECTION START_FTR_SECTION(97) 144 145 #define END_FW_FTR_SECTION_NESTED(msk, val, label) \ 146 FTR_SECTION_ELSE_NESTED(label) \ 147 MAKE_FTR_SECTION_ENTRY(msk, val, label, __fw_ftr_fixup) 148 149 #define END_FW_FTR_SECTION(msk, val) \ 150 END_FW_FTR_SECTION_NESTED(msk, val, 97) 151 152 #define END_FW_FTR_SECTION_IFSET(msk) END_FW_FTR_SECTION((msk), (msk)) 153 #define END_FW_FTR_SECTION_IFCLR(msk) END_FW_FTR_SECTION((msk), 0) 154 155 /* Firmware feature sections with alternatives */ 156 #define FW_FTR_SECTION_ELSE_NESTED(label) FTR_SECTION_ELSE_NESTED(label) 157 #define FW_FTR_SECTION_ELSE FTR_SECTION_ELSE_NESTED(97) 158 #define ALT_FW_FTR_SECTION_END_NESTED(msk, val, label) \ 159 MAKE_FTR_SECTION_ENTRY(msk, val, label, __fw_ftr_fixup) 160 #define ALT_FW_FTR_SECTION_END_NESTED_IFSET(msk, label) \ 161 ALT_FW_FTR_SECTION_END_NESTED(msk, msk, label) 162 #define ALT_FW_FTR_SECTION_END_NESTED_IFCLR(msk, label) \ 163 ALT_FW_FTR_SECTION_END_NESTED(msk, 0, label) 164 #define ALT_FW_FTR_SECTION_END(msk, val) \ 165 ALT_FW_FTR_SECTION_END_NESTED(msk, val, 97) 166 #define ALT_FW_FTR_SECTION_END_IFSET(msk) \ 167 ALT_FW_FTR_SECTION_END_NESTED_IFSET(msk, 97) 168 #define ALT_FW_FTR_SECTION_END_IFCLR(msk) \ 169 ALT_FW_FTR_SECTION_END_NESTED_IFCLR(msk, 97) 170 171 #ifndef __ASSEMBLY__ 172 173 #define ASM_FTR_IF(section_if, section_else, msk, val) \ 174 stringify_in_c(BEGIN_FTR_SECTION) \ 175 section_if "; " \ 176 stringify_in_c(FTR_SECTION_ELSE) \ 177 section_else "; " \ 178 stringify_in_c(ALT_FTR_SECTION_END((msk), (val))) 179 180 #define ASM_FTR_IFSET(section_if, section_else, msk) \ 181 ASM_FTR_IF(section_if, section_else, (msk), (msk)) 182 183 #define ASM_FTR_IFCLR(section_if, section_else, msk) \ 184 ASM_FTR_IF(section_if, section_else, (msk), 0) 185 186 #define ASM_MMU_FTR_IF(section_if, section_else, msk, val) \ 187 stringify_in_c(BEGIN_MMU_FTR_SECTION) \ 188 section_if "; " \ 189 stringify_in_c(MMU_FTR_SECTION_ELSE) \ 190 section_else "; " \ 191 stringify_in_c(ALT_MMU_FTR_SECTION_END((msk), (val))) 192 193 #define ASM_MMU_FTR_IFSET(section_if, section_else, msk) \ 194 ASM_MMU_FTR_IF(section_if, section_else, (msk), (msk)) 195 196 #define ASM_MMU_FTR_IFCLR(section_if, section_else, msk) \ 197 ASM_MMU_FTR_IF(section_if, section_else, (msk), 0) 198 199 #endif /* __ASSEMBLY__ */ 200 201 /* LWSYNC feature sections */ 202 #define START_LWSYNC_SECTION(label) label##1: 203 #define MAKE_LWSYNC_SECTION_ENTRY(label, sect) \ 204 label##2: \ 205 .pushsection sect,"a"; \ 206 .align 2; \ 207 label##3: \ 208 FTR_ENTRY_OFFSET label##1b-label##3b; \ 209 .popsection; 210 211 #define STF_ENTRY_BARRIER_FIXUP_SECTION \ 212 953: \ 213 .pushsection __stf_entry_barrier_fixup,"a"; \ 214 .align 2; \ 215 954: \ 216 FTR_ENTRY_OFFSET 953b-954b; \ 217 .popsection; 218 219 #define STF_EXIT_BARRIER_FIXUP_SECTION \ 220 955: \ 221 .pushsection __stf_exit_barrier_fixup,"a"; \ 222 .align 2; \ 223 956: \ 224 FTR_ENTRY_OFFSET 955b-956b; \ 225 .popsection; 226 227 #define UACCESS_FLUSH_FIXUP_SECTION \ 228 959: \ 229 .pushsection __uaccess_flush_fixup,"a"; \ 230 .align 2; \ 231 960: \ 232 FTR_ENTRY_OFFSET 959b-960b; \ 233 .popsection; 234 235 #define ENTRY_FLUSH_FIXUP_SECTION \ 236 957: \ 237 .pushsection __entry_flush_fixup,"a"; \ 238 .align 2; \ 239 958: \ 240 FTR_ENTRY_OFFSET 957b-958b; \ 241 .popsection; 242 243 #define SCV_ENTRY_FLUSH_FIXUP_SECTION \ 244 957: \ 245 .pushsection __scv_entry_flush_fixup,"a"; \ 246 .align 2; \ 247 958: \ 248 FTR_ENTRY_OFFSET 957b-958b; \ 249 .popsection; 250 251 #define RFI_FLUSH_FIXUP_SECTION \ 252 951: \ 253 .pushsection __rfi_flush_fixup,"a"; \ 254 .align 2; \ 255 952: \ 256 FTR_ENTRY_OFFSET 951b-952b; \ 257 .popsection; 258 259 #define NOSPEC_BARRIER_FIXUP_SECTION \ 260 953: \ 261 .pushsection __barrier_nospec_fixup,"a"; \ 262 .align 2; \ 263 954: \ 264 FTR_ENTRY_OFFSET 953b-954b; \ 265 .popsection; 266 267 #define START_BTB_FLUSH_SECTION \ 268 955: \ 269 270 #define END_BTB_FLUSH_SECTION \ 271 956: \ 272 .pushsection __btb_flush_fixup,"a"; \ 273 .align 2; \ 274 957: \ 275 FTR_ENTRY_OFFSET 955b-957b; \ 276 FTR_ENTRY_OFFSET 956b-957b; \ 277 .popsection; 278 279 #ifndef __ASSEMBLY__ 280 #include <linux/types.h> 281 282 extern long stf_barrier_fallback; 283 extern long entry_flush_fallback; 284 extern long scv_entry_flush_fallback; 285 extern long __start___stf_entry_barrier_fixup, __stop___stf_entry_barrier_fixup; 286 extern long __start___stf_exit_barrier_fixup, __stop___stf_exit_barrier_fixup; 287 extern long __start___uaccess_flush_fixup, __stop___uaccess_flush_fixup; 288 extern long __start___entry_flush_fixup, __stop___entry_flush_fixup; 289 extern long __start___scv_entry_flush_fixup, __stop___scv_entry_flush_fixup; 290 extern long __start___rfi_flush_fixup, __stop___rfi_flush_fixup; 291 extern long __start___barrier_nospec_fixup, __stop___barrier_nospec_fixup; 292 extern long __start__btb_flush_fixup, __stop__btb_flush_fixup; 293 294 void apply_feature_fixups(void); 295 void setup_feature_keys(void); 296 #endif 297 298 #endif /* __ASM_POWERPC_FEATURE_FIXUPS_H */ 299