1 #ifndef __ASM_POWERPC_FEATURE_FIXUPS_H 2 #define __ASM_POWERPC_FEATURE_FIXUPS_H 3 4 #include <asm/asm-const.h> 5 6 /* 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 10 * 2 of the License, or (at your option) any later version. 11 */ 12 13 /* 14 * Feature section common macros 15 * 16 * Note that the entries now contain offsets between the table entry 17 * and the code rather than absolute code pointers in order to be 18 * useable with the vdso shared library. There is also an assumption 19 * that values will be negative, that is, the fixup table has to be 20 * located after the code it fixes up. 21 */ 22 #if defined(CONFIG_PPC64) && !defined(__powerpc64__) 23 /* 64 bits kernel, 32 bits code (ie. vdso32) */ 24 #define FTR_ENTRY_LONG .8byte 25 #define FTR_ENTRY_OFFSET .long 0xffffffff; .long 26 #elif defined(CONFIG_PPC64) 27 #define FTR_ENTRY_LONG .8byte 28 #define FTR_ENTRY_OFFSET .8byte 29 #else 30 #define FTR_ENTRY_LONG .long 31 #define FTR_ENTRY_OFFSET .long 32 #endif 33 34 #define START_FTR_SECTION(label) label##1: 35 36 #define FTR_SECTION_ELSE_NESTED(label) \ 37 label##2: \ 38 .pushsection __ftr_alt_##label,"a"; \ 39 .align 2; \ 40 label##3: 41 42 #define MAKE_FTR_SECTION_ENTRY(msk, val, label, sect) \ 43 label##4: \ 44 .popsection; \ 45 .pushsection sect,"a"; \ 46 .align 3; \ 47 label##5: \ 48 FTR_ENTRY_LONG msk; \ 49 FTR_ENTRY_LONG val; \ 50 FTR_ENTRY_OFFSET label##1b-label##5b; \ 51 FTR_ENTRY_OFFSET label##2b-label##5b; \ 52 FTR_ENTRY_OFFSET label##3b-label##5b; \ 53 FTR_ENTRY_OFFSET label##4b-label##5b; \ 54 .ifgt (label##4b- label##3b)-(label##2b- label##1b); \ 55 .error "Feature section else case larger than body"; \ 56 .endif; \ 57 .popsection; 58 59 60 /* CPU feature dependent sections */ 61 #define BEGIN_FTR_SECTION_NESTED(label) START_FTR_SECTION(label) 62 #define BEGIN_FTR_SECTION START_FTR_SECTION(97) 63 64 #define END_FTR_SECTION_NESTED(msk, val, label) \ 65 FTR_SECTION_ELSE_NESTED(label) \ 66 MAKE_FTR_SECTION_ENTRY(msk, val, label, __ftr_fixup) 67 68 #define END_FTR_SECTION(msk, val) \ 69 END_FTR_SECTION_NESTED(msk, val, 97) 70 71 #define END_FTR_SECTION_NESTED_IFSET(msk, label) \ 72 END_FTR_SECTION_NESTED((msk), (msk), label) 73 74 #define END_FTR_SECTION_IFSET(msk) END_FTR_SECTION((msk), (msk)) 75 #define END_FTR_SECTION_IFCLR(msk) END_FTR_SECTION((msk), 0) 76 77 /* CPU feature sections with alternatives, use BEGIN_FTR_SECTION to start */ 78 #define FTR_SECTION_ELSE FTR_SECTION_ELSE_NESTED(97) 79 #define ALT_FTR_SECTION_END_NESTED(msk, val, label) \ 80 MAKE_FTR_SECTION_ENTRY(msk, val, label, __ftr_fixup) 81 #define ALT_FTR_SECTION_END_NESTED_IFSET(msk, label) \ 82 ALT_FTR_SECTION_END_NESTED(msk, msk, label) 83 #define ALT_FTR_SECTION_END_NESTED_IFCLR(msk, label) \ 84 ALT_FTR_SECTION_END_NESTED(msk, 0, label) 85 #define ALT_FTR_SECTION_END(msk, val) \ 86 ALT_FTR_SECTION_END_NESTED(msk, val, 97) 87 #define ALT_FTR_SECTION_END_IFSET(msk) \ 88 ALT_FTR_SECTION_END_NESTED_IFSET(msk, 97) 89 #define ALT_FTR_SECTION_END_IFCLR(msk) \ 90 ALT_FTR_SECTION_END_NESTED_IFCLR(msk, 97) 91 92 /* MMU feature dependent sections */ 93 #define BEGIN_MMU_FTR_SECTION_NESTED(label) START_FTR_SECTION(label) 94 #define BEGIN_MMU_FTR_SECTION START_FTR_SECTION(97) 95 96 #define END_MMU_FTR_SECTION_NESTED(msk, val, label) \ 97 FTR_SECTION_ELSE_NESTED(label) \ 98 MAKE_FTR_SECTION_ENTRY(msk, val, label, __mmu_ftr_fixup) 99 100 #define END_MMU_FTR_SECTION(msk, val) \ 101 END_MMU_FTR_SECTION_NESTED(msk, val, 97) 102 103 #define END_MMU_FTR_SECTION_IFSET(msk) END_MMU_FTR_SECTION((msk), (msk)) 104 #define END_MMU_FTR_SECTION_IFCLR(msk) END_MMU_FTR_SECTION((msk), 0) 105 106 /* MMU feature sections with alternatives, use BEGIN_FTR_SECTION to start */ 107 #define MMU_FTR_SECTION_ELSE_NESTED(label) FTR_SECTION_ELSE_NESTED(label) 108 #define MMU_FTR_SECTION_ELSE MMU_FTR_SECTION_ELSE_NESTED(97) 109 #define ALT_MMU_FTR_SECTION_END_NESTED(msk, val, label) \ 110 MAKE_FTR_SECTION_ENTRY(msk, val, label, __mmu_ftr_fixup) 111 #define ALT_MMU_FTR_SECTION_END_NESTED_IFSET(msk, label) \ 112 ALT_MMU_FTR_SECTION_END_NESTED(msk, msk, label) 113 #define ALT_MMU_FTR_SECTION_END_NESTED_IFCLR(msk, label) \ 114 ALT_MMU_FTR_SECTION_END_NESTED(msk, 0, label) 115 #define ALT_MMU_FTR_SECTION_END(msk, val) \ 116 ALT_MMU_FTR_SECTION_END_NESTED(msk, val, 97) 117 #define ALT_MMU_FTR_SECTION_END_IFSET(msk) \ 118 ALT_MMU_FTR_SECTION_END_NESTED_IFSET(msk, 97) 119 #define ALT_MMU_FTR_SECTION_END_IFCLR(msk) \ 120 ALT_MMU_FTR_SECTION_END_NESTED_IFCLR(msk, 97) 121 122 /* Firmware feature dependent sections */ 123 #define BEGIN_FW_FTR_SECTION_NESTED(label) START_FTR_SECTION(label) 124 #define BEGIN_FW_FTR_SECTION START_FTR_SECTION(97) 125 126 #define END_FW_FTR_SECTION_NESTED(msk, val, label) \ 127 FTR_SECTION_ELSE_NESTED(label) \ 128 MAKE_FTR_SECTION_ENTRY(msk, val, label, __fw_ftr_fixup) 129 130 #define END_FW_FTR_SECTION(msk, val) \ 131 END_FW_FTR_SECTION_NESTED(msk, val, 97) 132 133 #define END_FW_FTR_SECTION_IFSET(msk) END_FW_FTR_SECTION((msk), (msk)) 134 #define END_FW_FTR_SECTION_IFCLR(msk) END_FW_FTR_SECTION((msk), 0) 135 136 /* Firmware feature sections with alternatives */ 137 #define FW_FTR_SECTION_ELSE_NESTED(label) FTR_SECTION_ELSE_NESTED(label) 138 #define FW_FTR_SECTION_ELSE FTR_SECTION_ELSE_NESTED(97) 139 #define ALT_FW_FTR_SECTION_END_NESTED(msk, val, label) \ 140 MAKE_FTR_SECTION_ENTRY(msk, val, label, __fw_ftr_fixup) 141 #define ALT_FW_FTR_SECTION_END_NESTED_IFSET(msk, label) \ 142 ALT_FW_FTR_SECTION_END_NESTED(msk, msk, label) 143 #define ALT_FW_FTR_SECTION_END_NESTED_IFCLR(msk, label) \ 144 ALT_FW_FTR_SECTION_END_NESTED(msk, 0, label) 145 #define ALT_FW_FTR_SECTION_END(msk, val) \ 146 ALT_FW_FTR_SECTION_END_NESTED(msk, val, 97) 147 #define ALT_FW_FTR_SECTION_END_IFSET(msk) \ 148 ALT_FW_FTR_SECTION_END_NESTED_IFSET(msk, 97) 149 #define ALT_FW_FTR_SECTION_END_IFCLR(msk) \ 150 ALT_FW_FTR_SECTION_END_NESTED_IFCLR(msk, 97) 151 152 #ifndef __ASSEMBLY__ 153 154 #define ASM_FTR_IF(section_if, section_else, msk, val) \ 155 stringify_in_c(BEGIN_FTR_SECTION) \ 156 section_if "; " \ 157 stringify_in_c(FTR_SECTION_ELSE) \ 158 section_else "; " \ 159 stringify_in_c(ALT_FTR_SECTION_END((msk), (val))) 160 161 #define ASM_FTR_IFSET(section_if, section_else, msk) \ 162 ASM_FTR_IF(section_if, section_else, (msk), (msk)) 163 164 #define ASM_FTR_IFCLR(section_if, section_else, msk) \ 165 ASM_FTR_IF(section_if, section_else, (msk), 0) 166 167 #define ASM_MMU_FTR_IF(section_if, section_else, msk, val) \ 168 stringify_in_c(BEGIN_MMU_FTR_SECTION) \ 169 section_if "; " \ 170 stringify_in_c(MMU_FTR_SECTION_ELSE) \ 171 section_else "; " \ 172 stringify_in_c(ALT_MMU_FTR_SECTION_END((msk), (val))) 173 174 #define ASM_MMU_FTR_IFSET(section_if, section_else, msk) \ 175 ASM_MMU_FTR_IF(section_if, section_else, (msk), (msk)) 176 177 #define ASM_MMU_FTR_IFCLR(section_if, section_else, msk) \ 178 ASM_MMU_FTR_IF(section_if, section_else, (msk), 0) 179 180 #endif /* __ASSEMBLY__ */ 181 182 /* LWSYNC feature sections */ 183 #define START_LWSYNC_SECTION(label) label##1: 184 #define MAKE_LWSYNC_SECTION_ENTRY(label, sect) \ 185 label##2: \ 186 .pushsection sect,"a"; \ 187 .align 2; \ 188 label##3: \ 189 FTR_ENTRY_OFFSET label##1b-label##3b; \ 190 .popsection; 191 192 #define STF_ENTRY_BARRIER_FIXUP_SECTION \ 193 953: \ 194 .pushsection __stf_entry_barrier_fixup,"a"; \ 195 .align 2; \ 196 954: \ 197 FTR_ENTRY_OFFSET 953b-954b; \ 198 .popsection; 199 200 #define STF_EXIT_BARRIER_FIXUP_SECTION \ 201 955: \ 202 .pushsection __stf_exit_barrier_fixup,"a"; \ 203 .align 2; \ 204 956: \ 205 FTR_ENTRY_OFFSET 955b-956b; \ 206 .popsection; 207 208 #define RFI_FLUSH_FIXUP_SECTION \ 209 951: \ 210 .pushsection __rfi_flush_fixup,"a"; \ 211 .align 2; \ 212 952: \ 213 FTR_ENTRY_OFFSET 951b-952b; \ 214 .popsection; 215 216 #define NOSPEC_BARRIER_FIXUP_SECTION \ 217 953: \ 218 .pushsection __barrier_nospec_fixup,"a"; \ 219 .align 2; \ 220 954: \ 221 FTR_ENTRY_OFFSET 953b-954b; \ 222 .popsection; 223 224 225 #ifndef __ASSEMBLY__ 226 #include <linux/types.h> 227 228 extern long stf_barrier_fallback; 229 extern long __start___stf_entry_barrier_fixup, __stop___stf_entry_barrier_fixup; 230 extern long __start___stf_exit_barrier_fixup, __stop___stf_exit_barrier_fixup; 231 extern long __start___rfi_flush_fixup, __stop___rfi_flush_fixup; 232 extern long __start___barrier_nospec_fixup, __stop___barrier_nospec_fixup; 233 234 void apply_feature_fixups(void); 235 void setup_feature_keys(void); 236 #endif 237 238 #endif /* __ASM_POWERPC_FEATURE_FIXUPS_H */ 239