1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * We need constants.h for: 4 * VMA_VM_MM 5 * VMA_VM_FLAGS 6 * VM_EXEC 7 */ 8 #include <asm/asm-offsets.h> 9 #include <asm/pgtable.h> 10 #include <asm/thread_info.h> 11 12 #ifdef CONFIG_CPU_V7M 13 #include <asm/v7m.h> 14 #endif 15 16 /* 17 * vma_vm_mm - get mm pointer from vma pointer (vma->vm_mm) 18 */ 19 .macro vma_vm_mm, rd, rn 20 ldr \rd, [\rn, #VMA_VM_MM] 21 .endm 22 23 /* 24 * vma_vm_flags - get vma->vm_flags 25 */ 26 .macro vma_vm_flags, rd, rn 27 ldr \rd, [\rn, #VMA_VM_FLAGS] 28 .endm 29 30 /* 31 * act_mm - get current->active_mm 32 */ 33 .macro act_mm, rd 34 get_current \rd 35 .if (TSK_ACTIVE_MM > IMM12_MASK) 36 add \rd, \rd, #TSK_ACTIVE_MM & ~IMM12_MASK 37 .endif 38 ldr \rd, [\rd, #TSK_ACTIVE_MM & IMM12_MASK] 39 .endm 40 41 /* 42 * mmid - get context id from mm pointer (mm->context.id) 43 * note, this field is 64bit, so in big-endian the two words are swapped too. 44 */ 45 .macro mmid, rd, rn 46 #ifdef __ARMEB__ 47 ldr \rd, [\rn, #MM_CONTEXT_ID + 4 ] 48 #else 49 ldr \rd, [\rn, #MM_CONTEXT_ID] 50 #endif 51 .endm 52 53 /* 54 * mask_asid - mask the ASID from the context ID 55 */ 56 .macro asid, rd, rn 57 and \rd, \rn, #255 58 .endm 59 60 .macro crval, clear, mmuset, ucset 61 #ifdef CONFIG_MMU 62 .word \clear 63 .word \mmuset 64 #else 65 .word \clear 66 .word \ucset 67 #endif 68 .endm 69 70 /* 71 * dcache_line_size - get the minimum D-cache line size from the CTR register 72 * on ARMv7. 73 */ 74 .macro dcache_line_size, reg, tmp 75 #ifdef CONFIG_CPU_V7M 76 movw \tmp, #:lower16:BASEADDR_V7M_SCB + V7M_SCB_CTR 77 movt \tmp, #:upper16:BASEADDR_V7M_SCB + V7M_SCB_CTR 78 ldr \tmp, [\tmp] 79 #else 80 mrc p15, 0, \tmp, c0, c0, 1 @ read ctr 81 #endif 82 lsr \tmp, \tmp, #16 83 and \tmp, \tmp, #0xf @ cache line size encoding 84 mov \reg, #4 @ bytes per word 85 mov \reg, \reg, lsl \tmp @ actual cache line size 86 .endm 87 88 /* 89 * icache_line_size - get the minimum I-cache line size from the CTR register 90 * on ARMv7. 91 */ 92 .macro icache_line_size, reg, tmp 93 #ifdef CONFIG_CPU_V7M 94 movw \tmp, #:lower16:BASEADDR_V7M_SCB + V7M_SCB_CTR 95 movt \tmp, #:upper16:BASEADDR_V7M_SCB + V7M_SCB_CTR 96 ldr \tmp, [\tmp] 97 #else 98 mrc p15, 0, \tmp, c0, c0, 1 @ read ctr 99 #endif 100 and \tmp, \tmp, #0xf @ cache line size encoding 101 mov \reg, #4 @ bytes per word 102 mov \reg, \reg, lsl \tmp @ actual cache line size 103 .endm 104 105 /* 106 * Sanity check the PTE configuration for the code below - which makes 107 * certain assumptions about how these bits are laid out. 108 */ 109 #ifdef CONFIG_MMU 110 #if L_PTE_SHARED != PTE_EXT_SHARED 111 #error PTE shared bit mismatch 112 #endif 113 #if !defined (CONFIG_ARM_LPAE) && \ 114 (L_PTE_XN+L_PTE_USER+L_PTE_RDONLY+L_PTE_DIRTY+L_PTE_YOUNG+\ 115 L_PTE_PRESENT) > L_PTE_SHARED 116 #error Invalid Linux PTE bit settings 117 #endif 118 #endif /* CONFIG_MMU */ 119 120 /* 121 * The ARMv6 and ARMv7 set_pte_ext translation function. 122 * 123 * Permission translation: 124 * YUWD APX AP1 AP0 SVC User 125 * 0xxx 0 0 0 no acc no acc 126 * 100x 1 0 1 r/o no acc 127 * 10x0 1 0 1 r/o no acc 128 * 1011 0 0 1 r/w no acc 129 * 110x 1 1 1 r/o r/o 130 * 11x0 1 1 1 r/o r/o 131 * 1111 0 1 1 r/w r/w 132 */ 133 .macro armv6_mt_table pfx 134 \pfx\()_mt_table: 135 .long 0x00 @ L_PTE_MT_UNCACHED 136 .long PTE_EXT_TEX(1) @ L_PTE_MT_BUFFERABLE 137 .long PTE_CACHEABLE @ L_PTE_MT_WRITETHROUGH 138 .long PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_WRITEBACK 139 .long PTE_BUFFERABLE @ L_PTE_MT_DEV_SHARED 140 .long 0x00 @ unused 141 .long 0x00 @ L_PTE_MT_MINICACHE (not present) 142 .long PTE_EXT_TEX(1) | PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_WRITEALLOC 143 .long 0x00 @ unused 144 .long PTE_EXT_TEX(1) @ L_PTE_MT_DEV_WC 145 .long 0x00 @ unused 146 .long PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_DEV_CACHED 147 .long PTE_EXT_TEX(2) @ L_PTE_MT_DEV_NONSHARED 148 .long 0x00 @ unused 149 .long 0x00 @ unused 150 .long PTE_CACHEABLE | PTE_BUFFERABLE | PTE_EXT_APX @ L_PTE_MT_VECTORS 151 .endm 152 153 .macro armv6_set_pte_ext pfx 154 str r1, [r0], #2048 @ linux version 155 156 bic r3, r1, #0x000003fc 157 bic r3, r3, #PTE_TYPE_MASK 158 orr r3, r3, r2 159 orr r3, r3, #PTE_EXT_AP0 | 2 160 161 adr ip, \pfx\()_mt_table 162 and r2, r1, #L_PTE_MT_MASK 163 ldr r2, [ip, r2] 164 165 eor r1, r1, #L_PTE_DIRTY 166 tst r1, #L_PTE_DIRTY|L_PTE_RDONLY 167 orrne r3, r3, #PTE_EXT_APX 168 169 tst r1, #L_PTE_USER 170 orrne r3, r3, #PTE_EXT_AP1 171 tstne r3, #PTE_EXT_APX 172 173 @ user read-only -> kernel read-only 174 bicne r3, r3, #PTE_EXT_AP0 175 176 tst r1, #L_PTE_XN 177 orrne r3, r3, #PTE_EXT_XN 178 179 eor r3, r3, r2 180 181 tst r1, #L_PTE_YOUNG 182 tstne r1, #L_PTE_PRESENT 183 moveq r3, #0 184 tstne r1, #L_PTE_NONE 185 movne r3, #0 186 187 str r3, [r0] 188 mcr p15, 0, r0, c7, c10, 1 @ flush_pte 189 .endm 190 191 192 /* 193 * The ARMv3, ARMv4 and ARMv5 set_pte_ext translation function, 194 * covering most CPUs except Xscale and Xscale 3. 195 * 196 * Permission translation: 197 * YUWD AP SVC User 198 * 0xxx 0x00 no acc no acc 199 * 100x 0x00 r/o no acc 200 * 10x0 0x00 r/o no acc 201 * 1011 0x55 r/w no acc 202 * 110x 0xaa r/w r/o 203 * 11x0 0xaa r/w r/o 204 * 1111 0xff r/w r/w 205 */ 206 .macro armv3_set_pte_ext wc_disable=1 207 str r1, [r0], #2048 @ linux version 208 209 eor r3, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY 210 211 bic r2, r1, #PTE_SMALL_AP_MASK @ keep C, B bits 212 bic r2, r2, #PTE_TYPE_MASK 213 orr r2, r2, #PTE_TYPE_SMALL 214 215 tst r3, #L_PTE_USER @ user? 216 orrne r2, r2, #PTE_SMALL_AP_URO_SRW 217 218 tst r3, #L_PTE_RDONLY | L_PTE_DIRTY @ write and dirty? 219 orreq r2, r2, #PTE_SMALL_AP_UNO_SRW 220 221 tst r3, #L_PTE_PRESENT | L_PTE_YOUNG @ present and young? 222 movne r2, #0 223 224 .if \wc_disable 225 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH 226 tst r2, #PTE_CACHEABLE 227 bicne r2, r2, #PTE_BUFFERABLE 228 #endif 229 .endif 230 str r2, [r0] @ hardware version 231 .endm 232 233 234 /* 235 * Xscale set_pte_ext translation, split into two halves to cope 236 * with work-arounds. r3 must be preserved by code between these 237 * two macros. 238 * 239 * Permission translation: 240 * YUWD AP SVC User 241 * 0xxx 00 no acc no acc 242 * 100x 00 r/o no acc 243 * 10x0 00 r/o no acc 244 * 1011 01 r/w no acc 245 * 110x 10 r/w r/o 246 * 11x0 10 r/w r/o 247 * 1111 11 r/w r/w 248 */ 249 .macro xscale_set_pte_ext_prologue 250 str r1, [r0] @ linux version 251 252 eor r3, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY 253 254 bic r2, r1, #PTE_SMALL_AP_MASK @ keep C, B bits 255 orr r2, r2, #PTE_TYPE_EXT @ extended page 256 257 tst r3, #L_PTE_USER @ user? 258 orrne r2, r2, #PTE_EXT_AP_URO_SRW @ yes -> user r/o, system r/w 259 260 tst r3, #L_PTE_RDONLY | L_PTE_DIRTY @ write and dirty? 261 orreq r2, r2, #PTE_EXT_AP_UNO_SRW @ yes -> user n/a, system r/w 262 @ combined with user -> user r/w 263 .endm 264 265 .macro xscale_set_pte_ext_epilogue 266 tst r3, #L_PTE_PRESENT | L_PTE_YOUNG @ present and young? 267 movne r2, #0 @ no -> fault 268 269 str r2, [r0, #2048]! @ hardware version 270 mov ip, #0 271 mcr p15, 0, r0, c7, c10, 1 @ clean L1 D line 272 mcr p15, 0, ip, c7, c10, 4 @ data write barrier 273 .endm 274 275 .macro define_processor_functions name:req, dabort:req, pabort:req, nommu=0, suspend=0, bugs=0 276 /* 277 * If we are building for big.Little with branch predictor hardening, 278 * we need the processor function tables to remain available after boot. 279 */ 280 #if defined(CONFIG_BIG_LITTLE) && defined(CONFIG_HARDEN_BRANCH_PREDICTOR) 281 .section ".rodata" 282 #endif 283 .type \name\()_processor_functions, #object 284 .align 2 285 ENTRY(\name\()_processor_functions) 286 .word \dabort 287 .word \pabort 288 .word cpu_\name\()_proc_init 289 .word \bugs 290 .word cpu_\name\()_proc_fin 291 .word cpu_\name\()_reset 292 .word cpu_\name\()_do_idle 293 .word cpu_\name\()_dcache_clean_area 294 .word cpu_\name\()_switch_mm 295 296 .if \nommu 297 .word 0 298 .else 299 .word cpu_\name\()_set_pte_ext 300 .endif 301 302 .if \suspend 303 .word cpu_\name\()_suspend_size 304 #ifdef CONFIG_ARM_CPU_SUSPEND 305 .word cpu_\name\()_do_suspend 306 .word cpu_\name\()_do_resume 307 #else 308 .word 0 309 .word 0 310 #endif 311 .else 312 .word 0 313 .word 0 314 .word 0 315 .endif 316 317 .size \name\()_processor_functions, . - \name\()_processor_functions 318 #if defined(CONFIG_BIG_LITTLE) && defined(CONFIG_HARDEN_BRANCH_PREDICTOR) 319 .previous 320 #endif 321 .endm 322 323 .macro define_cache_functions name:req 324 .align 2 325 .type \name\()_cache_fns, #object 326 ENTRY(\name\()_cache_fns) 327 .long \name\()_flush_icache_all 328 .long \name\()_flush_kern_cache_all 329 .long \name\()_flush_kern_cache_louis 330 .long \name\()_flush_user_cache_all 331 .long \name\()_flush_user_cache_range 332 .long \name\()_coherent_kern_range 333 .long \name\()_coherent_user_range 334 .long \name\()_flush_kern_dcache_area 335 .long \name\()_dma_map_area 336 .long \name\()_dma_unmap_area 337 .long \name\()_dma_flush_range 338 .size \name\()_cache_fns, . - \name\()_cache_fns 339 .endm 340 341 .macro define_tlb_functions name:req, flags_up:req, flags_smp 342 .type \name\()_tlb_fns, #object 343 .align 2 344 ENTRY(\name\()_tlb_fns) 345 .long \name\()_flush_user_tlb_range 346 .long \name\()_flush_kern_tlb_range 347 .ifnb \flags_smp 348 ALT_SMP(.long \flags_smp ) 349 ALT_UP(.long \flags_up ) 350 .else 351 .long \flags_up 352 .endif 353 .size \name\()_tlb_fns, . - \name\()_tlb_fns 354 .endm 355 356 .macro globl_equ x, y 357 .globl \x 358 .equ \x, \y 359 .endm 360 361 .macro initfn, func, base 362 .long \func - \base 363 .endm 364 365 /* 366 * Macro to calculate the log2 size for the protection region 367 * registers. This calculates rd = log2(size) - 1. tmp must 368 * not be the same register as rd. 369 */ 370 .macro pr_sz, rd, size, tmp 371 mov \tmp, \size, lsr #12 372 mov \rd, #11 373 1: movs \tmp, \tmp, lsr #1 374 addne \rd, \rd, #1 375 bne 1b 376 .endm 377 378 /* 379 * Macro to generate a protection region register value 380 * given a pre-masked address, size, and enable bit. 381 * Corrupts size. 382 */ 383 .macro pr_val, dest, addr, size, enable 384 pr_sz \dest, \size, \size @ calculate log2(size) - 1 385 orr \dest, \addr, \dest, lsl #1 @ mask in the region size 386 orr \dest, \dest, \enable 387 .endm 388