1/* 2 * Copyright (c) 2017-2025, Arm Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7#include <arch.h> 8#include <asm_macros.S> 9#include <common/bl_common.h> 10#include <cortex_a76.h> 11#include <cpu_macros.S> 12#include <dsu_macros.S> 13#include <plat_macros.S> 14#include <services/arm_arch_svc.h> 15#include "wa_cve_2022_23960_bhb.S" 16 17/* Hardware handled coherency */ 18#if HW_ASSISTED_COHERENCY == 0 19#error "Cortex-A76 must be compiled with HW_ASSISTED_COHERENCY enabled" 20#endif 21 .globl cortex_a76_reset_func 22 .globl cortex_a76_core_pwr_dwn 23 .globl cortex_a76_disable_wa_cve_2018_3639 24 25/* 64-bit only core */ 26#if CTX_INCLUDE_AARCH32_REGS == 1 27#error "Cortex-A76 supports only AArch64. Compile with CTX_INCLUDE_AARCH32_REGS=0" 28#endif 29 30#define ESR_EL3_A64_SMC0 0x5e000000 31#define ESR_EL3_A32_SMC0 0x4e000000 32 33cpu_reset_prologue cortex_a76 34 35#if DYNAMIC_WORKAROUND_CVE_2018_3639 36 /* 37 * This macro applies the mitigation for CVE-2018-3639. 38 * It implements a fast path where `SMCCC_ARCH_WORKAROUND_2` 39 * SMC calls from a lower EL running in AArch32 or AArch64 40 * will go through the fast and return early. 41 * 42 * The macro saves x2-x3 to the context. In the fast path 43 * x0-x3 registers do not need to be restored as the calling 44 * context will have saved them. The macro also saves 45 * x29-x30 to the context in the sync_exception path. 46 */ 47 .macro apply_cve_2018_3639_wa _is_sync_exception _esr_el3_val 48 stp x2, x3, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X2] 49 .if \_is_sync_exception 50 stp x29, x30, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X29] 51 mov_imm w2, \_esr_el3_val 52 bl apply_cve_2018_3639_sync_wa 53 ldp x29, x30, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X29] 54 .endif 55 /* 56 * Always enable v4 mitigation during EL3 execution. This is not 57 * required for the fast path above because it does not perform any 58 * memory loads. 59 */ 60 mrs x2, CORTEX_A76_CPUACTLR2_EL1 61 orr x2, x2, #CORTEX_A76_CPUACTLR2_EL1_DISABLE_LOAD_PASS_STORE 62 msr CORTEX_A76_CPUACTLR2_EL1, x2 63 isb 64 65 /* 66 * The caller may have passed arguments to EL3 via x2-x3. 67 * Restore these registers from the context before jumping to the 68 * main runtime vector table entry. 69 */ 70 ldp x2, x3, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X2] 71 .endm 72#endif /* DYNAMIC_WORKAROUND_CVE_2018_3639 */ 73 74#if DYNAMIC_WORKAROUND_CVE_2018_3639 || WORKAROUND_CVE_2022_23960 75vector_base cortex_a76_wa_cve_vbar 76 77 /* --------------------------------------------------------------------- 78 * Current EL with SP_EL0 : 0x0 - 0x200 79 * --------------------------------------------------------------------- 80 */ 81vector_entry cortex_a76_sync_exception_sp_el0 82 b sync_exception_sp_el0 83end_vector_entry cortex_a76_sync_exception_sp_el0 84 85vector_entry cortex_a76_irq_sp_el0 86 b irq_sp_el0 87end_vector_entry cortex_a76_irq_sp_el0 88 89vector_entry cortex_a76_fiq_sp_el0 90 b fiq_sp_el0 91end_vector_entry cortex_a76_fiq_sp_el0 92 93vector_entry cortex_a76_serror_sp_el0 94 b serror_sp_el0 95end_vector_entry cortex_a76_serror_sp_el0 96 97 /* --------------------------------------------------------------------- 98 * Current EL with SP_ELx: 0x200 - 0x400 99 * --------------------------------------------------------------------- 100 */ 101vector_entry cortex_a76_sync_exception_sp_elx 102 b sync_exception_sp_elx 103end_vector_entry cortex_a76_sync_exception_sp_elx 104 105vector_entry cortex_a76_irq_sp_elx 106 b irq_sp_elx 107end_vector_entry cortex_a76_irq_sp_elx 108 109vector_entry cortex_a76_fiq_sp_elx 110 b fiq_sp_elx 111end_vector_entry cortex_a76_fiq_sp_elx 112 113vector_entry cortex_a76_serror_sp_elx 114 b serror_sp_elx 115end_vector_entry cortex_a76_serror_sp_elx 116 117 /* --------------------------------------------------------------------- 118 * Lower EL using AArch64 : 0x400 - 0x600 119 * --------------------------------------------------------------------- 120 */ 121vector_entry cortex_a76_sync_exception_aarch64 122 123#if WORKAROUND_CVE_2022_23960 124 apply_cve_2022_23960_bhb_wa CORTEX_A76_BHB_LOOP_COUNT 125#endif /* WORKAROUND_CVE_2022_23960 */ 126 127#if DYNAMIC_WORKAROUND_CVE_2018_3639 128 apply_cve_2018_3639_wa _is_sync_exception=1 _esr_el3_val=ESR_EL3_A64_SMC0 129#endif /* DYNAMIC_WORKAROUND_CVE_2018_3639*/ 130 131 b sync_exception_aarch64 132end_vector_entry cortex_a76_sync_exception_aarch64 133 134vector_entry cortex_a76_irq_aarch64 135 136#if WORKAROUND_CVE_2022_23960 137 apply_cve_2022_23960_bhb_wa CORTEX_A76_BHB_LOOP_COUNT 138#endif /* WORKAROUND_CVE_2022_23960 */ 139 140#if DYNAMIC_WORKAROUND_CVE_2018_3639 141 apply_cve_2018_3639_wa _is_sync_exception=0 _esr_el3_val=ESR_EL3_A64_SMC0 142#endif /* DYNAMIC_WORKAROUND_CVE_2018_3639*/ 143 144 b irq_aarch64 145end_vector_entry cortex_a76_irq_aarch64 146 147vector_entry cortex_a76_fiq_aarch64 148 149#if WORKAROUND_CVE_2022_23960 150 apply_cve_2022_23960_bhb_wa CORTEX_A76_BHB_LOOP_COUNT 151#endif /* WORKAROUND_CVE_2022_23960 */ 152 153#if DYNAMIC_WORKAROUND_CVE_2018_3639 154 apply_cve_2018_3639_wa _is_sync_exception=0 _esr_el3_val=ESR_EL3_A64_SMC0 155#endif /* DYNAMIC_WORKAROUND_CVE_2018_3639*/ 156 157 b fiq_aarch64 158end_vector_entry cortex_a76_fiq_aarch64 159 160vector_entry cortex_a76_serror_aarch64 161 162#if WORKAROUND_CVE_2022_23960 163 apply_cve_2022_23960_bhb_wa CORTEX_A76_BHB_LOOP_COUNT 164#endif /* WORKAROUND_CVE_2022_23960 */ 165 166#if DYNAMIC_WORKAROUND_CVE_2018_3639 167 apply_cve_2018_3639_wa _is_sync_exception=0 _esr_el3_val=ESR_EL3_A64_SMC0 168#endif /* DYNAMIC_WORKAROUND_CVE_2018_3639*/ 169 170 b serror_aarch64 171end_vector_entry cortex_a76_serror_aarch64 172 173 /* --------------------------------------------------------------------- 174 * Lower EL using AArch32 : 0x600 - 0x800 175 * --------------------------------------------------------------------- 176 */ 177vector_entry cortex_a76_sync_exception_aarch32 178 179#if WORKAROUND_CVE_2022_23960 180 apply_cve_2022_23960_bhb_wa CORTEX_A76_BHB_LOOP_COUNT 181#endif /* WORKAROUND_CVE_2022_23960 */ 182 183#if DYNAMIC_WORKAROUND_CVE_2018_3639 184 apply_cve_2018_3639_wa _is_sync_exception=1 _esr_el3_val=ESR_EL3_A32_SMC0 185#endif /* DYNAMIC_WORKAROUND_CVE_2018_3639*/ 186 187 b sync_exception_aarch32 188end_vector_entry cortex_a76_sync_exception_aarch32 189 190vector_entry cortex_a76_irq_aarch32 191 192#if WORKAROUND_CVE_2022_23960 193 apply_cve_2022_23960_bhb_wa CORTEX_A76_BHB_LOOP_COUNT 194#endif /* WORKAROUND_CVE_2022_23960 */ 195 196#if DYNAMIC_WORKAROUND_CVE_2018_3639 197 apply_cve_2018_3639_wa _is_sync_exception=0 _esr_el3_val=ESR_EL3_A32_SMC0 198#endif /* DYNAMIC_WORKAROUND_CVE_2018_3639*/ 199 200 b irq_aarch32 201end_vector_entry cortex_a76_irq_aarch32 202 203vector_entry cortex_a76_fiq_aarch32 204 205#if WORKAROUND_CVE_2022_23960 206 apply_cve_2022_23960_bhb_wa CORTEX_A76_BHB_LOOP_COUNT 207#endif /* WORKAROUND_CVE_2022_23960 */ 208 209#if DYNAMIC_WORKAROUND_CVE_2018_3639 210 apply_cve_2018_3639_wa _is_sync_exception=0 _esr_el3_val=ESR_EL3_A32_SMC0 211#endif /* DYNAMIC_WORKAROUND_CVE_2018_3639*/ 212 213 b fiq_aarch32 214end_vector_entry cortex_a76_fiq_aarch32 215 216vector_entry cortex_a76_serror_aarch32 217 218#if WORKAROUND_CVE_2022_23960 219 apply_cve_2022_23960_bhb_wa CORTEX_A76_BHB_LOOP_COUNT 220#endif /* WORKAROUND_CVE_2022_23960 */ 221 222#if DYNAMIC_WORKAROUND_CVE_2018_3639 223 apply_cve_2018_3639_wa _is_sync_exception=0 _esr_el3_val=ESR_EL3_A32_SMC0 224#endif /* DYNAMIC_WORKAROUND_CVE_2018_3639*/ 225 226 b serror_aarch32 227end_vector_entry cortex_a76_serror_aarch32 228#endif /* DYNAMIC_WORKAROUND_CVE_2018_3639 || WORKAROUND_CVE_2022_23960 */ 229 230#if DYNAMIC_WORKAROUND_CVE_2018_3639 231 /* 232 * ----------------------------------------------------------------- 233 * This function applies the mitigation for CVE-2018-3639 234 * specifically for sync exceptions. It implements a fast path 235 * where `SMCCC_ARCH_WORKAROUND_2` SMC calls from a lower EL 236 * running in AArch64 will go through the fast and return early. 237 * 238 * In the fast path x0-x3 registers do not need to be restored as the 239 * calling context will have saved them. 240 * 241 * Caller must pass value of esr_el3 to compare via x2. 242 * Save and restore these registers outside of this function from the 243 * context before jumping to the main runtime vector table entry. 244 * 245 * Shall clobber: x0-x3, x30 246 * ----------------------------------------------------------------- 247 */ 248func apply_cve_2018_3639_sync_wa 249 /* 250 * Ensure SMC is coming from A64/A32 state on #0 251 * with W0 = SMCCC_ARCH_WORKAROUND_2 252 * 253 * This sequence evaluates as: 254 * (W0==SMCCC_ARCH_WORKAROUND_2) ? (ESR_EL3==SMC#0) : (NE) 255 * allowing use of a single branch operation 256 * X2 populated outside this function with the SMC FID. 257 */ 258 orr w3, wzr, #SMCCC_ARCH_WORKAROUND_2 259 cmp x0, x3 260 mrs x3, esr_el3 261 262 ccmp w2, w3, #0, eq 263 /* 264 * Static predictor will predict a fall-through, optimizing 265 * the `SMCCC_ARCH_WORKAROUND_2` fast path. 266 */ 267 bne 1f 268 269 /* 270 * The sequence below implements the `SMCCC_ARCH_WORKAROUND_2` 271 * fast path. 272 */ 273 cmp x1, xzr /* enable/disable check */ 274 275 /* 276 * When the calling context wants mitigation disabled, 277 * we program the mitigation disable function in the 278 * CPU context, which gets invoked on subsequent exits from 279 * EL3 via the `el3_exit` function. Otherwise NULL is 280 * programmed in the CPU context, which results in caller's 281 * inheriting the EL3 mitigation state (enabled) on subsequent 282 * `el3_exit`. 283 */ 284 mov x0, xzr 285 adr x1, cortex_a76_disable_wa_cve_2018_3639 286 csel x1, x1, x0, eq 287 str x1, [sp, #CTX_CVE_2018_3639_OFFSET + CTX_CVE_2018_3639_DISABLE] 288 289 mrs x2, CORTEX_A76_CPUACTLR2_EL1 290 orr x1, x2, #CORTEX_A76_CPUACTLR2_EL1_DISABLE_LOAD_PASS_STORE 291 bic x3, x2, #CORTEX_A76_CPUACTLR2_EL1_DISABLE_LOAD_PASS_STORE 292 csel x3, x3, x1, eq 293 msr CORTEX_A76_CPUACTLR2_EL1, x3 294 ldp x29, x30, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X29] 295 /* 296 * `SMCCC_ARCH_WORKAROUND_2`fast path return to lower EL. 297 */ 298 exception_return /* exception_return contains ISB */ 2991: 300 ret 301endfunc apply_cve_2018_3639_sync_wa 302#endif /* DYNAMIC_WORKAROUND_CVE_2018_3639 */ 303 304/* Erratum entry and check function for SMCCC_ARCH_WORKAROUND_2*/ 305add_erratum_entry cortex_a76, ERRATUM(ARCH_WORKAROUND_2), WORKAROUND_CVE_2018_3639 306 307check_erratum_chosen cortex_a76, ERRATUM(ARCH_WORKAROUND_2), WORKAROUND_CVE_2018_3639 308 309workaround_reset_start cortex_a76, ERRATUM(798953), ERRATA_DSU_798953 310 errata_dsu_798953_wa_impl 311workaround_reset_end cortex_a76, ERRATUM(798953) 312 313check_erratum_custom_start cortex_a76, ERRATUM(798953) 314 check_errata_dsu_798953_impl 315 ret 316check_erratum_custom_end cortex_a76, ERRATUM(798953) 317 318workaround_reset_start cortex_a76, ERRATUM(936184), ERRATA_DSU_936184 319 errata_dsu_936184_wa_impl 320workaround_reset_end cortex_a76, ERRATUM(936184) 321 322check_erratum_custom_start cortex_a76, ERRATUM(936184) 323 check_errata_dsu_936184_impl 324 ret 325check_erratum_custom_end cortex_a76, ERRATUM(936184) 326 327workaround_reset_start cortex_a76, ERRATUM(1073348), ERRATA_A76_1073348 328 sysreg_bit_set CORTEX_A76_CPUACTLR_EL1 ,CORTEX_A76_CPUACTLR_EL1_DISABLE_STATIC_PREDICTION 329workaround_reset_end cortex_a76, ERRATUM(1073348) 330 331check_erratum_ls cortex_a76, ERRATUM(1073348), CPU_REV(1, 0) 332 333workaround_reset_start cortex_a76, ERRATUM(1130799), ERRATA_A76_1130799 334 sysreg_bit_set CORTEX_A76_CPUACTLR2_EL1, CORTEX_A76_CPUACTLR2_EL1_BIT_59 335 msr CORTEX_A76_CPUACTLR2_EL1, x1 336workaround_reset_end cortex_a76, ERRATUM(1130799) 337 338check_erratum_ls cortex_a76, ERRATUM(1130799), CPU_REV(2, 0) 339 340/* -------------------------------------------------------------- 341 * Errata Workaround for Cortex A76 Errata #1165522. 342 * This applies only to revisions <= r3p0 of Cortex A76. 343 * Due to the nature of the errata it is applied unconditionally 344 * when built in, report it as applicable in this case 345 * -------------------------------------------------------------- 346 */ 347check_erratum_custom_start cortex_a76, ERRATUM(1165522) 348#if ERRATA_A76_1165522 349 mov x0, #ERRATA_APPLIES 350#else 351 cpu_rev_var_ls CPU_REV(3, 0) 352#endif 353 ret 354check_erratum_custom_end cortex_a76, ERRATUM(1165522) 355 356add_erratum_entry cortex_a76, ERRATUM(1165522), ERRATA_A76_1165522 357 358workaround_reset_start cortex_a76, ERRATUM(1220197), ERRATA_A76_1220197 359 sysreg_bit_set CORTEX_A76_CPUECTLR_EL1, CORTEX_A76_CPUECTLR_EL1_WS_THR_L2 360workaround_reset_end cortex_a76, ERRATUM(1220197) 361 362check_erratum_ls cortex_a76, ERRATUM(1220197), CPU_REV(2, 0) 363 364workaround_reset_start cortex_a76, ERRATUM(1257314), ERRATA_A76_1257314 365 sysreg_bit_set CORTEX_A76_CPUACTLR3_EL1, CORTEX_A76_CPUACTLR3_EL1_BIT_10 366workaround_reset_end cortex_a76, ERRATUM(1257314) 367 368check_erratum_ls cortex_a76, ERRATUM(1257314), CPU_REV(3, 0) 369 370workaround_reset_start cortex_a76, ERRATUM(1262606), ERRATA_A76_1262606 371 sysreg_bit_set CORTEX_A76_CPUACTLR_EL1, CORTEX_A76_CPUACTLR_EL1_BIT_13 372workaround_reset_end cortex_a76, ERRATUM(1262606) 373 374check_erratum_ls cortex_a76, ERRATUM(1262606), CPU_REV(3, 0) 375 376workaround_reset_start cortex_a76, ERRATUM(1262888), ERRATA_A76_1262888 377 sysreg_bit_set CORTEX_A76_CPUECTLR_EL1, CORTEX_A76_CPUECTLR_EL1_BIT_51 378workaround_reset_end cortex_a76, ERRATUM(1262888) 379 380check_erratum_ls cortex_a76, ERRATUM(1262888), CPU_REV(3, 0) 381 382workaround_reset_start cortex_a76, ERRATUM(1275112), ERRATA_A76_1275112 383 sysreg_bit_set CORTEX_A76_CPUACTLR_EL1, CORTEX_A76_CPUACTLR_EL1_BIT_13 384workaround_reset_end cortex_a76, ERRATUM(1275112) 385 386check_erratum_ls cortex_a76, ERRATUM(1275112), CPU_REV(3, 0) 387 388check_erratum_custom_start cortex_a76, ERRATUM(1286807) 389#if ERRATA_A76_1286807 390 mov x0, #ERRATA_APPLIES 391#else 392 cpu_rev_var_ls CPU_REV(3, 0) 393#endif 394 ret 395check_erratum_custom_end cortex_a76, ERRATUM(1286807) 396 397add_erratum_entry cortex_a76, ERRATUM(1286807), ERRATA_A76_1286807 398 399workaround_reset_start cortex_a76, ERRATUM(1791580), ERRATA_A76_1791580 400 sysreg_bit_set CORTEX_A76_CPUACTLR2_EL1, CORTEX_A76_CPUACTLR2_EL1_BIT_2 401workaround_reset_end cortex_a76, ERRATUM(1791580) 402 403check_erratum_ls cortex_a76, ERRATUM(1791580), CPU_REV(4, 0) 404 405workaround_reset_start cortex_a76, ERRATUM(1868343), ERRATA_A76_1868343 406 sysreg_bit_set CORTEX_A76_CPUACTLR_EL1, CORTEX_A76_CPUACTLR_EL1_BIT_13 407workaround_reset_end cortex_a76, ERRATUM(1868343) 408 409check_erratum_ls cortex_a76, ERRATUM(1868343), CPU_REV(4, 0) 410 411workaround_reset_start cortex_a76, ERRATUM(1946160), ERRATA_A76_1946160 412 mov x0, #3 413 msr S3_6_C15_C8_0, x0 414 ldr x0, =0x10E3900002 415 msr S3_6_C15_C8_2, x0 416 ldr x0, =0x10FFF00083 417 msr S3_6_C15_C8_3, x0 418 ldr x0, =0x2001003FF 419 msr S3_6_C15_C8_1, x0 420 421 mov x0, #4 422 msr S3_6_C15_C8_0, x0 423 ldr x0, =0x10E3800082 424 msr S3_6_C15_C8_2, x0 425 ldr x0, =0x10FFF00083 426 msr S3_6_C15_C8_3, x0 427 ldr x0, =0x2001003FF 428 msr S3_6_C15_C8_1, x0 429 430 mov x0, #5 431 msr S3_6_C15_C8_0, x0 432 ldr x0, =0x10E3800200 433 msr S3_6_C15_C8_2, x0 434 ldr x0, =0x10FFF003E0 435 msr S3_6_C15_C8_3, x0 436 ldr x0, =0x2001003FF 437 msr S3_6_C15_C8_1, x0 438workaround_reset_end cortex_a76, ERRATUM(1946160) 439 440check_erratum_range cortex_a76, ERRATUM(1946160), CPU_REV(3, 0), CPU_REV(4, 1) 441 442workaround_runtime_start cortex_a76, ERRATUM(2743102), ERRATA_A76_2743102 443 /* dsb before isb of power down sequence */ 444 dsb sy 445workaround_runtime_end cortex_a76, ERRATUM(2743102) 446 447check_erratum_ls cortex_a76, ERRATUM(2743102), CPU_REV(4, 1) 448 449check_erratum_chosen cortex_a76, CVE(2018, 3639), WORKAROUND_CVE_2018_3639 450 451func cortex_a76_disable_wa_cve_2018_3639 452 sysreg_bit_clear CORTEX_A76_CPUACTLR2_EL1, CORTEX_A76_CPUACTLR2_EL1_DISABLE_LOAD_PASS_STORE 453 isb 454 ret 455endfunc cortex_a76_disable_wa_cve_2018_3639 456 457check_erratum_chosen cortex_a76, CVE(2022, 23960), WORKAROUND_CVE_2022_23960 458 459/* erratum has no workaround in the cpu. Generic code must take care */ 460add_erratum_entry cortex_a76, CVE(2022, 23960), WORKAROUND_CVE_2022_23960 461 462cpu_reset_func_start cortex_a76 463 464#if WORKAROUND_CVE_2018_3639 465 /* If the PE implements SSBS, we don't need the dynamic workaround */ 466 mrs x0, id_aa64pfr1_el1 467 lsr x0, x0, #ID_AA64PFR1_EL1_SSBS_SHIFT 468 and x0, x0, #ID_AA64PFR1_EL1_SSBS_MASK 469#if !DYNAMIC_WORKAROUND_CVE_2018_3639 && ENABLE_ASSERTIONS 470 cmp x0, 0 471 ASM_ASSERT(ne) 472#endif 473#if DYNAMIC_WORKAROUND_CVE_2018_3639 474 cbnz x0, 1f 475 sysreg_bit_set CORTEX_A76_CPUACTLR2_EL1, CORTEX_A76_CPUACTLR2_EL1_DISABLE_LOAD_PASS_STORE 476 isb 477 478#ifdef IMAGE_BL31 479 /* 480 * The Cortex-A76 generic vectors are overwritten to use the vectors 481 * defined above. This is required in order to apply mitigation 482 * against CVE-2018-3639 on exception entry from lower ELs. 483 * If the below vector table is used, skip overriding it again for 484 * CVE_2022_23960 as both use the same vbar. 485 */ 486 override_vector_table cortex_a76_wa_cve_vbar 487 isb 488 b 2f 489#endif /* IMAGE_BL31 */ 490 4911: 492#endif /* DYNAMIC_WORKAROUND_CVE_2018_3639 */ 493#endif /* WORKAROUND_CVE_2018_3639 */ 494 495#if IMAGE_BL31 && WORKAROUND_CVE_2022_23960 496 /* 497 * The Cortex-A76 generic vectors are overridden to apply errata 498 * mitigation on exception entry from lower ELs. This will be bypassed 499 * if DYNAMIC_WORKAROUND_CVE_2018_3639 has overridden the vectors. 500 */ 501 override_vector_table cortex_a76_wa_cve_vbar 502 isb 503#endif /* IMAGE_BL31 && WORKAROUND_CVE_2022_23960 */ 5042: 505cpu_reset_func_end cortex_a76 506 507 /* --------------------------------------------- 508 * HW will do the cache maintenance while powering down 509 * --------------------------------------------- 510 */ 511func cortex_a76_core_pwr_dwn 512 /* --------------------------------------------- 513 * Enable CPU power down bit in power control register 514 * --------------------------------------------- 515 */ 516 sysreg_bit_set CORTEX_A76_CPUPWRCTLR_EL1, CORTEX_A76_CORE_PWRDN_EN_MASK 517 518 apply_erratum cortex_a76, ERRATUM(2743102), ERRATA_A76_2743102, NO_GET_CPU_REV 519 520 isb 521 ret 522endfunc cortex_a76_core_pwr_dwn 523 524 /* --------------------------------------------- 525 * This function provides cortex_a76 specific 526 * register information for crash reporting. 527 * It needs to return with x6 pointing to 528 * a list of register names in ascii and 529 * x8 - x15 having values of registers to be 530 * reported. 531 * --------------------------------------------- 532 */ 533.section .rodata.cortex_a76_regs, "aS" 534cortex_a76_regs: /* The ascii list of register names to be reported */ 535 .asciz "cpuectlr_el1", "" 536 537func cortex_a76_cpu_reg_dump 538 adr x6, cortex_a76_regs 539 mrs x8, CORTEX_A76_CPUECTLR_EL1 540 ret 541endfunc cortex_a76_cpu_reg_dump 542 543declare_cpu_ops cortex_a76, CORTEX_A76_MIDR, \ 544 cortex_a76_reset_func, \ 545 cortex_a76_core_pwr_dwn 546