| 1 | /** @file
|
|---|
| 2 | * IPRT - ARM Specific Assembly Functions.
|
|---|
| 3 | */
|
|---|
| 4 |
|
|---|
| 5 | /*
|
|---|
| 6 | * Copyright (C) 2015-2023 Oracle and/or its affiliates.
|
|---|
| 7 | *
|
|---|
| 8 | * This file is part of VirtualBox base platform packages, as
|
|---|
| 9 | * available from https://www.virtualbox.org.
|
|---|
| 10 | *
|
|---|
| 11 | * This program is free software; you can redistribute it and/or
|
|---|
| 12 | * modify it under the terms of the GNU General Public License
|
|---|
| 13 | * as published by the Free Software Foundation, in version 3 of the
|
|---|
| 14 | * License.
|
|---|
| 15 | *
|
|---|
| 16 | * This program is distributed in the hope that it will be useful, but
|
|---|
| 17 | * WITHOUT ANY WARRANTY; without even the implied warranty of
|
|---|
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|---|
| 19 | * General Public License for more details.
|
|---|
| 20 | *
|
|---|
| 21 | * You should have received a copy of the GNU General Public License
|
|---|
| 22 | * along with this program; if not, see <https://www.gnu.org/licenses>.
|
|---|
| 23 | *
|
|---|
| 24 | * The contents of this file may alternatively be used under the terms
|
|---|
| 25 | * of the Common Development and Distribution License Version 1.0
|
|---|
| 26 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
|
|---|
| 27 | * in the VirtualBox distribution, in which case the provisions of the
|
|---|
| 28 | * CDDL are applicable instead of those of the GPL.
|
|---|
| 29 | *
|
|---|
| 30 | * You may elect to license modified versions of this file under the
|
|---|
| 31 | * terms and conditions of either the GPL or the CDDL or both.
|
|---|
| 32 | *
|
|---|
| 33 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
|
|---|
| 34 | */
|
|---|
| 35 |
|
|---|
| 36 | #ifndef IPRT_INCLUDED_asm_arm_h
|
|---|
| 37 | #define IPRT_INCLUDED_asm_arm_h
|
|---|
| 38 | #ifndef RT_WITHOUT_PRAGMA_ONCE
|
|---|
| 39 | # pragma once
|
|---|
| 40 | #endif
|
|---|
| 41 |
|
|---|
| 42 | #include <iprt/types.h>
|
|---|
| 43 | #if !defined(RT_ARCH_ARM64) && !defined(RT_ARCH_ARM32)
|
|---|
| 44 | # error "Not on ARM64 or ARM32"
|
|---|
| 45 | #endif
|
|---|
| 46 |
|
|---|
| 47 | /** @defgroup grp_rt_asm_arm ARM Specific ASM Routines
|
|---|
| 48 | * @ingroup grp_rt_asm
|
|---|
| 49 | * @{
|
|---|
| 50 | */
|
|---|
| 51 |
|
|---|
| 52 | /**
|
|---|
| 53 | * Gets the content of the CNTVCT_EL0 (or CNTPCT) register.
|
|---|
| 54 | *
|
|---|
| 55 | * @returns CNTVCT_EL0 value.
|
|---|
| 56 | * @note We call this TSC to better fit in with existing x86/amd64 based code.
|
|---|
| 57 | */
|
|---|
| 58 | #if RT_INLINE_ASM_EXTERNAL
|
|---|
| 59 | DECLASM(uint64_t) ASMReadTSC(void);
|
|---|
| 60 | #else
|
|---|
| 61 | DECLINLINE(uint64_t) ASMReadTSC(void)
|
|---|
| 62 | {
|
|---|
| 63 | # if RT_INLINE_ASM_GNU_STYLE
|
|---|
| 64 | uint64_t u64;
|
|---|
| 65 | # ifdef RT_ARCH_ARM64
|
|---|
| 66 | __asm__ __volatile__("Lstart_ASMReadTSC_%=:\n\t"
|
|---|
| 67 | "isb\n\t"
|
|---|
| 68 | "mrs %0, CNTVCT_EL0\n\t"
|
|---|
| 69 | : "=r" (u64));
|
|---|
| 70 | # else
|
|---|
| 71 | uint32_t u32Spill;
|
|---|
| 72 | uint32_t u32Comp;
|
|---|
| 73 | __asm__ __volatile__("Lstart_ASMReadTSC_%=:\n\t"
|
|---|
| 74 | "isb\n"
|
|---|
| 75 | "Ltry_again_ASMReadTSC_%=:\n\t"
|
|---|
| 76 | "mrrc p15, 0, %[uSpill], %H[uRet], c14\n\t" /* CNTPCT high into uRet.hi */
|
|---|
| 77 | "mrrc p15, 0, %[uRet], %[uSpill], c14\n\t" /* CNTPCT low into uRet.lo */
|
|---|
| 78 | "mrrc p15, 0, %[uSpill], %[uHiComp], c14\n\t" /* CNTPCT high into uHiComp */
|
|---|
| 79 | "cmp %H[uRet], %[uHiComp]\n\t"
|
|---|
| 80 | "b.eq Ltry_again_ASMReadTSC_%=\n\t" /* Redo if high value changed. */
|
|---|
| 81 | : [uRet] "=r" (u64)
|
|---|
| 82 | , "=r" (uHiComp)
|
|---|
| 83 | , "=r" (uSpill));
|
|---|
| 84 | # endif
|
|---|
| 85 | return u64;
|
|---|
| 86 |
|
|---|
| 87 | # else
|
|---|
| 88 | # error "Unsupported compiler"
|
|---|
| 89 | # endif
|
|---|
| 90 | }
|
|---|
| 91 | #endif
|
|---|
| 92 |
|
|---|
| 93 |
|
|---|
| 94 | /**
|
|---|
| 95 | * Gets the content of the CNTFRQ_EL0 register.
|
|---|
| 96 | *
|
|---|
| 97 | * @returns CNTFRQ_EL0 value.
|
|---|
| 98 | */
|
|---|
| 99 | #if RT_INLINE_ASM_EXTERNAL
|
|---|
| 100 | DECLASM(uint64_t) ASMReadCntFrqEl0(void);
|
|---|
| 101 | #else
|
|---|
| 102 | DECLINLINE(uint64_t) ASMReadCntFrqEl0(void)
|
|---|
| 103 | {
|
|---|
| 104 | # if RT_INLINE_ASM_GNU_STYLE
|
|---|
| 105 | uint64_t u64;
|
|---|
| 106 | # ifdef RT_ARCH_ARM64
|
|---|
| 107 | __asm__ __volatile__("Lstart_ASMReadCntFrqEl0_%=:\n\t"
|
|---|
| 108 | "isb\n\t"
|
|---|
| 109 | "mrs %0, CNTFRQ_EL0\n\t"
|
|---|
| 110 | : "=r" (u64));
|
|---|
| 111 | # else
|
|---|
| 112 | u64 = 0;
|
|---|
| 113 | __asm__ __volatile__("Lstart_ASMReadCntFrqEl0_%=:\n\t"
|
|---|
| 114 | "isb\n\t"
|
|---|
| 115 | "mrc p15, 0, %[uRet], c14, 0, 0\n\t" /* CNTFRQ */
|
|---|
| 116 | : [uRet] "=r" (u64));
|
|---|
| 117 | # endif
|
|---|
| 118 | return u64;
|
|---|
| 119 |
|
|---|
| 120 | # else
|
|---|
| 121 | # error "Unsupported compiler"
|
|---|
| 122 | # endif
|
|---|
| 123 | }
|
|---|
| 124 | #endif
|
|---|
| 125 |
|
|---|
| 126 |
|
|---|
| 127 | /**
|
|---|
| 128 | * Enables interrupts (IRQ and FIQ).
|
|---|
| 129 | */
|
|---|
| 130 | #if RT_INLINE_ASM_EXTERNAL
|
|---|
| 131 | DECLASM(void) ASMIntEnable(void);
|
|---|
| 132 | #else
|
|---|
| 133 | DECLINLINE(void) ASMIntEnable(void)
|
|---|
| 134 | {
|
|---|
| 135 | # if RT_INLINE_ASM_GNU_STYLE
|
|---|
| 136 | # ifdef RT_ARCH_ARM64
|
|---|
| 137 | __asm__ __volatile__("Lstart_ASMIntEnable_%=:\n\t"
|
|---|
| 138 | "msr daifclr, #0xf\n\t");
|
|---|
| 139 | # else
|
|---|
| 140 | RTCCUINTREG uFlags;
|
|---|
| 141 | __asm__ __volatile__("Lstart_ASMIntEnable_%=:\n\t"
|
|---|
| 142 | "mrs %0, cpsr\n\t"
|
|---|
| 143 | "bic %0, %0, #0xc0\n\t"
|
|---|
| 144 | "msr cpsr_c, %0\n\t"
|
|---|
| 145 | : "=r" (uFlags));
|
|---|
| 146 | # endif
|
|---|
| 147 | # else
|
|---|
| 148 | # error "Unsupported compiler"
|
|---|
| 149 | # endif
|
|---|
| 150 | }
|
|---|
| 151 | #endif
|
|---|
| 152 |
|
|---|
| 153 |
|
|---|
| 154 | /**
|
|---|
| 155 | * Disables interrupts (IRQ and FIQ).
|
|---|
| 156 | */
|
|---|
| 157 | #if RT_INLINE_ASM_EXTERNAL
|
|---|
| 158 | DECLASM(void) ASMIntDisable(void);
|
|---|
| 159 | #else
|
|---|
| 160 | DECLINLINE(void) ASMIntDisable(void)
|
|---|
| 161 | {
|
|---|
| 162 | # if RT_INLINE_ASM_GNU_STYLE
|
|---|
| 163 | # ifdef RT_ARCH_ARM64
|
|---|
| 164 | __asm__ __volatile__("Lstart_ASMIntDisable_%=:\n\t"
|
|---|
| 165 | "msr daifset, #0xf\n\t");
|
|---|
| 166 | # else
|
|---|
| 167 | RTCCUINTREG uFlags;
|
|---|
| 168 | __asm__ __volatile__("Lstart_ASMIntDisable_%=:\n\t"
|
|---|
| 169 | "mrs %0, cpsr\n\t"
|
|---|
| 170 | "orr %0, %0, #0xc0\n\t"
|
|---|
| 171 | "msr cpsr_c, %0\n\t"
|
|---|
| 172 | : "=r" (uFlags));
|
|---|
| 173 | # endif
|
|---|
| 174 | # else
|
|---|
| 175 | # error "Unsupported compiler"
|
|---|
| 176 | # endif
|
|---|
| 177 | }
|
|---|
| 178 | #endif
|
|---|
| 179 |
|
|---|
| 180 |
|
|---|
| 181 | /**
|
|---|
| 182 | * Disables interrupts and returns previous uFLAGS.
|
|---|
| 183 | */
|
|---|
| 184 | #if RT_INLINE_ASM_EXTERNAL
|
|---|
| 185 | DECLASM(RTCCUINTREG) ASMIntDisableFlags(void);
|
|---|
| 186 | #else
|
|---|
| 187 | DECLINLINE(RTCCUINTREG) ASMIntDisableFlags(void)
|
|---|
| 188 | {
|
|---|
| 189 | RTCCUINTREG uFlags;
|
|---|
| 190 | # if RT_INLINE_ASM_GNU_STYLE
|
|---|
| 191 | # ifdef RT_ARCH_ARM64
|
|---|
| 192 | __asm__ __volatile__("Lstart_ASMIntDisableFlags_%=:\n\t"
|
|---|
| 193 | "mrs %[uRet], daif\n\t"
|
|---|
| 194 | "msr daifset, #0xf\n\t"
|
|---|
| 195 | : [uRet] "=r" (uFlags));
|
|---|
| 196 | # else
|
|---|
| 197 | RTCCUINTREG uNewFlags;
|
|---|
| 198 | __asm__ __volatile__("Lstart_ASMIntDisableFlags_%=:\n\t"
|
|---|
| 199 | "mrs %0, cpsr\n\t"
|
|---|
| 200 | "orr %1, %0, #0xc0\n\t"
|
|---|
| 201 | "msr cpsr_c, %1\n\t"
|
|---|
| 202 | : "=r" (uFlags)
|
|---|
| 203 | , "=r" (uNewFlags));
|
|---|
| 204 | # endif
|
|---|
| 205 | # else
|
|---|
| 206 | # error "Unsupported compiler"
|
|---|
| 207 | # endif
|
|---|
| 208 | return uFlags;
|
|---|
| 209 | }
|
|---|
| 210 |
|
|---|
| 211 |
|
|---|
| 212 | /**
|
|---|
| 213 | * Get the CPSR/PSTATE register.
|
|---|
| 214 | * @returns CPSR/PSTATE.
|
|---|
| 215 | */
|
|---|
| 216 | #if RT_INLINE_ASM_EXTERNAL
|
|---|
| 217 | DECLASM(RTCCUINTREG) ASMGetFlags(void);
|
|---|
| 218 | #else
|
|---|
| 219 | DECLINLINE(RTCCUINTREG) ASMGetFlags(void)
|
|---|
| 220 | {
|
|---|
| 221 | RTCCUINTREG uFlags;
|
|---|
| 222 | # if RT_INLINE_ASM_GNU_STYLE
|
|---|
| 223 | # ifdef RT_ARCH_ARM64
|
|---|
| 224 | __asm__ __volatile__("Lstart_ASMGetFlags_%=:\n\t"
|
|---|
| 225 | "isb\n\t"
|
|---|
| 226 | "mrs %0, daif\n\t"
|
|---|
| 227 | : "=r" (uFlags));
|
|---|
| 228 | # else
|
|---|
| 229 | # error "Implementation required for arm32"
|
|---|
| 230 | # endif
|
|---|
| 231 | # else
|
|---|
| 232 | # error "Unsupported compiler"
|
|---|
| 233 | # endif
|
|---|
| 234 | return uFlags;
|
|---|
| 235 | }
|
|---|
| 236 | #endif
|
|---|
| 237 |
|
|---|
| 238 |
|
|---|
| 239 | /**
|
|---|
| 240 | * Get the CPSR/PSTATE register.
|
|---|
| 241 | */
|
|---|
| 242 | #if RT_INLINE_ASM_EXTERNAL
|
|---|
| 243 | DECLASM(void) ASMSetFlags(RTCCUINTREG uFlags);
|
|---|
| 244 | #else
|
|---|
| 245 | DECLINLINE(void) ASMSetFlags(RTCCUINTREG uFlags)
|
|---|
| 246 | {
|
|---|
| 247 | # if RT_INLINE_ASM_GNU_STYLE
|
|---|
| 248 | # ifdef RT_ARCH_ARM64
|
|---|
| 249 | __asm__ __volatile__("Lstart_ASMSetFlags_%=:\n\t"
|
|---|
| 250 | "isb\n\t"
|
|---|
| 251 | "msr daif, %[uFlags]\n\t"
|
|---|
| 252 | : : [uFlags] "r" (uFlags));
|
|---|
| 253 | # else
|
|---|
| 254 | # error "Implementation required for arm32"
|
|---|
| 255 | # endif
|
|---|
| 256 | # else
|
|---|
| 257 | # error "Unsupported compiler"
|
|---|
| 258 | # endif
|
|---|
| 259 | }
|
|---|
| 260 | #endif
|
|---|
| 261 |
|
|---|
| 262 |
|
|---|
| 263 | /**
|
|---|
| 264 | * Are interrupts enabled?
|
|---|
| 265 | *
|
|---|
| 266 | * @returns true / false.
|
|---|
| 267 | */
|
|---|
| 268 | DECLINLINE(bool) ASMIntAreEnabled(void)
|
|---|
| 269 | {
|
|---|
| 270 | return ASMGetFlags() & 0xc0 /* IRQ and FIQ bits */ ? true : false;
|
|---|
| 271 | }
|
|---|
| 272 |
|
|---|
| 273 | #endif
|
|---|
| 274 |
|
|---|
| 275 | /**
|
|---|
| 276 | * Halts the CPU until interrupted.
|
|---|
| 277 | */
|
|---|
| 278 | #if RT_INLINE_ASM_EXTERNAL
|
|---|
| 279 | DECLASM(void) ASMHalt(void);
|
|---|
| 280 | #else
|
|---|
| 281 | DECLINLINE(void) ASMHalt(void)
|
|---|
| 282 | {
|
|---|
| 283 | # if RT_INLINE_ASM_GNU_STYLE
|
|---|
| 284 | __asm__ __volatile__ ("Lstart_ASMHalt_%=:\n\t"
|
|---|
| 285 | "wfi\n\t"); /* wait for interrupt */
|
|---|
| 286 | # else
|
|---|
| 287 | # error "Unsupported compiler"
|
|---|
| 288 | # endif
|
|---|
| 289 | }
|
|---|
| 290 | #endif
|
|---|
| 291 |
|
|---|
| 292 | #if 0
|
|---|
| 293 | /**
|
|---|
| 294 | * Gets the CPU ID of the current CPU.
|
|---|
| 295 | *
|
|---|
| 296 | * @returns the CPU ID.
|
|---|
| 297 | * @note the name of this method is a bit misleading but serves the purpose
|
|---|
| 298 | * and prevents #ifdef orgies in other places.
|
|---|
| 299 | */
|
|---|
| 300 | #if RT_INLINE_ASM_EXTERNAL
|
|---|
| 301 | DECLASM(uint8_t) ASMGetApicId(void);
|
|---|
| 302 | #else
|
|---|
| 303 | DECLINLINE(uint8_t) ASMGetApicId(void)
|
|---|
| 304 | {
|
|---|
| 305 | # if RT_INLINE_ASM_GNU_STYLE
|
|---|
| 306 | RTCCUINTREG uCpuId;
|
|---|
| 307 | __asm__ ("Lstart_ASMGetApicId_%=:\n\t"
|
|---|
| 308 | "mrc p15, 0, %0, c0, c0, 5\n\t" /* CPU ID Register, privileged */
|
|---|
| 309 | : "=r" (uCpuId));
|
|---|
| 310 | return uCpuId;
|
|---|
| 311 | # else
|
|---|
| 312 | # error "Unsupported compiler"
|
|---|
| 313 | # endif
|
|---|
| 314 | }
|
|---|
| 315 | #endif
|
|---|
| 316 | #endif
|
|---|
| 317 |
|
|---|
| 318 | #if 0
|
|---|
| 319 |
|
|---|
| 320 | /**
|
|---|
| 321 | * Invalidate page.
|
|---|
| 322 | *
|
|---|
| 323 | * @param pv Address of the page to invalidate.
|
|---|
| 324 | */
|
|---|
| 325 | #if RT_INLINE_ASM_EXTERNAL
|
|---|
| 326 | DECLASM(void) ASMInvalidatePage(void *pv);
|
|---|
| 327 | #else
|
|---|
| 328 | DECLINLINE(void) ASMInvalidatePage(void *pv)
|
|---|
| 329 | {
|
|---|
| 330 | # if RT_INLINE_ASM_GNU_STYLE
|
|---|
| 331 |
|
|---|
| 332 | # else
|
|---|
| 333 | # error "Unsupported compiler"
|
|---|
| 334 | # endif
|
|---|
| 335 | }
|
|---|
| 336 | #endif
|
|---|
| 337 |
|
|---|
| 338 |
|
|---|
| 339 | /**
|
|---|
| 340 | * Write back the internal caches and invalidate them.
|
|---|
| 341 | */
|
|---|
| 342 | #if RT_INLINE_ASM_EXTERNAL
|
|---|
| 343 | DECLASM(void) ASMWriteBackAndInvalidateCaches(void);
|
|---|
| 344 | #else
|
|---|
| 345 | DECLINLINE(void) ASMWriteBackAndInvalidateCaches(void)
|
|---|
| 346 | {
|
|---|
| 347 | # if RT_INLINE_ASM_GNU_STYLE
|
|---|
| 348 |
|
|---|
| 349 | # else
|
|---|
| 350 | # error "Unsupported compiler"
|
|---|
| 351 | # endif
|
|---|
| 352 | }
|
|---|
| 353 | #endif
|
|---|
| 354 |
|
|---|
| 355 |
|
|---|
| 356 | /**
|
|---|
| 357 | * Invalidate internal and (perhaps) external caches without first
|
|---|
| 358 | * flushing dirty cache lines. Use with extreme care.
|
|---|
| 359 | */
|
|---|
| 360 | #if RT_INLINE_ASM_EXTERNAL
|
|---|
| 361 | DECLASM(void) ASMInvalidateInternalCaches(void);
|
|---|
| 362 | #else
|
|---|
| 363 | DECLINLINE(void) ASMInvalidateInternalCaches(void)
|
|---|
| 364 | {
|
|---|
| 365 | # if RT_INLINE_ASM_GNU_STYLE
|
|---|
| 366 |
|
|---|
| 367 | # else
|
|---|
| 368 | # error "Unsupported compiler"
|
|---|
| 369 | # endif
|
|---|
| 370 | }
|
|---|
| 371 | #endif
|
|---|
| 372 |
|
|---|
| 373 | #endif
|
|---|
| 374 |
|
|---|
| 375 |
|
|---|
| 376 | /** @} */
|
|---|
| 377 | #endif /* !IPRT_INCLUDED_asm_arm_h */
|
|---|
| 378 |
|
|---|
