arch/arm64/include/asm/sysreg.h

   1 /*
   2  * Macros for accessing system registers with older binutils.
   3  *
   4  * Copyright (C) 2014 ARM Ltd.
   5  * Author: Catalin Marinas <catalin.marinas@arm.com>
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #ifndef __ASM_SYSREG_H
  21 #define __ASM_SYSREG_H
  22
  23 #include <linux/stringify.h>
  24
  25 /*
  26  * ARMv8 ARM reserves the following encoding for system registers:
  27  * (Ref: ARMv8 ARM, Section: "System instruction class encoding overview",
  28  *  C5.2, version:ARM DDI 0487A.f)
  29  *      [20-19] : Op0
  30  *      [18-16] : Op1
  31  *      [15-12] : CRn
  32  *      [11-8]  : CRm
  33  *      [7-5]   : Op2
  34  */
  35 #define sys_reg(op0, op1, crn, crm, op2) \
  36         ((((op0)&3)<<19)|((op1)<<16)|((crn)<<12)|((crm)<<8)|((op2)<<5))
  37
  38 #ifndef CONFIG_BROKEN_GAS_INST
  39
  40 #ifdef __ASSEMBLY__
  41 #define __emit_inst(x)                  .inst (x)
  42 #else
  43 #define __emit_inst(x)                  ".inst " __stringify((x)) "\n\t"
  44 #endif
  45
  46 #else  /* CONFIG_BROKEN_GAS_INST */
  47
  48 #ifndef CONFIG_CPU_BIG_ENDIAN
  49 #define __INSTR_BSWAP(x)                (x)
  50 #else  /* CONFIG_CPU_BIG_ENDIAN */
  51 #define __INSTR_BSWAP(x)                ((((x) << 24) & 0xff000000)     | \
  52                                          (((x) <<  8) & 0x00ff0000)     | \
  53                                          (((x) >>  8) & 0x0000ff00)     | \
  54                                          (((x) >> 24) & 0x000000ff))
  55 #endif  /* CONFIG_CPU_BIG_ENDIAN */
  56
  57 #ifdef __ASSEMBLY__
  58 #define __emit_inst(x)                  .long __INSTR_BSWAP(x)
  59 #else  /* __ASSEMBLY__ */
  60 #define __emit_inst(x)                  ".long " __stringify(__INSTR_BSWAP(x)) "\n\t"
  61 #endif  /* __ASSEMBLY__ */
  62
  63 #endif  /* CONFIG_BROKEN_GAS_INST */
  64
  65 #define SYS_MIDR_EL1                    sys_reg(3, 0, 0, 0, 0)
  66 #define SYS_MPIDR_EL1                   sys_reg(3, 0, 0, 0, 5)
  67 #define SYS_REVIDR_EL1                  sys_reg(3, 0, 0, 0, 6)
  68
  69 #define SYS_ID_PFR0_EL1                 sys_reg(3, 0, 0, 1, 0)
  70 #define SYS_ID_PFR1_EL1                 sys_reg(3, 0, 0, 1, 1)
  71 #define SYS_ID_DFR0_EL1                 sys_reg(3, 0, 0, 1, 2)
  72 #define SYS_ID_MMFR0_EL1                sys_reg(3, 0, 0, 1, 4)
  73 #define SYS_ID_MMFR1_EL1                sys_reg(3, 0, 0, 1, 5)
  74 #define SYS_ID_MMFR2_EL1                sys_reg(3, 0, 0, 1, 6)
  75 #define SYS_ID_MMFR3_EL1                sys_reg(3, 0, 0, 1, 7)
  76
  77 #define SYS_ID_ISAR0_EL1                sys_reg(3, 0, 0, 2, 0)
  78 #define SYS_ID_ISAR1_EL1                sys_reg(3, 0, 0, 2, 1)
  79 #define SYS_ID_ISAR2_EL1                sys_reg(3, 0, 0, 2, 2)
  80 #define SYS_ID_ISAR3_EL1                sys_reg(3, 0, 0, 2, 3)
  81 #define SYS_ID_ISAR4_EL1                sys_reg(3, 0, 0, 2, 4)
  82 #define SYS_ID_ISAR5_EL1                sys_reg(3, 0, 0, 2, 5)
  83 #define SYS_ID_MMFR4_EL1                sys_reg(3, 0, 0, 2, 6)
  84
  85 #define SYS_MVFR0_EL1                   sys_reg(3, 0, 0, 3, 0)
  86 #define SYS_MVFR1_EL1                   sys_reg(3, 0, 0, 3, 1)
  87 #define SYS_MVFR2_EL1                   sys_reg(3, 0, 0, 3, 2)
  88
  89 #define SYS_ID_AA64PFR0_EL1             sys_reg(3, 0, 0, 4, 0)
  90 #define SYS_ID_AA64PFR1_EL1             sys_reg(3, 0, 0, 4, 1)
  91
  92 #define SYS_ID_AA64DFR0_EL1             sys_reg(3, 0, 0, 5, 0)
  93 #define SYS_ID_AA64DFR1_EL1             sys_reg(3, 0, 0, 5, 1)
  94
  95 #define SYS_ID_AA64ISAR0_EL1            sys_reg(3, 0, 0, 6, 0)
  96 #define SYS_ID_AA64ISAR1_EL1            sys_reg(3, 0, 0, 6, 1)
  97
  98 #define SYS_ID_AA64MMFR0_EL1            sys_reg(3, 0, 0, 7, 0)
  99 #define SYS_ID_AA64MMFR1_EL1            sys_reg(3, 0, 0, 7, 1)
 100 #define SYS_ID_AA64MMFR2_EL1            sys_reg(3, 0, 0, 7, 2)
 101
 102 #define SYS_CNTFRQ_EL0                  sys_reg(3, 3, 14, 0, 0)
 103 #define SYS_CTR_EL0                     sys_reg(3, 3, 0, 0, 1)
 104 #define SYS_DCZID_EL0                   sys_reg(3, 3, 0, 0, 7)
 105
 106 #define REG_PSTATE_PAN_IMM              sys_reg(0, 0, 4, 0, 4)
 107 #define REG_PSTATE_UAO_IMM              sys_reg(0, 0, 4, 0, 3)
 108
 109 #define SET_PSTATE_PAN(x) __emit_inst(0xd5000000 | REG_PSTATE_PAN_IMM | \
 110                                       (!!x)<<8 | 0x1f)
 111 #define SET_PSTATE_UAO(x) __emit_inst(0xd5000000 | REG_PSTATE_UAO_IMM | \
 112                                       (!!x)<<8 | 0x1f)
 113
 114 /* Common SCTLR_ELx flags. */
 115 #define SCTLR_ELx_EE    (1 << 25)
 116 #define SCTLR_ELx_I     (1 << 12)
 117 #define SCTLR_ELx_SA    (1 << 3)
 118 #define SCTLR_ELx_C     (1 << 2)
 119 #define SCTLR_ELx_A     (1 << 1)
 120 #define SCTLR_ELx_M     1
 121
 122 #define SCTLR_ELx_FLAGS (SCTLR_ELx_M | SCTLR_ELx_A | SCTLR_ELx_C | \
 123                          SCTLR_ELx_SA | SCTLR_ELx_I)
 124
 125 /* SCTLR_EL1 specific flags. */
 126 #define SCTLR_EL1_UCI           (1 << 26)
 127 #define SCTLR_EL1_SPAN          (1 << 23)
 128 #define SCTLR_EL1_UCT           (1 << 15)
 129 #define SCTLR_EL1_SED           (1 << 8)
 130 #define SCTLR_EL1_CP15BEN       (1 << 5)
 131
 132 /* id_aa64isar0 */
 133 #define ID_AA64ISAR0_RDM_SHIFT          28
 134 #define ID_AA64ISAR0_ATOMICS_SHIFT      20
 135 #define ID_AA64ISAR0_CRC32_SHIFT        16
 136 #define ID_AA64ISAR0_SHA2_SHIFT         12
 137 #define ID_AA64ISAR0_SHA1_SHIFT         8
 138 #define ID_AA64ISAR0_AES_SHIFT          4
 139
 140 /* id_aa64pfr0 */
 141 #define ID_AA64PFR0_GIC_SHIFT           24
 142 #define ID_AA64PFR0_ASIMD_SHIFT         20
 143 #define ID_AA64PFR0_FP_SHIFT            16
 144 #define ID_AA64PFR0_EL3_SHIFT           12
 145 #define ID_AA64PFR0_EL2_SHIFT           8
 146 #define ID_AA64PFR0_EL1_SHIFT           4
 147 #define ID_AA64PFR0_EL0_SHIFT           0
 148
 149 #define ID_AA64PFR0_FP_NI               0xf
 150 #define ID_AA64PFR0_FP_SUPPORTED        0x0
 151 #define ID_AA64PFR0_ASIMD_NI            0xf
 152 #define ID_AA64PFR0_ASIMD_SUPPORTED     0x0
 153 #define ID_AA64PFR0_EL1_64BIT_ONLY      0x1
 154 #define ID_AA64PFR0_EL0_64BIT_ONLY      0x1
 155 #define ID_AA64PFR0_EL0_32BIT_64BIT     0x2
 156
 157 /* id_aa64mmfr0 */
 158 #define ID_AA64MMFR0_TGRAN4_SHIFT       28
 159 #define ID_AA64MMFR0_TGRAN64_SHIFT      24
 160 #define ID_AA64MMFR0_TGRAN16_SHIFT      20
 161 #define ID_AA64MMFR0_BIGENDEL0_SHIFT    16
 162 #define ID_AA64MMFR0_SNSMEM_SHIFT       12
 163 #define ID_AA64MMFR0_BIGENDEL_SHIFT     8
 164 #define ID_AA64MMFR0_ASID_SHIFT         4
 165 #define ID_AA64MMFR0_PARANGE_SHIFT      0
 166
 167 #define ID_AA64MMFR0_TGRAN4_NI          0xf
 168 #define ID_AA64MMFR0_TGRAN4_SUPPORTED   0x0
 169 #define ID_AA64MMFR0_TGRAN64_NI         0xf
 170 #define ID_AA64MMFR0_TGRAN64_SUPPORTED  0x0
 171 #define ID_AA64MMFR0_TGRAN16_NI         0x0
 172 #define ID_AA64MMFR0_TGRAN16_SUPPORTED  0x1
 173
 174 /* id_aa64mmfr1 */
 175 #define ID_AA64MMFR1_PAN_SHIFT          20
 176 #define ID_AA64MMFR1_LOR_SHIFT          16
 177 #define ID_AA64MMFR1_HPD_SHIFT          12
 178 #define ID_AA64MMFR1_VHE_SHIFT          8
 179 #define ID_AA64MMFR1_VMIDBITS_SHIFT     4
 180 #define ID_AA64MMFR1_HADBS_SHIFT        0
 181
 182 #define ID_AA64MMFR1_VMIDBITS_8         0
 183 #define ID_AA64MMFR1_VMIDBITS_16        2
 184
 185 /* id_aa64mmfr2 */
 186 #define ID_AA64MMFR2_LVA_SHIFT          16
 187 #define ID_AA64MMFR2_IESB_SHIFT         12
 188 #define ID_AA64MMFR2_LSM_SHIFT          8
 189 #define ID_AA64MMFR2_UAO_SHIFT          4
 190 #define ID_AA64MMFR2_CNP_SHIFT          0
 191
 192 /* id_aa64dfr0 */
 193 #define ID_AA64DFR0_CTX_CMPS_SHIFT      28
 194 #define ID_AA64DFR0_WRPS_SHIFT          20
 195 #define ID_AA64DFR0_BRPS_SHIFT          12
 196 #define ID_AA64DFR0_PMUVER_SHIFT        8
 197 #define ID_AA64DFR0_TRACEVER_SHIFT      4
 198 #define ID_AA64DFR0_DEBUGVER_SHIFT      0
 199
 200 #define ID_ISAR5_RDM_SHIFT              24
 201 #define ID_ISAR5_CRC32_SHIFT            16
 202 #define ID_ISAR5_SHA2_SHIFT             12
 203 #define ID_ISAR5_SHA1_SHIFT             8
 204 #define ID_ISAR5_AES_SHIFT              4
 205 #define ID_ISAR5_SEVL_SHIFT             0
 206
 207 #define MVFR0_FPROUND_SHIFT             28
 208 #define MVFR0_FPSHVEC_SHIFT             24
 209 #define MVFR0_FPSQRT_SHIFT              20
 210 #define MVFR0_FPDIVIDE_SHIFT            16
 211 #define MVFR0_FPTRAP_SHIFT              12
 212 #define MVFR0_FPDP_SHIFT                8
 213 #define MVFR0_FPSP_SHIFT                4
 214 #define MVFR0_SIMD_SHIFT                0
 215
 216 #define MVFR1_SIMDFMAC_SHIFT            28
 217 #define MVFR1_FPHP_SHIFT                24
 218 #define MVFR1_SIMDHP_SHIFT              20
 219 #define MVFR1_SIMDSP_SHIFT              16
 220 #define MVFR1_SIMDINT_SHIFT             12
 221 #define MVFR1_SIMDLS_SHIFT              8
 222 #define MVFR1_FPDNAN_SHIFT              4
 223 #define MVFR1_FPFTZ_SHIFT               0
 224
 225
 226 #define ID_AA64MMFR0_TGRAN4_SHIFT       28
 227 #define ID_AA64MMFR0_TGRAN64_SHIFT      24
 228 #define ID_AA64MMFR0_TGRAN16_SHIFT      20
 229
 230 #define ID_AA64MMFR0_TGRAN4_NI          0xf
 231 #define ID_AA64MMFR0_TGRAN4_SUPPORTED   0x0
 232 #define ID_AA64MMFR0_TGRAN64_NI         0xf
 233 #define ID_AA64MMFR0_TGRAN64_SUPPORTED  0x0
 234 #define ID_AA64MMFR0_TGRAN16_NI         0x0
 235 #define ID_AA64MMFR0_TGRAN16_SUPPORTED  0x1
 236
 237 #if defined(CONFIG_ARM64_4K_PAGES)
 238 #define ID_AA64MMFR0_TGRAN_SHIFT        ID_AA64MMFR0_TGRAN4_SHIFT
 239 #define ID_AA64MMFR0_TGRAN_SUPPORTED    ID_AA64MMFR0_TGRAN4_SUPPORTED
 240 #elif defined(CONFIG_ARM64_16K_PAGES)
 241 #define ID_AA64MMFR0_TGRAN_SHIFT        ID_AA64MMFR0_TGRAN16_SHIFT
 242 #define ID_AA64MMFR0_TGRAN_SUPPORTED    ID_AA64MMFR0_TGRAN16_SUPPORTED
 243 #elif defined(CONFIG_ARM64_64K_PAGES)
 244 #define ID_AA64MMFR0_TGRAN_SHIFT        ID_AA64MMFR0_TGRAN64_SHIFT
 245 #define ID_AA64MMFR0_TGRAN_SUPPORTED    ID_AA64MMFR0_TGRAN64_SUPPORTED
 246 #endif
 247
 248 #ifdef __ASSEMBLY__
 249
 250         .irp    num,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30
 251         .equ    .L__reg_num_x\num, \num
 252         .endr
 253         .equ    .L__reg_num_xzr, 31
 254
 255         .macro  mrs_s, rt, sreg
 256          __emit_inst(0xd5200000|(\sreg)|(.L__reg_num_\rt))
 257         .endm
 258
 259         .macro  msr_s, sreg, rt
 260         __emit_inst(0xd5000000|(\sreg)|(.L__reg_num_\rt))
 261         .endm
 262
 263 #else
 264
 265 #include <linux/types.h>
 266
 267 asm(
 268 "       .irp    num,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30\n"
 269 "       .equ    .L__reg_num_x\\num, \\num\n"
 270 "       .endr\n"
 271 "       .equ    .L__reg_num_xzr, 31\n"
 272 "\n"
 273 "       .macro  mrs_s, rt, sreg\n"
 274         __emit_inst(0xd5200000|(\\sreg)|(.L__reg_num_\\rt))
 275 "       .endm\n"
 276 "\n"
 277 "       .macro  msr_s, sreg, rt\n"
 278         __emit_inst(0xd5000000|(\\sreg)|(.L__reg_num_\\rt))
 279 "       .endm\n"
 280 );
 281
 282 /*
 283  * Unlike read_cpuid, calls to read_sysreg are never expected to be
 284  * optimized away or replaced with synthetic values.
 285  */
 286 #define read_sysreg(r) ({                                       \
 287         u64 __val;                                              \
 288         asm volatile("mrs %0, " __stringify(r) : "=r" (__val)); \
 289         __val;                                                  \
 290 })
 291
 292 /*
 293  * The "Z" constraint normally means a zero immediate, but when combined with
 294  * the "%x0" template means XZR.
 295  */
 296 #define write_sysreg(v, r) do {                                 \
 297         u64 __val = (u64)v;                                     \
 298         asm volatile("msr " __stringify(r) ", %x0"              \
 299                      : : "rZ" (__val));                         \
 300 } while (0)
 301
 302 /*
 303  * For registers without architectural names, or simply unsupported by
 304  * GAS.
 305  */
 306 #define read_sysreg_s(r) ({                                             \
 307         u64 __val;                                                      \
 308         asm volatile("mrs_s %0, " __stringify(r) : "=r" (__val));       \
 309         __val;                                                          \
 310 })
 311
 312 #define write_sysreg_s(v, r) do {                                       \
 313         u64 __val = (u64)v;                                             \
 314         asm volatile("msr_s " __stringify(r) ", %x0" : : "rZ" (__val)); \
 315 } while (0)
 316
 317 static inline void config_sctlr_el1(u32 clear, u32 set)
 318 {
 319         u32 val;
 320
 321         val = read_sysreg(sctlr_el1);
 322         val &= ~clear;
 323         val |= set;
 324         write_sysreg(val, sctlr_el1);
 325 }
 326
 327 #endif
 328
 329 #endif  /* __ASM_SYSREG_H */