arch/arm/include/asm/system.h

   1 #ifndef __ASM_ARM_SYSTEM_H
   2 #define __ASM_ARM_SYSTEM_H
   3
   4 #include <common.h>
   5 #include <linux/compiler.h>
   6 #include <asm/barriers.h>
   7
   8 #ifdef CONFIG_ARM64
   9
  10 /*
  11  * SCTLR_EL1/SCTLR_EL2/SCTLR_EL3 bits definitions
  12  */
  13 #define CR_M            (1 << 0)        /* MMU enable                   */
  14 #define CR_A            (1 << 1)        /* Alignment abort enable       */
  15 #define CR_C            (1 << 2)        /* Dcache enable                */
  16 #define CR_SA           (1 << 3)        /* Stack Alignment Check Enable */
  17 #define CR_I            (1 << 12)       /* Icache enable                */
  18 #define CR_WXN          (1 << 19)       /* Write Permision Imply XN     */
  19 #define CR_EE           (1 << 25)       /* Exception (Big) Endian       */
  20
  21 #define ES_TO_AARCH64           1
  22 #define ES_TO_AARCH32           0
  23
  24 /*
  25  * SCR_EL3 bits definitions
  26  */
  27 #define SCR_EL3_RW_AARCH64      (1 << 10) /* Next lower level is AArch64     */
  28 #define SCR_EL3_RW_AARCH32      (0 << 10) /* Lower lowers level are AArch32  */
  29 #define SCR_EL3_HCE_EN          (1 << 8)  /* Hypervisor Call enable          */
  30 #define SCR_EL3_SMD_DIS         (1 << 7)  /* Secure Monitor Call disable     */
  31 #define SCR_EL3_RES1            (3 << 4)  /* Reserved, RES1                  */
  32 #define SCR_EL3_NS_EN           (1 << 0)  /* EL0 and EL1 in Non-scure state  */
  33
  34 /*
  35  * SPSR_EL3/SPSR_EL2 bits definitions
  36  */
  37 #define SPSR_EL_END_LE          (0 << 9)  /* Exception Little-endian          */
  38 #define SPSR_EL_DEBUG_MASK      (1 << 9)  /* Debug exception masked           */
  39 #define SPSR_EL_ASYN_MASK       (1 << 8)  /* Asynchronous data abort masked   */
  40 #define SPSR_EL_SERR_MASK       (1 << 8)  /* System Error exception masked    */
  41 #define SPSR_EL_IRQ_MASK        (1 << 7)  /* IRQ exception masked             */
  42 #define SPSR_EL_FIQ_MASK        (1 << 6)  /* FIQ exception masked             */
  43 #define SPSR_EL_T_A32           (0 << 5)  /* AArch32 instruction set A32      */
  44 #define SPSR_EL_M_AARCH64       (0 << 4)  /* Exception taken from AArch64     */
  45 #define SPSR_EL_M_AARCH32       (1 << 4)  /* Exception taken from AArch32     */
  46 #define SPSR_EL_M_SVC           (0x3)     /* Exception taken from SVC mode    */
  47 #define SPSR_EL_M_HYP           (0xa)     /* Exception taken from HYP mode    */
  48 #define SPSR_EL_M_EL1H          (5)       /* Exception taken from EL1h mode   */
  49 #define SPSR_EL_M_EL2H          (9)       /* Exception taken from EL2h mode   */
  50
  51 /*
  52  * CPTR_EL2 bits definitions
  53  */
  54 #define CPTR_EL2_RES1           (3 << 12 | 0x3ff)           /* Reserved, RES1 */
  55
  56 /*
  57  * SCTLR_EL2 bits definitions
  58  */
  59 #define SCTLR_EL2_RES1          (3 << 28 | 3 << 22 | 1 << 18 | 1 << 16 |\
  60                                  1 << 11 | 3 << 4)          /* Reserved, RES1 */
  61 #define SCTLR_EL2_EE_LE         (0 << 25) /* Exception Little-endian          */
  62 #define SCTLR_EL2_WXN_DIS       (0 << 19) /* Write permission is not XN       */
  63 #define SCTLR_EL2_ICACHE_DIS    (0 << 12) /* Instruction cache disabled       */
  64 #define SCTLR_EL2_SA_DIS        (0 << 3)  /* Stack Alignment Check disabled   */
  65 #define SCTLR_EL2_DCACHE_DIS    (0 << 2)  /* Data cache disabled              */
  66 #define SCTLR_EL2_ALIGN_DIS     (0 << 1)  /* Alignment check disabled         */
  67 #define SCTLR_EL2_MMU_DIS       (0)       /* MMU disabled                     */
  68
  69 /*
  70  * CNTHCTL_EL2 bits definitions
  71  */
  72 #define CNTHCTL_EL2_EL1PCEN_EN  (1 << 1)  /* Physical timer regs accessible   */
  73 #define CNTHCTL_EL2_EL1PCTEN_EN (1 << 0)  /* Physical counter accessible      */
  74
  75 /*
  76  * HCR_EL2 bits definitions
  77  */
  78 #define HCR_EL2_RW_AARCH64      (1 << 31) /* EL1 is AArch64                   */
  79 #define HCR_EL2_RW_AARCH32      (0 << 31) /* Lower levels are AArch32         */
  80 #define HCR_EL2_HCD_DIS         (1 << 29) /* Hypervisor Call disabled         */
  81
  82 /*
  83  * CPACR_EL1 bits definitions
  84  */
  85 #define CPACR_EL1_FPEN_EN       (3 << 20) /* SIMD and FP instruction enabled  */
  86
  87 /*
  88  * SCTLR_EL1 bits definitions
  89  */
  90 #define SCTLR_EL1_RES1          (3 << 28 | 3 << 22 | 1 << 20 |\
  91                                  1 << 11) /* Reserved, RES1                   */
  92 #define SCTLR_EL1_UCI_DIS       (0 << 26) /* Cache instruction disabled       */
  93 #define SCTLR_EL1_EE_LE         (0 << 25) /* Exception Little-endian          */
  94 #define SCTLR_EL1_WXN_DIS       (0 << 19) /* Write permission is not XN       */
  95 #define SCTLR_EL1_NTWE_DIS      (0 << 18) /* WFE instruction disabled         */
  96 #define SCTLR_EL1_NTWI_DIS      (0 << 16) /* WFI instruction disabled         */
  97 #define SCTLR_EL1_UCT_DIS       (0 << 15) /* CTR_EL0 access disabled          */
  98 #define SCTLR_EL1_DZE_DIS       (0 << 14) /* DC ZVA instruction disabled      */
  99 #define SCTLR_EL1_ICACHE_DIS    (0 << 12) /* Instruction cache disabled       */
 100 #define SCTLR_EL1_UMA_DIS       (0 << 9)  /* User Mask Access disabled        */
 101 #define SCTLR_EL1_SED_EN        (0 << 8)  /* SETEND instruction enabled       */
 102 #define SCTLR_EL1_ITD_EN        (0 << 7)  /* IT instruction enabled           */
 103 #define SCTLR_EL1_CP15BEN_DIS   (0 << 5)  /* CP15 barrier operation disabled  */
 104 #define SCTLR_EL1_SA0_DIS       (0 << 4)  /* Stack Alignment EL0 disabled     */
 105 #define SCTLR_EL1_SA_DIS        (0 << 3)  /* Stack Alignment EL1 disabled     */
 106 #define SCTLR_EL1_DCACHE_DIS    (0 << 2)  /* Data cache disabled              */
 107 #define SCTLR_EL1_ALIGN_DIS     (0 << 1)  /* Alignment check disabled         */
 108 #define SCTLR_EL1_MMU_DIS       (0)       /* MMU disabled                     */
 109
 110 #ifndef __ASSEMBLY__
 111
 112 u64 get_page_table_size(void);
 113 #define PGTABLE_SIZE    get_page_table_size()
 114
 115 /* 2MB granularity */
 116 #define MMU_SECTION_SHIFT       21
 117 #define MMU_SECTION_SIZE        (1 << MMU_SECTION_SHIFT)
 118
 119 /* These constants need to be synced to the MT_ types in asm/armv8/mmu.h */
 120 enum dcache_option {
 121         DCACHE_OFF = 0 << 2,
 122         DCACHE_WRITETHROUGH = 3 << 2,
 123         DCACHE_WRITEBACK = 4 << 2,
 124         DCACHE_WRITEALLOC = 4 << 2,
 125 };
 126
 127 #define wfi()                           \
 128         ({asm volatile(                 \
 129         "wfi" : : : "memory");          \
 130         })
 131
 132 static inline unsigned int current_el(void)
 133 {
 134         unsigned int el;
 135         asm volatile("mrs %0, CurrentEL" : "=r" (el) : : "cc");
 136         return el >> 2;
 137 }
 138
 139 static inline unsigned int get_sctlr(void)
 140 {
 141         unsigned int el, val;
 142
 143         el = current_el();
 144         if (el == 1)
 145                 asm volatile("mrs %0, sctlr_el1" : "=r" (val) : : "cc");
 146         else if (el == 2)
 147                 asm volatile("mrs %0, sctlr_el2" : "=r" (val) : : "cc");
 148         else
 149                 asm volatile("mrs %0, sctlr_el3" : "=r" (val) : : "cc");
 150
 151         return val;
 152 }
 153
 154 static inline void set_sctlr(unsigned int val)
 155 {
 156         unsigned int el;
 157
 158         el = current_el();
 159         if (el == 1)
 160                 asm volatile("msr sctlr_el1, %0" : : "r" (val) : "cc");
 161         else if (el == 2)
 162                 asm volatile("msr sctlr_el2, %0" : : "r" (val) : "cc");
 163         else
 164                 asm volatile("msr sctlr_el3, %0" : : "r" (val) : "cc");
 165
 166         asm volatile("isb");
 167 }
 168
 169 static inline unsigned long read_mpidr(void)
 170 {
 171         unsigned long val;
 172
 173         asm volatile("mrs %0, mpidr_el1" : "=r" (val));
 174
 175         return val;
 176 }
 177
 178 #define BSP_COREID      0
 179
 180 void __asm_flush_dcache_all(void);
 181 void __asm_invalidate_dcache_all(void);
 182 void __asm_flush_dcache_range(u64 start, u64 end);
 183
 184 /**
 185  * __asm_invalidate_dcache_range() - Invalidate a range of virtual addresses
 186  *
 187  * This performance an invalidate from @start to @end - 1. Both addresses
 188  * should be cache-aligned, otherwise this function will align the start
 189  * address and may continue past the end address.
 190  *
 191  * Data in the address range is evicted from the cache and is not written back
 192  * to memory.
 193  *
 194  * @start: Start address to invalidate
 195  * @end: End address to invalidate up to (exclusive)
 196  */
 197 void __asm_invalidate_dcache_range(u64 start, u64 end);
 198 void __asm_invalidate_tlb_all(void);
 199 void __asm_invalidate_icache_all(void);
 200 int __asm_invalidate_l3_dcache(void);
 201 int __asm_flush_l3_dcache(void);
 202 int __asm_invalidate_l3_icache(void);
 203 void __asm_switch_ttbr(u64 new_ttbr);
 204
 205 /*
 206  * Switch from EL3 to EL2 for ARMv8
 207  *
 208  * @args:        For loading 64-bit OS, fdt address.
 209  *               For loading 32-bit OS, zero.
 210  * @mach_nr:     For loading 64-bit OS, zero.
 211  *               For loading 32-bit OS, machine nr
 212  * @fdt_addr:    For loading 64-bit OS, zero.
 213  *               For loading 32-bit OS, fdt address.
 214  * @arg4:        Input argument.
 215  * @entry_point: kernel entry point
 216  * @es_flag:     execution state flag, ES_TO_AARCH64 or ES_TO_AARCH32
 217  */
 218 void __noreturn armv8_switch_to_el2(u64 args, u64 mach_nr, u64 fdt_addr,
 219                                     u64 arg4, u64 entry_point, u64 es_flag);
 220 /*
 221  * Switch from EL2 to EL1 for ARMv8
 222  *
 223  * @args:        For loading 64-bit OS, fdt address.
 224  *               For loading 32-bit OS, zero.
 225  * @mach_nr:     For loading 64-bit OS, zero.
 226  *               For loading 32-bit OS, machine nr
 227  * @fdt_addr:    For loading 64-bit OS, zero.
 228  *               For loading 32-bit OS, fdt address.
 229  * @arg4:        Input argument.
 230  * @entry_point: kernel entry point
 231  * @es_flag:     execution state flag, ES_TO_AARCH64 or ES_TO_AARCH32
 232  */
 233 void armv8_switch_to_el1(u64 args, u64 mach_nr, u64 fdt_addr,
 234                          u64 arg4, u64 entry_point, u64 es_flag);
 235 void armv8_el2_to_aarch32(u64 args, u64 mach_nr, u64 fdt_addr,
 236                           u64 arg4, u64 entry_point);
 237 void gic_init(void);
 238 void gic_send_sgi(unsigned long sgino);
 239 void wait_for_wakeup(void);
 240 void protect_secure_region(void);
 241 void smp_kick_all_cpus(void);
 242
 243 void flush_l3_cache(void);
 244 void mmu_change_region_attr(phys_addr_t start, size_t size, u64 attrs);
 245
 246 /*
 247  *Issue a secure monitor call in accordance with ARM "SMC Calling convention",
 248  * DEN0028A
 249  *
 250  * @args: input and output arguments
 251  *
 252  */
 253 void smc_call(struct pt_regs *args);
 254
 255 void __noreturn psci_system_reset(void);
 256 void __noreturn psci_system_off(void);
 257
 258 #ifdef CONFIG_ARMV8_PSCI
 259 extern char __secure_start[];
 260 extern char __secure_end[];
 261 extern char __secure_stack_start[];
 262 extern char __secure_stack_end[];
 263
 264 void armv8_setup_psci(void);
 265 void psci_setup_vectors(void);
 266 void psci_arch_init(void);
 267 #endif
 268
 269 #endif  /* __ASSEMBLY__ */
 270
 271 #else /* CONFIG_ARM64 */
 272
 273 #ifdef __KERNEL__
 274
 275 #define CPU_ARCH_UNKNOWN        0
 276 #define CPU_ARCH_ARMv3          1
 277 #define CPU_ARCH_ARMv4          2
 278 #define CPU_ARCH_ARMv4T         3
 279 #define CPU_ARCH_ARMv5          4
 280 #define CPU_ARCH_ARMv5T         5
 281 #define CPU_ARCH_ARMv5TE        6
 282 #define CPU_ARCH_ARMv5TEJ       7
 283 #define CPU_ARCH_ARMv6          8
 284 #define CPU_ARCH_ARMv7          9
 285
 286 /*
 287  * CR1 bits (CP#15 CR1)
 288  */
 289 #define CR_M    (1 << 0)        /* MMU enable                           */
 290 #define CR_A    (1 << 1)        /* Alignment abort enable               */
 291 #define CR_C    (1 << 2)        /* Dcache enable                        */
 292 #define CR_W    (1 << 3)        /* Write buffer enable                  */
 293 #define CR_P    (1 << 4)        /* 32-bit exception handler             */
 294 #define CR_D    (1 << 5)        /* 32-bit data address range            */
 295 #define CR_L    (1 << 6)        /* Implementation defined               */
 296 #define CR_B    (1 << 7)        /* Big endian                           */
 297 #define CR_S    (1 << 8)        /* System MMU protection                */
 298 #define CR_R    (1 << 9)        /* ROM MMU protection                   */
 299 #define CR_F    (1 << 10)       /* Implementation defined               */
 300 #define CR_Z    (1 << 11)       /* Implementation defined               */
 301 #define CR_I    (1 << 12)       /* Icache enable                        */
 302 #define CR_V    (1 << 13)       /* Vectors relocated to 0xffff0000      */
 303 #define CR_RR   (1 << 14)       /* Round Robin cache replacement        */
 304 #define CR_L4   (1 << 15)       /* LDR pc can set T bit                 */
 305 #define CR_DT   (1 << 16)
 306 #define CR_IT   (1 << 18)
 307 #define CR_ST   (1 << 19)
 308 #define CR_FI   (1 << 21)       /* Fast interrupt (lower latency mode)  */
 309 #define CR_U    (1 << 22)       /* Unaligned access operation           */
 310 #define CR_XP   (1 << 23)       /* Extended page tables                 */
 311 #define CR_VE   (1 << 24)       /* Vectored interrupts                  */
 312 #define CR_EE   (1 << 25)       /* Exception (Big) Endian               */
 313 #define CR_TRE  (1 << 28)       /* TEX remap enable                     */
 314 #define CR_AFE  (1 << 29)       /* Access flag enable                   */
 315 #define CR_TE   (1 << 30)       /* Thumb exception enable               */
 316
 317 #if defined(CONFIG_ARMV7_LPAE) && !defined(PGTABLE_SIZE)
 318 #define PGTABLE_SIZE            (4096 * 5)
 319 #elif !defined(PGTABLE_SIZE)
 320 #define PGTABLE_SIZE            (4096 * 4)
 321 #endif
 322
 323 /*
 324  * This is used to ensure the compiler did actually allocate the register we
 325  * asked it for some inline assembly sequences.  Apparently we can't trust
 326  * the compiler from one version to another so a bit of paranoia won't hurt.
 327  * This string is meant to be concatenated with the inline asm string and
 328  * will cause compilation to stop on mismatch.
 329  * (for details, see gcc PR 15089)
 330  */
 331 #define __asmeq(x, y)  ".ifnc " x "," y " ; .err ; .endif\n\t"
 332
 333 #ifndef __ASSEMBLY__
 334
 335 #ifdef CONFIG_ARMV7_LPAE
 336 void switch_to_hypervisor_ret(void);
 337 #endif
 338
 339 #define nop() __asm__ __volatile__("mov\tr0,r0\t@ nop\n\t");
 340
 341 #ifdef __ARM_ARCH_7A__
 342 #define wfi() __asm__ __volatile__ ("wfi" : : : "memory")
 343 #else
 344 #define wfi()
 345 #endif
 346
 347 static inline unsigned long get_cpsr(void)
 348 {
 349         unsigned long cpsr;
 350
 351         asm volatile("mrs %0, cpsr" : "=r"(cpsr): );
 352         return cpsr;
 353 }
 354
 355 static inline int is_hyp(void)
 356 {
 357 #ifdef CONFIG_ARMV7_LPAE
 358         /* HYP mode requires LPAE ... */
 359         return ((get_cpsr() & 0x1f) == 0x1a);
 360 #else
 361         /* ... so without LPAE support we can optimize all hyp code away */
 362         return 0;
 363 #endif
 364 }
 365
 366 static inline unsigned int get_cr(void)
 367 {
 368         unsigned int val;
 369
 370         if (is_hyp())
 371                 asm volatile("mrc p15, 4, %0, c1, c0, 0 @ get CR" : "=r" (val)
 372                                                                   :
 373                                                                   : "cc");
 374         else
 375                 asm volatile("mrc p15, 0, %0, c1, c0, 0 @ get CR" : "=r" (val)
 376                                                                   :
 377                                                                   : "cc");
 378         return val;
 379 }
 380
 381 static inline void set_cr(unsigned int val)
 382 {
 383         if (is_hyp())
 384                 asm volatile("mcr p15, 4, %0, c1, c0, 0 @ set CR" :
 385                                                                   : "r" (val)
 386                                                                   : "cc");
 387         else
 388                 asm volatile("mcr p15, 0, %0, c1, c0, 0 @ set CR" :
 389                                                                   : "r" (val)
 390                                                                   : "cc");
 391         isb();
 392 }
 393
 394 static inline unsigned int get_dacr(void)
 395 {
 396         unsigned int val;
 397         asm("mrc p15, 0, %0, c3, c0, 0  @ get DACR" : "=r" (val) : : "cc");
 398         return val;
 399 }
 400
 401 static inline void set_dacr(unsigned int val)
 402 {
 403         asm volatile("mcr p15, 0, %0, c3, c0, 0 @ set DACR"
 404           : : "r" (val) : "cc");
 405         isb();
 406 }
 407
 408 #ifdef CONFIG_ARMV7_LPAE
 409 /* Long-Descriptor Translation Table Level 1/2 Bits */
 410 #define TTB_SECT_XN_MASK        (1ULL << 54)
 411 #define TTB_SECT_NG_MASK        (1 << 11)
 412 #define TTB_SECT_AF             (1 << 10)
 413 #define TTB_SECT_SH_MASK        (3 << 8)
 414 #define TTB_SECT_NS_MASK        (1 << 5)
 415 #define TTB_SECT_AP             (1 << 6)
 416 /* Note: TTB AP bits are set elsewhere */
 417 #define TTB_SECT_MAIR(x)        ((x & 0x7) << 2) /* Index into MAIR */
 418 #define TTB_SECT                (1 << 0)
 419 #define TTB_PAGETABLE           (3 << 0)
 420
 421 /* TTBCR flags */
 422 #define TTBCR_EAE               (1 << 31)
 423 #define TTBCR_T0SZ(x)           ((x) << 0)
 424 #define TTBCR_T1SZ(x)           ((x) << 16)
 425 #define TTBCR_USING_TTBR0       (TTBCR_T0SZ(0) | TTBCR_T1SZ(0))
 426 #define TTBCR_IRGN0_NC          (0 << 8)
 427 #define TTBCR_IRGN0_WBWA        (1 << 8)
 428 #define TTBCR_IRGN0_WT          (2 << 8)
 429 #define TTBCR_IRGN0_WBNWA       (3 << 8)
 430 #define TTBCR_IRGN0_MASK        (3 << 8)
 431 #define TTBCR_ORGN0_NC          (0 << 10)
 432 #define TTBCR_ORGN0_WBWA        (1 << 10)
 433 #define TTBCR_ORGN0_WT          (2 << 10)
 434 #define TTBCR_ORGN0_WBNWA       (3 << 10)
 435 #define TTBCR_ORGN0_MASK        (3 << 10)
 436 #define TTBCR_SHARED_NON        (0 << 12)
 437 #define TTBCR_SHARED_OUTER      (2 << 12)
 438 #define TTBCR_SHARED_INNER      (3 << 12)
 439 #define TTBCR_EPD0              (0 << 7)
 440
 441 /*
 442  * Memory types
 443  */
 444 #define MEMORY_ATTRIBUTES       ((0x00 << (0 * 8)) | (0x88 << (1 * 8)) | \
 445                                  (0xcc << (2 * 8)) | (0xff << (3 * 8)))
 446
 447 /* options available for data cache on each page */
 448 enum dcache_option {
 449         DCACHE_OFF = TTB_SECT | TTB_SECT_MAIR(0) | TTB_SECT_XN_MASK,
 450         DCACHE_WRITETHROUGH = TTB_SECT | TTB_SECT_MAIR(1),
 451         DCACHE_WRITEBACK = TTB_SECT | TTB_SECT_MAIR(2),
 452         DCACHE_WRITEALLOC = TTB_SECT | TTB_SECT_MAIR(3),
 453 };
 454 #elif defined(CONFIG_CPU_V7)
 455 /* Short-Descriptor Translation Table Level 1 Bits */
 456 #define TTB_SECT_NS_MASK        (1 << 19)
 457 #define TTB_SECT_NG_MASK        (1 << 17)
 458 #define TTB_SECT_S_MASK         (1 << 16)
 459 /* Note: TTB AP bits are set elsewhere */
 460 #define TTB_SECT_AP             (3 << 10)
 461 #define TTB_SECT_TEX(x)         ((x & 0x7) << 12)
 462 #define TTB_SECT_DOMAIN(x)      ((x & 0xf) << 5)
 463 #define TTB_SECT_XN_MASK        (1 << 4)
 464 #define TTB_SECT_C_MASK         (1 << 3)
 465 #define TTB_SECT_B_MASK         (1 << 2)
 466 #define TTB_SECT                        (2 << 0)
 467
 468 /* options available for data cache on each page */
 469 enum dcache_option {
 470         DCACHE_OFF = TTB_SECT_DOMAIN(0) | TTB_SECT_XN_MASK | TTB_SECT,
 471         DCACHE_WRITETHROUGH = DCACHE_OFF | TTB_SECT_C_MASK,
 472         DCACHE_WRITEBACK = DCACHE_WRITETHROUGH | TTB_SECT_B_MASK,
 473         DCACHE_WRITEALLOC = DCACHE_WRITEBACK | TTB_SECT_TEX(1),
 474 };
 475 #else
 476 #define TTB_SECT_AP             (3 << 10)
 477 /* options available for data cache on each page */
 478 enum dcache_option {
 479         DCACHE_OFF = 0x12,
 480         DCACHE_WRITETHROUGH = 0x1a,
 481         DCACHE_WRITEBACK = 0x1e,
 482         DCACHE_WRITEALLOC = 0x16,
 483 };
 484 #endif
 485
 486 /* Size of an MMU section */
 487 enum {
 488 #ifdef CONFIG_ARMV7_LPAE
 489         MMU_SECTION_SHIFT       = 21, /* 2MB */
 490 #else
 491         MMU_SECTION_SHIFT       = 20, /* 1MB */
 492 #endif
 493         MMU_SECTION_SIZE        = 1 << MMU_SECTION_SHIFT,
 494 };
 495
 496 #ifdef CONFIG_CPU_V7
 497 /* TTBR0 bits */
 498 #define TTBR0_BASE_ADDR_MASK    0xFFFFC000
 499 #define TTBR0_RGN_NC                    (0 << 3)
 500 #define TTBR0_RGN_WBWA                  (1 << 3)
 501 #define TTBR0_RGN_WT                    (2 << 3)
 502 #define TTBR0_RGN_WB                    (3 << 3)
 503 /* TTBR0[6] is IRGN[0] and TTBR[0] is IRGN[1] */
 504 #define TTBR0_IRGN_NC                   (0 << 0 | 0 << 6)
 505 #define TTBR0_IRGN_WBWA                 (0 << 0 | 1 << 6)
 506 #define TTBR0_IRGN_WT                   (1 << 0 | 0 << 6)
 507 #define TTBR0_IRGN_WB                   (1 << 0 | 1 << 6)
 508 #endif
 509
 510 /**
 511  * Register an update to the page tables, and flush the TLB
 512  *
 513  * \param start         start address of update in page table
 514  * \param stop          stop address of update in page table
 515  */
 516 void mmu_page_table_flush(unsigned long start, unsigned long stop);
 517
 518 #endif /* __ASSEMBLY__ */
 519
 520 #define arch_align_stack(x) (x)
 521
 522 #endif /* __KERNEL__ */
 523
 524 #endif /* CONFIG_ARM64 */
 525
 526 #ifndef __ASSEMBLY__
 527 /**
 528  * save_boot_params() - Save boot parameters before starting reset sequence
 529  *
 530  * If you provide this function it will be called immediately U-Boot starts,
 531  * both for SPL and U-Boot proper.
 532  *
 533  * All registers are unchanged from U-Boot entry. No registers need be
 534  * preserved.
 535  *
 536  * This is not a normal C function. There is no stack. Return by branching to
 537  * save_boot_params_ret.
 538  *
 539  * void save_boot_params(u32 r0, u32 r1, u32 r2, u32 r3);
 540  */
 541
 542 /**
 543  * save_boot_params_ret() - Return from save_boot_params()
 544  *
 545  * If you provide save_boot_params(), then you should jump back to this
 546  * function when done. Try to preserve all registers.
 547  *
 548  * If your implementation of save_boot_params() is in C then it is acceptable
 549  * to simply call save_boot_params_ret() at the end of your function. Since
 550  * there is no link register set up, you cannot just exit the function. U-Boot
 551  * will return to the (initialised) value of lr, and likely crash/hang.
 552  *
 553  * If your implementation of save_boot_params() is in assembler then you
 554  * should use 'b' or 'bx' to return to save_boot_params_ret.
 555  */
 556 void save_boot_params_ret(void);
 557
 558 /**
 559  * Change the cache settings for a region.
 560  *
 561  * \param start         start address of memory region to change
 562  * \param size          size of memory region to change
 563  * \param option        dcache option to select
 564  */
 565 void mmu_set_region_dcache_behaviour(phys_addr_t start, size_t size,
 566                                      enum dcache_option option);
 567
 568 #ifdef CONFIG_SYS_NONCACHED_MEMORY
 569 void noncached_init(void);
 570 phys_addr_t noncached_alloc(size_t size, size_t align);
 571 #endif /* CONFIG_SYS_NONCACHED_MEMORY */
 572
 573 #endif /* __ASSEMBLY__ */
 574
 575 #endif