target/microblaze/cpu.h

   1 /*
   2  *  MicroBlaze virtual CPU header
   3  *
   4  *  Copyright (c) 2009 Edgar E. Iglesias
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library 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 GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #ifndef MICROBLAZE_CPU_H
  21 #define MICROBLAZE_CPU_H
  22
  23 #include "cpu-qom.h"
  24 #include "exec/cpu-defs.h"
  25 #include "qemu/cpu-float.h"
  26
  27 typedef struct CPUArchState CPUMBState;
  28 #if !defined(CONFIG_USER_ONLY)
  29 #include "mmu.h"
  30 #endif
  31
  32 #define EXCP_MMU        1
  33 #define EXCP_IRQ        2
  34 #define EXCP_SYSCALL    3  /* user-only */
  35 #define EXCP_HW_BREAK   4
  36 #define EXCP_HW_EXCP    5
  37
  38 /* MicroBlaze-specific interrupt pending bits.  */
  39 #define CPU_INTERRUPT_NMI       CPU_INTERRUPT_TGT_EXT_3
  40
  41 /* Meanings of the MBCPU object's two inbound GPIO lines */
  42 #define MB_CPU_IRQ 0
  43 #define MB_CPU_FIR 1
  44
  45 /* Register aliases. R0 - R15 */
  46 #define R_SP     1
  47 #define SR_PC    0
  48 #define SR_MSR   1
  49 #define SR_EAR   3
  50 #define SR_ESR   5
  51 #define SR_FSR   7
  52 #define SR_BTR   0xb
  53 #define SR_EDR   0xd
  54
  55 /* MSR flags.  */
  56 #define MSR_BE  (1<<0) /* 0x001 */
  57 #define MSR_IE  (1<<1) /* 0x002 */
  58 #define MSR_C   (1<<2) /* 0x004 */
  59 #define MSR_BIP (1<<3) /* 0x008 */
  60 #define MSR_FSL (1<<4) /* 0x010 */
  61 #define MSR_ICE (1<<5) /* 0x020 */
  62 #define MSR_DZ  (1<<6) /* 0x040 */
  63 #define MSR_DCE (1<<7) /* 0x080 */
  64 #define MSR_EE  (1<<8) /* 0x100 */
  65 #define MSR_EIP (1<<9) /* 0x200 */
  66 #define MSR_PVR (1<<10) /* 0x400 */
  67 #define MSR_CC  (1<<31)
  68
  69 /* Machine State Register (MSR) Fields */
  70 #define MSR_UM (1<<11) /* User Mode */
  71 #define MSR_UMS        (1<<12) /* User Mode Save */
  72 #define MSR_VM (1<<13) /* Virtual Mode */
  73 #define MSR_VMS        (1<<14) /* Virtual Mode Save */
  74
  75 #define MSR_KERNEL      MSR_EE|MSR_VM
  76 //#define MSR_USER     MSR_KERNEL|MSR_UM|MSR_IE
  77 #define MSR_KERNEL_VMS  MSR_EE|MSR_VMS
  78 //#define MSR_USER_VMS MSR_KERNEL_VMS|MSR_UMS|MSR_IE
  79
  80 /* Exception State Register (ESR) Fields */
  81 #define          ESR_DIZ       (1<<11) /* Zone Protection */
  82 #define          ESR_W         (1<<11) /* Unaligned word access */
  83 #define          ESR_S         (1<<10) /* Store instruction */
  84
  85 #define          ESR_ESS_FSL_OFFSET     5
  86
  87 #define          ESR_ESS_MASK  (0x7f << 5)
  88
  89 #define          ESR_EC_FSL             0
  90 #define          ESR_EC_UNALIGNED_DATA  1
  91 #define          ESR_EC_ILLEGAL_OP      2
  92 #define          ESR_EC_INSN_BUS        3
  93 #define          ESR_EC_DATA_BUS        4
  94 #define          ESR_EC_DIVZERO         5
  95 #define          ESR_EC_FPU             6
  96 #define          ESR_EC_PRIVINSN        7
  97 #define          ESR_EC_STACKPROT       7  /* Same as PRIVINSN.  */
  98 #define          ESR_EC_DATA_STORAGE    8
  99 #define          ESR_EC_INSN_STORAGE    9
 100 #define          ESR_EC_DATA_TLB        10
 101 #define          ESR_EC_INSN_TLB        11
 102 #define          ESR_EC_MASK            31
 103
 104 /* Floating Point Status Register (FSR) Bits */
 105 #define FSR_IO          (1<<4) /* Invalid operation */
 106 #define FSR_DZ          (1<<3) /* Divide-by-zero */
 107 #define FSR_OF          (1<<2) /* Overflow */
 108 #define FSR_UF          (1<<1) /* Underflow */
 109 #define FSR_DO          (1<<0) /* Denormalized operand error */
 110
 111 /* Version reg.  */
 112 /* Basic PVR mask */
 113 #define PVR0_PVR_FULL_MASK              0x80000000
 114 #define PVR0_USE_BARREL_MASK            0x40000000
 115 #define PVR0_USE_DIV_MASK               0x20000000
 116 #define PVR0_USE_HW_MUL_MASK            0x10000000
 117 #define PVR0_USE_FPU_MASK               0x08000000
 118 #define PVR0_USE_EXC_MASK               0x04000000
 119 #define PVR0_USE_ICACHE_MASK            0x02000000
 120 #define PVR0_USE_DCACHE_MASK            0x01000000
 121 #define PVR0_USE_MMU_MASK               0x00800000
 122 #define PVR0_USE_BTC                    0x00400000
 123 #define PVR0_ENDI_MASK                  0x00200000
 124 #define PVR0_FAULT                      0x00100000
 125 #define PVR0_VERSION_MASK               0x0000FF00
 126 #define PVR0_USER1_MASK                 0x000000FF
 127 #define PVR0_SPROT_MASK                 0x00000001
 128
 129 #define PVR0_VERSION_SHIFT              8
 130
 131 /* User 2 PVR mask */
 132 #define PVR1_USER2_MASK                 0xFFFFFFFF
 133
 134 /* Configuration PVR masks */
 135 #define PVR2_D_OPB_MASK                 0x80000000
 136 #define PVR2_D_LMB_MASK                 0x40000000
 137 #define PVR2_I_OPB_MASK                 0x20000000
 138 #define PVR2_I_LMB_MASK                 0x10000000
 139 #define PVR2_INTERRUPT_IS_EDGE_MASK     0x08000000
 140 #define PVR2_EDGE_IS_POSITIVE_MASK      0x04000000
 141 #define PVR2_D_PLB_MASK                 0x02000000      /* new */
 142 #define PVR2_I_PLB_MASK                 0x01000000      /* new */
 143 #define PVR2_INTERCONNECT               0x00800000      /* new */
 144 #define PVR2_USE_EXTEND_FSL             0x00080000      /* new */
 145 #define PVR2_USE_FSL_EXC                0x00040000      /* new */
 146 #define PVR2_USE_MSR_INSTR              0x00020000
 147 #define PVR2_USE_PCMP_INSTR             0x00010000
 148 #define PVR2_AREA_OPTIMISED             0x00008000
 149 #define PVR2_USE_BARREL_MASK            0x00004000
 150 #define PVR2_USE_DIV_MASK               0x00002000
 151 #define PVR2_USE_HW_MUL_MASK            0x00001000
 152 #define PVR2_USE_FPU_MASK               0x00000800
 153 #define PVR2_USE_MUL64_MASK             0x00000400
 154 #define PVR2_USE_FPU2_MASK              0x00000200      /* new */
 155 #define PVR2_USE_IPLBEXC                0x00000100
 156 #define PVR2_USE_DPLBEXC                0x00000080
 157 #define PVR2_OPCODE_0x0_ILL_MASK        0x00000040
 158 #define PVR2_UNALIGNED_EXC_MASK         0x00000020
 159 #define PVR2_ILL_OPCODE_EXC_MASK        0x00000010
 160 #define PVR2_IOPB_BUS_EXC_MASK          0x00000008
 161 #define PVR2_DOPB_BUS_EXC_MASK          0x00000004
 162 #define PVR2_DIV_ZERO_EXC_MASK          0x00000002
 163 #define PVR2_FPU_EXC_MASK               0x00000001
 164
 165 /* Debug and exception PVR masks */
 166 #define PVR3_DEBUG_ENABLED_MASK         0x80000000
 167 #define PVR3_NUMBER_OF_PC_BRK_MASK      0x1E000000
 168 #define PVR3_NUMBER_OF_RD_ADDR_BRK_MASK 0x00380000
 169 #define PVR3_NUMBER_OF_WR_ADDR_BRK_MASK 0x0000E000
 170 #define PVR3_FSL_LINKS_MASK             0x00000380
 171
 172 /* ICache config PVR masks */
 173 #define PVR4_USE_ICACHE_MASK            0x80000000
 174 #define PVR4_ICACHE_ADDR_TAG_BITS_MASK  0x7C000000
 175 #define PVR4_ICACHE_USE_FSL_MASK        0x02000000
 176 #define PVR4_ICACHE_ALLOW_WR_MASK       0x01000000
 177 #define PVR4_ICACHE_LINE_LEN_MASK       0x00E00000
 178 #define PVR4_ICACHE_BYTE_SIZE_MASK      0x001F0000
 179
 180 /* DCache config PVR masks */
 181 #define PVR5_USE_DCACHE_MASK            0x80000000
 182 #define PVR5_DCACHE_ADDR_TAG_BITS_MASK  0x7C000000
 183 #define PVR5_DCACHE_USE_FSL_MASK        0x02000000
 184 #define PVR5_DCACHE_ALLOW_WR_MASK       0x01000000
 185 #define PVR5_DCACHE_LINE_LEN_MASK       0x00E00000
 186 #define PVR5_DCACHE_BYTE_SIZE_MASK      0x001F0000
 187 #define PVR5_DCACHE_WRITEBACK_MASK      0x00004000
 188
 189 /* ICache base address PVR mask */
 190 #define PVR6_ICACHE_BASEADDR_MASK       0xFFFFFFFF
 191
 192 /* ICache high address PVR mask */
 193 #define PVR7_ICACHE_HIGHADDR_MASK       0xFFFFFFFF
 194
 195 /* DCache base address PVR mask */
 196 #define PVR8_DCACHE_BASEADDR_MASK       0xFFFFFFFF
 197
 198 /* DCache high address PVR mask */
 199 #define PVR9_DCACHE_HIGHADDR_MASK       0xFFFFFFFF
 200
 201 /* Target family PVR mask */
 202 #define PVR10_TARGET_FAMILY_MASK        0xFF000000
 203 #define PVR10_ASIZE_SHIFT               18
 204
 205 /* MMU descrtiption */
 206 #define PVR11_USE_MMU                   0xC0000000
 207 #define PVR11_MMU_ITLB_SIZE             0x38000000
 208 #define PVR11_MMU_DTLB_SIZE             0x07000000
 209 #define PVR11_MMU_TLB_ACCESS            0x00C00000
 210 #define PVR11_MMU_ZONES                 0x003E0000
 211 /* MSR Reset value PVR mask */
 212 #define PVR11_MSR_RESET_VALUE_MASK      0x000007FF
 213
 214 #define C_PVR_NONE                      0
 215 #define C_PVR_BASIC                     1
 216 #define C_PVR_FULL                      2
 217
 218 /* CPU flags.  */
 219
 220 /* Condition codes.  */
 221 #define CC_GE  5
 222 #define CC_GT  4
 223 #define CC_LE  3
 224 #define CC_LT  2
 225 #define CC_NE  1
 226 #define CC_EQ  0
 227
 228 #define STREAM_EXCEPTION (1 << 0)
 229 #define STREAM_ATOMIC    (1 << 1)
 230 #define STREAM_TEST      (1 << 2)
 231 #define STREAM_CONTROL   (1 << 3)
 232 #define STREAM_NONBLOCK  (1 << 4)
 233
 234 #define TARGET_INSN_START_EXTRA_WORDS 1
 235
 236 /* use-non-secure property masks */
 237 #define USE_NON_SECURE_M_AXI_DP_MASK 0x1
 238 #define USE_NON_SECURE_M_AXI_IP_MASK 0x2
 239 #define USE_NON_SECURE_M_AXI_DC_MASK 0x4
 240 #define USE_NON_SECURE_M_AXI_IC_MASK 0x8
 241
 242 struct CPUArchState {
 243     uint32_t bvalue;   /* TCG temporary, only valid during a TB */
 244     uint32_t btarget;  /* Full resolved branch destination */
 245
 246     uint32_t imm;
 247     uint32_t regs[32];
 248     uint32_t pc;
 249     uint32_t msr;    /* All bits of MSR except MSR[C] and MSR[CC] */
 250     uint32_t msr_c;  /* MSR[C], in low bit; other bits must be 0 */
 251     target_ulong ear;
 252     uint32_t esr;
 253     uint32_t fsr;
 254     uint32_t btr;
 255     uint32_t edr;
 256     float_status fp_status;
 257     /* Stack protectors. Yes, it's a hw feature.  */
 258     uint32_t slr, shr;
 259
 260     /* lwx/swx reserved address */
 261 #define RES_ADDR_NONE 0xffffffff /* Use 0xffffffff to indicate no reservation */
 262     target_ulong res_addr;
 263     uint32_t res_val;
 264
 265     /* Internal flags.  */
 266 #define IMM_FLAG        (1 << 0)
 267 #define BIMM_FLAG       (1 << 1)
 268 #define ESR_ESS_FLAG    (1 << 2)  /* indicates ESR_ESS_MASK is present */
 269 /* MSR_EE               (1 << 8)  -- these 3 are not in iflags but tb_flags */
 270 /* MSR_UM               (1 << 11) */
 271 /* MSR_VM               (1 << 13) */
 272 /* ESR_ESS_MASK         [11:5]    -- unwind into iflags for unaligned excp */
 273 #define D_FLAG          (1 << 12)  /* Bit in ESR.  */
 274 #define DRTI_FLAG       (1 << 16)
 275 #define DRTE_FLAG       (1 << 17)
 276 #define DRTB_FLAG       (1 << 18)
 277
 278 /* TB dependent CPUMBState.  */
 279 #define IFLAGS_TB_MASK  (D_FLAG | BIMM_FLAG | IMM_FLAG | \
 280                          DRTI_FLAG | DRTE_FLAG | DRTB_FLAG)
 281 #define MSR_TB_MASK     (MSR_UM | MSR_VM | MSR_EE)
 282
 283     uint32_t iflags;
 284
 285 #if !defined(CONFIG_USER_ONLY)
 286     /* Unified MMU.  */
 287     MicroBlazeMMU mmu;
 288 #endif
 289
 290     /* Fields up to this point are cleared by a CPU reset */
 291     struct {} end_reset_fields;
 292
 293     /* These fields are preserved on reset.  */
 294 };
 295
 296 /*
 297  * Microblaze Configuration Settings
 298  *
 299  * Note that the structure is sorted by type and size to minimize holes.
 300  */
 301 typedef struct {
 302     char *version;
 303
 304     uint64_t addr_mask;
 305
 306     uint32_t base_vectors;
 307     uint32_t pvr_user2;
 308     uint32_t pvr_regs[13];
 309
 310     uint8_t addr_size;
 311     uint8_t use_fpu;
 312     uint8_t use_hw_mul;
 313     uint8_t pvr_user1;
 314     uint8_t pvr;
 315     uint8_t mmu;
 316     uint8_t mmu_tlb_access;
 317     uint8_t mmu_zones;
 318
 319     bool stackprot;
 320     bool use_barrel;
 321     bool use_div;
 322     bool use_msr_instr;
 323     bool use_pcmp_instr;
 324     bool use_mmu;
 325     uint8_t use_non_secure;
 326     bool dcache_writeback;
 327     bool endi;
 328     bool dopb_bus_exception;
 329     bool iopb_bus_exception;
 330     bool illegal_opcode_exception;
 331     bool opcode_0_illegal;
 332     bool div_zero_exception;
 333     bool unaligned_exceptions;
 334 } MicroBlazeCPUConfig;
 335
 336 /**
 337  * MicroBlazeCPU:
 338  * @env: #CPUMBState
 339  *
 340  * A MicroBlaze CPU.
 341  */
 342 struct ArchCPU {
 343     /*< private >*/
 344     CPUState parent_obj;
 345
 346     /*< public >*/
 347     bool ns_axi_dp;
 348     bool ns_axi_ip;
 349     bool ns_axi_dc;
 350     bool ns_axi_ic;
 351
 352     CPUNegativeOffsetState neg;
 353     CPUMBState env;
 354     MicroBlazeCPUConfig cfg;
 355 };
 356
 357
 358 #ifndef CONFIG_USER_ONLY
 359 void mb_cpu_do_interrupt(CPUState *cs);
 360 bool mb_cpu_exec_interrupt(CPUState *cs, int int_req);
 361 hwaddr mb_cpu_get_phys_page_attrs_debug(CPUState *cpu, vaddr addr,
 362                                         MemTxAttrs *attrs);
 363 #endif /* !CONFIG_USER_ONLY */
 364 G_NORETURN void mb_cpu_do_unaligned_access(CPUState *cs, vaddr vaddr,
 365                                            MMUAccessType access_type,
 366                                            int mmu_idx, uintptr_t retaddr);
 367 void mb_cpu_dump_state(CPUState *cpu, FILE *f, int flags);
 368 int mb_cpu_gdb_read_register(CPUState *cpu, GByteArray *buf, int reg);
 369 int mb_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);
 370 int mb_cpu_gdb_read_stack_protect(CPUArchState *cpu, GByteArray *buf, int reg);
 371 int mb_cpu_gdb_write_stack_protect(CPUArchState *cpu, uint8_t *buf, int reg);
 372
 373 static inline uint32_t mb_cpu_read_msr(const CPUMBState *env)
 374 {
 375     /* Replicate MSR[C] to MSR[CC]. */
 376     return env->msr | (env->msr_c * (MSR_C | MSR_CC));
 377 }
 378
 379 static inline void mb_cpu_write_msr(CPUMBState *env, uint32_t val)
 380 {
 381     env->msr_c = (val >> 2) & 1;
 382     /*
 383      * Clear both MSR[C] and MSR[CC] from the saved copy.
 384      * MSR_PVR is not writable and is always clear.
 385      */
 386     env->msr = val & ~(MSR_C | MSR_CC | MSR_PVR);
 387 }
 388
 389 void mb_tcg_init(void);
 390
 391 #define CPU_RESOLVING_TYPE TYPE_MICROBLAZE_CPU
 392
 393 /* MMU modes definitions */
 394 #define MMU_NOMMU_IDX   0
 395 #define MMU_KERNEL_IDX  1
 396 #define MMU_USER_IDX    2
 397 /* See NB_MMU_MODES in cpu-defs.h. */
 398
 399 #include "exec/cpu-all.h"
 400
 401 /* Ensure there is no overlap between the two masks. */
 402 QEMU_BUILD_BUG_ON(MSR_TB_MASK & IFLAGS_TB_MASK);
 403
 404 static inline void cpu_get_tb_cpu_state(CPUMBState *env, target_ulong *pc,
 405                                         target_ulong *cs_base, uint32_t *flags)
 406 {
 407     *pc = env->pc;
 408     *flags = (env->iflags & IFLAGS_TB_MASK) | (env->msr & MSR_TB_MASK);
 409     *cs_base = (*flags & IMM_FLAG ? env->imm : 0);
 410 }
 411
 412 #if !defined(CONFIG_USER_ONLY)
 413 bool mb_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
 414                      MMUAccessType access_type, int mmu_idx,
 415                      bool probe, uintptr_t retaddr);
 416
 417 void mb_cpu_transaction_failed(CPUState *cs, hwaddr physaddr, vaddr addr,
 418                                unsigned size, MMUAccessType access_type,
 419                                int mmu_idx, MemTxAttrs attrs,
 420                                MemTxResult response, uintptr_t retaddr);
 421 #endif
 422
 423 static inline int cpu_mmu_index(CPUMBState *env, bool ifetch)
 424 {
 425     MicroBlazeCPU *cpu = env_archcpu(env);
 426
 427     /* Are we in nommu mode?.  */
 428     if (!(env->msr & MSR_VM) || !cpu->cfg.use_mmu) {
 429         return MMU_NOMMU_IDX;
 430     }
 431
 432     if (env->msr & MSR_UM) {
 433         return MMU_USER_IDX;
 434     }
 435     return MMU_KERNEL_IDX;
 436 }
 437
 438 #ifndef CONFIG_USER_ONLY
 439 extern const VMStateDescription vmstate_mb_cpu;
 440 #endif
 441
 442 #endif