target/cris/cpu.h

   1 /*
   2  *  CRIS virtual CPU header
   3  *
   4  *  Copyright (c) 2007 AXIS Communications AB
   5  *  Written by Edgar E. Iglesias
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #ifndef CRIS_CPU_H
  22 #define CRIS_CPU_H
  23
  24 #include "qemu-common.h"
  25 #include "cpu-qom.h"
  26
  27 #define TARGET_LONG_BITS 32
  28
  29 #define CPUArchState struct CPUCRISState
  30
  31 #include "exec/cpu-defs.h"
  32
  33 #define EXCP_NMI        1
  34 #define EXCP_GURU       2
  35 #define EXCP_BUSFAULT   3
  36 #define EXCP_IRQ        4
  37 #define EXCP_BREAK      5
  38
  39 /* CRIS-specific interrupt pending bits.  */
  40 #define CPU_INTERRUPT_NMI       CPU_INTERRUPT_TGT_EXT_3
  41
  42 /* CRUS CPU device objects interrupt lines.  */
  43 #define CRIS_CPU_IRQ 0
  44 #define CRIS_CPU_NMI 1
  45
  46 /* Register aliases. R0 - R15 */
  47 #define R_FP  8
  48 #define R_SP  14
  49 #define R_ACR 15
  50
  51 /* Support regs, P0 - P15  */
  52 #define PR_BZ  0
  53 #define PR_VR  1
  54 #define PR_PID 2
  55 #define PR_SRS 3
  56 #define PR_WZ  4
  57 #define PR_EXS 5
  58 #define PR_EDA 6
  59 #define PR_PREFIX 6    /* On CRISv10 P6 is reserved, we use it as prefix.  */
  60 #define PR_MOF 7
  61 #define PR_DZ  8
  62 #define PR_EBP 9
  63 #define PR_ERP 10
  64 #define PR_SRP 11
  65 #define PR_NRP 12
  66 #define PR_CCS 13
  67 #define PR_USP 14
  68 #define PRV10_BRP 14
  69 #define PR_SPC 15
  70
  71 /* CPU flags.  */
  72 #define Q_FLAG 0x80000000
  73 #define M_FLAG_V32 0x40000000
  74 #define PFIX_FLAG 0x800      /* CRISv10 Only.  */
  75 #define F_FLAG_V10 0x400
  76 #define P_FLAG_V10 0x200
  77 #define S_FLAG 0x200
  78 #define R_FLAG 0x100
  79 #define P_FLAG 0x80
  80 #define M_FLAG_V10 0x80
  81 #define U_FLAG 0x40
  82 #define I_FLAG 0x20
  83 #define X_FLAG 0x10
  84 #define N_FLAG 0x08
  85 #define Z_FLAG 0x04
  86 #define V_FLAG 0x02
  87 #define C_FLAG 0x01
  88 #define ALU_FLAGS 0x1F
  89
  90 /* Condition codes.  */
  91 #define CC_CC   0
  92 #define CC_CS   1
  93 #define CC_NE   2
  94 #define CC_EQ   3
  95 #define CC_VC   4
  96 #define CC_VS   5
  97 #define CC_PL   6
  98 #define CC_MI   7
  99 #define CC_LS   8
 100 #define CC_HI   9
 101 #define CC_GE  10
 102 #define CC_LT  11
 103 #define CC_GT  12
 104 #define CC_LE  13
 105 #define CC_A   14
 106 #define CC_P   15
 107
 108 #define NB_MMU_MODES 2
 109
 110 typedef struct {
 111     uint32_t hi;
 112     uint32_t lo;
 113 } TLBSet;
 114
 115 typedef struct CPUCRISState {
 116         uint32_t regs[16];
 117         /* P0 - P15 are referred to as special registers in the docs.  */
 118         uint32_t pregs[16];
 119
 120         /* Pseudo register for the PC. Not directly accessible on CRIS.  */
 121         uint32_t pc;
 122
 123         /* Pseudo register for the kernel stack.  */
 124         uint32_t ksp;
 125
 126         /* Branch.  */
 127         int dslot;
 128         int btaken;
 129         uint32_t btarget;
 130
 131         /* Condition flag tracking.  */
 132         uint32_t cc_op;
 133         uint32_t cc_mask;
 134         uint32_t cc_dest;
 135         uint32_t cc_src;
 136         uint32_t cc_result;
 137         /* size of the operation, 1 = byte, 2 = word, 4 = dword.  */
 138         int cc_size;
 139         /* X flag at the time of cc snapshot.  */
 140         int cc_x;
 141
 142         /* CRIS has certain insns that lockout interrupts.  */
 143         int locked_irq;
 144         int interrupt_vector;
 145         int fault_vector;
 146         int trap_vector;
 147
 148         /* FIXME: add a check in the translator to avoid writing to support
 149            register sets beyond the 4th. The ISA allows up to 256! but in
 150            practice there is no core that implements more than 4.
 151
 152            Support function registers are used to control units close to the
 153            core. Accesses do not pass down the normal hierarchy.
 154         */
 155         uint32_t sregs[4][16];
 156
 157         /* Linear feedback shift reg in the mmu. Used to provide pseudo
 158            randomness for the 'hint' the mmu gives to sw for choosing valid
 159            sets on TLB refills.  */
 160         uint32_t mmu_rand_lfsr;
 161
 162         /*
 163          * We just store the stores to the tlbset here for later evaluation
 164          * when the hw needs access to them.
 165          *
 166          * One for I and another for D.
 167          */
 168         TLBSet tlbsets[2][4][16];
 169
 170         /* Fields up to this point are cleared by a CPU reset */
 171         struct {} end_reset_fields;
 172
 173         CPU_COMMON
 174
 175         /* Members from load_info on are preserved across resets.  */
 176         void *load_info;
 177 } CPUCRISState;
 178
 179 /**
 180  * CRISCPU:
 181  * @env: #CPUCRISState
 182  *
 183  * A CRIS CPU.
 184  */
 185 struct CRISCPU {
 186     /*< private >*/
 187     CPUState parent_obj;
 188     /*< public >*/
 189
 190     CPUCRISState env;
 191 };
 192
 193 static inline CRISCPU *cris_env_get_cpu(CPUCRISState *env)
 194 {
 195     return container_of(env, CRISCPU, env);
 196 }
 197
 198 #define ENV_GET_CPU(e) CPU(cris_env_get_cpu(e))
 199
 200 #define ENV_OFFSET offsetof(CRISCPU, env)
 201
 202 #ifndef CONFIG_USER_ONLY
 203 extern const struct VMStateDescription vmstate_cris_cpu;
 204 #endif
 205
 206 void cris_cpu_do_interrupt(CPUState *cpu);
 207 void crisv10_cpu_do_interrupt(CPUState *cpu);
 208 bool cris_cpu_exec_interrupt(CPUState *cpu, int int_req);
 209
 210 void cris_cpu_dump_state(CPUState *cs, FILE *f, fprintf_function cpu_fprintf,
 211                          int flags);
 212
 213 hwaddr cris_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
 214
 215 int crisv10_cpu_gdb_read_register(CPUState *cpu, uint8_t *buf, int reg);
 216 int cris_cpu_gdb_read_register(CPUState *cpu, uint8_t *buf, int reg);
 217 int cris_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);
 218
 219 /* you can call this signal handler from your SIGBUS and SIGSEGV
 220    signal handlers to inform the virtual CPU of exceptions. non zero
 221    is returned if the signal was handled by the virtual CPU.  */
 222 int cpu_cris_signal_handler(int host_signum, void *pinfo,
 223                            void *puc);
 224
 225 void cris_initialize_tcg(void);
 226 void cris_initialize_crisv10_tcg(void);
 227
 228 /* Instead of computing the condition codes after each CRIS instruction,
 229  * QEMU just stores one operand (called CC_SRC), the result
 230  * (called CC_DEST) and the type of operation (called CC_OP). When the
 231  * condition codes are needed, the condition codes can be calculated
 232  * using this information. Condition codes are not generated if they
 233  * are only needed for conditional branches.
 234  */
 235 enum {
 236     CC_OP_DYNAMIC, /* Use env->cc_op  */
 237     CC_OP_FLAGS,
 238     CC_OP_CMP,
 239     CC_OP_MOVE,
 240     CC_OP_ADD,
 241     CC_OP_ADDC,
 242     CC_OP_MCP,
 243     CC_OP_ADDU,
 244     CC_OP_SUB,
 245     CC_OP_SUBU,
 246     CC_OP_NEG,
 247     CC_OP_BTST,
 248     CC_OP_MULS,
 249     CC_OP_MULU,
 250     CC_OP_DSTEP,
 251     CC_OP_MSTEP,
 252     CC_OP_BOUND,
 253
 254     CC_OP_OR,
 255     CC_OP_AND,
 256     CC_OP_XOR,
 257     CC_OP_LSL,
 258     CC_OP_LSR,
 259     CC_OP_ASR,
 260     CC_OP_LZ
 261 };
 262
 263 /* CRIS uses 8k pages.  */
 264 #define TARGET_PAGE_BITS 13
 265 #define MMAP_SHIFT TARGET_PAGE_BITS
 266
 267 #define TARGET_PHYS_ADDR_SPACE_BITS 32
 268 #define TARGET_VIRT_ADDR_SPACE_BITS 32
 269
 270 #define cpu_init(cpu_model) cpu_generic_init(TYPE_CRIS_CPU, cpu_model)
 271
 272 #define CRIS_CPU_TYPE_SUFFIX "-" TYPE_CRIS_CPU
 273 #define CRIS_CPU_TYPE_NAME(name) (name CRIS_CPU_TYPE_SUFFIX)
 274
 275 #define cpu_signal_handler cpu_cris_signal_handler
 276
 277 /* MMU modes definitions */
 278 #define MMU_MODE0_SUFFIX _kernel
 279 #define MMU_MODE1_SUFFIX _user
 280 #define MMU_USER_IDX 1
 281 static inline int cpu_mmu_index (CPUCRISState *env, bool ifetch)
 282 {
 283         return !!(env->pregs[PR_CCS] & U_FLAG);
 284 }
 285
 286 int cris_cpu_handle_mmu_fault(CPUState *cpu, vaddr address, int rw,
 287                               int mmu_idx);
 288
 289 /* Support function regs.  */
 290 #define SFR_RW_GC_CFG      0][0
 291 #define SFR_RW_MM_CFG      env->pregs[PR_SRS]][0
 292 #define SFR_RW_MM_KBASE_LO env->pregs[PR_SRS]][1
 293 #define SFR_RW_MM_KBASE_HI env->pregs[PR_SRS]][2
 294 #define SFR_R_MM_CAUSE     env->pregs[PR_SRS]][3
 295 #define SFR_RW_MM_TLB_SEL  env->pregs[PR_SRS]][4
 296 #define SFR_RW_MM_TLB_LO   env->pregs[PR_SRS]][5
 297 #define SFR_RW_MM_TLB_HI   env->pregs[PR_SRS]][6
 298
 299 #include "exec/cpu-all.h"
 300
 301 static inline void cpu_get_tb_cpu_state(CPUCRISState *env, target_ulong *pc,
 302                                         target_ulong *cs_base, uint32_t *flags)
 303 {
 304     *pc = env->pc;
 305     *cs_base = 0;
 306     *flags = env->dslot |
 307             (env->pregs[PR_CCS] & (S_FLAG | P_FLAG | U_FLAG
 308                                      | X_FLAG | PFIX_FLAG));
 309 }
 310
 311 #define cpu_list cris_cpu_list
 312 void cris_cpu_list(FILE *f, fprintf_function cpu_fprintf);
 313
 314 #endif