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 2.1 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 "cpu-qom.h"
  25 #include "exec/cpu-defs.h"
  26
  27 #define EXCP_NMI        1
  28 #define EXCP_GURU       2
  29 #define EXCP_BUSFAULT   3
  30 #define EXCP_IRQ        4
  31 #define EXCP_BREAK      5
  32
  33 /* CRIS-specific interrupt pending bits.  */
  34 #define CPU_INTERRUPT_NMI       CPU_INTERRUPT_TGT_EXT_3
  35
  36 /* CRUS CPU device objects interrupt lines.  */
  37 /* PIC passes the vector for the IRQ as the value of it sends over qemu_irq */
  38 #define CRIS_CPU_IRQ 0
  39 #define CRIS_CPU_NMI 1
  40
  41 /* Register aliases. R0 - R15 */
  42 #define R_FP  8
  43 #define R_SP  14
  44 #define R_ACR 15
  45
  46 /* Support regs, P0 - P15  */
  47 #define PR_BZ  0
  48 #define PR_VR  1
  49 #define PR_PID 2
  50 #define PR_SRS 3
  51 #define PR_WZ  4
  52 #define PR_EXS 5
  53 #define PR_EDA 6
  54 #define PR_PREFIX 6    /* On CRISv10 P6 is reserved, we use it as prefix.  */
  55 #define PR_MOF 7
  56 #define PR_DZ  8
  57 #define PR_EBP 9
  58 #define PR_ERP 10
  59 #define PR_SRP 11
  60 #define PR_NRP 12
  61 #define PR_CCS 13
  62 #define PR_USP 14
  63 #define PRV10_BRP 14
  64 #define PR_SPC 15
  65
  66 /* CPU flags.  */
  67 #define Q_FLAG 0x80000000
  68 #define M_FLAG_V32 0x40000000
  69 #define PFIX_FLAG 0x800      /* CRISv10 Only.  */
  70 #define F_FLAG_V10 0x400
  71 #define P_FLAG_V10 0x200
  72 #define S_FLAG 0x200
  73 #define R_FLAG 0x100
  74 #define P_FLAG 0x80
  75 #define M_FLAG_V10 0x80
  76 #define U_FLAG 0x40
  77 #define I_FLAG 0x20
  78 #define X_FLAG 0x10
  79 #define N_FLAG 0x08
  80 #define Z_FLAG 0x04
  81 #define V_FLAG 0x02
  82 #define C_FLAG 0x01
  83 #define ALU_FLAGS 0x1F
  84
  85 /* Condition codes.  */
  86 #define CC_CC   0
  87 #define CC_CS   1
  88 #define CC_NE   2
  89 #define CC_EQ   3
  90 #define CC_VC   4
  91 #define CC_VS   5
  92 #define CC_PL   6
  93 #define CC_MI   7
  94 #define CC_LS   8
  95 #define CC_HI   9
  96 #define CC_GE  10
  97 #define CC_LT  11
  98 #define CC_GT  12
  99 #define CC_LE  13
 100 #define CC_A   14
 101 #define CC_P   15
 102
 103 typedef struct {
 104     uint32_t hi;
 105     uint32_t lo;
 106 } TLBSet;
 107
 108 typedef struct CPUCRISState {
 109         uint32_t regs[16];
 110         /* P0 - P15 are referred to as special registers in the docs.  */
 111         uint32_t pregs[16];
 112
 113         /* Pseudo register for the PC. Not directly accessible on CRIS.  */
 114         uint32_t pc;
 115
 116         /* Pseudo register for the kernel stack.  */
 117         uint32_t ksp;
 118
 119         /* Branch.  */
 120         int dslot;
 121         int btaken;
 122         uint32_t btarget;
 123
 124         /* Condition flag tracking.  */
 125         uint32_t cc_op;
 126         uint32_t cc_mask;
 127         uint32_t cc_dest;
 128         uint32_t cc_src;
 129         uint32_t cc_result;
 130         /* size of the operation, 1 = byte, 2 = word, 4 = dword.  */
 131         int cc_size;
 132         /* X flag at the time of cc snapshot.  */
 133         int cc_x;
 134
 135         /* CRIS has certain insns that lockout interrupts.  */
 136         int locked_irq;
 137         int interrupt_vector;
 138         int fault_vector;
 139         int trap_vector;
 140
 141         /* FIXME: add a check in the translator to avoid writing to support
 142            register sets beyond the 4th. The ISA allows up to 256! but in
 143            practice there is no core that implements more than 4.
 144
 145            Support function registers are used to control units close to the
 146            core. Accesses do not pass down the normal hierarchy.
 147         */
 148         uint32_t sregs[4][16];
 149
 150         /* Linear feedback shift reg in the mmu. Used to provide pseudo
 151            randomness for the 'hint' the mmu gives to sw for choosing valid
 152            sets on TLB refills.  */
 153         uint32_t mmu_rand_lfsr;
 154
 155         /*
 156          * We just store the stores to the tlbset here for later evaluation
 157          * when the hw needs access to them.
 158          *
 159          * One for I and another for D.
 160          */
 161         TLBSet tlbsets[2][4][16];
 162
 163         /* Fields up to this point are cleared by a CPU reset */
 164         struct {} end_reset_fields;
 165
 166         /* Members from load_info on are preserved across resets.  */
 167         void *load_info;
 168 } CPUCRISState;
 169
 170 /**
 171  * CRISCPU:
 172  * @env: #CPUCRISState
 173  *
 174  * A CRIS CPU.
 175  */
 176 struct CRISCPU {
 177     /*< private >*/
 178     CPUState parent_obj;
 179     /*< public >*/
 180
 181     CPUNegativeOffsetState neg;
 182     CPUCRISState env;
 183 };
 184
 185
 186 #ifndef CONFIG_USER_ONLY
 187 extern const VMStateDescription vmstate_cris_cpu;
 188 #endif
 189
 190 void cris_cpu_do_interrupt(CPUState *cpu);
 191 void crisv10_cpu_do_interrupt(CPUState *cpu);
 192 bool cris_cpu_exec_interrupt(CPUState *cpu, int int_req);
 193
 194 void cris_cpu_dump_state(CPUState *cs, FILE *f, int flags);
 195
 196 hwaddr cris_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
 197
 198 int crisv10_cpu_gdb_read_register(CPUState *cpu, GByteArray *buf, int reg);
 199 int cris_cpu_gdb_read_register(CPUState *cpu, GByteArray *buf, int reg);
 200 int cris_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);
 201
 202 /* you can call this signal handler from your SIGBUS and SIGSEGV
 203    signal handlers to inform the virtual CPU of exceptions. non zero
 204    is returned if the signal was handled by the virtual CPU.  */
 205 int cpu_cris_signal_handler(int host_signum, void *pinfo,
 206                            void *puc);
 207
 208 void cris_initialize_tcg(void);
 209 void cris_initialize_crisv10_tcg(void);
 210
 211 /* Instead of computing the condition codes after each CRIS instruction,
 212  * QEMU just stores one operand (called CC_SRC), the result
 213  * (called CC_DEST) and the type of operation (called CC_OP). When the
 214  * condition codes are needed, the condition codes can be calculated
 215  * using this information. Condition codes are not generated if they
 216  * are only needed for conditional branches.
 217  */
 218 enum {
 219     CC_OP_DYNAMIC, /* Use env->cc_op  */
 220     CC_OP_FLAGS,
 221     CC_OP_CMP,
 222     CC_OP_MOVE,
 223     CC_OP_ADD,
 224     CC_OP_ADDC,
 225     CC_OP_MCP,
 226     CC_OP_ADDU,
 227     CC_OP_SUB,
 228     CC_OP_SUBU,
 229     CC_OP_NEG,
 230     CC_OP_BTST,
 231     CC_OP_MULS,
 232     CC_OP_MULU,
 233     CC_OP_DSTEP,
 234     CC_OP_MSTEP,
 235     CC_OP_BOUND,
 236
 237     CC_OP_OR,
 238     CC_OP_AND,
 239     CC_OP_XOR,
 240     CC_OP_LSL,
 241     CC_OP_LSR,
 242     CC_OP_ASR,
 243     CC_OP_LZ
 244 };
 245
 246 /* CRIS uses 8k pages.  */
 247 #define MMAP_SHIFT TARGET_PAGE_BITS
 248
 249 #define CRIS_CPU_TYPE_SUFFIX "-" TYPE_CRIS_CPU
 250 #define CRIS_CPU_TYPE_NAME(name) (name CRIS_CPU_TYPE_SUFFIX)
 251 #define CPU_RESOLVING_TYPE TYPE_CRIS_CPU
 252
 253 #define cpu_signal_handler cpu_cris_signal_handler
 254
 255 /* MMU modes definitions */
 256 #define MMU_USER_IDX 1
 257 static inline int cpu_mmu_index (CPUCRISState *env, bool ifetch)
 258 {
 259         return !!(env->pregs[PR_CCS] & U_FLAG);
 260 }
 261
 262 bool cris_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
 263                        MMUAccessType access_type, int mmu_idx,
 264                        bool probe, uintptr_t retaddr);
 265
 266 /* Support function regs.  */
 267 #define SFR_RW_GC_CFG      0][0
 268 #define SFR_RW_MM_CFG      env->pregs[PR_SRS]][0
 269 #define SFR_RW_MM_KBASE_LO env->pregs[PR_SRS]][1
 270 #define SFR_RW_MM_KBASE_HI env->pregs[PR_SRS]][2
 271 #define SFR_R_MM_CAUSE     env->pregs[PR_SRS]][3
 272 #define SFR_RW_MM_TLB_SEL  env->pregs[PR_SRS]][4
 273 #define SFR_RW_MM_TLB_LO   env->pregs[PR_SRS]][5
 274 #define SFR_RW_MM_TLB_HI   env->pregs[PR_SRS]][6
 275
 276 typedef CPUCRISState CPUArchState;
 277 typedef CRISCPU ArchCPU;
 278
 279 #include "exec/cpu-all.h"
 280
 281 static inline void cpu_get_tb_cpu_state(CPUCRISState *env, target_ulong *pc,
 282                                         target_ulong *cs_base, uint32_t *flags)
 283 {
 284     *pc = env->pc;
 285     *cs_base = 0;
 286     *flags = env->dslot |
 287             (env->pregs[PR_CCS] & (S_FLAG | P_FLAG | U_FLAG
 288                                      | X_FLAG | PFIX_FLAG));
 289 }
 290
 291 #define cpu_list cris_cpu_list
 292 void cris_cpu_list(void);
 293
 294 #endif