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 #ifndef CPU_CRIS_H
  21 #define CPU_CRIS_H
  22
  23 #include "config.h"
  24 #include "qemu-common.h"
  25
  26 #define TARGET_LONG_BITS 32
  27
  28 #define CPUArchState struct CPUCRISState
  29
  30 #include "exec/cpu-defs.h"
  31
  32 #define ELF_MACHINE     EM_CRIS
  33
  34 #define EXCP_NMI        1
  35 #define EXCP_GURU       2
  36 #define EXCP_BUSFAULT   3
  37 #define EXCP_IRQ        4
  38 #define EXCP_BREAK      5
  39
  40 /* CRIS-specific interrupt pending bits.  */
  41 #define CPU_INTERRUPT_NMI       CPU_INTERRUPT_TGT_EXT_3
  42
  43 /* CRUS CPU device objects interrupt lines.  */
  44 #define CRIS_CPU_IRQ 0
  45 #define CRIS_CPU_NMI 1
  46
  47 /* Register aliases. R0 - R15 */
  48 #define R_FP  8
  49 #define R_SP  14
  50 #define R_ACR 15
  51
  52 /* Support regs, P0 - P15  */
  53 #define PR_BZ  0
  54 #define PR_VR  1
  55 #define PR_PID 2
  56 #define PR_SRS 3
  57 #define PR_WZ  4
  58 #define PR_EXS 5
  59 #define PR_EDA 6
  60 #define PR_PREFIX 6    /* On CRISv10 P6 is reserved, we use it as prefix.  */
  61 #define PR_MOF 7
  62 #define PR_DZ  8
  63 #define PR_EBP 9
  64 #define PR_ERP 10
  65 #define PR_SRP 11
  66 #define PR_NRP 12
  67 #define PR_CCS 13
  68 #define PR_USP 14
  69 #define PRV10_BRP 14
  70 #define PR_SPC 15
  71
  72 /* CPU flags.  */
  73 #define Q_FLAG 0x80000000
  74 #define M_FLAG_V32 0x40000000
  75 #define PFIX_FLAG 0x800      /* CRISv10 Only.  */
  76 #define F_FLAG_V10 0x400
  77 #define P_FLAG_V10 0x200
  78 #define S_FLAG 0x200
  79 #define R_FLAG 0x100
  80 #define P_FLAG 0x80
  81 #define M_FLAG_V10 0x80
  82 #define U_FLAG 0x40
  83 #define I_FLAG 0x20
  84 #define X_FLAG 0x10
  85 #define N_FLAG 0x08
  86 #define Z_FLAG 0x04
  87 #define V_FLAG 0x02
  88 #define C_FLAG 0x01
  89 #define ALU_FLAGS 0x1F
  90
  91 /* Condition codes.  */
  92 #define CC_CC   0
  93 #define CC_CS   1
  94 #define CC_NE   2
  95 #define CC_EQ   3
  96 #define CC_VC   4
  97 #define CC_VS   5
  98 #define CC_PL   6
  99 #define CC_MI   7
 100 #define CC_LS   8
 101 #define CC_HI   9
 102 #define CC_GE  10
 103 #define CC_LT  11
 104 #define CC_GT  12
 105 #define CC_LE  13
 106 #define CC_A   14
 107 #define CC_P   15
 108
 109 #define NB_MMU_MODES 2
 110
 111 typedef struct {
 112     uint32_t hi;
 113     uint32_t lo;
 114 } TLBSet;
 115
 116 typedef struct CPUCRISState {
 117         uint32_t regs[16];
 118         /* P0 - P15 are referred to as special registers in the docs.  */
 119         uint32_t pregs[16];
 120
 121         /* Pseudo register for the PC. Not directly accessible on CRIS.  */
 122         uint32_t pc;
 123
 124         /* Pseudo register for the kernel stack.  */
 125         uint32_t ksp;
 126
 127         /* Branch.  */
 128         int dslot;
 129         int btaken;
 130         uint32_t btarget;
 131
 132         /* Condition flag tracking.  */
 133         uint32_t cc_op;
 134         uint32_t cc_mask;
 135         uint32_t cc_dest;
 136         uint32_t cc_src;
 137         uint32_t cc_result;
 138         /* size of the operation, 1 = byte, 2 = word, 4 = dword.  */
 139         int cc_size;
 140         /* X flag at the time of cc snapshot.  */
 141         int cc_x;
 142
 143         /* CRIS has certain insns that lockout interrupts.  */
 144         int locked_irq;
 145         int interrupt_vector;
 146         int fault_vector;
 147         int trap_vector;
 148
 149         /* FIXME: add a check in the translator to avoid writing to support
 150            register sets beyond the 4th. The ISA allows up to 256! but in
 151            practice there is no core that implements more than 4.
 152
 153            Support function registers are used to control units close to the
 154            core. Accesses do not pass down the normal hierarchy.
 155         */
 156         uint32_t sregs[4][16];
 157
 158         /* Linear feedback shift reg in the mmu. Used to provide pseudo
 159            randomness for the 'hint' the mmu gives to sw for choosing valid
 160            sets on TLB refills.  */
 161         uint32_t mmu_rand_lfsr;
 162
 163         /*
 164          * We just store the stores to the tlbset here for later evaluation
 165          * when the hw needs access to them.
 166          *
 167          * One for I and another for D.
 168          */
 169         TLBSet tlbsets[2][4][16];
 170
 171         CPU_COMMON
 172
 173     /* Members from load_info on are preserved across resets.  */
 174     void *load_info;
 175 } CPUCRISState;
 176
 177 #include "cpu-qom.h"
 178
 179 CRISCPU *cpu_cris_init(const char *cpu_model);
 180 int cpu_cris_exec(CPUState *cpu);
 181 /* you can call this signal handler from your SIGBUS and SIGSEGV
 182    signal handlers to inform the virtual CPU of exceptions. non zero
 183    is returned if the signal was handled by the virtual CPU.  */
 184 int cpu_cris_signal_handler(int host_signum, void *pinfo,
 185                            void *puc);
 186
 187 void cris_initialize_tcg(void);
 188 void cris_initialize_crisv10_tcg(void);
 189
 190 enum {
 191     CC_OP_DYNAMIC, /* Use env->cc_op  */
 192     CC_OP_FLAGS,
 193     CC_OP_CMP,
 194     CC_OP_MOVE,
 195     CC_OP_ADD,
 196     CC_OP_ADDC,
 197     CC_OP_MCP,
 198     CC_OP_ADDU,
 199     CC_OP_SUB,
 200     CC_OP_SUBU,
 201     CC_OP_NEG,
 202     CC_OP_BTST,
 203     CC_OP_MULS,
 204     CC_OP_MULU,
 205     CC_OP_DSTEP,
 206     CC_OP_MSTEP,
 207     CC_OP_BOUND,
 208
 209     CC_OP_OR,
 210     CC_OP_AND,
 211     CC_OP_XOR,
 212     CC_OP_LSL,
 213     CC_OP_LSR,
 214     CC_OP_ASR,
 215     CC_OP_LZ
 216 };
 217
 218 /* CRIS uses 8k pages.  */
 219 #define TARGET_PAGE_BITS 13
 220 #define MMAP_SHIFT TARGET_PAGE_BITS
 221
 222 #define TARGET_PHYS_ADDR_SPACE_BITS 32
 223 #define TARGET_VIRT_ADDR_SPACE_BITS 32
 224
 225 #define cpu_init(cpu_model) CPU(cpu_cris_init(cpu_model))
 226
 227 #define cpu_exec cpu_cris_exec
 228 #define cpu_gen_code cpu_cris_gen_code
 229 #define cpu_signal_handler cpu_cris_signal_handler
 230
 231 /* MMU modes definitions */
 232 #define MMU_MODE0_SUFFIX _kernel
 233 #define MMU_MODE1_SUFFIX _user
 234 #define MMU_USER_IDX 1
 235 static inline int cpu_mmu_index (CPUCRISState *env, bool ifetch)
 236 {
 237         return !!(env->pregs[PR_CCS] & U_FLAG);
 238 }
 239
 240 int cris_cpu_handle_mmu_fault(CPUState *cpu, vaddr address, int rw,
 241                               int mmu_idx);
 242
 243 /* Support function regs.  */
 244 #define SFR_RW_GC_CFG      0][0
 245 #define SFR_RW_MM_CFG      env->pregs[PR_SRS]][0
 246 #define SFR_RW_MM_KBASE_LO env->pregs[PR_SRS]][1
 247 #define SFR_RW_MM_KBASE_HI env->pregs[PR_SRS]][2
 248 #define SFR_R_MM_CAUSE     env->pregs[PR_SRS]][3
 249 #define SFR_RW_MM_TLB_SEL  env->pregs[PR_SRS]][4
 250 #define SFR_RW_MM_TLB_LO   env->pregs[PR_SRS]][5
 251 #define SFR_RW_MM_TLB_HI   env->pregs[PR_SRS]][6
 252
 253 #include "exec/cpu-all.h"
 254
 255 static inline void cpu_get_tb_cpu_state(CPUCRISState *env, target_ulong *pc,
 256                                         target_ulong *cs_base, int *flags)
 257 {
 258     *pc = env->pc;
 259     *cs_base = 0;
 260     *flags = env->dslot |
 261             (env->pregs[PR_CCS] & (S_FLAG | P_FLAG | U_FLAG
 262                                      | X_FLAG | PFIX_FLAG));
 263 }
 264
 265 #define cpu_list cris_cpu_list
 266 void cris_cpu_list(FILE *f, fprintf_function cpu_fprintf);
 267
 268 #include "exec/exec-all.h"
 269
 270 #endif