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 "cpu-defs.h"
  31
  32 #define TARGET_HAS_ICE 1
  33
  34 #define ELF_MACHINE     EM_CRIS
  35
  36 #define EXCP_NMI        1
  37 #define EXCP_GURU       2
  38 #define EXCP_BUSFAULT   3
  39 #define EXCP_IRQ        4
  40 #define EXCP_BREAK      5
  41
  42 /* CRIS-specific interrupt pending bits.  */
  43 #define CPU_INTERRUPT_NMI       CPU_INTERRUPT_TGT_EXT_3
  44
  45 /* Register aliases. R0 - R15 */
  46 #define R_FP  8
  47 #define R_SP  14
  48 #define R_ACR 15
  49
  50 /* Support regs, P0 - P15  */
  51 #define PR_BZ  0
  52 #define PR_VR  1
  53 #define PR_PID 2
  54 #define PR_SRS 3
  55 #define PR_WZ  4
  56 #define PR_EXS 5
  57 #define PR_EDA 6
  58 #define PR_PREFIX 6    /* On CRISv10 P6 is reserved, we use it as prefix.  */
  59 #define PR_MOF 7
  60 #define PR_DZ  8
  61 #define PR_EBP 9
  62 #define PR_ERP 10
  63 #define PR_SRP 11
  64 #define PR_NRP 12
  65 #define PR_CCS 13
  66 #define PR_USP 14
  67 #define PR_SPC 15
  68
  69 /* CPU flags.  */
  70 #define Q_FLAG 0x80000000
  71 #define M_FLAG 0x40000000
  72 #define PFIX_FLAG 0x800      /* CRISv10 Only.  */
  73 #define F_FLAG_V10 0x400
  74 #define P_FLAG_V10 0x200
  75 #define S_FLAG 0x200
  76 #define R_FLAG 0x100
  77 #define P_FLAG 0x80
  78 #define U_FLAG 0x40
  79 #define I_FLAG 0x20
  80 #define X_FLAG 0x10
  81 #define N_FLAG 0x08
  82 #define Z_FLAG 0x04
  83 #define V_FLAG 0x02
  84 #define C_FLAG 0x01
  85 #define ALU_FLAGS 0x1F
  86
  87 /* Condition codes.  */
  88 #define CC_CC   0
  89 #define CC_CS   1
  90 #define CC_NE   2
  91 #define CC_EQ   3
  92 #define CC_VC   4
  93 #define CC_VS   5
  94 #define CC_PL   6
  95 #define CC_MI   7
  96 #define CC_LS   8
  97 #define CC_HI   9
  98 #define CC_GE  10
  99 #define CC_LT  11
 100 #define CC_GT  12
 101 #define CC_LE  13
 102 #define CC_A   14
 103 #define CC_P   15
 104
 105 #define NB_MMU_MODES 2
 106
 107 typedef struct CPUCRISState {
 108         uint32_t regs[16];
 109         /* P0 - P15 are referred to as special registers in the docs.  */
 110         uint32_t pregs[16];
 111
 112         /* Pseudo register for the PC. Not directly accessible on CRIS.  */
 113         uint32_t pc;
 114
 115         /* Pseudo register for the kernel stack.  */
 116         uint32_t ksp;
 117
 118         /* Branch.  */
 119         int dslot;
 120         int btaken;
 121         uint32_t btarget;
 122
 123         /* Condition flag tracking.  */
 124         uint32_t cc_op;
 125         uint32_t cc_mask;
 126         uint32_t cc_dest;
 127         uint32_t cc_src;
 128         uint32_t cc_result;
 129         /* size of the operation, 1 = byte, 2 = word, 4 = dword.  */
 130         int cc_size;
 131         /* X flag at the time of cc snapshot.  */
 132         int cc_x;
 133
 134         /* CRIS has certain insns that lockout interrupts.  */
 135         int locked_irq;
 136         int interrupt_vector;
 137         int fault_vector;
 138         int trap_vector;
 139
 140         /* FIXME: add a check in the translator to avoid writing to support
 141            register sets beyond the 4th. The ISA allows up to 256! but in
 142            practice there is no core that implements more than 4.
 143
 144            Support function registers are used to control units close to the
 145            core. Accesses do not pass down the normal hierarchy.
 146         */
 147         uint32_t sregs[4][16];
 148
 149         /* Linear feedback shift reg in the mmu. Used to provide pseudo
 150            randomness for the 'hint' the mmu gives to sw for chosing valid
 151            sets on TLB refills.  */
 152         uint32_t mmu_rand_lfsr;
 153
 154         /*
 155          * We just store the stores to the tlbset here for later evaluation
 156          * when the hw needs access to them.
 157          *
 158          * One for I and another for D.
 159          */
 160         struct
 161         {
 162                 uint32_t hi;
 163                 uint32_t lo;
 164         } tlbsets[2][4][16];
 165
 166         CPU_COMMON
 167
 168         /* Members after CPU_COMMON are preserved across resets.  */
 169         void *load_info;
 170 } CPUCRISState;
 171
 172 CPUCRISState *cpu_cris_init(const char *cpu_model);
 173 int cpu_cris_exec(CPUCRISState *s);
 174 void cpu_cris_close(CPUCRISState *s);
 175 void do_interrupt(CPUCRISState *env);
 176 /* you can call this signal handler from your SIGBUS and SIGSEGV
 177    signal handlers to inform the virtual CPU of exceptions. non zero
 178    is returned if the signal was handled by the virtual CPU.  */
 179 int cpu_cris_signal_handler(int host_signum, void *pinfo,
 180                            void *puc);
 181
 182 enum {
 183     CC_OP_DYNAMIC, /* Use env->cc_op  */
 184     CC_OP_FLAGS,
 185     CC_OP_CMP,
 186     CC_OP_MOVE,
 187     CC_OP_ADD,
 188     CC_OP_ADDC,
 189     CC_OP_MCP,
 190     CC_OP_ADDU,
 191     CC_OP_SUB,
 192     CC_OP_SUBU,
 193     CC_OP_NEG,
 194     CC_OP_BTST,
 195     CC_OP_MULS,
 196     CC_OP_MULU,
 197     CC_OP_DSTEP,
 198     CC_OP_MSTEP,
 199     CC_OP_BOUND,
 200
 201     CC_OP_OR,
 202     CC_OP_AND,
 203     CC_OP_XOR,
 204     CC_OP_LSL,
 205     CC_OP_LSR,
 206     CC_OP_ASR,
 207     CC_OP_LZ
 208 };
 209
 210 /* CRIS uses 8k pages.  */
 211 #define TARGET_PAGE_BITS 13
 212 #define MMAP_SHIFT TARGET_PAGE_BITS
 213
 214 #define TARGET_PHYS_ADDR_SPACE_BITS 32
 215 #define TARGET_VIRT_ADDR_SPACE_BITS 32
 216
 217 #define cpu_init cpu_cris_init
 218 #define cpu_exec cpu_cris_exec
 219 #define cpu_gen_code cpu_cris_gen_code
 220 #define cpu_signal_handler cpu_cris_signal_handler
 221
 222 #define CPU_SAVE_VERSION 1
 223
 224 /* MMU modes definitions */
 225 #define MMU_MODE0_SUFFIX _kernel
 226 #define MMU_MODE1_SUFFIX _user
 227 #define MMU_USER_IDX 1
 228 static inline int cpu_mmu_index (CPUCRISState *env)
 229 {
 230         return !!(env->pregs[PR_CCS] & U_FLAG);
 231 }
 232
 233 int cpu_cris_handle_mmu_fault(CPUCRISState *env, target_ulong address, int rw,
 234                               int mmu_idx);
 235 #define cpu_handle_mmu_fault cpu_cris_handle_mmu_fault
 236
 237 #if defined(CONFIG_USER_ONLY)
 238 static inline void cpu_clone_regs(CPUCRISState *env, target_ulong newsp)
 239 {
 240     if (newsp)
 241         env->regs[14] = newsp;
 242     env->regs[10] = 0;
 243 }
 244 #endif
 245
 246 static inline void cpu_set_tls(CPUCRISState *env, target_ulong newtls)
 247 {
 248         env->pregs[PR_PID] = (env->pregs[PR_PID] & 0xff) | newtls;
 249 }
 250
 251 /* Support function regs.  */
 252 #define SFR_RW_GC_CFG      0][0
 253 #define SFR_RW_MM_CFG      env->pregs[PR_SRS]][0
 254 #define SFR_RW_MM_KBASE_LO env->pregs[PR_SRS]][1
 255 #define SFR_RW_MM_KBASE_HI env->pregs[PR_SRS]][2
 256 #define SFR_R_MM_CAUSE     env->pregs[PR_SRS]][3
 257 #define SFR_RW_MM_TLB_SEL  env->pregs[PR_SRS]][4
 258 #define SFR_RW_MM_TLB_LO   env->pregs[PR_SRS]][5
 259 #define SFR_RW_MM_TLB_HI   env->pregs[PR_SRS]][6
 260
 261 #include "cpu-all.h"
 262
 263 static inline void cpu_get_tb_cpu_state(CPUCRISState *env, target_ulong *pc,
 264                                         target_ulong *cs_base, int *flags)
 265 {
 266     *pc = env->pc;
 267     *cs_base = 0;
 268     *flags = env->dslot |
 269             (env->pregs[PR_CCS] & (S_FLAG | P_FLAG | U_FLAG
 270                                      | X_FLAG | PFIX_FLAG));
 271 }
 272
 273 #define cpu_list cris_cpu_list
 274 void cris_cpu_list(FILE *f, fprintf_function cpu_fprintf);
 275
 276 static inline bool cpu_has_work(CPUCRISState *env)
 277 {
 278     return env->interrupt_request & (CPU_INTERRUPT_HARD | CPU_INTERRUPT_NMI);
 279 }
 280
 281 #include "exec-all.h"
 282
 283 static inline void cpu_pc_from_tb(CPUCRISState *env, TranslationBlock *tb)
 284 {
 285     env->pc = tb->pc;
 286 }
 287 #endif