sim/pru/sim-main.h

   1 /* Copyright 2016-2019 Free Software Foundation, Inc.
   2    Contributed by Dimitar Dimitrov <dimitar@dinux.eu>
   3
   4    This file is part of the PRU simulator.
   5
   6    This library is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program 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
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef PRU_SIM_MAIN
  20 #define PRU_SIM_MAIN
  21
  22 #include <stdint.h>
  23 #include <stddef.h>
  24 #include "pru.h"
  25 #include "sim-basics.h"
  26
  27 #include "sim-base.h"
  28
  29 /* The machine state.
  30    This state is maintained in host byte order.  The
  31    fetch/store register functions must translate between host
  32    byte order and the target processor byte order.
  33    Keeping this data in target byte order simplifies the register
  34    read/write functions.  Keeping this data in host order improves
  35    the performance of the simulator.  Simulation speed is deemed more
  36    important.  */
  37
  38 /* For clarity, please keep the same relative order in this enum as in the
  39    corresponding group of GP registers.
  40
  41    In PRU ISA, Multiplier-Accumulator-Unit's registers are like "shadows" of
  42    the GP registers.  MAC registers are implicitly addressed when executing
  43    the XIN/XOUT instructions to access them.  Transfer to/from a MAC register
  44    can happen only from/to its corresponding GP peer register.  */
  45
  46 enum pru_macreg_id {
  47     /* MAC register       CPU GP register     Description.  */
  48     PRU_MACREG_MODE,      /* r25 */           /* Mode (MUL/MAC).  */
  49     PRU_MACREG_PROD_L,    /* r26 */           /* Lower 32 bits of product.  */
  50     PRU_MACREG_PROD_H,    /* r27 */           /* Higher 32 bits of product.  */
  51     PRU_MACREG_OP_0,      /* r28 */           /* First operand.  */
  52     PRU_MACREG_OP_1,      /* r29 */           /* Second operand.  */
  53     PRU_MACREG_ACC_L,     /* N/A */           /* Accumulator (not exposed)  */
  54     PRU_MACREG_ACC_H,     /* N/A */           /* Higher 32 bits of MAC
  55                                                  accumulator.  */
  56     PRU_MAC_NREGS
  57 };
  58
  59 struct pru_regset
  60 {
  61   uint32_t        regs[32];             /* Primary registers.  */
  62   uint16_t        pc;                   /* IMEM _word_ address.  */
  63   uint32_t        pc_addr_space_marker; /* IMEM virtual linker offset.  This
  64                                            is the artificial offset that
  65                                            we invent in order to "separate"
  66                                            the DMEM and IMEM memory spaces.  */
  67   unsigned int    carry : 1;
  68   uint32_t        ctable[32];           /* Constant offsets table for xBCO.  */
  69   uint32_t        macregs[PRU_MAC_NREGS];
  70   uint32_t        scratchpads[XFRID_MAX + 1][32];
  71   struct {
  72     uint16_t looptop;                   /* LOOP top (PC of loop instr).  */
  73     uint16_t loopend;                   /* LOOP end (PC of loop end label).  */
  74     int loop_in_progress;               /* Whether to check for PC==loopend.  */
  75     uint32_t loop_counter;              /* LOOP counter.  */
  76   } loop;
  77   int             cycles;
  78   int             insts;
  79 };
  80
  81 struct _sim_cpu {
  82   struct pru_regset pru_cpu;
  83   sim_cpu_base base;
  84 };
  85
  86 struct sim_state {
  87   sim_cpu *cpu[MAX_NR_PROCESSORS];
  88
  89   sim_state_base base;
  90 };
  91 #endif /* PRU_SIM_MAIN */