target/nios2/cpu.h

   1 /*
   2  * Altera Nios II virtual CPU header
   3  *
   4  * Copyright (c) 2012 Chris Wulff <crwulff@gmail.com>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library 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 GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see
  18  * <http://www.gnu.org/licenses/lgpl-2.1.html>
  19  */
  20
  21 #ifndef NIOS2_CPU_H
  22 #define NIOS2_CPU_H
  23
  24 #include "exec/cpu-defs.h"
  25 #include "hw/core/cpu.h"
  26
  27 typedef struct CPUNios2State CPUNios2State;
  28 #if !defined(CONFIG_USER_ONLY)
  29 #include "mmu.h"
  30 #endif
  31
  32 #define TYPE_NIOS2_CPU "nios2-cpu"
  33
  34 #define NIOS2_CPU_CLASS(klass) \
  35     OBJECT_CLASS_CHECK(Nios2CPUClass, (klass), TYPE_NIOS2_CPU)
  36 #define NIOS2_CPU(obj) \
  37     OBJECT_CHECK(Nios2CPU, (obj), TYPE_NIOS2_CPU)
  38 #define NIOS2_CPU_GET_CLASS(obj) \
  39     OBJECT_GET_CLASS(Nios2CPUClass, (obj), TYPE_NIOS2_CPU)
  40
  41 /**
  42  * Nios2CPUClass:
  43  * @parent_reset: The parent class' reset handler.
  44  *
  45  * A Nios2 CPU model.
  46  */
  47 typedef struct Nios2CPUClass {
  48     /*< private >*/
  49     CPUClass parent_class;
  50     /*< public >*/
  51
  52     DeviceRealize parent_realize;
  53     DeviceReset parent_reset;
  54 } Nios2CPUClass;
  55
  56 #define TARGET_HAS_ICE 1
  57
  58 /* Configuration options for Nios II */
  59 #define RESET_ADDRESS         0x00000000
  60 #define EXCEPTION_ADDRESS     0x00000004
  61 #define FAST_TLB_MISS_ADDRESS 0x00000008
  62
  63
  64 /* GP regs + CR regs + PC */
  65 #define NUM_CORE_REGS (32 + 32 + 1)
  66
  67 /* General purpose register aliases */
  68 #define R_ZERO   0
  69 #define R_AT     1
  70 #define R_RET0   2
  71 #define R_RET1   3
  72 #define R_ARG0   4
  73 #define R_ARG1   5
  74 #define R_ARG2   6
  75 #define R_ARG3   7
  76 #define R_ET     24
  77 #define R_BT     25
  78 #define R_GP     26
  79 #define R_SP     27
  80 #define R_FP     28
  81 #define R_EA     29
  82 #define R_BA     30
  83 #define R_RA     31
  84
  85 /* Control register aliases */
  86 #define CR_BASE  32
  87 #define CR_STATUS    (CR_BASE + 0)
  88 #define   CR_STATUS_PIE  (1 << 0)
  89 #define   CR_STATUS_U    (1 << 1)
  90 #define   CR_STATUS_EH   (1 << 2)
  91 #define   CR_STATUS_IH   (1 << 3)
  92 #define   CR_STATUS_IL   (63 << 4)
  93 #define   CR_STATUS_CRS  (63 << 10)
  94 #define   CR_STATUS_PRS  (63 << 16)
  95 #define   CR_STATUS_NMI  (1 << 22)
  96 #define   CR_STATUS_RSIE (1 << 23)
  97 #define CR_ESTATUS   (CR_BASE + 1)
  98 #define CR_BSTATUS   (CR_BASE + 2)
  99 #define CR_IENABLE   (CR_BASE + 3)
 100 #define CR_IPENDING  (CR_BASE + 4)
 101 #define CR_CPUID     (CR_BASE + 5)
 102 #define CR_CTL6      (CR_BASE + 6)
 103 #define CR_EXCEPTION (CR_BASE + 7)
 104 #define CR_PTEADDR   (CR_BASE + 8)
 105 #define   CR_PTEADDR_PTBASE_SHIFT 22
 106 #define   CR_PTEADDR_PTBASE_MASK  (0x3FF << CR_PTEADDR_PTBASE_SHIFT)
 107 #define   CR_PTEADDR_VPN_SHIFT    2
 108 #define   CR_PTEADDR_VPN_MASK     (0xFFFFF << CR_PTEADDR_VPN_SHIFT)
 109 #define CR_TLBACC    (CR_BASE + 9)
 110 #define   CR_TLBACC_IGN_SHIFT 25
 111 #define   CR_TLBACC_IGN_MASK  (0x7F << CR_TLBACC_IGN_SHIFT)
 112 #define   CR_TLBACC_C         (1 << 24)
 113 #define   CR_TLBACC_R         (1 << 23)
 114 #define   CR_TLBACC_W         (1 << 22)
 115 #define   CR_TLBACC_X         (1 << 21)
 116 #define   CR_TLBACC_G         (1 << 20)
 117 #define   CR_TLBACC_PFN_MASK  0x000FFFFF
 118 #define CR_TLBMISC   (CR_BASE + 10)
 119 #define   CR_TLBMISC_WAY_SHIFT 20
 120 #define   CR_TLBMISC_WAY_MASK  (0xF << CR_TLBMISC_WAY_SHIFT)
 121 #define   CR_TLBMISC_RD        (1 << 19)
 122 #define   CR_TLBMISC_WR        (1 << 18)
 123 #define   CR_TLBMISC_PID_SHIFT 4
 124 #define   CR_TLBMISC_PID_MASK  (0x3FFF << CR_TLBMISC_PID_SHIFT)
 125 #define   CR_TLBMISC_DBL       (1 << 3)
 126 #define   CR_TLBMISC_BAD       (1 << 2)
 127 #define   CR_TLBMISC_PERM      (1 << 1)
 128 #define   CR_TLBMISC_D         (1 << 0)
 129 #define CR_ENCINJ    (CR_BASE + 11)
 130 #define CR_BADADDR   (CR_BASE + 12)
 131 #define CR_CONFIG    (CR_BASE + 13)
 132 #define CR_MPUBASE   (CR_BASE + 14)
 133 #define CR_MPUACC    (CR_BASE + 15)
 134
 135 /* Other registers */
 136 #define R_PC         64
 137
 138 /* Exceptions */
 139 #define EXCP_BREAK    0x1000
 140 #define EXCP_RESET    0
 141 #define EXCP_PRESET   1
 142 #define EXCP_IRQ      2
 143 #define EXCP_TRAP     3
 144 #define EXCP_UNIMPL   4
 145 #define EXCP_ILLEGAL  5
 146 #define EXCP_UNALIGN  6
 147 #define EXCP_UNALIGND 7
 148 #define EXCP_DIV      8
 149 #define EXCP_SUPERA   9
 150 #define EXCP_SUPERI   10
 151 #define EXCP_SUPERD   11
 152 #define EXCP_TLBD     12
 153 #define EXCP_TLBX     13
 154 #define EXCP_TLBR     14
 155 #define EXCP_TLBW     15
 156 #define EXCP_MPUI     16
 157 #define EXCP_MPUD     17
 158
 159 #define CPU_INTERRUPT_NMI       CPU_INTERRUPT_TGT_EXT_3
 160
 161 struct CPUNios2State {
 162     uint32_t regs[NUM_CORE_REGS];
 163
 164 #if !defined(CONFIG_USER_ONLY)
 165     Nios2MMU mmu;
 166
 167     uint32_t irq_pending;
 168 #endif
 169 };
 170
 171 /**
 172  * Nios2CPU:
 173  * @env: #CPUNios2State
 174  *
 175  * A Nios2 CPU.
 176  */
 177 typedef struct Nios2CPU {
 178     /*< private >*/
 179     CPUState parent_obj;
 180     /*< public >*/
 181
 182     CPUNegativeOffsetState neg;
 183     CPUNios2State env;
 184
 185     bool mmu_present;
 186     uint32_t pid_num_bits;
 187     uint32_t tlb_num_ways;
 188     uint32_t tlb_num_entries;
 189
 190     /* Addresses that are hard-coded in the FPGA build settings */
 191     uint32_t reset_addr;
 192     uint32_t exception_addr;
 193     uint32_t fast_tlb_miss_addr;
 194 } Nios2CPU;
 195
 196
 197 void nios2_tcg_init(void);
 198 void nios2_cpu_do_interrupt(CPUState *cs);
 199 int cpu_nios2_signal_handler(int host_signum, void *pinfo, void *puc);
 200 void dump_mmu(CPUNios2State *env);
 201 void nios2_cpu_dump_state(CPUState *cpu, FILE *f, int flags);
 202 hwaddr nios2_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
 203 void nios2_cpu_do_unaligned_access(CPUState *cpu, vaddr addr,
 204                                    MMUAccessType access_type,
 205                                    int mmu_idx, uintptr_t retaddr);
 206
 207 qemu_irq *nios2_cpu_pic_init(Nios2CPU *cpu);
 208 void nios2_check_interrupts(CPUNios2State *env);
 209
 210 void do_nios2_semihosting(CPUNios2State *env);
 211
 212 #define CPU_RESOLVING_TYPE TYPE_NIOS2_CPU
 213
 214 #define cpu_gen_code cpu_nios2_gen_code
 215 #define cpu_signal_handler cpu_nios2_signal_handler
 216
 217 #define CPU_SAVE_VERSION 1
 218
 219 /* MMU modes definitions */
 220 #define MMU_SUPERVISOR_IDX  0
 221 #define MMU_USER_IDX        1
 222
 223 static inline int cpu_mmu_index(CPUNios2State *env, bool ifetch)
 224 {
 225     return (env->regs[CR_STATUS] & CR_STATUS_U) ? MMU_USER_IDX :
 226                                                   MMU_SUPERVISOR_IDX;
 227 }
 228
 229 bool nios2_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
 230                         MMUAccessType access_type, int mmu_idx,
 231                         bool probe, uintptr_t retaddr);
 232
 233 static inline int cpu_interrupts_enabled(CPUNios2State *env)
 234 {
 235     return env->regs[CR_STATUS] & CR_STATUS_PIE;
 236 }
 237
 238 typedef CPUNios2State CPUArchState;
 239 typedef Nios2CPU ArchCPU;
 240
 241 #include "exec/cpu-all.h"
 242
 243 static inline void cpu_get_tb_cpu_state(CPUNios2State *env, target_ulong *pc,
 244                                         target_ulong *cs_base, uint32_t *flags)
 245 {
 246     *pc = env->regs[R_PC];
 247     *cs_base = 0;
 248     *flags = (env->regs[CR_STATUS] & (CR_STATUS_EH | CR_STATUS_U));
 249 }
 250
 251 #endif /* NIOS2_CPU_H */