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 #ifndef CPU_NIOS2_H
  21 #define CPU_NIOS2_H
  22
  23 #include "qemu-common.h"
  24
  25 #define TARGET_LONG_BITS 32
  26
  27 #define CPUArchState struct CPUNios2State
  28
  29 #include "exec/cpu-defs.h"
  30 #include "qom/cpu.h"
  31 struct CPUNios2State;
  32 typedef struct CPUNios2State CPUNios2State;
  33 #if !defined(CONFIG_USER_ONLY)
  34 #include "mmu.h"
  35 #endif
  36
  37 #define TYPE_NIOS2_CPU "nios2-cpu"
  38
  39 #define NIOS2_CPU_CLASS(klass) \
  40     OBJECT_CLASS_CHECK(Nios2CPUClass, (klass), TYPE_NIOS2_CPU)
  41 #define NIOS2_CPU(obj) \
  42     OBJECT_CHECK(Nios2CPU, (obj), TYPE_NIOS2_CPU)
  43 #define NIOS2_CPU_GET_CLASS(obj) \
  44     OBJECT_GET_CLASS(Nios2CPUClass, (obj), TYPE_NIOS2_CPU)
  45
  46 /**
  47  * Nios2CPUClass:
  48  * @parent_reset: The parent class' reset handler.
  49  *
  50  * A Nios2 CPU model.
  51  */
  52 typedef struct Nios2CPUClass {
  53     /*< private >*/
  54     CPUClass parent_class;
  55     /*< public >*/
  56
  57     DeviceRealize parent_realize;
  58     void (*parent_reset)(CPUState *cpu);
  59 } Nios2CPUClass;
  60
  61 #define TARGET_HAS_ICE 1
  62
  63 /* Configuration options for Nios II */
  64 #define RESET_ADDRESS         0x00000000
  65 #define EXCEPTION_ADDRESS     0x00000004
  66 #define FAST_TLB_MISS_ADDRESS 0x00000008
  67
  68
  69 /* GP regs + CR regs + PC */
  70 #define NUM_CORE_REGS (32 + 32 + 1)
  71
  72 /* General purpose register aliases */
  73 #define R_ZERO   0
  74 #define R_AT     1
  75 #define R_RET0   2
  76 #define R_RET1   3
  77 #define R_ARG0   4
  78 #define R_ARG1   5
  79 #define R_ARG2   6
  80 #define R_ARG3   7
  81 #define R_ET     24
  82 #define R_BT     25
  83 #define R_GP     26
  84 #define R_SP     27
  85 #define R_FP     28
  86 #define R_EA     29
  87 #define R_BA     30
  88 #define R_RA     31
  89
  90 /* Control register aliases */
  91 #define CR_BASE  32
  92 #define CR_STATUS    (CR_BASE + 0)
  93 #define   CR_STATUS_PIE  (1 << 0)
  94 #define   CR_STATUS_U    (1 << 1)
  95 #define   CR_STATUS_EH   (1 << 2)
  96 #define   CR_STATUS_IH   (1 << 3)
  97 #define   CR_STATUS_IL   (63 << 4)
  98 #define   CR_STATUS_CRS  (63 << 10)
  99 #define   CR_STATUS_PRS  (63 << 16)
 100 #define   CR_STATUS_NMI  (1 << 22)
 101 #define   CR_STATUS_RSIE (1 << 23)
 102 #define CR_ESTATUS   (CR_BASE + 1)
 103 #define CR_BSTATUS   (CR_BASE + 2)
 104 #define CR_IENABLE   (CR_BASE + 3)
 105 #define CR_IPENDING  (CR_BASE + 4)
 106 #define CR_CPUID     (CR_BASE + 5)
 107 #define CR_CTL6      (CR_BASE + 6)
 108 #define CR_EXCEPTION (CR_BASE + 7)
 109 #define CR_PTEADDR   (CR_BASE + 8)
 110 #define   CR_PTEADDR_PTBASE_SHIFT 22
 111 #define   CR_PTEADDR_PTBASE_MASK  (0x3FF << CR_PTEADDR_PTBASE_SHIFT)
 112 #define   CR_PTEADDR_VPN_SHIFT    2
 113 #define   CR_PTEADDR_VPN_MASK     (0xFFFFF << CR_PTEADDR_VPN_SHIFT)
 114 #define CR_TLBACC    (CR_BASE + 9)
 115 #define   CR_TLBACC_IGN_SHIFT 25
 116 #define   CR_TLBACC_IGN_MASK  (0x7F << CR_TLBACC_IGN_SHIFT)
 117 #define   CR_TLBACC_C         (1 << 24)
 118 #define   CR_TLBACC_R         (1 << 23)
 119 #define   CR_TLBACC_W         (1 << 22)
 120 #define   CR_TLBACC_X         (1 << 21)
 121 #define   CR_TLBACC_G         (1 << 20)
 122 #define   CR_TLBACC_PFN_MASK  0x000FFFFF
 123 #define CR_TLBMISC   (CR_BASE + 10)
 124 #define   CR_TLBMISC_WAY_SHIFT 20
 125 #define   CR_TLBMISC_WAY_MASK  (0xF << CR_TLBMISC_WAY_SHIFT)
 126 #define   CR_TLBMISC_RD        (1 << 19)
 127 #define   CR_TLBMISC_WR        (1 << 18)
 128 #define   CR_TLBMISC_PID_SHIFT 4
 129 #define   CR_TLBMISC_PID_MASK  (0x3FFF << CR_TLBMISC_PID_SHIFT)
 130 #define   CR_TLBMISC_DBL       (1 << 3)
 131 #define   CR_TLBMISC_BAD       (1 << 2)
 132 #define   CR_TLBMISC_PERM      (1 << 1)
 133 #define   CR_TLBMISC_D         (1 << 0)
 134 #define CR_ENCINJ    (CR_BASE + 11)
 135 #define CR_BADADDR   (CR_BASE + 12)
 136 #define CR_CONFIG    (CR_BASE + 13)
 137 #define CR_MPUBASE   (CR_BASE + 14)
 138 #define CR_MPUACC    (CR_BASE + 15)
 139
 140 /* Other registers */
 141 #define R_PC         64
 142
 143 /* Exceptions */
 144 #define EXCP_BREAK    -1
 145 #define EXCP_RESET    0
 146 #define EXCP_PRESET   1
 147 #define EXCP_IRQ      2
 148 #define EXCP_TRAP     3
 149 #define EXCP_UNIMPL   4
 150 #define EXCP_ILLEGAL  5
 151 #define EXCP_UNALIGN  6
 152 #define EXCP_UNALIGND 7
 153 #define EXCP_DIV      8
 154 #define EXCP_SUPERA   9
 155 #define EXCP_SUPERI   10
 156 #define EXCP_SUPERD   11
 157 #define EXCP_TLBD     12
 158 #define EXCP_TLBX     13
 159 #define EXCP_TLBR     14
 160 #define EXCP_TLBW     15
 161 #define EXCP_MPUI     16
 162 #define EXCP_MPUD     17
 163
 164 #define CPU_INTERRUPT_NMI       CPU_INTERRUPT_TGT_EXT_3
 165
 166 #define NB_MMU_MODES 2
 167
 168 struct CPUNios2State {
 169     uint32_t regs[NUM_CORE_REGS];
 170
 171 #if !defined(CONFIG_USER_ONLY)
 172     Nios2MMU mmu;
 173
 174     uint32_t irq_pending;
 175 #endif
 176
 177     CPU_COMMON
 178 };
 179
 180 /**
 181  * Nios2CPU:
 182  * @env: #CPUNios2State
 183  *
 184  * A Nios2 CPU.
 185  */
 186 typedef struct Nios2CPU {
 187     /*< private >*/
 188     CPUState parent_obj;
 189     /*< public >*/
 190
 191     CPUNios2State env;
 192     bool mmu_present;
 193     uint32_t pid_num_bits;
 194     uint32_t tlb_num_ways;
 195     uint32_t tlb_num_entries;
 196
 197     /* Addresses that are hard-coded in the FPGA build settings */
 198     uint32_t reset_addr;
 199     uint32_t exception_addr;
 200     uint32_t fast_tlb_miss_addr;
 201 } Nios2CPU;
 202
 203 static inline Nios2CPU *nios2_env_get_cpu(CPUNios2State *env)
 204 {
 205     return NIOS2_CPU(container_of(env, Nios2CPU, env));
 206 }
 207
 208 #define ENV_GET_CPU(e) CPU(nios2_env_get_cpu(e))
 209
 210 #define ENV_OFFSET offsetof(Nios2CPU, env)
 211
 212 void nios2_tcg_init(void);
 213 void nios2_cpu_do_interrupt(CPUState *cs);
 214 int cpu_nios2_signal_handler(int host_signum, void *pinfo, void *puc);
 215 void dump_mmu(FILE *f, fprintf_function cpu_fprintf, CPUNios2State *env);
 216 void nios2_cpu_dump_state(CPUState *cpu, FILE *f, fprintf_function cpu_fprintf,
 217                           int flags);
 218 hwaddr nios2_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
 219 void nios2_cpu_do_unaligned_access(CPUState *cpu, vaddr addr,
 220                                    MMUAccessType access_type,
 221                                    int mmu_idx, uintptr_t retaddr);
 222
 223 qemu_irq *nios2_cpu_pic_init(Nios2CPU *cpu);
 224 void nios2_check_interrupts(CPUNios2State *env);
 225
 226 #define TARGET_PHYS_ADDR_SPACE_BITS 32
 227 #ifdef CONFIG_USER_ONLY
 228 # define TARGET_VIRT_ADDR_SPACE_BITS 31
 229 #else
 230 # define TARGET_VIRT_ADDR_SPACE_BITS 32
 231 #endif
 232
 233 #define CPU_RESOLVING_TYPE TYPE_NIOS2_CPU
 234
 235 #define cpu_gen_code cpu_nios2_gen_code
 236 #define cpu_signal_handler cpu_nios2_signal_handler
 237
 238 #define CPU_SAVE_VERSION 1
 239
 240 #define TARGET_PAGE_BITS 12
 241
 242 /* MMU modes definitions */
 243 #define MMU_MODE0_SUFFIX _kernel
 244 #define MMU_MODE1_SUFFIX _user
 245 #define MMU_SUPERVISOR_IDX  0
 246 #define MMU_USER_IDX        1
 247
 248 static inline int cpu_mmu_index(CPUNios2State *env, bool ifetch)
 249 {
 250     return (env->regs[CR_STATUS] & CR_STATUS_U) ? MMU_USER_IDX :
 251                                                   MMU_SUPERVISOR_IDX;
 252 }
 253
 254 int nios2_cpu_handle_mmu_fault(CPUState *env, vaddr address, int size,
 255                                int rw, int mmu_idx);
 256
 257 static inline int cpu_interrupts_enabled(CPUNios2State *env)
 258 {
 259     return env->regs[CR_STATUS] & CR_STATUS_PIE;
 260 }
 261
 262 #include "exec/cpu-all.h"
 263
 264 static inline void cpu_get_tb_cpu_state(CPUNios2State *env, target_ulong *pc,
 265                                         target_ulong *cs_base, uint32_t *flags)
 266 {
 267     *pc = env->regs[R_PC];
 268     *cs_base = 0;
 269     *flags = (env->regs[CR_STATUS] & (CR_STATUS_EH | CR_STATUS_U));
 270 }
 271
 272 #endif /* CPU_NIOS2_H */