1 // See LICENSE for license details.
2 #ifndef _RISCV_PROCESSOR_H
3 #define _RISCV_PROCESSOR_H
13 typedef reg_t (*insn_func_t
)(processor_t
*, insn_t
, reg_t
);
27 struct commit_log_reg_t
33 // architectural state of a RISC-V hart
39 regfile_t
<reg_t
, NXPR
, true> XPR
;
40 regfile_t
<freg_t
, NFPR
, false> FPR
;
42 // control and status registers
59 reg_t suinstret_delta
;
64 bool serialized
; // whether timer CSRs are in a well-defined state
66 reg_t load_reservation
;
68 #ifdef RISCV_ENABLE_COMMITLOG
69 commit_log_reg_t log_reg_write
;
74 // this class represents one processor in a RISC-V machine.
78 processor_t(const char* isa
, sim_t
* sim
, uint32_t id
);
81 void set_debug(bool value
);
82 void set_histogram(bool value
);
83 void reset(bool value
);
84 void step(size_t n
); // run for n cycles
85 void deliver_ipi(); // register an interprocessor interrupt
86 bool running() { return run
; }
87 void set_csr(int which
, reg_t val
);
88 void raise_interrupt(reg_t which
);
89 reg_t
get_csr(int which
);
90 mmu_t
* get_mmu() { return mmu
; }
91 state_t
* get_state() { return &state
; }
92 extension_t
* get_extension() { return ext
; }
93 bool supports_extension(unsigned char ext
) {
94 return ext
>= 'A' && ext
<= 'Z' && ((cpuid
>> (ext
- 'A')) & 1);
96 void push_privilege_stack();
97 void pop_privilege_stack();
98 void yield_load_reservation() { state
.load_reservation
= (reg_t
)-1; }
99 void update_histogram(size_t pc
);
101 void register_insn(insn_desc_t
);
102 void register_extension(extension_t
*);
106 mmu_t
* mmu
; // main memory is always accessed via the mmu
108 disassembler_t
* disassembler
;
116 bool histogram_enabled
;
118 std::vector
<insn_desc_t
> instructions
;
119 std::map
<size_t,size_t> pc_histogram
;
121 static const size_t OPCODE_CACHE_SIZE
= 8191;
122 insn_desc_t opcode_cache
[OPCODE_CACHE_SIZE
];
125 void take_interrupt(); // take a trap if any interrupts are pending
126 void take_trap(trap_t
& t
, reg_t epc
); // take an exception
127 void disasm(insn_t insn
); // disassemble and print an instruction
131 friend class extension_t
;
133 void parse_isa_string(const char* isa
);
134 void build_opcode_map();
135 void register_base_instructions();
136 insn_func_t
decode_insn(insn_t insn
);
139 reg_t
illegal_instruction(processor_t
* p
, insn_t insn
, reg_t pc
);
141 #define REGISTER_INSN(proc, name, match, mask) \
142 extern reg_t rv32_##name(processor_t*, insn_t, reg_t); \
143 extern reg_t rv64_##name(processor_t*, insn_t, reg_t); \
144 proc->register_insn((insn_desc_t){match, mask, rv32_##name, rv64_##name});