+// See LICENSE for license details.
#ifndef _RISCV_PROCESSOR_H
#define _RISCV_PROCESSOR_H
#include "decode.h"
+#include "config.h"
#include <cstring>
-#include "trap.h"
-#include "mmu.h"
-
-#define MAX_UTS 32
+#include <memory>
+#include <vector>
+class processor_t;
+class mmu_t;
+typedef reg_t (*insn_func_t)(processor_t*, insn_t, reg_t);
class sim_t;
+class trap_t;
+class extension_t;
+class disassembler_t;
-class processor_t
+struct insn_desc_t
{
-public:
- processor_t(sim_t* _sim, char* _mem, size_t _memsz);
- void init(uint32_t _id, char* _mem, size_t _memsz);
- void step(size_t n, bool noisy);
-
-private:
- sim_t* sim;
+ uint32_t match;
+ uint32_t mask;
+ insn_func_t rv32;
+ insn_func_t rv64;
+};
- // architected state
- reg_t XPR[NXPR];
- freg_t FPR[NFPR];
+// architectural state of a RISC-V hart
+struct state_t
+{
+ void reset();
- // privileged control registers
reg_t pc;
+ regfile_t<reg_t, NXPR, true> XPR;
+ regfile_t<freg_t, NFPR, false> FPR;
+
+ // control and status registers
reg_t epc;
reg_t badvaddr;
- reg_t cause;
reg_t evec;
- reg_t tohost;
- reg_t fromhost;
+ reg_t ptbr;
reg_t pcr_k0;
reg_t pcr_k1;
- uint32_t id;
- uint32_t sr;
- uint32_t count;
+ reg_t cause;
+ reg_t tohost;
+ reg_t fromhost;
+ reg_t count;
uint32_t compare;
+ uint32_t sr; // only modify the status register using set_pcr()
+ uint32_t fflags;
+ uint32_t frm;
- // unprivileged control registers
- uint32_t fsr;
-
- // # of bits in an XPR (32 or 64). (redundant with sr)
- int xprlen;
-
- // shared memory
- mmu_t mmu;
+ reg_t load_reservation;
+};
- // counters
- reg_t counters[32];
+// this class represents one processor in a RISC-V machine.
+class processor_t
+{
+public:
+ processor_t(sim_t* _sim, mmu_t* _mmu, uint32_t _id);
+ ~processor_t();
+
+ void set_debug(bool value);
+ void reset(bool value);
+ void step(size_t n); // run for n cycles
+ void deliver_ipi(); // register an interprocessor interrupt
+ bool running() { return run; }
+ reg_t set_pcr(int which, reg_t val);
+ void set_fromhost(reg_t val);
+ void set_interrupt(int which, bool on);
+ reg_t get_pcr(int which);
+ mmu_t* get_mmu() { return mmu; }
+ state_t* get_state() { return &state; }
+ extension_t* get_extension() { return ext; }
+ void yield_load_reservation() { state.load_reservation = (reg_t)-1; }
+
+ void register_insn(insn_desc_t);
+ void register_extension(extension_t*);
- // functions
- void set_sr(uint32_t val);
- void set_fsr(uint32_t val);
- void take_trap(trap_t t, bool noisy);
- void disasm(insn_t insn, reg_t pc);
+private:
+ sim_t* sim;
+ mmu_t* mmu; // main memory is always accessed via the mmu
+ extension_t* ext;
+ std::unique_ptr<disassembler_t> disassembler;
+ state_t state;
+ uint32_t id;
+ bool run; // !reset
+ bool debug;
+ bool rv64;
- // vector stuff
- void vcfg();
- void setvl(int vlapp);
+ std::vector<insn_desc_t> instructions;
+ std::vector<insn_desc_t*> opcode_map;
+ std::vector<insn_desc_t> opcode_store;
- bool utmode;
- int utidx;
- int vlmax;
- int vl;
- int nxpr_all;
- int nfpr_all;
- int nxpr_use;
- int nfpr_use;
- processor_t* uts[MAX_UTS];
+ void take_interrupt(); // take a trap if any interrupts are pending
+ void take_trap(trap_t& t); // take an exception
+ void disasm(insn_t insn); // disassemble and print an instruction
friend class sim_t;
+ friend class mmu_t;
+ friend class extension_t;
+
+ void build_opcode_map();
+ insn_func_t decode_insn(insn_t insn);
};
+reg_t illegal_instruction(processor_t* p, insn_t insn, reg_t pc);
+
+#define REGISTER_INSN(proc, name, match, mask) \
+ extern reg_t rv32_##name(processor_t*, insn_t, reg_t); \
+ extern reg_t rv64_##name(processor_t*, insn_t, reg_t); \
+ proc->register_insn((insn_desc_t){match, mask, rv32_##name, rv64_##name});
+
#endif