68 lines
1.1 KiB
C++
68 lines
1.1 KiB
C++
#pragma once
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#include <optional>
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#include "rv_types.h"
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class RVCSR {
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// Current core privilege level (M/S/U)
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uint priv;
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ux_t mcycle;
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ux_t mcycleh;
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ux_t minstret;
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ux_t minstreth;
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ux_t mcountinhibit;
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ux_t mstatus;
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ux_t mie;
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ux_t mip;
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ux_t mtvec;
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ux_t mscratch;
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ux_t mepc;
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ux_t mcause;
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std::optional<ux_t> pending_write_addr;
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ux_t pending_write_data;
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public:
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enum {
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WRITE = 0,
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WRITE_SET = 1,
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WRITE_CLEAR = 2
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};
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RVCSR() {
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priv = 3;
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mcycle = 0;
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mcycleh = 0;
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minstret = 0;
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minstreth = 0;
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mcountinhibit = 0;
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mstatus = 0;
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mie = 0;
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mip = 0;
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mtvec = 0;
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mscratch = 0;
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mepc = 0;
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mcause = 0;
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pending_write_addr = {};
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}
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void step();
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// Returns None on permission/decode fail
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std::optional<ux_t> read(uint16_t addr, bool side_effect=true);
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// Returns false on permission/decode fail
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bool write(uint16_t addr, ux_t data, uint op=WRITE);
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// Update trap state (including change of privilege level), return trap target PC
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ux_t trap_enter(uint xcause, ux_t xepc);
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// Update trap state, return mepc:
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ux_t trap_mret();
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uint getpriv() {
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return priv;
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}
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};
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