85 lines
2.1 KiB
C++
85 lines
2.1 KiB
C++
/*
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Copyright 2023 flyinghead
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This file is part of Flycast.
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Flycast is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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Flycast is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Flycast. If not, see <https://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "types.h"
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#include "sh4_opcode_list.h"
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#include "sh4_if.h"
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#include "sh4_sched.h"
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class Sh4Cycles
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{
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public:
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Sh4Cycles(int cpuRatio = 1) : cpuRatio(cpuRatio) {}
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void init(Sh4Context *ctx) {
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this->ctx = ctx;
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}
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void executeCycles(u16 op)
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{
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ctx->cycle_counter -= countCycles(op);
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}
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void addCycles(int cycles) const
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{
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ctx->cycle_counter -= cycles;
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}
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void addReadAccessCycles(u32 addr, u32 size) const
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{
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ctx->cycle_counter -= readAccessCycles(addr, size);
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}
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void addWriteAccessCycles(u32 addr, u32 size) const
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{
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ctx->cycle_counter -= writeAccessCycles(addr, size);
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}
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int countCycles(u16 op);
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void reset()
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{
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lastUnit = CO;
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memOps = 0;
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}
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u64 now() {
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return sh4_sched_now64() + SH4_TIMESLICE - ctx->cycle_counter;
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}
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int readAccessCycles(u32 addr, u32 size) const {
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return readExternalAccessCycles(addr, size) * 2 * cpuRatio;
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}
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int writeAccessCycles(u32 addr, u32 size) const {
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return writeExternalAccessCycles(addr, size) * 2 * cpuRatio;
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}
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private:
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// Returns the number of external cycles (100 MHz) needed for a sized read at the given address
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static int readExternalAccessCycles(u32 addr, u32 size);
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// Returns the number of external cycles (100 MHz) needed for a sized write at the given address
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static int writeExternalAccessCycles(u32 addr, u32 size);
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sh4_eu lastUnit = CO;
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const int cpuRatio;
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int memOps = 0;
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Sh4Context *ctx = nullptr;
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};
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