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111 lines
2.1 KiB
C
111 lines
2.1 KiB
C
//
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// rsp/cp2.c: RSP control coprocessor.
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//
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// CEN64: Cycle-Accurate Nintendo 64 Emulator.
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// Copyright (C) 2015, Tyler J. Stachecki.
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//
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// This file is subject to the terms and conditions defined in
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// 'LICENSE', which is part of this source code package.
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//
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#include "common.h"
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#include "rsp/cpu.h"
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#include "rsp/rsp.h"
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//
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// CFC2
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//
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void RSP_CFC2(struct rsp *rsp,
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uint32_t iw, uint32_t rs, uint32_t rt) {
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struct rsp_exdf_latch *exdf_latch = &rsp->pipeline.exdf_latch;
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struct rsp_cp2 *cp2 = &rsp->cp2;
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unsigned rd, dest, src;
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dest = GET_RT(iw);
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rd = GET_RD(iw);
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// TODO: verify on hardware
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if ((src = rd & 0x3) == 0x3)
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src = 2;
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exdf_latch->result.result = rsp_get_flags(cp2->flags[src].e);
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exdf_latch->result.dest = dest;
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}
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//
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// CTC2
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//
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void RSP_CTC2(struct rsp *rsp,
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uint32_t iw, uint32_t rs, uint32_t rt) {
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struct rsp_cp2 *cp2 = &rsp->cp2;
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unsigned rd, dest;
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rd = GET_RD(iw);
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// TODO: verify on hardware
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if ((dest = rd & 0x3) >= 0x2) {
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rt &= 0xFF;
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dest = 2;
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}
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rsp_set_flags(cp2->flags[dest].e, rt);
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}
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//
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// MFC2
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//
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void RSP_MFC2(struct rsp *rsp,
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uint32_t iw, uint32_t rs, uint32_t rt) {
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struct rsp_exdf_latch *exdf_latch = &rsp->pipeline.exdf_latch;
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const uint16_t *e = rsp->cp2.regs[GET_RD(iw)].e;
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unsigned dest, element = GET_EL(iw);
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unsigned lo = element >> 1;
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uint32_t data;
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uint16_t high;
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uint8_t low;
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dest = GET_RT(iw);
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if (element & 0x1) {
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unsigned hi = (element + 1) >> 1;
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high = e[lo] << 8;
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low = e[hi] >> 8;
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data = (int16_t) (high | low);
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}
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else
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data = (int16_t) e[lo];
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exdf_latch->result.result = data;
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exdf_latch->result.dest = dest;
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}
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//
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// MTC2
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//
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void RSP_MTC2(struct rsp *rsp,
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uint32_t iw, uint32_t rs, uint32_t rt) {
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uint16_t *e = rsp->cp2.regs[GET_RD(iw)].e;
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unsigned element = GET_EL(iw);
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unsigned lo = element >> 1;
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if (element & 0x1) {
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unsigned hi = (element + 1) >> 1;
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e[lo] = (e[lo] & 0xFF00) | (rt >> 8 & 0xFF);
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e[hi] = (e[hi] & 0x00FF) | ((rt & 0xFF) << 8);
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}
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else
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e[lo] = rt;
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}
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// Initializes the coprocessor.
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void rsp_cp2_init(struct rsp *rsp) {
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}
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