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c4afd44ed7
Replaced all references to simulation with emulation Updated copyright year Updated .gitignore to reduce chances of random files being uploaded to the repo Added .gitattributes to normalize all text files, and to ignore binary files (which includes the logo and the NEC PDF)
90 lines
1.8 KiB
C
90 lines
1.8 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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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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// 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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