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https://github.com/n64dev/cen64.git
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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)
84 lines
2.3 KiB
C
84 lines
2.3 KiB
C
//
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// rdp/interface.c: RDP interface.
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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 "bus/address.h"
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#include "rdp/cpu.h"
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#include "rdp/interface.h"
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#define DP_XBUS_DMEM_DMA 0x00000001
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#define DP_FREEZE 0x00000002
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#define DP_FLUSH 0x00000004
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#define DP_CLEAR_XBUS_DMEM_DMA 0x00000001
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#define DP_SET_XBUS_DMEM_DMA 0x00000002
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#define DP_CLEAR_FREEZE 0x00000004
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#define DP_SET_FREEZE 0x00000008
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#define DP_CLEAR_FLUSH 0x00000010
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#define DP_SET_FLUSH 0x00000020
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void rdp_process_list(void);
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// Reads a word from the DP MMIO register space.
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int read_dp_regs(void *opaque, uint32_t address, uint32_t *word) {
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struct rdp *rdp = (struct rdp *) opaque;
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uint32_t offset = address - DP_REGS_BASE_ADDRESS;
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enum dp_register reg = (offset >> 2);
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*word = rdp->regs[reg];
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debug_mmio_read(dp, dp_register_mnemonics[reg], *word);
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return 0;
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}
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// Writes a word to the DP MMIO register space.
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int write_dp_regs(void *opaque, uint32_t address, uint32_t word, uint32_t dqm) {
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struct rdp *rdp = (struct rdp *) opaque;
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uint32_t offset = address - DP_REGS_BASE_ADDRESS;
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enum dp_register reg = (offset >> 2);
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debug_mmio_write(dp, dp_register_mnemonics[reg], word, dqm);
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switch (reg) {
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case DPC_START_REG:
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rdp->regs[DPC_CURRENT_REG] = word;
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rdp->regs[DPC_START_REG] = word;
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break;
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case DPC_END_REG:
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rdp->regs[DPC_END_REG] = word;
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rdp_process_list();
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break;
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case DPC_STATUS_REG:
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if (word & DP_CLEAR_XBUS_DMEM_DMA)
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rdp->regs[DPC_STATUS_REG] &= ~DP_XBUS_DMEM_DMA;
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else if (word & DP_SET_XBUS_DMEM_DMA)
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rdp->regs[DPC_STATUS_REG] |= DP_XBUS_DMEM_DMA;
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if (word & DP_CLEAR_FREEZE)
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rdp->regs[DPC_STATUS_REG] &= ~DP_FREEZE;
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// else if (word & DP_SET_FREEZE)
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// rdp->regs[DPC_STATUS_REG] |= DP_FREEZE;
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if (word & DP_CLEAR_FLUSH)
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rdp->regs[DPC_STATUS_REG] &= ~DP_FLUSH;
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else if (word & DP_SET_FLUSH)
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rdp->regs[DPC_STATUS_REG] |= DP_FLUSH;
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break;
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default:
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rdp->regs[reg] &= ~dqm;
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rdp->regs[reg] |= word;
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break;
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}
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return 0;
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}
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