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61afc41641
Thanks to simer and Happy for pointing out something that also cropped up in MAME: http://forums.bannister.org/ ubbthreads.php?ubb=showflat&Number=94626#Post94626 This hack fixes Banjo-Kazooie.
85 lines
2.3 KiB
C
85 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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