mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 18:25:35 -04:00
Matthew Stanley
70e7e7aea2
Root cause of VSync counter stuck at 0: DMA completion IRQs were deliberately suppressed in dma.c, preventing the shell's chain-E004 handler (func_1FC40628) from ever seeing I_STAT bit 3. The handler gates all VBlank callback processing on DMA interrupt presence. Changes: - dma.c: directly assert i_stat bit 3 on DMA ch2/ch6 completion (bypass DICR edge detection which gets stuck because the shell handler only acknowledges ch3 in DICR, not ch2/ch6) - dma.c: expose dma_get_dicr()/dma_get_dpcr() for debug server - memory.c: add DMA register range (0x1F801080-0x1F8010FF) to mmio_read8/write8/read16/write16 — fixes crash on DICR byte read - debug_server.c: add DPCR/DICR to irq_state command - seeds: add 0xBFC42BA0 (shell_vblank_dispatch), 0xBFC38AF0 (shell hot function, 178 misses), 0xBFC137D0 (kernel RAM), 0xBFC42BE0 (shell_vblank_process), 0xBFC4226C (mid-function callback loop) - regen: 1051 dispatch entries (was 1046) Verified: chain-E004 handler + verify now dispatch. VSync counter still 0 because the VBlank callback loop inside func_1FC42160 is gated by an init-done flag and the mid-function entry mechanism is not yet resolved. New EvCB crash at BFC12A84 exposed by DMA IRQ — next session. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
37 lines
798 B
C
37 lines
798 B
C
/* dma.h — PS1 DMA controller simulation (Phase 3).
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*
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* 7 DMA channels:
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* Ch0: MDEC in 0x1F801080
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* Ch1: MDEC out 0x1F801090
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* Ch2: GPU 0x1F8010A0
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* Ch3: CDROM 0x1F8010B0
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* Ch4: SPU 0x1F8010C0
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* Ch5: PIO 0x1F8010D0
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* Ch6: OTC 0x1F8010E0
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*
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* Global:
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* DPCR: 0x1F8010F0 (DMA control — enable bits per channel)
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* DICR: 0x1F8010F4 (DMA interrupt control)
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*/
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#ifndef PSXRECOMP_V4_DMA_H
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#define PSXRECOMP_V4_DMA_H
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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void dma_init(void);
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uint32_t dma_read(uint32_t addr);
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void dma_write(uint32_t addr, uint32_t val);
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uint32_t dma_get_dicr(void);
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uint32_t dma_get_dpcr(void);
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#ifdef __cplusplus
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}
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#endif
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#endif /* PSXRECOMP_V4_DMA_H */
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