mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 02:11:36 -04:00
Matthew Stanley
52 lines
1.6 KiB
C
52 lines
1.6 KiB
C
#ifndef PSXRECOMP_MOD_MEMORY_H
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#define PSXRECOMP_MOD_MEMORY_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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/*
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* GPU linked-list tags carry only 24 address bits. Trusted enhancements that
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* need a larger primitive arena use this otherwise-unmapped 1 MiB aperture so
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* their CPU pointers survive the tag truncation. Nothing is mapped until an
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* enhancement explicitly allocates from it.
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*/
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#define PSX_MOD_GPU_DMA_APERTURE_BASE 0x00F00000u
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#define PSX_MOD_GPU_DMA_APERTURE_SIZE (1u * 1024u * 1024u)
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#define PSX_MOD_GPU_DMA_GUEST_BASE 0x80F00000u
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static inline int psx_mod_gpu_dma_aperture_offset_for(
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uint32_t address, uint32_t width, uint32_t used, uint32_t *offset) {
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uint32_t canonical = address & 0x00FFFFFFu;
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uint32_t off;
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if (canonical < PSX_MOD_GPU_DMA_APERTURE_BASE) return 0;
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off = canonical - PSX_MOD_GPU_DMA_APERTURE_BASE;
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if (off > used || width > used - off) return 0;
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if (offset) *offset = off;
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return 1;
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}
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/*
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* Preserve the retail DMAC's 2 MiB folding unless the address is inside the
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* portion of the enhancement aperture that has actually been allocated.
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*/
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static inline uint32_t psx_mod_gpu_dma_resolve_address_for(
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uint32_t address, uint32_t used) {
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uint32_t canonical = address & 0x00FFFFFCu;
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if (psx_mod_gpu_dma_aperture_offset_for(
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canonical, 4u, used, (uint32_t *)0))
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return canonical;
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return canonical & 0x001FFFFCu;
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}
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uint32_t psx_mod_gpu_dma_memory_alloc(uint32_t size, uint32_t alignment);
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uint32_t psx_mod_gpu_dma_resolve_address(uint32_t address);
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#ifdef __cplusplus
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}
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#endif
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#endif
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