mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 02:11:36 -04:00
Matthew Stanley
64 lines
2.3 KiB
C
64 lines
2.3 KiB
C
#ifndef PSXRECOMP_MOD_MEMORY_H
|
|
#define PSXRECOMP_MOD_MEMORY_H
|
|
|
|
#include <stdint.h>
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/*
|
|
* GPU linked-list tags carry only 24 address bits. Trusted enhancements that
|
|
* need a larger primitive arena use this otherwise-unmapped 8 MiB aperture so
|
|
* their CPU pointers survive the tag truncation. Nothing is mapped until an
|
|
* enhancement explicitly allocates from it.
|
|
*/
|
|
#define PSX_MOD_GPU_DMA_APERTURE_BASE 0x00800000u
|
|
#define PSX_MOD_GPU_DMA_APERTURE_SIZE (8u * 1024u * 1024u)
|
|
#define PSX_MOD_GPU_DMA_GUEST_BASE 0x80800000u
|
|
|
|
static inline int psx_mod_gpu_dma_aperture_offset_for(
|
|
uint32_t address, uint32_t width, uint32_t used, uint32_t *offset) {
|
|
/* CPU addresses retain all physical bits after KSEG normalization. The
|
|
* BIOS at 0x1FC00000 must never alias the enhancement aperture.
|
|
* DMA callers pass an already-truncated 24-bit tag separately below. */
|
|
uint32_t canonical = address & 0x1FFFFFFFu;
|
|
uint32_t off;
|
|
if (canonical < PSX_MOD_GPU_DMA_APERTURE_BASE ||
|
|
canonical >= 0x01000000u || used > PSX_MOD_GPU_DMA_APERTURE_SIZE)
|
|
return 0;
|
|
off = canonical - PSX_MOD_GPU_DMA_APERTURE_BASE;
|
|
if (off > used || width > used - off) return 0;
|
|
if (offset) *offset = off;
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Preserve the retail DMAC's 2 MiB folding unless the address is inside the
|
|
* portion of the enhancement aperture that has actually been allocated.
|
|
*/
|
|
static inline uint32_t psx_mod_gpu_dma_resolve_address_for(
|
|
uint32_t address, uint32_t used) {
|
|
uint32_t canonical = address & 0x00FFFFFCu;
|
|
if (psx_mod_gpu_dma_aperture_offset_for(
|
|
canonical, 4u, used, (uint32_t *)0))
|
|
return canonical;
|
|
return canonical & 0x001FFFFCu;
|
|
}
|
|
|
|
uint32_t psx_mod_gpu_dma_memory_alloc(uint32_t size, uint32_t alignment);
|
|
uint32_t psx_mod_gpu_dma_resolve_address(uint32_t address);
|
|
uint32_t psx_mod_memory_alloc(uint32_t size, uint32_t alignment);
|
|
/* Allocations are fixed during activation. Snapshot allocated bytes, never
|
|
* host pointers; immutable host assets are reconstructed separately. */
|
|
uint32_t psx_mod_memory_snapshot_bytes(void);
|
|
void psx_mod_memory_snapshot_write(uint8_t* out);
|
|
int psx_mod_memory_snapshot_read(const uint8_t* data, uint32_t size);
|
|
uint32_t psx_mod_memory_layout_cookie(void);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|