forked from Ports/goldeneye-pc-port
James Dansereau
88bcef32a3
Uncached getenv per vertex batch (D473), fast3d micro-optimisations (D474), hitch diagnosis (D475), CI4 palette-bank cache key (D476), spike counters, CI8 palette churn measurement (D477). Dead diagnostic probes removed. Refs: D473 D474 D475 D476 D477 GE_PERFSTAT
45 lines
1.7 KiB
C
45 lines
1.7 KiB
C
/*
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* PC port shim for PR/os.h — DRAM address conversions (see docs/internals.md).
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*
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* The game's working RAM lives in the s32-safe DRAM view at 0x70000000
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* ("V1"), with a byte-identical KSEG0 mirror at 0x80000000 ("V2"); see
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* port/src/dram.c. Addresses with bit 31 set sign-extend to invalid
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* pointers through s32 parameters (src/memp.c), so live pointers must stay
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* in V1, while `offset | 0x80000000` rebuilds (src/game/bg.c) must land in
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* V2. The two views share one backing store, so both are the same data.
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*
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* "Physical" addresses in GBI words and ROM data are therefore OFFSETS FROM
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* THE V1 BASE, and the conversions become:
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*
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* OS_K0_TO_PHYSICAL(x) = (u32)((char *)x - 0x70000000)
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* small offset P; fast3d's seg_addr() resolves it with +0x80000000,
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* landing in V2. `P | 0x80000000` (bg.c et al.) also lands in V2.
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* OS_PHYSICAL_TO_K0(x) = x (identity)
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* Callers pass EITHER live V1 pointers (bondview2.c, front.c) — which
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* then go into GBI words as full addresses that fast3d passes through
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* — OR small physical offsets, which fast3d remaps to V2. Both forms
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* resolve correctly.
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* osVirtualToPhysical / osPhysicalToVirtual stay the identity (port/src/
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* libultra.c): V1 addresses are already live host pointers < 4 GB.
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*
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* Inert in the N64 build (no -DPORT): pure pass-through.
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*/
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#ifndef _PORT_SHIM_OS_H_
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#define _PORT_SHIM_OS_H_
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#include "portaddr.h"
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#if defined(PORT)
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# include "include/PR/os.h"
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# undef OS_K0_TO_PHYSICAL
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# define OS_K0_TO_PHYSICAL(x) ((u32)((char *)(x) - PORT_DRAM_V1_BASE))
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# undef OS_PHYSICAL_TO_K0
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# define OS_PHYSICAL_TO_K0(x) ((void *)(x))
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#else
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# include <PR/os.h>
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#endif
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#endif /* _PORT_SHIM_OS_H_ */
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