mirror of https://github.com/PCSX2/pcsx2.git
122 lines
4.7 KiB
C++
122 lines
4.7 KiB
C++
/* PCSX2 - PS2 Emulator for PCs
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* Copyright (C) 2002-2010 PCSX2 Dev Team
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*
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* PCSX2 is free software: you can redistribute it and/or modify it under the terms
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* of the GNU Lesser General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* PCSX2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with PCSX2.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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namespace Ps2MemSize
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{
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static const uint MainRam = _32mb; // 32 MB main memory!
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static const uint Rom = _1mb * 4; // 4 MB main rom
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static const uint Rom1 = 0x00040000; // DVD player
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static const uint Rom2 = 0x00080000; // Chinese rom extension (?)
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static const uint ERom = 0x001C0000; // DVD player extensions (?)
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static const uint Hardware = _64kb;
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static const uint Scratch = _16kb;
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static const uint IopRam = _1mb * 2; // 2MB main ram on the IOP.
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static const uint IopHardware = _64kb;
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static const uint GSregs = 0x00002000; // 8k for the GS registers and stuff.
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}
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typedef u8 mem8_t;
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typedef u16 mem16_t;
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typedef u32 mem32_t;
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typedef u64 mem64_t;
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typedef u128 mem128_t;
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// --------------------------------------------------------------------------------------
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// Future-Planned VTLB pagefault scheme!
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// --------------------------------------------------------------------------------------
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// When enabled, the VTLB will use a large-area reserved memory range of 512megs for EE
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// physical ram/rom access. The base ram will be committed at 0x00000000, and ROMs will be
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// at 0x1fc00000, etc. All memory ranges in between will be uncommitted memory -- which
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// means that the memory will *not* count against the operating system's physical memory
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// pool.
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//
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// When the VTLB generates memory operations (loads/stores), it will assume that the op
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// is addressing either RAM or ROM, and by assuming that it can generate a completely efficient
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// direct memory access (one AND and one MOV instruction). If the access is to another area of
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// memory, such as hardware registers or scratchpad, the access will generate a page fault, the
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// compiled block will be cleared and re-compiled using "full" VTLB translation logic.
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//
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// Note that support for this feature may not be doable under x86/32 platforms, due to the
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// 2gb/3gb limit of Windows XP (the 3gb feature will make it slightly more feasible at least).
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//
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#define VTLB_UsePageFaulting 0
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#if VTLB_UsePageFaulting
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// The order of the components in this struct *matter* -- it has been laid out so that the
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// full breadth of PS2 RAM and ROM mappings are directly supported.
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struct EEVM_MemoryAllocMess
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{
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u8 (&Main)[Ps2MemSize::MainRam]; // Main memory (hard-wired to 32MB)
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u8 _padding1[0x1e000000-Ps2MemSize::MainRam]
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u8 (&ROM1)[Ps2MemSize::Rom1]; // DVD player
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u8 _padding2[0x1e040000-(0x1e000000+Ps2MemSize::Rom1)]
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u8 (&EROM)[Ps2MemSize::ERom]; // DVD player extensions
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u8 _padding3[0x1e400000-(0x1e040000+Ps2MemSize::EROM)]
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u8 (&ROM2)[Ps2MemSize::Rom2]; // Chinese extensions
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u8 _padding4[0x1fc00000-(0x1e040000+Ps2MemSize::Rom2)];
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u8 (&ROM)[Ps2MemSize::Rom]; // Boot rom (4MB)
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};
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#else
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struct EEVM_MemoryAllocMess
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{
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u8 Main[Ps2MemSize::MainRam]; // Main memory (hard-wired to 32MB)
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u8 Scratch[Ps2MemSize::Scratch]; // Scratchpad!
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u8 ROM[Ps2MemSize::Rom]; // Boot rom (4MB)
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u8 ROM1[Ps2MemSize::Rom1]; // DVD player
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u8 ROM2[Ps2MemSize::Rom2]; // Chinese extensions
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u8 EROM[Ps2MemSize::ERom]; // DVD player extensions
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// Two 1 megabyte (max DMA) buffers for reading and writing to high memory (>32MB).
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// Such accesses are not documented as causing bus errors but as the memory does
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// not exist, reads should continue to return 0 and writes should be discarded.
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// Probably.
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u8 ZeroRead[_1mb];
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u8 ZeroWrite[_1mb];
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};
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#endif
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struct IopVM_MemoryAllocMess
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{
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u8 Main[Ps2MemSize::IopRam]; // Main memory (hard-wired to 2MB)
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u8 P[_64kb]; // I really have no idea what this is... --air
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u8 Sif[0x100]; // a few special SIF/SBUS registers (likely not needed)
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};
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// DevNote: EE and IOP hardware registers are done as a static array instead of a pointer in
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// order to allow for simpler macros and reference handles to be defined (we can safely use
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// compile-time references to registers instead of having to use instance variables).
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extern __pagealigned u8 eeHw[Ps2MemSize::Hardware];
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extern __pagealigned u8 iopHw[Ps2MemSize::IopHardware];
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extern EEVM_MemoryAllocMess* eeMem;
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extern IopVM_MemoryAllocMess* iopMem;
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