mirror of
https://github.com/dborth/snes9xgx.git
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91 lines
1.9 KiB
C
91 lines
1.9 KiB
C
/* Copyright 2013 tueidj All Rights Reserved
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* This code may not be used in any project
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* without explicit permission from the author.
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*/
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#ifndef _VM_H_
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#define _VM_H_
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#include <gccore.h>
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#include <stdlib.h>
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#include <malloc.h>
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#include <errno.h>
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#include <ogc/machine/processor.h>
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#include <stdio.h>
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#define KB (1024)
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#define MB (1024*KB)
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#define MRAM_BACKING (4*MB) // Use 4MB to page our 16MB
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#define ARAM_RESERVED (64*KB) // Reserved for DSP/AESND/etc
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#define ARAM_VM_BASE (0x7F000000) // Map ARAM to here
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#define ARAM_START (ARAM_RESERVED + ARAM_VM_BASE)
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#define ARAM_SIZE ((16*MB) - ARAM_RESERVED) // ARAM is ~16MB
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// maximum virtual memory size
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#define MAX_VM_SIZE (256*1024*1024)
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// maximum physical memory size
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#define MAX_MEM_SIZE ( 8*1024*1024)
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// minimum physical memory size
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#define MIN_MEM_SIZE (256*1024)
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// page size as defined by hardware
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#define PAGE_SIZE 4096
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#define PAGE_MASK (~(PAGE_SIZE-1))
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#define VM_VSID 0
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#define VM_SEGMENT 0x70000000
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// use 64KB for PTEs
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#define HTABMASK 0
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#define PTE_SIZE ((HTABMASK+1)*65536)
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#define PTE_COUNT (PTE_SIZE>>3)
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//#define VM_FILENAME "/tmp/pagefile.sys"
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// keeps a record of each currently mapped page
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typedef union
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{
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u32 data;
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struct
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{
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u32 valid : 1;
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u32 locked : 1;
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u32 dirty : 1;
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u32 pte_index : 13;
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u32 page_index : 16;
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};
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} p_map;
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// maps VM addresses to mapped pages
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typedef struct
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{
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// data must be fetched when paging in?
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u16 committed : 1;
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u16 p_map_index: 12;
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} vm_map;
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typedef union
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{
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u32 data[2];
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struct
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{
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u32 valid : 1;
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u32 VSID : 24;
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u32 hash : 1;
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u32 API : 6;
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u32 RPN : 20;
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u32 pad0 : 3;
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u32 R : 1;
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u32 C : 1;
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u32 WIMG : 4;
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u32 pad1 : 1;
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u32 PP : 2;
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};
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} PTE;
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typedef PTE* PTEG;
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extern void* VM_Init(u32 VMSize, u32 MEMSize);
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extern void VM_Deinit(void);
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#endif
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