mirror of
https://github.com/extremscorner/not64.git
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155 lines
3.7 KiB
C
155 lines
3.7 KiB
C
/**
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* Mupen64 - tlb.c
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* Copyright (C) 2002 Hacktarux
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*
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* Mupen64 homepage: http://mupen64.emulation64.com
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* email address: hacktarux@yahoo.fr
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*
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* If you want to contribute to the project please contact
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* me first (maybe someone is already making what you are
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* planning to do).
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*
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*
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* This program is free software; you can redistribute it and/
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* or modify it under the terms of the GNU General Public Li-
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* cence as published by the Free Software Foundation; either
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* version 2 of the Licence, or any later version.
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*
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* This program is distributed in the hope that it will be use-
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* ful, but WITHOUT ANY WARRANTY; without even the implied war-
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* ranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public Licence for more details.
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*
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* You should have received a copy of the GNU General Public
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* Licence along with this program; if not, write to the Free
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* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
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* USA.
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*
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**/
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#include "memory.h"
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#include "../r4300/r4300.h"
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#include "../r4300/exception.h"
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#include "../r4300/macros.h"
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#include "TLB-Cache.h"
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#ifdef USE_EXPANSION
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#define MEMMASK 0x7FFFFF
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#define TOPOFMEM 0x800000
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#else
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#define MEMMASK 0x3FFFFF
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#define TOPOFMEM 0x400000
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#endif
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#ifndef USE_TLB_CACHE
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#include "MEM2.h"
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unsigned long *const tlb_LUT_r = (unsigned long*)(TLBLUT_LO);
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unsigned long *const tlb_LUT_w = (unsigned long*)(TLBLUT_LO+0x400000);
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#endif
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#ifndef USE_TLB_CACHE
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void tlb_mem2_init()
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{
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long i;
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for(i = 0; i<(0x400000/4); i++)
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{
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tlb_LUT_r[i] = 0;
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tlb_LUT_w[i] = 0;
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}
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}
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#endif
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extern unsigned long interp_addr;
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unsigned long virtual_to_physical_address(unsigned long addresse, int w)
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{
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if (w == 1)
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{
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#ifdef USE_TLB_CACHE
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unsigned long paddr = TLBCache_get_w(addresse>>12);
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if(paddr) return (paddr&0xFFFFF000)|(addresse&0xFFF);
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#else
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if (tlb_LUT_w[addresse>>12])
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return (tlb_LUT_w[addresse>>12]&0xFFFFF000)|(addresse&0xFFF);
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#endif
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}
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else
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{
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#ifdef USE_TLB_CACHE
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unsigned long paddr = TLBCache_get_r(addresse>>12);
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if(paddr) return (paddr&0xFFFFF000)|(addresse&0xFFF);
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#else
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if (tlb_LUT_r[addresse>>12])
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return (tlb_LUT_r[addresse>>12]&0xFFFFF000)|(addresse&0xFFF);
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#endif
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}
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//printf("tlb exception !!! @ %x, %x, add:%x\n", addresse, w, interp_addr);
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//getchar();
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TLB_refill_exception(addresse,w);
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//return 0x80000000;
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return 0x00000000;
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/*int i;
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for (i=0; i<32; i++)
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{
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if ((tlb_e[i].vpn2 & ~(tlb_e[i].mask))
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== ((addresse >> 13) & ~(tlb_e[i].mask)))
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{
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if (tlb_e[i].g || (tlb_e[i].asid == (EntryHi & 0xFF)))
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{
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if (addresse & tlb_e[i].check_parity_mask)
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{
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if (tlb_e[i].v_odd)
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{
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if (tlb_e[i].d_odd && w)
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{
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TLB_mod_exception();
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return 0;
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}
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return ((addresse & ((tlb_e[i].mask << 12)|0xFFF))
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| ((tlb_e[i].pfn_odd << 12) &
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~((tlb_e[i].mask << 12)|0xFFF))
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| 0x80000000);
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}
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else
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{
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TLB_invalid_exception();
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return 0;
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}
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}
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else
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{
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if (tlb_e[i].v_even)
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{
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if (tlb_e[i].d_even && w)
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{
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TLB_mod_exception();
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return 0;
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}
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return ((addresse & ((tlb_e[i].mask << 12)|0xFFF))
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| ((tlb_e[i].pfn_even << 12) &
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~((tlb_e[i].mask << 12)|0xFFF))
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| 0x80000000);
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}
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else
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{
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TLB_invalid_exception();
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return 0;
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}
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}
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}
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else
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{
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printf("tlb refill inconnu\n");
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TLB_refill_exception(addresse,w);
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}
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}
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}
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BadVAddr = addresse;
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TLB_refill_exception(addresse,w);
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//printf("TLB refill exception\n");
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return 0x80000000;*/
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}
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int probe_nop(unsigned long address)
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{
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return *fast_mem_access(address) == 0;
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}
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