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120 lines
2.7 KiB
C
120 lines
2.7 KiB
C
/*
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*
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* (c) 2004 Laurent Vivier <LaurentVivier@wanadoo.fr>
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*
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* a lot of parts from penguin booter
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*/
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#include <stdio.h>
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#include "console.h"
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#include "MMU040.h"
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#define GET_TC_ENABLE(TC) (TC & 0x8000)
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#define IS_8K_PAGE(TC) (TC & 0x4000)
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#define GET_TC_PAGE_SIZE(TC) (IS_8K_PAGE(TC) ? 8192 : 4096)
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#define UDT_IS_INVALID(PDT) (!(PDT & 2))
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#define UDT_IS_RESIDENT(PDT) (PDT & 2)
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#define GET_RP_UDT(RP) (RP & 0x00000003)
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#define GET_RP_W(RP) (RP & 0x00000004)
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#define GET_RP_U(RP) (RP & 0x00000008)
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#define GET_RP_ADDR(RP) (RP & 0xFFFFFE00)
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#define GET_TD_4K_ADDR(TD) (TD & 0xFFFFFF00)
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#define GET_TD_8K_ADDR(TD) (TD & 0xFFFFFF80)
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#define TRACE_MMU
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#ifdef TRACE_MMU
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#define TRACE(format, args...) if (MMU_trace) printf(format, ##args)
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static int MMU_trace = 1;
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void MMU040_set_trace(int enable)
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{
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MMU_trace = enable;
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}
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#else
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#define TRACE(format, args...)
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#endif
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int MMU040_logical2physicalAttr(unsigned long logicalAddr, unsigned long *physicalAddr, unsigned long *attr)
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{
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int rootIndex;
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int ptrIndex;
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int pageIndex;
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unsigned long TC;
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unsigned long *rootTable, *ptrTable, *pageTable, *pageAddr;
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unsigned long pAttr;
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unsigned long rootEntry, tableEntry, pageEntry;
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TRACE("logical: %08lx ", logicalAddr);
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MMU040_get_TC(&TC);
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TRACE("TC: %08lx\n", TC);
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rootIndex = (logicalAddr & 0xFE000000) >> 25;
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ptrIndex = (logicalAddr & 0x01FC0000) >> 18;
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pageIndex = IS_8K_PAGE(TC) ? (logicalAddr & 0x0003E000) >> 13 :
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(logicalAddr & 0x0003F000) >> 12;
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TRACE("root idx: %d ptr idx: %d page idx: %d\n", rootIndex, ptrIndex,
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pageIndex);
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MMU040_get_SRP((unsigned long*)&rootTable);
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TRACE("SRP: %p\n", rootTable);
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rootEntry = rootTable[rootIndex];
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if (UDT_IS_INVALID(rootEntry))
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{
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return -1;
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}
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TRACE("Root Entry: %08lx\n", rootEntry);
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ptrTable = (unsigned long*)GET_RP_ADDR(rootEntry);
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tableEntry = ptrTable[ptrIndex];
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if (UDT_IS_INVALID(tableEntry))
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{
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return -1;
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}
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TRACE("table Entry: %08lx\n", tableEntry);
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pageTable = (unsigned long*) ( IS_8K_PAGE(TC) ?
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GET_TD_8K_ADDR(tableEntry) :
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GET_TD_4K_ADDR(tableEntry) );
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pageEntry = pageTable[pageIndex];
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if (IS_8K_PAGE(TC))
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pageAddr = (unsigned long *) (pageEntry & 0xFFFFE000);
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else
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pageAddr = (unsigned long *) (pageEntry & 0xFFFFF000);
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pAttr = pageEntry & 0x000004FF;
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*physicalAddr = (unsigned long)pageAddr;
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*attr = pAttr;
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TRACE("physical: %08lx\n", *physicalAddr);
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return 0;
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}
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int MMU040_logical2physical(unsigned long logicalAddr, unsigned long *physicalAddr)
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{
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unsigned long attr;
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return MMU040_logical2physicalAttr(logicalAddr, physicalAddr, &attr);
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}
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unsigned long MMU040_get_page_size(void)
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{
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unsigned long TC;
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MMU040_get_TC(&TC);
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return GET_TC_PAGE_SIZE(TC);
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}
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