valter/dosbox-staging
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Use special physical memory access for dma transfers

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2086
This commit is contained in:
Sjoerd van der Berg 2004-12-22 19:49:24 +00:00
parent d1d89dc803
commit fba8482ce1
3 changed files with 36 additions and 12 deletions
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11
src/cpu/paging.cpp
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@ -31,7 +31,8 @@
#define LINK_TOTAL (64*1024)
PagingBlock paging;
static Bit32u mapfirstmb[LINK_START];
Bitu PageHandler::readb(PhysPt addr) {
E_Exit("No byte handler for read from %d",addr);
@ -191,7 +192,7 @@ public:
phys_writed(entry_addr,entry.load);
phys_page=entry.block.base;
} else {
if (lin_page<LINK_START) phys_page=mapfirstmb[lin_page];
if (lin_page<LINK_START) phys_page=paging.firstmb[lin_page];
else phys_page=lin_page;
}
PAGING_LinkPage(lin_page,phys_page);
@ -210,7 +211,7 @@ bool PAGING_MakePhysPage(Bitu & page) {
if (!entry.block.p) return false;
page=entry.block.base;
} else {
if (page<LINK_START) page=mapfirstmb[page];
if (page<LINK_START) page=paging.firstmb[page];
//Else keep it the same
}
return true;
@ -275,7 +276,7 @@ void PAGING_LinkPage(Bitu lin_page,Bitu phys_page) {
void PAGING_MapPage(Bitu lin_page,Bitu phys_page) {
if (lin_page<LINK_START) {
mapfirstmb[lin_page]=phys_page;
paging.firstmb[lin_page]=phys_page;
paging.tlb.read[lin_page]=0;
paging.tlb.write[lin_page]=0;
paging.tlb.handler[lin_page]=&init_page_handler;
@ -324,7 +325,7 @@ void PAGING_Init(Section * sec) {
PAGING_InitTLB();
Bitu i;
for (i=0;i<LINK_START;i++) {
mapfirstmb[i]=i;
paging.firstmb[i]=i;
}
pf_queue.used=0;
}