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Check for illegal pages being linked

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New physical page read function


Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@1450
This commit is contained in:
Sjoerd van der Berg 2003-11-18 22:31:03 +00:00
parent 09366aa37f
commit 27fd691fff
1 changed files with 21 additions and 5 deletions
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26
src/hardware/memory.cpp
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@ -70,10 +70,20 @@ static struct MemoryBlock {
class IllegalPageHandler : public PageHandler {
public:
void AddPageLink(Bitu lin_page, Bitu phys_page) {
}
IllegalPageHandler() {
flags=0;
flags=PFLAG_ILLEGAL|PFLAG_NOCODE;
}
Bitu readb(PhysPt addr) {
LOG_MSG("Illegal read from %x",addr);
return 0;
}
void writeb(PhysPt addr,Bitu val) {
LOG_MSG("Illegal write to %x",addr);
}
HostPt GetHostPt(Bitu phys_page) {
return 0;
}
};
@ -134,7 +144,7 @@ PageHandler * MEM_GetPageHandler(Bitu phys_page) {
} else if ((phys_page>=memory.lfb.start_page) && (phys_page<memory.lfb.end_page)) {
return &lfb_page_handler;
}
return 0;
return &illegal_page_handler;
}
void MEM_SetPageHandler(Bitu phys_page,Bitu pages,PageHandler * handler) {
@ -482,8 +492,14 @@ void phys_writed(PhysPt addr,Bit32u val) {
phys_writeb(addr+3,(Bit8u)(val >> 24));
}
Bit32u phys_page_readd(Bitu page,Bitu index) {
return 0;
Bit32u MEM_PhysReadD(Bitu addr) {
Bitu page=addr >> 12;
Bitu index=(addr & 4095);
HostPt block=memory.hostpts[page];
if (!block) {
E_Exit("Reading from empty page");
}
return host_readd(block+index);
}