valter/dosbox-staging
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Changed the paging link management

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@1506
This commit is contained in:
Sjoerd van der Berg 2003-12-29 23:07:12 +00:00
parent de536dfae0
commit 5573af89f6
3 changed files with 43 additions and 46 deletions
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30
src/hardware/vga_memory.cpp
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@ -126,34 +126,17 @@ static void VGA_GFX_256U_WriteHandler(PhysPt start,Bit8u val) {
/* Gonna assume that whoever maps vga memory, maps it on 32/64kb boundary */
#define LINK_MAX 64
#define VGA_PAGES (128/4)
#define VGA_PAGE_A0 (0xA0000/4096)
#define VGA_PAGE_B0 (0xB0000/4096)
#define VGA_PAGE_B8 (0xB8000/4096)
static struct {
Bitu used_links;
Bit32u links[LINK_MAX];
Bit8u ram_area[VGA_PAGES*4096];
Bitu map_base;
} vgapages;
void VGA_ClearPageLinks(void) {
PAGING_ClearTLBEntries(vgapages.used_links,vgapages.links);
vgapages.used_links=0;
}
class VGA_PageHandler : public PageHandler {
void AddPageLink(Bitu lin_page, Bitu phys_page) {
if (vgapages.used_links<LINK_MAX) {
vgapages.links[vgapages.used_links++]=lin_page;
}
}
};
class VGARead_PageHandler : public VGA_PageHandler {
class VGARead_PageHandler : public PageHandler {
public:
Bitu readb(PhysPt addr) {
addr&=0xffff;
@ -221,7 +204,7 @@ public:
}
};
class VGA_TEXT_PageHandler : public VGA_PageHandler {
class VGA_TEXT_PageHandler : public PageHandler {
public:
VGA_TEXT_PageHandler() {
flags=PFLAG_NOCODE;
@ -239,7 +222,7 @@ public:
};
class VGA_RAM_PageHandler : public VGA_PageHandler {
class VGA_RAM_PageHandler : public PageHandler {
public:
VGA_RAM_PageHandler() {
flags=PFLAG_READABLE|PFLAG_WRITEABLE|PFLAG_NOCODE;
@ -250,7 +233,7 @@ public:
}
};
class VGA_MAP_PageHandler : public VGA_PageHandler {
class VGA_MAP_PageHandler : public PageHandler {
public:
VGA_MAP_PageHandler() {
flags=PFLAG_READABLE|PFLAG_WRITEABLE|PFLAG_NOCODE;
@ -261,7 +244,7 @@ public:
}
};
class VGA_TANDY_PageHandler : public VGA_PageHandler {
class VGA_TANDY_PageHandler : public PageHandler {
public:
VGA_TANDY_PageHandler() {
flags=PFLAG_READABLE|PFLAG_WRITEABLE|PFLAG_NOCODE;
@ -340,7 +323,7 @@ void VGA_SetupHandlers(void) {
MEM_SetPageHandler(VGA_PAGE_B0,8,&vgaph.hram);
break;
}
VGA_ClearPageLinks();
PAGING_ClearTLB();
}
bool lfb_update;
@ -359,5 +342,4 @@ void VGA_StartUpdateLFB(void) {
void VGA_SetupMemory() {
memset((void *)&vga.mem,0,512*1024*4);
vgapages.used_links=0;
}