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New call to reset page handlers

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Change the vga font text page handler and rewrite for reset page handler call.


Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2020
This commit is contained in:
Sjoerd van der Berg 2004-10-12 10:45:11 +00:00
parent 7c32c974c7
commit 93a8163a4d
3 changed files with 27 additions and 33 deletions
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7
src/hardware/memory.cpp
View file

@ -141,6 +141,13 @@ void MEM_SetPageHandler(Bitu phys_page,Bitu pages,PageHandler * handler) {
}
}
void MEM_ResetPageHandler(Bitu phys_page, Bitu pages) {
for (;pages>0;pages--) {
memory.phandlers[phys_page]=&ram_page_handler;
phys_page++;
}
}
Bitu mem_strlen(PhysPt pt) {
Bitu x=0;
while (x<1024) {

48
src/hardware/vga_memory.cpp
View file

@ -15,9 +15,6 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdlib.h>
#include <string.h>
@ -135,8 +132,7 @@ static void VGA_GFX_256U_WriteHandler(PhysPt start,Bit8u val) {
#define VGA_PAGE_B8 (0xB8000/4096)
static struct {
Bit8u ram_area[VGA_PAGES*4096];
Bitu map_base;
Bitu base,mask;
} vgapages;
class VGARead_PageHandler : public PageHandler {
@ -213,37 +209,24 @@ public:
flags=PFLAG_NOCODE;
}
Bitu readb(PhysPt addr) {
addr&=0xffff;
addr&=vgapages.mask;
return vga.draw.font[addr];
}
void writeb(PhysPt addr,Bitu val){
addr&=0xffff;
addr&=vgapages.mask;
if (vga.seq.map_mask & 0x4) {
vga.draw.font[addr]=(Bit8u)val;
}
}
};
class VGA_RAM_PageHandler : public PageHandler {
public:
VGA_RAM_PageHandler() {
flags=PFLAG_READABLE|PFLAG_WRITEABLE|PFLAG_NOCODE;
}
HostPt GetHostPt(Bitu phys_page) {
phys_page-=VGA_PAGE_A0;
return &vgapages.ram_area[phys_page*4096];
}
};
class VGA_MAP_PageHandler : public PageHandler {
public:
VGA_MAP_PageHandler() {
flags=PFLAG_READABLE|PFLAG_WRITEABLE|PFLAG_NOCODE;
}
HostPt GetHostPt(Bitu phys_page) {
phys_page-=vgapages.map_base;
phys_page-=vgapages.base;
return &vga.mem.linear[vga.s3.bank*64*1024+phys_page*4096];
}
};
@ -327,7 +310,6 @@ public:
static struct vg {
VGA_RAM_PageHandler hram;
VGA_MAP_PageHandler hmap;
VGA_TEXT_PageHandler htext;
VGA_TANDY_PageHandler htandy;
@ -380,27 +362,31 @@ void VGA_SetupHandlers(void) {
}
switch ((vga.gfx.miscellaneous >> 2) & 3) {
case 0:
vgapages.map_base=VGA_PAGE_A0;
vgapages.base=VGA_PAGE_A0;
vgapages.mask=0x1ffff;
MEM_SetPageHandler(VGA_PAGE_A0,32,range_handler);
break;
case 1:
vgapages.map_base=VGA_PAGE_A0;
vgapages.base=VGA_PAGE_A0;
vgapages.mask=0xffff;
MEM_SetPageHandler(VGA_PAGE_A0,16,range_handler);
MEM_SetPageHandler(VGA_PAGE_B0,16,&vgaph.hram);
MEM_ResetPageHandler(VGA_PAGE_B0,16);
break;
case 2:
range_b000:
vgapages.map_base=VGA_PAGE_B0;
vgapages.base=VGA_PAGE_B0;
vgapages.mask=0x7fff;
MEM_SetPageHandler(VGA_PAGE_B0,8,range_handler);
MEM_SetPageHandler(VGA_PAGE_A0,16,&vgaph.hram);
MEM_SetPageHandler(VGA_PAGE_B8,8,&vgaph.hram);
MEM_ResetPageHandler(VGA_PAGE_A0,16);
MEM_ResetPageHandler(VGA_PAGE_B8,8);
break;
case 3:
range_b800:
vgapages.map_base=VGA_PAGE_B8;
vgapages.base=VGA_PAGE_B8;
vgapages.mask=0x7fff;
MEM_SetPageHandler(VGA_PAGE_B8,8,range_handler);
MEM_SetPageHandler(VGA_PAGE_A0,16,&vgaph.hram);
MEM_SetPageHandler(VGA_PAGE_B0,8,&vgaph.hram);
MEM_ResetPageHandler(VGA_PAGE_A0,16);
MEM_ResetPageHandler(VGA_PAGE_B0,8);
break;
}