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added some safety checks

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cebix 2002-04-25 13:14:11 +00:00
parent 8871da753d
commit 72bb930435
1 changed files with 12 additions and 4 deletions
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16
BasiliskII/src/video.cpp
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@ -416,10 +416,18 @@ void monitor_desc::switch_mode(vector<video_mode>::const_iterator it, uint32 par
WriteMacInt32(0x824, mac_frame_base); // ScrnBase
WriteMacInt32(0x898, mac_frame_base); // CrsrBase
uint32 gdev = ReadMacInt32(0x8a4); // MainDevice
gdev = ReadMacInt32(gdev);
uint32 pmap = ReadMacInt32(gdev + 0x16); // gdPMap
pmap = ReadMacInt32(pmap);
WriteMacInt32(pmap, mac_frame_base); // baseAddr
D(bug("MainDevice handle at %08lx\n", gdev));
if (gdev != 0 && gdev != 0xffffffff) {
gdev = ReadMacInt32(gdev);
D(bug(" pointer at %08lx\n", gdev));
uint32 pmap = ReadMacInt32(gdev + 0x16); // gdPMap
D(bug(" PixMap handle at %08lx\n", pmap));
pmap = ReadMacInt32(pmap);
D(bug(" pointer at %08lx\n", pmap));
WriteMacInt32(pmap, mac_frame_base); // baseAddr
}
gdev = ReadMacInt32(0xcc8); // TheGDevice
D(bug("TheGDevice handle at %08lx\n", gdev));
}
}