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vmx: clean up mksegment, memset only if segment existed (devsegment clears new ones)

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Sigrid 2020-12-10 12:19:45 +01:00
parent d7120ecb77
commit f5d1fce9b5
1 changed files with 7 additions and 11 deletions
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18
sys/src/cmd/vmx/vmx.c
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@ -320,9 +320,6 @@ gend(void *v)
return (u8int *) v + gavail(v);
}
void *tmp, *vgamem;
uvlong tmpoff, vgamemoff;
static void
mksegment(char *sn)
{
@ -355,8 +352,9 @@ mksegment(char *sn)
close(fd);
gmem = segattach(0, sn, nil, sz);
if(gmem == (void*)-1) sysfatal("segattach: %r");
}else{
memset(gmem, 0, sz > 1<<24 ? 1<<24 : sz);
}
memset(gmem, 0, sz > 1<<24 ? 1<<24 : sz);
p = gmem;
for(r = mmap; r != nil; r = r->next){
if(r->segname == nil) continue;
@ -365,14 +363,12 @@ mksegment(char *sn)
p += r->end - r->start;
r->ve = p;
}
vgamem = p;
vgamemoff = p - gmem;
regptr(0xa0000)->segoff = vgamemoff;
regptr(0xa0000)->v = vgamem;
/* vga */
r = regptr(0xa0000);
r->segoff = p - gmem;
r->v = p;
p += 256*1024;
regptr(0xa0000)->ve = p;
tmp = p;
tmpoff = p - gmem;
r->ve = p;
for(r = mmap; r != nil; r = r->next)
modregion(r);