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pc64: fix ulongs for address of devarchs realmodemem file

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This commit is contained in:
cinap_lenrek 2014-05-26 00:45:10 +02:00
parent 15fc6c1cc0
commit 3dc82dc04b
1 changed files with 10 additions and 8 deletions
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18
sys/src/9/pc/devarch.c
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@ -1010,20 +1010,22 @@ archctlwrite(Chan*, void *a, long n, vlong)
static long
rmemrw(int isr, void *a, long n, vlong off)
{
uintptr addr = off;
if(off < 0 || n < 0)
error("bad offset/count");
if(isr){
if(off >= MB)
if(addr >= MB)
return 0;
if(off+n >= MB)
n = MB - off;
memmove(a, KADDR((ulong)off), n);
if(addr+n >= MB)
n = MB - addr;
memmove(a, KADDR(addr), n);
}else{
/* allow vga framebuf's access */
if(off >= MB || off+n > MB ||
(off < 0xA0000 || off+n > 0xB0000+0x10000))
/* allow vga framebuf's write access */
if(addr >= MB || addr+n > MB ||
(addr < 0xA0000 || addr+n > 0xB0000+0x10000))
error("bad offset/count in write");
memmove(KADDR((ulong)off), a, n);
memmove(KADDR(addr), a, n);
}
return n;
}