xfnw/plan9fox
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity

pc, pc64: work around bhyve all uncached MTRR's

Browse source
This commit is contained in:
cinap_lenrek 2020-12-10 01:47:19 +01:00
parent 635be84831
commit cef91f23e7
1 changed files with 10 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
sys/src/9/pc/memory.c
View file

@ -383,8 +383,16 @@ e820scan(void)
}
}
/* RAM needs to be writeback */
mtrrexclude(MemRAM, "wb");
/*
* Make sure RAM is set to writeback,
* but do a sanity check first checking
* that the kernel text is writeback.
* This is needed as some emulators (bhyve)
* set everything to uncached.
*/
s = mtrrattr(PADDR(KTZERO), nil);
if(s != nil && strcmp(s, "wb") == 0)
mtrrexclude(MemRAM, "wb");
for(base = memmapnext(-1, MemRAM); base != -1; base = memmapnext(base, MemRAM)){
size = memmapsize(base, BY2PG) & ~(BY2PG-1);