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

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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
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10
sys/src/9/pc/memory.c
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@ -383,7 +383,15 @@ e820scan(void)
}
}
/* RAM needs to be writeback */
/*
* 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)){