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don't set_mtrr if only fixed MTRRs exist; fixes triple fault in VirtualBox on some CPUs

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git-svn-id: svn://kolibrios.org@6721 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
CleverMouse 2016-11-16 18:24:32 +00:00
parent 40fcec8ed7
commit eb8c20f6c5
1 changed files with 5 additions and 4 deletions
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9
kernel/trunk/core/mtrr.inc
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@ -764,6 +764,10 @@ proc set_mtrr stdcall, base:dword,size:dword,mem_type:dword
; find unused register ; find unused register
mov ecx, 0x201 mov ecx, 0x201
.scan: .scan:
mov eax, [num_variable_mtrrs]
lea eax, [0x200+eax*2]
cmp ecx, eax
jae .ret
rdmsr rdmsr
dec ecx dec ecx
test ah, 8 test ah, 8
@ -776,10 +780,7 @@ proc set_mtrr stdcall, base:dword,size:dword,mem_type:dword
jz .ret jz .ret
@@: @@:
add ecx, 3 add ecx, 3
mov eax, [num_variable_mtrrs] jmp .scan
lea eax, [0x200+eax*2]
cmp ecx, eax
jb .scan
; no free registers, ignore the call ; no free registers, ignore the call
.ret: .ret:
ret ret