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clear NW bit in CR0 because it is not allowed in long mode

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This commit is contained in:
Stefan Lankes 2015-07-08 20:08:53 +02:00
parent 4c2244680d
commit bfd302c655
1 changed files with 3 additions and 5 deletions
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8
hermit/arch/x86/kernel/entry.asm
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@ -302,20 +302,18 @@ Lno_remap:
or eax, (1 << 0) ; set present bit
mov cr3, eax
; Set CR4
; Set CR4 (PAE is already set)
mov eax, cr4
and eax, 0xfffbf9ff ; disable SSE
or eax, (1 << 4) ; enable PSE
or eax, (1 << 5) ; enable PAE
or eax, (1 << 7) ; enable PGE
mov cr4, eax
; Set CR0
; Set CR0 (PM-bit is already set)
mov eax, cr0
and eax, ~(1 << 30) ; enable caching
and eax, ~(1 << 29) ; disable write through caching
and eax, ~(1 << 16) ; allow kernel write access to read-only pages
or eax, (1 << 31) ; enable paging
or eax, (1 << 0) ; long mode also needs PM-bit set
mov cr0, eax
lgdt [GDT64.Pointer] ; Load the 64-bit global descriptor table.