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Enable support for the no-execute (NX) bit

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Achilleas Anagnostopoulos 2017-06-14 17:22:31 +01:00
parent 886c7b10fa
commit 1b88764676
1 changed files with 3 additions and 2 deletions
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arch/x86_64/asm/rt0_32.s
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@ -297,10 +297,11 @@ _rt0_enter_long_mode:
or eax, 1 << 5 or eax, 1 << 5
mov cr4, eax mov cr4, eax
; Now enable long mode by modifying the EFER MSR ; Now enable long mode (bit 8) and the no-execute support (bit 11) by
; modifying the EFER MSR
mov ecx, 0xc0000080 mov ecx, 0xc0000080
rdmsr ; read msr value to eax rdmsr ; read msr value to eax
or eax, 1 << 8 or eax, (1 << 8) | (1<<11)
wrmsr wrmsr
; Finally enable paging ; Finally enable paging