Mirrors/libhermit
1
0
Fork 0
mirror of https://github.com/hermitcore/libhermit.git synced 2025-03-16 00:00:06 +01:00
Code Issues Releases Wiki Activity

enable PGE and PAE, remove label Linvalid

Browse source
This commit is contained in:
Stefan Lankes 2015-07-08 08:12:13 +02:00
parent 8ec49a3582
commit 51927e7e6d
1 changed files with 8 additions and 9 deletions

13
hermit/arch/x86/kernel/entry.asm
View file

@ -269,19 +269,19 @@ Lno_remap:
push ecx
popfd
xor eax, ecx
jz short Linvalid
jz $ ; there is no long mode
; cpuid > 0x80000000?
mov eax, 0x80000000
cpuid
cmp eax, 0x80000001
jb short Linvalid ; It is less, there is no long mode.
jb $ ; It is less, there is no long mode.
; do we have a long mode?
mov eax, 0x80000001
cpuid
test edx, 1 << 29 ; Test if the LM-bit, which is bit 29, is set in the D-register.
jz short Linvalid ; They aren't, there is no long mode.
jz $ ; They aren't, there is no long mode.
; we need to enable PAE modus
@ -299,12 +299,15 @@ Lno_remap:
mov eax, boot_pml4
sub eax, kernel_start
add eax, ebp
or eax, (1 << 0) ; set present bit
mov cr3, eax
; Set CR4
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
@ -318,10 +321,6 @@ Lno_remap:
lgdt [GDT64.Pointer] ; Load the 64-bit global descriptor table.
jmp GDT64.Code:start64 ; Set the code segment and enter 64-bit long mode.
; there is no long mode
Linvalid:
jmp $
[BITS 64]
start64:
; initialize segment registers