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Disable paging whilst updating the pdbr during restart.

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This commit is contained in:
Martin Whitaker
2020-05-30 10:52:35 +01:00
parent 808cd46582
commit dc74849f50
1 changed files with 7 additions and 1 deletions
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boot/startup32.S
+7 -1
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@@ -127,6 +127,12 @@ flush: movw $KERNEL_DS, %ax
call reloc
# Disable paging (needed during restart).
movl %cr0, %eax
andl $0x7fffffff, %eax
movl %eax, %cr0
# Enable PAE if supported.
movl %ebx, %edi # ebx is overwritten by cpuid
@@ -155,7 +161,7 @@ flush: movw $KERNEL_DS, %ax
andl $0x20000000, %edx
jz 0f # bail if not supported
movl $0xc0000080, %ecx # enable long mode.
movl $0xc0000080, %ecx # enable long mode
rdmsr
orl $0x00000100, %eax
wrmsr