diff options
| author | H. Peter Anvin <hpa@zytor.com> | 2008-01-30 13:33:02 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:33:02 +0100 |
| commit | 88089519f302f1296b4739be45699f06f728ec31 (patch) | |
| tree | a0ffb023be68d0b83503e77ba4a9d9b43acea88b /arch/x86/boot/pmjump.S | |
| parent | c4d9ba6da9f050ebb7e0d70769e3dca0fd45334f (diff) | |
x86 setup: initialize LDTR and TR to make life easier to Intel VT
Intel VT doesn't like to engage when the protected-mode state isn't
fully initialized. Make life easier for it by initializing LDTR (to
null) and TR (to a dummy hunk of low memory which will never actually
be touched.)
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/boot/pmjump.S')
| -rw-r--r-- | arch/x86/boot/pmjump.S | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/boot/pmjump.S b/arch/x86/boot/pmjump.S index ef0da1f2c7fd..f7153d0d476e 100644 --- a/arch/x86/boot/pmjump.S +++ b/arch/x86/boot/pmjump.S @@ -36,6 +36,7 @@ protected_mode_jump: addl %ebx, 2f movw $__BOOT_DS, %cx + movw $__BOOT_TSS, %di movl %cr0, %edx orb $1, %dl # Protected mode (PE) bit @@ -63,6 +64,9 @@ in_pm32: # a valid stack if some debugging hack wants to use it. addl %ebx, %esp + # Set up TR to make Intel VT happy + ltr %di + # Clear registers to allow for future extensions to the # 32-bit boot protocol xorl %ecx, %ecx @@ -71,6 +75,9 @@ in_pm32: xorl %ebp, %ebp xorl %edi, %edi + # Set up LDTR to make Intel VT happy + lldt %cx + jmpl *%eax # Jump to the 32-bit entrypoint .size in_pm32, .-in_pm32 |