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| author | Jarkko Sakkinen <jarkko.sakkinen@intel.com> | 2012-05-08 21:22:46 +0300 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2012-05-08 15:04:27 -0700 |
| commit | cda846f101fb1396b6924f1d9b68ac3d42de5403 (patch) | |
| tree | 1fa8716c308b8e10156a1caf51d8ff6c98eceea9 /arch/x86/kernel/setup.c | |
| parent | bf8b88e97716feb750c3d34492f00d9c085e1183 (diff) | |
| download | linux-cda846f101fb1396b6924f1d9b68ac3d42de5403.tar.gz linux-cda846f101fb1396b6924f1d9b68ac3d42de5403.tar.xz linux-cda846f101fb1396b6924f1d9b68ac3d42de5403.zip | |
x86, realmode: read cr4 and EFER from kernel for 64-bit trampoline
This patch changes 64-bit trampoline so that CR4 and
EFER are provided by the kernel instead of using fixed
values.
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@intel.com>
Link: http://lkml.kernel.org/r/1336501366-28617-24-git-send-email-jarkko.sakkinen@intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/kernel/setup.c')
| -rw-r--r-- | arch/x86/kernel/setup.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index 7a14fece9cfc..efcf305210a4 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -975,6 +975,8 @@ void __init setup_arch(char **cmdline_p) if (boot_cpu_data.cpuid_level >= 0) { /* A CPU has %cr4 if and only if it has CPUID */ mmu_cr4_features = read_cr4(); + if (trampoline_cr4_features) + *trampoline_cr4_features = mmu_cr4_features; } #ifdef CONFIG_X86_32 |